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- /************************************************************
-
- Created: Thursday, September 7, 1989 at 9:11 PM
- CursorCtl.h
- C Interface to the Macintosh Libraries
-
-
-
- <<< CursorCtl - Cursor Control Header File >>>
-
- Copyright Apple Computer, Inc. 1985-1989
- 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
-
- ************************************************************/
-
-
- #ifndef __CURSORCTL__
- #define __CURSORCTL__
-
- enum {HIDDEN_CURSOR,I_BEAM_CURSOR,CROSS_CURSOR,PLUS_CURSOR,WATCH_CURSOR,
- ARROW_CURSOR};
- typedef unsigned char Cursors;
-
- struct Acur {
- short n; /*Number of cursors ("frames of film")*/
- short index; /* Next frame to show <for internal use>*/
- short frame1; /*'CURS' resource id for frame #1*/
- short fill1; /*<for internal use>*/
- short frame2; /*'CURS' resource id for frame #2*/
- short fill2; /*<for internal use>*/
- short frameN; /*'CURS' resource id for frame #N*/
- short fillN; /*<for internal use>*/
- };
-
- typedef struct Acur acur,*acurPtr,**acurHandle;
-
- #ifdef __cplusplus
- extern "C" {
- #endif
- pascal void InitCursorCtl(acurHandle newCursors);
- /*
- 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.
- */
-
- pascal void RotateCursor(long counter);
- /*
- 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.
- */
-
- pascal void SpinCursor(short increment);
- /*
- 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).
- */
-
- pascal void Hide_Cursor(void);
- /*
- 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.
- */
-
- pascal void Show_Cursor(Cursors cursorKind);
- /*
- 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).
- */
- #ifdef __cplusplus
- }
- #endif
-
- #endif
-