为NGUI panel 添加 sorting layer

接着上一篇文章的问题，看到了老外做的一个补丁，为ngui panel添加sorting layer，我也照着做了一个，这样ngui和unity2d就可以完全融合在一起了，层次关系可以任意设置。

ngui的版本为3.6.8，在其中添加代码：

文件：UIDrawCall.cs  109行左右

	/// 

	/// Renderer's sorting order, to be used with Unity's 2D system.
	/// 

	public int sortingOrder
	{
		get { return (mRenderer != null) ? mRenderer.sortingOrder : 0; }
		set { if (mRenderer != null && mRenderer.sortingOrder != value) mRenderer.sortingOrder = value; }
	}

	// added by Clark
	public string sortingLayerName
	{
		get { return (mRenderer != null) ? mRenderer.sortingLayerName : "default"; }
		set
		{
			if(mRenderer != null && mRenderer.sortingLayerName != value)
			{
				mRenderer.sortingLayerName = value;
#if UNITY_EDITOR
				UnityEditor.EditorUtility.SetDirty(gameObject);
#endif
			}
		}
	}
	// added end by Clark

712行左右

	/// 

	/// Create a new draw call, reusing an old one if possible.
	/// 

	static UIDrawCall Create (string name, UIPanel pan, Material mat, Texture tex, Shader shader)
	{
		UIDrawCall dc = Create(name);
		dc.gameObject.layer = pan.cachedGameObject.layer;
		dc.baseMaterial = mat;
		dc.mainTexture = tex;
		dc.shader = shader;
		dc.renderQueue = pan.startingRenderQueue;
		dc.sortingOrder = pan.sortingOrder;
		// added by Clark
		dc.sortingLayerName = pan.sortingLayerName;
		// added end by Clark
		dc.manager = pan;
		return dc;
	}

文件UIPanel.cs 130行左右

	// Clipping rectangle
	[HideInInspector][SerializeField] UIDrawCall.Clipping mClipping = UIDrawCall.Clipping.None;
	[HideInInspector][SerializeField] Vector4 mClipRange = new Vector4(0f, 0f, 300f, 200f);
	[HideInInspector][SerializeField] Vector2 mClipSoftness = new Vector2(4f, 4f);
	[HideInInspector][SerializeField] int mDepth = 0;
	[HideInInspector][SerializeField] int mSortingOrder = 0;
	// added by Clark
	[HideInInspector][SerializeField] string mSortingLayerName;
	// added end by Clark

252行左右

	public int sortingOrder
	{
		get
		{
			return mSortingOrder;
		}
		set
		{
			if (mSortingOrder != value)
			{
				mSortingOrder = value;
#if UNITY_EDITOR
				NGUITools.SetDirty(this);
#endif
				UpdateDrawCalls();
			}
		}
	}

	// added by Clark
	public string sortingLayerName
	{
		get { return mSortingLayerName; }
		set
		{
			if(mSortingLayerName != value)
			{
				mSortingLayerName = value;
#if UNITY_EDITOR
				NGUITools.SetDirty(this);
#endif
				UpdateDrawCalls();
			}
		}
	}
	// added end by Clark

1432行左右，在函数UpdateDrawCalls里面

		for (int i = 0; i < drawCalls.Count; ++i)
		{
			UIDrawCall dc = drawCalls[i];

			Transform t = dc.cachedTransform;
			t.position = pos;
			t.rotation = rot;
			t.localScale = scale;

			dc.renderQueue = (renderQueue == RenderQueue.Explicit) ? startingRenderQueue : startingRenderQueue + i;
			dc.alwaysOnScreen = alwaysOnScreen &&
				(mClipping == UIDrawCall.Clipping.None || mClipping == UIDrawCall.Clipping.ConstrainButDontClip);
			dc.sortingOrder = mSortingOrder;
			// added by Clark
			dc.sortingLayerName = mSortingLayerName;
			// added end by Clark
		}

文件UIPanelInspector.cs 9行

using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
// added by Clark
using System;
using System.Reflection;
using UnityEditorInternal;
// added end by Clark

39行左右

	UIWidget.Pivot mDragPivot = UIWidget.Pivot.Center;
	GUIStyle mStyle0 = null;
	GUIStyle mStyle1 = null;
	// added by Clark
	string[] sortingLayerNames;
	// added end by Clark

49行左右

	protected override void OnEnable ()
	{
		base.OnEnable();
		mPanel = target as UIPanel;

		// added by Clark
		sortingLayerNames = GetSortingLayerNames();
		// added end by Clark
	}

574行左右

			GUI.changed = false;
			int so = EditorGUILayout.IntField("Sort Order", mPanel.sortingOrder, GUILayout.Width(120f));
			if (GUI.changed) mPanel.sortingOrder = so;

			// added by Clark
			int sortingLayerIndex = GetSortingLayerIndex(mPanel.sortingLayerName);
			int newSortingLayerIndex = EditorGUILayout.Popup("Sorting Layer", sortingLayerIndex, sortingLayerNames);
			if(sortingLayerIndex != newSortingLayerIndex)
			{
				mPanel.sortingLayerName = sortingLayerNames[newSortingLayerIndex];
			}
			// added end by Clark

785行左右，在文件最后

	// added by Clark
	string[] GetSortingLayerNames() 
	{
		Type t = typeof(InternalEditorUtility);
		PropertyInfo prop = t.GetProperty("sortingLayerNames", BindingFlags.Static | BindingFlags.NonPublic);
		return (string[])prop.GetValue(null, null);
	}

	int GetSortingLayerIndex(string layerName)
	{
		for(int i = 0; i < sortingLayerNames.Length; i++)
		{
			if(sortingLayerNames[i] == layerName)
			{
				return i;
			}
		}

		return 0;
	}
	// added end by Clark
}

这样，在UIPanel里面就多一个选项sorting layer：

完整的修改好的文件我放到我的资源里面了。