来自：candycat1992

http://blog.csdn.net/candycat1992/article/details/52067975

写在前面

Unity最强大的地方之一是它扩展性非常强的编辑器。Unite Europe 2016上有一个视频专门讲编辑器编程的：

https://www.youtube.com/watch?v=9bHzTDIJX_Q

这里大概记录一下里面的关键点。

场景一

关注点：

绘制重要区域，Gizmos.DrawXXX
OnDrawGizmos和OnDrawGizmosSelected回调函数
点击Gizmos按钮就可以在Game视图也看到线框了

    // OnDrawGizmos()会在编辑器的Scene视图刷新的时候被调用// 我们可以在这里绘制一些用于Debug的数据void OnDrawGizmos(){Gizmos.color = new Color( 1f, 0f, 0f, 1f );Gizmos.DrawWireCube( transform.position + BoxCollider.center, BoxCollider.size );Gizmos.color = new Color( 1f, 0f, 0f, 0.3f );Gizmos.DrawCube( transform.position + BoxCollider.center, BoxCollider.size );}// OnDrawGizmosSelect()类似于OnDrawGizmos()，它会在当该组件所属的物体被选中时被调用void OnDrawGizmosSelected(){Gizmos.color = new Color( 1f, 1f, 0f, 1f );Gizmos.DrawWireCube( transform.position + BoxCollider.center, BoxCollider.size );Gizmos.color = new Color( 1f, 1f, 0f, 0.3f );Gizmos.DrawCube( transform.position + BoxCollider.center, BoxCollider.size );}

场景二

关注点：

组织面板上的参数，添加滑动条、Header、空白等

    [Space( 10 )]public float MaximumHeight;public float MinimumHeight;[Header( "Safe Frame" )][Range( 0f, 1f )]public float SafeFrameTop;[Range( 0f, 1f )]public float SafeFrameBottom;

注意到上面面板的最小面有个Camera Height，调节它可以改变摄像机的高度。这个改变是可以发生在编辑器模式下的，而且也不需要脚本添加ExecuteInEditor。这是通过实现自定义的Editor脚本来实现的：

using UnityEngine;
using UnityEditor;
using System.Collections;// 我们可以通过为一个类定义它的Editor类型的[CustomEditor]来自定义该类的绘制界面
// 这需要把这个文件放在Editor目录下
[CustomEditor( typeof( GameCamera ) )]
public class GameCameraEditor : Editor
{GameCamera m_Target;// 重载OnInspectorGUI()来绘制自己的编辑器public override void OnInspectorGUI(){// target可以让我们得到当前绘制的Component对象m_Target = (GameCamera)target;// DrawDefaultInspector告诉Unity按照默认的方式绘制面板，这种方法在我们仅仅想要自定义某几个属性的时候会很有用DrawDefaultInspector();DrawCameraHeightPreviewSlider();  }void DrawCameraHeightPreviewSlider(){GUILayout.Space( 10 );Vector3 cameraPosition = m_Target.transform.position;cameraPosition.y = EditorGUILayout.Slider( "Camera Height", cameraPosition.y, m_Target.MinimumHeight, m_Target.MaximumHeight );if( cameraPosition.y != m_Target.transform.position.y ){// 改变状态前，使用该方法来记录操作，以便之后UndoUndo.RecordObject( m_Target, "Change Camera Height" );m_Target.transform.position = cameraPosition;}}
}

场景三

关注点：

自定义绘制List对象
使用serializedObject来修改参数的话Unity会自动有各种帮助函数，例如自动添加Undo功能
如果直接修改参数的话，需要使用EditorUtility.SetDirty来告诉Unity需要保存数据
BeginChangeCheck()和EndChangeCheck()会检测它们之间的GUI有没有被修改，如果修改了的话可以据此修改参数
Undo.RecordObject可以为下一步修改添加Undo/Redo
EditorUtility.DisplayDialog可以打开内置对话框

首先在面板上隐藏默认的List绘制方法，使用HideInInspector隐藏属性：

public class PistonE03 : MonoBehaviour
{public float Speed;public Vector3 AddForceWhenHittingPlayer;//We are hiding this in the inspector because we want to draw our own custom//inspector for it.[HideInInspector]public List<PistonState> States = new List<PistonState>();......

