下皆來自qt官方文檔：

void?QWidget::paintEvent(QPaintEvent?*event)

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.（好評在此粗！）

總結

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