QProxyStyle with Qmenu and tray appear slowly first time

[Kaguro]

Hi Guys!
I wanna create a tray apllication with a Qmenu. I added QActions (one with icon) to QMenu. I wanted to resize the QAction's icons so i had to use a special QProxyStyle class like below, and i added it to the QMenu. When i start the application, and I make a right click at the first time on the app tray icon , the Qmenu appear slowly but only at the first time, after it, it is working perfeclty and quick.
Any advice where is my mistake(s)?
Thank you!

mainwindow.h

#include <QProxyStyle>
class MyProxyStyle: public QProxyStyle {
 public:
  MyProxyStyle(QStyle* style = 0) : QProxyStyle(style) { }
  MyProxyStyle(const QString& key) : QProxyStyle(key) { }
  virtual int pixelMetric(QStyle::PixelMetric metric, const QStyleOption* option = 0, const QWidget* widget = 0 ) const {
    switch ( metric ) {
      case QStyle::PM_SmallIconSize:
        return 40; // here u want pixmaps size i assume
      default:
        return QProxyStyle::pixelMetric( metric, option, widget ); // return default values for the rest
    }
  }

};

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:

    //system tray and menu
    QAction *minimizeAction;
    QAction *maximizeAction;
    QAction *ConnectDisconnetAction;
    QAction *quitAction;
    QSystemTrayIcon *trayIcon;
    QMenu *trayIconMenu;
    void createActions();
    void createTrayIcon();
    MyProxyStyle *mystlye;


private slots:
    //system tray and menu
    void setCur();

};

mainwindow.cpp

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    createActions();
    mystlye = new MyProxyStyle;
    createTrayIcon();

}
void MainWindow::createActions()
{
    minimizeAction = new QAction(tr("item1"), this);
    connect(minimizeAction, &QAction::triggered, this, &MainWindow::removeDocuments);
    minimizeAction->setIcon(QIcon("xy.ico"));

    maximizeAction = new QAction(tr("item2"), this);
    connect(maximizeAction, &QAction::triggered, this, &MainWindow::setPath);

    ConnectDisconnetAction = new QAction(tr("item3"), this);
    ConnectDisconnetAction->setCheckable(true);
    ConnectDisconnetAction->setChecked(true);

    connect(ConnectDisconnetAction, &QAction::triggered, this, &MainWindow::setConnectDisconnet);

    quitAction = new QAction(tr("item4"), this);
    connect(quitAction, &QAction::triggered, qApp, &QCoreApplication::quit);
}

void MainWindow::createTrayIcon()
{
    trayIconMenu = new QMenu(this);
    trayIconMenu->setStyle(mystlye);
 
    trayIconMenu->addAction(minimizeAction);
    trayIconMenu->addAction(maximizeAction);
    trayIconMenu->addAction(ConnectDisconnetAction);
    trayIconMenu->addSeparator();
    trayIconMenu->addAction(quitAction);

    trayIcon = new QSystemTrayIcon(this);

    trayIcon->setContextMenu(trayIconMenu);

    QIcon icon = QIcon("xy.ico");
    trayIcon->setIcon(icon);
    setWindowIcon(icon);
    trayIcon->setToolTip("xyz");
    trayIcon->show();

    connect(trayIconMenu, &QMenu::aboutToShow, this, &MainWindow::setCur);
}

void MainWindow::setCur()
{
    trayIconMenu->setCursor(Qt::PointingHandCursor);

}

[SGaist]

Hi,

Which version of Qt ?
On which OS ?
Do you have the same behaviour without the style ?

[Kaguro]

@SGaist QT 5.14.2, Windows 10 64bit, no without the QProxyStyle its working perfectly.

[SGaist]

Just as a test, do you have the same behaviour if you set just a QProxyStyle ?

[Christian Ehrlicher]

Or use your proxy style but don't change the icon size?

[Kaguro]

@SGaist @Christian-Ehrlicher If i use my stlye like this:

#include <QProxyStyle>
class MyProxyStyle: public QProxyStyle {
};

The problem is the same :/ it can be problam that i create this class in the mainwindow class header?

[Christian Ehrlicher]

Please provide a minimal, compilable example to reproduce your issue. I don't see why it should take longer when you simply derive from QProxyStyle.

[Kaguro]

@Christian-Ehrlicher Sorry for late! I had so many different work :( Today i will provide a minimal example! Thanks a lot! :)