为了让PistonState可以显示在面板上，需要序列化PistonState：

//[System.Serializable] tells unity to serialize this class if
//it's used in a public array or as a public variable in a component
[System.Serializable]
public class PistonState
{public string Name;public Vector3 Position;
}

实现自定义的绘制方程：

[CustomEditor( typeof( PistonE03 ) )]
public class PistonE03Editor : Editor
{PistonE03 m_Target;public override void OnInspectorGUI(){m_Target = (PistonE03)target;DrawDefaultInspector();DrawStatesInspector();        }//Draw a beautiful and useful custom inspector for our states arrayvoid DrawStatesInspector(){GUILayout.Space( 5 );GUILayout.Label( "States", EditorStyles.boldLabel );for( int i = 0; i < m_Target.States.Count; ++i ){DrawState( i );}DrawAddStateButton();}

DrawDefaultInspector：先绘制默认的，DrawStatesInspector：自定义绘制面板函数。

DrawState函数：

 void DrawState( int index )
{if( index < 0 || index >= m_Target.States.Count ){return;}// 在我们的serializedObject中找到States变量// serializedObject允许我们方便地访问和修改参数，Unity会提供一系列帮助函数。例如，我们可以通过serializedObject来修改组件值，而不是直接修改，Unity会自动创建Undo和Redo功能SerializedProperty listIterator = serializedObject.FindProperty( "States" );GUILayout.BeginHorizontal();{// 如果是在实例化的prefab上修改参数，我们可以模仿Unity默认的途径来让修改过的而且未被Apply的值显示成粗体if( listIterator.isInstantiatedPrefab == true ){//The SetBoldDefaultFont functionality is usually hidden from us but we can use some tricks to//access the method anyways. See the implementation of our own EditorGUIHelper.SetBoldDefaultFont//for more infoEditorGUIHelper.SetBoldDefaultFont( listIterator.GetArrayElementAtIndex( index ).prefabOverride );}GUILayout.Label( "Name", EditorStyles.label, GUILayout.Width( 50 ) );// BeginChangeCheck()和EndChangeCheck()会检测它们之间的GUI有没有被修改EditorGUI.BeginChangeCheck();string newName = GUILayout.TextField( m_Target.States[ index ].Name, GUILayout.Width( 120 ) );Vector3 newPosition = EditorGUILayout.Vector3Field( "", m_Target.States[ index ].Position );// 如果修改了的话EndChangeCheck()就会返回true，此时我们就可以进行一些操作例如存储变化的数值if( EditorGUI.EndChangeCheck() ){//Create an Undo/Redo step for this modificationUndo.RecordObject( m_Target, "Modify State" );m_Target.States[ index ].Name = newName;m_Target.States[ index ].Position = newPosition;// 如果我们直接修改属性，而没有通过serializedObject，那么Unity并不会保存这些数据，Unity只会保存那些标识为dirty的属性EditorUtility.SetDirty( m_Target );}EditorGUIHelper.SetBoldDefaultFont( false );if( GUILayout.Button( "Remove" ) ){EditorApplication.Beep();// 可以很方便的显示一个包含特定按钮的对话框，例如是否同意删除if( EditorUtility.DisplayDialog( "Really?", "Do you really want to remove the state '" + m_Target.States[ index ].Name + "'?", "Yes", "No" ) == true ){Undo.RecordObject( m_Target, "Delete State" );m_Target.States.RemoveAt( index );EditorUtility.SetDirty( m_Target );}}}GUILayout.EndHorizontal();

