raw/mann/bindtags.n

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 208 .SH "STANDARD OPTIONS"
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 226 Command-Line Name:      \\fB\\$1\\fR
 227 Database Name:  \\fB\\$2\\fR
 228 Database Class: \\fB\\$3\\fR
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 246 .TH bindtags n 4.0 Tk "Tk Built-In Commands"
 247 .BS
 248 '\" Note:  do not modify the .SH NAME line immediately below!
 249 .SH NAME
 250 bindtags \- Determine which bindings apply to a window, and order of evaluation
 251 .SH SYNOPSIS
 252 \fBbindtags \fIwindow \fR?\fItagList\fR?
 253 .BE
 254
 255 .SH DESCRIPTION
 256 .PP
 257 When a binding is created with the \fBbind\fR command, it is
 258 associated either with a particular window such as \fB.a.b.c\fR,
 259 a class name such as \fBButton\fR, the keyword \fBall\fR, or any
 260 other string.
 261 All of these forms are called \fIbinding tags\fR.
 262 Each window contains a list of binding tags that determine how
 263 events are processed for the window.
 264 When an event occurs in a window, it is applied to each of the
 265 window's tags in order:  for each tag, the most specific binding
 266 that matches the given tag and event is executed.
 267 See the \fBbind\fR command for more information on the matching
 268 process.
 269 .PP
 270 By default, each window has four binding tags consisting of the
 271 name of the window, the window's class name, the name of the window's
 272 nearest toplevel ancestor, and \fBall\fR, in that order.
 273 Toplevel windows have only three tags by default, since the toplevel
 274 name is the same as that of the window.
 275 The \fBbindtags\fR command allows the binding tags for a window to be
 276 read and modified.
 277 .PP
 278 If \fBbindtags\fR is invoked with only one argument, then the
 279 current set of binding tags for \fIwindow\fR is returned as a list.
 280 If the \fItagList\fR argument is specified to \fBbindtags\fR,
 281 then it must be a proper list; the tags for \fIwindow\fR are changed
 282 to the elements of the list.
 283 The elements of \fItagList\fR may be arbitrary strings;  however,
 284 any tag starting with a dot is treated as the name of a window;  if
 285 no window by that name exists at the time an event is processed,
 286 then the tag is ignored for that event.
 287 The order of the elements in \fItagList\fR determines the order in
 288 which binding scripts are executed in response to events.
 289 For example, the command
 290 .CS
 291 \fBbindtags .b {all . Button .b}\fR
 292 .CE
 293 reverses the order in which binding scripts will be evaluated for
 294 a button named \fB.b\fR so that \fBall\fR bindings are invoked
 295 first, following by bindings for \fB.b\fR's toplevel (``.''), followed by
 296 class bindings, followed by bindings for \fB.b\fR.
 297 If \fItagList\fR is an empty list then the binding tags for \fIwindow\fR
 298 are returned to the default state described above.
 299 .PP
 300 The \fBbindtags\fR command may be used to introduce arbitrary
 301 additional binding tags for a window, or to remove standard tags.
 302 For example, the command
 303 .CS
 304 \fBbindtags .b {.b TrickyButton . all}\fR
 305 .CE
 306 replaces the \fBButton\fR tag for \fB.b\fR with \fBTrickyButton\fR.
 307 This means that the default widget bindings for buttons, which are
 308 associated with the \fBButton\fR tag, will no longer apply to \fB.b\fR,
 309 but any bindings associated with \fBTrickyButton\fR (perhaps some
 310 new button behavior) will apply.
 311
 312 .SH "SEE ALSO"
 313 bind
 314
 315 .SH KEYWORDS
 316 binding, event, tag