require 'gtk'

window = Gtk::Window.new(Gtk::WINDOW_TOPLEVEL)
button = Gtk::Button.new('Hello World')

window.signal_connect('delete_event') {
  print "delete event occurred\n"
  false
}

button.signal_connect('destroy') {
  print "destroy\n"
  exit
}

button.signal_connect('clicked') {
  print "Hello World\n"
}

window.add button
button.show
window.show
Gtk.main