Amiga ISO Collection/AmigaUtilCD2.iso/Programming/Misc/TRSICAT.LZX/CATS_CD2_TRSI/Inc&AD2.1/Text_Autodocs/intuition.doc

Text File | 1992-09-11 | 230.7 KB | 6,635 lines

TABLE OF CONTENTS

intuition.library/ActivateGadget
intuition.library/ActivateWindow
intuition.library/AddClass
intuition.library/AddGadget
intuition.library/AddGList
intuition.library/AllocRemember
intuition.library/AutoRequest
intuition.library/BeginRefresh
intuition.library/BuildEasyRequestArgs
intuition.library/BuildSysRequest
intuition.library/ChangeWindowBox
intuition.library/ClearDMRequest
intuition.library/ClearMenuStrip
intuition.library/ClearPointer
intuition.library/CloseScreen
intuition.library/CloseWindow
intuition.library/CloseWorkBench
intuition.library/CurrentTime
intuition.library/DisplayAlert
intuition.library/DisplayBeep
intuition.library/DisposeObject
intuition.library/DoubleClick
intuition.library/DrawBorder
intuition.library/DrawImage
intuition.library/DrawImageState
intuition.library/EasyRequestArgs
intuition.library/EndRefresh
intuition.library/EndRequest
intuition.library/EraseImage
intuition.library/FreeClass
intuition.library/FreeRemember
intuition.library/FreeScreenDrawInfo
intuition.library/FreeSysRequest
intuition.library/GadgetMouse
intuition.library/GetAttr
intuition.library/GetDefaultPubScreen
intuition.library/GetDefPrefs
intuition.library/GetPrefs
intuition.library/GetScreenData
intuition.library/GetScreenDrawInfo
intuition.library/InitRequester
intuition.library/IntuiTextLength
intuition.library/ItemAddress
intuition.library/LockIBase
intuition.library/LockPubScreen
intuition.library/LockPubScreenList
intuition.library/MakeClass
intuition.library/MakeScreen
intuition.library/ModifyIDCMP
intuition.library/ModifyProp
intuition.library/MoveScreen
intuition.library/MoveWindow
intuition.library/MoveWindowInFrontOf
intuition.library/NewModifyProp
intuition.library/NewObject
intuition.library/NextObject
intuition.library/NextPubScreen
intuition.library/ObtainGIRPort
intuition.library/OffGadget
intuition.library/OffMenu
intuition.library/OnGadget
intuition.library/OnMenu
intuition.library/OpenScreen
intuition.library/OpenScreenTagList
intuition.library/OpenWindow
intuition.library/OpenWindowTagList
intuition.library/OpenWorkBench
intuition.library/PointInImage
intuition.library/PrintIText
intuition.library/PubScreenStatus
intuition.library/QueryOverscan
intuition.library/RefreshGadgets
intuition.library/RefreshGList
intuition.library/RefreshWindowFrame
intuition.library/ReleaseGIRPort
intuition.library/RemakeDisplay
intuition.library/RemoveClass
intuition.library/RemoveGadget
intuition.library/RemoveGList
intuition.library/ReportMouse
intuition.library/Request
intuition.library/ResetMenuStrip
intuition.library/RethinkDisplay
intuition.library/ScreenToBack
intuition.library/ScreenToFront
intuition.library/SetAttrsA
intuition.library/SetDefaultPubScreen
intuition.library/SetDMRequest
intuition.library/SetEditHook
intuition.library/SetGadgetAttrsA
intuition.library/SetMenuStrip
intuition.library/SetMouseQueue
intuition.library/SetPointer
intuition.library/SetPrefs
intuition.library/SetPubScreenModes
intuition.library/SetWindowTitles
intuition.library/ShowTitle
intuition.library/SizeWindow
intuition.library/SysReqHandler
intuition.library/UnlockIBase
intuition.library/UnlockPubScreen
intuition.library/UnlockPubScreenList
intuition.library/ViewAddress
intuition.library/ViewPortAddress
intuition.library/WBenchToBack
intuition.library/WBenchToFront
intuition.library/WindowLimits
intuition.library/WindowToBack
intuition.library/WindowToFront
intuition.library/ZipWindow
intuition.library/ActivateGadget             intuition.library/ActivateGadget

    NAME
    ActivateGadget -- Activate a (string or custom) gadget.

    SYNOPSIS
    Success = ActivateGadget( Gadget, Window, Request )
    D0              A0      A1      A2

    BOOL ActivateGadget( struct Gadget *, struct Window *,
        struct Requester * );

    FUNCTION
    Activates a string or custom gadget.  If successful, this means
    that the user does not need to click in the gadget before typing.

    The window parameter must point to the window which contains the gadget.
    If the gadget is actually in a requester, the window must contain
    the requester, and a pointer to the requester must also be
    passed.    The requester parameter must only be valid if the gadget
    has the    GTYP_REQGADGET flag set, a requirement for all requester
    gadgets.

    The success of this function depends on a rather complex set
    of conditions.  The intent is that the user is never interrupted from
    what interactions he may have underway.

    The current set of conditions includes:
    -   The window must be active.  If you are opening a new window
        and want an active gadget in it, it is not sufficient to
        assume that the WFLG_ACTIVATE flag has taken effect by the time
        OpenWindow() returns, even if you insert a delay of some
        finite amount of time.  Use the IDCMP_ACTIVEWINDOW IntuiMessage
        to tell when your window really becomes active.  Many
        programs use an event loop that calls ActivateGadget()
        whenever they receive the IDCMP_ACTIVEWINDOW message, and also
        the IDCMP_MOUSEBUTTONS messages, and so on, to keep the
        gadget active until it is used (or the user selects some
        other "Cancel" gadget).

    -   No other gadgets may be in use.  This includes system gadgets,
        such as those for window sizing, dragging, etc.
    -   If the gadget is in a requester, that requester must
        be active. (Use IDCMP_REQSET and IDCMP_REQCLEAR).
    -   The right mouse button cannot be held down (e.g. menus)

    NOTE: Don't try to activate a gadget which is disabled or
    not attached to a window or requester.

    INPUTS
    Gadget = pointer to the gadget that you want activated.
    Window = pointer to a window structure containing the gadget.
    Requester = pointer to a requester (may by NULL if this isn't
           a requester gadget (i.e. GTYP_REQGADGET is not set)).

    RESULT
    If the conditions above are met, and the gadget is in fact a string
    gadget, then this function will return TRUE, else FALSE.

    BUGS
    At present, this function will not return FALSE if a custom
    gadget declines to be activated.

    SEE ALSO

intuition.library/ActivateWindow             intuition.library/ActivateWindow

    NAME
    ActivateWindow -- Activate an Intuition window.

    SYNOPSIS
    [success =] ActivateWindow( Window )
    [D0]                        A0

    [LONG] ActivateWindow( struct Window * );
    /* returns LONG in V36 and higher */

    FUNCTION
    Activates an Intuition window.

    Note that this call may have its action deferred: you cannot assume
    that when this call is made the selected window has become active.
    This action will be postponed while the user plays with gadgets and
    menus, or sizes and drags windows.  You may detect when the window
    actually has become active by the IDCMP_ACTIVEWINDOW IDCMP message.

    This call is intended to provide flexibility but not to confuse the
    user.  Please call this function synchronously with some action
    by the user.

    INPUTS
    Window = a pointer to a Window structure

    RESULT
    V35 and before: None.
    V36 and later: returns zero if no problem queuing up
        the request for deferred action

    BUGS
    Calling this function in a tight loop can blow out Intuition's deferred
    action queue.

    SEE ALSO
    OpenWindow(), and the WFLG_ACTIVATE window flag
intuition.library/AddClass                         intuition.library/AddClass

    NAME
    AddClass -- Make a public class available (V36)

    SYNOPSIS
    AddClass( Class )
              A0

    VOID AddClass( struct IClass * );

    FUNCTION
    Adds a public boopsi class to the internal list of classes available
    for public consumption.

    You must call this function after you call MakeClass().

    INPUTS
    Class = pointer returned by MakeClass()

    RESULT
    Nothing returned.

    NOTES

    BUGS
    Although there is some protection against creating classes
    with the same name as an existing class, this function
    does not do any checking or other dealings with like-named
    classes.  Until this is rectified, only officially registered
    names can be used for public classes, and there is no
    "class replacement" policy in effect.

    SEE ALSO
    MakeClass(), FreeClass(), RemoveClass()
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.
intuition.library/AddGadget                       intuition.library/AddGadget

    NAME
    AddGadget -- Add a gadget to the gadget list of a window.

    SYNOPSIS
    RealPosition = AddGadget( Window, Gadget, Position )
    D0              A0      A1      D0

    UWORD  AddGadget( struct Window *, struct Gadget *, UWORD );

    FUNCTION
    Adds the specified gadget to the gadget list of the given window,
    linked in at the position in the list specified by the position
    argument (that is, if Position == 0, the gadget will be inserted
    at the head of the list, and if Position == 1 then the gadget will
    be inserted after the first gadget and before the second).  If the
    position you specify is greater than the number of gadgets in the
    list, your gadget will be added to the end of the list.

    Calling AddGadget() does not cause your gadget to be redisplayed.
    The benefit of this is that you may add several gadgets without
    having the gadget list redrawn every time.

    This procedure returns the position at which your gadget was added.

    NOTE:  A relatively safe way to add the gadget to the end of the
    list is to specify a position of -1 (i.e., (UWORD) ~0).  That way,
    only the 65536th (and multiples of it) will be inserted at the wrong
    position.  The return value of the procedure will tell you where it was
    actually inserted.

    NOTE:  The system window gadgets are initially added to the
    front of the gadget list.  The reason for this is:  If you position
    your own gadgets in some way that interferes with the graphical
    representation of the system gadgets, the system's ones will be "hit"
    first by user.  If you then start adding gadgets to the front of the
    list, you will disturb this plan, so beware.  On the other hand, if
    you don't violate the design rule of never overlapping your gadgets,
    there's no problem.

    NOTE:  You may not add your own gadgets to a screen.  Gadgets may
    be added to backdrop windows, however, which can be visually similar,
    but also provide an IDCMP channel for gadget input messages.

    INPUTS
    Window = pointer to the window to get your gadget
    Gadget = pointer to the new gadget
    Position = integer position in the list for the new gadget (starting
        from zero as the first position in the list)

    RESULT
    Returns the position of where the gadget was actually added.

    BUGS

    SEE ALSO
    AddGList(), RemoveGadget(), RemoveGList()
intuition.library/AddGList                         intuition.library/AddGList

    NAME
    AddGList -- Add a linked list of gadgets to a window or requester.

    SYNOPSIS
    RealPosition = AddGList( Window, Gadget, Position, Numgad, Requester )
    D0                       A0      A1      D0        D1      A2

    UWORD AddGList( struct Window *, struct Gadget *, UWORD, WORD,
        struct Requester * );

    FUNCTION
    Adds the list of gadgets to the gadget list of the given window
    or requester linked in at the position in the list specified by
    the position argument.

    See AddGadget() for more information about gadget list position,
    and more information about gadgets in general.

    The requester parameter will be ignored unless the GTYP_REQGADGET
    bit is set in the GadgetType field of the first gadget in the list.
    In that case, the gadget list is added to the requester gadgets.
    NOTE: be sure that GTYP_REQGADGET is either set or cleared consistently
    for all gadgets in the list.  NOTE ALSO: The window parameter
    should point to the window that the requester (will) appear in.

    Will add 'Numgad' gadgets from gadget list linked by the field
    NextGadget, or until some NextGadget field is found to be NULL.  Does
    not assume that the Numgad'th gadget has NextGadget equal to NULL.

    NOTE WELL: In order to link your gadget list in, the NextGadget
    field of the Numgad'th (or last) gadget will be modified.  Thus, if
    you are adding the first 3 gadgets from a linked list of five gadgets,
    this call will sever the connection between your third and fourth
    gadgets.

    INPUTS
    Window = pointer to the window to get your gadget
    Gadget = pointer to the first gadget to be added
    Position = integer position in the list for the new gadget
        (starting from zero as the first position in the list)
    Numgad = the number of gadgets from the linked list to be added
        if Numgad equals -1, the entire null-terminated list of
        gadgets will be added.
    Requester = the requester the gadgets will be added to if the
        GTYP_REQGADGET GadgetType flag is set for the first gadget
        in the list

    RESULT
    Returns the position of where the first gadget in the list was actually
    added.

    BUGS

    SEE ALSO
    AddGadget(), RemoveGadget(), RemoveGList()
intuition.library/AllocRemember               intuition.library/AllocRemember

    NAME
    AllocRemember -- AllocMem() with tracking to make freeing easy.

    SYNOPSIS
    MemBlock = AllocRemember( RememberKey, Size, Flags )
    D0              A0           D0    D1

    APTR AllocRemember( struct Remember **, ULONG, ULONG );

    FUNCTION
    This routine calls the Exec AllocMem() function for you, but also links
    the parameters of the allocation into a master list, so that
    you can simply call the Intuition routine FreeRemember() at a later
    time to deallocate all allocated memory without being required to
    remember the details of the memory you've allocated.

    This routine will have two primary uses:
       -   Let's say that you're doing a long series of allocations in a
           procedure.  If any one of the allocations fails, your program
        may need to abort the procedure.  Abandoning ship correctly
        involves freeing up what memory you've already allocated.  This
        procedure allows you to free up that memory easily, without being
        required to keep track of how many allocations you've already done,
        what the sizes of the allocations were, or where the memory was
        allocated.

       -   Also, in the more general case, you may do all of the allocations
           in your entire program using this routine.  Then, when your
           program is exiting, you can free it all up at once with a
           simple call to FreeRemember().

    You create the "anchor" for the allocation master list by creating
    a variable that's a pointer to struct Remember, and initializing
    that pointer to NULL.  This is called the RememberKey.  Whenever
    you call AllocRemember(), the routine actually does two memory
    allocations, one for the memory you want and the other for a copy
    of a Remember structure.  The Remember structure is filled in
    with data describing your memory allocation, and it's linked
    into the master list pointed to by your RememberKey.  Then, to
    free up any memory that's been allocated, all you have to do is
    call FreeRemember() with your RememberKey.

    Please read the FreeRemember() function description, too.  As you will
    see, you can select either to free just the link nodes and keep all the
    allocated memory for yourself, or to free both the nodes and your memory
    buffers.


    INPUTS
    RememberKey = the address of a pointer to struct Remember.  Before the
    very first call to AllocRemember, initialize this pointer to NULL.

    Size = the size in bytes of the memory allocation.  Please refer to the
        exec.library/AllocMem() function for details.
    Flags = the specifications for the memory allocation.  Please refer to
        the exec.library/AllocMem() function for details.

    EXAMPLE
    struct Remember *RememberKey;
    RememberKey = NULL;
    buffer = AllocRemember(&RememberKey, BUFSIZE, MEMF_CHIP);
    if (buffer)
    {
        /* Use the buffer */
        ...
    }
    FreeRemember(&RememberKey, TRUE);

    RESULT
    If the memory allocation is successful, this routine returns the byte
    address of your requested memory block.  Also, the node to your block
    will be linked into the list pointed to by your RememberKey variable.
    If the allocation fails, this routine returns NULL and the list pointed
    to by RememberKey, if any, will be unchanged.

    BUGS
    This function makes two allocations for each memory buffer
    you request.  This is neither fast nor good for memory
    fragmentation.

    This function should use the exec AllocPool() function internally,
    at least for the Remember headers.

    SEE ALSO
    FreeRemember(), exec.library/AllocMem()
intuition.library/AutoRequest                   intuition.library/AutoRequest

    NAME
    AutoRequest -- Automatically build and get response from a requester.

    SYNOPSIS
    Response = AutoRequest( Window, BodyText, PosText, NegText,
    D0                      A0      A1        A2       A3
            PosFlags, NegFlags, Width, Height )
            D0        D1        D2     D3

    BOOL AutoRequest( struct Window *, struct IntuiText *,
        struct IntuiText *, struct IntuiText *, WORD, WORD );

    FUNCTION
    This procedure automatically builds a requester for you and then
    waits for a response from the user, or for the system to satisfy your
    request.  If the response is positive, this procedure returns TRUE.
    If the response is negative, this procedure returns FALSE.

    An IDCMPFlag specification is created by bitwise "or'ing" your
    PosFlags, NegFlags, and the IDCMP classes IDCMP_GADGETUP and
    IDCMP_RAWKEY.  You may specify zero flags for either the PosFlags
    or NegFlags arguments.

    The IntuiText arguments, and the width and height values, are
    passed directly to the BuildSysRequest() procedure along with
    your window pointer and the IDCMP flags.  Please refer to
    BuildSysRequest() for a description of the IntuiText that you are
    expected to supply when calling this routine.  It's an important
    but long-winded description that need not be duplicated here.

    If the BuildSysRequest() procedure does not return a pointer
    to a window, it will return TRUE or FALSE (not valid structure
    pointers) instead, and these BOOL values will be returned to
    you immediately.

    On the other hand, if a valid window pointer is returned, that
    window will have had its IDCMP ports and flags initialized according
    to your specifications.  AutoRequest() then waits for IDCMP messages
    on the UserPort, which satisfies one of four requirements:
    -   either the message is of a class that matches
        one of your PosFlags arguments (if you've supplied
        any), in which case this routine returns TRUE.  Or
    -   the message class matches one of your NegFlags
        arguments (if you've supplied any), in which case
        this routine returns FALSE.  Or
    -   the IDCMP message is of class IDCMP_GADGETUP, which means that
        one of the two gadgets, as provided with the PosText and NegText
        arguments, was selected by the user.  If the TRUE gadget
        was selected, TRUE is returned.  If the FALSE gadget was
        selected, FALSE is returned.
    -   Lastly, two IDCMP_RAWKEY messages may satisfy the request: those
        for the V and B keys with the left Amiga key depressed.
        These keys, satisfy the gadgets on the left or right side of
        the requester--TRUE or FALSE--, respectively.

        NOTE: For V36, these two keys left-Amiga-B and V are processed
        through the default keymap.

    When the dust has settled, this routine calls FreeSysRequest() if
    necessary to clean up the requester and any other allocated memory.

    NOTE: For V36, this function now switches the processor stack
    to ensure sufficient stack space for the function to succeed.

    INPUTS
    Window = pointer to a Window structure.  See BuildSysRequest()
        for a full discussion.
    BodyText = pointer to an IntuiText structure
    PosText = pointer to an IntuiText structure, may by NULL.
    NegText = pointer to an IntuiText structure, MUST be valid!
    PosFlags = flags for the IDCMP
    NegFlags = flags for the IDCMP
    Width, Height = the sizes to be used for the rendering of the requester

    NOTE for V36: The width and height parameters are ignored, as
    are several other specifications in the IntuiText, to make
    AutoRequest() requesters retroactively conform to the new look
    designed for EasyRequest().

    RESULT
    The return value is either TRUE or FALSE.  See the text above for a
    complete description of the chain of events that might lead to either
    of these values being returned.

    BUGS
    The requester no longer devolves into a call to DisplayAlert()
    if there is not enough memory for the requester.

    SEE ALSO
    EasyRequest(), BuildSysRequest(), SysReqHandler()
intuition.library/BeginRefresh                 intuition.library/BeginRefresh

    NAME
    BeginRefresh -- Sets up a window for optimized refreshing.

    SYNOPSIS
    BeginRefresh( Window )
              A0

    VOID BeginRefresh( struct Window * );

    FUNCTION
    This routine sets up your window for optimized refreshing.

    Its role is to provide Intuition integrated access to the Layers
    library function BeginUpdate().  Its additional contribution is
    to be sure that locking protocols for layers are followed, by
    locking both layers of a WFLG_GIMMEZEROZERO window only after the
    parent Layer_Info has been locked.  Also, the WFLG_WINDOWREFRESH
    flag is set in your window, for your information.

    The purpose of BeginUpdate(), and hence BeginRefresh(), is to
    restrict rendering in a window (layer) to the region that needs
    refreshing after an operation such as window sizing or uncovering.
    This restriction to the "damage region" persists until you call
    EndRefresh().

    For instance, if you have a WFLG_SIMPLE_REFRESH window which is
    partially concealed and the user brings it to the front, you can
    receive an IDCMP_REFRESHWINDOW message asking you to refresh your
    display.  If you call BeginRefresh() before doing any of the
    rendering, then the layer that underlies your window will be arranged
    so that the only rendering that will actually take place will be that
    which goes to the newly-revealed areas.  This is very performance-
    efficient, and visually attractive.

    After you have performed your refresh of the display, you should call
    EndRefresh() to reset the state of the layer and the window.  Then you
    may proceed with rendering to the entire window as usual.

    You learn that your window needs refreshing by receiving either a
    message of class IDCMP_REFRESHWINDOW through the IDCMP, or an input
    event of class IECLASS_REFRESHWINDOW through the Console device.
    Whenever you are told that your window needs refreshing, you should
    call BeginRefresh() and EndRefresh() to clear the refresh-needed
    state, even if you don't plan on doing any rendering.  You may relieve
    yourself of even this burden by setting the WFLG_NOCAREREFRESH flag
    when opening your window.

    WARNING: You should only perform graphics refreshing operations
    during the period between calling BeginRefresh() and EndRefresh().
    In particular, do not call RefreshGadgets() or RefreshGList(), since
    the locking protocol internal to Intuition runs the risk of creating
    a deadlock.  Note that Intuition refreshes the gadgets (through
    the damage region) before it sends the IDCMP_REFRESHWINDOW message.

    ANOTHER WARNING: The concept of multiple refresh passes using
    EndRefresh( w, FALSE ) is not completely sound without further
    protection.  The reason is that between two sessions, more
    damage can occur to your window.  Your final EndRefresh( w, TRUE )
    will dispose of all damage, including the new, and your
    initial refreshing pass will never get the chance to refresh
    the new damage.

    To avoid this, you must protect your session using LockLayerInfo()
    which will prevent Intuition from performing window operations
    or anything else which might cause further damage from occurring.
    Again, while holding the LayerInfo lock make no Intuition
    function calls dealing with gadgets; just render.

    You can, however, call InstallClipRegion() for the different
    refresh passes, if you have two clip regions.

    SIMILAR WARNING: Your program and Intuition "share" your window
    layer's DamageList.  BeginRefresh() helps arbitrate this
    sharing, but the lower-level function layers.library/BeginUpdate()
    does not.  It isn't really supported to use BeginUpdate() on
    a window's layer, but if you do--for whatever reason--it is
    critical that you first acquire the LayerInfo lock as in
    the above example: even if you only have one pass of refresh
    rendering to do.  Otherwise, the refreshing of your window's
    borders and gadgets can be incomplete, and the problem might
    occur only under certain conditions of task priority and
    system load.

    EXAMPLE
    Code fragment for "two pass" window refreshing, in response
    to an IDCMP_REFRESHWINDOW message:
    switch ( imsg->Class )
    {
    ...
    case IDCMP_REFRESHWINDOW:
        window = imsg->IDCMPWindow;

        /* this lock only needed for "two-pass" refreshing */
        LockLayerInfo( &window->WScreen->LayerInfo );

        /* refresh pass for region 1 */
        origclip = InstallClipRegion( window->WLayer, region1 );
        BeginRefresh( window );
        myRefreshRegion1( window );
        EndRefresh( window, FALSE );

        /* refresh pass for region 2 */
        InstallClipRegion( window->WLayer, region2 );
        BeginRefresh( window );
        myRefreshRegion2( window );
        EndRefresh( window, TRUE );        /* and dispose damage list */

        /* restore and unlock */
        InstallClipRegion( window->WLayer, origclip );
        UnlockLayerInfo( &window->WScreen->LayerInfo );
        break;
    ...
    }


    INPUTS
    Window = pointer to the window structure which needs refreshing

    RESULT
    None

    BUGS
    This function should check the return code of
    layers.library/BeginUpdate(), and abort if that function fails.

    SEE ALSO
       EndRefresh(), layers.library/BeginUpdate(), OpenWindow()
    layer.library/InstallClipRegion(), graphics.library/LockLayerInfo()
    The "Windows" chapter of the Intuition Reference Manual
intuition.library/BuildEasyRequestArgs intuition.library/BuildEasyRequestArgs

    NAME
    BuildEasyRequestArgs -- Simple creation of system request. (V36)
    BuildEasyRequest -- Varargs stub for BuildEasyRequestArgs(). (V36)

    SYNOPSIS
    ReqWindow = BuildEasyRequestArgs( RefWindow, easyStruct, IDCMP, Args )
    D0                                A0         A1          D0     A3

    struct Window *BuildEasyRequestArgs( struct Window *,
        struct EasyStruct *, ULONG, APTR );

    ReqWindow = BuildEasyRequest( RefWindow, easyStruct, IDCMP, Arg1, ... )

    struct Window *BuildEasyRequest( struct Window *,
        struct EasyStruct *, ULONG, APTR, ... );

    FUNCTION
    This function is to EasyRequest() as BuildSysRequest() is to
    AutoRequest(): it returns a pointer to the system requester
    window.  The input from that window can then be processed
    under application control.

    It is recommended that this processing be done with
    SysReqHandler(), so that future enhancement to the
    processing will be enjoyed.

    After you have determined that the requester is satisfied or
    cancelled, you must free this requester using FreeSysRequest().

    Please see the autodoc for EasyRequest().

    NOTE: This function switches the processor stack to ensure
    sufficient stack space for the function to complete.

    INPUTS
    Window = reference window for requester: determines the
        requester window title and screen.
    easyStruct = pointer to EasyStruct structure, as described
        in the EasyRequest() autodocs.
    IDCMP = (NOT A POINTER) provided application specific IDCMP
        flags for the system requester window.
    Args = see EasyRequest()

    RESULT
    A pointer to the system request window opened.  In the event
    of problems, you may also be returned the value '0' which
    is to be interpreted as the "FALSE, Cancel" choice, or
    (if you have a second gadget defined) the value '1', which
    is to be taken to mean the equivalent of your corresponding
    left-most gadget.

    If there is a problem creating the window, a recoverable alert may
    be substituted for the requester, and the result, either 0 or 1,
    returned.

    BUGS
    Does not put up alternative alert.
    See also BUGS listed for EasyRequestArgs().

    SEE ALSO
    EasyRequestArgs(), FreeSysRequest(), SysReqHandler(),
    BuildSysRequest(), AutoRequest()
intuition.library/BuildSysRequest           intuition.library/BuildSysRequest

    NAME
    BuildSysRequest -- Build and display a system requester.

    SYNOPSIS
    ReqWindow = BuildSysRequest( Window, BodyText, PosText, NegText,
    D0                           A0      A1        A2       A3
                   IDCMPFlags, Width, Height )
               D0          D2     D3

    struct Window *BuildSysRequest( struct Window *, struct IntuiText *,
        struct IntuiText *, struct IntuiText *, ULONG, WORD, WORD );

    FUNCTION
    This procedure builds a system requester based on the supplied
    information.  If all goes well and the requester is constructed,
    this procedure returns a pointer to the window in which the requester
    appears.  That window will have its IDCMP initialized to reflect the
    flags found in the IDCMPFlags argument.  You may then wait on those
    ports to detect the user's response to your requester, which response
    may include either selecting one of the gadgets or causing some other
    event to be noticed by Intuition (like IDCMP_DISKINSERTED, for
    instance).  After the requester is satisfied, you should call the
    FreeSysRequest() procedure to remove the requester and free up
    any allocated memory.

