blog.onlysimpler.com

Here's a simple JRuby application that shows how to integrate Ruby with Java Swing.

include Java

include_class java.awt.event.ActionListener
include_class java.lang.Runnable
include_class javax.swing.JButton
include_class javax.swing.JFrame
include_class javax.swing.JPanel
include_class javax.swing.JProgressBar
include_class javax.swing.JOptionPane
include_class javax.swing.SwingUtilities

class JRubySwing

  def initialize

    button = JButton.new("Click Me!")
    progress_bar = JProgressBar.new(0,100)

    button.add_action_listener(ActionListener.impl {
      button.set_enabled(false)
      time_consuming_method(progress_bar,button)
    })
    
    panel = JPanel.new
    panel.add(button)
    panel.add(progress_bar)

    frame = JFrame.new("Hello Swing")
    frame.get_content_pane.add(panel)
    frame.set_default_close_operation(JFrame::EXIT_ON_CLOSE)
    frame.pack
    frame.set_location_relative_to(nil)
    frame.visible = true

  end
  
  def time_consuming_method(progress_bar,button)

    t = java.lang.Thread.new(r = Runnable.impl {
      1.upto 100 do |i|
        sleep(0.01)
        progress_bar.set_value(i)
      end
      SwingUtilities.invokeLater(Runnable.impl { button.set_enabled(true) })
    })
    t.start
    
  end

end

JRubySwing.new