场景四

关注点：

可排序的数组面板，通过使用ReorderableList来实现的，以及它的各个回调函数

using UnityEngine;
using UnityEditor;
// UnityEditorInternal是Unity内部使用、还未开放给用用户的一些库，可能有一些很有意思的类，例如ReorderableList，但注意可能会随着新版本发生变化
using UnityEditorInternal;
using System.Collections;// CanEditMultipleObjects告诉Unity，当我们选择同一种类型的多个组件时，我们自定义的面板是可以支持同时修改所有选中的组件的
// 如果我们在修改参数时使用的是serializedObject，那么这个功能Unity会自动完成的
// 但如果我们是直接使用"target"来访问和修改参数的话，这个变量只能访问到选中的第一个组件
// 此时我们可以使用"targets"来得到所有选中的相同组件
[CanEditMultipleObjects]
[CustomEditor( typeof( PistonE04Pattern ) )]
public class PistonE04PatternEditor : Editor
{// UnityEditorInternal中提供了一种可排序的列表面板显示类ReorderableList m_List;PistonE03 m_Piston;// OnEnable会在自定义面板被打开的时候调用，例如当选中一个包含了PistonE04Pattern的gameobject时void OnEnable(){if( target == null ){return;}FindPistonComponent();CreateReorderableList();SetupReoirderableListHeaderDrawer();SetupReorderableListElementDrawer();SetupReorderableListOnAddDropdownCallback();}void FindPistonComponent(){m_Piston = ( target as PistonE04Pattern ).GetComponent<PistonE03>();}void CreateReorderableList(){// ReorderableList是一个非常棒的查看数组类型变量的实现类。它位于UnityEditorInternal中，这意味着Unity并没有觉得该类足够好到可以开放给公众// 更多关于ReorderableLists的内容可参考：// http://va.lent.in/unity-make-your-lists-functional-with-reorderablelist/m_List = new ReorderableList(serializedObject,serializedObject.FindProperty( "Pattern" ),true, true, true, true );}void SetupReoirderableListHeaderDrawer(){// ReorderableList有一系列回调函数来让我们重载绘制这些数组// 这里我们使用drawHeaderCallback来绘制表格的头headers// 每个回调会接受一个Rect变量，它包含了该元素绘制的位置// 因此我们可以使用这个变量来决定我们把当前的元素绘制在哪里m_List.drawHeaderCallback = ( Rect rect ) =>{EditorGUI.LabelField( new Rect( rect.x, rect.y, rect.width - 60, rect.height ), "State" );EditorGUI.LabelField(new Rect( rect.x + rect.width - 60, rect.y, 60, rect.height ),"Delay" );};}void SetupReorderableListElementDrawer(){// drawElementCallback会定义列表中的每个元素是如何被绘制的// 同样，保证我们绘制的元素是相对于Rect参数绘制的m_List.drawElementCallback =( Rect rect, int index, bool isActive, bool isFocused ) =>{var element = m_List.serializedProperty.GetArrayElementAtIndex( index );rect.y += 2;float delayWidth = 60;float nameWidth = rect.width - delayWidth;EditorGUI.PropertyField(new Rect( rect.x, rect.y, nameWidth - 5, EditorGUIUtility.singleLineHeight ),element.FindPropertyRelative( "Name" ), GUIContent.none );EditorGUI.PropertyField(new Rect( rect.x + nameWidth, rect.y, delayWidth, EditorGUIUtility.singleLineHeight ),element.FindPropertyRelative( "DelayAfterwards" ), GUIContent.none );};}void SetupReorderableListOnAddDropdownCallback(){// onAddDropdownCallback定义当我们点击列表下面的[+]按钮时发生的事件// 在本例里，我们想要显示一个下拉菜单来给出预定义的一些Statesm_List.onAddDropdownCallback = ( Rect buttonRect, ReorderableList l ) =>{if( m_Piston.States == null || m_Piston.States.Count == 0 ){EditorApplication.Beep();EditorUtility.DisplayDialog( "Error", "You don't have any states defined in the PistonE03 component", "Ok" );return;}var menu = new GenericMenu();foreach( PistonState state in m_Piston.States ){menu.AddItem( new GUIContent( state.Name ),false,OnReorderableListAddDropdownClick,state );}menu.ShowAsContext();};}// 这个回调函数会在用户选择了[+]下拉菜单中的某一项后调用void OnReorderableListAddDropdownClick( object target ) {PistonState state = (PistonState)target;int index = m_List.serializedProperty.arraySize;m_List.serializedProperty.arraySize++;m_List.index = index;SerializedProperty element = m_List.serializedProperty.GetArrayElementAtIndex( index );element.FindPropertyRelative( "Name" ).stringValue = state.Name;element.FindPropertyRelative( "DelayAfterwards" ).floatValue = 0f;serializedObject.ApplyModifiedProperties();}  public override void OnInspectorGUI(){GUILayout.Space( 5 );EditorGUILayout.PropertyField( serializedObject.FindProperty( "DelayPatternAtBeginning" ) );serializedObject.ApplyModifiedProperties();serializedObject.Update();m_List.DoLayoutList();serializedObject.ApplyModifiedProperties();}
}

