man/man3/Tk_DeleteEventHandler.3 - toolchains/skids - Git at Google

 '\"
 '\" Copyright (c) 1990 The Regents of the University of California.
 '\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
 '\"
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 '\" RCS: @(#) $Id: EventHndlr.3,v 1.4 1999/04/21 21:53:21 rjohnson Exp $
 '\"
 '\" The definitions below are for supplemental macros used in Tcl/Tk
 '\" manual entries.
 '\"
 '\" .AP type name in/out ?indent?
 '\"	Start paragraph describing an argument to a library procedure.
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 '\"	or "in/out" to describe whether procedure reads or modifies arg,
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 '\" .OP cmdName dbName dbClass
 '\"	Start of description of a specific option.  cmdName gives the
 '\"	option's name as specified in the class command, dbName gives
 '\"	the option's name in the option database, and dbClass gives
 '\"	the option's class in the option database.
 '\"
 '\" .UL arg1 arg2
 '\"	Print arg1 underlined, then print arg2 normally.
 '\"
 '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
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 .TH Tk_CreateEventHandler 3 "" Tk "Tk Library Procedures"
 .BS
 .SH NAME
 Tk_CreateEventHandler, Tk_DeleteEventHandler \- associate procedure callback with an X event
 .SH SYNOPSIS
 .nf
 \fB#include <tk.h>\fR
 .sp
 \fBTk_CreateEventHandler\fR(\fItkwin, mask, proc, clientData\fR)
 .sp
 \fBTk_DeleteEventHandler\fR(\fItkwin, mask, proc, clientData\fR)
 .SH ARGUMENTS
 .AS "unsigned long" clientData
 .AP Tk_Window tkwin in
 Token for window in which events may occur.
 .AP "unsigned long" mask in
 Bit-mask of events (such as \fBButtonPressMask\fR)
 for which \fIproc\fR should be called.
 .AP Tk_EventProc *proc in
 Procedure to invoke whenever an event in \fImask\fR occurs
 in the window given by \fItkwin\fR.
 .AP ClientData clientData in
 Arbitrary one-word value to pass to \fIproc\fR.
 .BE

 .SH DESCRIPTION
 .PP
 \fBTk_CreateEventHandler\fR arranges for \fIproc\fR to be
 invoked in the future whenever one of the event types specified
 by \fImask\fR occurs in the window specified by \fItkwin\fR.
 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_EventProc\fR:
 .CS
 typedef void Tk_EventProc(
 	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_CreateEventHandler\fR when the callback
 was created.  Typically, \fIclientData\fR points to a data
 structure containing application-specific information about
 the window in which the event occurred.  \fIEventPtr\fR is
 a pointer to the X event, which will be one of the ones
 specified in the \fImask\fR argument to \fBTk_CreateEventHandler\fR.
 .PP
 \fBTk_DeleteEventHandler\fR may be called to delete a
 previously-created event handler:  it deletes the first handler
 it finds that is associated with \fItkwin\fR and matches the
 \fImask\fR, \fIproc\fR, and \fIclientData\fR arguments.  If
 no such handler exists, then \fBTk_HandleEvent\fR returns
 without doing anything.  Although Tk supports it, it's probably
 a bad idea to have more than one callback with the same \fImask\fR,
 \fIproc\fR, and \fIclientData\fR arguments.
 When a window is deleted all of its handlers will be deleted
 automatically;  in this case there is no need to call
 \fBTk_DeleteEventHandler\fR.
 .PP
 If multiple handlers are declared for the same type of X event
 on the same window, then the handlers will be invoked in the
 order they were created.

