window.h Example File

qwindow-compositor/window.h
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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