diff options
Diffstat (limited to 'tk8.6/doc/HandleEvent.3')
| -rw-r--r-- | tk8.6/doc/HandleEvent.3 | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/tk8.6/doc/HandleEvent.3 b/tk8.6/doc/HandleEvent.3 new file mode 100644 index 0000000..bc293b6 --- /dev/null +++ b/tk8.6/doc/HandleEvent.3 @@ -0,0 +1,46 @@ +'\" +'\" Copyright (c) 1990-1992 The Regents of the University of California. +'\" Copyright (c) 1994-1996 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +.TH Tk_HandleEvent 3 "" Tk "Tk Library Procedures" +.so man.macros +.BS +.SH NAME +Tk_HandleEvent \- invoke event handlers for window system events +.SH SYNOPSIS +.nf +\fB#include <tk.h>\fR +.sp +\fBTk_HandleEvent\fR(\fIeventPtr\fR) +.SH ARGUMENTS +.AS XEvent *eventPtr +.AP XEvent *eventPtr in +Pointer to X event to dispatch to relevant handler(s). It is important +that all unused fields of the structure be set to zero. +.BE +.SH DESCRIPTION +.PP +\fBTk_HandleEvent\fR is a lower-level procedure that deals with window +events. It is called by \fBTcl_ServiceEvent\fR (and indirectly by +\fBTk_DoOneEvent\fR), and in a few other cases within Tk. +It makes callbacks to any window event +handlers (created by calls to \fBTk_CreateEventHandler\fR) +that match \fIeventPtr\fR and then returns. In some cases +it may be useful for an application to bypass the Tk event +queue and call \fBTk_HandleEvent\fR directly instead of +calling \fBTcl_QueueEvent\fR followed by +\fBTcl_ServiceEvent\fR. +.PP +This procedure may be invoked recursively. For example, +it is possible to invoke \fBTk_HandleEvent\fR recursively +from a handler called by \fBTk_HandleEvent\fR. This sort +of operation is useful in some modal situations, such +as when a +notifier has been popped up and an application wishes to +wait for the user to click a button in the notifier before +doing anything else. +.SH KEYWORDS +callback, event, handler, window |