First Commit

Assets/Editor/SnapScrollRectEditor.cs

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+using UnityEngine;
+using UnityEditor;
+
+[CustomEditor( typeof(SnapScrollRect))]
+public sealed class SnapScrollRectEditor : Editor {
+
+	public override void OnInspectorGUI(){
+		DrawDefaultInspector ();
+	}
+}

Assets/SnapScrollRect.cs

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+using UnityEngine;
+using System.Collections;
+using UnityEngine.UI;
+using UnityEngine.EventSystems;
+
+public class SnapScrollRect : ScrollRect {
+
+	public int hIndex;
+	public int vIndex;
+
+	public int hPageNum = 3;
+	public int vPageNum = 0;
+	public float smoothness = 10f;
+	public float scrollWeight = 0.1f;
+
+	private Vector2 targetPosition;
+	private float hPerPage;
+	private float vPerPage;
+	private bool dragging;
+	private bool forcePositionUpdate = false;
+
+	public void ScrollTo( int x, int y)
+	{
+		hIndex = x;		
+		vIndex = y;
+		forcePositionUpdate = true;
+	}
+
+	protected override void Awake()
+	{
+		base.Awake();
+		hPerPage = 1f / (float)(hPageNum - 1);
+		vPerPage = 1f / (float)(hPageNum - 1);
+	}
+
+	protected override void Start()
+	{
+		base.Start();
+		targetPosition = GetSnapPosition();
+	}
+
+	public override void OnBeginDrag(PointerEventData eventData)
+	{
+		base.OnBeginDrag(eventData);
+		dragging = true;
+	}
+
+	public override void OnEndDrag(PointerEventData eventData)
+	{
+		base.OnEndDrag(eventData);
+		UpdateIndex();
+		targetPosition = GetSnapPosition();
+		dragging = false;
+	}
+
+	void Update()
+	{
+		if ( !dragging && normalizedPosition != targetPosition )
+		{
+			normalizedPosition = Vector2.Lerp(normalizedPosition, targetPosition, smoothness * Time.deltaTime);
+
+			if ( Vector2.Distance(normalizedPosition, targetPosition) < 0.009f )
+			{
+				normalizedPosition = targetPosition;
+			}
+		}
+
+		if ( forcePositionUpdate )
+		{
+			forcePositionUpdate = false;
+			targetPosition = GetSnapPosition();
+		}
+	}
+
+	void UpdateIndex()
+	{
+		float xPage, yPage = -1;
+
+		if (horizontal && hPageNum > 0)
+		{
+			xPage = (normalizedPosition.x / hPerPage);
+			float diff = xPage - (1 * hIndex);
+
+			if ( diff >= scrollWeight )
+			{
+				hIndex++;
+			}
+			else if ( diff <= -scrollWeight )
+			{
+				hIndex--;
+			}
+		}
+
+		if (vertical && vPageNum > 0)
+		{
+			yPage = normalizedPosition.y / vPerPage;
+			float diff = yPage - (1 * vIndex);
+
+			if ( diff >= scrollWeight )
+			{
+				vIndex++;
+			} else if ( diff <= -scrollWeight )
+			{
+				vIndex--;
+			}
+		}
+	}
+
+	Vector2 GetSnapPosition()
+	{
+		return new Vector2(horizontal && hPageNum > 0 ? hIndex * hPerPage : normalizedPosition.x, vertical && vPageNum > 0 ? vIndex * vPerPage : normalizedPosition.y);
+	}
+}

ProjectSettings/ProjectVersion.txt

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+m_EditorVersion: 5.3.4f1
+m_StandardAssetsVersion: 0