/*
 * Copyright (C) 2017 Robin Gareus <robin@gareus.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#ifndef __gtkmm2ext_eventbox_ext_h__
#define __gtkmm2ext_eventbox_ext_h__

#include <gtkmm/eventbox.h>

#include "gtkmm2ext/visibility.h"

namespace Gtkmm2ext {

class LIBGTKMM2EXT_API EventBoxExt : public Gtk::EventBox
{
public:
	virtual ~EventBoxExt () {}

protected:
	/* gtk2's gtk/gtkcontainer.c does not
	 * unmap child widgets if the container has a window.
	 *
	 * (this is for historical reasons and optimization
	 * because back in the day each GdkWindow was backed by
	 * an actual windowing system surface).
	 *
	 * In Ardour's case an EventBox is used in the Editor's top-level
	 * and child-widgets (e.g. Canvas::GtkCanvas never receive an unmap.
	 *
	 * However, when switching Tabbable pages, we do need to hide overlays
	 * such as ArdourCanvasOpenGLView
	 *
	 */
	void on_unmap () {
		Gtk::EventBox::on_unmap();
		if (get_child ()) {
			get_child()->unmap();
		}
	}
};

} /* namespace */

#endif