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1、模拟鼠标按下事件

        QPoint p = this->rect().center();QMouseEvent *pressEvent = new QMouseEvent(QEvent::MouseButtonPress,p,Qt::LeftButton,Qt::LeftButton,Qt::NoModifier);mousePressEvent(pressEvent);

2、模拟鼠标松开事件

QMouseEvent *releaseEvent = new QMouseEvent(QEvent::MouseButtonRelease,p,Qt::LeftButton,Qt::LeftButton,Qt::NoModifier);
mouseReleaseEvent(releaseEvent);

3、模拟鼠标点击事件

按顺序模拟1、2的事件，代码如下：

mousePressEvent(pressEvent);
mouseReleaseEvent(releaseEvent);

4、模拟鼠标移动事件

QMouseEvent *moveEvent = new QMouseEvent(QEvent::MouseMove,p,Qt::LeftButton,Qt::LeftButton,Qt::NoModifier);
mousePressEvent(pressEvent);
mouseReleaseEvent(releaseEvent);
mouseMoveEvent(moveEvent); //新增移动事件刷新画线和十字线