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

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+//----------------------------------------------
+//            NGUI: Next-Gen UI kit
+// Copyright © 2011-2015 Tasharen Entertainment
+//----------------------------------------------
+
+using UnityEngine;
+using System.Collections.Generic;
+
+/// <summary>
+/// Spring-like motion -- the farther away the object is from the target, the stronger the pull.
+/// </summary>
+
+[AddComponentMenu("NGUI/Tween/Spring Position")]
+public class SpringPosition : MonoBehaviour
+{
+	static public SpringPosition current;
+
+	/// <summary>
+	/// Target position to tween to.
+	/// </summary>
+
+	public Vector3 target = Vector3.zero;
+
+	/// <summary>
+	/// Strength of the spring. The higher the value, the faster the movement.
+	/// </summary>
+
+	public float strength = 10f;
+
+	/// <summary>
+	/// Is the calculation done in world space or local space?
+	/// </summary>
+
+	public bool worldSpace = false;
+
+	/// <summary>
+	/// Whether the time scale will be ignored. Generally UI components should set it to 'true'.
+	/// </summary>
+
+	public bool ignoreTimeScale = false;
+
+	/// <summary>
+	/// Whether the parent scroll view will be updated as the object moves.
+	/// </summary>
+
+	public bool updateScrollView = false;
+
+	public delegate void OnFinished ();
+
+	/// <summary>
+	/// Delegate to trigger when the spring finishes.
+	/// </summary>
+
+	public OnFinished onFinished;
+
+	// Deprecated functionality
+	[SerializeField][HideInInspector] GameObject eventReceiver = null;
+	[SerializeField][HideInInspector] public string callWhenFinished;
+
+	Transform mTrans;
+	float mThreshold = 0f;
+	UIScrollView mSv;
+
+	/// <summary>
+	/// Cache the transform.
+	/// </summary>
+
+	void Start ()
+	{
+		mTrans = transform;
+		if (updateScrollView) mSv = NGUITools.FindInParents<UIScrollView>(gameObject);
+	}
+
+	/// <summary>
+	/// Advance toward the target position.
+	/// </summary>
+
+	void Update ()
+	{
+		float delta = ignoreTimeScale ? RealTime.deltaTime : Time.deltaTime;
+
+		if (worldSpace)
+		{
+			if (mThreshold == 0f) mThreshold = (target - mTrans.position).sqrMagnitude * 0.001f;
+			mTrans.position = NGUIMath.SpringLerp(mTrans.position, target, strength, delta);
+
+			if (mThreshold >= (target - mTrans.position).sqrMagnitude)
+			{
+				mTrans.position = target;
+				NotifyListeners();
+				enabled = false;
+			}
+		}
+		else
+		{
+			if (mThreshold == 0f) mThreshold = (target - mTrans.localPosition).sqrMagnitude * 0.00001f;
+			mTrans.localPosition = NGUIMath.SpringLerp(mTrans.localPosition, target, strength, delta);
+
+			if (mThreshold >= (target - mTrans.localPosition).sqrMagnitude)
+			{
+				mTrans.localPosition = target;
+				NotifyListeners();
+				enabled = false;
+			}
+		}
+
+		// Ensure that the scroll bars remain in sync
+		if (mSv != null) mSv.UpdateScrollbars(true);
+	}
+
+	/// <summary>
+	/// Notify all finished event listeners.
+	/// </summary>
+
+	void NotifyListeners ()
+	{
+		current = this;
+
+		if (onFinished != null) onFinished();
+
+		if (eventReceiver != null && !string.IsNullOrEmpty(callWhenFinished))
+			eventReceiver.SendMessage(callWhenFinished, this, SendMessageOptions.DontRequireReceiver);
+
+		current = null;
+	}
+
+	/// <summary>
+	/// Start the tweening process.
+	/// </summary>
+
+	static public SpringPosition Begin (GameObject go, Vector3 pos, float strength)
+	{
+		SpringPosition sp = go.GetComponent<SpringPosition>();
+		if (sp == null) sp = go.AddComponent<SpringPosition>();
+		sp.target = pos;
+		sp.strength = strength;
+		sp.onFinished = null;
+
+		if (!sp.enabled)
+		{
+			sp.mThreshold = 0f;
+			sp.enabled = true;
+		}
+		return sp;
+	}
+}