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Add a EventBox wrapper to forward unmap events.

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This commit is contained in:
Robin Gareus 2017-03-20 16:30:01 +01:00
parent f69808b372
commit 235631a618
1 changed files with 58 additions and 0 deletions
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libs/gtkmm2ext/gtkmm2ext/eventboxext.h Normal file
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/*
* 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