XPeekIfEvent man page on HP-UX
[printable version]
XPeekIfEvent() XPeekIfEvent()
Name
XPeekIfEvent – get an event matched by predicate procedure without
removing it from the queue.
Synopsis
XPeekIfEvent(display, event_return, predicate, arg)
Display *display;
XEvent *event_return;
Bool (*predicate)();
XPointer arg;
Arguments
display Specifies a connection to an X server; returned from
XOpenDisplay().
event_return
Returns a copy of the matched event.
predicate Specifies the procedure to be called to determine if each
event that arrives in the queue is the desired one.
arg Specifies the user-specified argument that will be passed to
the predicate procedure.
Description
XPeekIfEvent() returns an event only when the specified predicate pro‐
cedure returns True for the event. The event is copied into
event_return but not removed from the queue. The specified predicate
is called each time an event is added to the queue, with the arguments
display, event_return, and arg.
XPeekIfEvent() flushes the request buffer if no matching events could
be found on the queue, and then waits for the next matching event.
For more information, see Volume One, Chapter 8, Events.
See Also
XQLength(), XAllowEvents(), XCheckIfEvent(), XCheckMaskEvent(), XCheck‐
TypedEvent(), XCheckTypedWindowEvent(), XCheckWindowEvent(),
XEventsQueued(), XGetInputFocus(), XGetMotionEvents(), XIfEvent(),
XMaskEvent(), XNextEvent(), XPeekEvent(), XPending(), XPutBackEvent(),
XSelectInput(), XSendEvent(), XSetInputFocus(), XSynchronize(), XWin‐
dowEvent().
Xlib - Input Handling XPeekIfEvent()
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