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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * stackedwidget.h
+ *
+ * Mon Nov 21 19:36:49 CET 2016
+ * Copyright 2016 Bent Bisballe Nyeng
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DrumGizmo 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#pragma once
+
+#include <list>
+
+#include "widget.h"
+#include "notifier.h"
+
+namespace GUI
+{
+
+//! A StackedWidget is a widget containing a list of widgets but only showing
+//! one of them at a time.
+//! It is be used to implement a TabWidget but can also be used for other
+//! purposes.
+class StackedWidget
+ : public Widget
+{
+public:
+ StackedWidget(Widget *parent);
+ ~StackedWidget();
+
+ //! Add a widget to the stack.
+ void addWidget(Widget *widget);
+
+ //! Remove a widget from the stack.
+ void removeWidget(Widget *widget);
+
+ //! Get currently visible widget.
+ Widget *getCurrentWidget() const;
+
+ //! Show widget. Hide all the others.
+ //! If widget is not in the stack nothing happens.
+ void setCurrentWidget(Widget *widget);
+
+ //! Reports whn a new widget is shown.
+ Notifier<Widget*> currentChanged;
+
+private:
+ Widget* currentWidget{nullptr};
+ std::list<Widget*> widgets;
+};
+
+} // GUI::