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diff --git a/plugingui/layout.h b/plugingui/layout.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            layout.h
+ *
+ *  Sat Mar 21 15:12:36 CET 2015
+ *  Copyright 2015 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 General Public License as published by
+ *  the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU 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 <cstdlib>
+
+#include "notifier.h"
+
+namespace GUI {
+
+class Layout;
+
+class LayoutItem {
+public:
+	LayoutItem();
+	virtual ~LayoutItem();
+
+	void setLayoutParent(Layout* parent);
+
+	virtual void resize(int width, int height) = 0;
+	virtual void move(size_t x, size_t y) = 0;
+	virtual int x() = 0;
+	virtual int y() = 0;
+	virtual size_t width() = 0;
+	virtual size_t height() = 0;
+
+private:
+	Layout* parent;
+};
+
+//! \brief Abtract Layout class.
+class Layout : public Listener
+{
+public:
+	Layout(LayoutItem *parent);
+	virtual ~Layout() {}
+
+	virtual void addItem(LayoutItem *item);
+	virtual void removeItem(LayoutItem *item);
+
+	//! \brief Reimplement this method to create a new Layout rule.
+	virtual void layout() = 0;
+
+protected:
+	void sizeChanged(int width, int height);
+
+	LayoutItem *parent;
+	typedef std::list<LayoutItem *> LayoutItemList;
+	LayoutItemList items;
+};
+
+//! \brief Abstract box layout
+class BoxLayout : public Layout {
+public:
+	BoxLayout(LayoutItem *parent);
+
+	//! \brief Set to false to only move the items, not scale them.
+	void setResizeChildren(bool resize_children);
+
+	void setSpacing(size_t spacing);
+
+	// From Layout:
+	virtual void layout() override  = 0;
+
+protected:
+	bool resizeChildren{false};
+	size_t spacing{0};
+};
+
+enum class HAlignment {
+	left,
+	center,
+	right,
+};
+
+//! \brief A Layout that lays out its elements vertically.
+class VBoxLayout : public BoxLayout {
+public:
+	VBoxLayout(LayoutItem *parent);
+
+	void setHAlignment(HAlignment alignment);
+
+	// From BoxLayout:
+	virtual void layout() override;
+
+protected:
+	HAlignment align;
+};
+
+enum class VAlignment {
+	top,
+	center,
+	bottom,
+};
+
+//! \brief A Layout that lays out its elements vertically.
+class HBoxLayout : public BoxLayout {
+public:
+	HBoxLayout(LayoutItem *parent);
+
+	void setVAlignment(VAlignment alignment);
+
+	// From BoxLayout:
+	virtual void layout() override;
+
+protected:
+	VAlignment align;
+};
+
+} // GUI::