postMixInProperties: This method is called after all the widget parameters have been set (mixed in) as widget instance properties.

postMixInProperties：这个方法会在所有小部件参数均被设置（混合入）为小部件实例属性后调用。

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After it finds the appropriate value, the code triggers a change event using the widget handlers for the TwoWayForm widget instance.

找到适当的值之后，代码使用TwoWayForm小部件实例的小部件句柄触发一个更改事件。

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The services provided by the iWidget framework can be used by invoking methods on an object named iContext and set automatically in the iScope class of the widget instance.

要使用 iWidget 框架提供的服务，可以调用名为 iContext 的对象上的方法。

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For instance, S-Launcher is a desktop widget that replicates the now-extinct Start Menu, live search and all. eSettings, meanwhile, is a centralized options menu for folks who might not know where to find power management or display settings in Win 8.

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