GUI.enabled 是否启用？

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public bool allOptions = true;
	public bool extended1 = true;
	public bool extended2 = true;
	void OnGUI() {
		allOptions = GUI.Toggle(new Rect(0, 0, 150, 20), allOptions, "Edit All Options");
		GUI.enabled = allOptions;
		extended1 = GUI.Toggle(new Rect(20, 20, 130, 20), extended1, "Extended Option 1");
		extended2 = GUI.Toggle(new Rect(20, 40, 130, 20), extended2, "Extended Option 2");
		GUI.enabled = true;
		if (GUI.Button(new Rect(0, 60, 150, 20), "Ok"))
			print("user clicked ok");

	}
}

//该值跟踪扩展选项是否被禁用。
var allOptions : boolean = true;

//2个扩展选项的开关
var extended1 : boolean = true;
var extended2 : boolean = true;
function OnGUI () {

	//创建一个开关，用于控制下面GUI元素是否可编辑
	allOptions = GUI.Toggle (Rect (0,0,150,20), allOptions, "Edit All Options");

	//GUI元素的互动开关，禁用的话所有元素将变为变透明
	GUI.enabled = allOptions;

	// These two controls will only be enabled if the button above is on.
	extended1 = GUI.Toggle (Rect (20,20,130,20), extended1, "Extended Option 1");
	extended2 = GUI.Toggle (Rect (20,40,130,20), extended2, "Extended Option 2");

	// 这里我们打开GUI元素的互动，下面的元素将可以被操作
	GUI.enabled = true;

	// 创建一个按钮，这个按钮将不会被禁用
	if (GUI.Button (Rect (0, 60, 150, 20), "Ok"))
		print ("user clicked ok");
}