[Solved]Using Popup Property Drawer for Enumerations with special symbols

I'm looking for a way to create enumerations with special symbols. And the easiest way I've found to create a list or Popup from Inspector has been: Property Drawers in Unity 4.

But, this code:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Example : MonoBehaviour {
5.  
6.     [Popup ("Warrior", "Mage", "Archer", "Ninja")]
7.     public string @class = "Warrior";
8.  
9. }

It throws the following errors:

I have installed 4.5.1f3 Unity version. Any solution?

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[SOLVED]

Enumeration class, type to define enumerations from items field:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Enumeration{
4.  
5.     public static readonly string[] items;
6.  
7. }
8.  
9. //Example 1
10. public class CameraResolutions : Enumeration{
11.  
12.     public static readonly new string[] items = new string[]{ "Free Aspect","5:4","4:3","3:2","16:10","16:9" };
13.  
14. }
15.  
16. //Example 2
17. public class Fraction4 : Enumeration{
18.  
19.     public static readonly new string[] items = new string[]{ "1\\4","2\\4","3\\4","4\\4" };
20.  
21. }

PropertyAttribute class, with class type and string params constructor:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Enum : PropertyAttribute{
4.  
5.     public readonly string[] items;
6.     public int selected = 0;
7.  
8.     public Enum(System.Type type){
9.  
10.         if (type.IsSubclassOf(typeof(Enumeration)))
11.         {
12.             System.Reflection.FieldInfo fieldInfo = type.GetField("items");
13.             this.items = (string[])fieldInfo.GetValue (null);
14.  
15.         } else {
16.  
17.             this.items = new string[]{"Assign Enumeration Type"};
18.  
19.         }  
20.  
21.     }
22.  
23.     public Enum(params string[] enumerations){ this.items = enumerations; }
24.  
25. }

PropertyDrawer class, in Editor folder, to create popup list:

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3.  
4. [CustomPropertyDrawer (typeof (Enum))]
5. public class EnumDrawer : PropertyDrawer {
6.  
7.     Enum enumeration{ get{ return (Enum)attribute; } }
8.  
9.     bool Start = true;
10.  
11.     public override void OnGUI (Rect position, SerializedProperty prop, GUIContent label) {
12.      
13.         if(Start){
14.          
15.             Start = false;
16.             for(int i=0;i<enumeration.items.Length;i++){
17.              
18.                 if(enumeration.items[i].Equals(prop.stringValue)){
19.                  
20.                     enumeration.selected = i;
21.                     break;
22.                  
23.                 }
24.              
25.             }
26.          
27.         }
28.      
29.         enumeration.selected = EditorGUI.Popup(EditorGUI.PrefixLabel(position, label),enumeration.selected,enumeration.items);
30.         prop.stringValue = enumeration.items[enumeration.selected];
31.      
32.     }
33.      
34. }

Script Test:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class EnumerationTest : MonoBehaviour {
4.  
5.     [Enum("Free Aspect","5:4","4:3","3:2","16:10","16:9")]
6.     public string cameraResolution = "3:2";
7.  
8.     [Enum("1\\4","2\\4","3\\4","4\\4")]
9.     public string fraction;
10.  
11.     [Enum(typeof(CameraResolutions))]
12.     public string camResolution;
13.  
14.     [Enum(typeof(Fraction4))]
15.     public string frac="4\\4";
16.  
17.  
18.     void Start(){
19.  
20.         Debug.Log(cameraResolution);
21.         Debug.Log(fraction);
22.         Debug.Log(camResolution);
23.         Debug.Log(frac);
24.  
25.     }
26.  
27. }

 

Popup is not a built-in attribute
you have to script it yourself
That page tells you how to create a regexAttribute, now go make a popupAttribute

 

Ok. I tested this code.

This is Enumeration class, PropertyAttribute derived:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Enumeration : PropertyAttribute {
4.    
5.     public readonly string[] items;
6.     public int selected = 0;
7.    
8.     public Enumeration(string[] enumerations){ this.items = enumerations; }
9.  
10. }

This is EnumerationDrawer class, PropertyDrawer derived:

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3.  
4. [CustomPropertyDrawer (typeof (Enumeration))]
5. public class EnumerationDrawer : PropertyDrawer {
6.  
7.     Enumeration enumeration{ get{ return (Enumeration)attribute; } }
8.  
9.     public override void OnGUI (Rect position, SerializedProperty prop, GUIContent label) {
10.  
11.         enumeration.selected = EditorGUI.Popup(EditorGUI.PrefixLabel(position, label),enumeration.selected,enumeration.items);
12.  
13.     }
14.  
15. }

And this is EnumerationTest:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class EnumerationTest : MonoBehaviour {
4.  
5.     [Enumeration(new string[]{ "Free Aspect","5:4","4:3","3:2","16:10","16:9" })]
6.     public string cameraResolution;
7.  
8.     [Enumeration(new string[]{ "1/4","2/4","3/4","4/4" })]
9.     public string fraction;
10.  
11.     void Start(){
12.  
13.         Debug.Log(cameraResolution);
14.         Debug.Log(fraction);
15.  
16.     }
17.  
18. }

Result this:



Questions:

1) How to write symbol /. The image show two panels or menus.
2) Debug.log considers the string variables as objects.
3) In example: Property Drawers in Unity 4, Popup attribute use indefined number of arguments, using comma-separated string.

 

1 Maybe use \\ for a slash, dont think there is an escape for a forward slash

2 Everything from Debug.log is an object. Your variables are strings

3 Change line 8 your constructor to use params like (can't test atm):

Code (CSharp):

1.     public Enumeration(params string[] enumerations){ this.items = enumerations; }

 

Thanks for advice.

I have changed / symbol by \\, and added 'params' to constructor.

To change string value, I returned to study the example, and I have seen the need to access the prop (SerializedProperty value) in PropertyDrawer OnGUI function.