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Assets/CoolapeFrame/3rd/NGUI_Enhance/Scripts/Internal/SpringPanel.cs

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+//----------------------------------------------
+//            NGUI: Next-Gen UI kit
+// Copyright © 2011-2015 Tasharen Entertainment
+//----------------------------------------------
+
+using UnityEngine;
+
+/// <summary>
+/// Similar to SpringPosition, but also moves the panel's clipping. Works in local coordinates.
+/// </summary>
+
+[RequireComponent(typeof(UIPanel))]
+[AddComponentMenu("NGUI/Internal/Spring Panel")]
+public class SpringPanel : MonoBehaviour
+{
+	static public SpringPanel current;
+
+	/// <summary>
+	/// Target position to spring the panel 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;
+
+	public delegate void OnFinished ();
+
+	/// <summary>
+	/// Delegate function to call when the operation finishes.
+	/// </summary>
+
+	public OnFinished onFinished;
+
+	UIPanel mPanel;
+	Transform mTrans;
+	UIScrollView mDrag;
+
+	/// <summary>
+	/// Cache the transform.
+	/// </summary>
+
+	void Start ()
+	{
+		mPanel = GetComponent<UIPanel>();
+		mDrag = GetComponent<UIScrollView>();
+		mTrans = transform;
+	}
+
+	/// <summary>
+	/// Advance toward the target position.
+	/// </summary>
+
+	void Update ()
+	{
+	    AdvanceTowardsPosition();
+	}
+
+    /// <summary>
+    /// Advance toward the target position.
+	/// </summary>
+
+	protected virtual void AdvanceTowardsPosition ()
+	{
+		float delta = RealTime.deltaTime;
+
+		bool trigger = false;
+		Vector3 before = mTrans.localPosition;
+		Vector3 after = NGUIMath.SpringLerp(mTrans.localPosition, target, strength, delta);
+
+		if ((after - target).sqrMagnitude < 0.01f)
+		{
+			after = target;
+			enabled = false;
+			trigger = true;
+		}
+		mTrans.localPosition = after;
+
+		Vector3 offset = after - before;
+		Vector2 cr = mPanel.clipOffset;
+		cr.x -= offset.x;
+		cr.y -= offset.y;
+		mPanel.clipOffset = cr;
+
+		if (mDrag != null) mDrag.UpdateScrollbars(false);
+
+		if (trigger && onFinished != null)
+		{
+			current = this;
+			onFinished();
+			current = null;
+		}
+    }
+
+	/// <summary>
+	/// Start the tweening process.
+	/// </summary>
+
+	static public SpringPanel Begin (GameObject go, Vector3 pos, float strength)
+	{
+		SpringPanel sp = go.GetComponent<SpringPanel>();
+		if (sp == null) sp = go.AddComponent<SpringPanel>();
+		sp.target = pos;
+		sp.strength = strength;
+		sp.onFinished = null;
+		sp.enabled = true;
+		return sp;
+	}
+}