LongPressButton.cs

namespace UnityEngine.UI
{
	using UnityEngine;
	using UnityEngine.UI;
	using UnityEngine.Events;
	using UnityEngine.EventSystems;
	using System.Collections;
	using System;

	public class LongPressButton : Selectable, IUpdateSelectedHandler, IPointerClickHandler
	{
		public float pressTime = 1.0f;
		public bool oneShot = true;
		public bool disableClickEventOnLongPressed = true;
		public UnityEvent onClick;
		public UnityEvent onLongPress;

		private float m_BeganTime;
		private bool m_IsPress;
		private bool m_Ready = true;

		public bool isPress {
			get {
				return m_IsPress;
			}
		}

		public override void OnPointerDown (PointerEventData eventData)
		{
			base.OnPointerDown (eventData);
			m_BeganTime = Time.realtimeSinceStartup;
			m_Ready = true;
			m_IsPress = true;
		}

		public override void OnPointerUp (PointerEventData eventData)
		{
			base.OnPointerUp (eventData);

			m_Ready = false;
			m_IsPress = false;
		}

		public void OnUpdateSelected (BaseEventData eventData)
		{
			if (m_Ready && onLongPress != null && (Time.realtimeSinceStartup - m_BeganTime >= pressTime)) {
				onLongPress.Invoke ();
				m_Ready = !oneShot;
			}
		}

		public void OnPointerClick (PointerEventData eventData)
		{
			if (onClick != null && (!disableClickEventOnLongPressed || Time.realtimeSinceStartup - m_BeganTime < pressTime)) {
				onClick.Invoke ();
			}
		}
	}
}