A controller that manages the player of a timeline.
The entity that the timeline player is playing on.
The controller is valid.
Closes the current controller.
Gets the duration of the timeline.
Gets if the timeline is completed.
Gets if the timeline is paused.
Gets if the timeline is playing.
Gets if the timeline is stopped.
Pauses the timeline.
Plays the timeline.
Resumes the timeline.
Stops the timeline.