大家好，又见面了，我是你们的朋友全栈君。
Value Dropdown Attribute特性用于任何属性，并使用可配置选项创建下拉列表。使用此选项可为用户提供一组特定的选项供您选择。
也就是创建一些特殊的下拉条
这个里面的属性就有点多了，达到了16个！！！
下面笔者逐个讲解
MemberName,也是唯一一个有参构造函数需要的属性，有两种形式的Drop下拉条，一种是直接数值的，另一种是Key-Value形式的
/*【MemberName】*/
[PropertySpace(40, 0)]
[ValueDropdown("TextureSizes")]
public int SomeSize1;
private static int[] TextureSizes = new int[] { 32, 64, 128, 256, 512, 1024, 2048, 4096 };
[ValueDropdown("FriendlyTextureSizes")]
public int SomeSize2;
private static IEnumerable FriendlyTextureSizes = new ValueDropdownList<int>()
{
{ "Small", 256 },
{ "Medium", 512 },
{ "Large", 1024 },
};
【SortDropdownItems】默认为false 开启后为下拉列表为根据Key升序排序
/*【SortDropdownItems】默认为false 开启后为下拉列表为根据Key升序排序*/
[PropertySpace(40, 0)]
[ValueDropdown("SortList1")]
public int SomeSize3;
private IEnumerable SortList1 = new ValueDropdownList<int>()
{
{ "Small", 256 },
{ "Medium", 512 },
{ "Large", 1024 },
{ "A", 128 },
};
[PropertySpace(0, 40)]
[ValueDropdown("SortList2", SortDropdownItems = true)]
public int SomeSize4;
private List<ValueDropdownItem<int>> SortList2 = new ValueDropdownList<int>()
{
{ "Small", 256 },
{ "Medium", 512 },
{ "Large", 1024 },
{ "A", 128 },
};
【DropdownTitle】给下来条提供一个标题
[PropertySpace(0, 40)]
[ValueDropdown("TextureSizes", DropdownTitle = "下拉条标题")]
public int SomeSize5;
【DropdownHeight】下拉条高度
/*【DropdownHeight】下拉条高度*/
[PropertySpace(0, 40)]
[ValueDropdown("TextureSizes", DropdownHeight = 80)]
public int SomeSize6;
【DropdownWidth】下拉条的宽度
/*【DropdownWidth】下拉条的宽度*/
[PropertySpace(0, 40)]
[ValueDropdown("TextureSizes", DropdownWidth = 100)]
public int SomeSize7;
【FlattenTreeView】是否使用平铺的树形视图
/*【FlattenTreeView】是否使用平铺的树形视图*/
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", FlattenTreeView = true)]//默认为false，如果设置为true则禁用树形结构使用平铺模式
public int SomeSize8;
【DoubleClickToConfirm】需要双击才能确地选中的内容
/*【DoubleClickToConfirm】需要双击才能确地选中的内容*/
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", DoubleClickToConfirm = true)]//需要双击才能选中
public int SomeSize9;
【HideChildProperties】是否隐藏此类型所含有的属性信息
/*【HideChildProperties】是否隐藏此类型所含有的属性信息*/
[ValueDropdown("RangVector3", HideChildProperties = true)]//
public Vector3 vector3HideChildProperties;
[PropertySpace(0, 40)]
[ValueDropdown("RangVector3", HideChildProperties = false)]//
public Vector3 vector3ShowChildProperties;
public IEnumerable<Vector3> RangVector3()
{
return Enumerable.Range(0, 10).Select(i => new Vector3(i, i, i));
}
【AppendNextDrawer】下拉条变成一个小的选择器，代替原有的宽型下拉条
/*【AppendNextDrawer】下拉条变成一个小的选择器，代替原有的宽型下拉条*/
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", AppendNextDrawer = true)]//
public int SomeSize11;
【DisableGUIInAppendedDrawer】配合AppendNextDrawer使用，显示的数值为灰度状态，达到不可更改数值的目的
/*【DisableGUIInAppendedDrawer】配合AppendNextDrawer使用，显示的数值为灰度状态，达到不可更改数值的目的*/
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", AppendNextDrawer = true, DisableGUIInAppendedDrawer = true)]//
public int SomeSize12;
ExpandAllMenuItems】下拉条里面的条目是否全部展开
/*【ExpandAllMenuItems】下拉条里面的条目是否全部展开*/
[ValueDropdown("TreeViewOfInts" , ExpandAllMenuItems = false)]//
public int SomeSize13;
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", ExpandAllMenuItems =true )]//
public int SomeSize14;
【IsUniqueList】在添加的列表Item前面添加勾选框，可以一次性勾选多个Item并添加
/*【IsUniqueList】在添加的列表Item前面添加勾选框，可以一次性勾选多个Item并添加*/
[ValueDropdown("GetAllSceneObjects", IsUniqueList = false)]
public List<GameObject> UniqueGameobjectList0;
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", IsUniqueList = true)]
public List<GameObject> UniqueGameobjectList1;
【ExcludeExistingValuesInList】添加列中不会显示已经选中的Item
/*【ExcludeExistingValuesInList】添加列中不会显示已经选中的Item*/
[ValueDropdown("GetAllSceneObjects")]
public List<GameObject> UniqueGameobjectList2;
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", ExcludeExistingValuesInList = true)]
