RubyWPF.rb

load_assembly 'System.Core'
load_assembly 'WindowsBase'
load_assembly 'PresentationCore'
load_assembly 'PresentationFramework'
load_assembly 'System.Xaml'
load_assembly 'System.CoreEx'
load_assembly 'System.Reactive'

include System
include System::Linq
include System::Windows
include System::Windows::Controls

using_clr_extensions System
using_clr_extensions System::Linq

class RubyWindow < Window

	attr_reader :textbox, :listbox

	def initialize
		self.Title = 'Hello Ruby!'
		
		stackpanel = StackPanel.new
		@textbox = TextBox.new
		@listbox = ListBox.new
		stackpanel.children.add(@textbox)
		stackpanel.children.add(@listbox)
		self.content = stackpanel

		@textbox_changed = Observable.method(:from_event).of(TextChangedEventArgs).call(@textbox, 'TextChanged')
					
		@textbox_changed.
			select(lambda { |event| event.sender.text }).
			throttle(TimeSpan.from_seconds(1)).
			distinct_until_changed().
			observe_on_dispatcher().
			subscribe(
				lambda do |text|
					@listbox.items.add(text)
				end)
		
	end

end

window = RubyWindow.new
application = Application.new
application.run(window)