From: Graham Stokes <graham_stokes@...>
Date: 2006-11-12T23:01:47+09:00
Subject: Why won't my FXRuby widgets update?

Hi,

Anybody out there faced this ? (the code below is actually just the core 
of the "babelfish" example). But there's a "flaw" in the code that isn't 
mentioned in the documentation. Specifically, when the button press 
invokes procAll, any updates to the widgets are sort of "queued up" 
until procAll finishes and only then are they applied - I discovered 
this by painstaking trial and error. What if I want procAll to go away 
and process a load of stuff that might take 20 minutes, but I want to 
update the screen with messages about progress and stuff. I just find 
that I get nothing until procAll  ends. Clearly I've missed a step with 
setting up the messaging, but the documentation is persuading me that 
there's nothing more to do.

Can anybody tell me what's wrong with the code below ? Why won't the 
text field show the text as soon as the data target is updated as the 
documentation implies it will ? Other widgets behave in a similar 
fashion with the exception of the progress bar which will update 
immediately. Very peculiar. Any help appreciated.

Regards,
Graham Stokes

#!/usr/bin/env ruby
require 'fox16'
include Fox

class Update_test < FXMainWindow

  def initialize(app)
    super(app, "Test", nil, nil, DECOR_ALL,
      0, 0, 600, 400, 0, 0)
    controlsFrame = FXHorizontalFrame.new(self,
      LAYOUT_SIDE_BOTTOM|LAYOUT_FILL_X)

    btn = FXButton.new(controlsFrame, "Go", nil, nil, 0,
      BUTTON_NORMAL|LAYOUT_SIDE_RIGHT)
    btn.connect(SEL_COMMAND, method (:procAll))

    bottomFrame = FXVerticalFrame.new(self, LAYOUT_FILL_X|LAYOUT_FILL_Y)
    FXLabel.new(bottomFrame, "Text:", nil, LAYOUT_FILL_X)
    sunkenFrame = FXHorizontalFrame.new(bottomFrame,
      FRAME_SUNKEN|FRAME_THICK|LAYOUT_FILL_X|LAYOUT_FILL_Y)
    @stringVal = FXDataTarget.new("", nil, 0)
    @translatedText = FXText.new(sunkenFrame, @stringVal, 
FXDataTarget::ID_VALUE,
      TEXT_READONLY|LAYOUT_FILL_X|LAYOUT_FILL_Y)
  end

  def create
    super
    show(PLACEMENT_CURSOR)
  end

  def procAll(sender, sel, ptr)
     @stringVal.value += "This is new text\n"   # This doesn't appear
     <20-minutes-processing here>
  end                                           # until here. Why is 
this ?

end

if __FILE__ == $0
  application = FXApp.new("Test", "Test")
  window = Update_test.new(application)
  application.create
  application.run
end

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