private:
Rect normalrect;

public:
Rect &GetNormalWindowRect(){ return normalrect; }

void SetNormalWindowRect(Rect &rect){ 
	normalrect=rect; 
	if (!IsMaximized() && !IsMinimized() && !IsFullScreen() && IsShown()) SetRect(rect);
}

virtual void Layout(){ 
	// or where ever the following belongs so that it 
	// gets properly executed even when the virtual Layout() 
	// function gets overridden in an inherited class
	...
	if (!IsMaximized() && !IsMinimized() && !IsFullScreen() && IsShown()) normalrect = GetRect();
	...
}