2 * Copyright (C) 2017 Robin Gareus <robin@gareus.org>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 #ifndef _WIDGETS_EVENTBOX_EXT_H_
20 #define _WIDGETS_EVENTBOX_EXT_H_
22 #include <gtkmm/eventbox.h>
24 #include "widgets/visibility.h"
26 namespace ArdourWidgets {
28 class LIBWIDGETS_API EventBoxExt : public Gtk::EventBox
32 virtual ~EventBoxExt () {}
35 /* gtk2's gtk/gtkcontainer.c does not
36 * unmap child widgets if the container has a window.
38 * (this is for historical reasons and optimization
39 * because back in the day each GdkWindow was backed by
40 * an actual windowing system surface).
42 * In Ardour's case an EventBox is used in the Editor's top-level
43 * and child-widgets (e.g. Canvas::GtkCanvas never receive an unmap.
45 * However, when switching Tabbable pages, we do need to hide overlays
46 * such as ArdourCanvasOpenGLView
50 Gtk::EventBox::on_unmap();