本文实现一个音频库的自定义编辑器，效果如图：
开始实现之前，首先简单介绍该音频库模块，音频库类Audio Database继承自Scriptable Object类，是一个可配置的资源文件：
包含的内容如下，databaseName表示该音频库的名称，outputAudioMixerGroup表示音频播放时的输出混音器组，datasets则是表示所有音频数据的列表：
代码语言：javascript复制/// <summary>
/// 音频库
/// </summary>
[CreateAssetMenu(fileName = "New Audio Database", order = 215)]
public class AudioDatabase : ScriptableObject
{
/// <summary>
/// 音频库名称
/// </summary>
public string databaseName;
/// <summary>
/// 输出混音器组
/// </summary>
public AudioMixerGroup outputAudioMixerGroup;
/// <summary>
/// 音频数据列表
/// </summary>
public List<AudioData> datasets = new List<AudioData>(0);
}AudioData音频数据类包含两个字段：name 表示该音频数据的名称，clip 表示该音频资源：
代码语言：javascript复制using System;
using UnityEngine;
namespace SK.Framework
{
/// <summary>
/// 音频数据
/// </summary>
[Serializable]
public class AudioData
{
public string name;
public AudioClip clip;
}
}该编辑器的布局结构：
首先继承自Editor类，使用CustomEditorAttribute，并重写OnInspectorGUI方法以实现自定义编辑器。
音频库名称是一个string类型字段，因此使用EditorGUILayout中的TextField函数来添加一个文本编辑框：
代码语言：javascript复制using UnityEditor;
using UnityEngine;
[CustomEditor(typeof(AudioDatabase))]
public class AudioDatabaseEditor : Editor
{
private AudioDatabase database;
private void OnEnable()
{
database = target as AudioDatabase;
}
public override void OnInspectorGUI()
{
//音频库名称
var newDatabaseName = EditorGUILayout.TextField("Database Name", database.databaseName);
if (newDatabaseName != database.databaseName)
{
Undo.RecordObject(database, "Name");
database.databaseName = newDatabaseName;
EditorUtility.SetDirty(database);
}
}
}其中Undo.RecordObject方法用于实现撤销、恢复操作。即当我们修改音频库名称后，使用Ctrl Z可以撤销修改的操作，撤销后使用Ctrl Y可以恢复撤销的内容。EditorUtility类中的SetDirty方法则用于标识该物体已经被修改，以实现资产更新保存。上述这两个方法将会大量用到。
outputAudioMixerGroup使用ObjectField方法来实现赋值和更改，objType参数传入AudioMixerGroup的类型即可：
代码语言：javascript复制var newOutputAudioMixerGroup = EditorGUILayout.ObjectField("Output Audio Mixer Group", database.outputAudioMixerGroup, typeof(AudioMixerGroup), false) as AudioMixerGroup;
if (newOutputAudioMixerGroup != database.outputAudioMixerGroup)
{
Undo.RecordObject(database, "Output");
database.outputAudioMixerGroup = newOutputAudioMixerGroup;
EditorUtility.SetDirty(database);
}折叠栏使用EditorGUILayout类中的BeginFadeGroup和EndFadeGroup方法来实现，可以使用一个bool类型字段来实现简单的折叠，不过我们这里用的是AnimBool，它可以实现折叠时的动画效果，效果如下：（AnimBool的使用在以往的文章中有介绍：十三、编辑器开发之AnimBool）
在折叠栏为打开状态时，遍历音频数据列表，每一项数据添加一个水平布局，从左到右依次添加音频图标、音频名称、一个Button按钮、时长信息、播放、停止、删除按钮。
代码语言：javascript复制using UnityEngine;
using UnityEditor;
using UnityEngine.Audio;
using UnityEditor.AnimatedValues;
[CustomEditor(typeof(AudioDatabase))]
public class AudioDatabaseEditor : Editor
{
private AudioDatabase database;
private AnimBool foldout;
private void OnEnable()
{
database = target as AudioDatabase;
foldout = new AnimBool(false, Repaint);
}
public override void OnInspectorGUI()
{
//音频库名称
var newDatabaseName = EditorGUILayout.TextField("Database Name", database.databaseName);
if (newDatabaseName != database.databaseName)
{
Undo.RecordObject(database, "Name");
database.databaseName = newDatabaseName;
EditorUtility.SetDirty(database);
}
//音频库输出混音器
var newOutputAudioMixerGroup = EditorGUILayout.ObjectField("Output Audio Mixer Group", database.outputAudioMixerGroup, typeof(AudioMixerGroup), false) as AudioMixerGroup;
if (newOutputAudioMixerGroup != database.outputAudioMixerGroup)
{
Undo.RecordObject(database, "Output");