    See the autodoc for SysReqHandler() for more information on the
    how to handle the IntuiMessages this window will receive.

    The requester used by this function has the NOISYREQ flag bit set,
    which means that the set of IDCMPFlags that may be used here
    include IDCMP_RAWKEY, IDCMP_MOUSEBUTTONS, and others.

    In release previous to V36, if the requester could not be built,
    this function would try to call DisplayAlert() with the same
    information, with more or less favorable results.  In V36,
    the requesters themselves require less memory (SIMPLEREQ), but
    there is no alert attempt.

    The function may return TRUE (1) or FALSE if it cannot post
    the requester.  (V36 will always return FALSE, but be sure to
    test for TRUE in case somebody reinstates the fallback alert.)

    If the window argument you supply is equal to NULL, a new window will
    be created for you in the Workbench screen, or the default
    public screen, for V36.  If you want the requester
    created by this routine to be bound to a particular window (i.e.,
    to appear in the same screen as the window), you should
    not supply a window argument of NULL.

    New for V36: if you pass a NULL window pointer, the system requester
    will appear on the default public screen, which is not always
    the Workbench.

    The text arguments are used to construct the display.  Each is a
    pointer to an instance of the structure IntuiText.

    The BodyText argument should be used to describe the nature of
    the requester.  As usual with IntuiText data, you may link several
    lines of text together, and the text may be placed in various
    locations in the requester.  This IntuiText pointer will be stored
    in the ReqText variable of the new requester.

    The PosText argument describes the text that you want associated
    with the user choice of "Yes,  TRUE,  Retry,  Good."  If the requester
    is successfully opened, this text will be rendered in a gadget in
    the lower-left of the requester, which gadget will have the
    GadgetID field set to TRUE.  If the requester cannot be opened and
    the DisplayAlert() mechanism is used, this text will be rendered in
    the lower-left corner of the alert display with additional text
    specifying that the left mouse button will select this choice.  This
    pointer can be set to NULL, which specifies that there is no TRUE
    choice that can be made.

    The NegText argument describes the text that you want associated
    with the user choice of "No,  FALSE,  Cancel,  Bad."  If the requester
    is successfully opened, this text will be rendered in a gadget in
    the lower-right of the requester, which gadget will have the
    GadgetID field set to FALSE.  If the requester cannot be opened and
    the DisplayAlert() mechanism is used, this text will be rendered in
    the lower-right corner of the alert display with additional text
    specifying that the right mouse button will select this choice.  This
    pointer cannot be set to NULL.  There must always be a way for the
    user to cancel this requester.

    The Positive and Negative Gadgets created by this routine have
    the following features:
          - GTYP_BOOLGADGET
          - GACT_RELVERIFY
          - GTYP_REQGADGET
          - GACT_TOGGLESELECT

    When defining the text for your gadgets, you may find it convenient
    to use the special constants used by Intuition for the construction
    of the gadgets.  These include defines like AUTODRAWMODE, AUTOLEFTEDGE,
    AUTOTOPEDGE and AUTOFRONTPEN.  You can find these in your local
    intuition.h (or intuition.i) file.

    These hard-coded constants are not very resolution or font
    sensitive, but V36 will override them to provide more modern
    layout.

    New for V36, linked lists of IntuiText are not correctly supported
    for gadget labels.

    The width and height values describe the size of the requester.  All
    of your BodyText must fit within the width and height of your
    requester.  The gadgets will be created to conform to your sizes.

    VERY IMPORTANT NOTE:  for this release of this procedure, a new window
    is opened in the same screen as the one containing your window.
    Future alternatives may be provided as a function distinct from this
    one.

    NOTE: This function will pop the screen the requester and its
    window appears in to the front of all screens.  New for V36,
    if the user doesn't perform any other screen arrangement before
    finishing with the requester, a popped screen will be pushed
    back behind.

    INPUTS
    Window = pointer to a Window structure
    BodyText = pointer to an IntuiText structure
    PosText = pointer to an IntuiText structure
    NegText = pointer to an IntuiText structure
    IDCMPFlags = the IDCMP flags you want used for the initialization of the
           IDCMP of the window containing this requester
    Width, Height = the size required to render your requester

    NOTE for V36: the width and height you pass are ignored, as
    are some of the parameters of your IntuiText, so that Intuition
    can make the Requesters real nice for the new look.

    RESULT
    If the requester was successfully created, the value
    returned by this procedure is a pointer to the window in which the
    requester is rendered.  If the requester could not be created,
    this routine might have called DisplayAlert() before returning
    (it depends on the version) and will pass back TRUE if the user
    pressed the left mouse button and FALSE if the user pressed the
    right mouse button.   If the version of Intuition doesn't
    call DisplayAlert(), or if it does, and there's not enough
    memory for the alert, the value of FALSE is returned.

    BUGS
    This procedure currently opens a window in the Screen which
    contains the window which is passed as a parameter, or the
    default public screen, if that parameter is NULL.  Although
    not as originally envisioned, this will probably always be the
    behavior of this function.

    DisplayAlert() is not called in version V36.

    It's almost impossible to make complete, correct account
    of different system fonts, window border dimensions, and
    screen resolution to get the layout of a System Requester
    just right using this routine.  For V36, we recommend the
    automatic layout implemented in BuildEasyRequest and EasyRequest.

    SEE ALSO
    FreeSysRequest(), DisplayAlert(), ModifyIDCMP(), exec.library/Wait(),
    Request(), AutoRequest(), EasyRequest(), BuildEasyRequestArgs()
intuition.library/ChangeWindowBox           intuition.library/ChangeWindowBox

    NAME
    ChangeWindowBox -- Change window position and dimensions. (V36)

    SYNOPSIS
    ChangeWindowBox( Window, Left, Top, Width, Height )
             A0     D0    D1   D2     D3

    VOID ChangeWindowBox( struct Window *, WORD, WORD, WORD, WORD );

    FUNCTION
    Makes simultaneous changes in window position and dimensions,
    in absolute (not relative) coordinates.

    Like MoveWindow() and SizeWindow(), the effect of this function
    is deferred until the next input comes along.  Unlike these
    functions, ChangeWindowBox() specifies absolute window position
    and dimensions, not relative.  This makes for more reliable
    results considering that the action is deferred, so this
    function is typically preferable to MoveWindow() and SizeWindow()
    paired.

    You can detect that this operation has completed by receiving
    the IDCMP_CHANGEWINDOW IDCMP message

    The dimensions are limited to legal range, but you should still
    take care to specify sensible inputs based on the window's dimension
    limits and the size of its screen.

    This function limits the position and dimensions to legal
    values.

    INPUTS
    Window = the window to change position/dimension
    Left, Top, Width, Height = new position and dimensions

    RESULT
    Position and dimension are changed to your specification,
    or as close as possible.
    Returns nothing.

    BUGS

    SEE ALSO
    MoveWindow(), SizeWindow(), ZipWindow(),
    layers.library/MoveSizeLayer()
intuition.library/ClearDMRequest             intuition.library/ClearDMRequest

    NAME
    ClearDMRequest -- Clear (detaches) the DMRequest of the window.

    SYNOPSIS
    Response = ClearDMRequest( Window )
    D0               A0

    BOOL ClearDMRequest( struct Window * );

    FUNCTION
    Attempts to clear the DMRequest from the specified window,
    that is detaches the special requester that you attach to
    the double-click of the menu button which the user can then
    bring up on demand.  This routine WILL NOT clear the DMRequest
    if it's active (in use by the user). The IDCMP message class
    IDCMP_REQCLEAR can be used to detect that the requester is not in use,
    but that message is sent only when the last of perhaps several
    requesters in use in a window is terminated.

    INPUTS
    Window = pointer to the window from which the DMRequest is to be cleared.

    RESULT
    If the DMRequest was not currently in use, detaches the DMRequest
    from the window and returns TRUE.

    If the DMRequest was currently in use, doesn't change anything
    and returns FALSE.

    BUGS

    SEE ALSO
    SetDMRequest(), Request()
intuition.library/ClearMenuStrip             intuition.library/ClearMenuStrip

    NAME
    ClearMenuStrip -- Clear (detach) the menu strip from the window.

    SYNOPSIS
    ClearMenuStrip( Window )
                A0

    VOID ClearMenuStrip( struct Window * );

    FUNCTION
    Detaches the current menu strip from the window; menu strips
    are attached to windows using the SetMenuStrip() function
    (or, for V36, ResetMenuStrip() ).

    If the menu is in use (for that matter if any menu is in use)
    this function will block (Wait()) until the user has finished.

    Call this function before you make any changes to the data
    in a Menu or MenuItem structure which is part of a menu
    strip linked into a window.

    INPUTS
    Window = pointer to a window structure

    RESULT
    None

    BUGS

    SEE ALSO
    SetMenuStrip(), ResetMenuStrip()
intuition.library/ClearPointer                 intuition.library/ClearPointer

    NAME
    ClearPointer -- Clear the mouse pointer definition from a window.

    SYNOPSIS
    ClearPointer( Window )
              A0

    VOID ClearPointer( struct Window * );

    FUNCTION
    Clears the window of its own definition of the Intuition mouse pointer.
    After calling ClearPointer(), every time this window is the active
    one the default Intuition pointer will be the pointer displayed
    to the user.  If your window is the active one when this routine
    is called, the change will take place immediately.

    Custom definitions of the mouse pointer which this function clears
    are installed by a call to SetPointer().

    INPUTS
    Window = pointer to the window to be cleared of its pointer definition

    RESULT
    None

    BUGS

    SEE ALSO
    SetPointer()
intuition.library/CloseScreen                   intuition.library/CloseScreen

    NAME
    CloseScreen -- Close an Intuition screen.

    SYNOPSIS
    [Success =] CloseScreen( Screen )
    [D0]                 A0

    [BOOL] CloseScreen( struct Screen * );
    /* returns BOOL in V36 and greater */

    FUNCTION
    Unlinks the screen, unlinks the viewport, deallocates everything that
    Intuition allocated when the screen was opened (using OpenScreen()).
    Doesn't care whether or not there are still any windows attached to the
    screen.  Doesn't try to close any attached windows; in fact, ignores
    them altogether (but see below for changes in V36).

    If this is the last screen to go, attempts to reopen Workbench.

    New for V36: this function will refuse to close the screen
    if there are windows open on the screen when CloseScreen() is
    called.  This avoids the almost certain crash when a screen
    is closed out from under a window.

    INPUTS
    Screen = pointer to the screen to be closed.

    RESULT
    New for V36: returns TRUE (1) if screen is closed,
    returns FALSE (0) if screen had open windows when
    called.

    BUGS

    SEE ALSO
    OpenScreen()
intuition.library/CloseWindow                   intuition.library/CloseWindow

    NAME
    CloseWindow -- Close an Intuition window.

    SYNOPSIS
    CloseWindow( Window )
             A0

    VOID CloseWindow( struct Window * );

    FUNCTION
    Closes an Intuition window.  Unlinks it from the system, deallocates
    its memory, and makes it disappear.

    When this function is called, all IDCMP messages which have been sent
    to your window are deallocated.  If the window had shared a message
    Port with other windows, you must be sure that there are no unreplied
    messages for this window in the message queue.  Otherwise, your program
    will try to make use of a linked list (the queue) which contains free
    memory (the old messages).  This will give you big problems.
    See the code fragment CloseWindowSafely(), below.

    NOTE:  If you have added a Menu strip to this Window (via
    a call to SetMenuStrip()) you must be sure to remove that Menu strip
    (via a call to ClearMenuStrip()) before closing your Window.

    NOTE: This function may block until it is safe to de-link and free
    your window.  Your program may thus be suspended while the user
    plays with gadgets, menus, or window sizes and position.

    New for V36: If your window is a "Visitor Window" (see OpenWindow)
    CloseWindow will decrement the "visitor count" in the public screen
    on which the window was open.  When the last visitor window is
    closed, a signal will be sent to the public screen task, if this
    was pre-arranged (see OpenScreen).

    INPUTS
    Window = a pointer to a Window structure

    RESULT
    None

    BUGS

    SEE ALSO
    OpenWindow(), OpenScreen(), CloseScreen()

    EXAMPLE
    /*    CloseWindowSafely */

    /* these functions close an Intuition window
     * that shares a port with other Intuition
     * windows or IPC customers.
     *
     * We are careful to set the UserPort to
     * null before closing, and to free
     * any messages that it might have been
     * sent.
     */
    #include "exec/types.h"
    #include "exec/nodes.h"
    #include "exec/lists.h"
    #include "exec/ports.h"
    #include "intuition/intuition.h"

    CloseWindowSafely( win )
    struct Window *win;
    {
        /* we forbid here to keep out of race conditions with Intuition */
        Forbid();

        /* send back any messages for this window
         * that have not yet been processed
         */
        StripIntuiMessages( win->UserPort, win );

        /* clear UserPort so Intuition will not free it */
        win->UserPort = NULL;

        /* tell Intuition to stop sending more messages */
        ModifyIDCMP( win, 0L );

        /* turn multitasking back on */
        Permit();

        /* and really close the window */
        CloseWindow( win );
    }

    /* remove and reply all IntuiMessages on a port that
     * have been sent to a particular window
     * (note that we don't rely on the ln_Succ pointer
     *  of a message after we have replied it)
     */
    StripIntuiMessages( mp, win )
    struct MsgPort *mp;
    struct Window *win;
    {
        struct IntuiMessage *msg;
        struct Node *succ;

        msg = (struct IntuiMessage *) mp->mp_MsgList.lh_Head;

        while( succ =  msg->ExecMessage.mn_Node.ln_Succ ) {

        if( msg->IDCMPWindow ==  win ) {

            /* Intuition is about to free this message.
             * Make sure that we have politely sent it back.
             */
            Remove( msg );

            ReplyMsg( msg );
        }

        msg = (struct IntuiMessage *) succ;
        }
    }
intuition.library/CloseWorkBench             intuition.library/CloseWorkBench

    NAME
    CloseWorkBench -- Closes the Workbench screen.

    SYNOPSIS
    Success = CloseWorkBench()
    D0

    LONG CloseWorkBench( VOID );

    FUNCTION
    This routine attempts to close the Workbench screen:
       -   Test whether or not any applications have opened windows on the
           Workbench, and return FALSE if so.  Otherwise ...
       -   Clean up all special buffers
       -   Close the Workbench screen
       -   Make the Workbench program mostly inactive (it will still
           monitor disk activity)
       -   Return TRUE

    INPUTS
    None

    RESULT
    TRUE if the Workbench screen closed successfully
    FALSE if the Workbench was not open, or if it has windows
        open which are not Workbench drawers.

   NOTES
    This routine has been drastically rewritten for V36.
    It is much more solid, although we haven't eliminated
    all the problem cases yet.

    BUGS
    The name of this function is improperly spelled.  Should
    be CloseWorkbench().

    It might be more convenient to have it return TRUE if the
    Workbench wasn't opened when called.  The idea as it is now
    is probably this: if you want to free up the memory of the
    Workbench screen when your program begins, you can call
    CloseWorkBench().  The return value of that call indicates
    whether you should call OpenWorkBench() when your program
    exits: if FALSE, that means either the the Workbench existed
    but you could not close it, or that it wasn't around to
    begin with, and you should not try to re-open it.

    We would prefer that you provide a user selection to attempt
    to open or close the Workbench screen from within your application,
    rather than your making assumptions like these.

    SEE ALSO
    OpenWorkBench()
intuition.library/CurrentTime                   intuition.library/CurrentTime

    NAME
    CurrentTime -- Get the current time values.

    SYNOPSIS
    CurrentTime( Seconds, Micros )
             A0       A1

    VOID CurrentTime( ULONG *, ULONG * );

    FUNCTION
    Puts copies of the current time into the supplied argument pointers.

    This time value is not extremely accurate, nor is it of a very fine
    resolution.  This time will be updated no more than sixty times a
    a second, and will typically be updated far fewer times a second.

    INPUTS
    Seconds = pointer to a LONG variable to receive the current seconds
        value
    Micros = pointer to a LONG variable for the current microseconds value

    RESULT
    Puts the time values into the memory locations specified by the
        arguments
    Return value is not defined.

    BUGS

    SEE ALSO
    timer.device/TR_GETSYSTIME
intuition.library/DisplayAlert                 intuition.library/DisplayAlert

    NAME
    DisplayAlert -- Create the display of an alert message.

    SYNOPSIS
    Response = DisplayAlert( AlertNumber, String, Height )
    D0             D0           A0      D1

    BOOL DisplayAlert( ULONG, UBYTE *, WORD );

    FUNCTION
    Creates an alert display with the specified message.

    If the system can recover from this alert, it's a RECOVERY_ALERT and
    this routine waits until the user presses one of the mouse buttons,
    after which the display is restored to its original state and a
    BOOL value is returned by this routine to specify whether or not
    the user pressed the LEFT mouse button.

    If the system cannot recover from this alert, it's a DEADEND_ALERT
    and this routine returns immediately upon creating the alert display.
    The return value is FALSE.

    NOTE: Starting with V33, if Intuition can't get enough
    memory for a RECOVERY_ALERT, the value FALSE will be returned.

    AlertNumber is a LONG value, historically related to the value
    sent to the Alert() routine.  But the only bits that are pertinent to
    this routine are the ALERT_TYPE bit(s).  These bits must be set to
    either RECOVERY_ALERT for alerts from which the system may safely
    recover, or DEADEND_ALERT for those fatal alerts.  These states are
    described in the paragraph above.   There is a third type of
    alert, the DAISY_ALERT, which is used only by the Exec.

    The string argument points to an AlertMessage string.  The AlertMessage
    string is comprised of one or more substrings, each of which is
    composed of the following components:
           - first, a 16-bit x-coordinate and an 8-bit y-coordinate,
             describing where on the alert display you want this string
             to appear.  The y-coordinate describes the offset to the
             baseline of the text.
           - then, the bytes of the string itself, which must be
             null-terminated (end with a byte of zero)
           - lastly, the continuation byte, which specifies whether or
             not there's another substring following this one.  If the
             continuation byte is non-zero, there IS another substring
             to be processed in this alert message.  If the continuation
             byte is zero, this is the last substring in the message.

    The last argument, Height, describes how many video lines tall you
    want the alert display to be.

    New for V36: Alerts are always rendered in Topaz 8 (80 column font),
    regardless of the system default font.  Also, RECOVERY_ALERTs are
    displayed in amber, while DEADEND_ALERTs are still red.  Alerts
    no longer push down the application screens to be displayed.  Rather,
    they appear alone in a black display.

    Also new for V36: Alerts block each other out, and input
    during an alert is deprived of the rest of the system.  Internal
    input buffers still cause alert clicks to be processed by
    applications sometimes.

    INPUTS
    AlertNumber = the number of this alert message.  The only pertinent
        bits of this number are the ALERT_TYPE bit(s).  The rest of the
           number is ignored by this routine.
    String = pointer to the alert message string, as described above
    Height = minimum display lines required for your message

    RESULT
    A BOOL value of TRUE or FALSE.  If this is a DEADEND_ALERT, FALSE
    is always the return value.  If this is a RECOVERY_ALERT. The return
    value will be TRUE if the user presses the left mouse button in
    response to your message, and FALSE if the user presses the right hand
    button is response to your text, or if the alert could not
    be posted.

    BUGS
    If the system is worse off than you think, the level of your alert
    may become DEADEND_ALERT without you ever knowing about it.  This
    will NOT happen due simply to low memory.  Rather, the alert
    display will be skipped, and FALSE will be returned.

    The left and right button clicks satisfying the alerts are
    unfortunately passed to    the normal applications, because of
    some internal system input buffering.

    SEE ALSO

intuition.library/DisplayBeep                   intuition.library/DisplayBeep

    NAME
    DisplayBeep -- Flash the video display.

    SYNOPSIS
    DisplayBeep( Screen )
             A0

    VOID DisplayBeep( struct Screen * );

    FUNCTION
    "Beeps" the video display by flashing the background color of the
    specified screen.  If the screen argument is NULL, every screen
    in the display will be beeped.  Flashing everyone's screen is not
    a polite thing to do, so this should be reserved for dire
    circumstances.

    The reason such a routine is supported is because the Amiga has
    no internal bell or speaker.  When the user needs to know of
    an event that is not serious enough to require the use of a requester,
    the DisplayBeep() function may be called.

    New for V36:  Intuition now calls DisplayBeep through the
    external library vector.  This means that if you call SetFunction()
    to replace DisplayBeep with an audible beep, for example, then
    your change will affect even Intuition's calls to DisplayBeep.

    INPUTS
    Screen = pointer to a screen.  If NULL, every screen in the display
           will be flashed

    RESULT
    None

    BUGS

    SEE ALSO

intuition.library/DisposeObject               intuition.library/DisposeObject

    NAME
    DisposeObject -- Deletes a 'boopsi' object. (V36)

    SYNOPSIS
    DisposeObject( Object )
                   A0

    VOID DisposeObject( APTR );

    FUNCTION
    Deletes a boopsi object and all of it auxiliary data.
    These objects are all created by NewObject().  Objects
    of certain classes "own" other objects, which will also
    be deleted when the object is passed to DisposeObject().
    Read the per-class documentation carefully to be aware
    of these instances.

    INPUTS
    Object = abstract pointer to a boopsi object returned by NewObject()

    NOTES
    This function invokes the OM_DISPOSE method.

    RESULT
    None.

    BUGS

    SEE ALSO
    NewObject(), SetAttrs(), GetAttr(), MakeClass(),
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.
intuition.library/DoubleClick                   intuition.library/DoubleClick

    NAME
    DoubleClick -- Test two time values for double-click timing.

    SYNOPSIS
    IsDouble = DoubleClick( StartSecs, StartMicros,
    D0                      D0         D1
        CurrentSecs, CurrentMicros )
        D2           D3

    BOOL DoubleClick( ULONG, ULONG, ULONG, ULONG );

    FUNCTION
    Compares the difference in the time values with the double-click
    timeout range that the user has set (using the "Preferences" tool) or
    some other program has configured into the system.  If the
    difference between the specified time values is within the current
    double-click time range, this function returns TRUE, else it
    returns FALSE.

       These time values can be found in input events and IDCMP messages.
       The time values are not perfect; however, they are precise enough for
       nearly all applications.

    INPUTS
    StartSeconds, StartMicros = the timestamp value describing the start of
          the double-click time period you are considering
    CurrentSeconds, CurrentMicros = the timestamp value describing
          the end of the double-click time period you are considering

    RESULT
    If the difference between the supplied timestamp values is within the
    double-click time range in the current set of Preferences, this
    function returns TRUE, else it returns FALSE

    BUGS

    SEE ALSO
    CurrentTime()
intuition.library/DrawBorder                     intuition.library/DrawBorder

    NAME
    DrawBorder -- Draw the specified Border structure into a RastPort.

    SYNOPSIS
    DrawBorder( RastPort, Border, LeftOffset, TopOffset )
            A0        A1      D0          D1

    VOID DrawBorder( struct RastPort *, struct Border *, WORD, WORD );

    FUNCTION
    First, sets up the draw mode and pens in the RastPort according to the
    arguments of the Border structure.  Then, draws the vectors of
    the border argument into the RastPort, offset by the left and top
    offsets.

    As with all graphics rendering routines, the border will be clipped to
    to the boundaries of the RastPort's layer, if it exists.  This is
    the case with window RastPorts.

    This routine will draw all borders in the NULL-terminated list linked
    by the NextBorder field of the border argument.

    INPUTS
    RastPort = pointer to the RastPort to receive the border rendering
    Border = pointer to a Border structure
    LeftOffset = the offset to be added to each vector's x coordinate
    TopOffset = the offset to be added to each vector's y coordinate

    RESULT
    None

    BUGS

    SEE ALSO

intuition.library/DrawImage                       intuition.library/DrawImage

    NAME
    DrawImage -- Draw the specified Image structure into a RastPort.

    SYNOPSIS
    DrawImage( RastPort, Image, LeftOffset, TopOffset )
           A0        A1     D0          D1

    VOID DrawImage( struct RastPort *, struct Image    *, WORD, WORD );

    FUNCTION
    First, sets up the draw mode and pens in the RastPort according to the
    arguments of the Image structure.  Then, moves the image data of
    the image argument into the RastPort, offset by the left and top
    offsets.

    This routine does window layer clipping if you pass your window's
    (layered) RastPort -- if you draw an image outside of your window,
    your imagery will be clipped at the window's edge.  If you pass
    a (non-layered) screen RastPort, you MUST be sure your image is
    wholly contained within the rastport bounds.

    If the NextImage field of the image argument is non-NULL,
    the next image is rendered as well, and so on until some
    NextImage field is found to be NULL.

    INPUTS
    RastPort = pointer to the RastPort to receive image rendering
    Image = pointer to an image structure
    LeftOffset = the offset which will be added to the image's x coordinate
    TopOffset = the offset which will be added to the image's y coordinate

    RESULT
    None

    NOTES
    Intuition always has and will continue to assume there are
    at least as many planes of data pointed to by ImageData as there
    are '1' bits in the PlanePick field.  Please ensure that
    this is so.  (See the intuition.h include file for full details
    on using PlanePick).

    BUGS

    SEE ALSO
    DrawImageState(), EraseImage()
intuition.library/DrawImageState             intuition.library/DrawImageState

   NAME
    DrawImageState -- Draw an (extended) Intuition Image with
        special visual state. (V36)

   SYNOPSIS
    DrawImageState( RPort, Image, LeftOffset, TopOffset, State, DrawInfo )
            A0     A1     D0          D1         D2     A2

    VOID DrawImageState( struct RastPort *, struct Image *,
        WORD, WORD, ULONG, struct DrawInfo * );

   FUNCTION
    This function draws an Intuition Image structure in a variety of
    "visual states," which are defined by constants in
    intuition/imageclass.h.  These include:
    IDS_NORMAL        - like DrawImage()
    IDS_SELECTED        - represents the "selected state" of a Gadget
    IDS_DISABLED        - the "ghosted state" of a gadget
    IDS_BUSY        - for future functionality
    IDS_INDETERMINATE    - for future functionality
    IDS_INACTIVENORMAL    - for gadgets in window border
    IDS_INACTIVESELECTED    - for gadgets in window border
    IDS_INACTIVEDISABLED    - for gadgets in window border

    Only IDS_NORMAL will make sense for traditional Image structures,
    this function is more useful when applied to new custom images
    or "object-oriented image classes."

    Each class of custom images is responsible for documenting which
    visual states it supports, and you typically want to use images
    which support the appropriate states with your custom gadgets.

    The DrawInfo parameter provides information invaluable to
    "rendered" images, such as pen color and resolution.  Each
    image class must document whether this parameter is required.

   INPUTS
     RPort    - RastPort for rendering
    Image    - pointer to a (preferably custom) image
    LeftOffset,RightOffset - positional offsets in pixels
    State    - visual state selected from above
    DrawInfo - pointer to packed of pen selections and resolution.

   RESULT
     None.

   EXAMPLE
    Provided separately in the DevCon '90 disk set.

