Keyboard.PreviewGotKeyboardFocus Keyboard.PreviewGotKeyboardFocus Keyboard.PreviewGotKeyboardFocus Attached Event

定義

當項目正在取得鍵盤焦點時發生。Occurs when an element is in the process of acquiring keyboard focus.

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

備註

這是附加事件。This is an attached event. WPFWPF將附加事件實作為路由事件。implements attached events as routed events. 附加事件基本上是參考XAMLXAML事件的一種語言概念, 可以在未定義該事件的物件上處理, 這WPFWPF也會讓事件通過路由來進行擴充。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. 附加事件在程式碼中沒有直接處理語法;若要在程式碼中附加路由事件的處理常式, 您可以使用指定的 Add * 處理常式方法。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. 如需詳細資訊, 請參閱附加事件總覽For details, see Attached Events Overview.

PreviewGotKeyboardFocus如果事件PreviewLostKeyboardFocus或事件已處理, 則不會變更鍵盤焦點。If the PreviewGotKeyboardFocus event or the PreviewLostKeyboardFocus event is handled, keyboard focus does not change.

鍵盤焦點是指接收鍵盤輸入的物件。Keyboard focus refers to the object that is receiving keyboard input. 具有鍵盤焦點的元素已IsKeyboardFocused設定為trueThe element with keyboard focus has IsKeyboardFocused set to true. 在整個桌面上只能有一個具有鍵盤焦點的元素。There can be only one element with keyboard focus on the entire desktop. 邏輯焦點是指焦點範圍內具有焦點的物件。Logical focus refers to the object within a focus scope that has focus. 如需有關焦點、鍵盤焦點和邏輯焦點的詳細資訊, 請參閱輸入總覽焦點總覽For more information on focus, keyboard focus, and logical focus, see Input Overview and Focus Overview.

路由事件資訊Routed Event Information

識別碼欄位Identifier field PreviewGotKeyboardFocusEvent
路由策略Routing strategy 建立Tunneling
Delegate - 委派Delegate KeyboardFocusChangedEventHandler

適用於