| source | 指示触发此事件的输入媒体。 |
| tapCount | 点击次数（1 表示单击，2 表示双击）。 |
| headRay | 此事件交互开始时来自用户的射线（具有标准化方向）。 |
指示点击事件的回调。
用户应向 TappedEvent 注册。 如果仅设置了 GestureSettings.Tap 或 GestureSettings.DoubleTap 中的一个，则 tapCount 将分别报告为 1 或 2。如果同时设置了 GestureSettings.Tap 和 GestureSettings.DoubleTap，则会连续报告两个 tapCount。例如，如果您在同一个 GestureRecognizer 上启用两种点击方式并点击两次，则会生成两个事件，第一个事件 tapCount = 1，第二个事件 tapCount = 2。
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