uGUIが押されている間はtrue,離されている間はfalseをStreamに流し続けるTrigger

ObservableButtonDownTrigger.cs

using UniRx;
using UniRx.Triggers;
using UnityEngine.EventSystems;

public class ObservableButtonDownTrigger : ObservableTriggerBase, IPointerDownHandler, IPointerUpHandler{
	private bool isPointerDown;
	private Subject<bool> onButtonDown;

	public IObservable<bool> OnButtonDown
	{
		get { return onButtonDown ?? (onButtonDown = new Subject<bool>()); }
	}

	private void Update() {
		if (onButtonDown != null) onButtonDown.OnNext(isPointerDown);
	}

	public void OnPointerDown(PointerEventData eventData){
		isPointerDown = true;
	}

	public void OnPointerUp(PointerEventData eventData){
		isPointerDown = false;
	}

	protected override void RaiseOnCompletedOnDestroy(){
		if (onButtonDown != null){
			onButtonDown.OnCompleted();
		}
	}
}