multixr/Assets/VRCSDK/Dependencies/VRChat/Editor/Components/EditorCoroutine.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using Object = UnityEngine.Object;

public class EditorCoroutine
{
	public static EditorCoroutine Start( IEnumerator _routine )
	{
		EditorCoroutine coroutine = new EditorCoroutine(_routine);
		coroutine.start();
		return coroutine;
	}


    public static EditorCoroutine Start(System.Action _action)
    {
        EditorCoroutine coroutine = new EditorCoroutine(_action);
        coroutine.start();
        return coroutine;
    }

    readonly IEnumerator routine;
	EditorCoroutine( IEnumerator _routine )
	{
		routine = _routine;
    }

    readonly System.Action action;
    EditorCoroutine(System.Action _action)
    {
        action = _action;
    }

    void start()
	{
		EditorApplication.update += update;
	}
	public void stop()
	{
        EditorApplication.update -= update;
	}

	void update()
	{
        if (routine != null)
        {
            if (!routine.MoveNext())
                stop();
        }
        else if (action != null)
        {
            action();
            stop();
        }
        else
            stop();

    }
}