场景五

关注点：

实现了一个可以在编辑器状态下预览效果的编辑器窗口

using UnityEngine;
// 要实现自定义窗口需要包含进来UnityEditor
using UnityEditor;
using System.Collections;// EditorWindow是另一个非常有用的Editor类。我们可以靠它来定义自己的窗口
public class PreviewPlaybackWindow : EditorWindow
{// MenuItem可以让我们在菜单栏中打开这个窗口[MenuItem( "Window/Preview Playback Window" )]static void OpenPreviewPlaybackWindow(){EditorWindow.GetWindow<PreviewPlaybackWindow>( false, "Playback" );// 另一个有用的写法是下面这样// 可以让我们访问到窗口的属性，例如定义最小尺寸等//EditorWindow window = EditorWindow.GetWindow<PreviewPlaybackWindow>( false, "Playback" );//window.minSize = new Vector2(100.0f, 100.0f);}float m_PlaybackModifier;float m_LastTime;void OnEnable(){// Update函数会每秒调用30次来刷新编辑器界面// 我们可以据此来注册自己的编辑器Update函数EditorApplication.update -= OnUpdate;EditorApplication.update += OnUpdate;}void OnDisable(){EditorApplication.update -= OnUpdate;}void OnUpdate(){if( m_PlaybackModifier != 0f ){// PreviewTime是自定义的一个类：//public class PreviewTime //{//    public static float Time//    {//        get//        {//            if( Application.isPlaying == true )//            {//                return UnityEngine.Time.timeSinceLevelLoad;//            }//            // EditorPrefsle类似于PlayerPrefs但只在编辑器状态下工作//            // 我们可以据此来存储变量，基本我们关闭了编辑器该变量也可以长久保存//            return EditorPrefs.GetFloat( "PreviewTime", 0f );//        }//        set//        {//            EditorPrefs.SetFloat( "PreviewTime", value );//        }//    }//}// m_PlaybackModifier是用于控制预览播放速率的变量// 当它不为0的时候，说明需要刷新界面，更新时间PreviewTime.Time += ( Time.realtimeSinceStartup - m_LastTime ) * m_PlaybackModifier;// 当预览时间改变时，我们需要确保重绘这个窗口以便我们可以立即看到它的更新// 而Unity只会在它认为该窗口需要重绘时（例如我们移动了窗口）才会重绘// 因此我们可以调用Repaint函数来强制马上重绘Repaint();// 由于预览时间发生了变化，我们也希望可以立刻重绘Scene视图的界面SceneView.RepaintAll();}m_LastTime = Time.realtimeSinceStartup;}void OnGUI(){// 绘制各个按钮来控制预览时间float seconds = Mathf.Floor( PreviewTime.Time % 60 );float minutes = Mathf.Floor( PreviewTime.Time / 60 );GUILayout.Label( "Preview Time: " + minutes + ":" + seconds.ToString( "00" ) );GUILayout.Label( "Playback Speed: " + m_PlaybackModifier );GUILayout.BeginHorizontal();{if( GUILayout.Button( "|<", GUILayout.Height( 30 ) ) ){PreviewTime.Time = 0f;SceneView.RepaintAll();}if( GUILayout.Button( "<<", GUILayout.Height( 30 ) ) ){m_PlaybackModifier = -5f;}if( GUILayout.Button( "<", GUILayout.Height( 30 ) ) ){m_PlaybackModifier = -1f;}if( GUILayout.Button( "||", GUILayout.Height( 30 ) ) ){m_PlaybackModifier = 0f;}if( GUILayout.Button( ">", GUILayout.Height( 30 ) ) ){m_PlaybackModifier = 1f;}if( GUILayout.Button( ">>", GUILayout.Height( 30 ) ) ){m_PlaybackModifier = 5f;}}GUILayout.EndHorizontal();}
}

为了在编辑器状态下可以查看到cube的运动，我们还需要实现OnDrawGizmos来绘制一些线框表示运动。原理就是使用PreviewTime.Time来控制运动。

