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看艾薇的熊猫 发表于 2015-10-20 22:09
能详细说下吗?刚刚开始学习 不太会 好多人都这么说 但是具体不会写
继承QLabel,然后写一个paintEvent函数,这样你就可以在paintEvent里实现划线的代码了。
void QLabel::paintEvent ( QPaintEvent * ) [virtual protected]
Reimplemented from QWidget::paintEvent().
void QWidget::paintEvent ( QPaintEvent * event ) [virtual protected]
This event handler can be reimplemented in a subclass to receive paint events passed in event.
A paint event is a request to repaint all or part of a widget. It can happen for one of the following reasons:
repaint() or update() was invoked,
the widget was obscured and has now been uncovered, or
many other reasons.
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