home *** CD-ROM | disk | FTP | other *** search
Text File | 1991-04-03 | 5.4 KB | 142 lines | [TEXT/PJMM] |
- { This file has been processed by The THINK Pascal Source Converter, v1.1. }
-
- {
- Created: Tuesday, August 2, 1988 at 12:24 PM
- CursorCtl.p
- Pascal Interface to the Macintosh Libraries
-
-
- <<< CursorCtl - Cursor Control Interface File >>>
-
-
- Copyright Apple Computer, Inc. 1984-1988
- All rights reserved
-
- This file contains:
-
- InitCursorCtl(newCursors) - Init CursorCtl to load the 'acur' resource
- RotateCursor(counter) - Sequence through cursor frames for counter mod 32
- SpinCursor(increment) - Sequence mod 32 incrementing internal counter
- Hide_Cursor() - Hide the current cursor
- Show_Cursor(cursorKind) - Show the cursor
- }
-
-
- {$IFC UNDEFINED UsingIncludes}
- {$SETC UsingIncludes := 0}
- {$ENDC}
-
-
- UNIT CursorCtl;
- INTERFACE
-
-
-
-
-
-
- TYPE
-
- { Kinds of cursor supported by CursorCtl }
- Cursors = (HIDDEN_CURSOR,I_BEAM_CURSOR,CROSS_CURSOR,PLUS_CURSOR,WATCH_CURSOR,
- ARROW_CURSOR);
-
- acurPtr = ^Acur;
- acurHandle = ^acurPtr;
- Acur = RECORD
- n: INTEGER; {Number of cursors ("frames of film")}
- index: INTEGER; { Next frame to show <for internal use>}
- frame1: INTEGER; {'CURS' resource id for frame #1}
- fill1: INTEGER; {<for internal use>}
- frame2: INTEGER; {'CURS' resource id for frame #2}
- fill2: INTEGER; {<for internal use>}
- frameN: INTEGER; {'CURS' resource id for frame #N}
- fillN: INTEGER; {<for internal use>}
- END;
-
-
-
- PROCEDURE InitCursorCtl(newCursors: UNIV acurHandle);
- { Initialize the CursorCtl unit. This should be called once prior to calling
- RotateCursor or SpinCursor. It need not be called if only Hide_Cursor or
- Show_Cursor are used. If NewCursors is NULL, InitCursorCtl loads in the
- 'acur' resource and the 'CURS' resources specified by the 'acur' resource
- ids. If any of the resources cannot be loaded, the cursor will not be
- changed.
-
- The 'acur' resource is assumed to either be in the currently running tool or
- application, or the MPW Shell for a tool, or in the System file. The 'acur'
- resource id must be 0 for a tool or application, 1 for the Shell, and 2 for
- the System file.
-
- If NewCursors is not NULL, it is ASSUMED to be a handle to an 'acur' formatted
- resource designated by the caller and it will be used instead of doing a
- GetResource on 'acur'. Note, if RotateCursor or SpinCursor are called without
- calling InitCursorCtl, then RotateCursor and SpinCursor will do the call for
- the user the first time it is called. However, the possible disadvantage of
- using this technique is that the resource memory allocated may have
- undesirable affect (fragmentation?) on the application. Using InitCursorCtl
- has the advantage of causing the allocation at a specific time determined by
- the user.
-
- Caution: InitCursorCtl MODIFIES the 'acur' resource in memory. Specifically,
- it changes each FrameN/fillN integer pair to a handle to the corresponding
- 'CURS' resource also in memory. Thus if NewCursors is not NULL when
- InitCursorCtl is called, the caller must guarantee NewCursors always points to
- a "fresh" copy of an 'acur' resource. This need only be of concern to a
- caller who wants to repeatly use multiple 'acur' resources during execution of
- their programs.
- }
-
- PROCEDURE RotateCursor(counter: LONGINT);
- { RotateCursor is called to rotate the "I am active" "beach ball" cursor, or to
- animate whatever sequence of cursors set up by InitCursorCtl. The next cursor
- ("frame") is used when Counter % 32 = 0 (Counter is some kind of incrementing
- or decrementing index maintained by the caller). A positive counter sequences
- forward through the cursors (e.g., it rotates the "beach ball" cursor
- clockwise), and a negative cursor sequences through the cursors backwards
- (e.g., it rotates the "beach ball" cursor counterclockwise). Note,
- RotateCursor just does a Mac SetCursor call for the proper cursor picture.
- It is assumed the cursor is visible from a prior Show_Cursor call.
- }
-
- PROCEDURE SpinCursor(increment: INTEGER);
- { SpinCursor is similar in function to RotateCursor, except that instead of
- passing a counter, an Increment is passed an added to a counter maintained
- here. SpinCursor is provided for those users who do not happen to have a
- convenient counter handy but still want to use the spinning "beach ball"
- cursor, or any sequence of cursors set up by InitCursorCtl. A positive
- increment sequences forward through the curos (rotating the "beach ball"
- cursor clockwise), and a negative increment sequences backward through the
- cursors (rotating the "beach ball" cursor counter-clockwise). A zero value
- for the increment resets the counter to zero. Note, it is the increment, and
- not the value of the counter that determines the sequencing direction of the
- cursor (and hence the spin direction of the "beach ball" cursor).
- }
-
- PROCEDURE Hide_Cursor;
- { Hide the cursor if it is showing.This is this unit's call to the Mac
- HideCursor routine.Thus the Mac cursor level is decremented by one when this
- routine is called.
- }
-
- PROCEDURE Show_Cursor(cursorKind: Cursors);
- { Increment the cursor level, which may have been decremented by Hide_Cursor,
- and display the specified cursor if the level becomes 0 (it is never
- incremented beyond 0).The CursorKind is the kind of cursor to show. It is
- one of the values HIDDEN_CURSOR, I_BEAM_CURSOR, CROSS_CURSOR, PLUS_CURSOR,
- WATCH_CURSOR, and ARROW_CURSOR. Except for HIDDEN_CURSOR, a Mac SetCursor is
- done for the specified cursor prior to doing a ShowCursor. HIDDEN_CURSOR just
- causes a ShowCursor call. Note, ARROW_CURSOR will only work correctly if
- there is already a grafPort set up pointed to by 0(A5).
- }
-
-
- { UsingCursorCtl }
-
-
- IMPLEMENTATION
- END.
-
-
-