Ruby/GUI/gtk

require "gtk"
window = Gtk::Window::new
button = Gtk::Button::new("Hello, World!")
button.signal_connect(Gtk::Button::SIGNAL_CLICKED) {
  puts "Goodbye, World!"
  exit
}
window.add(button)
button.show
window.show
Gtk::main

require "gtk"
class SampleWindow < Gtk::Window
  def initialize
    super
    set_title("Ruby/GTK Sample")
    signal_connect("destroy") { Gtk::main_quit }
    entry = Gtk::Entry.new
    button = Gtk::Button.new("All Caps!")
    button.signal_connect("clicked") { cmdAllCaps(entry) }
    box = Gtk::HBox.new
    box.add(Gtk::Label.new("Text:"))
    box.add(entry)
    box.add(button)
    add(box)
    show_all
  end
  def cmdAllCaps(textField)
    textField.set_text(textField.get_text.upcase)
  end
end
SampleWindow.new
Gtk::main