ReorderableList PropertyDrawer

        #region Универсальный фолд

        private static readonly Dictionary<object, bool> _foldouts2 = new Dictionary<object, bool>();

        public static bool ShowFold(string text, object @object) {
            var result = false;
            if (!_foldouts2.ContainsKey(@object))
                _foldouts2.Add(@object, false);
            else
                result = _foldouts2[@object];
            result              = EditorGUILayout.Foldout(result, text, true);
            _foldouts2[@object] = result;
            return result;
        }

        public static bool ShowFold(Rect rect, string text, object @object, bool simply = true) {
            var result = false;
            if (!_foldouts2.ContainsKey(@object))
                _foldouts2.Add(@object, false);
            else
                result = _foldouts2[@object];
            result              = EditorGUI.Foldout(rect, result, text, simply);
            _foldouts2[@object] = result;
            return result;
        }

        public static bool GetFoldState(object @object) {
            if (!_foldouts2.ContainsKey(@object)) return false;
            return _foldouts2[@object];
        }

        #endregion

        #region Reorderable list

        private static readonly Dictionary<string, ReorderableList> rlist      = new Dictionary<string, ReorderableList>();
        private static readonly Dictionary<string, string>          rlistTitle = new Dictionary<string, string>();
        private static readonly Dictionary<string, object>          rlistFold  = new Dictionary<string, object>();

        /// <summary>
        /// Add array property to Reorderable array
        /// </summary>
        /// <param name="prop"></param>
        /// <param name="title"></param>
        public static void AddArray(SerializedProperty prop, string title, bool draggable = true, bool add = true) {
            if (prop == null) return;
            if (!rlist.ContainsKey(GetPropPath(prop)) || rlist[GetPropPath(prop)].serializedProperty != prop) {
                string s            = "{0:D1}";
                var rl = new ReorderableList(prop.serializedObject, prop, draggable, false, add, add) {
                    drawHeaderCallback = (Rect rect) => { EditorGUI.LabelField(rect, title); },
                    drawElementCallback = (Rect rect, int index, bool isActive, bool isFocused) => {
                                              EditorGUI.PropertyField(rect, prop.GetArrayElementAtIndex(index), new GUIContent(string.Format(s, index)));
                                          }
                };
                rlist[GetPropPath(prop)]      = rl;
                rlistTitle[GetPropPath(prop)] = title;
                if (!rlistFold.ContainsKey(GetPropPath(prop)))
                    rlistFold[GetPropPath(prop)] = new object();
            }
        }

        /// <summary>
        /// Show array property at Rect
        /// </summary>
        /// <param name="prop"></param>
        /// <param name="rect"></param>
        public static void ShowArray(SerializedProperty prop, Rect rect) {
            if (rlist.ContainsKey(GetPropPath(prop))) {
                rect.height = EditorGUIUtility.singleLineHeight;
                if (ShowFold(rect, rlistTitle[GetPropPath(prop)], rlistFold[GetPropPath(prop)])) {
                    rect.height = GetArrayHeight(prop);
                    var lw = EditorGUIUtility.labelWidth;
                    SetLabelWidth(50f, true);
                    rlist[GetPropPath(prop)].DoList(rect);
                    EditorGUIUtility.labelWidth = lw;
                }
            }
        }

        /// <summary>
        /// Return array property rect height
        /// </summary>
        /// <param name="prop"></param>
        /// <returns></returns>
        public static float GetArrayHeight(SerializedProperty prop) {
            if (rlist.ContainsKey(GetPropPath(prop))) {
                if (!GetFoldState(rlistFold[GetPropPath(prop)]))
                    return EditorGUIUtility.singleLineHeight;
                return rlist[GetPropPath(prop)].GetHeight();
            }
            return 0f;
        }

        public static string GetPropPath(SerializedProperty prop) {
            return $"{prop.serializedObject.targetObject.name}.{prop.propertyPath}";
        }

        #endregion
///////////////////////////////////////////////////
// Реализация проперти дровера
///////////////////////////////////////////////////
using System.Collections.Generic;
using EasyEditorGUI;
using SO;
using UnityEditor;
using UnityEditorInternal;
using UnityEngine;

[CustomPropertyDrawer(typeof(Materials))]
public class MaterialsPropertyDrawer : PropertyDrawer {
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
        var p = property.FindPropertyRelative("paths");
        eGUI.ShowArray(p, position);
    }

    public override float GetPropertyHeight(SerializedProperty property, GUIContent label) {
        var p = property.FindPropertyRelative("paths");
        eGUI.AddArray(p, label.text);
        return eGUI.GetArrayHeight(p);
    }
}