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

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 '\" Copyright (c) 1994 The Regents of the University of California.
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 '\" .OP cmdName dbName dbClass
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 '\"	option's name as specified in the class command, dbName gives
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 .AS Tcl_Interp Tcl_CreateInterp in/out
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 \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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 See the \\fBoptions\\fR manual entry for details on the standard options.
 ..
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 .TH Tk_CreateBindingTable 3 4.0 Tk "Tk Library Procedures"
 .BS
 .SH NAME
 Tk_CreateBindingTable, Tk_DeleteBindingTable, Tk_CreateBinding, Tk_DeleteBinding, Tk_GetBinding, Tk_GetAllBindings, Tk_DeleteAllBindings, Tk_BindEvent \- invoke scripts in response to X events
 .SH SYNOPSIS
 .nf
 \fB#include <tk.h>\fR
 .sp
 Tk_BindingTable
 \fBTk_CreateBindingTable(\fIinterp\fB)\fR
 .sp
 \fBTk_DeleteBindingTable(\fIbindingTable\fB)\fR
 .sp
 unsigned long
 \fBTk_CreateBinding(\fIinterp, bindingTable, object, eventString, script, append\fB)\fR
 .sp
 int
 \fBTk_DeleteBinding(\fIinterp, bindingTable, object, eventString\fB)\fR
 .sp
 CONST char *
 \fBTk_GetBinding(\fIinterp, bindingTable, object, eventString\fB)\fR
 .sp
 \fBTk_GetAllBindings(\fIinterp, bindingTable, object\fB)\fR
 .sp
 \fBTk_DeleteAllBindings(\fIbindingTable, object\fB)\fR
 .sp
 \fBTk_BindEvent(\fIbindingTable, eventPtr, tkwin, numObjects, objectPtr\fB)\fR
 .SH ARGUMENTS
 .AS Tk_BindingTable bindingTable
 .AP Tcl_Interp *interp in
 Interpreter to use when invoking bindings in binding table.  Also
 used for returning results and errors from binding procedures.
 .AP Tk_BindingTable bindingTable in
 Token for binding table;  must have been returned by some previous
 call to \fBTk_CreateBindingTable\fR.
 .AP ClientData object in
 Identifies object with which binding is associated.
 .AP "CONST char" *eventString in
 String describing event sequence.
 .AP char *script in
 Tcl script to invoke when binding triggers.
 .AP int append in
 Non-zero means append \fIscript\fR to existing script for binding,
 if any; zero means replace existing script with new one.
 .AP XEvent *eventPtr in
 X event to match against bindings in \fIbindingTable\fR.
 .AP Tk_Window tkwin in
 Identifier for any window on the display where the event occurred.
 Used to find display-related information such as key maps.
 .AP int numObjects in
 Number of object identifiers pointed to by \fIobjectPtr\fR.
 .AP ClientData *objectPtr in
 Points to an array of object identifiers:  bindings will be considered
 for each of these objects in order from first to last.
 .BE

