Property Drawer "No GUI implemented" error in Editor

Question

I am reading all the documentation in order and I just found that I am having issues to recreate a Property Drawer example.

After some research, I found this post that ended up being more clear than the documentation itself (despite being the same example): http://forum.unity3d.com/threads/how-do-property-drawer.197228/

I manage to make it compile, but not to work. So I am not sure where it fails, because the code seems to be up and running. Google didn't told me anything useful.

Any idea?

alt text

Thanks in advance.

Edit1:

  // Assets/Scripts/Range/RangeAttribute.cs
 // Assets/Scripts/Editor/RangeDrawerEditor.cs
 // Assets/Scripts/Range/CustomBehaviour.cs

The only diference with the example, is that the 2 non-editor scripts are in a folder called "range". I'm new to this "Property Drawer" thing, and if Im not able to see the example to really see what can offer, I doubt that I will use it on my own code. The documentation examples look unfinished in that part.

Answer 1

Answer by nschrag · Sep 18, 2014 at 04:08 PM

There is in error in the C# documentation for PropertyDrawer. OnGUI needs to be a public override method.

 public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
     // GUI Implementation
 }

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nschrag · Sep 18, 2014 at 04:15 PM -1

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Reported as bug 634200

Answer 2

Answer by alberyjones · Dec 11, 2017 at 03:38 PM

I hit this issue and have figured out the problem. I did a standard override in C# and ended up with a call to the base method:

 public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
 {
     base.OnGUI(position, property, label);
 }

It's the call to the base method that writes the "No GUI implemented" message - presumably to indicate when you haven't overridden it and it just calls the default implementation.

If you comment out or remove the base.OnGui call the problem is resolved :)

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Answer 3

Answer by erickluiss · Feb 19, 2021 at 03:49 AM

Quite late answer but the solution is simple. Change the "base.OnGUI" method by: EditorGUI.PropertyField() method at the end.

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chakaramba · Jan 16 at 09:17 AM 0

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Thanks, @erickluiss, that saved me a little time today!

Property Drawer "No GUI implemented" error in Editor

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