public delegate void DrawEmpty()

public delegate DrawEmpty()

using Rotorz.ReorderableList;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

public class ExampleWindow : EditorWindow {
    private List<string> _list;

    private void OnEnable() {
        _list = new List<string>();
    }
    private void OnGUI() {
        ReorderableListGUI.ListField(_list, ReorderableListGUI.TextFieldItemDrawer, DrawEmptyMessage);
    }

    private string DrawEmptyMessage() {
        GUILayout.Label("List is empty!", EditorStyles.miniLabel);
    }
}

import Rotorz.ReorderableList;
import System.Collections.Generic;

class ExampleWindow extends EditorWindow {
    private var _list:List.<String>;

    function OnEnable() {
        _list = new List.<String>();
    }
    function OnGUI() {
        ReorderableListGUI.ListField(_list, ReorderableListGUI.TextFieldItemDrawer, DrawEmptyMessage);
    }

    function DrawEmptyMessage() {
        GUILayout.Label('List is empty!', EditorStyles.miniLabel);
    }
}