1 files changed, 81 insertions, 0 deletions
diff --git a/dggui/stackedwidget.h b/dggui/stackedwidget.h
new file mode 100644
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--- /dev/null
+++ b/dggui/stackedwidget.h
@@ -0,0 +1,81 @@
+/* -*- 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);
+
+	//! Returns a pointer to the Widget after the one referenced by 'widget' or
+	//! nullptr if 'widget' is the last in the list.
+	Widget* getWidgetAfter(Widget* widget);
+
+	//! Returns a pointer to the Widget beforer the one referenced by 'widget' or
+	//! nullptr if 'widget' is the first in the list.
+	Widget* getWidgetBefore(Widget* widget);
+
+	//! Reports whn a new widget is shown.
+	Notifier<Widget*> currentChanged;
+
+private:
+	//! Callback for Widget::sizeChangeNotifier
+	void sizeChanged(int width, int height);
+
+private:
+	Widget* currentWidget{nullptr};
+	std::list<Widget*> widgets;
+};
+
+} // GUI::