Qlable问题

用QT4.5做界面，怎样用Qlable自适应显示图片啊，有做过的帮帮忙，给个完整的代码。

最好的帮助就是QT的帮助文档：
scaledContents : bool

This property holds whether the label will scale its contents to fill all available space.

When enabled and the label shows a pixmap, it will scale the pixmap to fill the available space.

This property's default is false.

Access functions:

bool hasScaledContents () const
void setScaledContents ( bool )