场景六

关注点：

在Scene视图中，鼠标的位置绘制特定的Handle

using UnityEngine;
using UnityEditor;
using System.Collections;// [InitializeOnLoad]可以确保这个类的构造器在编辑器加载时就被调用
[InitializeOnLoad]
public class LevelEditorE06CubeHandle : Editor
{public static Vector3 CurrentHandlePosition = Vector3.zero;public static bool IsMouseInValidArea = false;static Vector3 m_OldHandlePosition = Vector3.zero;static LevelEditorE06CubeHandle(){//The OnSceneGUI delegate is called every time the SceneView is redrawn and allows you//to draw GUI elements into the SceneView to create in editor functionality// OnSceneGUI委托在Scene视图每次被重绘时被调用// 这允许我们可以在Scene视图绘制自定义的GUI元素SceneView.onSceneGUIDelegate -= OnSceneGUI;SceneView.onSceneGUIDelegate += OnSceneGUI;}void OnDestroy(){SceneView.onSceneGUIDelegate -= OnSceneGUI;}static void OnSceneGUI( SceneView sceneView ){if( IsInCorrectLevel() == false ){return;}bool isLevelEditorEnabled = EditorPrefs.GetBool( "IsLevelEditorEnabled", true );//Ignore this. I am using this because when the scene GameE06 is opened we haven't yet defined any On/Off buttons//for the cube handles. That comes later in E07. This way we are forcing the cube handles state to On in this scene{if( UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().name == "GameE06" ){isLevelEditorEnabled = true;}}if( isLevelEditorEnabled == false ){return;}// 更新Handle的位置UpdateHandlePosition();// 检查鼠标所在的位置是否有效UpdateIsMouseInValidArea( sceneView.position );// 检测是否需要重新绘制HandleUpdateRepaint();DrawCubeDrawPreview();}//I will use this type of function in many different classes. Basically this is useful to //be able to draw different types of the editor only when you are in the correct scene so we//can have an easy to follow progression of the editor while hoping between the different scenesstatic bool IsInCorrectLevel(){return UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().name == "GameE06"|| UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().name == "GameE07"|| UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().name == "GameE08"|| UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().name == "GameE09";}static void UpdateIsMouseInValidArea( Rect sceneViewRect ){// 确保cube handle只在需要的区域内绘制// 在本例我们就是当鼠标移动到自定义的GUI上或更低的位置上时，就简单地隐藏掉handlebool isInValidArea = Event.current.mousePosition.y < sceneViewRect.height - 35;if( isInValidArea != IsMouseInValidArea ){IsMouseInValidArea = isInValidArea;SceneView.RepaintAll();}}static void UpdateHandlePosition(){if( Event.current == null ){return;}Vector2 mousePosition = new Vector2( Event.current.mousePosition.x, Event.current.mousePosition.y );Ray ray = HandleUtility.GUIPointToWorldRay( mousePosition );RaycastHit hit;if( Physics.Raycast( ray, out hit, Mathf.Infinity, 1 << LayerMask.NameToLayer( "Level" ) ) == true ){Vector3 offset = Vector3.zero;if( EditorPrefs.GetBool( "SelectBlockNextToMousePosition", true ) == true ){offset = hit.normal;}CurrentHandlePosition.x = Mathf.Floor( hit.point.x - hit.normal.x * 0.001f + offset.x );CurrentHandlePosition.y = Mathf.Floor( hit.point.y - hit.normal.y * 0.001f + offset.y );CurrentHandlePosition.z = Mathf.Floor( hit.point.z - hit.normal.z * 0.001f + offset.z );CurrentHandlePosition += new Vector3( 0.5f, 0.5f, 0.5f );}}static void UpdateRepaint(){//If the cube handle position has changed, repaint the sceneif( CurrentHandlePosition != m_OldHandlePosition ){SceneView.RepaintAll();m_OldHandlePosition = CurrentHandlePosition;}}static void DrawCubeDrawPreview(){if( IsMouseInValidArea == false ){return;}Handles.color = new Color( EditorPrefs.GetFloat( "CubeHandleColorR", 1f ), EditorPrefs.GetFloat( "CubeHandleColorG", 1f ), EditorPrefs.GetFloat( "CubeHandleColorB", 0f ) );DrawHandlesCube( CurrentHandlePosition );}static void DrawHandlesCube( Vector3 center ){Vector3 p1 = center + Vector3.up * 0.5f + Vector3.right * 0.5f + Vector3.forward * 0.5f;Vector3 p2 = center + Vector3.up * 0.5f + Vector3.right * 0.5f - Vector3.forward * 0.5f;Vector3 p3 = center + Vector3.up * 0.5f - Vector3.right * 0.5f - Vector3.forward * 0.5f;Vector3 p4 = center + Vector3.up * 0.5f - Vector3.right * 0.5f + Vector3.forward * 0.5f;Vector3 p5 = center - Vector3.up * 0.5f + Vector3.right * 0.5f + Vector3.forward * 0.5f;Vector3 p6 = center - Vector3.up * 0.5f + Vector3.right * 0.5f - Vector3.forward * 0.5f;Vector3 p7 = center - Vector3.up * 0.5f - Vector3.right * 0.5f - Vector3.forward * 0.5f;Vector3 p8 = center - Vector3.up * 0.5f - Vector3.right * 0.5f + Vector3.forward * 0.5f;// 我们可以使用Handles类来在Scene视图绘制3D物体// 如果实现恰当的话，我们甚至可以和handles进行交互，例如Unity的移动工具Handles.DrawLine( p1, p2 );Handles.DrawLine( p2, p3 );Handles.DrawLine( p3, p4 );Handles.DrawLine( p4, p1 );Handles.DrawLine( p5, p6 );Handles.DrawLine( p6, p7 );Handles.DrawLine( p7, p8 );Handles.DrawLine( p8, p5 );Handles.DrawLine( p1, p5 );Handles.DrawLine( p2, p6 );Handles.DrawLine( p3, p7 );   Handles.DrawLine( p4, p8 );}
}

