Qt鼠标悬浮Hover消息不触发，只有鼠标单击才会触发消息？

1.Qt鼠标悬浮Hover消息不触发，只有鼠标单击才会触发消息？

下面的工具配置，想要鼠标悬浮在工具菜单上时，显示删除的图标；但是发现怎么都触发不了

 bool CBaseToolListWidget::eventFilter(QObject* ptr_object, QEvent* ptr_event)
    {
        if (this == ptr_object)
        {
            QEvent::Type event_type = ptr_event->type();
            switch (event_type)
            {
            //case QEvent::Enter:
            case QEvent::HoverEnter:
            case QEvent::Move:
            case QEvent::HoverMove:
            case QEvent::MouseMove:
            {
                DealMouseHover(Hover);
            }
                break;
            case QEvent::Leave:
            case QEvent::HoverLeave:
            case QEvent::DragLeave:
            {
                DealLeave();
            }
                break;
            case QEvent::MouseButtonDblClick:
            {
                if (isEnabled()) {
                    DealClick(ptr_event);
                }
            }
                break;
//             case QEvent::Show:
//             {
//                 DealHeight();
//             }
//                break;
            case QEvent::DragMove:
            {
                DealMouseHover(DragHover);
            }
                break;
            default:
                break;
            }

        }
        else if (ptr_default_label_ == ptr_object)
        {
            if (ptr_default_label_->isVisible())
            {
                QEvent::Type event_type = ptr_event->type();
                switch (event_type)
                {
                case QEvent::DragEnter:
                case QEvent::DragMove:
                {
                    ptr_default_label_->hide();
                }
                    break;
                case QEvent::DragLeave:
                {
                    DealLeave();
                }
                    break;
                default:
                    break;
                }
            }

        }

        return QListWidget::eventFilter(ptr_object, ptr_event);
    }

 

2.解决办法

在构造函数中加入

installEventFilter(this);
setAttribute(Qt::WA_Hover, true);//这一行会使得鼠标悬浮时，触发悬浮消息，显示删除图标的问题；