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