Unity编辑器扩展 Chapter3--Create Custom Inspector

一、Create Custom Inspector

重绘inspector面板一方面是我们的挂在脚本的窗口变得友好，另一方面可以让其变得更强大，比如添加一些有效性验证。

二、重要说明

1.EditorUtility.SetDirty(object target)：该方法可以表明target对象为dirty（(⊙﹏⊙)b，怎么翻译合适？）的，unity会将有dirty标记的已经改变的对象在磁盘中存储，可以用来对一些修改数据的强制刷新，这里用来立即绘制GUI（我们对GUI的修改不会立即生效，只有鼠标在Scene上时才会强制重绘界面元素）。

2.对于类似GUI.Style等静态属性的修改，在修改前需要备份，使用后在设回，避免修改后的对其他无需使用修改后属性的干扰。

3.布局中的GUILayout.BeginVertical等需成对出现，有始有终。

4.该类型的脚本都需放在Editor文件夹下，unity会自动调用。

三、Code

 using UnityEngine;
 using System.Collections;
 using UnityEditor;

 namespace RunAndJump.LeveCreator
 {
     //[CanEditMultipleObjects]  //希望多个挂在该类的对象可以在inspector面板选定多个一同修改的话
     //需要将该标签添加上，由于level类一个场景下只有一个，所以无需添加该标记
     [CustomEditor(typeof(Level))]
     public class LevelInspector : Editor
     {
         private Level _myTarget;
         private int _newTotalColumns;
         private int _newTotalRows;

         private void OnEnable()
         {
             Debug.Log("OnEnable was called...");
             _myTarget = (Level)target;
             InitLevel();
             ResetResizeValues();
         }

         private void OnDisable()
         {
             Debug.Log("OnDisable was called...");
         }

         private void OnDestory()
         {
             Debug.Log("OnDestroy was called...");
         }

         public override void OnInspectorGUI()
         {
             EditorGUILayout.LabelField("The GUI of this inspector was modified.");
             EditorGUILayout.LabelField("The current level time is:"+_myTarget.TotalTime);

 //            DrawDefaultInspector();//使用unity默认的绘制方式来显示Inspector面板
             DrawDateGUI();
             DrawLevelSizeGUI();

             //当使用绘制面板方法并且GUI改变时刷新GUI页面
             if(GUI.changed)
                 EditorUtility.SetDirty(_myTarget);
         }

         private void DrawLevelSizeGUI()
         {
             EditorGUILayout.LabelField("Size",EditorStyles.boldLabel);
             EditorGUILayout.BeginHorizontal("box");
             EditorGUILayout.BeginVertical();
             _newTotalColumns = EditorGUILayout.IntField("Columns", Mathf.Max(, _newTotalColumns));
             _newTotalRows = EditorGUILayout.IntField("Rows", Mathf.Max(, _newTotalRows));
             EditorGUILayout.EndVertical();
             EditorGUILayout.BeginVertical();

             bool oldEnable = GUI.enabled;
             GUI.enabled = (_newTotalColumns != _myTarget.TotalColumns || _newTotalRows != _myTarget.TotalRows);
             bool buttonResize = GUILayout.Button("Resize", GUILayout.Height(*EditorGUIUtility.singleLineHeight));
             if (buttonResize)
             {
                 if (EditorUtility.DisplayDialog(
                     "Level Creator",
                     "Are you sure you want to resize the leve?\nThis action cannot be undone",
                     "yes",
                     "no"
                     ))
                 {
                     ResizeLeve();
                 }

             }

             bool buttonReset = GUILayout.Button("Reset");
             if (buttonReset)
             {
                 ResetResizeValues();
             }
             GUI.enabled = oldEnable;

             EditorGUILayout.EndVertical();
             EditorGUILayout.EndHorizontal();
         }

         private void InitLevel()
         {
             if (_myTarget.Pieces == null || _myTarget.Pieces.Length == )
             {
                 Debug.Log("Initializing thie Pieces array...");
                 _myTarget.Pieces=new LevelPiece[_myTarget.TotalColumns*_myTarget.TotalRows];
             }
         }

         private void ResetResizeValues()
         {
             _newTotalColumns = _myTarget.TotalColumns;
             _newTotalRows = _myTarget.TotalRows;
         }

         private void ResizeLeve()
         {
             LevelPiece[] newPieces=new LevelPiece[_newTotalColumns*_newTotalRows];
             for (int col = ; col < _myTarget.TotalColumns; ++col)
             {
                 for (int row = ; row < _myTarget.TotalRows; ++row)
                 {
                     if (col < _newTotalColumns && row < _newTotalRows)
                     {
                         newPieces[col + row*_newTotalColumns] = _myTarget.Pieces[col + row*_myTarget.TotalColumns];
                     }
                     else
                     {
                         LevelPiece piece = _myTarget.Pieces[col+row*_myTarget.TotalColumns];
                         if (piece != null)
                         {
                             //在editor模式下我们必须使用DestroyImmediate
                             Object.DestroyImmediate(piece.gameObject);
                         }
                     }
                 }
             }
             _myTarget.Pieces = newPieces;
             _myTarget.TotalColumns = _newTotalColumns;
             _myTarget.TotalRows = _newTotalRows;
         }

         private void DrawDateGUI()
         {
             EditorGUILayout.LabelField("Data",EditorStyles.boldLabel);
             EditorGUILayout.BeginVertical("box");
             _myTarget.TotalTime = EditorGUILayout.IntField("Total Time", Mathf.Max(, _myTarget.TotalTime));
             _myTarget.Gravity = EditorGUILayout.FloatField("Gravity", _myTarget.Gravity);
             _myTarget.Bgm = (AudioClip) EditorGUILayout.ObjectField("Bgm", _myTarget.Bgm, typeof (AudioClip), false);
             _myTarget.Background =
                 (Sprite) EditorGUILayout.ObjectField("Background", _myTarget.Background, typeof (Sprite), false);
             EditorGUILayout.EndVertical();
         }
     }
 }

四、效果

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