/*
******************************************************************************** 
  *Copyright(C),coolae.net 
  *Author:  wangkaiyuan
  *Version:  2.0 
  *Date:  2017-01-09
  *Description:   tween spriteFill 
  *Others:  
  *History:
*********************************************************************************
*/ 

using UnityEngine;
using System.Collections;

namespace Coolape
{
	[AddComponentMenu ("NGUI/Tween/Tween Sprite Fill")]

	public class TweenSpriteFill : UITweener
	{

		[Range (0f, 1f)]
		public float from;
		[Range (0f, 1f)]
		public float to;


		UISprite mSprite;

		public float value {
			get {
				return mSprite.fillAmount;
			}
			set {
				mSprite.fillAmount = value;
			}
		}

		void Awake ()
		{
			mSprite = GetComponent<UISprite> ();
		}

		protected override void OnUpdate (float factor, bool isFinished)
		{
			value = from * (1f - factor) + to * factor;
		}

		static public TweenSpriteFill Begin (GameObject go, float duration, float amount)
		{
			TweenSpriteFill comp = UITweener.Begin<TweenSpriteFill> (go, duration);
			comp.from = comp.value;
			comp.to = amount;
		
			if (duration <= 0f) {
				comp.Sample (1f, true);
				comp.enabled = false;
			}
			return comp;
		}

		[ContextMenu ("Set 'From' to current value")]
		public override void SetStartToCurrentValue ()
		{
			from = value;
		}

		[ContextMenu ("Set 'To' to current value")]
		public override void SetEndToCurrentValue ()
		{
			to = value;
		}

		[ContextMenu ("Assume value of 'From'")]
		void SetCurrentValueToStart ()
		{
			value = from;
		}

		[ContextMenu ("Assume value of 'To'")]
		void SetCurrentValueToEnd ()
		{
			value = to;
		}
	}
}