/*                                  SpinCursor.c                                */

/*

 * SpinCursor.c

 * Copyright © 1993 Apple Computer Inc. All rights reserved.

 * This is based on a sample in Think Reference 2.0.

 */

#ifndef THINK_C             /* MPW includes         */

#include <Errors.h>

#include <Script.h>

#include <Types.h>

#include <Files.h>

#include <Resources.h>

#include <QuickDraw.h>

#include <Fonts.h>

#include <Events.h>

#include <Windows.h>

#include <ToolUtils.h>

#include <Memory.h>

#include <Menus.h>

#include <Lists.h>

#include <Printing.h>

#include <Dialogs.h>

#include <StandardFile.h>

#endif

#define kAnimationInterval      (6)         /* Ticks                */

/*

 * This is used by the animated cursor subroutine.

 */

typedef struct {

    unsigned short      nFrames;

    unsigned short      nextFrame;

    CursHandle          frame[1];

} ACUR_Record, *ACUR_Ptr, **ACUR_Handle;

ACUR_Handle             gACUR_Handle;

#define ACUR            (**gACUR_Handle)

unsigned long           gACUR_NextAnimation;

void                    SetupAnimatedCursor(

        short                       acurResID

    );

void                    SpinCursor(void);

/*

 * SetupAnimatedCursor

 * Build the animated cursor handle array (in global gACUR_Handle)

 */

void

SetupAnimatedCursor(

        short                       acurResID

    )

{

        short                   cursorID;

        short                   i;

        gACUR_Handle = (ACUR_Handle) GetResource('acur', acurResID);

        if (gACUR_Handle != NULL) {

            DetachResource((Handle) gACUR_Handle);

            for (i = 0; i < ACUR.nFrames; i++) {

                cursorID = ((unsigned long) ACUR.frame[i]) >> 16;

                ACUR.frame[i] = GetCursor(cursorID);

                if (ACUR.frame[i] == NULL)

                    break;

                HNoPurge((Handle) ACUR.frame[i]);

            }

            ACUR.nFrames = i;

            ACUR.nextFrame = 0;

            if (i == 0) {

                DisposeHandle((Handle) gACUR_Handle);

                gACUR_Handle = NULL;

            }

        }

        gACUR_NextAnimation = 0;

}

/*

 * SpinCursor

 * This is called repeatedly to change the cursor animation.

 */

void

SpinCursor(void)

{

        unsigned long               now;

        if (gACUR_Handle != NULL) {

            now = TickCount();

            if (now > gACUR_NextAnimation) {

                gACUR_NextAnimation = now + kAnimationInterval;

                if (ACUR.nextFrame >= ACUR.nFrames)

                    ACUR.nextFrame = 0;

                SetCursor(*ACUR.frame[ACUR.nextFrame]);

                ++ACUR.nextFrame;

            }

        }

}