#include <gtkmm.h>
#define TITLE "Test"

enum Size : unsigned int { WIDTH = 640, HEIGHT = 480 };

class DrawingArea : public Gtk::DrawingArea
{
	public:
		DrawingArea()
		{
			_dimensions.set_x(0);
			_dimensions.set_y(0);
			_dimensions.set_width(Size::WIDTH);
			_dimensions.set_height(Size::HEIGHT);
			set_size_request(_dimensions.get_width(), _dimensions.get_height());
			signal_draw().connect(sigc::mem_fun(*this, &DrawingArea::draw_draw));
		}

		void set_mouse()
		{
			get_window()->set_events(Gdk::EventMask::BUTTON1_MOTION_MASK);
			signal_button_press_event().connect(sigc::mem_fun(*this, &DrawingArea::draw_get_mouse));
		}

	private:
		bool draw_draw(const Cairo::RefPtr<Cairo::Context>& cr)
		{
			cr->set_source_rgb(0.0, 0.0, 0.0);
			cr->rectangle(_dimensions.get_x(), _dimensions.get_y(), _dimensions.get_width(), _dimensions.get_height());
			cr->fill();

			return true;
		}

		// this doesn't work
		bool draw_get_mouse(const GdkEventButton *button)
		{
			g_print("%0.0f\t%0.0f\n", button->x, button->y);
			return true;
		}

		Gdk::Rectangle _dimensions;
};

class Window : public Gtk::Window
{
	public:
		Window()
		{
			set_default_size(Size::WIDTH, Size::HEIGHT);
			set_title(TITLE);

			_scrolled_window.set_overlay_scrolling(true);
			_scrolled_window.set_policy(Gtk::PolicyType::POLICY_AUTOMATIC, Gtk::PolicyType::POLICY_AUTOMATIC);

			_scrolled_window.add(_drawing_area);
			add(_scrolled_window);

			_drawing_area.queue_draw();
		}

		void set_mouse()
		{
			_drawing_area.set_mouse();
		}
	private:
		Gtk::ScrolledWindow _scrolled_window;
		DrawingArea _drawing_area;
};

int main(int argc, char **argv)
{
	Glib::RefPtr<Gtk::Application> app = Gtk::Application::create();
	Window win;
	win.show_all();
	win.set_mouse();
	return app->run(win);
}