Add Confirm and cancel handling to a Unity UI element

OnConfirmCancel

using System;
using System.Collections.Generic;

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

	[Serializable]
	public class ConfirmCancelEntry
	{
		public ConfirmCancelTriggerType eventID = ConfirmCancelTriggerType.Submit;
		public EventTrigger.TriggerEvent callback = new EventTrigger.TriggerEvent ();
	}

	public enum ConfirmCancelTriggerType
	{
		Submit,
		Cancel
	}

	public class OnConfirmCancel : MonoBehaviour, ISubmitHandler, ICancelHandler
	{
		public EventSystem System;
		public List<ConfirmCancelEntry> delegates;

		public void OnSubmit(BaseEventData data)
		{
			this.Execute (ConfirmCancelTriggerType.Submit, data);
		}

		public void OnCancel (BaseEventData data)
		{
			this.Execute (ConfirmCancelTriggerType.Cancel, data);
		}

		private void Execute (ConfirmCancelTriggerType id, BaseEventData eventData)
		{
			if (this.delegates != null)
			{
				int i = 0;
				int count = this.delegates.Count;
				while (i < count)
				{
					ConfirmCancelEntry entry = this.delegates [i];
					if (entry.eventID == id && entry.callback != null)
					{
						entry.callback.Invoke (eventData);
					}
					i++;
				}
			}
		}
	}