   NOTES


   BUGS


   SEE ALSO
    DrawImage(), GetScreenDrawInfo(), intuition/imageclass.h

intuition.library/EasyRequestArgs           intuition.library/EasyRequestArgs

    NAME
    EasyRequestArgs -- Easy alternative to AutoRequest(). (V36)
    EasyRequest -- Varargs stub for EasyRequestArgs(). (V36)

    SYNOPSIS
    num = EasyRequestArgs( Window, easyStruct, IDCMP_ptr, ArgList )
    D0                     A0      A1          A2         A3

    LONG EasyRequestArgs( struct Window *, struct EasyStruct *,
        ULONG *, APTR );

    num = EasyRequest( Window, easyStruct, IDCMP_ptr, Arg1, Arg2, ... )

    LONG EasyRequest( struct Window *, struct EasyStruct *,
        ULONG *, APTR, ... );

    ( from intuition.h )
    struct EasyStruct {
        ULONG    es_StructSize;
        ULONG    es_Flags;
        UBYTE    *es_Title;
        UBYTE    *es_TextFormat;
        UBYTE    *es_GadgetFormat;
    };

    FUNCTION
    This function provides a simpler method of using a 'System
    Requester' than provided by AutoRequest().  It performs layout
    and size calculations sensitive to the current font and screen
    resolution.

    It provides for the descriptive 'body' text and the gadget
    text to be constructed from 'printf' style format strings.

    It also provides a general way for the requester to be
    sensitive to particular IDCMP messages.

    The first function listed is the actual Intuition library
    function.  It is passed the arguments for the formatting
    operations as a pointer to the first argument.

    The second function uses a C-style variable number of argument
    (varargs) calling convention.  It should be implemented as
    a call to the first function, and might be supplied by your
    compiler vendor, in amiga.lib, or using the first example below,
    for most C compilers.

    NOTE: The formatting is done by exec.library/RawDoFmt(), so
    be aware that to display a 32-bit integer argument, for
    example, you must say "%ld", not "%d", since RawDoFmt() is
    "word-oriented."

    NOTE: This function switches the processor stack to ensure
    sufficient stack space for the function to complete.

    EXAMPLES
    /* varargs interface works for most C compilers */
    EasyRequest( w, es, ip, arg1 )
    struct Window    *w;
    struct EasyStruct *es;
    ULONG          *ip;
    int          arg1;
    {
        return ( EasyRequestArgs( w, es, ip, &arg1 ) );
    }

    /*********************************************/

    /* typical use */
    struct EasyStruct volumeES = {
        sizeof (struct EasyStruct),
        0,
        "Volume Request",
        "Please insert volume %s in any drive.",
        "Retry|Cancel",
    };
    #define CANCEL    (0)

    Volume    *
    getVolume( volname )
    UBYTE    *volname;
    {
        Volume    *vptr;
        Volume    *findVolume();
        UWORD    reply;
        ULONG    iflags;

        iflags = IDCMP_DISKINSERTED;

    while ( ((vptr = findVolume( volname )) == NULL) &&
     (EasyRequest( w, &volumeES, &iflags, volname ) != CANCEL) )
        /* loop */ ;

        /* note that in some circumstances, you will have to
           re-initialize the value of 'iflags'.  Here, it
           is either unchanged, or returned as the single
           IDCMPFlag value IDCMP_DISKINSERTED.  If you combine
           multiple  IDCMPFlag values in 'iflags,' only
           one will be returned, so you must reinitialize
           'iflags' to be the combination.
          */
        return ( vptr );
    }

    INPUTS
    Window = Reference window pointer, determines the screen and
        title of the requester window.  This can be NULL, which
        means the requester is to appear on the Workbench screen,
        or default public screen, if defined.
    IDCMP_ptr = Pointer to IDCMP flags that you want to terminate
        the requester.  This pointer may be NULL.
    easyStruct = Pointer to EasyStruct structure with fields
        interpreted as follows:

    es_StructSize = sizeof (struct EasyStruct), for future extension.
    es_Flags = 0 for now, in the future may specify other options.
    es_Title = Title of system requester window.  If this is NULL,
        the title will be taken to be the same as the title of 'Window',
        if provided, or else "System Request."
    es_TextFormat = Format string, a la RawDoFmt(), for message in
        requester body.  Lines are separated by '\n'.  Formatting
        '%' functions are supported exactly as in RawDoFmt().
    es_GadgetFormat = Format string for gadgets.  Text for separate
        gadgets is separated by '|'.  Format functions are supported.
        You MUST specify at least one gadget.

    Args = Arguments for format commands.   Arguments for
        GadFmt follow arguments for TextFmt.

    RESULT
    0, 1, ..., N = Successive GadgetID values, for the gadgets
        you specify for the requester.  NOTE: The numbering
        from left to right is actually: 1, 2, ..., N, 0.
        This is for compatibility with AutoRequests which has
        FALSE for the rightmost gadget.

    -1 = Means that one of the caller-supplied IDCMPFlags occurred.
        The IDCMPFlag value is in the longword pointed to by IDCMP_ptr.

    BUGS
    Does not fall back to a recoverable alert if the requester
     cannot be created.

    Does not handle case when gadgets don't fit or window title
    is too long, although it does trim trailing spaces from the
    title for calculating dimensions.

    PLANS
    Possible enhancements include: centering of text, size-sensitive
    layout,  window-relative requester, vertical gadget layout,
    window placement, more keyboard shortcuts.

    We also reserve the use of the newline character '\n' in
    gadget format strings for future use as a line separator.

    SEE ALSO
    exec.library/RawDoFmt(), BuildEasyRequestArgs(), SysReqHandler(),
    AutoRequest(), BuildSysRequest()
intuition.library/EndRefresh                     intuition.library/EndRefresh

    NAME
    EndRefresh -- End the optimized refresh state of the window.

    SYNOPSIS
    EndRefresh( Window, Complete )
            A0      D0

    VOID EndRefresh( struct Window *, BOOL );

    FUNCTION
    This function gets you out of the special refresh state of your
    window.  It is called following a call to BeginRefresh(), which
    routine puts you into the special refresh state.  While your window
    is in the refresh state, the only rendering that will be wrought in
    your window will be to those areas which were recently revealed and
    need to be refreshed.

    After you've done all the refreshing you want to do for this window,
    you should call this routine to restore the window to its
    non-refreshing state.  Then all rendering will go to the entire
    window, as usual.

    The 'Complete' argument is a boolean TRUE or FALSE value used to
    describe whether or not the refreshing you've done was all the
    refreshing that needs to be done at this time.  Most often, this
    argument will be TRUE.  But if, for instance, you have multiple
    tasks or multiple procedure calls which must run to completely
    refresh the window, then each can call its own Begin/EndRefresh()
    pair with a Complete argument of FALSE, and only the last calls
    with a Complete argument of TRUE.

    WARNING:  Passing this function the value of FALSE has its
    pitfalls.  Please see the several caveats in the autodoc for
    BeginRefresh().

    For your information, this routine calls the Layers library function
    EndUpdate(), unlocks your layers (calls UnlockLayerRom()), clears
    the LAYERREFRESH bit in your Layer Flags, and clears the
    WFLG_WINDOWREFRESH bit in your window Flags.

    INPUTS
    Window = pointer to the window currently in optimized-refresh mode
    Complete = Boolean TRUE or FALSE describing whether or not this
           window is completely refreshed

    RESULT
    None

    BUGS

    SEE ALSO
    BeginRefresh(), layers.library/EndUpdate(),
    graphics.library/UnlockLayerRom()
intuition.library/EndRequest                     intuition.library/EndRequest

    NAME
    EndRequest -- Remove a currently active requester.

   SYNOPSIS
    EndRequest( Requester, Window )
            A0         A1

    VOID EndRequest( struct Requester *, struct Window * );

    FUNCTION
    Ends the request by erasing the requester and decoupling it from
    the window.

    Note that this doesn't necessarily clear all requesters from the window,
    only the specified one.  If the window labors under other requesters,
    they will remain in the window.

    INPUTS
    Requester = pointer to the requester to be removed
    Window = pointer to the Window structure with which this requester
           is associated

    RESULT
    None

    BUGS

    SEE ALSO
    Request()
intuition.library/EraseImage                     intuition.library/EraseImage

   NAME
    EraseImage -- Erases an Image. (V36)

   SYNOPSIS
    EraseImage( RPort, Image, LeftOffset, TopOffset )
                A0     A1     D0          D1

    VOID EraseImage( struct RastPort *, struct Image *, WORD, WORD );

   FUNCTION
    Erases an Image.  For a normal Image structure, this will
    call the graphics function EraseRect() (clear using layer
    backfill, if any) for the Image box (LeftEdge/TopEdge/Width/Height).

    For custom image, the exact behavior is determined by the
    custom image class.

   INPUTS
     RPort    - RastPort to erase a part of
    Image    - custom or standard image
    LeftOffset,RightOffset - pixel offsets of Image position

   RESULT
     None.

   EXAMPLE


   NOTES


   BUGS


   SEE ALSO
    graphics.library/EraseRect().

intuition.library/FreeClass                       intuition.library/FreeClass

    NAME
    FreeClass -- Frees a boopsi class created by MakeClass(). (V36)

    SYNOPSIS
    success = FreeClass( ClassPtr )
    D0                   A0

    BOOL FreeClass( struct IClass * );

    FUNCTION
    For class implementors only.

    Tries to free a boopsi class created by MakeClass().  This
    won't always succeed: classes with outstanding objects or
    with subclasses cannot be freed.  You cannot allow the code
    which implements the class to be unloaded in this case.

    For public classes, this function will *always* remove
    the class (see RemoveClass() ) making it unavailable, whether
    it succeeds or not.

    If you have a dynamically allocated data for your class (hanging
    off of cl_UserData), try to free the class before you free the
    user data, so you don't get stuck with a half-freed class.

    INPUTS
    ClassPtr - pointer to a class created by MakeClass().

    RESULT
    Returns FALSE if the class could not be freed.  Reasons include,
    but will not be limited to, having non-zero cl_ObjectCount or
    cl_SubclassCount.

    Returns TRUE if the class could be freed.

    Calls RemoveClass() for the class in either case.

    EXAMPLE
    Freeing a private class with dynamically allocated user data:

    freeMyClass( cl )
    struct IClass    *cl;
    {
        struct MyPerClassData    *mpcd;

        mpcd = (struct MyPerClassData *) cl->cl_UserData;
        if ( FreeClass( cl ) )
        {
        FreeMem( mpcd, sizeof mpcd );
        return ( TRUE );
        }
        else
        {
        return ( FALSE );
        }
    }

    BUGS

    SEE ALSO
    MakeClass(),
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.

intuition.library/FreeRemember                 intuition.library/FreeRemember

    NAME
    FreeRemember -- Free memory allocated by calls to AllocRemember().

    SYNOPSIS
    FreeRemember( RememberKey, ReallyForget )
              A0           D0

    VOID FreeRemember( struct Remember **, BOOL );

    FUNCTION
    This function frees up memory allocated by the AllocRemember() function.
    It will either free up just the Remember structures, which supply the
    link nodes that tie your allocations together, or it will deallocate
    both the link nodes AND your memory buffers too.

    If you want to deallocate just the Remember structure link nodes,
    you should set the ReallyForget argument to FALSE.  However, if you
    want FreeRemember to really deallocate all the memory, including
    both the Remember structure link nodes and the buffers you requested
    via earlier calls to AllocRemember(), then you should set the
    ReallyForget argument to TRUE.

    NOTE WELL: Once you call this function passing it FALSE, the
    linkages between all the memory chunks are lost, and you
    cannot subsequently use FreeRemember() to free them.

    INPUTS
    RememberKey = the address of a pointer to struct Remember.  This
           pointer should either be NULL or set to some value (possibly
           NULL) by a call to AllocRemember().
    ReallyForget = a BOOL FALSE or TRUE describing, respectively,
           whether you want to free up only the Remember nodes or
           if you want this procedure to really forget about all of
           the memory, including both the nodes and the memory buffers
           referenced by the nodes.

    EXAMPLE
    struct Remember *RememberKey;
    RememberKey = NULL;
    AllocRemember(&RememberKey, BUFSIZE, MEMF_CHIP);
    FreeRemember(&RememberKey, TRUE);

    RESULT
    None

    BUGS

    SEE ALSO
    AllocRemember(), exec.library/FreeMem()
intuition.library/FreeScreenDrawInfo     intuition.library/FreeScreenDrawInfo

   NAME
     FreeScreenDrawInfo -- Finish using a DrawInfo structure. (V36)

   SYNOPSIS
    FreeScreenDrawInfo( Screen, DrInfo )
                A0      A1

    VOID FreeScreenDrawInfo( struct Screen *, struct DrawInfo * );

   FUNCTION
    Declares that you are finished with the DrawInfo structure
    returned by GetScreenDrawInfo().

   INPUTS
     Screen          - pointer to screen passed to GetScreenDrawInfo()
    DrInfo      - pointer to DrawInfo returned by GetScreenDrawInfo()

   RESULT
     None

   NOTES
    This function, and GetScreenDrawInfo(), don't really do much, but
    they provide an upward compatibility path.  That means that
    if you misuse them today, they probably won't cause a problem,
    although they may someday later.  So, please be very careful
    only to use the DrawInfo structure between calls to
    GetScreenDrawInfo() and FreeScreenDrawInfo(), and be sure
    that you don't forget FreeScreenDrawInfo().

   BUGS

   SEE ALSO
    GetScreenDrawInfo()

intuition.library/FreeSysRequest             intuition.library/FreeSysRequest

    NAME
    FreeSysRequest -- Free resources gotten by a call to BuildSysRequest().

    SYNOPSIS
    FreeSysRequest( Window )
                A0

    VOID FreeSysRequest( struct Window * );

    FUNCTION
    This routine frees up all memory allocated by a successful call to
    the BuildSysRequest() procedure.  If BuildSysRequest() returned a
    pointer to a window, then you are able to wait on the message port
    of that window to detect an event which satisfies the requester.
    When you want to remove the requester, you call this procedure.  It
    ends the requester and deallocates any memory used in the creation
    of the requester.  It also closes the special window that was opened
    for your system requester.

    For V36: It's OK if you pass a NULL or a TRUE (1) value to
    this function.  Also, this function properly disposes of
    requesters gotten using BuildEasyRequest().

    INPUTS
    Window = value of the window pointer returned by a successful call to
           the BuildSysRequest() procedure

    RESULT
    None

    BUGS

    SEE ALSO
    BuildSysRequest(), AutoRequest(), CloseWindow()
intuition.library/GadgetMouse                   intuition.library/GadgetMouse

    NAME
    GadgetMouse -- Calculate gadget-relative mouse position. (V36)

    SYNOPSIS
    GadgetMouse( Gadget, GInfo, MousePoint )
             A0      A1     A2

    VOID GadgetMouse( struct GadgetInfo *, WORD * );

    FUNCTION
    Determines the current location of the mouse pointer relative
    to the upper-left corner of a custom gadget.  Typically used
    only in the GM_HANDLEINPUT and GM_GOACTIVE custom gadget hook
    routines.

    NEWS FLASH!!: These two hook routines are now passed the mouse
    coordinates, so this function has no known usefulness.

    We recommend that you don't call it.

    Note that this function calculates the mouse position taking
    "gadget relativity" (GFLG_RELRIGHT, GFLG_RELBOTTOM) into
    consideration.  If your custom gadget intends to ignore these
    properties, then you should either enjoin or inhibit your users
    from setting those bits, since Intuition won't ask if you respect
    them.

    INPUTS
    GInfo = A pointer to a GadgetInfo structure as passed to the
        custom gadget hook routine.
    MousePoint = address of two WORDS, or a pointer to a structure of
        type Point.

    RESULT
    Returns nothing.  Fills in the two words pointed to by
    MousePoint with the gadget-relative mouse position.

    BUGS
    Useless, since equivalent information is now passed to every
    function that might have a use for this.

    SEE ALSO

intuition.library/GetAttr                           intuition.library/GetAttr

    NAME
    GetAttr -- Inquire the value of some attribute of an object. (V36)

    SYNOPSIS
    attr = GetAttr( AttrID, Object, StoragePtr )
    D0        D0    A0    A1

    ULONG GetAttr( ULONG, APTR, ULONG * );

    FUNCTION
    Inquires from the specified object the value of the specified attribute.

    You always pass the address of a long variable, which will
    receive the same value that would be passed to SetAttrs() in
    the ti_Data portion of a TagItem element.  See the documentation
    for the class for exceptions to this general rule.

    Not all attributes will respond to this function.  Those that
    will are documented on a class-by-class basis.

    INPUTS
    AttrID = the attribute tag ID understood by the object's class
    Object = abstract pointer to the boopsi object you are interested in
    StoragePtr = pointer to appropriate storage for the answer

    RESULT
    Returns FALSE (0) if the inquiries of attribute are not provided
    by the object's class.

    NOTES
    This function invokes the OM_GET method of the object.

    BUGS

    SEE ALSO
    NewObject(), DisposeObject(), SetAttrs(), MakeClass(),
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.

intuition.library/GetDefaultPubScreen   intuition.library/GetDefaultPubScreen

    NAME
    GetDefaultPubScreen -- Get name of default public screen. (V36)

    SYNOPSIS
    GetDefaultPubScreen( Namebuff )
                 A0

    VOID GetDefaultPubScreen( UBYTE * );

    FUNCTION
    Provides the name of the current default public screen.
    Only anticipated use is for Public Screen Manager utilities,
    since it is easy to open a visitor window on the default
    public screen without specifying the name.

    INPUTS
    Namebuff = a buffer of MAXPUBSCREENNAME.  This can be NULL.

    RESULT
    None.  Will provide the string "Workbench" in Namebuff if there
    is no current default public screen.

    NOTE
    This function actually "returns" in register D0 a pointer
    to the public screen.  Unfortunately, the lifespan of
    this pointer is not ensured; the screen could be closed
    at any time.  The *ONLY* legitimate use we can see for
    this return value is to compare for identity with the pointer
    to a public screen you either have a window open in, or
    a lock on using LockPubScreen(), to determine if that
    screen is in fact the default screen.

    BUGS
    The function prototype does not reflect the return value.

    SEE ALSO
    SetDefaultPubScreen(), OpenWindow()
intuition.library/GetDefPrefs                   intuition.library/GetDefPrefs

    NAME
    GetDefPrefs -- Get a copy of the the Intuition default Preferences.

    SYNOPSIS
    Prefs = GetDefPrefs( PrefBuffer, Size )
    D0             A0          D0

    struct Preferences *GetDefPrefs( struct Preferences *, WORD );

    FUNCTION
    Gets a copy of the Intuition default preferences data.  Writes the
    data into the buffer you specify.  The number of bytes you want
    copied is specified by the size argument.

    The default preferences are those that Intuition uses when it
    is first opened.  If no preferences file is found, these are
    the preferences that are used.  These would also be the startup
    preferences in an AmigaDOS-less environment.

    It is legal to take a partial copy of the Preferences structure.
    The more pertinent preferences variables have been grouped near
    the top of the structure to facilitate the memory conservation
    that can be had by taking a copy of only some of the Preferences
    structure.

    INPUTS
    PrefBuffer = pointer to the memory buffer to receive your copy of the
                Intuition Preferences structure
    Size = the number of bytes in your PrefBuffer, the number of bytes
          you want copied from the system's internal Preference settings

    RESULT
    Returns your parameter PrefBuffer.

    BUGS

    SEE ALSO
    GetPrefs()
intuition.library/GetPrefs                         intuition.library/GetPrefs

    NAME
    GetPrefs -- Get the current Intuition Preferences structure.

    SYNOPSIS
    Prefs = GetPrefs( PrefBuffer, Size )
    D0          A0          D0

    struct Preferences *GetPrefs( struct Preferences *, WORD );

    FUNCTION
    Gets a copy of the current Intuition Preferences structure.
    Writes the data into the buffer you specify.  The number of bytes you
    want copied is specified by the size argument.

    It is legal to take a partial copy of the Preferences structure.
    The more pertinent preferences variables have been grouped near
    the top of the structure to facilitate the memory conservation
    that can be had by taking a copy of only some of the Preferences
    structure.

    New for V36:  A new and more extensible method for supplying
    Preferences has been introduced in V36, and relies on file
    system notification.  The Intuition preferences items rely
    also on the IPrefs program.  Certain elements of the
    Preferences structure have been superceded by this new method.
    As much as possible, the Preferences structure returned by
    GetPrefs() reflect the current state of Preferences.  However,
    it is impossible to represent some of the V36-style preferences
    items using the existing Preferences structure.

    INPUTS
    PrefBuffer = pointer to the memory buffer to receive your copy of the
           Intuition Preferences
    Size = the number of bytes in your PrefBuffer, the number of bytes
           you want copied from the system's internal Preference settings

    RESULT
    Returns your parameter PrefBuffer.

    BUGS

    SEE ALSO
    GetDefPrefs(), SetPrefs()
intuition.library/GetScreenData               intuition.library/GetScreenData

    NAME
    GetScreenData -- Get copy of a screen data structure.

    SYNOPSIS
    Success = GetScreenData( Buffer, Size, Type, Screen )
    D0                       A0      D0    D1    A1

    BOOL GetScreenData( APTR, UWORD, UWORD, struct Screen * );

    FUNCTION
    This function copies into the caller's buffer data from a Screen
    structure.  Typically, this call will be used to find the size, title
    bar height, and other values for a standard screen, such as the
    Workbench screen.

    To get the data for the Workbench screen, one would call:
        GetScreenData(buff, sizeof(struct Screen), WBENCHSCREEN, NULL)

    NOTE: if the requested standard screen is not open, this function
    will have the effect of opening it.

    This function has been useful for two basic types of things:
    1) Determining information about the Workbench screen, in
       preparation for opening a window on it.
    2) Attempts at discerning the user's preferences in a working
       screen, for "cloning" the Workbench modes and dimensions
       when opening a similar custom screen.

    Providing compatibility with both of these goals has proven
    difficult, as we introduce new display modes and screen scrolling
    in V36.  Read carefully the somewhat involved exceptions we
    elected to implement ...

    Changes as of V36:

    For V36 and later, the function LockPubScreen() is an improvement
    over this function, in that it doesn't copy the screen data
    but returns a pointer and a guarantee that the screen will not
    be closed.

    If the global public screen SHANGHAI mode is in effect (see
    SetPubScreenModes() ), this function will actually report on
    the default public screen, where "Workbench" windows will
    actually open.

    For V36 and later, this function does some "compatibility tricks"
    when you inquire about the WBENCHSCREEN.  To keep programs from
    "stumbling" into modes they don't understand, and because an NTSC
    machine may be running a PAL Workbench or PRODUCTIVITY, for example,
    the following "false" information is returned.

    The Screen.ViewPort.Modes field will either be HIRES or HIRES+LACE
    (with the SPRITES flag also set, as usual).  HIRES+LACE is
    used if the display mode selected for the Workbench screen
    is an interlaced screen of any type.

    The dimensions returned will be the *smaller* of the OSCAN_TEXT
    dimensions for the returned mode, and the actual dimensions
    of the Workbench screen.

    EXCEPTION: For specific compatibility considerations, if the
    Workbench is in one of the A2024 modes, the mode returned
    in Screen.ViewPort.Modes will be HIRES+LACE (with perhaps
    some "special" bits also set for future improvement), but
    with dimensions equal to the actual A2024-mode Workbench screen.
    This will favor programs which open windows on the A2024
    Workbench, but will cause some problems for programs which
    try to "clone" the Workbench screen using this function.

    If you want the real information about the modern Workbench
    screen, call LockPubScreen( "Workbench" ) and acquire its
    display mode ID by inquiring of the actual ViewPort (using
    graphics.library/GetVPModeID() ).

    You may then use the information you get to clone as many of
    the properties of the Workbench screen that you wish.

    In the long run, it's probably better to provide your user
    with a screen mode selection option, and skip all this.

    INPUTS
    Buffer = pointer to a buffer into which data can be copied
    Size   = the size of the buffer provided, in bytes
    Type   = the screen type, as specified in OpenWindow() (WBENCHSCREEN,
        CUSTOMSCREEN, ...)
    Screen = ignored, unless type is CUSTOMSCREEN, which results only in
        copying 'size' bytes from 'screen' to 'buffer'

    RESULT
    TRUE if successful
    FALSE if standard screen of Type 'type' could not be opened.

    BUGS
    You cannot support the new V36 display modes using this function.

    SEE ALSO
    OpenWindow(), LockPubScreen(), graphics.library/GetVPModeID(),
    SetPubScreenModes(), OpenScreen()
intuition.library/GetScreenDrawInfo       intuition.library/GetScreenDrawInfo

   NAME
    GetScreenDrawInfo -- Get pointer to rendering information. (V36)

   SYNOPSIS
    DrInfo = GetScreenDrawInfo( Screen )
    D0                  A0

    struct DrawInfo *GetScreenDrawInfo( struct Screen * );

   FUNCTION
    Returns a pointer to a DrawInfo structure derived from the
    screen passed.  This data structure is READ ONLY.  The field
    dri_Version identifies which version of struct DrawInfo you
    are given a pointer to.

   INPUTS
     Screen        - pointer to a valid, open screen.

   RESULT
     DrInfo - pointer to a system-allocated DrawInfo structure,
    as defined in intuition/screens.h.

   NOTES
    Some information in the DrawInfo structure may in the future
    be calculated the first time this function is called for a
    particular screen.

    You must call FreeScreenDrawInfo() when you are done using the
    returned pointer.

    This function does not prevent a screen from closing.  Apply it
    only to the screens you opened yourself, or apply a protocol
    such as LockPubScreen().

    WARNING: Until further notice, the pointer returned does not
    remain valid after the screen is closed.

    This function and FreeScreenDrawInfo() don't really do much now,
    but they provide an upward compatibility path.  That means that
    if you misuse them today, they probably won't cause a problem,
    although they may someday later.  So, please be very careful
    only to use the DrawInfo structure between calls to
    GetScreenDrawInfo() and FreeScreenDrawInfo(), and be sure
    that you don't forget FreeScreenDrawInfo().

   BUGS
    Does not reflect to changes in screen modes, depth, or pens.

   SEE ALSO
    FreeScreenDrawInfo(), LockPubScreen(), intuition/screens.h

intuition.library/InitRequester               intuition.library/InitRequester

    NAME
    InitRequester -- Initialize a Requester structure.

    SYNOPSIS
    InitRequester( Requester )
               A0

    VOID InitRequester( struct Requester * );

    FUNCTION
    Initializes a requester for general use.  After calling InitRequester,
    you need fill in only those Requester values that fit your needs.
    The other values are set to NULL--or zero--states.

    Note that the example in the early versions of the Intuition
    Reference Manual is flawed because the Requester structure is
    initialized BEFORE InitRequester is called.  Be sure to
    perform your initialization AFTER calling InitRequester.

    INPUTS
    Requester = a pointer to a Requester structure

    RESULT
    None

    BUGS
    Since the publication of the first Intuition Manual to this
    day, most people haven't used this function, and for
    compatibility reasons, we'll never be able to assume that
    they do.  Thus, this function is useless.

    SEE ALSO

intuition.library/IntuiTextLength           intuition.library/IntuiTextLength

    NAME
    IntuiTextLength -- Return the length (pixel-width) of an IntuiText.

    SYNOPSIS
    Length = IntuiTextLength( IText )
    D0                        A0

    LONG IntuiTextLength( struct IntuiText * );

    FUNCTION
    This routine accepts a pointer to an instance of an IntuiText structure,
    and returns the length (the pixel-width) of the string which that
    instance of the structure represents.

    NOTE: if the Font pointer of your IntuiText structure is set to NULL,
    you'll get the pixel-width of your text in terms of the current system
    default font.  You may wish to be sure that the field IText->ITextFont
    for 'default font' text is equal to the Font field of the screen it is
    being measured for.

