Render QGraphicsItem on QPixmap: aggregate 'QWidget w' has incomplete type and cannot be def

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Render QGraphicsItem on QPixmap: aggregate ‘QWidget w‘ has incomplete type and cannot be defined

 

#include <QWidget> and #include <QStyleOptionGraphicsItem> should fix the compile error you are getting.

 

常见错误： 头文件未包含

 

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