可获得焦点的对象的基类。
焦点用于指定将接收键盘事件的元素。
canGrabFocus | 如果元素可以获得焦点,则返回 true。 |
delegatesFocus | 元素是否应将焦点委托给其子项。 |
focusable | 如果元素可以获得焦点,则为 true。 |
focusController | 返回此元素的焦点控制器。 |
tabIndex | 用于对焦点环中可获得焦点的元素排序的整数。必须大于或等于零。 |
HandleEvent | 处理事件,通常是通过执行与事件关联的回调处理事件。 |
HasBubbleUpHandlers | 如果事件传播 BubbleUp 阶段的事件处理程序已附加到此对象,则返回 true。 |
HasTrickleDownHandlers | 如果事件传播 TrickleDown 阶段的事件处理程序已附加到此对象,则返回 true。 |
RegisterCallback | 向实例添加事件处理程序。如果已为同一阶段(TrickleDown 或 BubbleUp)注册了事件处理程序,则此方法没有效果。 |
SendEvent | 将事件发送到事件处理程序。 |
UnregisterCallback | 从此实例删除回调。 |
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