    INPUTS
    IText = pointer to an instance of an IntuiText structure

    RESULT
    Returns the pixel-width of the text specified by the IntuiText data

    BUGS
    Would do better to take a RastPort as argument, so that a NULL in
    the Font pointer would lead automatically to the font for the
    intended target RastPort, rather than the system default font.

    SEE ALSO
    OpenScreen()
intuition.library/ItemAddress                   intuition.library/ItemAddress

    NAME
    ItemAddress -- Returns the address of the specified MenuItem.

    SYNOPSIS
    Item = ItemAddress( MenuStrip, MenuNumber )
    D0            A0         D0

    struct MenuItem *ItemAddress( struct Menu *, UWORD );

    FUNCTION
    This routine feels through the specified menu strip and returns the
    address of the item specified by the menu number.  Typically,
    you will use this routine to get the address of a menu item from
    a menu number sent to you by Intuition after user has chosen from
    a window's menus.

       This routine requires that the arguments are well-defined.
    MenuNumber may be equal to MENUNULL, in which case this routine returns
    NULL.  If MenuNumber doesn't equal MENUNULL, it's presumed to be a
    valid item number selector for your menu strip, which includes:
           - a valid menu number
           - a valid item number
           - if the item specified by the above two components has a
             sub-item, the menu number may have a sub-item component, too.

    Note that there must be BOTH a menu number and an item number.
    Because a sub-item specifier is optional, the address returned by
    this routine may point to either an item or a sub-item.

    INPUTS
    MenuStrip = a pointer to the first menu in your menu strip
    MenuNumber = the value which contains the packed data that selects
           the menu and item (and sub-item).  See the Intuition Reference
        Manual for information on menu numbers.

    RESULT
    If MenuNumber == MENUNULL, this routine returns NULL,
    else this routine returns the address of the menu item specified
    by MenuNumber.

    BUGS

    SEE ALSO
    The "Menus" chapter of the Intuition Reference Manual,
    or the Amiga Rom Kernel Manual
intuition.library/LockIBase                       intuition.library/LockIBase

    NAME
    LockIBase -- Invoke semaphore arbitration of IntuitionBase.

    SYNOPSIS
    Lock = LockIBase( LockNumber )
    D0                D0

    ULONG LockIBase( ULONG );

    FUNCTION
    Grabs Intuition internal semaphore so that caller may examine
    IntuitionBase safely.  This function is not a magic "fix all my
    race conditions" panacea.

    The idea here is that you can get the locks Intuition needs before
    such IntuitionBase fields as ActiveWindow and FirstScreen are
    changed, or linked lists of windows and screens are changed.

    Do Not Get Tricky with this entry point, and do not hold these locks
    for long, as all Intuition input processing will wait for you to
    surrender the lock by a call to UnlockIBase().

    NOTE WELL: A call to this function MUST be paired with a subsequent
    call to UnlockIBase(), and soon, please.

    NOTE WELL: Do not call any Intuition functions (nor any graphics,
    layers, dos, or other high-level system function) while
    holding this lock.

    INPUTS
    A long unsigned integer, LockNumber, specifies which of Intuition's
    internal locks you want to get.  This parameter should be zero for all
    forseeable uses of this function, which will let you examine active
    fields and linked lists of screens and windows with safety.

    RESULT
    Returns another ULONG which should be passed to UnlockIBase() to
    surrender the lock gotten by this call.

    BUGS
    This function must not be called while holding any other system locks
    such as layer or LayerInfo locks.

    SEE ALSO
    UnlockIBase(), layers.library/LockLayerInfo(),
    exec.library/ObtainSemaphore()
intuition.library/LockPubScreen               intuition.library/LockPubScreen

    NAME
    LockPubScreen -- Prevent a public screen from closing. (V36)

    SYNOPSIS
    screen = LockPubScreen( Name )
    D0                      A0

    struct Screen *LockPubScreen( UBYTE * );

    FUNCTION
    Prevents a public screen (or the Workbench) from closing
    while you examine it in preparation of opening a visitor window.

    The sequence you use to open a visitor window that needs to
    examine fields in the screen it is about to open on is:
        LockPubScreen()
        ... examine fields ...
        OpenWindow() on public screen
        UnlockPubScreen()
        ... use your window ...
        CloseWindow()

    NOTE
    You needn't hold the "pubscreen lock" for the duration that
    your window is opened.  LockPubScreen() basically has the
    same effect as an open visitor window: it prevents the
    screen from being closed.

    If you pass the string "Workbench" or you pass NULL and there
    is no default public screen, the Workbench screen will
    be automatically opened if it is not already present.

    INPUTS
    Name = name string for public screen or NULL for default public
    screen.  The string "Workbench" indicates the Workbench
    screen.

    RESULT
    Returns pointer to a screen, if successful, else NULL.
    The call can fail for reasons including that the named
    public screen doesn't exist or is in private state.

    BUGS

    SEE ALSO
    OpenWindow(), UnlockPubScreen(), GetScreenData()
intuition.library/LockPubScreenList       intuition.library/LockPubScreenList

    NAME
    LockPubScreenList -- Prevent changes to the system list. (V36)

    SYNOPSIS
    List = LockPubScreenList()
    D0

    struct List *LockPubScreenList( VOID );

    FUNCTION
    Arbitrates access to public screen list    while you quickly
    make a copy of it for display to the user.

    Note that this is intended only for the Public Screen Manager
    program.

    NOTES
    The nodes on the list are PubScreenNode structures.
    Act quickly while holding this lock.  The restrictions
    on LockIBase() apply here as well.

    INPUTS
    None.

    RESULT
    A pointer to the public screen list.

    BUGS

    SEE ALSO
    OpenScreen(), Intuition V36 update documentation
intuition.library/MakeClass                       intuition.library/MakeClass

    NAME
    MakeClass -- Create and initialize a boopsi class. (V36)

    SYNOPSIS
    iclass = MakeClass( ClassID, SuperClassID, SuperClassPtr,
    D0                  A0       A1            A2
        InstanceSize, Flags )
            D0            D1

    struct IClass *MakeClass( UBYTE *, UBYTE *, struct IClass *,
        UWORD, ULONG );

    FUNCTION
    For class implementors only.

    This function creates a new public or private boopsi class.
    The superclass should be defined to be another boopsi class:
    all classes are descendants of the class "rootclass".

    Superclasses can be public or private.  You provide a name/ID
    for your class if it is to be a public class (but you must
    have registered your class name and your attribute ID's with
    Commodore before you do this!).  For a public class, you would
    also call AddClass() to make it available after you have
    finished your initialization.

    Returns pointer to an IClass data structure for your
    class.  You then initialize the Hook cl_Dispatcher for
    your class methods code.  You can also set up special data
    shared by all objects in your class, and point cl_UserData at it.
    The last step for public classes is to call AddClass().

    You dispose of a class created by this function by calling
    FreeClass().

    INPUTS
    ClassID = NULL for private classes, the name/ID string for public
        classes
    SuperClassID = name/ID of your new class's superclass.  NULL if
        superclass is a private class
    SuperClassPtr = pointer to private superclass.  Only used if
        SuperClassID is NULL.  You are required never to provide
        a NULL superclass.
    InstanceSize = the size of the instance data that your class's
        objects will require, beyond that data defined for
        your superclass's objects.
    Flags = for future enhancement, including possible additional
        parameters.  Provide zero for now.

    RESULT
    Pointer to the resulting class, or NULL if not possible:
    - no memory for class data structure
    - public superclass not found
    - public class of same name/ID as this one already exists

    NOTES

    EXAMPLE
    Creating a private subclass of a public class:

    /* per-object instance data defined by my class    */
    struct MyInstanceData {
    ULONG    mid_SomeData;
    };

    /* some useful table I'll share use for all objects */
    UWORD myTable[] = {
    5, 4, 3, 2, 1, 0
    };

    struct IClass    *
    initMyClass()
    {
    ULONG __saveds    myDispatcher();
    ULONG    hookEntry();    /* asm-to-C interface glue    */
    struct IClass    *cl;
    struct IClass    *MakeClass();

    if ( cl =  MakeClass( NULL,
            SUPERCLASSID, NULL,        /* superclass is public      */
            sizeof (struct MyInstanceData),
            0 ))
    {
        /* initialize the cl_Dispatcher Hook    */
        cl->cl_Dispatcher.h_Entry = hookEntry;
        cl->cl_Dispatcher.h_SubEntry = myDispatcher;
        cl->cl_Dispatcher.h_Data = (VOID *) 0xFACE;    /* unused */

        cl-cl_UserData = (ULONG) myTable;
    }
    return ( cl );
    }

    BUGS
    The typedef 'Class' isn't consistently used.  Class pointers
    used blindly should be APTR, or struct IClass for class implementors.

    SEE ALSO
    FreeClass(), AddClass(), RemoveClass(), NewObject(),
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.
intuition.library/MakeScreen                     intuition.library/MakeScreen

    NAME
    MakeScreen -- Do an Intuition-integrated MakeVPort() of a screen.

    SYNOPSIS
    MakeScreen( Screen )
            A0

    VOID MakeScreen( struct Screen * );

    FUNCTION
    This procedure allows you to do a MakeVPort() for the viewport of your
    custom screen in an Intuition-integrated way.  This way you can
    do your own screen manipulations without worrying about interference
    with Intuition's usage of the same viewport.

    The operation of this function is as follows:
        - Block until the Intuition View structure is not in being changed.
        - Set the view modes correctly to reflect if there is a (visible)
          interlaced screen.
        - call MakeVPort(), passing the Intuition View and your screen's
          ViewPort.
        - Unlocks the Intuition View.

    After calling this routine, you should call RethinkDisplay() to
    incorporate the new viewport of your custom screen into the
    Intuition display.

    NOTE: Intuition may determine that because of a change in global
    interlace needs that all viewports need to be remade, so
    it may effectively call RemakeDisplay().

    INPUTS
    Screen = address of the custom screen structure

    RESULT
    None

    BUGS

    SEE ALSO
    RethinkDisplay(), RemakeDisplay(), graphics.library/MakeVPort()
intuition.library/ModifyIDCMP                   intuition.library/ModifyIDCMP

    NAME
    ModifyIDCMP -- Modify the state of a window's IDCMPFlags.

    SYNOPSIS
    [Success =] ModifyIDCMP( Window, IDCMPFlags )
    [D0]                     A0      D0

    [BOOL] ModifyIDCMP( struct Window *, ULONG );
    /* returns BOOL in V37 and greater */

    FUNCTION
    This routine modifies the state of your window's IDCMP (Intuition
    Direct Communication Message Port).  The state is modified to reflect
    your desires as described by the flag bits in the value IDCMPFlags.

    The four actions that might be taken are:

       - if there is currently no IDCMP in the given window, and IDCMPFlags
         is zero, nothing happens
       - if there is currently no IDCMP in the given window, and any of the
         IDCMPFlags is selected (set), then the IDCMP of the window is
         created, including allocating and initializing the message ports
         and allocating a signal bit for your port.  See the "Input and
         Output Methods" chapter of the Intuition Reference Manual for full
      details
       - if the IDCMP for the given window exists, and the
         IDCMPFlags argument is zero, this says that you want
         Intuition to close the ports, free the buffers and free
         your signal bit.  You MUST be the same task that was active
         when this signal bit was allocated (either by ModifyIDCMP()
      or OpenWindow() ).
       - if the IDCMP for the given window is opened, and the IDCMPFlags
         argument is not zero, this means that you want to change the
         state of which events will be broadcast to you through the IDCMP

    NOTE:  You can set up the Window->UserPort to any port of your own
    before you call ModifyIDCMP().  If IDCMPFlags is non-null but
    your UserPort is already initialized, Intuition will assume that
    it's a valid port with task and signal data preset and Intuition
    won't disturb your set-up at all, Intuition will just allocate
    the Intuition message port half of it.  The converse is true
    as well:  if UserPort is NULL when you call here with
    IDCMPFlags == NULL, Intuition will deallocate only the Intuition
    side of the port.

    This allows you to use a port that you already have allocated:
       - OpenWindow() with IDCMPFlags equal to NULL (open no ports)
       - set the UserPort variable of your window to any valid port of your
         own choosing
       - call ModifyIDCMP with IDCMPFlags set to what you want
       - then, to clean up later, set UserPort equal to NULL before calling
         CloseWindow() (leave IDCMPFlags alone)  BUT FIRST: you must make
      sure that no messages sent your window are queued at the port,
      since they will be returned to the memory free pool.

    For an example of how to close a window with a shared IDCMP,
    see the description for CloseWindow().


    INPUTS
    Window = pointer to the Window structure containing the IDCMP ports
    IDCMPFlags = the flag bits describing the new desired state of the IDCMP

    RESULT
    Starting in V37, this function returns NULL if it was unable
    to create the necessary message ports.  (The possibility of
    failure exists in earlier releases, but no return code was offered).
    Do not check the return code under V36 or earlier.

    BUGS

    SEE ALSO
    OpenWindow(), CloseWindow()
intuition.library/ModifyProp                     intuition.library/ModifyProp

    NAME
    ModifyProp -- Modify the current parameters of a proportional gadget.

    SYNOPSIS
    ModifyProp( Gadget, Window, Requester,
            A0        A1        A2
                   Flags, HorizPot, VertPot, HorizBody, VertBody )
            D0       D1         D2          D3     D4

    VOID ModifyProp( struct Gadget *, struct Window *,
        struct Requester *, UWORD, UWORD, UWORD, UWORD, UWORD );

    FUNCTION
    Modifies the parameters of the specified proportional gadget.  The
    gadget's internal state is then recalculated and the imagery
    is redisplayed in the window or requester that contains the gadget.

    The requester variable can point to a requester structure.  If the
    gadget has the GTYP_REQGADGET flag set, the gadget is in a requester
    and the window pointer must point to the window of the requester.
    If this is not the gadget of a requester, the requester argument may
    be NULL.

    NOTE: this function causes all gadgets from the proportional
    gadget to the end of the gadget list to be refreshed, for
    reasons of compatibility.
    For more refined display updating, use NewModifyProp().

    New for V36: ModifyProp() refreshing consists of redrawing gadgets
    completely.  NewModifyProp() has changed this behavior (see
    NewModifyProp()).

    INPUTS
    PropGadget = pointer to a proportional gadget
    Window = pointer to the window containing the gadget or the window
        containing the requester containing the gadget.
    Requester = pointer to a requester (may be NULL if this isn't
        a requester gadget)
    Flags = value to be stored in the Flags field of the PropInfo
    HorizPot = value to be stored in the HorizPot field of the PropInfo
    VertPot = value to be stored in the VertPot field of the PropInfo
    HorizBody = value to be stored in the HorizBody field of the PropInfo
    VertBody = value to be stored in the VertBody field of the PropInfo

    RESULT
    None

    BUGS

    SEE ALSO
    NewModifyProp()
    The Intuition Reference Manual and Amiga Rom Kernel Manual contain
    more information on Proportional Gadgets.
intuition.library/MoveScreen                     intuition.library/MoveScreen

    NAME
    MoveScreen -- Attempt to move the screen by the increments provided.

    SYNOPSIS
    MoveScreen( Screen, DeltaX, DeltaY )
            A0      D0      D1

    VOID MoveScreen( struct Screen *, WORD, WORD );

    FUNCTION
    Moves the screen the specified increment, specified in screen
    pixel resolution coordinates.

    New for V36: Screen movement limits have been greatly relaxed,
    to support screen scrolling.  In particular, negative values
    for screen LeftEdge and TopEdge may now be valid.

       If the DeltaX and DeltaY variables you specify would move the screen
       in a way that violates any restrictions, the screen will be moved
       as far as possible.  You may examine the LeftEdge and TopEdge fields
    of the Screen structure after this function returns to see where
    the screen really ended up.

    In operation, this function determines what the resulting position
    values that are actually to be used, sets these up, and calls
    MakeScreen() and RethinkDisplay().

    INPUTS
    Screen = pointer to a Screen structure
    DeltaX = amount to move the screen on the x-axis
        Note that DeltaX no longer (V36) need be set to zero
    DeltaY = amount to move the screen on the y-axis
        Note that these coordinates are in the same resolution
        as the screen (such as HIRES or INTERLACE)

    RESULT
    None

    BUGS

    SEE ALSO
    RethinkDisplay()
intuition.library/MoveWindow                     intuition.library/MoveWindow

    NAME
    MoveWindow -- Ask Intuition to move a window.

    SYNOPSIS
    MoveWindow( Window, DeltaX, DeltaY )
            A0      D0      D1

    VOID MoveWindow( struct Window *, WORD, WORD );

    FUNCTION
    This routine sends a request to Intuition asking to move the window
    the specified distance.  The delta arguments describe how far to
    move the window along the respective axes.

    Note that the window will not be moved immediately, but rather
    will be moved the next time Intuition receives an input event,
    which happens currently at a minimum rate of ten times per second,
    and a maximum of sixty times a second.

    Interactions with other arbitration of Intuition data structures
    may defer this operation longer.  For V36, you can use the new
    IDCMP class IDCMP_CHANGEWINDOW to detect when this operation has
    completed.

    New for V36: Intuition now will do validity checking on the final
    position.  To send absolute movements, or to move and size a
    window in one step, use ChangeWindowBox().

    INPUTS
    Window = pointer to the structure of the Window to be moved
    DeltaX = how far to move the Window on the x-axis
    DeltaY = how far to move the Window on the y-axis

    RESULT
    None

    BUGS

    SEE ALSO
    ChangeWindowBox(), SizeWindow(), WindowToFront(), WindowToBack()
intuition.library/MoveWindowInFrontOf   intuition.library/MoveWindowInFrontOf

    NAME
    MoveWindowInFrontOf -- Arrange the relative depth of a window. (V36)

    SYNOPSIS
    MoveWindowInFrontOf( Window, BehindWindow )
                 A0      A1

    VOID MoveWindowInFrontOf( struct Window *, struct Window * );

    FUNCTION
    Depth-arranges a window in front of an another window.
    Brings out the layers.library MoveLayerInFrontOf() to the
    Intuition user.

    INPUTS
    Window =  window to re-position in front of another window
    BehindWindow =  window to re-position in front of

    RESULT
    Repositions window.

    BUGS
    Doesn't respect backdrop windows.

    SEE ALSO
    WindowToFront(), WindowToBack(), layers.library/MoveLayerInFrontOf()
intuition.library/NewModifyProp               intuition.library/NewModifyProp

    NAME
    NewModifyProp -- ModifyProp(), but with selective refresh.

    SYNOPSIS
    NewModifyProp( Gadget, Window, Requester, Flags,
               A0      A1      A2         D0
        HorizPot, VertPot, HorizBody, VertBody, NumGad )
        D1        D2       D3         D4        D5

    VOID NewModifyProp( struct Gadget *, struct Window *,
        struct Requester *, UWORD, UWORD, UWORD, UWORD, UWORD, WORD );

    FUNCTION
    Performs the function of ModifyProp(), but refreshes
    gadgets in the list as specified by the NumGad parameter.
    With NumGad = -1, this function is identical to ModifyProp().

    New for V36: When NumGad = 1, this function will now perform
    an incremental update of the proportional gadget knob image,
    rather than refreshing the entire gadget.  This means much
    less flashing when programmatically scrolling a proportional
    gadget.

    INPUTS
    PropGadget = pointer to a proportional gadget
    Window = pointer to the window containing the gadget or the window
        containing the requester containing the gadget.
    Requester = pointer to a requester (may be NULL if this isn't
        a requester gadget)
    Flags = value to be stored in the Flags field of the PropInfo
    HorizPot = value to be stored in the HorizPot field of the PropInfo
    VertPot = value to be stored in the VertPot field of the PropInfo
    HorizBody = value to be stored in the HorizBody field of the PropInfo
    VertBody = value to be stored in the VertBody field of the PropInfo
    NumGad = number of gadgets to be refreshed after propgadget internals
        have been adjusted.  -1 means "to end of list."

    RESULT
    None

    BUGS

    SEE ALSO
    ModifyProp()
    The Intuition Reference Manual contains more information on
    Proportional Gadgets.
intuition.library/NewObject                       intuition.library/NewObject

    NAME
    NewObjectA -- Create an object from a class. (V36)
    NewObject -- Varargs stub for NewObjectA(). (V36)

    SYNOPSIS
    object = NewObjectA( class, classID, tagList )
    D0                   A0     A1       A2

    APTR NewObjectA( struct IClass *, UBYTE *, struct TagItem * );

    object = NewObject( class, classID, Tag1, ... )

    APTR NewObject( struct IClass *, UBYTE *, ULONG, ... );

    FUNCTION
    This is the general method of creating objects from 'boopsi' classes.
    ('Boopsi' stands for "basic object-oriented programming system for
    Intuition".)

    You specify a class either as a pointer (for a private class) or
    by its ID string (for public classes).  If the class pointer
    is NULL, then the classID is used.

    You further specify initial "create-time" attributes for the
    object via a TagItem list, and they are applied to the resulting
    generic data object that is returned.  The attributes, their meanings,
    attributes applied only at create-time, and required attributes
    are all defined and documented on a class-by-class basis.

    INPUTS
    class = abstract pointer to a boopsi class gotten via MakeClass().
    classID = the name/ID string of a public class.  This parameter is
        only used if 'class' is NULL.
    tagList = pointer to array of TagItems containing attribute/value
        pairs to be applied to the object being created

    RESULT
    A boopsi object, which may be used in different contexts such
    as a gadget or image, and may be manipulated by generic functions.
    You eventually free the object using DisposeObject().

    NOTES
    This function invokes the OM_NEW "method" for the class specified.

    BUGS
    Typedef's for 'Object' and 'Class' are defined in the include
    files but not used consistently.  The generic type APTR is
    probably best used for object and class "handles", with the
    type (UBYTE *) used for classID strings.

    SEE ALSO
    DisposeObject(), SetAttrs(), GetAttr(), MakeClass(),
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.

intuition.library/NextObject                     intuition.library/NextObject

    NAME
    NextObject -- iterate through the object on an Exec list. (V36)

    SYNOPSIS
    object = NextObject( objectPtrPtr )
    D0                   A0

    APTR NextObject( APTR );

    FUNCTION
    This function is for boopsi class implementors only.

    When you collect a set of boopsi objects on an Exec List
    structure by invoking their OM_ADDMEMBER method, you
    can (only) retrieve them by iterations of this function.

    Works even if you remove and dispose the returned list
    members in turn.

    INPUTS
    Initially, you set a pointer variable to equal the
    lh_Head field of the list (or mlh_Head field of a MinList).
    You pass the *address* of that pointer repeatedly
    to NextObject() until it returns NULL.

    EXAMPLE

    /* here is the OM_DISPOSE case of some class's dispatcher */
    case OM_DISPOSE:
        /* dispose members    */
        object_state = mydata->md_CollectionList.lh_Head;
        while ( member_object = NextObject( &object_state ) )
        {
        DoMethod( member_object, OM_REMOVE ); /* remove from list */
        DM( member, msg );    /* and pass along dispose    */
        }

    RESULT
    Returns pointers to each object in the list in turn, and NULL
    when there are no more.

    NOTES

    BUGS

    SEE ALSO
    DisposeObject(), SetAttrs(), GetAttr(), MakeClass(),
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.
intuition.library/NextPubScreen               intuition.library/NextPubScreen

    NAME
    NextPubScreen -- Identify next public screen in the cycle. (V36)

    SYNOPSIS
    Buff = NextPubScreen( Screen, NameBuff )
    D0                    A0      A1

    UBYTE *NextPubScreen( struct Screen *, UBYTE * );

    FUNCTION
    Returns name of next public screen in system rotation, to
    allow visitor windows to provide function to "jump" among
    public-screens in a cycle.

    INPUTS
    Screen = pointer to the screen your window is currently open in,
      or NULL, if you don't have a pointer to a public screen.
    NameBuff = pointer to a buffer of MAXPUBSCREENNAME characters,
      for Intuition to fill in with the name of the next public
      screen in rotation.

    RESULT
    Returns NULL if there are no public screens, otherwise a
    pointer to your NameBuff.

    NOTES
    There is no guarantee that the public screen whose name
    was returned by this function will exist or be in "public" state
    by the time you call LockPubScreen(), etc.  You must handle
    cases where LockPubScreen(), etc. will fail.

    BUGS
    The starting screen and cycle order of the public screens isn't
    defined, so do not draw conclusions about the order you
    see in the current version of Intuition.  We reserve the
    right to add meaning to the ordering at a future time.

    SEE ALSO
    OpenScreen(), Intuition V36 update documentation
intuition.library/ObtainGIRPort               intuition.library/ObtainGIRPort

    NAME
    ObtainGIRPort -- Set up a RastPort for a custom gadget. (V36)

    SYNOPSIS
    RPort = ObtainGIRPort( GInfo )
    D0               A0

    struct RastPort *ObtainGIRPort( struct GadgetInfo * );

    FUNCTION
    Sets up a RastPort for use (only) by custom gadget hook routines.
    This function must be called EACH time a hook routine needing
    to perform gadget rendering is called, and must be accompanied
    by a corresponding call to ReleaseGIRPort().

    Note that if a hook function passes you a RastPort pointer,
    e.g., GM_RENDER, you needn't call ObtainGIRPort() in that case.

    INPUTS
    A pointer to a GadgetInfo structure, as passed to each custom
    gadget hook function.

    RESULT
    A pointer to a RastPort that may be used for gadget rendering.
    This pointer may be NULL, in which case you should do no rendering.
    You may (optionally) pass a null return value to ReleaseGIRPort().

    BUGS

    SEE ALSO
    ReleaseGIRPort(), Custom Gadget documentation

intuition.library/OffGadget                       intuition.library/OffGadget

    NAME
    OffGadget -- Disable the specified gadget.

    SYNOPSIS
    OffGadget( Gadget, Window, Requester )
           A0      A1      A2

    VOID OffGadget( struct Gadget *, struct Window *,
        struct Requester * );

    FUNCTION
    This command disables the specified gadget.  When a gadget is
    disabled, these things happen:
         - its imagery is displayed ghosted
         - the GFLG_DISABLED flag is set
         - the gadget cannot be selected by User

    The window parameter must point to the window which contains the
    gadget, or which contains the requester that contains the gadget.
    The requester parameter must only be valid if the gadget has the
    GTYP_REQGADGET flag set, a requirement for all requester gadgets.

       NOTE:  it's never safe to tinker with the gadget list yourself.  Don't
       supply some gadget that Intuition hasn't already processed in
       the usual way.

        NOTE: for compatibility reasons, this function will refresh all
    gadgets in a requester, and all gadgets from gadget to the
    end of the gadget list if gadget is in a window.

    If you want to improve on this behavior, you may perform the
    equivalent operation yourself: remove a gadget or gadgets,
    change the state of their GFLG_DISABLED flag, replace the
    gadgets using AddGList(), and selectively call RefreshGList().

    INPUTS
    Gadget = pointer to the gadget that you want disabled
    Window = pointer to a window structure containing the gadget or
        containing the requester which contains the gadget
    Requester = pointer to a requester (may by NULL if this isn't
           a requester gadget (i.e. GTYP_REQGADGET is not set)).

    RESULT
    None

    BUGS

    SEE ALSO
    AddGadget(), RefreshGadgets()
intuition.library/OffMenu                           intuition.library/OffMenu

    NAME
    OffMenu -- Disable the given menu or menu item.

