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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Wayland module
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef COMPOSITOR_H
+#define COMPOSITOR_H
+
+#include <QtCore/QPointer>
+
+#include <QtWaylandCompositor/QWaylandCompositor>
+#include <QtWaylandCompositor/QWaylandSurface>
+#include <QtWaylandCompositor/QWaylandView>
+
+QT_BEGIN_NAMESPACE
+
+class Window;
+class QOpenGLTexture;
+class QWaylandXdgShell;
+class QWaylandXdgSurface;
+class QWaylandXdgToplevel;
+
+class View : public QWaylandView
+{
+    Q_OBJECT
+public:
+    explicit View() = default;
+    QOpenGLTexture *getTexture();
+    QSize size() const { return surface() ? surface()->size() : QSize(); }
+    QRect globalGeometry() const { return {globalPosition(), surface()->size()}; }
+    QPoint globalPosition() const { return m_globalPosition; }
+    void setGlobalPosition(const QPoint &position);
+    QPoint mapToLocal(const QPoint &globalPosition) const;
+    void setAnchorEdges(Qt::Edges edges) { m_anchorEdges = edges; }
+    void updateAnchoredPosition();
+
+    virtual void handleResizeMove(const QPoint &delta);
+    virtual void handleResizeRelease() {}
+
+signals:
+    void globalPositionChanged();
+    void startResize();
+    void startMove();
+
+private:
+    QOpenGLTexture *m_texture = nullptr;
+    QPoint m_globalPosition;
+    Qt::Edges m_anchorEdges;
+    QSize m_lastSize;
+};
+
+class ToplevelView : public View
+{
+    Q_OBJECT
+public:
+    explicit ToplevelView(QWaylandXdgToplevel *toplevel);
+    void handleResizeMove(const QPoint &delta) override;
+    void handleResizeRelease() override;
+
+private:
+    QWaylandXdgToplevel *m_toplevel = nullptr;
+    struct Resize  {
+        QSize initialSize;
+        Qt::Edges edges;
+    } m_resize;
+};
+
+class Compositor : public QWaylandCompositor
+{
+    Q_OBJECT
+public:
+    explicit Compositor() = default;
+    ~Compositor() override;
+    void create() override;
+    void setWindow(Window *window) { m_window = window; }
+
+    QList<View *> views() const { return m_views; }
+    View *viewAt(const QPoint &position);
+
+    void raise(View *view);
+
+    void handleGlInitialized() { create(); }
+    void handleMousePress(const QPoint &position, Qt::MouseButton button);
+    void handleMouseRelease(const QPoint &position, Qt::MouseButton button, Qt::MouseButtons buttons);
+    void handleMouseMove(const QPoint &position);
+    void handleMouseWheel(Qt::Orientation orientation, int delta);
+
+    void handleKeyPress(quint32 nativeScanCode);
+    void handleKeyRelease(quint32 nativeScanCode);
+
+signals:
+    void startMove();
+
+private slots:
+    void handleXdgToplevelCreated(QWaylandXdgToplevel *toplevel, QWaylandXdgSurface *xdgSurface);
+    void addView(View *view);
+    void handleViewSurfaceDestroyed();
+    void triggerRender();
+
+private:
+    Window *m_window = nullptr;
+    QWaylandXdgShell *m_xdgShell = nullptr;
+    QList<View *> m_views; // Sorted by painters algorithm (back to front)
+    struct Grab {
+        QPointer<View> view;
+        enum State { None, Input, Move, Resize };
+        State state = None;
+        QPoint startLocalPosition; // in View's coordinate system
+        QPoint startGlobalPosition;
+    } m_grab;
+};
+
+QT_END_NAMESPACE
+
+#endif // COMPOSITOR_H