目录1.问题现象2.问题原因3.修改方案1.问题现象 自定义 QGraphicsItem 时，绘制rect，对象移动时出现残影。
is it possible to distribute 开发者_Python百科an App via the App Store for free, in which You can only log in if you are using an extern charged ServiceI would say yes if I understand your question co
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