public List<GameObject> UniqueGameobjectList3;
【DisableListAddButtonBehaviour】禁用下拉列表，以弹窗的形式弹出
/*【DisableListAddButtonBehaviour】禁用下拉列表，以弹窗的形式弹出*/
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", DisableListAddButtonBehaviour = true, IsUniqueList = true)]
public List<GameObject> UniqueGameobjectList4;
【DrawDropdownForListElements】已经添加的Item不会再出现Item下拉表
/*【DrawDropdownForListElements】已经添加的Item不会再出现Item下拉表*/
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", DrawDropdownForListElements = false)]
public List<GameObject> UniqueGameobjectList5;
``
##### 【NumberOfItemsBeforeEnablingSearch】查过指定数量的Item则出现搜索框。默认是10。
```cs
/*【NumberOfItemsBeforeEnablingSearch】查过指定数量的Item则出现搜索框。默认是10。*/
[ValueDropdown("GetAllSceneObjects", NumberOfItemsBeforeEnablingSearch =200)]
public List<GameObject> UniqueGameobjectList6;
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", NumberOfItemsBeforeEnablingSearch = 20)]
public List<GameObject> UniqueGameobjectList7;
示例完整代码（含有一些其他辅助性功能代码）
using Sirenix.OdinInspector;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
public class ValueDropdownAttributeExample : MonoBehaviour
{
/*【MemberName】*/
[PropertySpace(40, 0)]
[ValueDropdown("TextureSizes")]
public int SomeSize1;
private static int[] TextureSizes = new int[] { 32, 64, 128, 256, 512, 1024, 2048, 4096 };
[ValueDropdown("FriendlyTextureSizes")]
public int SomeSize2;
private static IEnumerable FriendlyTextureSizes = new ValueDropdownList<int>()
{
{ "Small", 256 },
{ "Medium", 512 },
{ "Large", 1024 },
};
/*【SortDropdownItems】默认为false 开启后为下拉列表为根据Key升序排序*/
[PropertySpace(40, 0)]
[ValueDropdown("SortList1")]
public int SomeSize3;
private IEnumerable SortList1 = new ValueDropdownList<int>()
{
{ "Small", 256 },
{ "Medium", 512 },
{ "Large", 1024 },
{ "A", 128 },
};
[PropertySpace(0, 40)]
[ValueDropdown("SortList2", SortDropdownItems = true)]
public int SomeSize4;
private List<ValueDropdownItem<int>> SortList2 = new ValueDropdownList<int>()
{
{ "Small", 256 },
{ "Medium", 512 },
{ "Large", 1024 },
{ "A", 128 },
};
/*【DropdownTitle】给下来条提供一个标题*/
[PropertySpace(0, 40)]
[ValueDropdown("TextureSizes", DropdownTitle = "下拉条标题")]
public int SomeSize5;
/*【DropdownHeight】下拉条高度*/
[PropertySpace(0, 40)]
[ValueDropdown("TextureSizes", DropdownHeight = 80)]
public int SomeSize6;
/*【DropdownWidth】下拉条的宽度*/
[PropertySpace(0, 40)]
[ValueDropdown("TextureSizes", DropdownWidth = 100)]
public int SomeSize7;
/*【FlattenTreeView】是否使用平铺的树形视图*/
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", FlattenTreeView = true)]//默认为false，如果设置为true则禁用树形结构使用平铺模式
public int SomeSize8;
/*【DoubleClickToConfirm】需要双击才能确地选中的内容*/
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", DoubleClickToConfirm = true)]//需要双击才能选中
public int SomeSize9;
/*【HideChildProperties】是否隐藏此类型所含有的属性信息*/
[ValueDropdown("RangVector3", HideChildProperties = true)]//
public Vector3 vector3HideChildProperties;
[PropertySpace(0, 40)]
[ValueDropdown("RangVector3", HideChildProperties = false)]//
public Vector3 vector3ShowChildProperties;
public IEnumerable<Vector3> RangVector3()
{
return Enumerable.Range(0, 10).Select(i => new Vector3(i, i, i));
}
/*【AppendNextDrawer】下拉条变成一个小的选择器，代替原有的宽型下拉条*/
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", AppendNextDrawer = true)]//
public int SomeSize11;
/*【DisableGUIInAppendedDrawer】配合AppendNextDrawer使用，显示的数值为灰度状态，达到不可更改数值的目的*/
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", AppendNextDrawer = true, DisableGUIInAppendedDrawer = true)]//
public int SomeSize12;
/*【ExpandAllMenuItems】下拉条里面的条目是否全部展开*/
[ValueDropdown("TreeViewOfInts" , ExpandAllMenuItems = false)]//
public int SomeSize13;
[PropertySpace(0, 40)]
[ValueDropdown("TreeViewOfInts", ExpandAllMenuItems =true )]//
public int SomeSize14;
/*【IsUniqueList】在添加的列表Item前面添加勾选框，可以一次性勾选多个Item并添加*/
