依据来源：https://doc.qt.io/qt-5/qml-qtquick-mouseevent.html

具体是在event事件或者mouse系列事件中捕获到鼠标事件后，用如下代码判断鼠标事件是否由触摸事件转换而来的

    if(mouseEvent->source()==Qt::MouseEventSynthesizedBySystem){qDebug()<<"是由触摸事件转换而来的";}

通过该条件的一律返回，剩下的就是不由触摸事件生成的鼠标事件，由此做到鼠标与触摸事件的分离，使得触摸事件引起的鼠标事件不再干扰判断
更多信息从依据来源中抽取出来后如下，翻译由网易翻译完成。

此属性保存鼠标事件的源。

鼠标事件源可用于区分真正的鼠标事件和人工鼠标事件。当使用其他指向设备(如触摸屏和图形平板)时，如果应用程序没有使用实际的触摸或平板事件，则鼠标事件可能由操作系统或Qt本身合成。

取值可以是:
Qt.MouseEventNotSynthesized -最常见的值。在这些信息可用的平台上，该值表示该事件代表来自系统的真正鼠标事件。
Qt.MouseEventSynthesizedBySystem -指示鼠标事件是由平台从触摸或平板事件合成的。

Qt.MouseEventSynthesizedByQt -指示鼠标事件是由Qt从未处理的触摸或平板事件合成的。

Qt.MouseEventSynthesizedByApplication-指示鼠标事件是由应用程序合成的。这允许将应用程序生成的鼠标事件与来自系统或由Qt合成的鼠标事件区分开来。

这个属性是在Qt 5.7中引入的。

This property holds the source of the mouse event.

The mouse event source can be used to distinguish between genuine and
artificial mouse events. When using other pointing devices such as
touchscreens and graphics tablets, if the application does not make
use of the actual touch or tablet events, mouse events may be
synthesized by the operating system or by Qt itself.

The value can be one of:

Qt.MouseEventNotSynthesized - The most common value. On platforms
where such information is available, this value indicates that the
event represents a genuine mouse event from the system.
Qt.MouseEventSynthesizedBySystem - Indicates that the mouse event was
synthesized from a touch or tablet event by the platform.
Qt.MouseEventSynthesizedByQt - Indicates that the mouse event was
synthesized from an unhandled touch or tablet event by Qt.
Qt.MouseEventSynthesizedByApplication - Indicates that the mouse event
was synthesized by the application. This allows distinguishing
application-generated mouse events from the ones that are coming from
the system or are synthesized by Qt.

This property was introduced in Qt 5.7.