How to select elements in nested ReorderableList in a CustomEditor?

Question

I have a ReorderableList in my CustomEditor script. In the drawElementCallback I added a second nested ReorderableList. Everything wor

Answer 1

It looks like you are creating the inner lists over and over without storing them anywhere. I modified your code to store the reorderable lists in a dictionary with the element.propertyPath as a key. Hope this helps.

using System;
using System.Collections.Generic;
using UnityEditor;
using UnityEditorInternal;
using UnityEngine;

[Serializable]
public class SomeClass
{
    public string Name;
    public List<SomeClass> InnerList;
}

[CreateAssetMenu(menuName = "Example", fileName = "new Example Asset")]
public class Example : ScriptableObject
{
    public List<SomeClass> SomeClasses;

    [CustomEditor(typeof(Example))]
    private class ModuleDrawer : Editor
    {
        private SerializedProperty SomeClasses;
        private ReorderableList list;

        private Dictionary<string, ReorderableList> innerListDict = new Dictionary<string, ReorderableList>();

        private void OnEnable()
        {
            SomeClasses = serializedObject.FindProperty("SomeClasses");

            // setupt the outer list
            list = new ReorderableList(serializedObject, SomeClasses)
            {
                displayAdd = true,
                displayRemove = true,
                draggable = true,

                drawHeaderCallback = rect =>
                {
                    EditorGUI.LabelField(rect, "Outer List");
                },

                drawElementCallback = (rect, index, a, h) =>
                {
                    // get outer element
                    var element = SomeClasses.GetArrayElementAtIndex(index);

                    var InnerList = element.FindPropertyRelative("InnerList");

                    string listKey = element.propertyPath;

                    ReorderableList innerReorderableList;

                    if (innerListDict.ContainsKey(listKey))
                    {
                        // fetch the reorderable list in dict
                        innerReorderableList = innerListDict[listKey];
                    }
                    else
                    {
                        // create reorderabl list and store it in dict
                        innerReorderableList = new ReorderableList(element.serializedObject, InnerList)
                        {
                            displayAdd = true,
                            displayRemove = true,
                            draggable = true,

                            drawHeaderCallback = innerRect =>
                            {
                                EditorGUI.LabelField(innerRect, "Inner List");
                            },

                            drawElementCallback = (innerRect, innerIndex, innerA, innerH) =>
                            {
                                // Get element of inner list
                                var innerElement = InnerList.GetArrayElementAtIndex(innerIndex);

                                var name = innerElement.FindPropertyRelative("Name");

                                EditorGUI.PropertyField(innerRect, name);
                            }
                        };
                        innerListDict[listKey] = innerReorderableList;
                    }

                    // Setup the inner list
                    var height = (InnerList.arraySize + 3) * EditorGUIUtility.singleLineHeight;
                    innerReorderableList.DoList(new Rect(rect.x, rect.y, rect.width, height));
                },

                elementHeightCallback = index =>
                {
                    var element = SomeClasses.GetArrayElementAtIndex(index);

                    var innerList = element.FindPropertyRelative("InnerList");

                    return (innerList.arraySize + 4) * EditorGUIUtility.singleLineHeight;
                }
            };
        }

        public override void OnInspectorGUI()
        {
            serializedObject.Update();

            list.DoLayoutList();

            serializedObject.ApplyModifiedProperties();
        }
    }
}