Made it crash when you press 'Quit'

src/lib/keyhook.rb

@@ -3,6 +3,8 @@ def nullmethod
 	return
 end
 
+# TODO: use Object.create_method
+# https://apidock.com/ruby/Module/define_method
 
 # Handler for key events
 class KeyHook

src/lib/ui.rb

@@ -73,6 +73,15 @@ class Button < UI
 		@events = {}
 	end
 
+	def onclick
+	end
+	
+	# TODO: make this work
+	# TODO: make this also work for KeyHooks
+	def set_onclick(name, &block)
+		self.class.send(:define_method, name, &block)
+	end
+
 	def hover?
 		inx = window.mouse_x >= self.x && window.mouse_x <= self.x + self.width
 		iny = window.mouse_y >= self.y - self.padding[:y] && window.mouse_y <= self.y + self.height + self.padding[:y]
@@ -82,14 +91,6 @@ class Button < UI
 		self.selected = inx && iny
 	end
 
-	def add_event(event_sym, method_ptr)
-		self.events[event_sym] = method_ptr
-	end
-
-	def onevent(event_sym, *args, **kwargs)
-		self.events[event_sym].(*args, **kwargs)
-	end
-
 	def render
 		sel = self.hover? ? :selected : :default
 		self.draw_rect(0, 0, self.width, self.height, self.colors[:background][sel])

src/ui/mainmenu.rb

@@ -19,6 +19,9 @@ class MainMenu < UI
 
 		@quitbtn = Button.new(self.window, self, "Quit", self.window.fonts[:button])
 		@quitbtn.x, @quitbtn.y = self.width/2 - @quitbtn.width/2, @quitbtn.height + @playbtn.y + 16
+		@quitbtn.create_method(:onclick) {
+			@window.close
+		}
 	end