RotorzGUIHelper without Delegate.CreateDelegate

RotorzGUIHelper.cs

// Copyright (c) 2012-2013 Rotorz Limited. All rights reserved. Use of this source code is governed
// by a BSD-style license that can be found in the LICENSE file.

using UnityEngine;
using UnityEditor;

using System;
using System.Reflection;

namespace FullInspector.Rotorz.ReorderableList.Internal {

    /// <summary>
    /// Utility functions to assist with GUIs.
    /// </summary>
    internal static class RotorzGUIHelper {

        static RotorzGUIHelper() {
            var tyGUIClip = typeof(GUI).Assembly.GetType("UnityEngine.GUIClip");
            if (tyGUIClip != null) {
                var piVisibleRect = tyGUIClip.GetProperty("visibleRect", BindingFlags.Static | BindingFlags.Public);
                if (piVisibleRect != null) {
                    var getGetMethod = piVisibleRect.GetGetMethod();
                    VisibleRect = () => (Rect)getGetMethod.Invoke(null, null);
                }
            }

            var miFocusTextInControl = typeof(EditorGUI).GetMethod("FocusTextInControl", BindingFlags.Static | BindingFlags.Public);
            if (miFocusTextInControl == null)
                miFocusTextInControl = typeof(GUI).GetMethod("FocusControl", BindingFlags.Static | BindingFlags.Public);

            FocusTextInControl = str => miFocusTextInControl.Invoke(null, new object[] { str });
        }

        /// <summary>
        /// Gets visible rectangle within GUI.
        /// </summary>
        /// <remarks>
        /// <para>VisibleRect = TopmostRect + scrollViewOffsets</para>
        /// </remarks>
        public static Func<Rect> VisibleRect;

        /// <summary>
        /// Focus control and text editor where applicable.
        /// </summary>
        public static Action<string> FocusTextInControl;

    }

}