《QT从基础到进阶·十八》QT中的各种鼠标事件QEvent

bool CustomPopDialog::event(QEvent* event)
{
    switch (event->type())
    {
    case QEvent::MouseButtonRelease:
        //Event of mouse releasing window title
    case QEvent::NonClientAreaMouseButtonRelease:
    {
        QMouseEvent* e = static_cast<QMouseEvent*>(event);
        if (e && e->button() == Qt::LeftButton)
        {
            emit dragRelease(e->globalPos());
        }
        m_isPress = false;
        if (m_timer->isActive() == true)
        {
            m_timer->stop();
        }
    }
    break;
    case QEvent::Close:
    {
        // Signal the pop-up window to destroy
        emit PopDialogClose(m_pWidget);
        m_isPress = false;
        if (m_timer->isActive() == true)
        {
            m_timer->stop();
        }
        break;
    }
    case QEvent::NonClientAreaMouseButtonPress:
    {
        QMouseEvent* e = static_cast<QMouseEvent*>(event);
        if (e && e->button() == Qt::LeftButton)
        {
            m_isPress = true;
            if (m_timer->isActive() == false)
            {
                m_timer->start(10);
            }
        }
        break;
    }
    case QEvent::NonClientAreaMouseMove:
    {
        QMouseEvent* e = static_cast<QMouseEvent*>(event);
        if (m_isPress)
        {
            int a = 0;
        }
        if (e)
        {
            emit mouseGlobalPoint(e->pos());
        }
        break;
    }
    }
    return QDialog::event(event);
}

#include <QMouseEvent>
void widget::mousePressEvent(QMouseEvent* event)
{
  //鼠标左键按下
  if (event->button() == Qt::LeftButton)
  {
    //do something
  }
  //...
}

setMouseTracking(true); //设置鼠标跟踪

void enterEvent(QEvent* event); //鼠标移入界面触发
void leaveEvent(QEvent* event); //鼠标移出界面触发

//demo
void THM_CT::wheelEvent(QWheelEvent * event)
{
   // …
  m_currentIndex += event->delta() / 500.0;
  r_image=image.scaled(image.width()*currentIndex,image.height()*currentIndex,Qt::IgnoreAspectRatio, Qt::SmoothTransformation); //图片缩放  
}