    SYNOPSIS
    OffMenu( Window, MenuNumber )
         A0      D0

    VOID OffMenu( struct Window *, UWORD );

    FUNCTION
    This command disables a sub-item, an item, or a whole menu.
    This depends on the contents of the data packed into MenuNumber,
    which is described in the Intuition Reference Manual.

    INPUTS
    Window = pointer to the window
    MenuNumber = the menu piece to be disabled

    RESULT
    None

    BUGS

    SEE ALSO
    OnMenu(), ResetMenuStrip()
intuition.library/OnGadget                         intuition.library/OnGadget

    NAME
    OnGadget -- Enable the specified gadget.

    SYNOPSIS
    OnGadget( Gadget, Window, Requester )
          A0      A1      A2

    VOID OnGadget( struct Gadget *, struct Window *,
        struct Requester * );

    FUNCTION
    This command enables the specified gadget.  When a gadget is
    enabled, these things happen:
        - its imagery is displayed normally (not ghosted)
        - the GFLG_DISABLED flag is cleared
        - the gadget can thereafter be selected by the user

    The window parameter must point to the window which contains the
    gadget, or which contains the requester that contains the gadget
    The requester parameter must only be valid if the gadget has the
    GTYP_REQGADGET flag set, a requirement for all requester gadgets.

       NOTE:  it's never safe to tinker with the gadget list yourself.  Don't
       supply some gadget that Intuition hasn't already processed in
       the usual way.

        NOTE: for compatibility reasons, this function will refresh all
    gadgets in a requester, and all gadgets from gadget to the
    end of the gadget list if gadget is in a window.

    If you want to improve on this behavior, you may perform the
    equivalent operation yourself: remove a gadget or gadgets,
    change the state of their GFLG_DISABLED flag, replace the
    gadgets using AddGList(), and selectively call RefreshGList().

    INPUTS
    Gadget = pointer to the gadget that you want disabled
    Window = pointer to a window structure containing the gadget or
        containing the requester which contains the gadget
    Requester = pointer to a requester (may by NULL if this isn't
           a requester gadget (i.e. GTYP_REQGADGET is not set)).

    RESULT
    None

    BUGS

    SEE ALSO

intuition.library/OnMenu                             intuition.library/OnMenu

    NAME
    OnMenu -- Enable the given menu or menu item.

    SYNOPSIS
    OnMenu( Window, MenuNumber )
            A0      D0

    VOID OnMenu( struct Window *, UWORD );

    FUNCTION
    This command enables a sub-item, an item, or a whole menu.
    This depends on the contents of the data packed into MenuNumber,
    which is described in the Intuition Reference Manual.

    INPUTS
    Window = pointer to the window
    MenuNumber = the menu piece to be enables

    RESULT
    None

    BUGS

    SEE ALSO
    OffMenu(), ResetMenuStrip()
intuition.library/OpenScreen                     intuition.library/OpenScreen

    NAME
    OpenScreen -- Open an Intuition screen.

    SYNOPSIS
    Screen = OpenScreen( NewScreen )
    D0             A0

    struct Screen *OpenScreen( struct NewScreen * );

    or

    struct Screen *OpenScreen( struct ExtNewScreen * );

    FUNCTION
    Opens an Intuition screen according to the specified parameters
    found in the NewScreen structure.

    Does all the allocations, sets up the screen structure and all
    substructures completely, and links this screen's viewport into
    Intuition's View structure.

    Before you call OpenScreen(), you must initialize an instance of
    a NewScreen structure.  NewScreen is a structure that contains
    all of the arguments needed to open a screen.  The NewScreen
    structure may be discarded immediately after OpenScreen() returns.

    The SHOWTITLE flag is set to TRUE by default when a screen is opened.
    To change this, you must call the routine ShowTitle().

    INPUTS
    NewScreen = pointer to an instance of a NewScreen structure.

    New for V36:
    In addition to the information contained in the NewScreen structure,
    Intuition now recognizes extended data passed in the form
    of an array of TagItem structures (from <utility/tagitem.h>),
    commonly called a "tag list."

    There are two ways to provide this array.  The first is to
    use the new Intuition entry point OpenScreenTagList() and
    pass the tag list as a parameter.  This is the recommended
    method, and has a convenient format variation for C programs
    using a variable number of arguments.

    An older way used for some V36 development uses the OpenScreen()
    entry point, and an extension of the NewScreen structure named
    ExtNewScreen.  See the documentation of the flag NS_EXTENDED,
    below.

    While we recommend that you use OpenScreenTagList() rather than
    OpenScreen() when using the extension tag list, we document
    the tag ID values here, so that all parameters for opening
    a screen can be found in one place.

    NewScreen is initialized with the following information:
    -------------------------------------------------------------
    Left = initial x-position of your screen (should be zero for
    releases prior to V36)

    Top = initial y-position of the opening screen
    (Note: Left and Top are specified relative to the Intuition's view,
    in same resolution as the screen pixels.)

    Width = the width for this screen's RastPort

    Height = the height for his screen's RastPort, or the constant
        STDSCREENHEIGHT to get the current default height (at
        this time guaranteed to be at least 200 rows).  The normal
        width and height for a particular system is stored by
        the graphics.library in GfxBase->NormalDisplayRows and
        GfxBase->NormalDisplayColumns.  These values will be different
        depending on factors such as PAL video and overscan.

        For V36, a new constant STDSCREENWIDTH is introduced.  It
        serves the similar function for screen width.  Both
        STDSCREENWIDTH and STDSCREENHEIGHT indicate that your
        screen RastPort is to be the same dimensions as your
        DisplayClip rectangle.  If you do not specify either a
        standard or custom DisplayClip, the OSCAN_TEXT region
        will be used, which corresponds to the standard dimensions
        of V35 and earlier.

        Furthermore, if you are using OpenScreenTagList(), and you
        specify STDSCREENWIDTH, and you DO NOT provide a NewScreen
        pointer, and you DO NOT provide SA_Left, then Intuition
        will automatically set the LeftEdge of the screen to
        be the left edge of the screen's DisplayClip region.
        Likewise for STDSCREENHEIGHT and the screen's TopEdge.

    Depth = number of bitplanes

    DetailPen = pen number for details (like gadgets or text in title bar)
        The common value for this pen is 0.

    BlockPen = pen number for block fills (like title bar)
        The common value for this pen is 1.

    Type = screen type values
        Set these flags as desired from the set:
        CUSTOMSCREEN -- this is your own screen, not a system screen.
        CUSTOMBITMAP -- this custom screen has bit maps supplied
        in the bitmap field of the NewScreen structure.  Intuition is
        not to allocate any raster bitmaps.
        SCREENBEHIND -- your screen will be created behind all other open
        screens.  This allows a program to prepare imagery in the
        screen, change its colors, and so on, bringing it to the
        front when it is presentable.
        SCREENQUIET -- Intuition will not render system screen gadgets or
        screen title.  In concert with the WFLG_RMBTRAP flag on all
        your screen's windows, this flag will prevent Intuition from
        rendering into your screen's bitplanes.  Without WFLG_RMBTRAP
        (or using the IDCMP_MENUVERIFY facility to cancel menu
        operations), this flag will prevent Intuition from clearing
        your menu bar, which is probably unacceptable.  The menu bar
        layer may still overwrite  a portion of your screen bitmap
        when the screen is opened.  (V36: it won't clobber your bits
        any more.)
        NS_EXTENDED for this screen to use extended attributes pointed
        to by the 'Extended' field, below.

    ViewModes = the appropriate argument for the data type ViewPort.Modes.
           These include:
           HIRES for this screen to be HIRES width.
           INTERLACE for the display to switch to interlace.
           SPRITES for this screen to use sprites (the pointer
        sprite is always displayed)
           DUALPF for dual-playfield mode (not supported yet)
        [For V36: The ViewModes field is superceded by a TagItem with
        tag value SA_DisplayID.]

    Font = pointer to the default TextAttr structure for text in this
        screen and all windows that open in this screen.  Text that uses
        this TextAttr includes title bars of both screen and windows,
        string gadgets, and menu titles.  Of course, IntuiText that
        specifies a NULL TextAttr field will use the screen/window default
        fonts.  NOTE: Intuition will *NOT* call OpenDiskFont(), so
        the TextAttr you supply must be in memory.  The ways to ensure
        that are to either use a ROM font (Topaz 8 or 9) or first
        call OpenDiskFont() to load the font, and don't close it
        until after your screen is successfully opened.
        [For V36: this is superceded by SA_Font and SA_SysFont.]

    DefaultTitle = pointer to a line of text that will be displayed along
        the screen's title bar.  Null terminated, or just a NULL pointer
           to get no text
        [For V36: superceded by SA_Title.]

    Gadgets = This field should be set to NULL, since no user gadgets may
        be attached to a screen with the current versions of Intuition.

    CustomBitMap = if you're not supplying a custom bitmap, this value is
           ignored.  However, if you have your own display memory that you
           want used for this screen, the CustomBitMap field should point to
        the BitMap structure that describes your display memory.  See the
           "Screens" chapter and the "Amiga ROM Kernel Manual" for more
           information about bitmaps.
        [For V36: this is superceded by SA_BitMap.]

    [ All TagItem extensions below are new for V36.]
    Extension = if NS_EXTENDED is set in NewScreen.Type, this pointer
        should point to an array (or chain of arrays) of TagItems,
        as defined in the include file <utility/tagitem.h>.   This
        field is only defined in the structure ExtNewScreen.
        The values to use for TagItem.ti_Tag are defined below.  We
        recommend that V36-specific applications use the new Intuition
        entry point OpenScreenTagList(), rather than using this field.
        The ExtNewScreen structure is a convenient way to give V36
        Intuition some information that V34 and earlier Intuition will
        ignore.

        Each TagItem is an optional tagged data structure which identifies
        an additional parameter to OpenScreen().  The applicable tag ID
        values for TagItem.ti_Tag and their corresponding data follow.

        Several of the tag items are alternative (and overriding) versions
        to familiar fields in NewScreen.  They are:

    SA_Left
    SA_Top
    SA_Width
    SA_Height
    SA_Depth
    SA_DetailPen
    SA_BlockPen
    SA_Title
    SA_Font
    SA_Type
    SA_BitMap (whose existence also implies CUSTOMBITMAP).

        Several tags are Booleans, which means that depending on whether
        their corresponding ti_Data field is zero (FALSE) or non-zero
        (TRUE), they specify Boolean attributes.  The ones corresponding
        to Boolean flags in the NewScreen.Type field are:

    SA_ShowTitle
    SA_Behind (equiv. to SCREENBEHIND)
    SA_Quiet (equiv. to SCREENQUIET)

        The following tags provide extended information to Intuition
        when creating a screen:

    SA_DisplayID: ti_Data is a 32-bit extended display mode ID
        as defined in <graphics/displayinfo.h>

    SA_Overscan: ti_Data contains a defined constant specifying
        one of the system standard overscan dimensions appropriate for
        the display mode of the screen.  Used with the Width and
        Height dimensions STDSCREENWIDTH and STDSCREEN, this makes
        it trivial to open an overscanned or standard dimension
        screen.  You may also hand-pick your various dimensions
        for overscanned or other screens, by specifying screen position
        and dimensions explicitly, and by using SA_DClip to explicitly
        specify an overscanned DisplayClip region.

        The values for ti_Data of this tag are as follows:

        OSCAN_TEXT - Text Overscan region.  A region which is completely
        on screen and readable ("text safe").  A preferences data
        setting, this is backward equivalent with the old MoreRows,
        and specifies the DisplayClip and default dimensions of the
        Workbench screen.  This is the default.

        OSCAN_STANDARD - Also a preferences setting, this specifies
        a rectangle whose edges are "just out of view."  This yields
        the most efficient position and dimensions of on-monitor
        presentations, such as games and artwork.

        OSCAN_MAX - This is the largest rectangular region that the
        graphics library can handle "comfortably" for a given mode.
        Screens can smoothly scroll (hardware pan) within this region,
        and any DisplayClip or Screen region within this rectangle
        is also legal.  It is not a preferences item, but reflects
        the limits of the graphics hardware and software.

        OSCAN_VIDEO - This is the largest region that the graphics
        library can display, comfortable or not.  There is no guarantee
        that all smaller rectangles are valid.  This region is
        typically out of sight on any monitor or TV, but provides our
        best shot at "edge-to-edge" video generation.

        Remember, using overscan drastically effects memory use and
        chip memory bandwidth.  Always use the smallest (standard)
        overscan region that works for your application.

    SA_DClip: ti_Data is a pointer to a rectangle which explicitly
        defines a DisplayClip region for this screen.  See QueryOverscan()
        for the role of the DisplayClip region.

        Except for overscan display screens, this parameter is
        unnecessary, and specifying a standard value using SA_Overscan
        is normally an easier way to get overscan.

    SA_AutoScroll: this is a Boolean tag item, which specifies that
        this screens is to scroll automatically when the mouse pointer
        reaches the edge of the screen.  The operation of this requires
        that the screen dimensions be larger than its DisplayClip
        region.

    SA_PubName: If this field is present (and ti_Data is non-NULL),
        it means that the screen is a public screen, and that
        the public screen name string is pointed to by ti_Data.
        Public screens are opened in "PRIVATE" mode and must
        be made public using PubScreenStatus().

    SA_Pens: The ti_Data field (if non-NULL) points to a UWORD
        array of pen specification, as defined for struct DrawInfo.
        This array will be used to initialize the screen's
        DrawInfo.dri_Pens array.

        SA_Pens is also used to decide that a screen is ready
        to support the full-blown "new look" graphics.  If you
        want the 3D embossed look, you must provide this tag,
        and the ti_Data value cannot be NULL.  If it points
        to a "minimal" array, containing just the terminator ~0,
        you can specify "new look" without providing any values
        for the pen array.

    The following two tag items specify the task and signal to be issued
    to notify when the last "visitor" window closes on a public screen.
    This support is to assist envisioned public screen manager programs.

    SA_PubTask:  Task to be signalled.  If absent (and SA_PubSig is
        valid), use the task which called OpenScreen() or
        OpenScreenTagList()).

    SA_PubSig:  Data is a UBYTE signal number (not flag) used to notify
        a task when the last visitor window closes on a public screen.

    SA_Colors: ti_Data points to an array of ColorSpec structures
        (terminated with ColorIndex = -1) which specify initial
        values of the screen's color palette.

    SA_FullPalette: this is a Boolean attribute.  Prior to V36, there
        were just 7 RGB color values that Intuition maintained
        in its user preferences (playfield colors 0-3, and colors
        17-19 for the sprite).  When opening a screen, the color
        map for the screens viewport is first initialized by
        graphics (graphics.library/GetColorMap()) then these
        seven values are overridden to take the preferences values.

        In V36, Intuition maintains a full set of 32 preferences colors.
        If you specify TRUE for SA_FullPalette, Intuition will
        override ALL color map entries with its full suite of
        preferred colors.

    SA_ErrorCode: ti_Data points to a ULONG in which Intuition will
        stick an extended error code if OpenScreen[TagList]() fails.
        Values are of this include 0, for success, and:
        OSERR_NOMONITOR    - monitor for display mode not available.
        OSERR_NOCHIPS    - you need newer custom chips for display mode.
        OSERR_NOMEM        - couldn't get normal memory
        OSERR_NOCHIPMEM    - couldn't get chip memory
        OSERR_PUBNOTUNIQUE    - public screen name already used
        OSERR_UNKNOWNMODE    - don't recognize display mode requested

        NOTE: These values are not the same as some similar return
        values defined in graphics.library/ModeNotAvailable().

    SA_SysFont: ti_Data selects one of the system standard fonts
        specified in preferences.  This tag item overrides the
        NewScreen.Font field and the SA_Font tag item.

        Values recognized in ti_Data at present are:
        0 - old DefaultFont, fixed-width, the default.
        1 - Workbench screen preferred font.  You have to
            be very font sensitive to handle a proportional or
            larger than traditional screen font.

        NOTE WELL: if you select sysfont 1, windows opened on
        your screen will not inherit the screen font, but rather
        the window RastPort will be initialized to the old-style
        DefaultFont (sysfont 0).

    RESULT
    If all is well, returns the pointer to your new screen
    If anything goes wrong, returns NULL, with further error
    specification in the variable pointed to by the SA_ErrorCode
    data field (V36 and later).

    NOTE
    By default, AmigaDOS requesters related to your process are put on
    the Workbench screen (these are messages like "Disk Full").  If
    you wish them to show up on custom screens, DOS must be told.
    This fragment shows the procedure.  More information is available
    in the AmigaDOS manuals.  Sample code fragment:

    #include "libraries/dosextens.h"
        ...
    struct Process    *process;
    struct Window    *window;
    APTR        temp;
        ...
        process = (struct Process *) FindTask(NULL);
        temp = process->pr_WindowPtr;    (save old value)
        process->pr_WindowPtr = (APTR) window;
        ( use a pointer to any open window on your screen )
            ...
        your code goes here
            ...
        process->pr_WindowPtr = temp;
        ( restore value BEFORE CloseWindow() )
        CloseWindow(window);

    BUGS

    SEE ALSO
    OpenScreenTagList(), OpenWindow(), PrintIText(), CloseScreen(),
    QueryOverscan() PubScreenStatus(), The Intuition Reference Manual,
    utility/tagitem.h, graphics.library/ModeNotAvailable(),
    diskfont.library/OpenDiskFont(), graphics.library/GetColorMap()
intuition.library/OpenScreenTagList       intuition.library/OpenScreenTagList

   NAME
    OpenScreenTagList -- OpenScreen() with TagItem extension array. (V36)
    OpenScreenTags -- Varargs stub for OpenScreenTagList. (V36)

   SYNOPSIS
    Screen = OpenScreenTagList( NewScreen, TagItems )
    D0                  A0         A1

    struct Screen *OpenScreenTagList( struct NewScreen *,
        struct TagItem * );

    Screen = OpenScreenTags( NewScreen, Tag1, ... )

    struct Screen *OpenScreenTags( struct NewScreen *,
        ULONG, ... );

   FUNCTION
    Provides an extension to the parameters passed to OpenScreen().
    This extensions is in the form of (a pointer to) an array of
    TagItem structures, which have to fields: ti_Tag, an ID identifying
    the meaning of the other field, ti_Data.  See <utility/tagitem.h>.

    The tag items can supplement or override the values in NewScreen.
    In fact, you can pass a NULL value of the NewScreen pointer.
    For that matter, if you pass NULL in both arguments, you'll get
    a screen with defaults in all fields, including display mode,
    depth, colors, dimension, title, and so on.  We ask that
    you at least supply a title when you open a screen.

    See OpenScreen() documentation for parameter specifications.

   INPUTS
     NewScreen     - (optional) pointer to a NewScreen structure.
     TagItems      - (optional) pointer to (an array of) TagItem
            structures, terminated by the value TAG_END.

   RESULT
     Screen    - an open Intuition screen.  See OpenScreen() for
        extended error codes when Screen is returned NULL.

   EXAMPLE
    The version using a variable number of arguments must be
    created for each particular compiler, and may not have
    an analogue in all versions.  For vanilla, 32-bit C
    parameter passing conventions, this works (and will
    appear in amiga.lib):

    struct Screen    *
    OpenScreenTags( ns, tag1 )
    struct NewScreen    *ns;
    ULONG            tag1;
    {
        struct Screen    *OpenScreenTagList();

        return ( OpenScreenTagList( ns, (struct TagItem *) &tag1 ) );
    }

   NOTES
    We recommend this extension to OpenScreen() over using the
    field ExtNewScreen.Extension.  However, the ExtNewScreen.Extension
    is a convenient way to supply a few tags to V36 Intuition which
    will be ignored by V34 Intuition.  See OpenScreen() documentation
    for lots of details.

   BUGS


   SEE ALSO
    OpenScreen()

intuition.library/OpenWindow                     intuition.library/OpenWindow

    NAME
    OpenWindow -- Open an Intuition window.

    SYNOPSIS
       Window = OpenWindow( NewWindow )
    D0                   A0

    struct Window *OpenWindow( struct NewWindow * );

    FUNCTION
    Opens an Intuition window of the given dimensions and position,
    with the properties specified in the NewWindow structure.
    Allocates everything you need to get going.

    New for V36: there is an extensive discussion of public Screens
    and visitor windows at the end of this section.  Also,
    you can provide extensions to the NewWindow parameters using
    and array of TagItem structures.  See the discussion below,
    and the documentation for the function OpenScreenTagList().

    Before you call OpenWindow(), you must initialize an instance of
    a NewWindow structure.  NewWindow is a structure that contains
    all of the arguments needed to open a window.  The NewWindow
    structure may be discarded immediately after it is used to open
    the window.

    If Type == CUSTOMSCREEN, you must have opened your own screen
    already via a call to OpenScreen().  Then Intuition uses your screen
    argument for the pertinent information needed to get your window
    going.  On the other hand, if type == one of the Intuition's standard
    screens, your screen argument is ignored.  Instead,
    Intuition will check to see whether or not that screen
    already exists:  if it doesn't, it will be opened first before
    Intuition opens your window in the standard screen.

    New for V36: If you specify Type == WBENCHSCREEN, then your
    window will appear on the Workbench screen, unless the global
    public screen mode SHANGHAI is set, in which case your window
    will be "hijacked" to the default public screen.  See also
    SetPubScreenModes().

    New for V36: If the WFLG_NW_EXTENDED flag is set, it means that the
    field 'ExtNewWindow->Extension' points to an array of TagItems, as
    defined in intuition/tagitem.h.  This provides an extensible means
    of providing extra parameters to OpenWindow.  For compatibility
    reasons, we could not add the 'Extension' field to the NewWindow
    structure, so we have define a new structure ExtNewWindow, which
    is identical to NewWindow with the addition of the Extension field.

    We recommend that rather than using ExtNewWindow.Extension, you
    use the new Intuition function OpenWindowTagList() and its
    varargs equivalent OpenWindowTags().  We document the window
    attribute tag ID's (ti_Tag values) here, rather than in
    OpenWindowTagList(), so that you can find all the parameters
    for a new window defined in one place.

    If the WFLG_SUPER_BITMAP flag is set, the bitmap variable must point
    to your own bitmap.

    The DetailPen and the BlockPen are used for system rendering; for
    instance, the title bar is first filled using the BlockPen, and then
    the gadgets and text are rendered using DetailPen.  You can either
    choose to supply special pens for your window, or, by setting either
    of these arguments to -1, the screen's pens will be used instead.

    Note for V36: The DetailPen and BlockPen no longer determine
    what colors will be used for window borders, if your window
    opens on a "full-blown new look screen."

    INPUTS
    NewWindow = pointer to an instance of a NewWindow structure.  That
               structure is initialized with the following data:
   -------------------------------------------------------------------------
    Left = the initial x-position for your window
    Top = the initial y-position for your window
    Width = the initial width of this window
    Height = the initial height of this window

    DetailPen = pen number (or -1) for the rendering of window details
         (like gadgets or text in title bar)
    BlockPen = pen number (or -1) for window block fills (like title bar)
    [For V36: Title bar colors are determined otherwise.]

    Flags = specifiers for your requirements of this window, including:
         which system gadgets you want attached to your window:

        - WFLG_DRAGBAR allows this window to be dragged
        - WFLG_DEPTHGADGET lets the user depth-arrange this window
        - WFLG_CLOSEGADGET attaches the standard close gadget
        - WFLG_SIZEGADGET allows this window to be sized.

        If you ask for the WFLG_SIZEGADGET gadget, you must specify one or
        both of the flags WFLG_SIZEBRIGHT and WFLG_SIZEBBOTTOM below; if
        you don't, the default is WFLG_SIZEBRIGHT.  See the following items
        WFLG_SIZEBRIGHT and WFLG_SIZEBBOTTOM for more details.

        - WFLG_SIZEBRIGHT is a special system gadget flag that
          you set to specify whether or not you want the
          RIGHT border adjusted to account for the physical size
          of the sizing gadget.  The sizing gadget must, after
          all, take up room in either the right or bottom border
          (or both, if you like) of the window.  Setting either
          this or the WFLG_SIZEBBOTTOM flag selects which edge
          will take up the slack.  This will be particularly
          useful to applications that want to use the extra space
          for other gadgets (like a proportional gadget and two
          Booleans done up to look like scroll bars) or, for
          for instance, applications that want every possible
          horizontal bit and are willing to lose lines vertically.
          NOTE:  if you select WFLG_SIZEGADGET, you must select
          either WFLG_SIZEBRIGHT or WFLG_SIZEBBOTTOM or both.  If
          you select neither, the default is WFLG_SIZEBRIGHT.
        - WFLG_SIZEBBOTTOM is a special system gadget flag that
          you set to specify whether or not you want the
          BOTTOM border adjusted to account for the physical size
          of the sizing gadget.  For details, refer to
          WFLG_SIZEBRIGHT above.

        - WFLG_GIMMEZEROZERO for easy but expensive output

        what type of window layer you want, either:
        - WFLG_SIMPLE_REFRESH
        - WFLG_SMART_REFRESH
        - WFLG_SUPER_BITMAP

        - WFLG_BACKDROP for whether or not you want this window to be one
          of Intuition's special backdrop windows.  See WFLG_BORDERLESS
          as well.

        - WFLG_REPORTMOUSE for whether or not you want to "listen" to
          mouse movement events whenever your window is the active
          one.  After you've opened your window, if you want to change
          you can later change the status of this via a call to
          ReportMouse().  Whether or not your window is listening to
          mouse is affected by gadgets too, since they can cause you
          to start getting reports too if you like.  The mouse move
          reports (either InputEvents or messages on the IDCMP) that
          you get will have the x/y coordinates of the current mouse
          position, relative to the upper-left corner of your window
          (WFLG_GIMMEZEROZERO notwithstanding).  This flag can work in
          conjunction with the IDCMP Flag called IDCMP_MOUSEMOVE, which
          allows you to listen via the IDCMP.

        - WFLG_BORDERLESS should be set if you want a window with no
          border padding.  Your window may have the border variables
          set anyway, depending on what gadgetry you've requested for
          the window, but you won't get the standard border lines and
          spacing that comes with typical windows.

          This is a good way to take over the entire screen, since you
          can have a window cover the entire width of the screen using
          this flag.  This will work particularly well in conjunction
          with the WFLG_BACKDROP flag (see above), since it allows you
          to open a window that fills the ENTIRE screen.  NOTE:  this is
          not a flag that you want to set casually, since it may cause
          visual confusion on the screen.  The window borders are the
          only dependable visual division between various windows and
          the background screen.  Taking away that border takes away
          that visual cue, so make sure that your design doesn't need
          it at all before you proceed.

        - WFLG_ACTIVATE is the flag you set if you want this window to
          automatically become the active window.  The active
          window is the one that receives input from the keyboard and
          mouse.  It's usually a good idea to to have the window you
          open when your application first starts up be an ACTIVATED
          one, but all others opened later not be ACTIVATED (if the
          user is off doing something with another screen, for
          instance, your new window will change where the input is
          going, which would have the effect of yanking the input rug
          from under the user).  Please use this flag thoughtfully and
          carefully.

          Some notes: First, your window may or may not be active
          by the time this function returns.  Use the IDCMP_ACTIVEWINDOW
          IDCMP message to know when your window has become active.
          Also, be very careful not to mistakenly specify the
          obsolete flag names WINDOWACTIVE or ACTIVEWINDOW.  These are
          used in other contexts, and their values unintentionally added
          to your flags can cause most unfortunate results.  To avoid
          confusion, they are now know as WFLG_WINDOWACTIVE and
          IDCMP_ACTIVEWINDOW.

