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Assets/CoolapeFrame/3rd/NGUI_Enhance/Scripts/Interaction/UICenterOnChild.cs

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+//----------------------------------------------
+//            NGUI: Next-Gen UI kit
+// Copyright © 2011-2015 Tasharen Entertainment
+//----------------------------------------------
+
+using UnityEngine;
+using System.Collections.Generic;
+using Coolape;
+
+/// <summary>
+/// Ever wanted to be able to auto-center on an object within a draggable panel?
+/// Attach this script to the container that has the objects to center on as its children.
+/// </summary>
+
+[AddComponentMenu("NGUI/Interaction/Center Scroll View on Child")]
+public class UICenterOnChild : MonoBehaviour
+{
+	public delegate void OnCenterCallback (GameObject centeredObject);
+
+	/// <summary>
+	/// The strength of the spring.
+	/// </summary>
+
+	public float springStrength = 8f;
+
+	/// <summary>
+	/// If set to something above zero, it will be possible to move to the next page after dragging past the specified threshold.
+	/// </summary>
+
+	public float nextPageThreshold = 0f;
+
+	/// <summary>
+	/// Callback to be triggered when the centering operation completes.
+	/// </summary>
+
+	public SpringPanel.OnFinished onFinished;
+
+	/// <summary>
+	/// Callback triggered whenever the script begins centering on a new child object.
+	/// </summary>
+
+	public OnCenterCallback onCenter;
+
+	UIScrollView mScrollView;
+	GameObject mCenteredObject;
+
+	/// <summary>
+	/// Game object that the draggable panel is currently centered on.
+	/// </summary>
+
+	public GameObject centeredObject { get { return mCenteredObject; } }
+
+	void Start () { Recenter(); }
+	void OnEnable () { if (mScrollView) { mScrollView.centerOnChild = this; Recenter(); } }
+	void OnDisable () { if (mScrollView) mScrollView.centerOnChild = null; }
+	void OnDragFinished () { if (enabled) Recenter(); }
+
+	/// <summary>
+	/// Ensure that the threshold is always positive.
+	/// </summary>
+
+	void OnValidate () { nextPageThreshold = Mathf.Abs(nextPageThreshold); }
+
+	/// <summary>
+	/// Recenter the draggable list on the center-most child.
+	/// </summary>
+
+	[ContextMenu("Execute")]
+	public void Recenter ()
+	{
+		if (mScrollView == null)
+		{
+			mScrollView = NGUITools.FindInParents<UIScrollView>(gameObject);
+
+			if (mScrollView == null)
+			{
+				Debug.LogWarning(GetType() + " requires " + typeof(UIScrollView) + " on a parent object in order to work", this);
+				enabled = false;
+				return;
+			}
+			else
+			{
+				if (mScrollView)
+				{
+					mScrollView.centerOnChild = this;
+					mScrollView.onDragFinished += OnDragFinished;
+				}
+
+				if (mScrollView.horizontalScrollBar != null)
+					mScrollView.horizontalScrollBar.onDragFinished += OnDragFinished;
+
+				if (mScrollView.verticalScrollBar != null)
+					mScrollView.verticalScrollBar.onDragFinished += OnDragFinished;
+			}
+		}
+		if (mScrollView.panel == null) return;
+
+		Transform trans = transform;
+		if (trans.childCount == 0) return;
+
+		// Calculate the panel's center in world coordinates
+		Vector3[] corners = mScrollView.panel.worldCorners;
+		Vector3 panelCenter = (corners[2] + corners[0]) * 0.5f;
+
+		// Offset this value by the momentum
+		Vector3 momentum = mScrollView.currentMomentum * mScrollView.momentumAmount;
+		Vector3 moveDelta = NGUIMath.SpringDampen(ref momentum, 9f, 2f);
+		Vector3 pickingPoint = panelCenter - moveDelta * 0.01f; // Magic number based on what "feels right"
+
+		float min = float.MaxValue;
+		Transform closest = null;
+		int index = 0;
+		int ignoredIndex = 0;
+
+		// Determine the closest child
+		for (int i = 0, imax = trans.childCount, ii = 0; i < imax; ++i)
+		{
+			Transform t = trans.GetChild(i);
+			if (!t.gameObject.activeInHierarchy) continue;
+			float sqrDist = Vector3.SqrMagnitude(t.position - pickingPoint);
+
+			if (sqrDist < min)
+			{
+				min = sqrDist;
+				closest = t;
+				index = i;
+				ignoredIndex = ii;
+			}
+			++ii;
+		}
+