database.outputAudioMixerGroup = newOutputAudioMixerGroup;
EditorUtility.SetDirty(database);
}
//音频数据折叠栏 使用AnimBool实现动画效果
foldout.target = EditorGUILayout.Foldout(foldout.target, "Datasets");
if (EditorGUILayout.BeginFadeGroup(foldout.faded))
{
for (int i = 0; i < database.datasets.Count; i )
{
var data = database.datasets[i];
//水平布局
GUILayout.BeginHorizontal();
GUILayout.EndHorizontal();
}
}
EditorGUILayout.EndFadeGroup();
}
}音频图标使用的是Unity中内置的图标，如何查看Unity中的内置图标在以往的文章中有介绍：六、编辑器开发之GUIIcon 有了图标的名称后，通过EditorGUIUtility类中的IconContent方法进行实现：
代码语言：javascript复制//绘制音频图标
GUILayout.Label(EditorGUIUtility.IconContent("SceneViewAudio"), GUILayout.Width(20f));音频数据的名称为string类型字段，也通过TextField进行实现：
代码语言：javascript复制//音频数据名称
var newName = EditorGUILayout.TextField(data.name, GUILayout.Width(120f));
if (newName != data.name)
{
Undo.RecordObject(database, "Data Name");
data.name = newName;
EditorUtility.SetDirty(database);
}添加Button按钮，点击该按钮后，使用EditorGUIUtility类中的PingObject方法定位该项数据中的音频资源，绘制按钮时使用不同颜色来区分当前项是否为选中的音频数据项，声明一个int类型字段currentIndex，用于表示当前选中项的索引值
代码语言：javascript复制//使用音频名称绘制Button按钮 点击后使用PingObject方法定位该音频资源
Color colorCache = GUI.color;
GUI.color = currentIndex == i ? Color.cyan : colorCache;
if (GUILayout.Button(data.clip != null ? data.clip.name : "Null"))
{
currentIndex = i;
EditorGUIUtility.PingObject(data.clip);
}
GUI.color = colorCache;
播放进度和音频时长均为float类型，我们需要一个将时长转化为00:00时间格式的方法，代码如下：
代码语言：javascript复制//将秒数转换为00：00时间格式字符串
private string ToTimeFormat(float time)
{
int seconds = (int)time;
int minutes = seconds / 60;
seconds %= 60;
return string.Format("{0:D2}:{1:D2}", minutes, seconds);
}播放、停止播放及删除按钮的图标用的也均是Unity中的内置图标，分别为PlayButton、PauseButton和Toolbar Minus：
代码语言：javascript复制//播放按钮
if (GUILayout.Button(EditorGUIUtility.IconContent("PlayButton"), GUILayout.Width(20f)))
{
}
//停止播放按钮
if (GUILayout.Button(EditorGUIUtility.IconContent("PauseButton"), GUILayout.Width(20f)))
{
}
//删除按钮 点击后删除该项音频数据
if (GUILayout.Button(EditorGUIUtility.IconContent("Toolbar Minus"), GUILayout.Width(20f)))
{
}我们声明一个字典来存储当前正在播放的音频项，点击播放按钮时，创建一个带有Audio Source组件的物体并用其播放，将其添加到字典中，点击停止播放按钮时，将其从字典移除，并销毁物体，点击删除按钮时，也要判断该项如果正在播放，先要进行移除和销毁，再删除该音频数据项：
代码语言：javascript复制private Dictionary<AudioData, AudioSource> players;//播放按钮
if (GUILayout.Button(EditorGUIUtility.IconContent("PlayButton"), GUILayout.Width(20f)))
{
if (!players.ContainsKey(data))
{
//创建一个物体并添加AudioSource组件
var source = EditorUtility.CreateGameObjectWithHideFlags("Audio Player", HideFlags.HideAndDontSave).AddComponent<AudioSource>();
source.clip = data.clip;
source.outputAudioMixerGroup = database.outputAudioMixerGroup;
source.Play();
players.Add(data, source);
}
}
//停止播放按钮
if (GUILayout.Button(EditorGUIUtility.IconContent("PauseButton"), GUILayout.Width(20f)))
{
if (players.ContainsKey(data))
{
DestroyImmediate(players[data].gameObject);
players.Remove(data);
}
}
//删除按钮 点击后删除该项音频数据
if (GUILayout.Button(EditorGUIUtility.IconContent("Toolbar Minus"), GUILayout.Width(20f)))
{
Undo.RecordObject(database, "Delete");
database.datasets.Remove(data);
if (players.ContainsKey(data))
{
DestroyImmediate(players[data].gameObject);
players.Remove(data);
}
EditorUtility.SetDirty(database);
Repaint();
}
最后绘制一个矩形区域，当拖拽AudioClip资源到该区域时，添加音频数据项，使用DragAndDrop类来实现：
代码语言：javascript复制//以下代码块中绘制了一个矩形区域，将AudioClip资产拖到该区域则添加一项音频数据
GUILayout.BeginHorizontal();
{
GUILayout.Label(GUIContent.none, GUILayout.ExpandWidth(true));