场景七

关注点：

在Scene视图绘制自定义的工具条

using UnityEngine;
using UnityEditor;
using System.Collections;[InitializeOnLoad]
public class LevelEditorE07ToolsMenu : Editor
{//This is a public variable that gets or sets which of our custom tools we are currently using//0 - No tool selected//1 - The block eraser tool is selected//2 - The "Add block" tool is selectedpublic static int SelectedTool{get{return EditorPrefs.GetInt( "SelectedEditorTool", 0 );}set{if( value == SelectedTool ){return;}EditorPrefs.SetInt( "SelectedEditorTool", value );switch( value ){case 0:EditorPrefs.SetBool( "IsLevelEditorEnabled", false );Tools.hidden = false;break;case 1:EditorPrefs.SetBool( "IsLevelEditorEnabled", true );EditorPrefs.SetBool( "SelectBlockNextToMousePosition", false );EditorPrefs.SetFloat( "CubeHandleColorR", Color.magenta.r );EditorPrefs.SetFloat( "CubeHandleColorG", Color.magenta.g );EditorPrefs.SetFloat( "CubeHandleColorB", Color.magenta.b );//Hide Unitys Tool handles (like the move tool) while we draw our own stuffTools.hidden = true;break;default:EditorPrefs.SetBool( "IsLevelEditorEnabled", true );EditorPrefs.SetBool( "SelectBlockNextToMousePosition", true );EditorPrefs.SetFloat( "CubeHandleColorR", Color.yellow.r );EditorPrefs.SetFloat( "CubeHandleColorG", Color.yellow.g );EditorPrefs.SetFloat( "CubeHandleColorB", Color.yellow.b );//Hide Unitys Tool handles (like the move tool) while we draw our own stuffTools.hidden = true;break;}}}static LevelEditorE07ToolsMenu(){SceneView.onSceneGUIDelegate -= OnSceneGUI;SceneView.onSceneGUIDelegate += OnSceneGUI;// EditorApplication.hierarchyWindowChanged可以让我们知道是否在编辑器加载了一个新的场景EditorApplication.hierarchyWindowChanged -= OnSceneChanged;EditorApplication.hierarchyWindowChanged += OnSceneChanged;}void OnDestroy(){SceneView.onSceneGUIDelegate -= OnSceneGUI;EditorApplication.hierarchyWindowChanged -= OnSceneChanged;}static void OnSceneChanged(){if( IsInCorrectLevel() == true ){Tools.hidden = LevelEditorE07ToolsMenu.SelectedTool != 0;}else{Tools.hidden = false;}}static void OnSceneGUI( SceneView sceneView ){if( IsInCorrectLevel() == false ){return;}DrawToolsMenu( sceneView.position );}static bool IsInCorrectLevel(){return UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().name == "GameE07"|| UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().name == "GameE08"|| UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().name == "GameE09";}static void DrawToolsMenu( Rect position ){// 通过使用Handles.BeginGUI()，我们可以开启绘制Scene视图的GUI元素Handles.BeginGUI();//Here we draw a toolbar at the bottom edge of the SceneView// 这里我们在Scene视图的底部绘制了一个工具条GUILayout.BeginArea( new Rect( 0, position.height - 35, position.width, 20 ), EditorStyles.toolbar );{string[] buttonLabels = new string[] { "None", "Erase", "Paint" };// GUILayout.SelectionGrid提供了一个按钮工具条// 通过把它的返回值存储在SelectedTool里可以让我们根据不同的按钮来实现不同的行为SelectedTool = GUILayout.SelectionGrid(SelectedTool, buttonLabels, 3,EditorStyles.toolbarButton,GUILayout.Width( 300 ) );}GUILayout.EndArea();Handles.EndGUI();}
}