+		// If we have a touch in progress and the next page threshold set
+		if (nextPageThreshold > 0f && UICamera.currentTouch != null)
+		{
+			// If we're still on the same object
+			if (mCenteredObject != null && mCenteredObject.transform == trans.GetChild(index))
+			{
+				Vector3 totalDelta = UICamera.currentTouch.totalDelta;
+				totalDelta = transform.rotation * totalDelta;
+
+				float delta = 0f;
+
+				switch (mScrollView.movement)
+				{
+					case UIScrollView.Movement.Horizontal:
+					{
+						delta = totalDelta.x;
+						break;
+					}
+					case UIScrollView.Movement.Vertical:
+					{
+						delta = totalDelta.y;
+						break;
+					}
+					default:
+					{
+						delta = totalDelta.magnitude;
+						break;
+					}
+				}
+
+				if (Mathf.Abs(delta) > nextPageThreshold)
+				{
+					UIGrid grid = GetComponent<UIGrid>();
+					CLUILoopGrid loopGrid = GetComponent<CLUILoopGrid>(); // add by chenbin
+					if (loopGrid == null) {
+						if (grid != null && grid.sorting != UIGrid.Sorting.None) {
+							List<Transform> list = grid.GetChildList ();
+
+							if (delta > nextPageThreshold) {
+								// Next page
+								if (ignoredIndex > 0)
+									closest = list [ignoredIndex - 1];
+								else
+									closest = (GetComponent<UIWrapContent> () == null) ? list [0] : list [list.Count - 1];
+							} else if (delta < -nextPageThreshold) {
+								// Previous page
+								if (ignoredIndex < list.Count - 1)
+									closest = list [ignoredIndex + 1];
+								else
+									closest = (GetComponent<UIWrapContent> () == null) ? list [list.Count - 1] : list [0];
+							}
+						} else
+							Debug.LogWarning ("Next Page Threshold requires a sorted UIGrid in order to work properly", this);
+						#region add by chenbin
+					} else {
+						int _index = NumEx.stringToInt(closest.name);
+						if (delta > nextPageThreshold) {
+							// Next page
+							if (_index > 0) {
+								_index--;
+								closest = trans.Find(NumEx.nStrForLen(_index, 6));
+							}
+						} else if (delta < -nextPageThreshold) {
+							// Previous page
+							if (_index < loopGrid.list.Count - 1) {
+								_index++;
+								closest = trans.Find(NumEx.nStrForLen(_index, 6));
+							}
+						}
+					}
+					#endregion
+				}
+			}
+		}
+		CenterOn(closest, panelCenter);
+	}
+
+	/// <summary>
+	/// Center the panel on the specified target.
+	/// </summary>
+
+	void CenterOn (Transform target, Vector3 panelCenter)
+	{
+		if (target != null && mScrollView != null && mScrollView.panel != null)
+		{
+			Transform panelTrans = mScrollView.panel.cachedTransform;
+			mCenteredObject = target.gameObject;
+
+			// Figure out the difference between the chosen child and the panel's center in local coordinates
+			Vector3 cp = panelTrans.InverseTransformPoint(target.position);
+			Vector3 cc = panelTrans.InverseTransformPoint(panelCenter);
+			Vector3 localOffset = cp - cc;
+
+			// Offset shouldn't occur if blocked
+			if (!mScrollView.canMoveHorizontally) localOffset.x = 0f;
+			if (!mScrollView.canMoveVertically) localOffset.y = 0f;
+			localOffset.z = 0f;
+
+			// Spring the panel to this calculated position
+#if UNITY_EDITOR
+			if (!Application.isPlaying)
+			{
+				panelTrans.localPosition = panelTrans.localPosition - localOffset;
+
+				Vector4 co = mScrollView.panel.clipOffset;
+				co.x += localOffset.x;
+				co.y += localOffset.y;
+				mScrollView.panel.clipOffset = co;
+			}
+			else
+#endif
+			{
+				SpringPanel.Begin(mScrollView.panel.cachedGameObject,
+					panelTrans.localPosition - localOffset, springStrength).onFinished = onFinished;
+			}
+		}
+		else mCenteredObject = null;
+
+		// Notify the listener
+		if (onCenter != null) onCenter(mCenteredObject);
+	}
+
+	/// <summary>
+	/// Center the panel on the specified target.
+	/// </summary>
+
+	public void CenterOn (Transform target)
+	{
+		if (mScrollView != null && mScrollView.panel != null)
+		{
+			Vector3[] corners = mScrollView.panel.worldCorners;
+			Vector3 panelCenter = (corners[2] + corners[0]) * 0.5f;
+			CenterOn(target, panelCenter);
+		}
+	}
+}