C/C++ Users Group Library 1996 July/C-C++ Users Group Library July 1996.iso/listings/v_02_07/2n07041a

Text File | 1991-06-01 | 5.4 KB | 232 lines

/*
 * Support routines for the Animated Cursor Demo Program
 * Written by Alex Leavens, for ShadowCat Technologies
 *
 * Created: 10/May/91
 * Revised: 12/May/91
 */


#include <WINDOWS.H>
#include "CURSOR.H"

/*-------------------------- Local variables ----------------------*/

BOOL    whirling;               /* Cursor spinning or not */
WORD    whichWatch;             /* Current watch value */

WORD    speed;                  /* How fast to go... */

/*-------------------------- Function prototypes ------------------*/

void FAR PASCAL         Whirly(BOOL);
void FAR PASCAL         SetCursorBusy(void);
void NEAR PASCAL        DisableMenuEntries(HWND);
void NEAR PASCAL        CheckSpeedMenu(HWND, WORD);

/******************************
 *
 * Quit()
 *   Quits the demo program
 *
 */

    BOOL FAR PASCAL
QuitFunc(HWND           hWnd,
         unsigned       message,
         WORD           wParam,
         LONG           lParam)
{
    PostMessage(hWnd, WM_CLOSE, 0, 0L);
    return TRUE;
}

/************************
 *
 * SetSpeed()
 *   Sets the speed to the desired setting
 *
 */

    BOOL FAR PASCAL
SetSpeed(HWND hWnd, unsigned message,
       WORD wParam, LONG lParam)
{
    static int speeds[4] = { 1000, 600, 400, 200 };
    speed = speeds[wParam-IDM_Speed1];

    DisableMenuEntries(hWnd);   /* Uncheck all speed entries */
    CheckSpeedMenu(hWnd, wParam);
    return TRUE;
}

/*******************************
 *
 * Animate()
 *   Plays the cursor animation back at the currently
 * selected speed.
 */

    BOOL FAR PASCAL
Animate(HWND            hWnd,
        unsigned        message,
        WORD            wParam,
        LONG            lParam)
{
    int         i;
    WORD        j;
    WORD        k;
    WORD        foo;

    Whirly(TRUE);

    for (i = 0; i < 50; i++)
    {
        foo = 0;

        for (j = 0; j < speed; j++)
        {
            for (k = 0; k < speed; k++)
            {
                foo++;
            }
        }
        Whirly(TRUE);
    }

    Whirly(FALSE);

    return TRUE;
}

/***********************************
 *
 * HandleCursorSet()
 *   Handles the message when Windows wants to set the cursor.
 *
 * Arguments:
 *      hWnd    - handle to the window that the message is destined for
 *      message - what the message is
 *      wParam  - points to the window handle that contains the cursor
 *      lParam  - in the loword: hit test code
 *                in the hiword: mouse message number
 *
 * Returns:
 *      TRUE if we processed the event
 *      the return from DefWindowProc() if Windows handled the event
 *
 */

    long FAR PASCAL
HandleCursorSet(HWND     hWnd,
                unsigned message,
                WORD     wParam,
                LONG     lParam)
{
    int hitTest;

    if (wParam != MainhWnd)     /* If not our window, then don't change */
        return DefWindowProc(hWnd, message, wParam, lParam);

    hitTest = LOWORD(lParam);   /* Get cursor position within window */

    if (hitTest != HTCLIENT)    /* If not in client area, let
                                 * Windows handle it.
                                 */
        return DefWindowProc(hWnd, message, wParam, lParam);

    if (whirling)               /* Are we spinning the stopwatch? */
        return TRUE;            /* If yes, don't let Windows change the */
    else                        /* cursor, otherwise, let Windows
                                 * handle the message.
                                 */
        return DefWindowProc(hWnd, message, wParam, lParam);
}

/************************
 *
 * Whirly()
 *   Animates the busy cursor, and updates the index into which
 * image we'll need to use next.
 *
 */

    void FAR PASCAL
Whirly(BOOL hitWhirly)
{
    if (hitWhirly)
        whirling = TRUE;
    else
    {
        whirling = FALSE;
        return;
    }

    SetCursorBusy();

    whichWatch++;

    if (whichWatch > 7)
        whichWatch = 0;
}

/*******************
 *
 * SetCursorBusy()
 *   Sets the cursor to one of 8 possible images of a stopwatch;
 * when done in sequence, the stopwatch appears animated.
 *
 */

    void FAR PASCAL
SetCursorBusy()
{
    HCURSOR     loadCur;
    static char cursorName[] = "WATCH ";

    if(whichWatch >= 8)
        whichWatch  = 0;
    cursorName[5]   = '1' + whichWatch;

    loadCur = LoadCursor(hInst,cursorName);
    if (loadCur != NULL)
        SetCursor(loadCur);
}
/************************
 *
 * DisableMenuEntries()
 *   Unchecks all of the speed settings in the menu
 *
 */

    void NEAR PASCAL
DisableMenuEntries(HWND hWnd)
{
    HMENU       hMenu;          /* Menu handle... */

    hMenu = GetMenu(hWnd);      /* Get handle to the menu */

    CheckMenuItem(hMenu, IDM_Speed1, MF_UNCHECKED);
    CheckMenuItem(hMenu, IDM_Speed2, MF_UNCHECKED);
    CheckMenuItem(hMenu, IDM_Speed3, MF_UNCHECKED);
    CheckMenuItem(hMenu, IDM_Speed4, MF_UNCHECKED);
}
/**************************
 *
 * CheckSpeedMenu()
 *   Checks the requested speed menu entry
 *
 */

    void NEAR PASCAL
CheckSpeedMenu(HWND     hWnd,
               WORD     entry)
{
    HMENU       hMenu;          /* Menu handle... */

    hMenu = GetMenu(hWnd);      /* Get handle to the menu */

    CheckMenuItem(hMenu, entry, MF_CHECKED);
}