 .SH KEYWORDS
 bind, callback, event, handler
	'\"
	'\" Copyright (c) 1990 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.
	'\"
	'\" RCS: @(#) $Id: EventHndlr.3,v 1.4 1999/04/21 21:53:21 rjohnson Exp $
	'\"
	'\" The definitions below are for supplemental macros used in Tcl/Tk
	'\" manual entries.
	'\"
	'\" .AP type name in/out ?indent?
	'\" Start paragraph describing an argument to a library procedure.
	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	'\" or "in/out" to describe whether procedure reads or modifies arg,
	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	'\" needed; use .AS below instead)
	'\"
	'\" .AS ?type? ?name?
	'\" Give maximum sizes of arguments for setting tab stops. Type and
	'\" name are examples of largest possible arguments that will be passed
	'\" to .AP later. If args are omitted, default tab stops are used.
	'\"
	'\" .BS
	'\" Start box enclosure. From here until next .BE, everything will be
	'\" enclosed in one large box.
	'\"
	'\" .BE
	'\" End of box enclosure.
	'\"
	'\" .CS
	'\" Begin code excerpt.
	'\"
	'\" .CE
	'\" End code excerpt.
	'\"
	'\" .VS ?version? ?br?
	'\" Begin vertical sidebar, for use in marking newly-changed parts
	'\" of man pages. The first argument is ignored and used for recording
	'\" the version when the .VS was added, so that the sidebars can be
	'\" found and removed when they reach a certain age. If another argument
	'\" is present, then a line break is forced before starting the sidebar.
	'\"
	'\" .VE
	'\" End of vertical sidebar.
	'\"
	'\" .DS
	'\" Begin an indented unfilled display.
	'\"
	'\" .DE
	'\" End of indented unfilled display.
	'\"
	'\" .SO
	'\" Start of list of standard options for a Tk widget. The
	'\" options follow on successive lines, in four columns separated
	'\" by tabs.
	'\"
	'\" .SE
	'\" End of list of standard options for a Tk widget.
	'\"
	'\" .OP cmdName dbName dbClass
	'\" Start of description of a specific option. cmdName gives the
	'\" option's name as specified in the class command, dbName gives
	'\" the option's name in the option database, and dbClass gives
	'\" the option's class in the option database.
	'\"
	'\" .UL arg1 arg2
	'\" Print arg1 underlined, then print arg2 normally.
	'\"
	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
	'\"
	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
	.if t .wh -1.3i ^B
	.nr ^l \n(.l
	.ad b
	'\" # Start an argument description
	.de AP
	.ie !"\\$4"" .TP \\$4
	.el \{\
	. ie !"\\$2"" .TP \\n()Cu
	. el .TP 15
	.\}
	.ta \\n()Au \\n()Bu
	.ie !"\\$3"" \{\
	\&\\$1 \\fI\\$2\\fP (\\$3)
	.\".b
	.\}
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	.br
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	..
	.AS Tcl_Interp Tcl_CreateInterp in/out
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	\h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.el \}\
	\h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
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	.\" Draw three-sided box if this is the box's first page,
	.\" draw two sides but no top otherwise.
	.ie !\\n(^b-1 \h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.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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	.nr ^x \\n(^tu+1v-\\n(^Yu
	\kx\h'-\\nxu'\h'\|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'\|0u'\c
	.\}
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	'fi
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	.de SO
	.SH "STANDARD OPTIONS"
	.LP
	.nf
	.ta 5.5c 11c
	.ft B
	..
	'\" # SE - end of list of standard options
	.de SE
	.fi
	.ft R
	.LP
	See the \\fBoptions\\fR manual entry for details on the standard options.
	..
	'\" # OP - start of full description for a single option
	.de OP
	.LP
	.nf
	.ta 4c
	Command-Line Name: \\fB\\$1\\fR
	Database Name: \\fB\\$2\\fR
	Database Class: \\fB\\$3\\fR
	.fi
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	..
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	.de CS
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	..
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	.fi
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	..
	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.TH Tk_CreateEventHandler 3 "" Tk "Tk Library Procedures"
	.BS
	.SH NAME
	Tk_CreateEventHandler, Tk_DeleteEventHandler \- associate procedure callback with an X event
	.SH SYNOPSIS
	.nf
	\fB#include <tk.h>\fR
	.sp
	\fBTk_CreateEventHandler\fR(\fItkwin, mask, proc, clientData\fR)
	.sp
	\fBTk_DeleteEventHandler\fR(\fItkwin, mask, proc, clientData\fR)
	.SH ARGUMENTS
	.AS "unsigned long" clientData
	.AP Tk_Window tkwin in
	Token for window in which events may occur.
	.AP "unsigned long" mask in
	Bit-mask of events (such as \fBButtonPressMask\fR)
	for which \fIproc\fR should be called.
	.AP Tk_EventProc *proc in
	Procedure to invoke whenever an event in \fImask\fR occurs
	in the window given by \fItkwin\fR.
	.AP ClientData clientData in
	Arbitrary one-word value to pass to \fIproc\fR.
	.BE

	.SH DESCRIPTION
	.PP
	\fBTk_CreateEventHandler\fR arranges for \fIproc\fR to be
	invoked in the future whenever one of the event types specified
	by \fImask\fR occurs in the window specified by \fItkwin\fR.
	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_EventProc\fR:
	.CS
	typedef void Tk_EventProc(
	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_CreateEventHandler\fR when the callback
	was created. Typically, \fIclientData\fR points to a data
	structure containing application-specific information about
	the window in which the event occurred. \fIEventPtr\fR is
	a pointer to the X event, which will be one of the ones
	specified in the \fImask\fR argument to \fBTk_CreateEventHandler\fR.
	.PP
	\fBTk_DeleteEventHandler\fR may be called to delete a
	previously-created event handler: it deletes the first handler
	it finds that is associated with \fItkwin\fR and matches the
	\fImask\fR, \fIproc\fR, and \fIclientData\fR arguments. If
	no such handler exists, then \fBTk_HandleEvent\fR returns
	without doing anything. Although Tk supports it, it's probably
	a bad idea to have more than one callback with the same \fImask\fR,
	\fIproc\fR, and \fIclientData\fR arguments.
	When a window is deleted all of its handlers will be deleted
	automatically; in this case there is no need to call
	\fBTk_DeleteEventHandler\fR.
	.PP
	If multiple handlers are declared for the same type of X event
	on the same window, then the handlers will be invoked in the
	order they were created.

	.SH KEYWORDS
	bind, callback, event, handler