Qt遍历子组件为setMouseTracking()

void setMouseTrackingRecursively(QWidget* widget) {
    if (widget == nullptr)
        return;
    widget->setMouseTracking(true);
    const QObjectList& children = widget->children();
    for (QObject* child : children) {
        if (child->isWidgetType()) {
            setMouseTrackingRecursively(qobject_cast<QWidget*>(child));
        }
    }
}