Custom Drawer Accessing Source Class

[atmuc]

I have a string field. I want to show a dropdown on FC inspector. I write an attribute drawer called ListSource. I send “Function Name” (AbilityList) as a string to that drawer. How can a drawer access to source class, call a function on the source class?

I want to do something like this;

https://odininspector.com/attributes/value-dropdown-attribute

 

[ListSource(“AbilityList”)]

public string AbilityName;

public List<ComboItem> AbilityList{…..}

 

 

[Gavalakis]

Hello there,

Within an AttributeDrawer, you can access the source object with the ‘.context’ property. You can then use reflection to call a function by name or in this case get a field (AbilityList) by name. Here is an example of such a drawer:

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public class Example : FlowNode     {           [ListSource("AbilityList")]         public string AbilityName;           public List<string> AbilityList = new List<string> { "Magic Missile", "Teleport", "Fireball" };     }       ///----------------------------------------------------------------------------------------------       public class ListSourceAttribute : DrawerAttribute     {         public readonly string listName;         public ListSourceAttribute(string listName) {             this.listName = listName;         }     }       ///----------------------------------------------------------------------------------------------       public class ListSourceAttributeDrawer : AttributeDrawer<ListSourceAttribute>     {         public override object OnGUI(GUIContent content, object instance) {             //...             var list = (List<string>)this.context.GetType().GetField(attribute.listName).GetValue(context);             instance = (string)EditorUtils.StringPopup(content, (string)instance, list);             //...             return instance;         }     }

Let me know if that works for you.

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