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class MyArea < Iu::Components::Area
    def initialize(width = nil, height = width)
      @blah = "blah"
      super(width, height)
    end

    def on_draw(params : UI::AreaDrawParams)
       puts @blah
    end

    def on_mouse_event(mouse_event : UI::AreaMouseEvent);end
    def on_mouse_crossed(left : Bool);end
    def on_drag_broken;end
    def on_key_event(key_event : UI::AreaKeyEvent);end
end

@@on_mouse_event_cb = Proc(UI::AreaHandler*, UI::Area*, UI::AreaMouseEvent*, Nil).new { |h, a, e|
        # h.value.data.as(Area*).value.on_mouse_event(e.value).as(Nil)
        ::Box(Area).unbox(h.value.data).on_mouse_event(e.value).as(Nil)
}

# @handler.data = self.as(Void*)
@handler.data = ::Box.box(self)