11-27-2012
Do we have better sense now of whether the change in the icons has actually improved the situation of requesting to add (or moderators themselves actually applying) code tags?
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LEARN ABOUT MOJAVE
bindtags
bindtags(n) Tk Built-In Commands bindtags(n)
__________________________________________________________________________________________________________________________________________________
NAME
bindtags - Determine which bindings apply to a window, and order of evaluation
SYNOPSIS
bindtags window ?tagList?
_________________________________________________________________
DESCRIPTION
When a binding is created with the bind command, it is associated either with a particular window such as .a.b.c, a class name such as But-
ton, the keyword all, or any other string. All of these forms are called binding tags. Each window contains a list of binding tags that
determine how events are processed for the window. When an event occurs in a window, it is applied to each of the window's tags in order:
for each tag, the most specific binding that matches the given tag and event is executed. See the bind command for more information on the
matching process.
By default, each window has four binding tags consisting of the name of the window, the window's class name, the name of the window's near-
est toplevel ancestor, and all, in that order. Toplevel windows have only three tags by default, since the toplevel name is the same as
that of the window. The bindtags command allows the binding tags for a window to be read and modified.
If bindtags is invoked with only one argument, then the current set of binding tags for window is returned as a list. If the tagList argu-
ment is specified to bindtags, then it must be a proper list; the tags for window are changed to the elements of the list. The elements of
tagList may be arbitrary strings; however, any tag starting with a dot is treated as the name of a window; if no window by that name
exists at the time an event is processed, then the tag is ignored for that event. The order of the elements in tagList determines the
order in which binding scripts are executed in response to events. For example, the command
bindtags .b {all . Button .b}
reverses the order in which binding scripts will be evaluated for a button named .b so that all bindings are invoked first, following by
bindings for .b's toplevel ("."), followed by class bindings, followed by bindings for .b. If tagList is an empty list then the binding
tags for window are returned to the default state described above.
The bindtags command may be used to introduce arbitrary additional binding tags for a window, or to remove standard tags. For example, the
command
bindtags .b {.b TrickyButton . all}
replaces the Button tag for .b with TrickyButton. This means that the default widget bindings for buttons, which are associated with the
Button tag, will no longer apply to .b, but any bindings associated with TrickyButton (perhaps some new button behavior) will apply.
EXAMPLE
If you have a set of nested frame widgets and you want events sent to a button widget to also be delivered to all the widgets up to the
current toplevel (in contrast to Tk's default behavior, where events are not delivered to those intermediate windows) to make it easier to
have accelerators that are only active for part of a window, you could use a helper procedure like this to help set things up:
proc setupBindtagsForTreeDelivery {widget} {
set tags [list $widget [winfo class $widget]]
set w $widget
set t [winfo toplevel $w]
while {$w ne $t} {
set w [winfo parent $w]
lappend tags $w
}
lappend tags all
bindtags $widget $tags
}
SEE ALSO
bind(n)
KEYWORDS
binding, event, tag
Tk 4.0 bindtags(n)