比如说
- C/C++ code
void A::paintEvent(QPaintEvent *) { QPainter p(this); ...}这玩意怎么调用的？
------解决方案--------------------
当你使用update()或者repaint()函数时会自动调用，另assistant 助手你不用吗？：
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.