Hide QMainWindow without removing taskbar icon?

[ComaWhite]

Here is what I have to do it for me

void
MainWindow::closeEvent(QCloseEvent *event) {
    if (Settings::enableSystemTray()) {
        if (Settings::minimizeToTrayOnClose()) {
            hide();
            event->ignore();
        }
    } else {
        KXmlGuiWindow::closeEvent(event);
    }
}

void
MainWindow::closeEvent(QCloseEvent *event) {
    if (Settings::enableSystemTray()) {
        if (Settings::minimizeToTrayOnClose()) {
            hide();
            event->ignore();
        }
    } else {
        KXmlGuiWindow::closeEvent(event);
    }
}

To copy to clipboard, switch view to plain text mode 

Just replace KXmlGuiWindow with QMainWindow since KXmlGuiWindow is KDE code