void QWidget::mousePressEvent(QMouseEvent *event)

{

    QString str="("+QString::number(event->x())+","+QString::number(event->y())+")";

  //  ui->lineEdit->setText(tr("鼠标按下")+str);

    if(event->button()==Qt::LeftButton)

    {

        ui->lineEdit->setText(tr("鼠标左键按下:")+str);

    }

    else if(event->button()==Qt::RightButton)

    {

         ui->lineEdit->setText(tr("鼠标右键按下:")+str);

    }

    else if(event->button()==Qt::MidButton)

    {

         ui->lineEdit->setText(tr("鼠标中键按下:")+str);

    }

}

//鼠标移动事件

void QWidget::mouseMoveEvent(QMouseEvent *event)

{

    QString str="("+QString::number(event->x())+","+QString::number(event->y())+")";

   // ui->lineEdit->setText(tr("鼠标移动")+str);

    if(event->buttons()&Qt::LeftButton)

        ui->lineEdit->setText(tr("鼠标左键按下移动")+str);//不明白为什么会有判断移动的因素，看英文文档也没有看出端倪，呵呵，只有积累顺便记住了

    else if(event->buttons()&Qt::RightButton)

        ui->lineEdit->setText(tr("鼠标右键按下移动")+str);

    else if(event->buttons()&Qt::MidButton)

        ui->lineEdit->setText(tr("鼠标中键按下移动")+str);

}

//鼠标释放事件

void QWidget::mouseReleaseEvent(QMouseEvent *event)

{

    QString str="("+QString::number(event->x())+","+QString::number(event->y())+")";

  //  ui->lineEdit->setText(tr("鼠标释放")+str);

    if(event->button()==Qt::LeftButton)

    {

        ui->lineEdit->setText(tr("鼠标左键释放:")+str);

    }

    else if(event->button()==Qt::RightButton)

    {

         ui->lineEdit->setText(tr("鼠标右键释放:")+str);

    }

    else if(event->button()==Qt::MidButton)

    {

         ui->lineEdit->setText(tr("鼠标中键释放:")+str);

    }

}