class CalculatorWindow : public ApplicationWindow {
	public:
				CalculatorWindow(	const Rect &rFrame,
									const String& szTitle,
									unsigned int nWindowLayoutFlags,
									unsigned int uiFlags = 0);
		void    OnCommand(			const MessageCommand *pMessage);
	private:
		void	Clear();
		void	doOperation(		int next_operation);
		
		TextView	*	pText;
		String		*	line;
		double 			total;
		double			operand;
		int 			operation;
		bool 			new_operand;
};