我想在鼠标悬停时更改QScrollBar样式。我试图通过添加eventFilter让它工作，但它不起作用。代码:qApp->installEventFilter(this);boolTest::eventFilter(QObject*object,QEvent*event){if(event->type()==QEvent::Scroll){QScrollEvent*scrollEvent=static_cast(event);if(scrollEvent->scrollState()==QScrollEvent::Enter){qDebug()setStyleSheet("QScro