ISO: ways to figure out a widget type

[Larry W. Virden]

Someone I know is writing some tcl code that needs to know what kind of
a widget a particular widget is . That is to say, if the path .t.p1.s2
were passed, he needs to figure out what code is needed to determine
whether the widget is a slider, or a button, or a label, etc.

[Arjen Markus]

Use the [winfo class] command:

button .b
winfo class .b
==> Button

Regards,

Arjen

[Ralf Fassel]

* "Larry W. Virden" <lvi...@gmail.com>

| That is to say, if the path .t.p1.s2 were passed, he needs to figure
| out what code is needed to determine whether the widget is a slider,
| or a button, or a label, etc.

% label .w
% winfo class .w
=> Label

R'

[Joe English]

Depending on what it is he's trying to do, he might be
better off using virtual events and class bindings, e.g.,:

bind Button <<DoSomething>> { ... code for button widgets ... }
bind Label <<DoSomething>> { ... code for label widgets ... }
...
event generate .t.p1.s2 <<DoSomething>>

Without knowing the details of the problem in question it's
hard to say whether this approach is appropriate or not;
but personally I've always found this technique to be far
superior to switching on [winfo class $w].

--Joe English

[Ralf Fassel]

* jeng...@flightlab.com (Joe English)

| Depending on what it is he's trying to do, he might be
| better off using virtual events and class bindings, e.g.,:
|
| bind Button <<DoSomething>> { ... code for button widgets ... }
| bind Label <<DoSomething>> { ... code for label widgets ... }
| ...
| event generate .t.p1.s2 <<DoSomething>>

Nice one.
R'