Multiple Attributes

Is it possible to know if a variable has multiple attributes, and what they are, from the drawer?


--

Case:
I have an attribute called ReadOnly, This attribute disallows editing in the inspector.
example code: http://answers.unity3d.com/questions/489942/how-to-make-a-readonly-property-in-inspector.html

However, using ReadOnly on a variable which also uses the Range(...) attribute does not work. What happens is the variable is rendered in the inspector like a normal (read only) float and not like a Range attributed float.

I would like to know what attributes are currently on the variable I am drawing (in the property drawer) so I can deal with them accordingly.

 

Your question isn't very clear, but if you are asking about a serialized object, you can use serializedObject.isEditingMultipleObjects

http://docs.unity3d.com/ScriptReference/SerializedObject-isEditingMultipleObjects.html

 

you can do this with reflection:

Code (CSharp):

1. using System.Reflection;
2. ...
3.  
4. FieldInfo[] fields = this.GetType ().GetFields (BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
5. foreach (FieldInfo field in fields) {
6.     object[] attributes = field.GetCustomAttributes (true);
7. }

 

Thanks for the reply, However, im not sure if you are barking up the wrong tree, or maybe I don't understand how to use that code.

I Tried, to use your code, in my attribute's drawer, and discovered that the fields it got was the fields in that class. I don't want this, I want to get the field that the property is being drawn from and check it's attribute.

This is the case I want to do this, ill update the OP as well.

I have an attribute called ReadOnly, This attribute disallows editing in the inspector.
example code: http://answers.unity3d.com/questions/489942/how-to-make-a-readonly-property-in-inspector.html

However, using ReadOnly on a variable which also uses the Range(...) attribute does not work. What happens is the variable is rendered in the inspector like a normal (read only) float and not like a Range attributed float.

I would like to know what attributes are currently on the variable I am drawing (in the property drawer) so I can deal with them accordingly.

Thanks

 

Hello I am having the same problem. Were you ever able to solve this issue?

Thank you!

 

@MaximusLitvinov The problem here is that you can't have 2 different PropertyDrawers for the same field. Unity will only use the first PropertyDrawer and ignore all others.

 

From a `SerializedProperty`, you can find the associated `FieldInfo` ( http://answers.unity.com/answers/1347452/view.html ) then use `GetCustomAttributes` or `GetCustomAttribue<YourAttribute>` if you're only looking for a specific one.

If it doesn't return null, you know this other attribute is there too and you can call its drawer's GUI.

Code (CSharp):

1. public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
2. {
3.     // Do stuff before and/or after this if desired
4.     if(HasAttr<MyAttr>(property))
5.          new MyDrawer().OnGUI(position, property, label);
6. }
7.  
8. private static bool HasAttr<T>(SerializedProperty property) where T: Attribute
9. {
10.     // Inspired by http://answers.unity.com/answers/1347452/view.html
11.     // and https://forum.unity.com/threads/multiple-attributes.387515/#post-2566777
12.     Type parentType = property.serializedObject.targetObject.GetType();
13.     FieldInfo fi = parentType.GetField(property.propertyPath, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
14.     // fi is sometimes null for reasons I ignore but it still seems to work
15.     return fi?.GetCustomAttribute<T>() != null;
16. }

@TrickyHandz You can if you call one GUI from the other.