hotcocoa.rb

require 'hotcocoa'
include HotCocoa
application do |app|
  window :size => [200, 100] do |win|
    win.view = layout_view :mode => :vertical do |layout|
      layout.spacing = 10

      btn = button(:title => "click me", :layout => {:align => :center})
      lbl = label(:text => "text", :layout => {:align => :center})

      btn.on_action do |b|
        if lbl == "text" || lbl == "World foo"
          lbl.text = "Hello"
        else
          lbl.text = "World foo"
        end
      end

      layout << btn
      layout << lbl
    end
    win.will_close { exit }
  end
end