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

 '\"
 '\" Copyright (c) 1992-1994 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: CrtGenHdlr.3,v 1.2 1998/09/14 18:22:46 stanton 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.
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 '\"	found and removed when they reach a certain age.  If another argument
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 '\" .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
 .\}
 .el \{\
 .br
 .ie !"\\$2"" \{\
 \&\\$1	\\fI\\$2\\fP
 .\}
 .el \{\
 \&\\fI\\$1\\fP
 .\}
 .\}
 ..
 '\"	# define tabbing values for .AP
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 .nr )A 10n
 .if !"\\$1"" .nr )A \\w'\\$1'u+3n
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 .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
 .nr )C \\n()Bu+\\w'(in/out)'u+2n
 ..
 .AS Tcl_Interp Tcl_CreateInterp in/out
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 .\"	box if the box started on an earlier page.
 .ie !\\n(^b-1 \{\
 \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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 .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
 .\}
 .if \\n(^v \{\
 .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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 .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
 .IP
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 .de UL
 \\$1\l'|0\(ul'\\$2
 ..
 .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
	'\"
	'\" Copyright (c) 1992-1994 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: CrtGenHdlr.3,v 1.2 1998/09/14 18:22:46 stanton 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
	.\}
	.el \{\
	.br
	.ie !"\\$2"" \{\
	\&\\$1 \\fI\\$2\\fP
	.\}
	.el \{\
	\&\\fI\\$1\\fP
	.\}
	.\}
	..
	'\" # define tabbing values for .AP
	.de AS
	.nr )A 10n
	.if !"\\$1"" .nr )A \\w'\\$1'u+3n
	.nr )B \\n()Au+15n
	.\"
	.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
	.nr )C \\n()Bu+\\w'(in/out)'u+2n
	..
	.AS Tcl_Interp Tcl_CreateInterp in/out
	'\" # BS - start boxed text
	'\" # ^y = starting y location
	'\" # ^b = 1
	.de BS
	.br
	.mk ^y
	.nr ^b 1u
	.if n .nf
	.if n .ti 0
	.if n \l'\\n(.lu\(ul'
	.if n .fi
	..
	'\" # BE - end boxed text (draw box now)
	.de BE
	.nf
	.ti 0
	.mk ^t
	.ie n \l'\\n(^lu\(ul'
	.el \{\
	.\" Draw four-sided box normally, but don't draw top of
	.\" box if the box started on an earlier page.
	.ie !\\n(^b-1 \{\
	\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'
	.\}
	.\}
	.fi
	.br
	.nr ^b 0
	..
	'\" # VS - start vertical sidebar
	'\" # ^Y = starting y location
	'\" # ^v = 1 (for troff; for nroff this doesn't matter)
	.de VS
	.if !"\\$2"" .br
	.mk ^Y
	.ie n 'mc \s12\(br\s0
	.el .nr ^v 1u
	..
	'\" # VE - end of vertical sidebar
	.de VE
	.ie n 'mc
	.el \{\
	.ev 2
	.nf
	.ti 0
	.mk ^t
	\h'\|\\n(^lu+3n'\L'\|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-\|\\n(^lu+3n'
	.sp -1
	.fi
	.ev
	.\}
	.nr ^v 0
	..
	'\" # Special macro to handle page bottom: finish off current
	'\" # box/sidebar if in box/sidebar mode, then invoked standard
	'\" # page bottom macro.
	.de ^B
	.ev 2
	'ti 0
	'nf
	.mk ^t
	.if \\n(^b \{\
	.\" 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
	.\}
	.if \\n(^v \{\
	.nr ^x \\n(^tu+1v-\\n(^Yu
	\kx\h'-\\nxu'\h'\|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'\|0u'\c
	.\}
	.bp
	'fi
	.ev
	.if \\n(^b \{\
	.mk ^y
	.nr ^b 2
	.\}
	.if \\n(^v \{\
	.mk ^Y
	.\}
	..
	'\" # DS - begin display
	.de DS
	.RS
	.nf
	.sp
	..
	'\" # DE - end display
	.de DE
	.fi
	.RE
	.sp
	..
	'\" # SO - start of list of standard options
	.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
	.IP
	..
	'\" # CS - begin code excerpt
	.de CS
	.RS
	.nf
	.ta .25i .5i .75i 1i
	..
	'\" # CE - end code excerpt
	.de CE
	.fi
	.RE
	..
	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.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