qt5base-lts/examples/qpa/windows/window.h

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#include <QWindow>
#include <QImage>

class Window : public QWindow
{
public:
    Window(QWindow *parent = 0);
    Window(QScreen *screen);

protected:
    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;

    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;

    void exposeEvent(QExposeEvent *) Q_DECL_OVERRIDE;
    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;

    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE;

private:
    void render();
    void scheduleRender();
    void initialize();

    QString m_text;
    QImage m_image;
    QPoint m_lastPos;
    int m_backgroundColorIndex;
    QBackingStore *m_backingStore;
    int m_renderTimer;
};