QT how to detect whether the mouse is on a control

Mode one ： recommend , I feel that this event filter method is sensitive

Remember to install the event filter

this->installEventFilter(this);

protected:
    bool eventFilter(QObject *obj, QEvent *event) override;

    // Events to be filtered 
    if (event->type() == QEvent::MouseMove)
    {
        QMouseEvent* mouseEvent = (QMouseEvent*)event;
        QPoint p = mouseEvent->pos();
        int x = m_LightAddrAndDmxList.value(m_iCurrentTablevie)->x();
        int y = m_LightAddrAndDmxList.value(m_iCurrentTablevie)->y();
        int w =m_LightAddrAndDmxList.value(m_iCurrentTablevie)->w();
        int h = m_LightAddrAndDmxList.value(m_iCurrentTablevie)->h();
       if(( x<p.x() && p.x()<w) && ( y<p.y() && p.y()<h))// The coordinates of the control relative to the application 
        {
            return true;
        }
       
        // Do what you want here 
        return true;

    }
    return QWidget::eventFilter(obj,event);

The above function can also have a layer , Select the corresponding control you want to install this event filter

such as ：

    // Events to be filtered 
    if(obj == ui->lineEdit)// The object of monitoring 
    {
        if (event->type() == QEvent::MouseMove)
        {
            ……
            return true;

        }       
    }
     return QWidget::eventFilter(obj,event);
    

Mode two ： Rewrite mouse events

void mouseMoveEvent(QMouseEvent *ev);

If the control has a father , Remember to also set up mouse tracking  

    // Set the default tracking mouse , Otherwise, when the mouse movement is triggered , You must click it first to be effective 
    this->setMouseTracking(true);

void MyLabel::mouseMoveEvent(QMouseEvent *ev)
{
        // Mouse position 
        int i=ev->x();
        int j=ev->y();
}

The above two methods can dynamically monitor whether the mouse is on a control

Mode three ： static state

if(!ui->lineEdit->geometry().contains(this->mapFromGlobal(QCursor::pos())));

Mode 4 ： static state ：

if(ui->lineEdit->underMouse)