13 - creating a gui application with ruby-gtk.rb

O Reilly Ruby Cookbook source code

#!/usr/bin/ruby -w
# gtktrout.rb
require 'gtk2'

Gtk.init
window = Gtk::Window.new 'Tiny Ruby/GTK Application'
label = Gtk::Label.new 'You are a trout!'
window.add label 
window.signal_connect('destroy') { Gtk.main_quit }
window.show_all
Gtk.main
#---
#!/usr/bin/ruby -w
# gtk_stopwatch.rb
require 'gtk2'

class Stopwatch

  LABEL_MARKUP = '<span font_desc="16" weight="bold">%s</span>'

  def start
    @accumulated ||= 0
    @elapsed = 0
    @start = Time.now

    @mybutton.label = 'Stop'
    set_button_handler('clicked') { stop }
    @timer_stopped = false
    @timer = Thread.new do 
      until @timer_stopped do
        sleep(0.1)
        tick unless @timer_stopped
      end
    end
  end

  def stop    
    @mybutton.label = 'Start'
    set_button_handler('clicked') { start }
    @timer_stopped = true
    @accumulated += @elapsed
  end
  
  def reset
    stop
    @accumulated, @elapsed = 0, 0
    @mylabel.set_markup(LABEL_MARKUP % '00:00:00.0')
  end
 
  def tick
    @elapsed = Time.now - @start
    time = @accumulated + @elapsed
    h = sprintf('%02i', (time.to_i / 3600))
    m = sprintf('%02i', ((time.to_i % 3600) / 60))
    s = sprintf('%02i', (time.to_i % 60))
    mt = sprintf('%1i', ((time - time.to_i)*10).to_i)
    @mylabel.set_markup(LABEL_MARKUP % "#{h}:#{m}:#{s}:#{mt}")
  end
#---
  def initialize
    Gtk.init
    root = Gtk::Window.new('GTK Stopwatch')

    accel_group = Gtk::AccelGroup.new
    root.add_accel_group(accel_group)
    root.set_border_width 0

    box = Gtk::VBox.new(false, 0)
    root.add(box)
#---
    menu_factory = Gtk::ItemFactory.new(Gtk::ItemFactory::TYPE_MENU_BAR,
                                        '<main>', nil)
    menu_spec = [   
                 ['/_Program'],
                  ['/Program/_Start', '<Item>', nil, nil, lambda { start } ],
                  ['/Program/S_top', '<Item>', nil, nil, lambda { stop } ],
                  ['/Program/_Exit', '<Item>', nil, nil, 
                   lambda { Gtk.main_quit } ],
                 ['/_Reset'],
                  ['/Reset/_Reset Stopwatch', '<Item>', nil, nil, 
                   lambda { reset } ]
                ]
    menu_factory.create_items(menu_spec)                
    menu_root = menu_factory.get_widget('<main>')
    box.pack_start(menu_root)
#---
    @mylabel = Gtk::Label.new 
    @mylabel.set_markup(LABEL_MARKUP % '00:00:00.0')
    box.pack_start(@mylabel)

    @mybutton = Gtk::Button.new('Start')
    set_button_handler('clicked') { start }
    box.pack_start(@mybutton)

    root.signal_connect('destroy') { Gtk.main_quit }
    root.show_all

    Gtk.main
  end
#---
  def set_button_handler(event, &block)
    @mybutton.signal_handler_disconnect(@mybutton_handler) if @mybutton_handler
    @mybutton_handler = @mybutton.signal_connect(event, &block)    
  end
end

Stopwatch.new
#---