window.h Example File

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#ifndef COMPOSITORWINDOW_H
#define COMPOSITORWINDOW_H
#include <QOpenGLWindow>
#include <QPointer>
#include <QOpenGLTextureBlitter>
class Compositor;
class View;
class QOpenGLTexture;
class Window : public QOpenGLWindow
{
public:
    Window();
    void setCompositor(Compositor *comp);
protected:
    void initializeGL() override;
    void paintGL() override;
    void mousePressEvent(QMouseEvent *e) override;
    void mouseReleaseEvent(QMouseEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void keyPressEvent(QKeyEvent *e) override;
    void keyReleaseEvent(QKeyEvent *e) override;
private slots:
    void startMove();
    void startResize(int edge, bool anchored);
    void startDrag(View *dragIcon);
private:
    enum GrabState { NoGrab, MoveGrab, ResizeGrab, DragGrab };
    View *viewAt(const QPointF &point);
    bool mouseGrab() const { return m_grabState != NoGrab ;}
    void drawBackground();
    void sendMouseEvent(QMouseEvent *e, View *target);
    static QPointF getAnchoredPosition(const QPointF &anchorPosition, int resizeEdge, const QSize &windowSize);
    static QPointF getAnchorPosition(const QPointF &position, int resizeEdge, const QSize &windowSize);
    QOpenGLTextureBlitter m_textureBlitter;
    QSize m_backgroundImageSize;
    QOpenGLTexture *m_backgroundTexture;
    Compositor *m_compositor;
    QPointer<View> m_mouseView;
    GrabState m_grabState;
    QSize m_initialSize;
    int m_resizeEdge;
    bool m_resizeAnchored;
    QPointF m_resizeAnchorPosition;
    QPointF m_mouseOffset;
    QPointF m_initialMousePos;
    View *m_dragIconView;
};
#endif // COMPOSITORWINDOW_H