按下的按钮或控制器功能的类型（如果有）。
| Select | 根据交互源的 InteractionSourceType，这可能是一些等效对象：遥控器上的主按钮、通过手隔空敲击以及运动控制器上的触发器。 |
| Menu | 此按钮标有三条水平线，与 Xbox One 控制器上的相同。 |
| Grasp | 这些按钮通常位于控制器的一侧。有些硬件具有多个抓取按钮。 |
| Touchpad | 对于触控板，足够按压才计为已按下 - 否则，仅视为触摸并将通过 InteractionSourceState.touchpadPosition 提供读取的位置。 |
| Thumbstick | 与触控板类似，移动控制杆不计为已按下 - 向下足够按压控制杆时才会出现按下状态 |
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