FairyGUI.GList.HandleScroll C# (CSharp) Method

        void HandleScroll(bool forceUpdate)
        {
            if (_eventLocked)
                return;

            if (_layout == ListLayoutType.SingleColumn || _layout == ListLayoutType.FlowHorizontal)
            {
                if (_loop)
                {
                    float pos = scrollPane.scrollingPosY;
                    //循环列表的核心实现，滚动到头尾时重新定位
                    float roundSize = _numItems * (_itemSize.y + _lineGap);
                    if (pos == 0)
                        scrollPane.posY = roundSize;
                    else if (pos == scrollPane.contentHeight - scrollPane.viewHeight)
                        scrollPane.posY = scrollPane.contentHeight - roundSize - this.viewHeight;
                }

                HandleScroll1(forceUpdate);
                HandleArchOrder1();
            }
            else if (_layout == ListLayoutType.SingleRow || _layout == ListLayoutType.FlowVertical)
            {
                if (_loop)
                {
                    float pos = scrollPane.scrollingPosX;
                    //循环列表的核心实现，滚动到头尾时重新定位
                    float roundSize = _numItems * (_itemSize.x + _columnGap);
                    if (pos == 0)
                        scrollPane.posX = roundSize;
                    else if (pos == scrollPane.contentWidth - scrollPane.viewWidth)
                        scrollPane.posX = scrollPane.contentWidth - roundSize - this.viewWidth;
                }

                HandleScroll2(forceUpdate);
                HandleArchOrder2();
            }
            else
            {
                if (_loop)
                {
                    float pos = scrollPane.scrollingPosX;
                    //循环列表的核心实现，滚动到头尾时重新定位
                    float roundSize = (int)(_numItems / (_curLineItemCount * _curLineItemCount2)) * viewWidth;
                    if (pos == 0)
                        scrollPane.posX = roundSize;
                    else if (pos == scrollPane.contentWidth - scrollPane.viewWidth)
                        scrollPane.posX = scrollPane.contentWidth - roundSize - this.viewWidth;
                }

                HandleScroll3(forceUpdate);
            }

            _boundsChanged = false;
        }