tkwindow_observer.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
require 'tk'
require 'observer'

class TkWindow_Main

  def initialize()
    @root = TkRoot.new {
      title 'Root'
      resizable [0,0]
    }
    
    @wdg_txt = TkText.new(@root).pack
    @wdg_txt.insert('end', "Editしてください")
    @wdg_txt.state 'disabled'

    TkButton.new(@root,
      'text' =>  "Edit",
      'command' => proc {
                   TkWindow_Sub.new(self)
                   }
    ).pack
  end

  def update(text)
    @wdg_txt.state 'normal'
    @wdg_txt.delete('1.0', 'end')
    @wdg_txt.insert('end', text)
    @wdg_txt.state 'disabled'
  end
  
end

class TkWindow_Sub
  include Observable

  def initialize(parent=nil)
    @parent = parent
    add_observer(@parent)
    sub_window = TkToplevel.new() {
      title 'Sub Window'
      resizable [0,0]
    }

    TkButton.new(sub_window,
      'text' => "Finish",
      'command' => proc {
                   changed
                   notify_observers('Bye')
                   sub_window.destroy
                 }
                 ).pack
  end
end

if $0 == __FILE__
  TkWindow_Main.new()
  Tk.mainloop
end