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

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+//----------------------------------------------
+//            NGUI: Next-Gen UI kit
+// Copyright © 2011-2015 Tasharen Entertainment
+//----------------------------------------------
+
+using UnityEngine;
+
+/// <summary>
+/// Tween the object's alpha. Works with both UI widgets as well as renderers.
+/// </summary>
+
+[AddComponentMenu("NGUI/Tween/Tween Alpha")]
+public class TweenAlpha : UITweener
+{
+	[Range(0f, 1f)] public float from = 1f;
+	[Range(0f, 1f)] public float to = 1f;
+
+	bool mCached = false;
+	UIRect mRect;
+	Material mMat;
+	SpriteRenderer mSr;
+
+	[System.Obsolete("Use 'value' instead")]
+	public float alpha { get { return this.value; } set { this.value = value; } }
+
+	void Cache ()
+	{
+		mCached = true;
+		mRect = GetComponent<UIRect>();
+		mSr = GetComponent<SpriteRenderer>();
+
+		if (mRect == null && mSr == null)
+		{
+			Renderer ren = GetComponent<Renderer>();
+			if (ren != null) mMat = ren.sharedMaterial;
+			if (mMat == null) mRect = GetComponentInChildren<UIRect>();
+		}
+	}
+
+	/// <summary>
+	/// Tween's current value.
+	/// </summary>
+
+	public float value
+	{
+		get
+		{
+			if (!mCached) Cache();
+			if (mRect != null) return mRect.alpha;
+			if (mSr != null) return mSr.color.a;
+			return mMat != null ? mMat.color.a : 1f;
+		}
+		set
+		{
+			if (!mCached) Cache();
+
+			if (mRect != null)
+			{
+				mRect.alpha = value;
+			}
+			else if (mSr != null)
+			{
+				Color c = mSr.color;
+				c.a = value;
+				mSr.color = c;
+			}
+			else if (mMat != null)
+			{
+				Color c = mMat.color;
+				c.a = value;
+				mMat.color = c;
+			}
+		}
+	}
+
+	/// <summary>
+	/// Tween the value.
+	/// </summary>
+
+	protected override void OnUpdate (float factor, bool isFinished) { value = Mathf.Lerp(from, to, factor); }
+
+	/// <summary>
+	/// Start the tweening operation.
+	/// </summary>
+
+	static public TweenAlpha Begin (GameObject go, float duration, float alpha)
+	{
+		TweenAlpha comp = UITweener.Begin<TweenAlpha>(go, duration);
+		comp.from = comp.value;
+		comp.to = alpha;
+
+		if (duration <= 0f)
+		{
+			comp.Sample(1f, true);
+			comp.enabled = false;
+		}
+		return comp;
+	}
+
+	public override void SetStartToCurrentValue () { from = value; }
+	public override void SetEndToCurrentValue () { to = value; }
+}