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 = nullptr;
      Compositor *m_compositor = nullptr;
      QPointer<View> m_mouseView;
      GrabState m_grabState = NoGrab;
      QSize m_initialSize;
      int m_resizeEdge;
      bool m_resizeAnchored;
      QPointF m_resizeAnchorPosition;
      QPointF m_mouseOffset;
      QPointF m_initialMousePos;
      View *m_dragIconView = nullptr;
  };


  #endif // COMPOSITORWINDOW_H