[OpenSPARC-T2-SAM] / sam-t2 / devtools / amd64 / man / man3 / Tk_DeleteGenericHandler.3

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'\" The definitions below are for supplemental macros used in Tcl/Tk
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.TH Tk_CreateGenericHandler 3 "" Tk "Tk Library Procedures"
.BS
.SH NAME
Tk_CreateGenericHandler, Tk_DeleteGenericHandler \- associate procedure callback with all X events
.SH SYNOPSIS
.nf
\fB#include <tk.h>\fR
.sp
\fBTk_CreateGenericHandler\fR(\fIproc, clientData\fR)
.sp
\fBTk_DeleteGenericHandler\fR(\fIproc, clientData\fR)
.SH ARGUMENTS
.AS "Tk_GenericProc" clientData
.AP Tk_GenericProc *proc in
Procedure to invoke whenever any X event occurs on any display.
.AP ClientData clientData in
Arbitrary one-word value to pass to \fIproc\fR.
.BE

.SH DESCRIPTION
.PP
\fBTk_CreateGenericHandler\fR arranges for \fIproc\fR to be
invoked in the future whenever any X event occurs.  This mechanism is
\fInot\fR intended for dispatching X events on windows managed by Tk
(you should use \fBTk_CreateEventHandler\fR for this purpose).
\fBTk_CreateGenericHandler\fR is intended for other purposes, such
as tracing X events, monitoring events on windows not owned by Tk,
accessing X-related libraries that were not originally designed for
use with Tk, and so on.
.PP
The callback to \fIproc\fR will be made by \fBTk_HandleEvent\fR;
this mechanism only works in programs that dispatch events
through \fBTk_HandleEvent\fR (or through other Tk procedures that
call \fBTk_HandleEvent\fR, such as \fBTk_DoOneEvent\fR or
\fBTk_MainLoop\fR).
.PP
\fIProc\fR should have arguments and result that match the
type \fBTk_GenericProc\fR:
.CS
typedef int Tk_GenericProc(
	ClientData \fIclientData\fR,
	XEvent *\fIeventPtr\fR);
.CE
The \fIclientData\fR parameter to \fIproc\fR is a copy of the \fIclientData\fR
argument given to \fBTk_CreateGenericHandler\fR when the callback
was created.  Typically, \fIclientData\fR points to a data
structure containing application-specific information about
how to handle events.
\fIEventPtr\fR is a pointer to the X event.
.PP
Whenever an X event is processed by \fBTk_HandleEvent\fR, \fIproc\fR
is called.  The return value from \fIproc\fR is normally 0.
A non-zero return value indicates that the event is not to be handled
further; that is, \fIproc\fR has done all processing that is to be
allowed for the event.
.PP
If there are multiple generic event handlers, each one is called
for each event, in the order in which they were established.
.PP
\fBTk_DeleteGenericHandler\fR may be called to delete a
previously-created generic event handler:  it deletes each handler
it finds that matches the \fIproc\fR and \fIclientData\fR arguments.  If
no such handler exists, then \fBTk_DeleteGenericHandler\fR returns
without doing anything.  Although Tk supports it, it's probably
a bad idea to have more than one callback with the same
\fIproc\fR and \fIclientData\fR arguments.
.PP
Establishing a generic event handler does nothing to ensure that the
process will actually receive the X events that the handler wants to
process.
For example, it is the caller's responsibility to invoke
\fBXSelectInput\fR to select the desired events, if that is necessary.
.SH KEYWORDS
bind, callback, event, handler
Commit	Line	Data
920dae64 AT	1	'\"
	2	'\" Copyright (c) 1992-1994 The Regents of the University of California.
	3	'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
	4	'\"
	5	'\" See the file "license.terms" for information on usage and redistribution
	6	'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	7	'\"
	8	'\" RCS: @(#) $Id: CrtGenHdlr.3,v 1.2 1998/09/14 18:22:46 stanton Exp $
	9	'\"
	10	'\" The definitions below are for supplemental macros used in Tcl/Tk
	11	'\" manual entries.
	12	'\"
	13	'\" .AP type name in/out ?indent?
	14	'\" Start paragraph describing an argument to a library procedure.
	15	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	16	'\" or "in/out" to describe whether procedure reads or modifies arg,
	17	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	18	'\" needed; use .AS below instead)
	19	'\"
	20	'\" .AS ?type? ?name?
	21	'\" Give maximum sizes of arguments for setting tab stops. Type and
	22	'\" name are examples of largest possible arguments that will be passed
	23	'\" to .AP later. If args are omitted, default tab stops are used.
	24	'\"
	25	'\" .BS
	26	'\" Start box enclosure. From here until next .BE, everything will be
	27	'\" enclosed in one large box.
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	40	'\" of man pages. The first argument is ignored and used for recording
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	42	'\" found and removed when they reach a certain age. If another argument
	43	'\" is present, then a line break is forced before starting the sidebar.
