保存指针 ID 值的静态类。
这些值用作 IPointerEvent.pointerId 的值。
| invalidPointerId | 表示无效的指针 ID 值。 |
| maxPointers | 实现支持的最大指针数。 |
| mousePointerId | 鼠标指针 ID。 |
| penPointerCount | 实现支持的笔指针的数量。 |
| penPointerIdBase | 笔指针的基本 ID。 |
| touchPointerCount | 实现支持的触摸指针的数量。 |
| touchPointerIdBase | 触摸指针的基本 ID。 |
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