Floating window background color setting.

取词窗口背景色设置。

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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。

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For example, a floating windows user could monitor a stock ticker in a background window while working on a report in the foreground.

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Rather than close or minimize a phone window to interact with a background application like a music player, users could control a primary application, like email, via touchscreen or keys, and manage the background application via gestures, said Goren.

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Just above the dial center is a small rectangular window, about the same shade as the background, which turns gradually red as evening falls.

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