using System;
using UnityEngine;

[RequireComponent(typeof(AudioSource))]
[AddComponentMenu("NGUI/Tween/Tween Volume")]
public class TweenVolume : UITweener
{
	public AudioSource audioSource
	{
		get
		{
			if (this.mSource == null)
			{
				this.mSource = base.GetComponent<AudioSource>();
				if (this.mSource == null)
				{
					this.mSource = base.GetComponent<AudioSource>();
					if (this.mSource == null)
					{
						Debug.LogError("TweenVolume needs an AudioSource to work with", this);
						base.enabled = false;
					}
				}
			}
			return this.mSource;
		}
	}

	[Obsolete("Use 'value' instead")]
	public float volume
	{
		get
		{
			return this.value;
		}
		set
		{
			this.value = value;
		}
	}

	public float value
	{
		get
		{
			return (!(this.audioSource != null)) ? 0f : this.mSource.volume;
		}
		set
		{
			if (this.audioSource != null)
			{
				this.mSource.volume = value;
			}
		}
	}

	protected override void OnUpdate(float factor, bool isFinished)
	{
		this.value = this.from * (1f - factor) + this.to * factor;
		this.mSource.enabled = (this.mSource.volume > 0.01f);
	}

	public static TweenVolume Begin(GameObject go, float duration, float targetVolume)
	{
		TweenVolume tweenVolume = UITweener.Begin<TweenVolume>(go, duration);
		tweenVolume.from = tweenVolume.value;
		tweenVolume.to = targetVolume;
		return tweenVolume;
	}

	public override void SetStartToCurrentValue()
	{
		this.from = this.value;
	}

	public override void SetEndToCurrentValue()
	{
		this.to = this.value;
	}

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

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

	private AudioSource mSource;
}