FairyGUI.ScrollPane.Refresh C# (CSharp) Method

        private void Refresh()
        {
            if (_owner.displayObject == null || _owner.displayObject.isDisposed)
                return;

            _needRefresh = false;
            UpdateContext.OnBegin -= _refreshDelegate;

            if (_pageMode)
            {
                int page;
                float delta;
                if (_yOverlap > 0 && _yPerc != 1 && _yPerc != 0)
                {
                    page = Mathf.FloorToInt(_yPos / _pageSize.y);
                    delta = _yPos - page * _pageSize.y;
                    if (delta > _pageSize.y / 2)
                        page++;
                    _yPos = page * _pageSize.y;
                    if (_yPos > _yOverlap)
                    {
                        _yPos = _yOverlap;
                        _yPerc = 1;
                    }
                    else
                        _yPerc = _yPos / _yOverlap;
                }

                if (_xOverlap > 0 && _xPerc != 1 && _xPerc != 0)
                {
                    page = Mathf.FloorToInt(_xPos / _pageSize.x);
                    delta = _xPos - page * _pageSize.x;
                    if (delta > _pageSize.x / 2)
                        page++;
                    _xPos = page * _pageSize.x;
                    if (_xPos > _xOverlap)
                    {
                        _xPos = _xOverlap;
                        _xPerc = 1;
                    }
                    else
                        _xPerc = _xPos / _xOverlap;
                }
            }
            else if (_snapToItem)
            {
                float tmpX = _xPerc == 1 ? 0 : _xPos;
                float tmpY = _yPerc == 1 ? 0 : _yPos;
                _owner.GetSnappingPosition(ref tmpX, ref tmpY);
                if (_xPerc != 1 && !Mathf.Approximately(tmpX, _xPos))
                {
                    _xPos = tmpX;
                    _xPerc = _xPos / _xOverlap;
                    if (_xPerc > 1)
                    {
                        _xPerc = 1;
                        _xPos = _xOverlap;
                    }
                }
                if (_yPerc != 1 && !Mathf.Approximately(tmpY, _yPos))
                {
                    _yPos = tmpY;
                    _yPerc = _yPos / _yOverlap;
                    if (_yPerc > 1)
                    {
                        _yPerc = 1;
                        _yPos = _yOverlap;
                    }
                }
            }

            Refresh2();

            onScroll.Call();
            if (_needRefresh) //user change scroll pos in on scroll
            {
                _needRefresh = false;
                UpdateContext.OnBegin -= _refreshDelegate;

                Refresh2();
            }

            _aniFlag = 0;
        }