        - WFLG_RMBTRAP, when set, causes the right mouse button events
          to be trapped and broadcast as events.  You can receive
          these events through either the IDCMP or the console.

        - WFLG_NOCAREREFRESH indicates that you do not wish to
          be responsible for calling BeginRefresh() and EndRefresh()
          when your window has exposed regions (i.e., when the
          IDCMP_REFRESHWINDOW message would be generated).  See also
          the descriptions of these two functions.

        - WFLG_NW_EXTENDED (V36) indicates that NewWindow in fact points
          to an ExtNewWindow structure, and that the 'Extension'
          field points to an array of TagItem structures, with
          meaning described below.

    IDCMPFlags = IDCMP is the acronym for Intuition Direct Communications
        Message Port.  (It's Intuition's sole acronym.) If any of the
        IDCMP Flags is selected, Intuition will create a pair of
        message ports and use them for direct communications with the
        task opening this window (as compared with broadcasting
        information via the Console device).  See the "Input and
        Output Methods" chapter of the Intuition Reference Manual for
        complete details.

        You request an IDCMP by setting any of these flags.  Except
        for the special VERIFY flags, every other flag you set tells
        Intuition that if a given event occurs which your program
        wants to know about, it is to broadcast the details of that
        event through the IDCMP rather than via the Console device.
        This allows a program to interface with Intuition directly,
        rather than going through the Console device.

        Many programs have elected to use IDCMP communication
        exclusively, and not to associate a console with their
        windows at all.  Some operations, such as IDCMP_MENUVERIFY,
        can ONLY be achieved using IDCMP.

            The IDCMP flags you can set are:

        - IDCMP_REQVERIFY is the flag which, like IDCMP_SIZEVERIFY and ...

        - IDCMP_MENUVERIFY (see immediately below), specifies that you
          want to make sure that your graphical state is quiescent
          before something extraordinary happens.  In this case, the
          extraordinary event is that a rectangle of graphical data is
          about to be blasted into your Window.  If you're drawing
          directly into its screen, you probably will wish to make sure
          that you've ceased drawing before the user is allowed to bring
          up the DMRequest you've set up, and the same for when system
          has a request for the user.  Set this flag to ask for that
          verification step.

        - IDCMP_REQCLEAR is the flag you set to hear a message whenever
          a requester is cleared from your window.  If you are using
          IDCMP_REQVERIFY to arbitrate access to your screen's bitmap, it
          is safe to start your output once you have heard an
          IDCMP_REQCLEAR for each IDCMP_REQSET.

        - IDCMP_REQSET is a flag that you set to receive a broadcast
          for each requester that is opened in your window.  Compare
          this with IDCMP_REQCLEAR above.  This function is distinct
          from IDCMP_REQVERIFY.  This functions merely tells you that a
          requester has opened, whereas IDCMP_REQVERIFY requires you to
          respond before the requester is opened.

        - IDCMP_MENUVERIFY is the flag you set to have Intuition stop
          and wait for you to finish all graphical output to your
          window before rendering the menus.  Menus are currently
          rendered in the most memory-efficient way, which involves
          interrupting output to all windows in the screen before the
          menus are drawn.  If you need to finish your graphical
          output before this happens, you can set this flag to make
          sure that you do.

        - IDCMP_SIZEVERIFY means that you will be doing output to your
          window which depends on a knowledge of the current size of the
          window.  If the user wants to resize the window,  you may want
          to make sure that any queued output completes before the sizing
          takes place (critical text, for instance).  If this is the
          case, set this flag.   Then, when the user wants to size,
          Intuition will send you the IDCMP_SIZEVERIFY message and Wait()
          until you reply that it's OK to proceed with the sizing. NOTE:
          when we say that Intuition will Wait() until you reply, what
          we're really saying is that user will WAIT until you reply, which
          suffers the great negative potential of User-Unfriendliness.
          So remember:  use this flag sparingly, and, as always with any
          IDCMP Message you receive, reply to it promptly!  Then, after
          user has sized the window, you can find out about it using
          IDCMP_NEWSIZE.

        With all the "VERIFY" functions, it is not save to leave them
        enabled at any time when your task may not be able to respond
        for a long period.

        It is NEVER safe to call AmigaDOS, directly or indirectly, when
        a "VERIFY" function is active.  If AmigaDOS needs to put up a
        disk requester for you, your task might end up waiting for the
        requester to be satisfied, at the same time as Intuition is
        waiting for your response.  The result is a complete machine
        lockup.  USE ModifyIDCMP() TO TURN OFF ANY VERIFY MESSAGES
        BEFORE CALLING dos.library!!

        For V36: If you do not respond to the verification IntuiMessages
        within the user specified timeout duration, Intuition will abort
        the operation.  This eliminates the threat of these easy
        deadlocks, but can result in a confused user.  Please try
        hard to continue to avoid "logical deadlocks".

        - IDCMP_NEWSIZE is the flag that tells Intuition to send an IDCMP
          message to you after the user has resized your window.  At
          this point, you could examine the size variables in your
          window structure to discover the new size of the window.
          See also the IDCMP_CHANGEWINDOW IDCMP flag.

        - IDCMP_REFRESHWINDOW when set will cause a message to be sent
          whenever your window needs refreshing.  This flag makes
          sense only with WFLG_SIMPLE_REFRESH and WFLG_SMART_REFRESH
          windows.

        - IDCMP_MOUSEBUTTONS will get reports about mouse-button up/down
          events broadcast to you (Note:  only the ones that
          don't mean something to Intuition.  If the user clicks the
          select button over a gadget, Intuition deals with it and you
          don't find out about it through here).

        - IDCMP_MOUSEMOVE will work only if you've set the
          WFLG_REPORTMOUSE flag above, or if one of your gadgets has the
          GACT_FOLLOWMOUSE flag set.  Then all mouse movements will be
          reported here, providing your window is active.

        - IDCMP_GADGETDOWN means that when the User "selects" a gadget
          you've created with the GACT_IMMEDIATE flag set, the fact
          will be broadcast through the IDCMP.

        - IDCMP_GADGETUP means that when the user "releases" a gadget that
          you've created with the GACT_RELVERIFY flag set, the fact
          will be broadcast through the IDCMP.  This message is
          only generated if the release is "good", such as releasing
          the select button over a Boolean gadget, or typing ENTER
          in a string gadget.

        - IDCMP_MENUPICK selects that menu number data will be sent via
          the IDCMP.

        - IDCMP_CLOSEWINDOW means broadcast the IDCMP_CLOSEWINDOW event
          through the IDCMP rather than the console.

        - IDCMP_RAWKEY selects that all IDCMP_RAWKEY events are
          transmitted via the IDCMP.  Note that these are absolutely RAW
          keycodes, which you will have to translate before using.
          Setting this and the MOUSE flags effectively eliminates the need
          to open a Console device to get input from the keyboard and
          mouse.  Of course, in exchange you lose all of the console
          features, most notably the "cooking" of input data and
          the systematic output of text to your window.

        - IDCMP_VANILLAKEY is for developers who don't want the hassle
          of IDCMP_RAWKEYS.  This flag will return all the keycodes after
          translation via the current country-dependent keymap.  When
          you set this flag, you will get IntuiMessages where the Code
          field has a decoded ANSI character code representing the key
          struck on the keyboard.  Only codes that map to a single
          character are returned: you can't read such keys as HELP or
          the function keys with IDCMP_VANILLAKEY.

          NOTE FOR V36: If you have both IDCMP_RAWKEY and IDCMP_VANILLAKEY
          set, Intuition will send an IDCMP_RAWKEY event for those
          *downstrokes* which do not map to single-byte characters
          ("non-vanilla keys).  In this way you can easily detect cursor
          keys, function keys, and the Help key without sacrificing the
          convenience of IDCMP_VANILLAKEY.

        - IDCMP_INTUITICKS gives you simple timer events from Intuition
          when your window is the active one; it may help you avoid
          opening and managing the timer device.  With this flag set,
          you will get only one queued-up INTUITICKS message at a
          time.  If Intuition notices that you've been sent an
          IDCMP_INTUITICKS message and haven't replied to it, another
          message will not be sent.  Intuition receives timer events and
          considers sending you an IDCMP_INTUITICKS message approximately
          ten times a second.

        - IDCMP_DELTAMOVE gives raw (unscaled) input event delta X/Y
          values.  This is so you can detect mouse motion regardless of
          screen/window/display boundaries.  This works a little
          strangely: if you set both IDCMP_MOUSEMOVE and IDCMP_DELTAMOVE.
          IDCMPFlags, you will get IDCMP_MOUSEMOVE messages with delta
          x/y values in the MouseX and MouseY fields of the
          IDCMPMessage.

        - IDCMP_NEWPREFS indicates you wish to be notified when the
          system-wide Preferences changes.  For V36, there is a new
          environment mechanism to replace Preferences, which we
          recommend you consider using instead.

        - Set IDCMP_ACTIVEWINDOW and IDCMP_INACTIVEWINDOW to get messages
          when those events happen to your window.  Take care not to
          confuse this "ACTIVEWINDOW" with the familiar sounding, but
          totally different "WINDOWACTIVE" flag.  These two flags have
          been supplanted by "IDCMP_ACTIVEWINDOW" and "WFLG_WINDOWACTIVE".
          Use the new equivalent terms to avoid confusion.

        - Set IDCMP_DISKINSERTED or IDCMP_DISKREMOVED to learn when
          removable disks are inserted or removed, respectively.

        - IDCMP_IDCMPUPDATE is a new class for V36 which is used as
          a channel of communication from custom and boopsi gadgets
          to your application.

        - IDCMP_CHANGEWINDOW is a new class for V36 that will be sent
          to your window whenever its dimensions or position are changed
          by the user or the functions SizeWindow(), MoveWindow(),
          ChangeWindowBox(), or ZipWindow().

        - IDCMP_MENUHELP is new for V37.  If you specify the WA_MenuHelp
          tag when you open your window, then when the user presses the
          HELP key on the keyboard during a menu session, Intuition will
          terminate the menu session and issue this even in place of an
          IDCMP_MENUPICK message.
        - NEVER follow the NextSelect link for MENUHELP messages.
        - You will be able to hear MENUHELP for ghosted menus.
          (This lets you tell the user why the option is ghosted.)
        - Be aware that you can receive a MENUHELP message whose code
          corresponds to a menu header or an item that has sub-items
          (which does not happen for MENUPICK).  The code may also be
          MENUNULL.
        - LIMITATION:  if the user extend-selects some checkmarked
          items with the mouse, then presses MENUHELP, your
          application will only hear the MENUHELP report.  You
          must re-examine the state of your checkmarks when you
          get a MENUHELP.
        - Availability of MENUHELP in V36 is not directly
          controllable.  We apologize...

    Gadgets = the pointer to the first of a linked list of the your own
          Gadgets which you want attached to this Window.  Can be NULL
          if you have no Gadgets of your own

       CheckMark = a pointer to an instance of the struct Image where can
          be found the imagery you want used when any of your
          menu items is to be checkmarked.  If you don't want to
          supply your own imagery and you want to just use
          Intuition's own checkmark, set this argument to NULL

       Text = a null-terminated line of text to appear on the title bar of
          your window (may be null if you want no text)

       Type = the screen type for this window.  If this equal CUSTOMSCREEN,
          you must have already opened a CUSTOMSCREEN (see text above).
          Types available include:
          - WBENCHSCREEN
          - CUSTOMSCREEN
          - PUBLICSCREEN (new for V36, see text below)

       Screen = if your type is one of Intuition's standard screens, then
          this argument is ignored.  However, if Type == CUSTOMSCREEN,
          this must point to the structure of your own screen

       BitMap = if you have specified WFLG_SUPER_BITMAP as the type of
           refreshing you want for this window, then this value points to a
           instance of the struct bitmap.  However, if the refresh type
           is NOT WFLG_SUPER_BITMAP, this pointer is ignored.

       MinWidth, MinHeight, MaxWidth, MaxHeight = the size limits for this
          window.  These must be reasonable values, which is to say that
          the minimums cannot be greater than the current size, nor can
          the maximums be smaller than the current size.  If they are,
          they're ignored.  Any one of these can be initialized to zero,
          which means that that limit will be set to the current
          dimension of that axis.  The limits can be changed after the
          Window is opened by calling the WindowLimits() routine.

          NOTE: ORIGINALLY, we stated that:

          "If you haven't requested the WFLG_SIZEGADGET option, these
          variables are ignored so you don't have to initialize them."

          It is now clear that a variety of programs take it upon
          themselves to call SizeWindow() (or ChangeWindowBox()) without
          your program's consent or consulting your WFLG_SIZEGADGE
          option.  To protect yourself against the results, we strongly
          urge that if you supply suitable values for these fields even
          if you do not specify WFLG_SIZEGADGET.

          The maximums may be LARGER than the current size, or even
          larger than the current screen.  The maximums should be set to
          the highest value your application can handle.  This allows
          users with larger display devices to take full advantage of
          your software.  If there is no good reason to limit the size,
          then don't.  -1 or ~0 indicates that the maximum size is only
          limited by the size of the window's screen.

          See also the docs on the function WindowLimits() for more
          information.

       Extension (New for V36) = a pointer to an array (or chain of arrays)
        of TagItems to specify additional parameters to OpenWindow().
        TagItems in general are described in utility/tagitem.h,
        and the OpenWindow tags are defined in intuition/intuition.h
        and described here.  For items pertaining to Public Screens
        and visitor windows, please see below.

    Here are the TagItem.ti_Tag values that are defined for OpenWindow
    (and OpenWindowTagList()).

    Certain tags simply override equivalent values in NewWindow,
    and allow you to open a window using OpenWindowTagList() without
    having a NewWindow structure at all.  In each case, cast
    the corresponding data to ULONG and put it in ti_Data.

    The compatible tag items include:

    WA_Left
    WA_Top
    WA_Width
    WA_Height
    WA_DetailPen
    WA_BlockPen
    WA_IDCMP
    WA_Flags    - initial values for Flags before looking at other
            Boolean component Tag values
    WA_Gadgets
    WA_Checkmark
    WA_Title
    WA_CustomScreen - also implies CUSTOMSCREEN property
    WA_SuperBitMap - also implies WFLG_SUPER_BITMAP refresh mode.
    WA_MinWidth
    WA_MinHeight
    WA_MaxWidth
    WA_MaxHeight

    These Boolean tag items are alternatives to the NewWindow.Flags
    Boolean attributes with similar names.

    WA_SizeGadget        - equivalent to WFLG_SIZEGADGET
    WA_DragBar        - equivalent to WFLG_DRAGBAR
    WA_DepthGadget        - equivalent to WFLG_DEPTHGADGET
    WA_CloseGadget        - equivalent to WFLG_CLOSEGADGET
    WA_Backdrop        - equivalent to WFLG_BACKDROP
    WA_ReportMouse        - equivalent to WFLG_REPORTMOUSE
    WA_NoCareRefresh     - equivalent to WFLG_NOCAREREFRESH
    WA_Borderless        - equivalent to WFLG_BORDERLESS
    WA_Activate        - equivalent to WFLG_ACTIVATE
    WA_RMBTrap        - equivalent to WFLG_RMBTRAP
    WA_WBenchWindow        - equivalent to WFLG_WBENCHWINDOW
                  (system PRIVATE)
    WA_SimpleRefresh     - only specify if TRUE
    WA_SmartRefresh     - only specify if TRUE
    WA_SizeBRight        - equivalent to WFLG_SIZEBRIGHT
    WA_SizeBBottom        - equivalent to WFLG_SIZEBBOTTOM
    WA_GimmeZeroZero     - equivalent to WFLG_GIMMEZEROZERO

    The following tag items specify new attributes of a window.

    WA_ScreenTitle - You can specify the screen title associated
        with your window this way, and avoid a call to SetWindowTitles()
        when your window opens.

    WA_AutoAdjust - a Boolean attribute (default FALSE) which says
        that it's OK to move or even shrink the dimensions of
        this window to fit it on the screen, within the dimension
        limits specified by MinWidth and MinHeight.
        Someday, this processing might be sensitive to the
        currently visible portion of the screen the window
        will be opening on, so don't draw too many conclusions
        about the auto-adjust algorithms.

    WA_InnerWidth
    WA_InnerHeight - You can specify the dimensions of the interior
        region of your window, independent of what the border
        thicknesses will be.  You probably want to specify
        WA_AutoAdjust to allow Intuition to move your window
        or even shrink it so that it is completely on screen.

        Note: using these tags puts some reasonable restrictions
        on the gadgets you can specify as "border" gadgets when
        you open your window.  Since border gadgets determine
        the border dimensions and hence the overall dimensions of
        your window, those dimensions cannot be used calculating
        the position or dimensions of border gadgets.

        Here's the complete list of restrictions:
        - GACT_LEFTBORDER gadgets cannot be GFLG_RELWIDTH if
          WA_InnerWidth is used.
        - GACT_RIGHTBORDER gadgets MUST be GFLG_RELRIGHT if
          WA_InnerWidth is used.
        - GACT_TOPBORDER gadgets cannot be GFLG_RELHEIGHT if
          WA_InnerHeight is used.
        - GACT_BOTTOMBORDER gadgets MUST be GFLG_RELBOTTOM if
          WA_InnerHeight is used.

    WA_PubScreenName - This tag item declares that you want your window
        to open as a visitor window on the public screen whose name
        is pointed to by (UBYTE *) ti_Data.

    WA_PubScreen - Open as a visitor window on the public screen
        whose address if provided as (struct Screen *) ti_Data.
        To ensure that this screen remains open long enough, you
        must either:
        1) Be the screen's owner
        2) have another window already open on the screen
        3) use LockPubScreen()
        Using exec.library/Forbid() is not sufficient.

        You can provide ti_Data to be NULL (zero), without any
        of the above precautions, to specify the default public screen.

    WA_PubScreenFallBack - This Boolean attribute specifies that a
        visitor window should "fall back" to opening on the default
        public screen if the explicitly specify public screen is not
        available.

    WA_WindowName - this visionary specification of a window
        rendezvous name string is not yet implemented.

    WA_Colors - this equally great idea about associating a palette
        specification with the active window may not ever be implemented.

    WA_Zoom - ti_Data points to an array of four WORD's to be used
        as the initial Left/Top/Width/Height of the "alternate
        Zoom position and dimensions."  The presence of this tag
        item implies that you want a Zoom gadget, even though you
        might not have a sizing gadget.

    WA_MouseQueue
    WA_RptQueue - These two tags specify limits for the number
        of outstanding IntuiMessages that Intuition will send for
        IDCMP_MOUSEMOVE and repeated IDCMP_RAWKEY, respectively.
        You can change the value of the mouse queue limit after
        the window is open using SetMouseQueue(), but there is
        not currently an equivalent function for the repeat-key queue.

    WA_BackFill - ti_Data is a pointer to a Hook structure that
        the Layers library will call when your window needs
        "backfilling."  See layers.library/InstallLayerHook().

   NOTES
    Regarding Public Screens, you can specify a window to be a
    "visitor window" on a public screen in one of several ways.
    In each case, you must be sure not to specify a NewWindow
    type of CUSTOMSCREEN.  You should use the value PUBLICSCREEN.

    There are actually several ways you can specify which screen
    you want a visitor window to be opened on:

        1) Specify the name of the public screen WA_PubScreenName,
        or a NULL pointer, in ti_Data.  The name might have been
        provided by the user.  A NULL pointer means to use the
        default public screen.

        If the named screen cannot be found, the default public screen
        will be used if the Boolean attribute WA_PubScreenFallBack
        is TRUE.

        2) Specify a pointer to a public screen using the
        WA_PubScreen tag item.  The WA_PubScreenFallBack
        attribute has no effect.  You can specify the default
        public screen by providing a NULL pointer.

        You can also specify the pointer by setting NewWindow.Type
        to PUBLICSCREEN, and specifying the public screen pointer
        in NewWindow.Screen.  The WA_PubScreen tag item has precedent
        over this technique.

        Unless NULL, the screen pointer provided MUST be a valid
        public screen.  You may ensure this several ways:

        - Be the owner of the screen.
        - Have a window already open on the screen.
        - Use LockPubScreen() to prevent the screen from closing.
        - specifying the WFLG_VISITOR bit in NewWindow.Flags is not
          supported.

        It is anticipated that the last will be the most common method
        of opening public screens because you often want to examine
        properties of the screen your window will be using in order
        to compensate for differences in dimension, depth, and font.

        The standard sequence for this method is as follows:
        LockPubScreen()    - obtain a pointer and a promise
        layout window    - adapt your window to the screen you will use
        OpenWindow()    - using the pointer you specify
        UnlockPubScreen()    - once your window is open, you can let go
                  of the lock on the public screen
        ... normal window even processing ...
        CloseWindow().

    Regarding "service" windows, such as those opened for a system
    requester or file requester associated with a given "client"window.
    These windows should NOT be "visitor" windows.  Open them
    using NewWindow.Type = CUSTOMSCREEN and NewWindow.Screen
    equal to the screen of the client window (window->WScreen).
    You can also use WA_CustomScreen, which has precedence.

    This ensures that the requester service window will be allowed to
    open on the same screen as the client window, even if that
    screen is not a public screen, or has private status.

    This has an implication for service/client protocol: when you
    pass a window pointer to any system requester routine or
    to a routine which creates some other other service window,
    you MUST keep your window open until the client window
    is closed.

    If a requester service will allow a NULL client window, this
    should indicate to open the service window on the default public
    screen (probably Workbench).  The correct way to get a pointer
    to this screen is to call LockPubScreen( NULL ).  In this
    case, you want to open as a visitor window, which means you
    should use either PUBLICSCREEN or WA_PubScreen, described above.
    You should call UnlockPubScreen() after your visitor window is open.

    As of V36, gadgets in the right and bottom border
    (specified with GACT_RIGHTBORDER and GACT_BOTTOMBORDER) only
    contribute to the dimensions of the borders if they are also
    GFLG_RELRIGHT and GFLG_RELBOTTOM, respectively.

    RESULT
    If all is well, returns the pointer to your new Window
    If anything goes wrong, returns NULL

    BUGS
    When you open a window, Intuition will set the font of
    the window's RastPort to the font of the window's screen.
    This does not work right for GimmeZeroZero windows: the
    BorderRPort RastPort has the font set correctly, but
    Window.RPort is set up with the system default font.
    For compatibility reasons, we won't be fixing this problem.

    Also, there is a compatibility trick going on with the
    default font of your window's RastPort if the screen's
    font is "fancy."  See the SA_SysFont attribute described
    under OpenScreen().

    Unless you arrange otherwise, each window you open will allocate
    a signal for your task from the 16 "user signals."
    If no signal is available, your window will not be able
    to be opened.  In early V36 versions and before, Intuition didn't
    check this condition, but just left you with an unusable port.

    SEE ALSO
       OpenWindowTagList(), OpenScreen(), ModifyIDCMP(), SetWindowTitles(),
    LockPubScreen(), SetDefaultPubScreen(), ZipWindow(),
    layers.library/InstallLayerHook(), SetPubScreenModes()
intuition.library/OpenWindowTagList       intuition.library/OpenWindowTagList

   NAME
    OpenWindowTagList -- OpenWindow() with TagItem extension. (V36)
    OpenWindowTags -- Varargs stub for OpenWindowTagList (V36)

   SYNOPSIS
    Window = OpenWindowTagList( NewWindow, TagItems )
    D0                  A0         A1

    struct Window *OpenWindowTagList( struct NewWindow *,
        struct TagItem * );

    Window = OpenWindowTags( NewWindow, Tag1, ... )

    struct Window *OpenWindowTags( struct NewWindow *, ULONG, ... );

   FUNCTION
    A variation of OpenWindow() that allow direct specification of
    a TagItem array of extension data.  Recommended over using the
    ExtNewWindow.Extension field.

    If you omit the NewWindow (pass NULL), a set of defaults
    are used, and overridden by the tag items.  Even without
    any tag items at all, a reasonable window opens on the Workbench
    or default public screen.

    See OpenWindow() for all the details.

   INPUTS
     NewWindow - (optional) pointer to a NewWindow structure.
    TagItems - (optional) pointer to TagItem array, with tag
        values as described under the description for
        OpenWindow().

   RESULT
     Window - newly created window, per your specifications.

   EXAMPLE
    See OpenScreenTagList() for an example of how to create
    a "varargs" version of this function for convenient C
    language programming.

   NOTES


   BUGS


   SEE ALSO
    OpenWindow()

intuition.library/OpenWorkBench               intuition.library/OpenWorkBench

    NAME
    OpenWorkBench -- Open the Workbench screen.

    SYNOPSIS
    WBScreen = OpenWorkBench()
    D0

    BOOL OpenWorkBench( VOID );

    FUNCTION
    This routine attempts to reopen the Workbench.  The actions taken are:
        - general good stuff and nice things, and then return a non-null
          pointer to the Workbench screen.
        - find that something has gone wrong, and return NULL

    The return value, if not NULL, is indeed the address of the Workbench
    screen, although you should not use it as such.  This is because the
    Workbench may be closed by other programs, which can invalidate
    the address at any time.  We suggest that you regard the return
    value as a BOOL indication that the routine has succeeded, if
    you pay any attention to it at all.

    INPUTS
    None

    RESULT
    non-zero if Workbench screen opened successfully, or was already
        opened
    FALSE if anything went wrong and the Workbench screen isn't out there

    BUGS
    The name of this routine is spelled wrong: it should be
    OpenWorkbench

    SEE ALSO

intuition.library/PointInImage                 intuition.library/PointInImage

   NAME
    PointInImage -- Tests whether an image "contains" a point. (V36)

   SYNOPSIS
    DoesContain = PointInImage( Point, Image )
    D0                  D0     A0

    BOOL PointInImage( struct Point, struct Image * );

   FUNCTION
    Tests whether a point is properly contained in an image.
    The intention of this is to provide custom gadgets a means
    to delegate "image mask" processing to the Image, where
    it belongs (superceding things like BOOLMASK).  After all,
    a rounded rect image with a drop shadow knows more about
    what points are inside it than anybody else should.

    For traditional Intuition Images, this routine checks if
    the point is in the Image box (LeftEdge/RightEdge/Width/Height).

   INPUTS
     Point    - Two words, X/Y packed into a LONG, with high word
        containing 'X'.  This is what you get if you pass
        a Point structure (not a pointer!) using common
        C language parameter conventions.
    Image - a pointer to a standard or custom Image data object.
        NOTE: If 'Image' is NULL, this function returns TRUE.

   RESULT
     DoesContain - Boolean result of the test.

   EXAMPLE


   NOTES


   BUGS
    Only applies to the first image, does not follow NextImage
    linked list.  This might be preferred.

   SEE ALSO


intuition.library/PrintIText                     intuition.library/PrintIText

    NAME
    PrintIText -- Print text described by the IntuiText argument.

    SYNOPSIS
    PrintIText( RastPort, IText, LeftOffset, TopOffset )
            A0        A1     D0          D1

    VOID PrintIText( struct RastPort *, struct IntuiText *, WORD, WORD );

    FUNCTION
    Prints the IntuiText into the specified RastPort.  Sets up the RastPort
    as specified by the IntuiText values, then prints the text into the
    RastPort at the IntuiText x/y coordinates offset by the left/top
    arguments.  Note, though, that the IntuiText structure itself
    may contain further text position coordinates: those coordinates
    and the Left/TopOffsets are added to obtain the true position of
    the text to be rendered.

