单击ListWidget的项目第一次引发错误？

Question

我想问你一个问题。当我第一次点击listwidget的项目时，我看到应用程序输出中有一些文本行：

QPainter::begin: Paint device returned engine == 0, type: 3
QPainter::setWorldTransform: Painter not active
QPainter::worldTransform: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::setBrush: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setClipping: Painter not active, state will be reset by begin

这是一个错误吗？如何在app输出中隐藏/禁用这些文本行？

Answer 1

这些是QT的警告信息。

您可能在图片原因 type == 3

时遇到问题

请查看device types。