Cleanup

samples/button.rb

@@ -58,12 +58,18 @@ rect.click do
 end
 
 App.map_key :mouse_left, :action_name
+App.map_key :q, :quit
 
 start = Time.now
 c_ = 0.0
 c_c = 0
 
 App.update do |delta_time|
+  if App.pressed?(:quit)
+    App.exit!
+    next
+  end
+
   c_ += delta_time
   c_c += 1
 
@@ -114,4 +120,4 @@ p "Average delta time: #{c_ / c_c}s"
 p "Average FPS (real): #{c_c / time}s"
 p "Average FPS (from dt): #{c_c / c_}"
 p "Time since start (real): #{time}s"
-p "Time since start (from dt): #{c_}s"
+p "Time since start (from dt): #{c_}s"