Qt官方示例-窗口标志

窗口的默认属性

void ControllerWindow::updatePreview()
{
    Qt::WindowFlags flags = 0;

    if (windowRadioButton->isChecked()) {
        flags = Qt::Window;
    } else if (dialogRadioButton->isChecked()) {
        flags = Qt::Dialog;
    } else if (sheetRadioButton->isChecked()) {
        flags = Qt::Sheet;
    } else if (drawerRadioButton->isChecked()) {
        flags = Qt::Drawer;
    } else if (popupRadioButton->isChecked()) {
        flags = Qt::Popup;
    } else if (toolRadioButton->isChecked()) {
        flags = Qt::Tool;
    } else if (toolTipRadioButton->isChecked()) {
        flags = Qt::ToolTip;
    } else if (splashScreenRadioButton->isChecked()) {
        flags = Qt::SplashScreen;
    }

    if (msWindowsFixedSizeDialogCheckBox->isChecked())
        flags |= Qt::MSWindowsFixedSizeDialogHint;
    if (x11BypassWindowManagerCheckBox->isChecked())
        flags |= Qt::X11BypassWindowManagerHint;
    if (framelessWindowCheckBox->isChecked())
        flags |= Qt::FramelessWindowHint;
    if (windowNoShadowCheckBox->isChecked())
        flags |= Qt::NoDropShadowWindowHint;
    if (windowTitleCheckBox->isChecked())
        flags |= Qt::WindowTitleHint;
    if (windowSystemMenuCheckBox->isChecked())
        flags |= Qt::WindowSystemMenuHint;
    if (windowMinimizeButtonCheckBox->isChecked())
        flags |= Qt::WindowMinimizeButtonHint;
    if (windowMaximizeButtonCheckBox->isChecked())
        flags |= Qt::WindowMaximizeButtonHint;
    if (windowCloseButtonCheckBox->isChecked())
        flags |= Qt::WindowCloseButtonHint;
    if (windowContextHelpButtonCheckBox->isChecked())
        flags |= Qt::WindowContextHelpButtonHint;
    if (windowShadeButtonCheckBox->isChecked())
        flags |= Qt::WindowShadeButtonHint;
    if (windowStaysOnTopCheckBox->isChecked())
        flags |= Qt::WindowStaysOnTopHint;
    if (windowStaysOnBottomCheckBox->isChecked())
        flags |= Qt::WindowStaysOnBottomHint;
    if (customizeWindowHintCheckBox->isChecked())
        flags |= Qt::CustomizeWindowHint;

    previewWindow->setWindowFlags(flags);
    ...
}

C:\Qt\{你的Qt版本}\Examples\{你的Qt版本}\widgets\widgets\windowflags

https://doc.qt.io/qt-5/qtwidgets-widgets-windowflags-example.html