From: Joel VanderWerf <vjoel@...>
Date: 2002-09-15T06:07:38+09:00
Subject: FXProgressbar: how to update during lengthy task


There's surely an easy answer to this. How do you update a progress bar 
during a lengthy calculation? The examples that come with FXRuby only 
have a process bar updated while the app is idle.

The complete code is below. Just run it an type Ctrl-S. Nothing is 
saved, it's just a loop. The progress bar isn't updated until the loop 
is done. I tried wrapping the loop in a thread, and I tried calling 
#update. I'm using FXRuby 1.0.13 and fox 1.0.11 and ruby 1.6.7.

#!/usr/bin/env ruby

require "fox"
include Fox

class ViewWindow < FXMainWindow
   include Responder

   def initialize(app)
     super(app, "test", nil, nil, DECOR_ALL, 0, 0, 0, 0)

     menubar = FXMenubar.new(self, 
LAYOUT_SIDE_TOP|LAYOUT_FILL_X|FRAME_RAISED)

     @progress_target = FXDataTarget.new(0)
     @progress_bar = FXProgressBar.new(self, @progress_target,
       FXDataTarget::ID_VALUE, LAYOUT_FILL_X|PROGRESSBAR_PERCENTAGE)

     filemenu = FXMenuPane.new(self)
     FXMenuTitle.new(menubar, "&File", nil, filemenu)
     FXMenuCommand.new(filemenu, "&Save...\tCtl-S\tSave file.", nil).
       connect(SEL_COMMAND, method(:onCmdSave))
     FXMenuCommand.new(filemenu, "&Quit\tCtl-Q").
       connect(SEL_COMMAND) {getApp().exit(0)}
   end

   def onCmdSave(sender, sel, ptr)
#    Thread.new do
       20.times {|i|
         sleep(0.1)
         @progress_target.value = i
       }
#    end
     return 1
   end

   def create
     position(0, 0, 200, 100)
     super
     show
   end
end

app = FXApp.new("App", "Foo")
app.init(ARGV)
window = ViewWindow.new(app)
app.create
app.run