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	52	'\" End of indented unfilled display.
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	54	'\" .SO
	55	'\" Start of list of standard options for a Tk widget. The
	56	'\" options follow on successive lines, in four columns separated
	57	'\" by tabs.
	58	'\"
	59	'\" .SE
	60	'\" End of list of standard options for a Tk widget.
	61	'\"
	62	'\" .OP cmdName dbName dbClass
	63	'\" Start of description of a specific option. cmdName gives the
	64	'\" option's name as specified in the class command, dbName gives
65	'\" the option's name in the option database, and dbClass gives
66	'\" the option's class in the option database.
67	'\"
68	'\" .UL arg1 arg2
69	'\" Print arg1 underlined, then print arg2 normally.
70	'\"
71	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
72	'\"
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74	.if t .wh -1.3i ^B
75	.nr ^l \n(.l
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79	.ie !"\\$4"" .TP \\$4
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81	. ie !"\\$2"" .TP \\n()Cu
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107	..
108	.AS Tcl_Interp Tcl_CreateInterp in/out
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177	.el \h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
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219	See the \\fBoptions\\fR manual entry for details on the standard options.
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245	..
246	.TH Tk_CreateGenericHandler 3 "" Tk "Tk Library Procedures"
247	.BS
248	.SH NAME
249	Tk_CreateGenericHandler, Tk_DeleteGenericHandler \- associate procedure callback with all X events
250	.SH SYNOPSIS
251	.nf
252	\fB#include <tk.h>\fR
253	.sp
254	\fBTk_CreateGenericHandler\fR(\fIproc, clientData\fR)
255	.sp
256	\fBTk_DeleteGenericHandler\fR(\fIproc, clientData\fR)
257	.SH ARGUMENTS
258	.AS "Tk_GenericProc" clientData
259	.AP Tk_GenericProc *proc in
260	Procedure to invoke whenever any X event occurs on any display.
261	.AP ClientData clientData in
262	Arbitrary one-word value to pass to \fIproc\fR.
263	.BE
264
265	.SH DESCRIPTION
266	.PP
267	\fBTk_CreateGenericHandler\fR arranges for \fIproc\fR to be
268	invoked in the future whenever any X event occurs. This mechanism is
269	\fInot\fR intended for dispatching X events on windows managed by Tk
270	(you should use \fBTk_CreateEventHandler\fR for this purpose).
271	\fBTk_CreateGenericHandler\fR is intended for other purposes, such
272	as tracing X events, monitoring events on windows not owned by Tk,
273	accessing X-related libraries that were not originally designed for
274	use with Tk, and so on.
275	.PP
276	The callback to \fIproc\fR will be made by \fBTk_HandleEvent\fR;
277	this mechanism only works in programs that dispatch events
278	through \fBTk_HandleEvent\fR (or through other Tk procedures that
279	call \fBTk_HandleEvent\fR, such as \fBTk_DoOneEvent\fR or
280	\fBTk_MainLoop\fR).
281	.PP
282	\fIProc\fR should have arguments and result that match the
283	type \fBTk_GenericProc\fR:
284	.CS
285	typedef int Tk_GenericProc(
286	ClientData \fIclientData\fR,
287	XEvent *\fIeventPtr\fR);
288	.CE
289	The \fIclientData\fR parameter to \fIproc\fR is a copy of the \fIclientData\fR
290	argument given to \fBTk_CreateGenericHandler\fR when the callback
291	was created. Typically, \fIclientData\fR points to a data
292	structure containing application-specific information about
293	how to handle events.
294	\fIEventPtr\fR is a pointer to the X event.
295	.PP
296	Whenever an X event is processed by \fBTk_HandleEvent\fR, \fIproc\fR
297	is called. The return value from \fIproc\fR is normally 0.
298	A non-zero return value indicates that the event is not to be handled
299	further; that is, \fIproc\fR has done all processing that is to be
300	allowed for the event.
301	.PP
302	If there are multiple generic event handlers, each one is called
303	for each event, in the order in which they were established.
304	.PP
305	\fBTk_DeleteGenericHandler\fR may be called to delete a
306	previously-created generic event handler: it deletes each handler
307	it finds that matches the \fIproc\fR and \fIclientData\fR arguments. If
308	no such handler exists, then \fBTk_DeleteGenericHandler\fR returns
309	without doing anything. Although Tk supports it, it's probably
310	a bad idea to have more than one callback with the same
311	\fIproc\fR and \fIclientData\fR arguments.
312	.PP
313	Establishing a generic event handler does nothing to ensure that the
314	process will actually receive the X events that the handler wants to
315	process.
316	For example, it is the caller's responsibility to invoke
317	\fBXSelectInput\fR to select the desired events, if that is necessary.
318	.SH KEYWORDS
319	bind, callback, event, handler