Rect lastRect = GUILayoutUtility.GetLastRect();
var dropRect = new Rect(lastRect.x 2f, lastRect.y - 2f, 120f, 20f);
bool containsMouse = dropRect.Contains(Event.current.mousePosition);
if (containsMouse)
{
switch (Event.current.type)
{
case EventType.DragUpdated:
bool containsAudioClip = DragAndDrop.objectReferences.OfType<AudioClip>().Any();
DragAndDrop.visualMode = containsAudioClip ? DragAndDropVisualMode.Copy : DragAndDropVisualMode.Rejected;
Event.current.Use();
Repaint();
break;
case EventType.DragPerform:
IEnumerable<AudioClip> audioClips = DragAndDrop.objectReferences.OfType<AudioClip>();
foreach (var audioClip in audioClips)
{
if (database.datasets.Find(m => m.clip == audioClip) == null)
{
Undo.RecordObject(database, "Add");
database.datasets.Add(new AudioData() { name = audioClip.name, clip = audioClip });
EditorUtility.SetDirty(database);
}
}
Event.current.Use();
Repaint();
break;
}
}
Color color = GUI.color;
GUI.color = new Color(GUI.color.r, GUI.color.g, GUI.color.b, containsMouse ? .9f : .5f);
GUI.Box(dropRect, "Drop AudioClips Here", new GUIStyle(GUI.skin.box) { fontSize = 10 });
GUI.color = color;
}
GUILayout.EndHorizontal();
最终代码：
代码语言：javascript复制using UnityEngine;
using UnityEditor;
using System.Linq;
using UnityEngine.Audio;
using System.Collections.Generic;
using UnityEditor.AnimatedValues;
[CustomEditor(typeof(AudioDatabase))]
public class AudioDatabaseEditor : Editor
{
private AudioDatabase database;
private AnimBool foldout;
private int currentIndex = -1;
private Dictionary<AudioData, AudioSource> players;
private void OnEnable()
{
database = target as AudioDatabase;
foldout = new AnimBool(false, Repaint);
players = new Dictionary<AudioData, AudioSource>();
EditorApplication.update = Update;
}
private void OnDestroy()
{
EditorApplication.update -= Update;
foreach (var player in players)
{
DestroyImmediate(player.Value.gameObject);
}
players.Clear();
}
private void Update()
{
Repaint();
foreach (var player in players)
{
if (!player.Value.isPlaying)
{
DestroyImmediate(player.Value.gameObject);
players.Remove(player.Key);
break;
}
}
}
public override void OnInspectorGUI()
{
//音频库名称
var newDatabaseName = EditorGUILayout.TextField("Database Name", database.databaseName);
if (newDatabaseName != database.databaseName)
{
Undo.RecordObject(database, "Name");
database.databaseName = newDatabaseName;
EditorUtility.SetDirty(database);
}
//音频库输出混音器
var newOutputAudioMixerGroup = EditorGUILayout.ObjectField("Output Audio Mixer Group", database.outputAudioMixerGroup, typeof(AudioMixerGroup), false) as AudioMixerGroup;
if (newOutputAudioMixerGroup != database.outputAudioMixerGroup)
{
Undo.RecordObject(database, "Output");
database.outputAudioMixerGroup = newOutputAudioMixerGroup;
EditorUtility.SetDirty(database);
}
//音频数据折叠栏 使用AnimBool实现动画效果
foldout.target = EditorGUILayout.Foldout(foldout.target, "Datasets");
if (EditorGUILayout.BeginFadeGroup(foldout.faded))
{
for (int i = 0; i < database.datasets.Count; i )
{
var data = database.datasets[i];
GUILayout.BeginHorizontal();
//绘制音频图标
GUILayout.Label(EditorGUIUtility.IconContent("SceneViewAudio"), GUILayout.Width(20f));
//音频数据名称
var newName = EditorGUILayout.TextField(data.name, GUILayout.Width(120f));
if (newName != data.name)
{
Undo.RecordObject(database, "Data Name");
data.name = newName;
EditorUtility.SetDirty(database);
}