[ValueDropdown("GetAllSceneObjects", IsUniqueList = false)]
public List<GameObject> UniqueGameobjectList0;
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", IsUniqueList = true)]
public List<GameObject> UniqueGameobjectList1;
/*【ExcludeExistingValuesInList】添加列中不会显示已经选中的Item*/
[ValueDropdown("GetAllSceneObjects")]
public List<GameObject> UniqueGameobjectList2;
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", ExcludeExistingValuesInList = true)]
public List<GameObject> UniqueGameobjectList3;
/*【DisableListAddButtonBehaviour】禁用下拉列表，以弹窗的形式弹出*/
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", DisableListAddButtonBehaviour = true, IsUniqueList = true)]
public List<GameObject> UniqueGameobjectList4;
/*【DrawDropdownForListElements】已经添加的Item不会再出现Item下拉表*/
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", DrawDropdownForListElements = false)]
public List<GameObject> UniqueGameobjectList5;
/*【NumberOfItemsBeforeEnablingSearch】查过指定数量的Item则出现搜索框。默认是10。*/
[ValueDropdown("GetAllSceneObjects", NumberOfItemsBeforeEnablingSearch =200)]
public List<GameObject> UniqueGameobjectList6;
[PropertySpace(0, 40)]
[ValueDropdown("GetAllSceneObjects", NumberOfItemsBeforeEnablingSearch = 20)]
public List<GameObject> UniqueGameobjectList7;
[ValueDropdown("GetListOfMonoBehaviours", AppendNextDrawer = true, HideChildProperties = false)]
public MonoBehaviour SomeMonoBehaviour;
private IEnumerable<MonoBehaviour> GetListOfMonoBehaviours()
{
return GameObject.FindObjectsOfType<MonoBehaviour>();
}
[ValueDropdown("KeyCodes")]
public KeyCode FilteredEnum;
private static IEnumerable<KeyCode> KeyCodes = Enumerable.Range((int)KeyCode.Alpha0, 10).Cast<KeyCode>();
[ValueDropdown("TreeViewOfInts", ExpandAllMenuItems = true)]
public List<int> IntTreeview = new List<int>() { 1, 2, 7 };
/// <summary>
/// 以“/”符号作为类别分隔符
/// </summary>
private IEnumerable TreeViewOfInts = new ValueDropdownList<int>()
{
{ "Node 1/Node 1.1", 1 },
{ "Node 1/Node 1.2", 2 },
{ "Node 2/Node 2.1", 3 },
{ "Node 3/Node 3.1", 4 },
{ "Node 3/Node 3.2", 5 },
{ "Node 1/Node 3.1/Node 3.1.1", 6 },
{ "Node 1/Node 3.1/Node 3.1.2", 7 },
{ "Node 1", -1 },
{ "Node 2", -2 },
{ "Node 3", -3 },
{ "Node 4", -4 },
};
/// <summary>
/// IsUniqueList为true 每个Item上面有一个勾选框
/// </summary>
[ValueDropdown("GetAllSceneObjects", IsUniqueList = true, HideChildProperties = false)]
public List<GameObject> UniqueGameobjectList;
private static IEnumerable GetAllSceneObjects()
{
Func<Transform, string> getPath = null;
getPath = x => (x ? getPath(x.parent) + "/" + x.gameObject.name : "");//三元运算符 其中X为Transform
return GameObject.FindObjectsOfType<GameObject>().Select(x => new ValueDropdownItem(getPath(x.transform), x));
}
/// <summary>
/// ExcludeExistingValuesInList 为 ture则选中的item不在出现在等待选择的列下拉表中
/// DrawDropdownForListElements 为 true 每个item都有一个下拉列表
/// </summary>
[ValueDropdown("GetAllSceneObjects", IsUniqueList = false, DropdownTitle = "Select Scene Object", DrawDropdownForListElements = false, ExcludeExistingValuesInList = true)]
public List<GameObject> UniqueGameobjectListMode2;
private static IEnumerable GetAllScriptableObjects()
{
return UnityEditor.AssetDatabase.FindAssets("t:ScriptableObject")
.Select(x => UnityEditor.AssetDatabase.GUIDToAssetPath(x))
.Select(x => new ValueDropdownItem(x, UnityEditor.AssetDatabase.LoadAssetAtPath<ScriptableObject>(x)));
}
private static IEnumerable GetAllSirenixAssets()
{
var root = "Assets/Plugins/Sirenix/";
return UnityEditor.AssetDatabase.GetAllAssetPaths()
.Where(x => x.StartsWith(root))
.Select(x => x.Substring(root.Length))
.Select(x => new ValueDropdownItem(x, UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(root + x)));
}
}
更多教程内容详见：革命性Unity 编辑器扩展工具 — Odin Inspector 系列教程
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