/****************************************************************************
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** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the examples of the Qt Wayland module
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**     distribution.
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****************************************************************************/

#ifndef COMPOSITORWINDOW_H
#define COMPOSITORWINDOW_H

#include <QOpenGLWindow>
#include <QPointer>
#include <QtGui/private/qopengltextureblitter_p.h>

QT_BEGIN_NAMESPACE

class WindowCompositor;
class WindowCompositorView;
class QOpenGLTexture;

class CompositorWindow : public QOpenGLWindow
{
public:
    CompositorWindow();

    void setCompositor(WindowCompositor *comp);

protected:
    void initializeGL() Q_DECL_OVERRIDE;
    void paintGL() Q_DECL_OVERRIDE;

    void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
    void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
    void mouseMoveEvent(QMouseEvent *e) Q_DECL_OVERRIDE;

    void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
    void keyReleaseEvent(QKeyEvent *e) Q_DECL_OVERRIDE;

private slots:
    void startMove();
    void startResize(int edge);
    void startDrag(WindowCompositorView *dragIcon);
    void setFrameOffset(const QPoint &offset);

private:
    enum GrabState { NoGrab, MoveGrab, ResizeGrab, DragGrab };

    WindowCompositorView *viewAt(const QPointF &point);
    bool mouseGrab() const { return m_grabState != NoGrab ;}
    void drawBackground();
    void sendMouseEvent(QMouseEvent *e, WindowCompositorView *target);

    QOpenGLTextureBlitter m_textureBlitter;
    QSize m_backgroundImageSize;
    QOpenGLTexture *m_backgroundTexture;
    WindowCompositor *m_compositor;
    QPointer<WindowCompositorView> m_mouseView;
    GrabState m_grabState;
    QSize m_initialSize;
    int m_resizeEdge;
    QPointF m_mouseOffset;
    QPointF m_initialMousePos;
    WindowCompositorView *m_dragIconView;
};

QT_END_NAMESPACE

#endif // COMPOSITORWINDOW_H