场景八

关注点：

可以在场景七的基础上，点击相应按钮后增加或删除Cube

新的编辑器脚本逻辑和场景七类似，重点在于回调函数OnSceneGUI：

static void OnSceneGUI(SceneView sceneView)
{if (IsInCorrectLevel() == false){return;}if (LevelEditorE07ToolsMenu.SelectedTool == 0){return;}// 通过创建一个新的ControlID我们可以把鼠标输入的Scene视图反应权从Unity默认的行为中抢过来// FocusType.Passive意味着这个控制权不会接受键盘输入而只关心鼠标输入int controlId = GUIUtility.GetControlID(FocusType.Passive);// 如果是鼠标左键被点击同时没有其他特定按键按下的话if (Event.current.type == EventType.mouseDown &&Event.current.button == 0 &&Event.current.alt == false &&Event.current.shift == false &&Event.current.control == false){if (LevelEditorE06CubeHandle.IsMouseInValidArea == true){if (LevelEditorE07ToolsMenu.SelectedTool == 1){    // 如果选择的是erase按键（从场景七的静态变量SelectedTool判断得到），移除Cube          RemoveBlock(LevelEditorE06CubeHandle.CurrentHandlePosition);}if (LevelEditorE07ToolsMenu.SelectedTool == 2){/// 如果选择的是add按键（从场景七的静态变量SelectedTool判断得到），添加CubeAddBlock(LevelEditorE06CubeHandle.CurrentHandlePosition);}}}// 如果按下了Escape，我们就自动取消选择当前的按钮if (Event.current.type == EventType.keyDown &&Event.current.keyCode == KeyCode.Escape){LevelEditorE07ToolsMenu.SelectedTool = 0;}// 把我们自己的controlId添加到默认的control里，这样Unity就会选择我们的控制权而非Unity默认的Scene视图行为HandleUtility.AddDefaultControl(controlId);
}

场景九

关注点：

使用Scriptable Object把一些Prefab预览在Scene视图上

Scriptable Object是一个相当于自定义Assets对象的类。下面是LevelBlocks的定义。它包含了一个LevelBlockData的数组来存储可选的Prefab对象。

using UnityEngine;
using System.Collections;
using System.Collections.Generic;//[System.Serializable] tells unity to serialize this class if
//it's used in a public array or as a public variable in a component
[System.Serializable]
public class LevelBlockData
{public string Name;public GameObject Prefab;
}//[CreateAssetMenu] creates an entry in the default Create menu of the ProjectView so you can easily create an instance of this ScriptableObject
[CreateAssetMenu]
public class LevelBlocks : ScriptableObject
{//This ScriptableObject simply stores a list of blocks. It kind of acts like a database in that it stores rows of datapublic List<LevelBlockData> Blocks = new List<LevelBlockData>();
}

我们之后就可以在Hierency视图创建一个LevelBlock资源，Editor类则会加载这个资源来得到相应的数据。

static LevelEditorE09ScriptableObject()
{SceneView.onSceneGUIDelegate -= OnSceneGUI;SceneView.onSceneGUIDelegate += OnSceneGUI;//Make sure we load our block database. Notice the path here, which means the block database has to be in this specific location so we can find it//LoadAssetAtPath is a great way to load an asset from the projectm_LevelBlocks = AssetDatabase.LoadAssetAtPath<LevelBlocks>( "Assets/E09 - Scriptable Object/LevelBlocks.asset" );
}

Unite 2016上还有另一个专门讲Scriptable Object的视频，强烈建议看一下：

https://www.youtube.com/watch?v=VBA1QCoEAX4

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来自：candycat1992

http://blog.csdn.net/candycat1992/article/details/52067975

写在前面

场景一

场景二

场景三

场景四

场景五

场景六

场景七

场景八

场景九

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