From: David Bailey <david.bailey@...>
Date: 2006-03-27T23:14:23+09:00
Subject: Callback For A Timer Event To Display Widget in Ruby/Tk

Kind All,

Um, I need to code an elapsed time display in Ruby/Tk.

It was straightforward to use the Time class and the Time#srtftime 
method to get the time in just the form I wanted: t = Time.new; puts 
"Time is #{t.strftime("%I:%M:%S %p")}"

Likewise, for displaying the string in a TkLabel widget: 
TkLabel.new(canvas, 'text'=>"The time is #{t.strftime("%I:%M:%S %p")}" 
).pack( 'side'=>'top', 'padx'=>15, 'pady'=>15 )

It was also easy to understand binding in general: root.bind('q') { exit 
}.

Or to setup a callback for a TkButton press: myButton = 
TkButton.new(root, 'text'=>'Click me!', 'command'=> proc  { btnProc() 
}).place( 'x'=>x, 'y'=>y, 'width'=>w, 'height'=>h )

But, I have searched high and low, and I can not find out how to set up 
a callback for a timer event.  I just want to display a time string on 
the TkCanvas or TkTopLevel window once per second.  I have gone through 
a Perl/Tk reference book and I'm still having trouble figuring out how 
to "translate" this into Ruby/Tk.

I'll of course keep searching and trying stuff, but if anyone 
knowledgeable has a code example of how to this, or can point me to one, 
or point me to a reference to the technique, I'd be grateful.  Thank you 
and best regards,

David

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