#include <CtrlLib/CtrlLib.h>

using namespace Upp;

struct MyApp : TopWindow  {
	Point pos = Null;
	bool pressed = false;
	Rect target  = Null;
	MyApp()
	{
		Sizeable().Zoomable().CenterScreen().SetRect(0, 0, 400, 400);
	}
	
	void Paint(Draw& w) override
	{
		w.DrawRect(GetView(), Black());
		w.DrawRect(target, pressed ? Green() : target.Contains(pos) ? Red() :  White());
	}
	
	void Layout() override
	{
		Rect r = GetView();
		target = r.CenterRect(r.GetSize() / 4);
	}
	
	void LeftDown(Point pt, dword) override
	{
		SetCapture();
		pressed = target.Contains(pt);
		Refresh();
	}
	
	void LeftUp(Point pt, dword) override
	{
		ReleaseCapture();
		pressed = false;
		Refresh();
	}
	
	void MouseMove(Point pt, dword) override
	{
		pos = pt;
		Refresh();
	}
};

GUI_APP_MAIN
{
	MyApp().Run();
}