Called when the window background needs erasing.

当需要擦除窗口的背景时调用这个函数。

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For example, in the window of luxury brand Montblanc, a red Chinese monkey can be seen at the window background with customized monkey Year pens.

例如，奢侈品牌万宝龙的橱窗背景里是一只红色的中国猴，陈列台上摆放着定制的猴年钢笔。

youdao

For example, in the window of luxury brand Montblanc, a red Chinese monkey can be seen at the window background with customized monkey Year pens.

例如，奢侈品牌万宝龙的橱窗背景里是一只红色的中国猴，陈列台上摆放着定制的猴年钢笔。

youdao