ObservableButtonDownTrigger.cs

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

public class ObservableButtonDownTrigger : ObservableTriggerBase, IPointerDownHandler, IPointerUpHandler{
    public bool IsPointerDown { private set; get; }
    private Subject<bool> onButtonDown;
    private int repeatStartFrame = 50;
    private int repeatSpanFrame = 5;
    private bool isOldPointerDown;
    private int holdCount = 0;
    private int repeatTargetFrame;

	public IObservable<bool> OnButtonDown(int repeatStartFrame = 50,int repeatSpanFrame = 10)
	{
	    this.repeatStartFrame = repeatStartFrame;
	    this.repeatSpanFrame = repeatSpanFrame;
		return onButtonDown ?? (onButtonDown = new Subject<bool>());
	}

	private void Update() {
	    if (onButtonDown != null)
	    {
	        if (IsPointerDown)
	        {
	            if (isOldPointerDown == false)
	            {
	                onButtonDown.OnNext(true); //PUSH
	                holdCount = 0;
	                repeatTargetFrame = repeatStartFrame;
	            }
	            else
	            {
	                holdCount++;
	                if (holdCount >= repeatTargetFrame)
	                {
	                    onButtonDown.OnNext(true); //HOLD
	                    holdCount = 0;
	                    repeatTargetFrame = repeatSpanFrame;
	                }
	                else
	                {
	                    onButtonDown.OnNext(false); 
	                }
	            }
	        }
	        else
	        {
	            onButtonDown.OnNext(false);
	        }
	    }
        isOldPointerDown = IsPointerDown;
    }

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

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

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