50 lines
1.6 KiB
Groff
50 lines
1.6 KiB
Groff
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'\"
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'\" Copyright (c) 1990-1992 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" SCCS: @(#) HandleEvent.3 1.6 96/03/26 18:13:34
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'\"
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.so man.macros
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.TH Tk_HandleEvent 3 "" Tk "Tk Library Procedures"
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.BS
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.SH NAME
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Tk_HandleEvent \- invoke event handlers for window system events
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.SH SYNOPSIS
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.nf
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\fB#include <tk.h>\fR
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.sp
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\fBTk_HandleEvent\fR(\fIeventPtr\fR)
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.SH ARGUMENTS
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.AS XEvent *eventPtr
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.AP XEvent *eventPtr in
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Pointer to X event to dispatch to relevant handler(s).
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.BE
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.SH DESCRIPTION
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.PP
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\fBTk_HandleEvent\fR is a lower-level procedure that deals with window
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events. It is called by \fBTk_ServiceEvent\fR (and indirectly by
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\fBTk_DoOneEvent\fR), and in a few other cases within Tk.
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It makes callbacks to any window event
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handlers (created by calls to \fBTk_CreateEventHandler\fR)
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that match \fIeventPtr\fR and then returns. In some cases
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it may be useful for an application to bypass the Tk event
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queue and call \fBTk_HandleEvent\fR directly instead of
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calling \fBTk_QueueEvent\fR followed by
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\fBTk_ServiceEvent\fR.
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.PP
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This procedure may be invoked recursively. For example,
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it is possible to invoke \fBTk_HandleEvent\fR recursively
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from a handler called by \fBTk_HandleEvent\fR. This sort
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of operation is useful in some modal situations, such
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as when a
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notifier has been popped up and an application wishes to
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wait for the user to click a button in the notifier before
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doing anything else.
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.SH KEYWORDS
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callback, event, handler, window
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