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Assets/CoolapeFrame/3rd/NGUI_Enhance/Scripts/Tweening/TweenVolume.cs

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+//----------------------------------------------
+//            NGUI: Next-Gen UI kit
+// Copyright © 2011-2015 Tasharen Entertainment
+//----------------------------------------------
+
+using UnityEngine;
+
+/// <summary>
+/// Tween the audio source's volume.
+/// </summary>
+
+[RequireComponent(typeof(AudioSource))]
+[AddComponentMenu("NGUI/Tween/Tween Volume")]
+public class TweenVolume : UITweener
+{
+#if UNITY_3_5
+	public float from = 1f;
+	public float to = 1f;
+#else
+	[Range(0f, 1f)] public float from = 1f;
+	[Range(0f, 1f)] public float to = 1f;
+#endif
+
+	AudioSource mSource;
+
+	/// <summary>
+	/// Cached version of 'audio', as it's always faster to cache.
+	/// </summary>
+
+	public AudioSource audioSource
+	{
+		get
+		{
+			if (mSource == null)
+			{
+				mSource = GetComponent<AudioSource>();
+				
+				if (mSource == null)
+				{
+					mSource = GetComponent<AudioSource>();
+
+					if (mSource == null)
+					{
+						Debug.LogError("TweenVolume needs an AudioSource to work with", this);
+						enabled = false;
+					}
+				}
+			}
+			return mSource;
+		}
+	}
+
+	[System.Obsolete("Use 'value' instead")]
+	public float volume { get { return this.value; } set { this.value = value; } }
+
+	/// <summary>
+	/// Audio source's current volume.
+	/// </summary>
+
+	public float value
+	{
+		get
+		{
+			return audioSource != null ? mSource.volume : 0f;
+		}
+		set
+		{
+			if (audioSource != null) mSource.volume = value;
+		}
+	}
+
+	protected override void OnUpdate (float factor, bool isFinished)
+	{
+		value = from * (1f - factor) + to * factor;
+		mSource.enabled = (mSource.volume > 0.01f);
+	}
+
+	/// <summary>
+	/// Start the tweening operation.
+	/// </summary>
+
+	static public TweenVolume Begin (GameObject go, float duration, float targetVolume)
+	{
+		TweenVolume comp = UITweener.Begin<TweenVolume>(go, duration);
+		comp.from = comp.value;
+		comp.to = targetVolume;
+		return comp;
+	}
+
+	public override void SetStartToCurrentValue () { from = value; }
+	public override void SetEndToCurrentValue () { to = value; }
+}