我将Graphicview类控件升级为了Gwraphicview,并在Gwraphicview里面重新定义了mouseEvent,和paintEvent当鼠标点下时开始画框,当鼠标释放时画框结束,但是为什么提示QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1,画框也不显示?
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QT的Graphicview里怎么使用鼠标画图?
我将Graphicview类控件升级为了Gwraphicview,并在Gwraphicview里面重新定义了mouseEvent,和paintEvent当鼠标点下时开始画框,当鼠标释放时画框结束,但是为什么提示QWidget::paintEngine: Should no longer be called QPainter::begin: Paint device returned engine == 0, type: 1,画框也不显示?