'\" 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
'\" .AP type name in/out ?indent?
'\" Start paragraph describing an argument to a library procedure.
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'\" options follow on successive lines, in four columns separated
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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.
'\" 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.
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.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
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.AS Tcl_Interp Tcl_CreateInterp in/out
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See the \\fBoptions\\fR manual entry for details on the standard options.
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Command-Line Name: \\fB\\$1\\fR
Database Name: \\fB\\$2\\fR
Database Class: \\fB\\$3\\fR
'\" # CS - begin code excerpt
'\" # CE - end code excerpt
.TH Tk_CreateBindingTable 3 4.0 Tk "Tk Library Procedures"
Tk_CreateBindingTable, Tk_DeleteBindingTable, Tk_CreateBinding, Tk_DeleteBinding, Tk_GetBinding, Tk_GetAllBindings, Tk_DeleteAllBindings, Tk_BindEvent \- invoke scripts in response to X events
\fBTk_CreateBindingTable(\fIinterp\fB)\fR
\fBTk_DeleteBindingTable(\fIbindingTable\fB)\fR
\fBTk_CreateBinding(\fIinterp, bindingTable, object, eventString, script, append\fB)\fR
\fBTk_DeleteBinding(\fIinterp, bindingTable, object, eventString\fB)\fR
\fBTk_GetBinding(\fIinterp, bindingTable, object, eventString\fB)\fR
\fBTk_GetAllBindings(\fIinterp, bindingTable, object\fB)\fR
\fBTk_DeleteAllBindings(\fIbindingTable, object\fB)\fR
\fBTk_BindEvent(\fIbindingTable, eventPtr, tkwin, numObjects, objectPtr\fB)\fR
.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.
Identifies object with which binding is associated.
.AP "CONST char" *eventString in
String describing event sequence.
Tcl script to invoke when binding triggers.
Non-zero means append \fIscript\fR to existing script for binding,
if any; zero means replace existing script with new one.
X event to match against bindings in \fIbindingTable\fR.
Identifier for any window on the display where the event occurred.
Used to find display-related information such as key maps.
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.
These procedures provide a general-purpose mechanism for creating
Bindings are organized in terms of \fIbinding tables\fR.
A binding table consists of a collection of bindings plus a history
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.
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
\fBTk_DeleteBindingTable\fR frees all of the state associated
Once it returns the caller should not use the \fIbindingTable\fR
\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
\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
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.
\fBTk_DeleteBinding\fR removes from \fIbindingTable\fR the
binding given by \fIobject\fR and \fIeventString\fR, if
\fBTk_DeleteBinding\fR always returns TCL_OK.
In some cases it may reset \fIinterp->result\fR to the default
\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.
\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.
\fBTk_DeleteAllBindings\fR deletes all of the bindings in
\fIbindingTable\fR that are associated with \fIobject\fR.
\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
\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
\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.
binding, event, object, script