194 lines
4.1 KiB
Plaintext
194 lines
4.1 KiB
Plaintext
.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.na
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.de Ds
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.nf
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.TH XIfEvent 3X11 "Release 5" "X Version 11" "XLIB FUNCTIONS"
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.SH NAME
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XIfEvent, XCheckIfEvent, XPeekIfEvent \- check the event queue with a predicate procedure
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.SH SYNTAX
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XIfEvent\^(\^\fIdisplay\fP, \fIevent_return\fP, \fIpredicate\fP, \fIarg\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.br
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XEvent *\fIevent_return\fP\^;
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.br
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Bool (\^*\fIpredicate\fP\^)\^(\^)\^;
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.br
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XPointer \fIarg\fP\^;
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.LP
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Bool XCheckIfEvent\^(\^\fIdisplay\fP, \fIevent_return\fP, \fIpredicate\fP, \fIarg\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.br
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XEvent *\fIevent_return\fP\^;
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.br
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Bool (\^*\fIpredicate\fP\^)\^(\^)\^;
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.br
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XPointer \fIarg\fP\^;
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.LP
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XPeekIfEvent\^(\^\fIdisplay\fP, \fIevent_return\fP, \fIpredicate\fP, \fIarg\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.br
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XEvent *\fIevent_return\fP\^;
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.br
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Bool (\^*\fIpredicate\fP\^)\^(\^)\^;
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.br
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XPointer \fIarg\fP\^;
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.SH ARGUMENTS
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.IP \fIarg\fP 1i
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Specifies the user-supplied argument that will be passed to the predicate procedure.
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.\" $Header: display.a,v 1.1 88/02/26 10:26:29 mento Exp $
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.ds Ev \ either a copy of or
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.\" $Header: event_gen.a,v 1.2 88/08/04 11:12:20 mento Exp $
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.IP \fIevent_return\fP 1i
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Returns\*(Ev the matched event's associated structure.
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.IP \fIpredicate\fP 1i
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Specifies the procedure that is to be called to determine
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if the next event in the queue matches what you want.
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.SH DESCRIPTION
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.\" $Header: XIfEvent.d,v 1.2 88/06/11 07:51:39 mento Exp $
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The
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.ZN XIfEvent
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function completes only when the specified predicate
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procedure returns
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.ZN True
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for an event,
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which indicates an event in the queue matches.
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.ZN XIfEvent
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flushes the output buffer if it blocks waiting for additional events.
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.ZN XIfEvent
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removes the matching event from the queue
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and copies the structure into the client-supplied
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.ZN XEvent
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structure.
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.LP
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.\" $Header: XCkIfEvent.d,v 1.2 88/06/11 07:49:21 mento Exp $
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When the predicate procedure finds a match,
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.ZN XCheckIfEvent
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copies the matched event into the client-supplied
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.ZN XEvent
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structure and returns
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.ZN True .
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(This event is removed from the queue.)
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If the predicate procedure finds no match,
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.ZN XCheckIfEvent
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returns
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.ZN False ,
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and the output buffer will have been flushed.
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All earlier events stored in the queue are not discarded.
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.LP
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.\" $Header: XPkIfEvent.d,v 1.3 88/06/11 07:52:13 mento Exp $
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The
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.ZN XPeekIfEvent
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function returns only when the specified predicate
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procedure returns
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.ZN True
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for an event.
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After the predicate procedure finds a match,
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.ZN XPeekIfEvent
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copies the matched event into the client-supplied
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.ZN XEvent
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structure without removing the event from the queue.
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.ZN XPeekIfEvent
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flushes the output buffer if it blocks waiting for additional events.
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.SH "SEE ALSO"
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XAnyEvent(3X11),
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XNextEvent(3X11),
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XPutBackEvent(3X11)
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XSendEvent(3X11)
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.br
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\fI\*(xL\fP
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