Unity的GUILayout.TextField支持赋值粘贴的办法

unity的编辑器文本输入框GUILayout.TextField不能快捷键复制粘贴，很不好，教大家解决这个问题

用法

m_txt = MyGUILayout.TextField(m_txt);
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其中MyGUILayout代码如下

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MyGUILayout
{
    public static string HandleCopyPaste(int controlID)
    {
        if (controlID == GUIUtility.keyboardControl)
        {
            if (Event.current.type == UnityEngine.EventType.KeyUp && (Event.current.modifiers == EventModifiers.Control || Event.current.modifiers == EventModifiers.Command))
            {
                if (Event.current.keyCode == KeyCode.C)
                {
                    Event.current.Use();
                    TextEditor editor = (TextEditor)GUIUtility.GetStateObject(typeof(TextEditor), GUIUtility.keyboardControl);
                    editor.Copy();
                }
                else if (Event.current.keyCode == KeyCode.V)
                {
                    Event.current.Use();
                    TextEditor editor = (TextEditor)GUIUtility.GetStateObject(typeof(TextEditor), GUIUtility.keyboardControl);
                    editor.Paste();
#if UNITY_5_3_OR_NEWER || UNITY_5_3
                        return editor.text; //以及更高的unity版本中editor.content.text已经被废弃，需使用editor.text代替
#else
                    return editor.content.text;
#endif
                }
                else if (Event.current.keyCode == KeyCode.A)
                {
                    Event.current.Use();
                    TextEditor editor = (TextEditor)GUIUtility.GetStateObject(typeof(TextEditor), GUIUtility.keyboardControl);
                    editor.SelectAll();
                }
            }
        }
        return null;
    }

    /// <summary>
    /// TextField复制粘贴的实现
    /// </summary>
    public static string TextField(string value, params GUILayoutOption[] options)
    {
        int textFieldID = GUIUtility.GetControlID("TextField".GetHashCode(), FocusType.Keyboard) + 1;
        if (textFieldID == 0)
            return value;
        //处理复制粘贴的操作
        value = HandleCopyPaste(textFieldID) ?? value;
        return GUILayout.TextField(value, options);
    }
}

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引用 https://gameinstitute.qq.com/community/detail/126731