 .SH DESCRIPTION
 .PP
 These procedures provide a general-purpose mechanism for creating
 and invoking bindings.
 Bindings are organized in terms of \fIbinding tables\fR.
 A binding table consists of a collection of bindings plus a history
 of recent events.
 Within a binding table, bindings are associated with \fIobjects\fR.
 The meaning of an object is defined by clients of the binding package.
 For example, Tk keeps uses one binding table to hold all of the bindings
 created by the \fBbind\fR command.
 For this table, objects are pointers to strings such as window names, class
 names, or other binding tags such as \fBall\fR.
 Tk also keeps a separate binding table for each canvas widget, which manages
 bindings created by the canvas's \fBbind\fR widget command;  within
 this table, an object is either a pointer to the internal structure for a
 canvas item or a Tk_Uid identifying a tag.
 .PP
 The procedure \fBTk_CreateBindingTable\fR creates a new binding
 table and associates \fIinterp\fR with it (when bindings in the
 table are invoked, the scripts will be evaluated in \fIinterp\fR).
 \fBTk_CreateBindingTable\fR returns a token for the table, which
 must be used in calls to other procedures such as \fBTk_CreateBinding\fR
 or \fBTk_BindEvent\fR.
 .PP
 \fBTk_DeleteBindingTable\fR frees all of the state associated
 with a binding table.
 Once it returns the caller should not use the \fIbindingTable\fR
 token again.
 .PP
 \fBTk_CreateBinding\fR adds a new binding to an existing table.
 The \fIobject\fR argument identifies the object with which the
 binding is to be associated, and it may be any one-word value.
 Typically it is a pointer to a string or data structure.
 The \fIeventString\fR argument identifies the event or sequence
 of events for the binding;  see the documentation for the
 \fBbind\fR command for a description of its format.
 \fIscript\fR is the Tcl script to be evaluated when the binding
 triggers.
 \fIappend\fR indicates what to do if there already
 exists a binding for \fIobject\fR and \fIeventString\fR:  if \fIappend\fR
 is zero then \fIscript\fR replaces the old script;  if \fIappend\fR
 is non-zero then the new script is appended to the old one.
 \fBTk_CreateBinding\fR returns an X event mask for all the events
 associated with the bindings.
 This information may be useful to invoke \fBXSelectInput\fR to
 select relevant events, or to disallow the use of certain events
 in bindings.
 If an error occurred while creating the binding (e.g., \fIeventString\fR
 refers to a non-existent event), then 0 is returned and an error
 message is left in \fIinterp->result\fR.
 .PP
 \fBTk_DeleteBinding\fR removes from \fIbindingTable\fR the
 binding given by \fIobject\fR and \fIeventString\fR, if
 such a binding exists.
 \fBTk_DeleteBinding\fR always returns TCL_OK.
 In some cases it may reset \fIinterp->result\fR to the default
 empty value.
 .PP
 \fBTk_GetBinding\fR returns a pointer to the script associated
 with \fIeventString\fR and \fIobject\fR in \fIbindingTable\fR.
 If no such binding exists then NULL is returned and an error
 message is left in \fIinterp->result\fR.
 .PP
 \fBTk_GetAllBindings\fR returns in \fIinterp->result\fR a list
 of all the event strings for which there are bindings in
 \fIbindingTable\fR associated with \fIobject\fR.
 If there are no bindings for \fIobject\fR then an empty
 string is returned in \fIinterp->result\fR.
 .PP
 \fBTk_DeleteAllBindings\fR deletes all of the bindings in
 \fIbindingTable\fR that are associated with \fIobject\fR.
 .PP
 \fBTk_BindEvent\fR is called to process an event.
 It makes a copy of the event in an internal history list associated
 with the binding table, then it checks for bindings that match
 the event.
 \fBTk_BindEvent\fR processes each of the objects pointed to
 by \fIobjectPtr\fR in turn.
 For each object, it finds all the bindings that match the current
 event history, selects the most specific binding using the priority
 mechanism described in the documentation for \fBbind\fR,
 and invokes the script for that binding.
 If there are no matching bindings for a particular object, then
 the object is skipped.
 \fBTk_BindEvent\fR continues through all of the objects, handling
 exceptions such as errors, \fBbreak\fR, and \fBcontinue\fR as
 described in the documentation for \fBbind\fR.

 .SH KEYWORDS
 binding, event, object, script
	'\"
	'\" Copyright (c) 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: BindTable.3,v 1.3 2002/08/05 04:30:38 dgp 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.
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	'\" .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
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	'\" is present, then a line break is forced before starting the sidebar.
	'\"
	'\" .VE
	'\" End of vertical sidebar.
	'\"
	'\" .DS
	'\" Begin an indented unfilled display.
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	'\" 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
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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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	.de BS
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	.mk ^y
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	.\" 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'
	.\}
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	.\" draw two sides but no top otherwise.
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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
	.\}
	.bp
	'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
	.IP
	..
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	.de CS
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	..
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	.de CE
	.fi
	.RE
	..
	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.TH Tk_CreateBindingTable 3 4.0 Tk "Tk Library Procedures"
	.BS
	.SH NAME
	Tk_CreateBindingTable, Tk_DeleteBindingTable, Tk_CreateBinding, Tk_DeleteBinding, Tk_GetBinding, Tk_GetAllBindings, Tk_DeleteAllBindings, Tk_BindEvent \- invoke scripts in response to X events
	.SH SYNOPSIS
	.nf
	\fB#include <tk.h>\fR
	.sp
	Tk_BindingTable
	\fBTk_CreateBindingTable(\fIinterp\fB)\fR
	.sp
	\fBTk_DeleteBindingTable(\fIbindingTable\fB)\fR
	.sp
	unsigned long
	\fBTk_CreateBinding(\fIinterp, bindingTable, object, eventString, script, append\fB)\fR
	.sp
	int
	\fBTk_DeleteBinding(\fIinterp, bindingTable, object, eventString\fB)\fR
	.sp
	CONST char *
	\fBTk_GetBinding(\fIinterp, bindingTable, object, eventString\fB)\fR
	.sp
	\fBTk_GetAllBindings(\fIinterp, bindingTable, object\fB)\fR
	.sp
	\fBTk_DeleteAllBindings(\fIbindingTable, object\fB)\fR
	.sp
	\fBTk_BindEvent(\fIbindingTable, eventPtr, tkwin, numObjects, objectPtr\fB)\fR
	.SH ARGUMENTS
	.AS Tk_BindingTable bindingTable
	.AP Tcl_Interp *interp in
	Interpreter to use when invoking bindings in binding table. Also
	used for returning results and errors from binding procedures.
	.AP Tk_BindingTable bindingTable in
	Token for binding table; must have been returned by some previous
	call to \fBTk_CreateBindingTable\fR.
	.AP ClientData object in
	Identifies object with which binding is associated.
	.AP "CONST char" *eventString in
	String describing event sequence.
	.AP char *script in
	Tcl script to invoke when binding triggers.
	.AP int append in
	Non-zero means append \fIscript\fR to existing script for binding,
	if any; zero means replace existing script with new one.
	.AP XEvent *eventPtr in
	X event to match against bindings in \fIbindingTable\fR.
	.AP Tk_Window tkwin in
	Identifier for any window on the display where the event occurred.
	Used to find display-related information such as key maps.
	.AP int numObjects in
	Number of object identifiers pointed to by \fIobjectPtr\fR.
	.AP ClientData *objectPtr in
	Points to an array of object identifiers: bindings will be considered
	for each of these objects in order from first to last.
	.BE

