Extend any widget with additional data and function members.
用额外的数据和函数成员扩展任一小部件。
Respond to external events by adding function members that follow a specified naming convention.
通过添加遵循特定命名约定的函数成员来响应外部事件。
Respond to external events by adding function members that follow a specified naming convention.
通过添加遵循特定命名约定的函数成员来响应外部事件。
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