spine-unity 4 compatibility helper

using System;

/*
 *  Compatibility helper for using spine-unity (as of Aug. 1 2016)
 *  with Unity 4.x
 */
namespace UnityEngine
{
    public static class GUILayoutExtensions
    {
        /// <summary>
        /// Creating dummy placeholders for elements not present in Unity4, but present in Unity5.
        /// </summary>
        public static object EditorStyles_HelpBox(this GUIStyle style)
        {
            return null;
        }
    }

    /// <summary>
    /// Wrapper for GUILayout static class, implementing some Using functionality present in Unity5 but not Unity4.
    /// </summary>
    public class GUILayoutWrapper : IDisposable
    {
        public enum EType
        {
            Horizontal,
            Vertical
        }

        public EType Type { get; private set; }

        public GUILayoutWrapper(EType type, params object [] args)
        {
            Type = type;
            switch (type)
            {
                case EType.Horizontal:
                    GUILayout.BeginHorizontal();
                    break;
                case EType.Vertical:
                    GUILayout.BeginVertical();
                    break;
            }
        }

        public void Dispose()
        {
            switch (Type)
            {
                case EType.Horizontal:
                    GUILayout.EndHorizontal();
                    break;
                case EType.Vertical:
                    GUILayout.EndVertical();
                    break;
            }
        }
    }
}

/// <summary>
/// Wrapper for EditorGUI static class, implementing some Using functionality present in Unity5 but not Unity4.
/// </summary>
namespace UnityEditor
{
    public class EditorGUIWrapper : IDisposable
    {
        public enum EType
        {
            DisabledGroup
        }

        public EType Type { get; private set; }

        public EditorGUIWrapper(EType type, params object [] args)
        {
            Type = type;

            switch (Type)
            {
                case EType.DisabledGroup:
                    EditorGUI.BeginDisabledGroup((bool)args[0]);
                    break;
            }
        }

        public void Dispose()
        {
            switch (Type)
            {
                case EType.DisabledGroup:
                    EditorGUI.EndDisabledGroup();
                    break;
            }
        }
    }
}