Simple Qt application written the Ruby way...

qtapp.rb

require 'Qt4'

app = QApplication.new([]) do
  window = QMainWindow.new do
    button = QPushButton.new("Quit") do
      connect(self, :clicked) { qApp.quit }
    end
    set_central_widget(button)
    set_window_title("Qt Application - The Ruby Way")
    resize(300,200)
    show
  end
  exec
end