Unity編輯器案列
- 2019 年 12 月 2 日
- 筆記
【Unity】编辑器小教程
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：
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Undo Undo.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>(); ....
2. 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; }.
3. 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 array void 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。 4. 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 info EditorGUIHelper.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 modification Undo.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(); 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 info EditorGUIHelper.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 modification Undo.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States m_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Handle UpdateRepaint(); 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 scenes static 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handle bool 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 scene if( 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 selected public 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 stuff Tools.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 stuff Tools.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Cube AddBlock(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 data public 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 project m_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：
