UnityEditor.IncrementalInitialize.OnEvent C# (CSharp) Method

        public void OnEvent()
        {
            if (this.m_IncrementOnNextEvent)
            {
                this.m_InitState += 1;
                this.m_IncrementOnNextEvent = false;
            }
            switch (this.m_InitState)
            {
                case State.PreInitialize:
                    if (Event.current.type == EventType.Repaint)
                    {
                        this.m_IncrementOnNextEvent = true;
                        HandleUtility.Repaint();
                    }
                    break;

                case State.Initialize:
                    this.m_IncrementOnNextEvent = true;
                    break;
            }
        }