Amiga ISO Collection/AmigaUtilCD2.iso/Programming/Misc/TRSICAT.LZX/CATS_CD2_TRSI/Reference_Library/lib_examples/blockinput.c

C/C++ Source or Header | 1992-08-21 | 4.7 KB | 195 lines

;/* blockinput.c - Execute me to compile me with SAS C 5.10
LC -b1 -cfistq -v -y -j73 blockinput.c
Blink FROM LIB:c.o,blockinput.o TO blockinput LIBRARY LIB:LC.lib,LIB:Amiga.lib
quit
**
** To use a window as a requester, first bring up a zero-sized requester
** attached to the main window (this provides the blocking feature).
** Then, bring up your second window, or bring up a busy pointer.  The
** following example illustrates bringing up a busy pointer.

** blockinput.c -- program to demonstrate how to block the input from a
** window using a minimal requester, and how to put up a busy pointer.
*/
#define INTUI_V36_NAMES_ONLY

#include <exec/types.h>
#include <intuition/intuition.h>

#include <clib/exec_protos.h>
#include <clib/intuition_protos.h>

#include <stdio.h>

#ifdef LATTICE
int CXBRK(void)    { return(0); }  /* Disable Lattice CTRL/C handling */
int chkabort(void) { return(0); }  /* really */
#endif

/* our function prototypes */
BOOL beginWait(struct Window *win, struct Requester *waitRequest);
VOID endWait(struct Window *win, struct Requester *waitRequest);
VOID processIDCMP(struct Window *win);

struct Library *IntuitionBase;

/* data for a busy pointer.
** this data must be in chip memory!!!
*/
UWORD __chip waitPointer[] =
    {
    0x0000, 0x0000,     /* reserved, must be NULL */

    0x0400, 0x07C0,
    0x0000, 0x07C0,
    0x0100, 0x0380,
    0x0000, 0x07E0,
    0x07C0, 0x1FF8,
    0x1FF0, 0x3FEC,
    0x3FF8, 0x7FDE,
    0x3FF8, 0x7FBE,
    0x7FFC, 0xFF7F,
    0x7EFC, 0xFFFF,
    0x7FFC, 0xFFFF,
    0x3FF8, 0x7FFE,
    0x3FF8, 0x7FFE,
    0x1FF0, 0x3FFC,
    0x07C0, 0x1FF8,
    0x0000, 0x07E0,

    0x0000, 0x0000,     /* reserved, must be NULL */
    };



/*
** main()
**
** Open a window and display a busy-pointer for a short time then wait for
** the user to hit the close gadget (in processIDCMP()).  Normally, the
** application would bracket sections of code where it wishes to block window
** input with the beginWait() and endWait() functions.
*/
VOID main (int argc, char **argv)
{
struct Window *win;

if (IntuitionBase = OpenLibrary("intuition.library",37))
    {
    if (win = OpenWindowTags(NULL,
                        WA_IDCMP, IDCMP_CLOSEWINDOW|IDCMP_INTUITICKS,
                        WA_Activate, TRUE,
                        WA_Width,  320,
                        WA_Height, 100,
                        WA_CloseGadget, TRUE,
                        WA_DragBar, TRUE,
                        WA_DepthGadget, TRUE,
                        WA_SizeGadget, TRUE,
                        WA_MaxWidth, ~0,
                        WA_MaxHeight, ~0,
                        TAG_END))
        {
        processIDCMP(win);
        CloseWindow(win);
        }
    CloseLibrary(IntuitionBase);
    }
}



/*
** beginWait()
**
** Clear the requester with InitRequester.  This makes a requester of
** width = 0, height = 0, left = 0, top = 0; in fact, everything is zero.
** This requester will simply block input to the window until
** EndRequest is called.
**
** The pointer is set to a reasonable 4-color busy pointer, with proper offsets.
*/
BOOL beginWait(struct Window *win, struct Requester *waitRequest)
{
extern UWORD __chip waitPointer[];

InitRequester(waitRequest);
if (Request(waitRequest, win))
    {
    SetPointer(win, waitPointer, 16, 16, -6, 0);
    SetWindowTitles(win,"Busy - Input Blocked",(UBYTE *)~0);
    return(TRUE);
    }
else
    return(FALSE);
}



/*
** endWait()
**
** Routine to reset the pointer to the system default, and remove the
** requester installed with beginWait().
*/
VOID endWait(struct Window *win, struct Requester *waitRequest)
{
ClearPointer(win);
EndRequest(waitRequest, win);
SetWindowTitles(win,"Not Busy",(UBYTE *)~0);
}


/*
** processIDCMP()
**
** Wait for the user to close the window.
*/
VOID processIDCMP(struct Window *win)
{
WORD done;
struct IntuiMessage *msg;
ULONG class;
struct Requester myreq;
UWORD tick_count;

done = FALSE;

/* Put up a requester with no imagery (size zero). */
if (beginWait(win,&myreq))
    {
    /*
    ** Insert code here for a window to act as the requester.
    */

    /* We'll count down INTUITICKS, which come about ten times
    ** a second.  We'll keep the busy state for about three seconds.
    */
    tick_count = 30;
    }

while (!done)
    {
    Wait(1L << win->UserPort->mp_SigBit);

    while (NULL != (msg = (struct IntuiMessage *)GetMsg(win->UserPort)))
        {
        class = msg->Class;
        ReplyMsg((struct Message *)msg);

        switch (class)
            {
            case IDCMP_CLOSEWINDOW:
                done = TRUE;
                break;

            case IDCMP_INTUITICKS:
                if (tick_count > 0)
                    {
                    if (--tick_count == 0)  endWait(win,&myreq);
                    }
                break;
            }
        }
    }
}