基类,用于定义焦点在焦点环中的移动方向。
焦点环实现可以在不同方向移动焦点;可以从此类派生实现各种方法来将焦点从一个元素更改为另一个元素。
lastValue | 此类定义的上一个方向值。 |
none | null 方向。当焦点保持在同一元素上时,通常使用此值。 |
unspecified | 焦点来自未指定的方向,例如按下鼠标后。 |
int | 此方向的底层整数值。 |
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