If you have an immutable object, you must set whatever state it will contain in the constructor.

如果您有一个不可变对象，则必须要在构造函数中设置该对象将包含的任何状态。

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Only the parent and style are set in the constructor; all other properties are set on the created object.

只有父控件和样式是在构造函数中设置的，其他所有属性都是在已创建的对象上设置的。

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This parameter is passed on the object constructor to mandate that it is set.

此参数在对象构造函数上传递，以强制设置该参数。

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