想在QT程序中使用鼠标事件，添加重载的响应函数，并实现后，一直提示 member access into incomplete type 'QMouseEvent'
既然使用了QMouseEvent类，就应该将其头文件包含进去，在.h中加入： #include <QMouseEvent> 问题解决！
以后遇到类似的记得包含其对应的头文件！
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