The ID of the ink annotation currently being drawn, or null if idle.
Whether the user is currently in the middle of a drawing stroke.
Duration of the most recent stroke in milliseconds, or null if unavailable.
Timestamp (ms since epoch) when the most recent stroke ended, or null if no stroke has completed.
Timestamp (ms since epoch) when the most recent stroke started, or null if no stroke has occurred.
Represents the current state of an ink drawing operation. Tracks whether the user is actively drawing, which annotation is being drawn, and timing information for the most recent stroke.