Keyboard.PreviewGotKeyboardFocus 附加事件

定义

当元素处于获取键盘焦点的过程中时发生。Occurs when an element is in the process of acquiring keyboard focus.

see AddPreviewGotKeyboardFocusHandler, and RemovePreviewGotKeyboardFocusHandler
see AddPreviewGotKeyboardFocusHandler, and RemovePreviewGotKeyboardFocusHandler
see AddPreviewGotKeyboardFocusHandler, and RemovePreviewGotKeyboardFocusHandler

注解

这是一个附加事件。This is an attached event. WPFWPF将附加事件作为路由事件实现。implements attached events as routed events. 附加事件本质上是XAMLXAML一种用于引用事件的语言概念, 这些事件可在未定义该事件的对象WPFWPF上进行处理, 后者通过同时启用事件来遍历路由。Attached events are fundamentally a XAMLXAML language concept for referencing events that can be handled on objects that do not define that event, which WPFWPF expands upon by also enabling the event to traverse a route. 附加事件在代码中没有直接处理语法;若要在代码中附加路由事件的处理程序, 请使用指定的 Add * 处理程序方法。Attached events do not have a direct handling syntax in code; to attach handlers for a routed event in code, you use a designated Add*Handler method. 有关详细信息, 请参阅附加事件概述For details, see Attached Events Overview.

如果处理PreviewGotKeyboardFocus了事件PreviewLostKeyboardFocus或事件, 键盘焦点不会更改。If the PreviewGotKeyboardFocus event or the PreviewLostKeyboardFocus event is handled, keyboard focus does not change.

键盘焦点指的是接收键盘输入的对象。Keyboard focus refers to the object that is receiving keyboard input. 具有键盘焦点的元素已IsKeyboardFocused设置为trueThe element with keyboard focus has IsKeyboardFocused set to true. 整个桌面上只能有一个具有键盘焦点的元素。There can be only one element with keyboard focus on the entire desktop. 逻辑焦点指焦点范围内的对象。Logical focus refers to the object within a focus scope that has focus. 有关焦点、键盘焦点和逻辑焦点的详细信息, 请参阅输入概述焦点概述For more information on focus, keyboard focus, and logical focus, see Input Overview and Focus Overview.

路由事件信息Routed Event Information

标识符字段Identifier field PreviewGotKeyboardFocusEvent
路由策略Routing strategy 建立Tunneling
委托Delegate KeyboardFocusChangedEventHandler

适用于