    This routine does window layer clipping as appropriate -- if you
    print text outside of your window, your characters will be
    clipped at the window's edge, providing you pass your window's
    (layered) RastPort.

    If the NextText field of the IntuiText argument is non-NULL,
    the next IntuiText is rendered as well, and so on until some
    NextText field is NULL.

    IntuiText with the ITextFont field NULL are displayed in the
    font of the RastPort.  If the RastPort font is also NULL, the
    system default font, as set via the Preferences tool, will be used.

    INPUTS
    RastPort = the RastPort destination of the text
    IText = pointer to an instance of the structure IntuiText
    LeftOffset = left offset of the IntuiText into the RastPort
    TopOffset = top offset of the IntuiText into the RastPort

    RESULT
    None

    BUGS

    SEE ALSO

intuition.library/PubScreenStatus           intuition.library/PubScreenStatus

    NAME
    PubScreenStatus -- Change status flags for a public screen. (V36)

    SYNOPSIS
    ResultFlags = PubScreenStatus( Screen, StatusFlags )
    D0                      A0      D0

    UWORD PubScreenStatus( struct Screen *, UWORD );

    FUNCTION
    Changes status flags for a given public screen.

    Do not apply this function to a screen if your program
    isn't the screen's "owner", in particular, don't call
    this function for the Workbench screen.

    INPUTS
    Screen = pointer to public screen
    StatusFlags = values currently:
      PSNF_PRIVATE: make this screen unavailable to visitor windows

    RESULT
    Returns 0 in the lowest order bit of the return value
    if the screen wasn't public, or because it can not be taken
    private because visitors are open in it.

    All other bits in the return code are reserved for future
    enhancement.

    BUGS

    SEE ALSO
    OpenScreen(), Intuition V36 update documentation
intuition.library/QueryOverscan               intuition.library/QueryOverscan

    NAME
    QueryOverscan -- Inquire about a standard overscan region. (V36)

    SYNOPSIS
    success = QueryOverscan( DisplayID, Rect, OScanType )
    D0                       A0         A1    D0

    LONG QueryOverscan( ULONG, struct Rectangle *, WORD );

    FUNCTION
    This function fills in a rectangle with one of the system
    overscan dimensions, scaled appropriately for the mode of
    the DisplayID it is passed.

    There are three types of system overscan values:
    OSCAN_TEXT: completely visible, by user preference.  Used
      for Workbench screen and screen dimensions STDSCREENWIDTH
      and STDSCREENHEIGHT.  Left/Top is always 0,0.
    OSCAN_STANDARD: just beyond visible bounds of monitor, by
      user preference.  Left/Top may be negative.
    OSCAN_MAX: The largest region we can display, AND display
      any smaller region (see note below).
    OSCAN_VIDEO: The absolute largest region that the graphics.library
      can display.  This region must be used as-is.


    INPUTS
    DisplayID -- A 32-bit identifier for a display mode, as
      defined in graphics/displayinfo.h.

      NOTE: If you only intend to use one of the four standard
      overscan dimensions as is, and open your screen to exactly
      the DisplayClip dimensions, you can specify one of
      the OSCAN_ values in the ExtNewScreen tag SA_StdDClip,
      and specify STDSCREENWIDTH and STDSCREENHEIGHT as the
      dimensions to more easily open up an overscanned screen
      (or use no NewScreen in OpenScreenTagList() and accept
      the default standard screen dimensions).

    Rect -- pointer to a Rectangle structure which this function
      will fill out with its return values.  Note that to convert
      a rectangle to a screen "Height" you do (MaxY - MinY + 1), and
      similarly for "Width."  The rectangle may be passed directly
      to OpenScreen() as a DisplayClip region (SA_DClip).

    RESULT
    0 (FALSE) if the MonitorSpec your NewScreen requests
    does not exist.  Non-zero (TRUE) if it does.

    BUGS
    Change in parameter V36.A17 might cause problems for some.

    SEE ALSO
    OpenScreen(), Intuition V36 update documentation
intuition.library/RefreshGadgets             intuition.library/RefreshGadgets

    NAME
    RefreshGadgets -- Refresh (redraw) the gadget display.

    SYNOPSIS
    RefreshGadgets( Gadgets, Window, Requester )
                A0       A1      A2

    VOID RefreshGadgets( struct Gadget *, struct Window *,
        struct Requester * );

    FUNCTION
    Refreshes (redraws) all of the gadgets in the gadget list starting
    from the specified gadget.

    The window parameter must point to the window which contains the
    gadget, or which contains the requester that contains the gadget
    The requester parameter must only be valid if the gadget has the
    GTYP_REQGADGET flag set, a requirement for all requester gadgets.

    The Pointer argument points to a Window structure.

    The two main reasons why you might want to use this routine are:
    first, that you've modified the imagery of the gadgets in your
    display and you want the new imagery to be displayed; secondly,
    if you think that some graphic operation you just performed
    trashed the gadgetry of your display, this routine will refresh
    the imagery for you.

    Note that to modify the imagery of a gadget, you must first remove
    that gadget from the window's gadget list, using RemoveGadget() (or
    RemoveGList()).  After changing the image, border, text (including
    text for a string gadget), the gadget is replaced in the gadget list
    (using AddGadget() or AddGList()).  Adding gadgets does not cause
    them to be displayed (refreshed), so this function, or RefreshGList()
    is typically called.

    A common technique is to set or reset the GFLG_SELECTED flag of a
    Boolean gadget and then call RefreshGadgets() to see it displayed
    highlighted if and only if GFLG_SELECTED is set.  If you wish to do
    this and be completely proper, you must RemoveGadget(), change the
    GFLG_SELECTED flag, AddGadget(), and RefreshGadgets(), or the
    equivalent.

    The gadgets argument can be a copy of the FirstGadget variable in
    the Window structure that you want refreshed:
    the effect of this will be that all gadgets will be redrawn.
    However, you can selectively refresh just some of the gadgets
    by starting the refresh part-way into the list:  for instance,
    redrawing your window non-GTYP_GZZGADGET gadgets only, which you've
    conveniently grouped at the end of your gadget list.

    Even more control is available using the RefreshGList() routine which
    enables you to refresh a single gadget, or number of your choice.

    NOTE:  It's never safe to tinker with the gadget list yourself.  Don't
    supply some gadget list that Intuition hasn't already processed in
    the usual way.

    INPUTS
    Gadgets = pointer to the first in the list of gadgets wanting
        refreshment
    Window = pointer to the window containing the gadget or its requester
    Requester = pointer to a requester (ignored if gadget is not attached
        to a requester).

    RESULT
    None

    BUGS

    SEE ALSO
    RefreshGList(), RemoveGadget(), RemoveGList(), AddGadget(), AddGList()
intuition.library/RefreshGList                 intuition.library/RefreshGList

    NAME
    RefreshGList -- Refresh (redraw) a chosen number of gadgets.

    SYNOPSIS
    RefreshGList( Gadgets, Window, Requester, NumGad )
              A0       A1      A2         D0

    VOID RefreshGList( struct Gadget *, struct Window *,
        struct Requester *, WORD );

    FUNCTION
    Refreshes (redraws) gadgets in the gadget list starting
    from the specified gadget.  At most NumGad gadgets are redrawn.
    If NumGad is -1, all gadgets until a terminating NULL value
    in the NextGadget field is found will be refreshed, making this
    routine a superset of RefreshGadgets().

    The Requester parameter can point to a Requester structure.  If
    the first gadget in the list has the GTYP_REQGADGET flag set, the
    gadget list refers to gadgets in a requester and the pointer
    must necessarily point to a window.  If these are not the gadgets
    of a requester, the requester argument may be NULL.

    Be sure to see the RefreshGadgets() function description, as this
    function is simply an extension of that.

    INPUTS
    Gadgets = pointer to the first in the list of gadgets wanting
        refreshment
    Window = pointer to the window containing the gadget or its requester
    Requester = pointer to a requester (ignored if Gadget is not attached
        to a Requester).
    NumGad  = maximum number of gadgets to be refreshed.  A value of -1
      will cause all gadgets to be refreshed from gadget to the
      end of the list.  A value of -2 will also do this, but if 'Gadgets'
      points to a Requester Gadget (GTYP_REQGADGET) ALL gadgets in the
      requester will be refreshed (this is a mode compatible with v1.1
      RefreshGadgets().)

    RESULT
    None

    BUGS

    SEE ALSO
    RefreshGadgets()
intuition.library/RefreshWindowFrame     intuition.library/RefreshWindowFrame

    NAME
    RefreshWindowFrame -- Ask Intuition to redraw your window border.

    SYNOPSIS
    RefreshWindowFrame( Window )
                A0

    VOID RefreshWindowFrame( struct Window * );

    FUNCTION
    Refreshes the border of a window, including title region and all
    of the window's gadgets.

    You may use this call if you wish to update the display of your borders.
    The expected use of this is to correct unavoidable corruption.

    INPUTS
    Window = a pointer to a Window structure

    RESULT
    None

    BUGS

    SEE ALSO

intuition.library/ReleaseGIRPort             intuition.library/ReleaseGIRPort

    NAME
    ReleaseGIRPort -- Release a custom gadget RastPort. (V36)

    SYNOPSIS
    ReleaseGIRPort( RPort )
            A0

    VOID ReleaseGIRPort( struct RastPort * );

    FUNCTION
    The corresponding function to ObtainGIRPort(), it releases
    arbitration used by Intuition for gadget RastPorts.

    INPUTS
    Pointer to the RastPort returned by ObtainGIRPort().
    This pointer can be NULL, in which case nothing happens.

    RESULT
    None

    BUGS

    SEE ALSO
    ObtainGIRPort(), Custom Gadget documentation
intuition.library/RemakeDisplay               intuition.library/RemakeDisplay

    NAME
    RemakeDisplay -- Remake the entire Intuition display.

    SYNOPSIS
    RemakeDisplay()

    VOID RemakeDisplay( VOID );

    FUNCTION
    This is the big one.

    This procedure remakes the entire View structure for the
    Intuition display.  It does the equivalent of MakeScreen() for
    every screen in the system, and then it calls the internal
    equivalent of RethinkDisplay().

    WARNING:  This routine can take many milliseconds to run, so
    do not use it lightly.

    Calling MakeScreen() followed by RethinkDisplay() is typically
    a more efficient method for affecting changes to a single
    screen's ViewPort.

    INPUTS
    None

    RESULT
    None

    BUGS

    SEE ALSO
    MakeScreen(), RethinkDisplay(), graphics.library/MakeVPort()
    graphics.library/MrgCop(), graphics.library/LoadView()
intuition.library/RemoveClass                   intuition.library/RemoveClass

    NAME
    RemoveClass -- Make a public boopsi class unavailable. (V36)

    SYNOPSIS
    RemoveClass( classPtr )
             A0

    VOID RemoveClass( struct IClass * );

    FUNCTION
    Makes a public class unavailable for public consumption.
    It's OK to call this function for a class which is not
    yet in the internal public class list, or has been
    already removed.

    INPUTS
    ClassPtr = pointer to *public* class created by MakeClass(),
        may be NULL.

    RESULT
    None.

    NOTES

    BUGS

    SEE ALSO
    MakeClass(), FreeClass(), AddClass()
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.

intuition.library/RemoveGadget                 intuition.library/RemoveGadget

    NAME
    RemoveGadget -- Remove a gadget from a window.

    SYNOPSIS
    Position = RemoveGadget( Window, Gadget )
    D0             A0      A1

    UWORD RemoveGadget( struct Window *, struct Gadget * );

    FUNCTION
    Removes the given gadget from the gadget list of the specified
    window.  Returns the ordinal position of the removed gadget.

    If the gadget is in a requester attached the the window, this
    routine will look for it and remove it if it is found.

    If the gadget pointer points to a gadget that isn't in the
    appropriate list, -1 is returned.  If there aren't any gadgets in the
    list, -1 is returned.  If you remove the 65535th gadget from the list
    -1 is returned.

    NOTES
    New with V37: If one of the gadgets you wish to remove
    is the active gadget, this routine will wait for the user
    to release the mouse button before deactivating and removing
    the gadget.

    INPUTS
    Window = pointer to the window containing the gadget or the requester
        containing the gadget to be removed.
    Gadget = pointer to the gadget to be removed.  The gadget itself
        describes whether this is a gadget that should be removed from the
        window or some requester.

    RESULT
    Returns the ordinal position of the removed gadget.  If the gadget
    wasn't found in the appropriate list, or if there are no gadgets in
    the list, returns -1.

    BUGS

    SEE ALSO
    AddGadget(), AddGList(), RemoveGList()
intuition.library/RemoveGList                   intuition.library/RemoveGList

    NAME
    RemoveGList -- Remove a sublist of gadgets from a window.

    SYNOPSIS
    Position = RemoveGList( Window, Gadget, Numgad )
    D0            A0    A1    D0

    UWORD RemoveGList( struct Window *, struct Gadget *, WORD );

    FUNCTION
    Removes 'Numgad' gadgets from the gadget list of the specified
    window.  Will remove gadgets from a requester if the first
    gadget's GadgetType flag GTYP_REQGADGET is set.

    Otherwise identical to RemoveGadget().

    NOTE
    The last gadget in the list does NOT have its link zeroed.
    New with V36: OK, last gadget's NextGadget field is set to NULL.

    New with V37: If one of the gadgets you wish to remove
    is the active gadget, this routine will wait for the user
    to release the mouse button before deactivating and removing
    the gadget.

    INPUTS
    Window = pointer to the window containing the gadget or the requester
        containing the gadget to be removed.
    Gadget = pointer to the gadget to be removed.  The gadget itself
           describes whether this is a gadget that should be removed
           from the window or some requester.
    Numgad = number of gadgets to be removed.  If -1, remove all gadgets
        to end of window gadget list

    RESULT
    Returns the ordinal position of the removed gadget.  If the gadget
    wasn't found in the appropriate list, or if there are no gadgets in
    the list, returns -1.

    BUGS

    SEE ALSO
    RemoveGadget(), AddGadget(), AddGList()
intuition.library/ReportMouse                   intuition.library/ReportMouse
    NAME
    ReportMouse -- Tell Intuition whether to report mouse movement.

    SYNOPSIS
    ReportMouse( Boolean, Window )
             D0       A0    <-note

    VOID ReportMouse( BOOL, struct Window * );

    SPECIAL NOTE
    Some compilers and link files switch the arguments to this function
    about in unpredictable ways.  We apologize for this confusion
    wrapped around an error enclosing a mistake.
    The call will take one of two forms:

        ReportMouse(Boolean, Window);
            -or-
        ReportMouse(Window, (ULONG)Boolean);

    The first form is the one that corresponds to the amiga.lib supplied
    by Commodore.  The linker libraries and "pragmas" of some compilers
    supply the alternate form.

    A key point to remember is that the form of the function in ROM
    has always been the same, so there has always been object code
    compatibility.  However some care should be taken when switching
    compilers or switching between stubs and pragmas.

    From assembler the interface has always been:
        Boolean in D0, Window in A0

    Also, it is still endorsed to simply set the WFLG_REPORTMOUSE flag bit
    in Window->Flags, or reset it, on your own.  Make the operation
    an atomic assembly instruction (OR.W #WFLG_REPORTMOUSE,wd_Flags+2(A0)
    where A0 contains your window pointer).  Most compilers will produce
    an atomic operation when faced with:
            Window->Flags |= WFLG_REPORTMOUSE;
            Window->Flags &=~WFLG_REPORTMOUSE;
    or else bracket the operation between Forbid()/Permit().

    FUNCTION
    Tells Intuition whether or not to broadcast mouse-movement events to
    your window when it's the active one.  The Boolean value specifies
    whether to start or stop broadcasting position information of
    mouse-movement.  If the window is the active one, mouse-movement reports
    start coming immediately afterwards.  This same routine will change
    the current state of the GACT_FOLLOWMOUSE function of a
    currently-selected gadget too.

    Note that calling ReportMouse() when a gadget is selected will only
    temporarily change whether or not mouse    movements are reported while
    that gadget remains selected; the next time the gadget is selected, its
    GACT_FOLLOWMOUSE flag is examined anew.

    Note also that calling ReportMouse() when no gadget is currently
    selected will change the state of the window's WFLG_REPORTMOUSE flag,
    but will have no effect on any gadget that may be subsequently
    selected. (This is all fixed in V36.)

    The ReportMouse() function is first performed when OpenWindow()
    is first called; if the flag WFLG_REPORTMOUSE is included among
    the options, then all mouse-movement events are reported
    to the opening task and will continue to be reported
    until ReportMouse() is called with a Boolean value of FALSE.
    If WFLG_REPORTMOUSE is not set, then no mouse-movement reports will
    be broadcast until ReportMouse() is called with a Boolean of TRUE.

    Note that the WFLG_REPORTMOUSE flag, as managed by this routine,
    determines IF mouse messages are to be broadcast.  Determining HOW
    they are to be broadcast is determined by the IDCMP_MOUSEMOVE
    IDCMPFlag.

    INPUTS
    Window = pointer to a Window structure associated with this request
    Boolean = TRUE or FALSE value specifying whether to turn this
             function on or off

    RESULT
    None

    BUGS
    See above

    SEE ALSO
    The Input and Output section of the Intuition Reference Manual
intuition.library/Request                           intuition.library/Request

    NAME
    Request -- Activate a requester.

    SYNOPSIS
    Success = Request( Requester, Window )
    D0           A0         A1

    BOOL Request( struct Requester *, struct Window * );

    FUNCTION
    Links in and displays a requester into the specified window.

    This routine ignores the window's IDCMP_REQVERIFY flag.

    INPUTS
    Requester = pointer to the requester to be displayed
    Window = pointer to the window into which this requester goes

    New for V36: the POINTREL flag now has meaning if the requester
    is not a DMR (Double-Menu Requester):
    If POINTREL is set this requester should be placed in the center
    of the window, offset by Requester.RelLeft and Requester.RelTop.
    If the requester doesn't fit in the window, its position will be
    adjusted to show the upper-left corner.

    RESULT
    If the requester is successfully opened, TRUE is returned.  Otherwise,
    if the requester could not be opened, FALSE is returned.

    BUGS
    There is a maximum of 8 requesters that are supported in
    a window that can be changed in size, position, or depth.

    SEE ALSO
    The Requesters section of the Intuition Reference Manual
intuition.library/ResetMenuStrip             intuition.library/ResetMenuStrip

    NAME
    ResetMenuStrip -- Re-attach a menu strip to a window. (V36)

    SYNOPSIS
    Success = ResetMenuStrip( Window, Menu )
    D0                  A0      A1

    BOOL ResetMenuStrip( struct Window *, struct Menu * );

    FUNCTION
    This function is simply a "fast" version of SetMenuStrip() that
    doesn't perform the precalculations of menu page sizes that
    SetMenuStrip() does.

    You may call this function ONLY IF the menu strip and all items
    and sub-items have not changed since the menu strip was passed to
    SetMenuStrip(), with the following exceptions:

    - You may change the CHECKED flag to turn a checkmark on or off.
    - You may change the ITEMENABLED flag to enable/disable some
      MenuItem or Menu structures.

    In all other ways, this function performs like SetMenuStrip().

    The new sequence of events you can use is:
    - OpenWindow()
    - SetMenuStrip()
    zero or more iterations of:
        - ClearMenuStrip()
        - change CHECKED or ITEMENABLED flags
        - ResetMenuStrip()
    - ClearMenuStrip()
    - CloseWindow()

    INPUTS
    Window = pointer to a Window structure
    Menu = pointer to the first menu in the menu strip

    RESULT
    TRUE always.

    BUGS

    SEE ALSO
    SetMenuStrip(), ClearMenuStrip()
intuition.library/RethinkDisplay             intuition.library/RethinkDisplay

    NAME
    RethinkDisplay -- Grand manipulation of the entire Intuition display.

    SYNOPSIS
    RethinkDisplay()

    VOID RethinkDisplay( VOID );

    FUNCTION
    This function performs the Intuition global display reconstruction.
    This includes rethinking about all of the  ViewPorts and their
    relationship to one another and reconstructing the entire display
    based on the results of this rethinking.

    Specifically, and omitting many internal details, the operation
    consists of this:

        Determine which ViewPorts are invisible and set their VP_HIDE
        ViewPort Mode flag. VP_HIDE flags are also set for screens that
        may not be simultaneously displayed with the frontmost (V36).

        If a change to a viewport height, or changing interlace or
        monitor scan rates require, MakeVPort() is called for specific
        screen viewports.  After this phase, the intermediate Copper lists
        for each screen's viewport are correctly set up.

        MrgCop() and LoadView() are then called to get these Copper lists
        in action, thus establishing the new state of the Intuition
        display.

    You may perform a MakeScreen() on your Custom Screen before calling
    this routine.  The results will be incorporated in the new display, but
    changing the INTERLACE ViewPort mode for one screens must be reflected
    in the Intuition View, which is left to Intuition.

    WARNING:  This routine can take several milliseconds to run, so
    do not use it lightly.

    New for V36: This routine is substantially changed to support
    new screen modes.  In particular, if screen rearrangement has
    caused a change in interlace mode or scan rate, this routine
    will remake the copper lists for each screen's viewport.

    INPUTS
    None

    RESULT
    None

    BUGS
    In V35 and earlier, an interlaced screen coming to the front
    may not trigger a complete remake as required when the global
    interlace state is changed.  In some cases, this can be compensated
    for by setting the viewport DHeight field to 0 for hidden screens.

    SEE ALSO
    RemakeDisplay(), graphics.library/MakeVPort(), graphics.library/MrgCop(),
    graphics.library/LoadView(), MakeScreen()
intuition.library/ScreenToBack                 intuition.library/ScreenToBack

    NAME
    ScreenToBack -- Send the specified screen to the back of the display.

    SYNOPSIS
    ScreenToBack( Screen )
              A0

    VOID ScreenToBack( struct Screen * );

    FUNCTION
    Sends the specified screen to the back of the display.

    INPUTS
    Screen = pointer to a Screen structure

    RESULT
    None

    BUGS

    SEE ALSO
    ScreenToFront()
intuition.library/ScreenToFront               intuition.library/ScreenToFront

    NAME
    ScreenToFront -- Make the specified screen the frontmost.

    SYNOPSIS
    ScreenToFront( Screen )
               A0

    VOID ScreenToFront( struct Screen * );

    FUNCTION
    Brings the specified Screen to the front of the display.

    INPUTS
    Screen = a pointer to a Screen structure

    RESULT
    None

    BUGS

    SEE ALSO
    ScreenToBack()
intuition.library/SetAttrsA                       intuition.library/SetAttrsA

    NAME
    SetAttrsA -- Specify attribute values for an object. (V36)
    SetAttrs -- Varargs stub for SetAttrsA(). (V36)

    SYNOPSIS
    result = SetAttrsA( Object, TagList )
    D0                  A0      A1

    ULONG SetAttrsA( APTR, struct TagItem * );

    result = SetAttrs( Object, Tag1, ... )

    ULONG SetAttrs( APTR, ULONG, ... );

    FUNCTION
    Specifies a set of attribute/value pairs with meaning as
    defined by a 'boopsi' object's class.

    This function does not provide enough context information or
    arbitration for boopsi gadgets which are attached to windows
    or requesters.  For those objects, use SetGadgetAttrs().

    INPUTS
    Object = abstract pointer to a boopsi object.
    TagList = array of TagItem structures with attribute/value pairs.

    RESULT
    The object does whatever it wants with the attributes you provide.
    The return value tends to be non-zero if the changes would require
    refreshing gadget imagery, if the object is a gadget.

    NOTES
    This function invokes the OM_SET method with a NULL GadgetInfo
    parameter.

    BUGS

    SEE ALSO
    NewObject(), DisposeObject(), GetAttr(), MakeClass(),
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.
intuition.library/SetDefaultPubScreen   intuition.library/SetDefaultPubScreen

    NAME
    SetDefaultPubScreen -- Choose a new default public screen. (V36)

    SYNOPSIS
    SetDefaultPubScreen( Name )
                 A0

    VOID SetDefaultPubScreen( UBYTE * );

    FUNCTION
    Establishes a new default public screen for visitor windows.

    This screen is used by windows asking for a named public screen
    that doesn't exist and the FALLBACK option is selected, and for
    windows asking for the default public screen directly.

    INPUTS
    Name = name of chosen public screen to be the new default.
    A value of NULL means that the Workbench screen is to
    be the default public screen.

    RESULT
    None

    BUGS

    SEE ALSO
    OpenWindow(), OpenScreen(), Intuition V36 update documentation
intuition.library/SetDMRequest                 intuition.library/SetDMRequest

    NAME
    SetDMRequest -- Set the DMRequest of a window.

    SYNOPSIS
    success = SetDMRequest( Window, DMRequest )
    D0                      A0      A1

    BOOL SetDMRequest( struct Window *, struct Requester * );

    FUNCTION
    Attempts to set the DMRequest into the specified window.
    The DMRequest is the special requester that you attach to
    the double-click of the menu button which the user can then
    bring up on demand.  This routine WILL NOT change the DMRequest
    if it's already set and is currently active (in use by the user).
    After having called SetDMRequest(), if you want to change the
    DMRequest, the correct way to start is by calling ClearDMRequest()
    until it returns a value of TRUE; then you can call SetDMRequest()
    with the new DMRequest.

    If the POINTREL flag is set in the DMRequest, the DMR will open as
    close to the pointer as possible.  The RelLeft/Top fields are
    for fine-tuning the position.

    INPUTS
    Window = pointer to the window from which the DMRequest is to be set
    DMRequest = a pointer to a requester

    RESULT
    If the current DMRequest was not in use, sets the DMRequest
        pointer into the window and returns TRUE.
    If the DMRequest was currently in use, doesn't change the pointer
        and returns FALSE

    BUGS

    SEE ALSO
    ClearDMRequest(), Request()
intuition.library/SetEditHook                   intuition.library/SetEditHook

    NAME
    SetEditHook -- Set global processing for string gadgets. (V36)

    SYNOPSIS
    OldHook = SetEditHook( Hook )
    D0                     A0

    struct Hook *SetEditHook( struct Hook * );

    FUNCTION
    Sets new global editing hook for string gadgets.

    WARNING: This function is wholly untested.  Do *NOT* use
    this in a commercial product until further notice.

    INPUTS
    Hook -- A pointer to a struct Hook which determines a function
      in your code to be called every time the user types a key.
      This is done before control is passed to the gadget custom
      editing hook, so effects ALL string gadgets.

    RESULT
    Returns previous global edit hook structure.

    BUGS
    Unknown, risky.

    SEE ALSO

intuition.library/SetGadgetAttrsA           intuition.library/SetGadgetAttrsA

    NAME
    SetGadgetAttrsA -- Specify attribute values for a boopsi gadget. (V36)
    SetGadgetAttrs -- Varargs stub for SetGadgetAttrsA(). (V36)

    SYNOPSIS
    result = SetGadgetAttrsA( Gadget, Window, Requester, TagList )
    D0                  A0      A1      A2         A3

    ULONG SetGadgetAttrsA( struct Gadget *, struct Window *,
        struct Requester *, struct TagItem * );

    result = SetGadgetAttrs( Gadget, Window, Requester, Tag1, ...)

