QPaintEvent in Qt: A Guide to Paint Events and Redrawing

QPaintEvent is a class in the Qt library that represents a paint event. A paint event occurs when a widget needs to be redrawn. The QPaintEvent class provides information about the area of the widget that needs to be redrawn, as well as the painter object that can be used to draw on the widget.

'QPaintEvent*' is a pointer to a QPaintEvent object. It is often used as a parameter in event handler functions that handle paint events, such as QWidget::paintEvent(QPaintEvent*). By passing a pointer to a QPaintEvent object to these functions, the programmer can access the information about the area of the widget that needs to be redrawn and use the provided painter object to perform custom painting.