minor improve quick demo

Zhao Yuhang

2023-12-18 44fee9aa1e3087635d1394612c6f6ceab44ba7b0

 examples/mainwindow/mainwindow.h

@@ -4,11 +4,15 @@
#include <QtWidgets/QMainWindow>

class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    ~MainWindow() override;

protected:
    bool event(QEvent *event) override;

private:
    void installWindowAgent();
};