Question by potato_dev · Jun 04, 2020 at 06:43 PM · inspector editor-scripting inheritance custom editor popup

Popup to choose which child class I want in Custom Editor Inspector

Hello, I have something like this:

[Serializable]
public class Shape{
}

[Serializable]
public class Circle : Shape {
    public float radius;
}

[Serializable]
public class Rectangle : Shape {
    public float width;
    public float height;
}

and then a ScritableObject:

[CreateAssetMenu]
public class MyScriptable : ScriptableObject{
  public Shape[] shapes;
}

What I want is a popup in my inspector to select each Shape in my array. So what I tried:

[CustomEditor(typeof(MyScriptable))]
public class MyEditor : Editor {
    SerializedProperty shapes;
    void OnEnable() {
        shapes = serializedObject.FindProperty("shapes");
    }
    public override void OnInspectorGUI() {
        serializedObject.Update();
        EditorGUILayout.PropertyField(shapes);
        serializedObject.ApplyModifiedProperties();
    }
}

and to show the popup I did this:

[CustomPropertyDrawer(typeof(Shape))]
public class ShapeDrawer : PropertyDrawer {
  string[] options = {"Circle", "Rectangle"};
  private int index = 0;
  public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
    index = EditorGUI.Popup(position, index, options);
  }
}

But for some reason, when I select an option on one element, the selection occurs on all other elements. And I couldn't find a way to create the class on the type when I select. Plus of course I want to the inspector display all attributes of the selected class below the popup. Here is what I get: