Unity3D研究院编辑器之不影响原有布局拓展Inspector

今天无意间发现了一篇好文章，也让我解决了一个很久都没解决的难题。问题是这样的，假如我想去拓展Unity自带的inspector但是并不想影响原有布局。 比如下面这段代码：

 

 

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[CustomEditor(typeof(RectTransform))] public class MyTest : Editor { public override void OnInspectorGUI () { base.OnInspectorGUI (); if(GUILayout.Button("Adding this button")) { Debug.Log("Adding this button"); } }   }

我的本意是想在Rect Transform面板的下面去添加一个按钮，可是我一旦调用base.OnInspectorGUI()方法以后，原有的布局都就变了。

 

为什么会影响到原有布局呢？原因是这样的上面的代码是继承Editor的，那么base.OnInspectorGUI()实际上去掉用了Editor类里的OnInspectorGUI()方法，可是RectTransfm的OnInspectorGUI()方法是在RectTransformEditor这个类写的。

但是问题就来了，RectTransformEditor这个类不是一个对外公开的类。所以不能继承它，那也就无法调用它的OnInspectorGUI()方法了，所以就有了上述问题。

这里有一个巧妙的反射方法，完美的解决这个问题。https://gist.github.com/liortal53/352fda2d01d339306e03

 

 

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[CustomEditor(typeof(RectTransform))] public class MyTest : DecoratorEditor { public MyTest(): base("RectTransformEditor"){} public override void OnInspectorGUI () { base.OnInspectorGUI (); if(GUILayout.Button("Adding this button")) { Debug.Log("Adding this button"); } } }

理论上unity提供的每一个脚本都有一个 XXXEditor 类 ， 用来绘制它的面板。（本文用到的就是 RectTransformEditor）如果你不确定可以去我反编译的代码里面去找。https://bitbucket.org/xuanyusong/unity-decompiled

如下图所示，现在既保留了原有的布局，也可以方便的拓展了。。

 

 

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using System.Collections.Generic; using System.Linq; using System.Reflection; using UnityEditor; using UnityEngine;   /// <summary> /// A base class for creating editors that decorate Unity's built-in editor types. /// </summary> public abstract class DecoratorEditor : Editor { // empty array for invoking methods using reflection private static readonly object[] EMPTY_ARRAY = new object[0];   #region Editor Fields   /// <summary> /// Type object for the internally used (decorated) editor. /// </summary> private System.Type decoratedEditorType;   /// <summary> /// Type object for the object that is edited by this editor. /// </summary> private System.Type editedObjectType;   private Editor editorInstance;   #endregion   private static Dictionary<string, MethodInfo> decoratedMethods = new Dictionary<string, MethodInfo>();   private static Assembly editorAssembly = Assembly.GetAssembly(typeof(Editor));   protected Editor EditorInstance { get { if (editorInstance == null && targets != null && targets.Length > 0) { editorInstance = Editor.CreateEditor(targets, decoratedEditorType); }   if (editorInstance == null) { Debug.LogError("Could not create editor !"); }   return editorInstance; } }   public DecoratorEditor (string editorTypeName) { this.decoratedEditorType = editorAssembly.GetTypes().Where(t => t.Name == editorTypeName).FirstOrDefault();   Init ();   // Check CustomEditor types. var originalEditedType = GetCustomEditorType(decoratedEditorType);   if (originalEditedType != editedObjectType) { throw new System.ArgumentException( string.Format("Type {0} does not match the editor {1} type {2}",               editedObjectType, editorTypeName, originalEditedType)); } }   private System.Type GetCustomEditorType(System.Type type) { var flags = BindingFlags.NonPublic | BindingFlags.Instance;   var attributes = type.GetCustomAttributes(typeof(CustomEditor), true) as CustomEditor[]; var field = attributes.Select(editor => editor.GetType().GetField("m_InspectedType", flags)).First();   return field.GetValue(attributes[0]) as System.Type; }   private void Init() { var flags = BindingFlags.NonPublic | BindingFlags.Instance;   var attributes = this.GetType().GetCustomAttributes(typeof(CustomEditor), true) as CustomEditor[]; var field = attributes.Select(editor => editor.GetType().GetField("m_InspectedType", flags)).First();   editedObjectType = field.GetValue(attributes[0]) as System.Type; }   void OnDisable() { if (editorInstance != null) { DestroyImmediate(editorInstance); } }   /// <summary> /// Delegates a method call with the given name to the decorated editor instance. /// </summary> protected void CallInspectorMethod(string methodName) { MethodInfo method = null;   // Add MethodInfo to cache if (!decoratedMethods.ContainsKey(methodName)) { var flags = BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public;   method = decoratedEditorType.GetMethod(methodName, flags);   if (method != null) { decoratedMethods[methodName] = method; } else { Debug.LogError(string.Format("Could not find method {0}", method)); } } else { method = decoratedMethods[methodName]; }   if (method != null) { method.Invoke(EditorInstance, EMPTY_ARRAY); } }   public void OnSceneGUI() { CallInspectorMethod("OnSceneGUI"); }   protected override void OnHeaderGUI () { CallInspectorMethod("OnHeaderGUI"); }   public override void OnInspectorGUI () { EditorInstance.OnInspectorGUI(); }   public override void DrawPreview (Rect previewArea) { EditorInstance.DrawPreview (previewArea); }   public override string GetInfoString () { return EditorInstance.GetInfoString (); }   public override GUIContent GetPreviewTitle () { return EditorInstance.GetPreviewTitle(); }   public override bool HasPreviewGUI () { return EditorInstance.HasPreviewGUI (); }   public override void OnInteractivePreviewGUI (Rect r, GUIStyle background) { EditorInstance.OnInteractivePreviewGUI (r, background); }   public override void OnPreviewGUI (Rect r, GUIStyle background) { EditorInstance.OnPreviewGUI (r, background); }   public override void OnPreviewSettings () { EditorInstance.OnPreviewSettings (); }   public override void ReloadPreviewInstances () { EditorInstance.ReloadPreviewInstances (); }   public override Texture2D RenderStaticPreview (string assetPath, Object[] subAssets, int width, int height) { return EditorInstance.RenderStaticPreview (assetPath, subAssets, width, height); }   public override bool RequiresConstantRepaint () { return EditorInstance.RequiresConstantRepaint (); }   public override bool UseDefaultMargins () { return EditorInstance.UseDefaultMargins (); } }

版本： Unity5.3.3

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