QMenu doesn't show up from QAction addded to QToolBar in Qt6.

Noushadali

The following code shows up the QMenu on clicking the QToolButton in Qt5. But not in Qt6. Is this an behavioral change in Qt6 ? I could not find anything in the documentation.

import sys

from qtpy.QtWidgets import (QApplication, QAction, QMenu, QWidget,
                            QVBoxLayout, QToolBar)


class Widget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent=parent)
        layout = QVBoxLayout(self)
        toolbar = QToolBar(parent=self)

        menu = QMenu()
        menu.addAction('one')
        menu.addAction('two')
        menu.addAction('three')

        action = QAction( "Number", self)
        action.setMenu(menu)
        toolbar.addAction(action)

        layout.addWidget(toolbar)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    icons.init()
    wid = Widget()
    wid.show()
    sys.exit(app.exec())

Christian Ehrlicher

Works fine for me with Qt6.11 on windows:

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    QWidget w;
    auto layout = new QVBoxLayout(&w);
    auto tb = new QToolBar(&w);
    auto menu = new QMenu(&w);
    menu->addAction("one");
    menu->addAction("two");
    menu->addAction("three");
    auto action = new QAction("Number");
    action->setMenu(menu);
    tb->addAction(action);
    layout->addWidget(tb);
    w.show();
    return app.exec();
}

SGaist

Hi and welcome to devnet,

Can you check the same with:

import sys

from qtpy.QtWidgets import (QApplication, QAction, QMenu, QWidget,
                            QVBoxLayout, QToolBar)


class Widget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent=parent)
        layout = QVBoxLayout(self)
        toolbar = QToolBar(parent=self)

        self.menu = QMenu()
        self.menu.addAction('one')
        self.menu.addAction('two')
        self.menu.addAction('three')

        self.action = QAction( "Number", self)
        self.action.setMenu(self.menu)
        toolbar.addAction(self.action)

        layout.addWidget(toolbar)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    icons.init()
    wid = Widget()
    wid.show()
    sys.exit(app.exec())

Noushadali

Hi @Christian-Ehrlicher

Thanks for checking.

I observer this this issue on Mac, I am not sure if the behavior is different on other platforms.

Noushadali

Hi @SGaist ,

Thank you for the suggestion.

I think, I find the issue.

Setting a parent to QMenu fixed the issue.

menu = QMenu(parent=toolbar) or
menu = QMenu(parent=self).

Your suggestion - setting the menu as instance variable , also works fine for me.

Thanks again.

SGaist

It's a question of object lifetime or rather garbage collection. I have got hit by this one some years ago.