From: "Cameron, Gemma (UK)" <Gemma.Cameron@...>
Date: 2006-09-27T23:57:22+09:00
Subject: Re: Feedback messages to user using Tk...



6. Now call Tk.mainloop

^^ I think maybe that's where I was going wrong. I wrote a unit test to
test the updating of the label. My code looked something like this:

class GraphicalProgress
  def initialize
    root = TkRoot.new { title 'Progress' }
    @my_label = tkLabel.new(root)
    @my_label.configure('text'=>'Waiting for something to report...')
    @my_label.pack

    Tk.mainloop
  end

  def update(message)
    @my_label.configure('text'=>'Waiting for something to report...')
  end
end

Unit Test:

@progress = GraphicalProgress.new 
@progress.update('I'm doing something')
@progress.update('I'm done')

And because the loop is in the initialize method, only when the app is
closed do we get to the line which requests the text is update. Of
course this falls over as the widget has been destroyed...

So with your suggestion the code should be something like this...

class GraphicalProgress
  def initialize
    root = TkRoot.new { title 'Progress' }
    @my_label = tkLabel.new(root)
    @my_label.configure('text'=>'Waiting for something to report...')
    @my_label.pack
  end

  def update(message)
    @my_label.configure('text'=>'Waiting for something to report...')
  end
end

Unit Test:

@progress = GraphicalProgress.new 
@progress.update('I'm doing something')
@progress.update('I'm done')
Tk.mainloop

Or have I got the wrong end of the stick?

Thanks so much for your help!


Gem

-----Original Message-----
From: Morton Goldberg [mailto:m_goldberg@ameritech.net]
Sent: 27 September 2006 15:22
To: ruby-talk ML
Subject: Re: Feedback messages to user using Tk...

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On Sep 27, 2006, at 9:28 AM, Cameron, Gemma (UK) wrote:

> Thanks a lot Morton, I'll have a look at this widget when I get home (

> :
>
> I had tried something similar to what you suggested with a method, but

> there was no way of triggering it - i think i needed to perhaps run it

> as a seperate process...

I hope not. That will complicate things quite a bit. Before you do that
I would suggest trying the following:

1. Expose the label by supplying and attribute reader for it in the
window class OR provide a public method in the window to update the
label (like btn_action but accepting a string argument).
2. Provide your file zipper class with code that either directly updates
the label or calls the update method in the window class.
3. Don't call Tk.mainloop in your window class.
4. Create the window object.
5. Create the file zipper object, passing the window object in 'new'.
6. Now call Tk.mainloop

Regards, Morton







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