    ULONG SetGadgetAttrs( struct Gadget *, struct Window *,
        struct Requester *, ULONG, ... );

    FUNCTION
    Same as SetAttrs(), but provides context information and
    arbitration for classes which implement custom Intuition gadgets.

    You should use this function for boopsi gadget objects which have
    already been added to a requester or a window, or for "models" which
    propagate information to gadget already added.

    Typically, the gadgets will refresh their visuals to reflect
    changes to visible attributes, such as the value of a slider,
    the text in a string-type gadget, the selected state of a button.

    You can use this as a replacement for SetAttrs(), too, if you
    specify NULL for the 'Window' and 'Requester' parameters.

    INPUTS
    Gadget = abstract pointer to a boopsi gadget
    Window = window gadget has been added to using AddGList() or AddGadget()
    Requester = for REQGADGETs, requester containing the gadget
    TagList = array of TagItem structures with attribute/value pairs.

    RESULT
    The object does whatever it wants with the attributes you provide,
    which might include updating its gadget visuals.

    The return value tends to be non-zero if the changes would require
    refreshing gadget imagery, if the object is a gadget.

    NOTES
    This function invokes the OM_SET method with a GadgetInfo
    derived from the 'Window' and 'Requester' pointers.

    BUGS
    There should be more arbitration between this function and
    the calls that Intuition's input task will make to the
    gadgets.  In the meantime, this function, input processing,
    and refreshing must be mutually re-entrant.

    SEE ALSO
    NewObject(), DisposeObject(), GetAttr(), MakeClass(),
    Document "Basic Object-Oriented Programming System for Intuition"
    and the "boopsi Class Reference" document.
intuition.library/SetMenuStrip                 intuition.library/SetMenuStrip

    NAME
    SetMenuStrip -- Attach a menu strip to a window.

    SYNOPSIS
    Success = SetMenuStrip( Window, Menu )
    D0                A0      A1

    BOOL SetMenuStrip( struct Window *, struct Menu * );

    FUNCTION
    Attaches the menu strip to the window.  After calling this routine,
    if the user presses the menu button, this specified menu strip
    will be displayed and accessible by the user.

    Menus with zero menu items are not allowed.

    NOTE:  You should always design your menu strip changes to be a
    two-way operation, where for every menu strip you add to your
    window you should always plan to clear that strip sometime.  Even
    in the simplest case, where you will have just one menu strip for
    the lifetime of your window, you should always clear the menu strip
    before closing the window.  If you already have a menu strip attached
    to this window, the correct procedure for changing to a new menu
    strip involves calling ClearMenuStrip() to clear the old first.

    The sequence of events should be:
    - OpenWindow()
    - zero or more iterations of:
          - SetMenuStrip()
          - ClearMenuStrip()
    - CloseWindow()

    INPUTS
    Window = pointer to a Window structure
    Menu = pointer to the first menu in the menu strip

    RESULT
    TRUE if there were no problems.  TRUE always, since this routine
    will wait until it is OK to proceed.

    BUGS

    SEE ALSO
    ClearMenuStrip(), ResetMenuStrip()
intuition.library/SetMouseQueue               intuition.library/SetMouseQueue

    NAME
    SetMouseQueue -- Change limit on pending mouse messages. (V36)

    SYNOPSIS
    oldQueueLength = SetMouseQueue( Window, QueueLength )
    D0                              A0      D0

    LONG SetMouseQueue( struct Window *, UWORD );

    FUNCTION
    Changes the number of mouse messages that Intuition will allow
    to be outstanding for your window.

    INPUTS
    Window = your window
    QueueLength = the new value of outstanding mouse movement messages
      you wish to allow.

    RESULT
    -1 if 'Window' is not known
    Otherwise the previous value of the queue limit.
    The corresponding function for changing the repeat key
    queue limit is not yet implemented.

    BUGS

    SEE ALSO
    OpenWindow()
intuition.library/SetPointer                     intuition.library/SetPointer

    NAME
    SetPointer -- Specify a pointer sprite image for a window.

    SYNOPSIS
    SetPointer( Window, Pointer, Height, Width, XOffset, YOffset )
            A0      A1       D0      D1     D2       D3

    VOID SetPointer( struct Window *, UWORD *, WORD, WORD, WORD, WORD );

    FUNCTION
    Sets up the window with the sprite definition for the pointer.
    Then, whenever the window is the active one, the pointer
    image will change to the window's version.  If the window is
    the active one when this routine is called, the change takes
    place immediately.

    The XOffset and YOffset parameters are used to offset the
    upper-left corner of the hardware sprite image from what Intuition
    regards as the current position of the pointer.  Another way of
    describing it is as the offset from the "hot spot" of the pointer
    to the top-left corner of the sprite.  For instance, if you specify
    offsets of zero, zero, then the top-left corner of your sprite
    image will be placed at the mouse position.  On the other hand,
    if you specify an XOffset of -7 (remember, sprites are 16 pixels
    wide) then your sprite will be centered over the mouse position.
    If you specify an XOffset of -15, the right-edge of the sprite
    will be over the mouse position.

    INPUTS
    Window = pointer to the window to receive this pointer definition
    Pointer = pointer to the data definition of a sprite
    Height = the height of the pointer
    Width = the width of the sprite (must be less than or equal to sixteen)
    XOffset = the offset for your sprite from the mouse position
    YOffset = the offset for your sprite from the mouse position

    RESULT
    None

    BUGS

    SEE ALSO
    ClearPointer(), Intuition Reference Manual or Amiga Rom
    Kernel Manual
intuition.library/SetPrefs                         intuition.library/SetPrefs

    NAME
    SetPrefs -- Set Intuition preferences data.

    SYNOPSIS
    Prefs = SetPrefs( PrefBuffer, Size, Inform )
    D0          A0          D0    D1

    struct Preferences *SetPrefs( struct Preferences *, LONG, BOOL );

    FUNCTION
    Sets new preferences values.  Copies the first 'Size' bytes
    from your preferences buffer to the system preferences table,
    and puts them into effect.

    The 'Inform' parameter, if TRUE, indicates that an IDCMP_NEWPREFS
    message is to be sent to all windows that have the IDCMP_NEWPREFS
    IDCMPFlag set.

    It is legal to set a partial copy of the Preferences structure.
    The most frequently changed values are grouped at the beginning
    of the Preferences structure.

    New for V36:  A new and more extensible method for supplying
    Preferences has been introduced in V36, and relies on file
    system notification.  The Intuition preferences items rely
    also on the IPrefs program.  Certain elements of the
    Preferences structure have been superceded by this new method.
    Pointer changes submitted through SetPrefs() are only heeded
    until the first time IPrefs informs Intuition of a V36-style
    pointer.ilbm preferences file.  The Preferences FontHeight and
    LaceWB fields are respected only from the system-configuration
    file, and never thereafter.  As well, the view centering and
    size apply only to the default monitor, and not to such modes
    as Productivity.  Other fields may be superceded in the future.

    INPUTS
    PrefBuffer = pointer to the memory buffer which contains your
        desired settings for Intuition preferences
    Size = the number of bytes in your PrefBuffer, the number of bytes
           you want copied to the system's internal preference settings
    Inform = whether you want the information of a new preferences
        setting propagated to all windows.

    NOTES
    Unless you are responding to a user's explicit request to
    change Preferences (for example, you are writing a Preferences
    editor), you should probably avoid using this function.
    The user's Preferences should be respected, not overridden.

    RESULT
    Returns your parameter PrefBuffer.

    BUGS

    SEE ALSO
    GetDefPrefs(), GetPrefs()
intuition.library/SetPubScreenModes       intuition.library/SetPubScreenModes

    NAME
    SetPubScreenModes -- Establish global public screen behavior. (V36)

    SYNOPSIS
    OldModes = SetPubScreenModes( Modes )
    D0                            D0

    UWORD SetPubScreenModes( UWORD );

    FUNCTION
        Sets GLOBAL Intuition public screen modes.

    INPUTS
    Modes = new global modes flags.  Values for flag bits are:
      SHANGHAI: workbench windows are to be opened on the
        default public screen
      POPPUBSCREEN: when a visitor window is opened, the public
        screen it opens on is to be brought to the front.

    RESULT
    OldModes = previous global mode settings

    BUGS

    SEE ALSO
    OpenScreen(), Intuition V36 update documentation
intuition.library/SetWindowTitles           intuition.library/SetWindowTitles

    NAME
    SetWindowTitles -- Set the window's titles for both window and screen.

    SYNOPSIS
    SetWindowTitles( Window, WindowTitle, ScreenTitle )
             A0      A1           A2

    VOID SetWindowTitles( struct Window *, UBYTE *, UBYTE * );

    FUNCTION
    Allows you to set the text which appears in the Window and/or Screen
    title bars.

    The window title appears at all times along the window title bar.
    The window's screen title appears at the screen title bar whenever
    this window is the active one.

    When this routine is called, your window title will be changed
    immediately.  If your window is the active one when this routine is
    called, the screen title will be changed immediately.

    You can specify a value of -1 (i.e. (UBYTE *) ~0) for either of
    the title pointers.  This designates that you want Intuition to leave
    the current setting of that particular title alone, and modify
    only the other one.  Of course, you could set both to -1.

    Furthermore, you can set a value of 0 (zero) for either of the
    title pointers.  Doing so specifies that you want no title to
    appear (the title bar will be blank).

    Both of the titles are rendered in the default font of the window's
    screen, as set using OpenScreen().

    In setting the window's title, Intuition may do some other rendering
    in the top border of your window.  If your own rendering sometimes
    appears in your window border areas, you may want to restore the entire
    window border frame.  The function SetWindowTitles() does not do this
    in the newer versions.  The function RefreshWindowFrame() is provided
    to do this kind of thing for you.

    INPUTS
    Window = pointer to your window structure
    WindowTitle = pointer to a null-terminated text string, or set to
           either the value of -1 (negative one) or 0 (zero)
    ScreenTitle = pointer to a null-terminated text string, or set to
           either the value of -1 (negative one) or 0 (zero)

    RESULT
    None

    BUGS

    SEE ALSO
    OpenWindow(), RefreshWindowFrame(), OpenScreen()
intuition.library/ShowTitle                       intuition.library/ShowTitle

    NAME
    ShowTitle -- Set the screen title bar display mode.

    SYNOPSIS
    ShowTitle( Screen, ShowIt )
           A0      D0

    VOID ShowTitle( struct Screen *, BOOL );

    FUNCTION
    This routine sets the SHOWTITLE flag of the specified screen, and
    then coordinates the redisplay of the screen and its windows.

    The screen title bar can appear either in front of or behind
    WFLG_BACKDROP windows.  This is contrasted with the fact that
    non-WFLG_BACKDROP windows always appear in front of the screen title
    bar.  You specify whether you want the screen title bar to be in front
    of or behind the screen's WFLG_BACKDROP windows by calling this
    routine.

    The ShowIt argument should be set to either TRUE or FALSE.  If TRUE,
       the screen's title bar will be shown in front of WFLG_BACKDROP windows
.
       If FALSE, the title bar will be rendered behind all windows.

       When a screen is first opened, the default setting of the SHOWTITLE
       flag is TRUE.

    INPUTS
       Screen = pointer to a Screen structure
       ShowIt = Boolean TRUE or FALSE describing whether to show or hide the
           screen title bar

    RESULT
       None

    BUGS

    SEE ALSO

intuition.library/SizeWindow                     intuition.library/SizeWindow

    NAME
    SizeWindow -- Ask Intuition to size a window.

    SYNOPSIS
    SizeWindow( Window, DeltaX, DeltaY )
            A0      D0      D1

    VOID SizeWindow( struct Window *, WORD, WORD );

    FUNCTION
    This routine sends a request to Intuition asking to size the window
    the specified amounts.  The delta arguments describe how much to
    size the window along the respective axes.

    Note that the window will not be sized immediately, but rather
    will be sized the next time Intuition receives an input event,
    which happens currently at a minimum rate of ten times per second,
    and a maximum of sixty times a second.  You can discover when
    you window has finally been sized by setting the IDCMP_NEWSIZE flag
    of the IDCMP of your window.  See the "Input and Output Methods"
    chapter of The Intuition Reference Manual for description of the IDCMP.

    New for V36: Intuition now will do validity checking on the final
    dimensions.  To change to new absolute dimensions, or to move and
    size a window in one step, use ChangeWindowBox().

    However, limit checking against window MinWidth, MinHeight,
    MaxWidth, and MaxHeight was not done prior to V36, and
    these fields are still ignored (as documented) if you have
    no sizing gadget (WFLG_SIZEGADGET is not set).  The *are*
    respected now (V36) if WFLG_SIZEGADGET is set.

    New for V36: you can determine when the change in size has
    taken effect by receiving the IDCMP_CHANGEWINDOW IDCMP message.

    INPUTS
    Window = pointer to the structure of the window to be sized
    DeltaX = signed value describing how much to size the window
     on the x-axis
    DeltaY = signed value describing how much to size the window
     on the y-axis

    RESULT
    None

    BUGS

    SEE ALSO
    ChangeWindowBox(), MoveWindow(), WindowToFront(), WindowToBack()
intuition.library/SysReqHandler               intuition.library/SysReqHandler

    NAME
    SysReqHandler -- Handle system requester input. (V36)

    SYNOPSIS
    num = SysReqHandler( Window, IDCMPFlagsPtr, WaitInput )
    D0                   A0      A1             D0

    LONG SysReqHandler( struct Window *, ULONG *, BOOL );

    FUNCTION
    Handles input for a window returned by either BuildSysRequest()
    or BuildEasyRequest().  These functions with SysReqHandler()
    you can perform an "asynchronous" EasyRequest() or AutoRequest().
    That is to say, you can perform other processing while you
    wait for the requester to be satisfied.

    Each time this function is called, it will process all
    IDCMPMessages that the window has received.  If the parameter
    'WaitInput' is non-zero, SysReqHandler() will wait for input
    (by calling WaitPort()) if there are no IDCMP messages.

    SysReqHandler() returns the same values as EasyRequest(): A gadget
    ID greater than equal to 0, and  -1 if one of the other IDCMP
    events were received.

    An additional value of -2 is returned if the input processed
    does not satisfy the requester.  In this case, you might
    perform some processing and call SysReqHandler() again.

    Note: this function does NOT terminate the system request.
    Not only must you call FreeSysRequest() to eliminate the request,
    but you may also continue processing after an event which would
    normally terminate a normal call to EasyRequest().

    EXAMPLE
    Implementation of EasyRequest() input loop:

    window = BuildEasyRequest( ZZZZ )
    while ( (retval = SysReqHandler( window, idcmp_ptr, TRUE )) == -2 )
    {
        /* loop    */;
    }
    FreeSysRequest( window );

    EXAMPLE
    Request a volume, but don't remove the requester when the
    user inserts the wrong disk:

    struct EasyStruct volumeES = {
        sizeof (struct EasyStruct),
        0,
        "Volume Request",
        "Please insert volume %s in any drive.",
        "Cancel"
    };

    Volume *
    getVolume( volname )
    UBYTE    *volname;
    {
        struct Window    *window;
        Volume        *volume = NULL;
        Volume        *findVolume();
        int            retval;

        window = BuildEasyRequest( NULL, &volumeES, IDCMP_DISKINSERTED,
                  volname );

        while ( (retval = SysReqHandler( window, NULL, TRUE )) != 0 )
        {
            /* not cancelled yet    */

            /* when IDCMP_DISKINSERTED, check for volume */
            if (( retval == -1 ) && (volume = findVolume( volname )))
            break;
        }
        FreeSysRequest( window );
        return ( volume );
    }

    INPUTS
    Window = Window pointer returned from BuildSysRequest() or
        BuildEasyRequest().  Those functions can also return
        values '0' or '1', and these values may also be
        passed to SysReqHandler(), which will immediately
        return the same value.

    IDCMPFlagsPtr = If you passed application specific IDCMP
        flags to BuildSysRequest() or BuildEasyRequest(),
        SysReqHandler() will return -1 if that IDCMP message
        is received.  If IDCMPFlagsPtr is non-null, it
        points to a ULONG where the IDCMP class received
        will be copied for your examination.

        This pointer can be NULL if you have provided no
        application specific IDCMP flags or if you do
        not need to know which application specific IDCMP
        event occurred.

        If you provide more than on flag in the flags variable
        this pointer points to, you will have to refresh
        the variable whenever -1 is returned, since the
        variable will have been changed to show just the
        single IDCMP Class bit that caused the return.

    WaitInput = Specifies that you want SysReqHandler() to
            to wait for IDCMP input if there is none pending.

    RESULT
    0, 1, ..., N = Successive GadgetID values, for the gadgets
        you specify for the requester.  NOTE: The numbering
        from left to right is actually: 1, 2, ..., N, 0.
        This is for compatibility with AutoRequests which has
        FALSE for the rightmost gadget.

    -1 = Means that one of the caller-supplied IDCMPFlags occurred.
        The IDCMPFlag value is in the longword pointed to by UDCMP_ptr.

    -2 = input processed did not satisfy the requester. One example
        is a keystroke that does not satisfy the requester.  Another
        example is if there is no input pending and you specified
        FALSE for WaitInput.

    BUGS

    SEE ALSO
    exec.library/WaitPort()
intuition.library/UnlockIBase                   intuition.library/UnlockIBase

    NAME
    UnlockIBase -- Surrender an Intuition lock gotten by LockIBase().

    SYNOPSIS
    UnlockIBase( Lock )
             A0

    VOID UnlockIBase( ULONG );

    FUNCTION

    Surrenders lock gotten by LockIBase().

    Calling this function when you do not own the specified lock will
    immediately crash the system.

    INPUTS
    The value returned by LockIBase() should be passed to this function,
    to specify which internal lock is to be freed.

    Note that the parameter is passed in A0, not D0, for historical reasons.

    RESULT
    None

    BUGS

    SEE ALSO
    LockIBase()
intuition.library/UnlockPubScreen           intuition.library/UnlockPubScreen

    NAME
    UnlockPubScreen -- Release lock on a public screen. (V36)

    SYNOPSIS
    UnlockPubScreen( Name, [Screen] )
             A0    A1

    VOID UnlockPubScreen( UBYTE *, struct Screen * );

    FUNCTION
    Releases lock gotten by LockPubScreen().
    It is best to identify the locked public screen by
    the pointer returned from LockPubScreen().  To do this,
    supply a NULL 'Name' pointer and the screen pointer.

    In rare circumstances where it would be more convenient to pass
    a non-NULL pointer to the public screen name string, the
    'Screen' parameter is ignored.

    INPUTS
    Name = pointer to name of public screen.  If Name is NULL,
        then argument 'Screen' is used as a direct pointer to
        a public screen.
    Screen = pointer to a public screen.  Used only if Name
        is NULL.  This pointer MUST have been returned
        by LockPubScreen().

    RESULT

    BUGS

    SEE ALSO
    LockPubScreen()
intuition.library/UnlockPubScreenList   intuition.library/UnlockPubScreenList

    NAME
    UnlockPubScreenList -- Release public screen list semaphore. (V36)

    SYNOPSIS
    UnlockPubScreenList()

    VOID UnlockPubScreenList( VOID );

    FUNCTION
    Releases lock gotten by LockPubScreenList().

    INPUTS
    None.

    RESULT
    None.

    BUGS

    SEE ALSO
    LockPubScreenList()
intuition.library/ViewAddress                   intuition.library/ViewAddress

    NAME
    ViewAddress -- Return the address of the Intuition View structure.

    SYNOPSIS
    view = ViewAddress()
    D0

    struct View *ViewAddress( VOID );

    FUNCTION
    Returns the address of the Intuition View structure.  If you
    want to use any of the graphics, text, or animation primitives
    in your window and that primitive requires a pointer to a view,
    this routine will return the address of the view for you.

    INPUTS
    None

    RESULT
    Returns the address of the Intuition View structure

    BUGS

    SEE ALSO
    graphics.library
intuition.library/ViewPortAddress           intuition.library/ViewPortAddress

    NAME
    ViewPortAddress -- Return the address of a window's viewport.

    SYNOPSIS
    ViewPort = ViewPortAddress( Window )
    D0                          A0

    struct ViewPort *ViewPortAddress( struct Window * );

    FUNCTION
    Returns the address of the viewport associated with the specified
    window.  The viewport is actually the viewport of the screen within
    which the window is displayed.  If you want to use any of the graphics,
    text, or animation primitives in your window and that primitive
    requires a pointer to a viewport, you can use this call.

    This pointer is only valid as long as your window's screen remains
    open, which is ensured by keeping your window open.

    INPUTS
    Window = pointer to the window for which you want the viewport address

    RESULT
    Returns the address of the Intuition ViewPort structure for
    your window's screen .

    BUGS
    This routine is unnecessary: you can just use the expression
    &Window->WScreen->ViewPort.

    SEE ALSO
    graphics.library
intuition.library/WBenchToBack                 intuition.library/WBenchToBack

    NAME
    WBenchToBack -- Send the Workbench screen in back of all screens.

    SYNOPSIS
    Success = WBenchToBack()
    D0

    BOOL WBenchToBack( VOID );

    FUNCTION
    Causes the Workbench screen, if it's currently opened, to go behind
    all other screens.  This does not 'move' the screen up or down,
    instead only affects the depth-arrangement of the screens.

    INPUTS
    None

    RESULT
    If the Workbench screen was opened, this function returns TRUE,
    otherwise it returns FALSE.

    BUGS

    SEE ALSO
    WBenchToFront(), ScreenToFront()
intuition.library/WBenchToFront               intuition.library/WBenchToFront

    NAME
    WBenchToFront -- Bring the Workbench screen in front of all screens.

    SYNOPSIS
    Success = WBenchToFront()
    D0

    BOOL WBenchToFront( VOID );

    FUNCTION
    Causes the Workbench Screen, if it's currently opened, to come to
    the foreground.  This does not 'move' the screen up or down, instead
    only affects the depth-arrangement of the screen.

    INPUTS
    None

    RESULT
    If the Workbench screen was opened, this function returns TRUE,
    otherwise it returns FALSE.

    BUGS

    SEE ALSO
    WBenchToBack(), ScreenToBack()
intuition.library/WindowLimits                 intuition.library/WindowLimits

    NAME
    WindowLimits -- Set the minimum and maximum limits of a window.

    SYNOPSIS
    Success = WindowLimits( Window, MinWidth, MinHeight, MaxWidth,
    D0                A0      D0        D1         D2
                            MaxHeight )
                            D3

    BOOL WindowLimits( struct Window *, WORD, WORD, UWORD, UWORD );

    FUNCTION
    Sets the minimum and maximum limits of the window's size.  Until this
    routine is called, the window's size limits are equal to the initial
    values established in the OpenWindow() function.

    After a call to this routine, the Window will be able to be sized
    to any dimensions within the specified limits.

    If you don't want to change any one of the dimensions, set the limit
    argument for that dimension to zero.  If any of the limit arguments
    is equal to zero, that argument is ignored and the initial setting
    of that parameter remains undisturbed.

    If any of the arguments is out of range (minimums greater than the
    current size, maximums less than the current size), that limit
    will be ignored, though the others will still take effect if they
    are in range.  If any are out of range, the return value from this
    procedure will be FALSE.  If all arguments are valid, the return
    value will be TRUE.

    If you want your window to be able to become "as large as possible"
    you may put -1 (i.e. ~0) in either or both Max arguments.  But
    please note: screen sizes may vary for several reasons, and you
    must be able to handle any possible size of window you might end
    up with if you use this method.  Note that you can use the function
    GetScreenData() to find out how big the screen your window appears in
    is.  That function is particularly useful if your window is in
    the Workbench screen.  You may also refer to the WScreen field
    in your window structure, providing that your window remains open,
    which will ensure that the screen remains open, and thus the
    pointer remains valid.

    If the user is currently sizing this window, the new limits will
    not take effect until after the sizing is completed.

    INPUTS
    Window = pointer to a Window structure
    MinWidth, MinHeight, MaxWidth, MaxHeight = the new limits for the size
            of this window.  If any of these is set to zero, it will
            be ignored and that setting will be unchanged.

    RESULT
    Returns TRUE if everything was in order.  If any of the parameters was
    out of range (minimums greater than current size, maximums less than
    current size), FALSE is returned and the errant limit request is
    not fulfilled (though the valid ones will be).

    BUGS

    SEE ALSO
    GetScreenData()
intuition.library/WindowToBack                 intuition.library/WindowToBack

    NAME
    WindowToBack -- Ask Intuition to send a window behind others.

    SYNOPSIS
    WindowToBack( Window )
              A0

    VOID WindowToBack( struct Window * );

    FUNCTION
    This routine sends a request to Intuition asking to send the window
    in back of all other windows in the screen.

    Note that the window will not be depth-arranged immediately, but rather
    will be arranged the next time Intuition receives an input event,
    which happens currently at a minimum rate of ten times per second,
    and a maximum of sixty times a second.

    Remember that WFLG_BACKDROP windows cannot be depth-arranged.

    INPUTS
    Window = pointer to the structure of the window to be sent to the back

    RESULT
    None

    BUGS

    SEE ALSO
    MoveWindow(), SizeWindow(), WindowToFront(), MoveWindowInFrontOf()
intuition.library/WindowToFront               intuition.library/WindowToFront

    NAME
    WindowToFront -- Ask Intuition to bring a window to the front.

    SYNOPSIS
    WindowToFront( Window )
                   A0

    VOID WindowToFront( struct Window * );

    FUNCTION
    This routine sends a request to Intuition asking to bring the window
    in front of all other windows in the screen.

    Note that the window will not be depth-arranged immediately, but rather
    will be arranged the next time Intuition receives an input event,
    which happens currently at a minimum rate of ten times per second,
    and a maximum of sixty times a second.

    Remember that WFLG_BACKDROP windows cannot be depth-arranged.

    INPUTS
    Window = pointer to the structure of the window to be brought to front

    RESULT
    None

    BUGS

    SEE ALSO
    MoveWindow(), SizeWindow(), WindowToBack(), MoveWindowInFrontOf()
intuition.library/ZipWindow                       intuition.library/ZipWindow

    NAME
    ZipWindow -- Change window to "alternate" position and
                 dimensions. (V36)

    SYNOPSIS
    ZipWindow( Window )
           A0

    VOID ZipWindow( struct Window * );

    FUNCTION
    Changes the position and dimension of a window to the values
    at the last occasion of ZipWindow being called (or invoked
    via the "zoom" gadget).

    Typically this is used to snap between a normal, large, working
    dimension of the window to a smaller, more innocuous position
    and dimension.

    Like MoveWindow(), SizeWindow(), and ChangeWindowBox(), the action of
    this function is deferred to the Intuition input handler.

    More tuning needs to be done to establish initial values for
    the first invocation of this function for a window.  You can
    provide initial values using the OpenWindow() tag item
    WA_Zoom.

    It could also use a new name, but "ZoomWindow" is misleading,
    since "Zoom" normally implies "scale."

    The zoom gadget will appear (in the place of the old "toback"
    gadget) when you open your window if you either specify a
    sizing gadget or use WA_Zoom.

    You can detect that this function has taken effect by receiving
    an IDCMP_CHANGEWINDOW IDCMP message.

    INPUTS
    Window -- window to be changed.

    RESULT
    None

    BUGS
    OpenWindow() assumes that the proper default "other" dimensions
    are "full size."

    SEE ALSO
    ChangeWindowBox(), MoveWindow(), SizeWindow()