toplevel open/close event
arlie
when such event is triggered?
Donal K. Fellows
> Does a toplevel have an open/close event? How do you execute a proc
> when such event is triggered?
It depends on exactly what you mean and on what platform you are
running. However, at a guess you're after <Map> and <Unmap>, or
possibly <Configure> and <Destroy> (I don't think we deliver <Create>
events at the moment, and I'm fairly sure that Tk never gives you
<Expose> events). If you're on OSX, also try <Activate> and
<Deactivate>.
Be aware that binding to a toplevel means that you also get events
directed to child widgets of that toplevel; your bindings (probably)
need to check whether '%W eq [winfo toplevel %W]' is true...
Donal.
Jonathan Bromley
<donal.k...@man.ac.uk> wrote:
>arlie wrote:
>> Does a toplevel have an open/close event? How do you execute a proc
>> when such event is triggered?
>
>It depends on exactly what you mean
The OP may also wish to check out [wm protocol] as a way to
intercept attempts to close/destroy the toplevel.
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arlie
wrote:
I'm new to Tcl/Tk. What I want is to execute a proc when a top level
opens, when it gets focus and as well when it closes. I'm developing
my program right now in MS Windows but this is also has to run on
Ubuntu and Suse linux.
Please give an example on how this is done since I have a very tight
development schedule. I need to get this up an running as soon as
possible. Thanks!
Donal K. Fellows
> I'm new to Tcl/Tk. What I want is to execute a proc when a top level
> opens, when it gets focus and as well when it closes.
OK, that helps a lot.
The events that you're looking for are:
<Map> - delivered when a window becomes usable
<FocusIn> - delivered when a window gets the focus
<Unmap> - delivered when a window becomes iconified or withdrawn
<Destroy> - delivered when a window is killed
When binding to toplevels, be aware that they get events from all
widgets inside them as well, a feature that is used for things like
keyboard accelerators, etc. In this case, this means that your
bindings will need to use %W to check who the event was sent to and
act appropriately. With <FocusIn> events, you should also use %d to
filter out events that aren't relevant (there are lots of events about
in focus management, most of which you don't need).
To try this all out, try this little script:
# Done as a procedure so that the bindings are guaranteed
# to be applied before the window is first mapped
proc setup {} {
toplevel .t
pack [entry .t.e]
bind .t <Map> {puts "mapped %W"}
bind .t <FocusIn> {puts "focus %W %d"}
bind .t <Unmap> {puts "unmapped %W"}
bind .t <Destroy> {puts "destroyed %W"}
}
setup
# Now just play around with things to make some events!
On Unix, there are also <Visibility> events which are handy for this
sort of thing. Unfortunately, they're not supported on Windows; the
underlying system simply doesn't provide the information.
Hopefully that's enough for you to figure out how to achieve what your
real goal is.
Donal.
arlie
arlie
wrote:
Me again. Where I can I find the referrence/manual for :
Bryan Oakley
> Me again. Where I can I find the referrence/manual for :
>
> The events that you're looking for are:
> <Map> - delivered when a window becomes usable
> <FocusIn> - delivered when a window gets the focus
> <Unmap> - delivered when a window becomes iconified or withdrawn
> <Destroy> - delivered when a window is killed
>
>
The bind man page.
http://www.tcl.tk/man/tcl8.4/TkCmd/bind.htm
--
Bryan Oakley
http://www.tclscripting.com
arlie
Thnaks