bindtags (n)
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 Button, 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
nearest 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 argument 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.
SEE ALSO
KEYWORDS
binding, event, tag
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