//使用音频名称绘制Button按钮 点击后使用PingObject方法定位该音频资源
Color colorCache = GUI.color;
GUI.color = currentIndex == i ? Color.cyan : colorCache;
if (GUILayout.Button(data.clip != null ? data.clip.name : "Null"))
{
currentIndex = i;
EditorGUIUtility.PingObject(data.clip);
}
GUI.color = colorCache;
//若该音频正在播放 计算其播放进度
string progress = players.ContainsKey(data) ? ToTimeFormat(players[data].time) : "00:00";
GUI.color = new Color(GUI.color.r, GUI.color.g, GUI.color.b, players.ContainsKey(data) ? .9f : .5f);
//显示信息：播放进度 / 音频时长 (00:00 / 00:00)
GUILayout.Label($"({progress} / {(data.clip != null ? ToTimeFormat(data.clip.length) : "00:00")})",
new GUIStyle(GUI.skin.label) { alignment = TextAnchor.LowerRight, fontSize = 8, fontStyle = FontStyle.Italic }, GUILayout.Width(60f));
GUI.color = colorCache;
//播放按钮
if (GUILayout.Button(EditorGUIUtility.IconContent("PlayButton"), GUILayout.Width(20f)))
{
if (!players.ContainsKey(data))
{
//创建一个物体并添加AudioSource组件
var source = EditorUtility.CreateGameObjectWithHideFlags("Audio Player", HideFlags.HideAndDontSave).AddComponent<AudioSource>();
source.clip = data.clip;
source.outputAudioMixerGroup = database.outputAudioMixerGroup;
source.Play();
players.Add(data, source);
}
}
//停止播放按钮
if (GUILayout.Button(EditorGUIUtility.IconContent("PauseButton"), GUILayout.Width(20f)))
{
if (players.ContainsKey(data))
{
DestroyImmediate(players[data].gameObject);
players.Remove(data);
}
}
//删除按钮 点击后删除该项音频数据
if (GUILayout.Button(EditorGUIUtility.IconContent("Toolbar Minus"), GUILayout.Width(20f)))
{
Undo.RecordObject(database, "Delete");
database.datasets.Remove(data);
if (players.ContainsKey(data))
{
DestroyImmediate(players[data].gameObject);
players.Remove(data);
}
EditorUtility.SetDirty(database);
Repaint();
}
GUILayout.EndHorizontal();
}
EditorGUILayout.Space();
//以下代码块中绘制了一个矩形区域，将AudioClip资产拖到该区域则添加一项音频数据
GUILayout.BeginHorizontal();
{
GUILayout.Label(GUIContent.none, GUILayout.ExpandWidth(true));
Rect lastRect = GUILayoutUtility.GetLastRect();
var dropRect = new Rect(lastRect.x 2f, lastRect.y - 2f, 120f, 20f);
bool containsMouse = dropRect.Contains(Event.current.mousePosition);
if (containsMouse)
{
switch (Event.current.type)
{
case EventType.DragUpdated:
bool containsAudioClip = DragAndDrop.objectReferences.OfType<AudioClip>().Any();
DragAndDrop.visualMode = containsAudioClip ? DragAndDropVisualMode.Copy : DragAndDropVisualMode.Rejected;
Event.current.Use();
Repaint();
break;
case EventType.DragPerform:
IEnumerable<AudioClip> audioClips = DragAndDrop.objectReferences.OfType<AudioClip>();
foreach (var audioClip in audioClips)
{
if (database.datasets.Find(m => m.clip == audioClip) == null)
{
Undo.RecordObject(database, "Add");
database.datasets.Add(new AudioData() { name = audioClip.name, clip = audioClip });
EditorUtility.SetDirty(database);
}
}
Event.current.Use();
Repaint();
break;
}
}
Color color = GUI.color;
GUI.color = new Color(GUI.color.r, GUI.color.g, GUI.color.b, containsMouse ? .9f : .5f);
GUI.Box(dropRect, "Drop AudioClips Here", new GUIStyle(GUI.skin.box) { fontSize = 10 });
GUI.color = color;
}
GUILayout.EndHorizontal();
}
EditorGUILayout.EndFadeGroup();
serializedObject.ApplyModifiedProperties();
}
//将秒数转换为00：00时间格式字符串
private string ToTimeFormat(float time)
{
int seconds = (int)time;
int minutes = seconds / 60;
seconds %= 60;
return string.Format("{0:D2}:{1:D2}", minutes, seconds);
}
}
