Define the class delegate of the ListElement view.

定义ListElement视图的delegate类。

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This object is the element selected by the user in the ListElement view.

此对象是由 ListElement 视图中的用户选择的元素。

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The ListElement view is composed by only one view component, a Table View component.

ListElement 视图由惟一的视图组件（Table View 组件）组成。

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