How do I toggle 'always on top' for a QMainWindow in Qt without causing a flicker or a flash?

Question

void MainWindow::on_actionAlways_on_Top_triggered(bool checked)
{
    Qt::WindowFlags flags = this->windowFlags();
    if (checked)
    {
        this->setWind         


        

Answer 1

Tested with

• Qt 5.2.1 on windows XP
• Qt 5.2 on OS X 10.9

    void ConsoleUI::onAllwaysTop(bool checked)
    {
        Qt::WindowFlags flags = windowFlags();
        if (checked)
        {
            flags ^= Qt::WindowStaysOnBottomHint;
            flags |= Qt::WindowStaysOnTopHint;
        }
        else
        {
            flags ^= Qt::WindowStaysOnTopHint;
            flags |= Qt::WindowStaysOnBottomHint;
        }
        setWindowFlags(flags);
        show();
    }