public void Init()
{
_canChangeCenterItem = true;
int useItemCount = showItemCountInView * _dataLengthMul;
// 乘1万再除以1万的方式，就是为了保留4位小数
_factor = (Mathf.RoundToInt((1f / useItemCount) * 10000f)) * 0.0001f;
_totalHorizontalWidth = useItemCount * itemSpacingWidth;
_oriListCenterIndex = useItemCount / 2;
if (useItemCount % 2 == 0)
{
_oriListCenterIndex = useItemCount / 2 - 1;
}
itemTemplate.SetActive(true);
for (int i = 0; i < useItemCount; i++)
{
GameObject go = Instantiate(itemTemplate);
go.name = i.ToString();
go.transform.SetParent(_tr);
go.transform.localPosition = new Vector3(_factor * i * _totalHorizontalWidth - 0.5f * _totalHorizontalWidth, yFixedPosVal, 0);
go.transform.localScale = Vector3.one;
LoopScrollViewWithSelectedEffect_Drag drag = go.GetComponent <LoopScrollViewWithSelectedEffect_Drag>();
if (drag == null)
{
drag = go.AddComponent <LoopScrollViewWithSelectedEffect_Drag>();
}
drag.SetScrollView(this);
LoopScrollViewWithSelectedEffect_Item item = go.GetComponent <LoopScrollViewWithSelectedEffect_Item>();
if (item == null)
{
item = go.AddComponent <LoopScrollViewWithSelectedEffect_Item>();
}
item.oriListIndex = i;
item.dataLength = _dataLength;
item.SetScollView(this);
item.SetItemDefaultShowCallback(itemDefaultShowCallback);
item.SetItemSelectCallback(itemSelectCallback);
item.SetItemUnSelectCallback(itemUnSelectCallback);
item.SetItemPassBeginCallback(itemPassBeginCallback);
item.SetItemPassEndCallback(itemPassEndCallback);
_oriItemList.Add(item);
}
itemTemplate.SetActive(false);
#region 修正数据
int index = 0;
int centerItemIndex = _startCenterDataIndex % useItemCount;
int dataValOffset = _startCenterDataIndex - centerItemIndex;
// 必须倒序循环，因为要按“中心卡牌为0，左边为负，右边为正”的位置摆牌（正序循环则会相反）
for (int i = useItemCount - 1; i >= 0; i--)
{
var item = _oriItemList[i];
// 乘上factor就是为了让centerOffSet是个小数
item.centerOffSet = _factor * (_oriListCenterIndex - index);
item.SetSelectState(false);
index++;
}
xValSortItemList = new List <LoopScrollViewWithSelectedEffect_Item>(_oriItemList);
_curCenterItem = _oriItemList[centerItemIndex];
_totalHorizontalWidth = useItemCount * itemSpacingWidth;
// 为了让中心单位出现在视图中心，就得用0.5减（和后面GetXPosValue函数有关）
// 为什么不直接用0.5f的原因：如果用0.5f会算出有些牌SiblingIndex重复问题，但在滑动牌组时，应是每一张牌各占一层。
float targetVal = 0.5f + startCenterXOffset - _curCenterItem.centerOffSet;
LerpTweenToTarget(0, targetVal, 0, false);
SortItemListByXVal();
int indexOffset = _curCenterItem.oriListIndex - _curCenterItem.sortXValListIndex;
for (var i = 0; i < xValSortItemList.Count; i++)
{
var item = xValSortItemList[i];
int dataIndex = (i + indexOffset + dataValOffset) % _dataLength;
if (dataIndex < 0)
{
dataIndex += _dataLength;
}
item.dataIndex = dataIndex;
item.DefaultShow();
}
#endregion
for (int i = 0; i < xValSortItemList.Count; i++)
{
var item = xValSortItemList[i];
item.DefaultShow();
}
}
