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

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+//----------------------------------------------
+//            NGUI: Next-Gen UI kit
+// Copyright © 2011-2015 Tasharen Entertainment
+//----------------------------------------------
+
+using UnityEngine;
+using System.Collections;
+
+/// <summary>
+/// Allows dragging of the specified scroll view by mouse or touch.
+/// </summary>
+
+[AddComponentMenu("NGUI/Interaction/Drag Scroll View")]
+public class UIDragScrollView : MonoBehaviour
+{
+	/// <summary>
+	/// Reference to the scroll view that will be dragged by the script.
+	/// </summary>
+
+	public UIScrollView scrollView;
+
+	// Legacy functionality, kept for backwards compatibility. Use 'scrollView' instead.
+	[HideInInspector][SerializeField] UIScrollView draggablePanel;
+
+	Transform mTrans;
+	UIScrollView mScroll;
+	bool mAutoFind = false;
+	bool mStarted = false;
+
+	/// <summary>
+	/// Automatically find the scroll view if possible.
+	/// </summary>
+
+	void OnEnable ()
+	{
+		mTrans = transform;
+
+		// Auto-upgrade
+		if (scrollView == null && draggablePanel != null)
+		{
+			scrollView = draggablePanel;
+			draggablePanel = null;
+		}
+
+		if (mStarted && (mAutoFind || mScroll == null))
+			FindScrollView();
+	}
+
+	/// <summary>
+	/// Find the scroll view.
+	/// </summary>
+
+	void Start ()
+	{
+		mStarted = true;
+		FindScrollView();
+	}
+
+	/// <summary>
+	/// Find the scroll view to work with.
+	/// </summary>
+
+	void FindScrollView ()
+	{
+		// If the scroll view is on a parent, don't try to remember it (as we want it to be dynamic in case of re-parenting)
+		UIScrollView sv = NGUITools.FindInParents<UIScrollView>(mTrans);
+
+		if (scrollView == null || (mAutoFind && sv != scrollView))
+		{
+			scrollView = sv;
+			mAutoFind = true;
+		}
+		else if (scrollView == sv)
+		{
+			mAutoFind = true;
+		}
+		mScroll = scrollView;
+	}
+
+	/// <summary>
+	/// Create a plane on which we will be performing the dragging.
+	/// </summary>
+
+	public void OnPress (bool pressed) // modify by chenbin
+	{
+		// If the scroll view has been set manually, don't try to find it again
+		if (mAutoFind && mScroll != scrollView)
+		{
+			mScroll = scrollView;
+			mAutoFind = false;
+		}
+
+		if (scrollView && enabled && NGUITools.GetActive(gameObject))
+		{
+			scrollView.Press(pressed);
+			
+			if (!pressed && mAutoFind)
+			{
+				scrollView = NGUITools.FindInParents<UIScrollView>(mTrans);
+				mScroll = scrollView;
+			}
+		}
+	}
+
+	/// <summary>
+	/// Drag the object along the plane.
+	/// </summary>
+
+	public void OnDrag (Vector2 delta) // modify by chenbin
+	{
+		if (scrollView && NGUITools.GetActive(this))
+			scrollView.Drag();
+	}
+
+	/// <summary>
+	/// If the object should support the scroll wheel, do it.
+	/// </summary>
+
+	void OnScroll (float delta)
+	{
+		if (scrollView && NGUITools.GetActive(this))
+			scrollView.Scroll(delta);
+	}
+}