ReorderableListを使う時毎回、調べて持ってくるのが面倒だからまとめておく

SampleReorderableList.cs

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

    [CustomEditor( typeof( Sample ) )]
    public class SampleEditor : Editor {
        private ReorderableList reorderableList;

        private void OnEnable() {

            Sample sample = ( Sample )target;

            //ReorderableListを作成
            reorderableList = new ReorderableList(
              elements: ＊＊＊＊,    //配列要素
              elementType: typeof( ＊＊＊＊ ), //要素の種類
              draggable: true,           //ドラッグして要素を入れ替えられるか
              displayHeader: true,           //ヘッダーを表示するか
              displayAddButton: true,           //要素追加用の+ボタンを表示するか
              displayRemoveButton: true            //要素削除用の-ボタンを表示するか
            );

            reorderableList.drawElementBackgroundCallback = OnDrawElementBackground;
            reorderableList.drawElementCallback = OnDrawElement;
            reorderableList.drawFooterCallback = OnDrawFooter;
            reorderableList.drawHeaderCallback = OnDrawHeader;
            reorderableList.elementHeightCallback = OnElementHeight;
            reorderableList.onAddCallback = OnAdd;
            reorderableList.onAddDropdownCallback = OnAddDropdown;
            reorderableList.onCanAddCallback = OnCanAdd;
            reorderableList.onCanRemoveCallback = OnCanRemove;
            reorderableList.onChangedCallback = OnChanged;
            reorderableList.onMouseUpCallback = OnMouseUp;
            reorderableList.onRemoveCallback = OnRemove;
            reorderableList.onReorderCallback = OnReorder;
            reorderableList.onSelectCallback = OnSelect;
        }

        public override void OnInspectorGUI() {

            serializedObject.Update();
            reorderableList.DoLayoutList();
            serializedObject.ApplyModifiedProperties();

        }

        public void OnDrawElementBackground( Rect rect, int index, bool isActive, bool isFocused ) {
        }
        public void OnDrawElement( Rect rect, int index, bool isActive, bool isFocused ) {
        }
        public void OnDrawFooter( Rect rect ) {
        }
        public void OnDrawHeader( Rect rect ) {
        }
        public float OnElementHeight( int index ) {
            return EditorGUIUtility.singleLineHeight;
        }
        public void OnAdd( ReorderableList list ) {
        }
        public void OnAddDropdown( Rect buttonRect, ReorderableList list ) {
        }
        public bool OnCanAdd( ReorderableList list ) {
            return false;
        }
        public bool OnCanRemove( ReorderableList list ) {
            return false;
        }
        public void OnMouseUp( ReorderableList list ) {
        }
        public void OnChanged( ReorderableList list ) {
        }
        public void OnRemove( ReorderableList list ) {
        }
        public void OnReorder( ReorderableList list ) {
        }
        public void OnSelect( ReorderableList list ) {
        }

    }

}