92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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Copyright 1985, 1987, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "Xlibint.h"
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extern long const _Xevent_to_mask[];
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#define AllPointers (PointerMotionMask|PointerMotionHintMask|ButtonMotionMask)
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#define AllButtons (Button1MotionMask|Button2MotionMask|Button3MotionMask|\
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Button4MotionMask|Button5MotionMask)
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/*
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* Check existing events in queue to find if any match. If so, return.
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* If not, flush buffer and see if any more events are readable. If one
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* matches, return. If all else fails, tell the user no events found.
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*/
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Bool XCheckWindowEvent (
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register Display *dpy,
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Window w, /* Selected window. */
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long mask, /* Selected event mask. */
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register XEvent *event) /* XEvent to be filled in. */
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{
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register _XQEvent *prev, *qelt;
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unsigned long qe_serial = 0;
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int n; /* time through count */
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LockDisplay(dpy);
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/* Delete unclaimed cookies */
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_XFreeEventCookies(dpy);
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prev = NULL;
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for (n = 3; --n >= 0;) {
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for (qelt = prev ? prev->next : dpy->head;
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qelt;
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prev = qelt, qelt = qelt->next) {
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if ((qelt->event.xany.window == w) &&
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(qelt->event.type < GenericEvent) &&
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(_Xevent_to_mask[qelt->event.type] & mask) &&
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((qelt->event.type != MotionNotify) ||
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(mask & AllPointers) ||
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(mask & AllButtons & qelt->event.xmotion.state))) {
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*event = qelt->event;
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_XDeq(dpy, prev, qelt);
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UnlockDisplay(dpy);
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return True;
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}
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}
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if (prev)
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qe_serial = prev->qserial_num;
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switch (n) {
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case 2:
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_XEventsQueued(dpy, QueuedAfterReading);
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break;
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case 1:
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_XFlush(dpy);
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break;
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}
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if (prev && prev->qserial_num != qe_serial)
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/* another thread has snatched this event */
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prev = NULL;
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}
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UnlockDisplay(dpy);
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return False;
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}
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