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Details

Type: Bug
Resolution: Unresolved
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 5.15.7, 6.4.0, 6.7.0 Beta1
Component/s: GUI: Menus, QPA: Windows, Widgets: Styles
Labels:
None
Environment:
Windows 11

Platform/s:

Windows

Description

Qt Widget QMenu will only use correct color if the QML Qt Lab Platform Menu was loaded.

This is a Windows 11-only issue.

If developer create a regular Qt Widget project with QMenu, whatever the QMenu is a context menu or a QMenuBar menu, it will always using a incorrect color palette, with black text on deep blue background, and gray background:

If user adds a QQmlApplicationEngine instance and add a MenuBar and any Menu entry from Qt.labs.platform, even if the QML part is not visible, the QtWidget window will now have its correct menu color palette:

the sample code:

#include "mainwindow.h"

#include <QApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

//    // Uncomment this QML part to get a correct *QtWidget* QMenu
//    QQmlApplicationEngine engine;
//    engine.loadData(R"(
//    import QtQuick 2
//    import QtQuick.Controls 2
//    import Qt.labs.platform 1 as Platform

//    ApplicationWindow{
//        visible: true
//        title: "Qt QML"
//        width: 350
//        height: 200
//        color: systemPalette.window
//        SystemPalette { id: systemPalette; }
//        Platform.MenuBar {
//            Platform.Menu {
//                title: qsTr("&File")

//                Platform.MenuItem {
//                    text: qsTr("&Open")
//                    shortcut: StandardKey.Open
//                }
//                Platform.MenuItem {
//                    text: qsTr("&Quit")
//                }
//            }
//        }
//    }
//    )");

    // a regular Qt Widget window created via the default QtCreator New Project wizard
    // and just add a menu via the designer so you can test it out.
    MainWindow w;
    w.show();

    return a.exec();
}