UIElement.TouchDown 事件
定義
手指在這個項目上方且在螢幕上觸控時發生。Occurs when a finger touches the screen while the finger is over this element.
public:
event EventHandler<System::Windows::Input::TouchEventArgs ^> ^ TouchDown;public event EventHandler<System.Windows.Input.TouchEventArgs> TouchDown;member this.TouchDown : EventHandler<System.Windows.Input.TouchEventArgs> Public Custom Event TouchDown As EventHandler(Of TouchEventArgs) 事件類型
備註
依預設，在 PreviewTouchDown TouchDown 手指觸及畫面並移動之前，並不會發生和事件。By default, the PreviewTouchDown and TouchDown events do not occur until a finger touches the screen and moves. 在螢幕上按手指並按住以不移動，會導致的保存行為 Stylus 。Pressing a finger on the screen and holding it without moving it causes the press and hold behavior of a Stylus. 按住不放行為相當於滑鼠右鍵按一下。The press and hold behavior is equivalent to a mouse right-click.
若要使 PreviewTouchDown 和 TouchDown 事件在手指觸控式螢幕幕時立刻發生，請將此專案的 Stylus.IsPressAndHoldEnabled 附加屬性設為 false 。To cause the PreviewTouchDown and TouchDown events to occur as soon as a finger touches the screen, set the Stylus.IsPressAndHoldEnabled attached property to false for this element.
路由事件資訊Routed Event Information
| 識別碼欄位Identifier field | TouchDownEvent |
| 路由策略Routing strategy | 鼓 泡Bubbling |
| 代理人Delegate | 型別 EventHandler<TEventArgs> 的 TouchEventArgs。EventHandler<TEventArgs> of type TouchEventArgs. |
對應的通道事件為 PreviewTouchDown 。The corresponding tunneling event is PreviewTouchDown.
OnTouchDown在衍生類別中覆寫以執行這個事件的類別處理。Override OnTouchDown to implement class handling for this event in derived classes.