using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using System.Collections;

namespace UIWidgets
{
	/// <summary>
	/// SlideBlock handle.
	/// </summary>
	public class SlideBlockHandle : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler {
		/// <summary>
		/// BeginDrag event.
		/// </summary>
		public PointerUnityEvent BeginDragEvent = new PointerUnityEvent();

		/// <summary>
		/// EndDrag event.
		/// </summary>
		public PointerUnityEvent EndDragEvent = new PointerUnityEvent();

		/// <summary>
		/// Drag event.
		/// </summary>
		public PointerUnityEvent DragEvent = new PointerUnityEvent();

		/// <summary>
		/// Called by a BaseInputModule before a drag is started.
		/// </summary>
		/// <param name="eventData">Event data.</param>
		public void OnBeginDrag(PointerEventData eventData)
		{
			BeginDragEvent.Invoke(eventData);
		}
		
		/// <summary>
		/// Called by a BaseInputModule when a drag is ended.
		/// </summary>
		/// <param name="eventData">Event data.</param>
		public void OnEndDrag(PointerEventData eventData)
		{
			EndDragEvent.Invoke(eventData);
		}
		
		/// <summary>
		/// When draging is occuring this will be called every time the cursor is moved.
		/// </summary>
		/// <param name="eventData">Event data.</param>
		public void OnDrag(PointerEventData eventData)
		{
			DragEvent.Invoke(eventData);
		}
	}
}