	.SH DESCRIPTION
	.PP
	These procedures provide a general-purpose mechanism for creating
	and invoking bindings.
	Bindings are organized in terms of \fIbinding tables\fR.
	A binding table consists of a collection of bindings plus a history
	of recent events.
	Within a binding table, bindings are associated with \fIobjects\fR.
	The meaning of an object is defined by clients of the binding package.
	For example, Tk keeps uses one binding table to hold all of the bindings
	created by the \fBbind\fR command.
	For this table, objects are pointers to strings such as window names, class
	names, or other binding tags such as \fBall\fR.
	Tk also keeps a separate binding table for each canvas widget, which manages
	bindings created by the canvas's \fBbind\fR widget command; within
	this table, an object is either a pointer to the internal structure for a
	canvas item or a Tk_Uid identifying a tag.
	.PP
	The procedure \fBTk_CreateBindingTable\fR creates a new binding
	table and associates \fIinterp\fR with it (when bindings in the
	table are invoked, the scripts will be evaluated in \fIinterp\fR).
	\fBTk_CreateBindingTable\fR returns a token for the table, which
	must be used in calls to other procedures such as \fBTk_CreateBinding\fR
	or \fBTk_BindEvent\fR.
	.PP
	\fBTk_DeleteBindingTable\fR frees all of the state associated
	with a binding table.
	Once it returns the caller should not use the \fIbindingTable\fR
	token again.
	.PP
	\fBTk_CreateBinding\fR adds a new binding to an existing table.
	The \fIobject\fR argument identifies the object with which the
	binding is to be associated, and it may be any one-word value.
	Typically it is a pointer to a string or data structure.
	The \fIeventString\fR argument identifies the event or sequence
	of events for the binding; see the documentation for the
	\fBbind\fR command for a description of its format.
	\fIscript\fR is the Tcl script to be evaluated when the binding
	triggers.
	\fIappend\fR indicates what to do if there already
	exists a binding for \fIobject\fR and \fIeventString\fR: if \fIappend\fR
	is zero then \fIscript\fR replaces the old script; if \fIappend\fR
	is non-zero then the new script is appended to the old one.
	\fBTk_CreateBinding\fR returns an X event mask for all the events
	associated with the bindings.
	This information may be useful to invoke \fBXSelectInput\fR to
	select relevant events, or to disallow the use of certain events
	in bindings.
	If an error occurred while creating the binding (e.g., \fIeventString\fR
	refers to a non-existent event), then 0 is returned and an error
	message is left in \fIinterp->result\fR.
	.PP
	\fBTk_DeleteBinding\fR removes from \fIbindingTable\fR the
	binding given by \fIobject\fR and \fIeventString\fR, if
	such a binding exists.
	\fBTk_DeleteBinding\fR always returns TCL_OK.
	In some cases it may reset \fIinterp->result\fR to the default
	empty value.
	.PP
	\fBTk_GetBinding\fR returns a pointer to the script associated
	with \fIeventString\fR and \fIobject\fR in \fIbindingTable\fR.
	If no such binding exists then NULL is returned and an error
	message is left in \fIinterp->result\fR.
	.PP
	\fBTk_GetAllBindings\fR returns in \fIinterp->result\fR a list
	of all the event strings for which there are bindings in
	\fIbindingTable\fR associated with \fIobject\fR.
	If there are no bindings for \fIobject\fR then an empty
	string is returned in \fIinterp->result\fR.
	.PP
	\fBTk_DeleteAllBindings\fR deletes all of the bindings in
	\fIbindingTable\fR that are associated with \fIobject\fR.
	.PP
	\fBTk_BindEvent\fR is called to process an event.
	It makes a copy of the event in an internal history list associated
	with the binding table, then it checks for bindings that match
	the event.
	\fBTk_BindEvent\fR processes each of the objects pointed to
	by \fIobjectPtr\fR in turn.
	For each object, it finds all the bindings that match the current
	event history, selects the most specific binding using the priority
	mechanism described in the documentation for \fBbind\fR,
	and invokes the script for that binding.
	If there are no matching bindings for a particular object, then
	the object is skipped.
	\fBTk_BindEvent\fR continues through all of the objects, handling
	exceptions such as errors, \fBbreak\fR, and \fBcontinue\fR as
	described in the documentation for \fBbind\fR.

	.SH KEYWORDS
	binding, event, object, script