protected override bool AdjustmentItemSize(ScrollListItem item)
{
if (item.width != itemDefaultfSize.x || item.height != itemDefaultfSize.y)
{
item.rectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, itemDefaultfSize.x);
item.rectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, itemDefaultfSize.y);
}
return(false);
}
protected override bool AdjustmentItemSize(ScrollListItem item)
{
if (item.height != _itemModels[item.index].height)
{
//Debug.Log($"item[{item.index}]的尺寸改变 {_itemModels[item.index].height} => {item.height}");
_itemModels[item.index].height = item.height;
return(true);
}
return(false);
}
protected override bool AdjustmentItemSize(ScrollListItem item)
{
if (item.width != _itemModels[item.index].width)
{
//Debug.Log($"item[{item.index}]的尺寸改变 {_itemModels[item.index].width} => {item.width}");
_itemModels[item.index].width = item.width;
return(true);
}
return(false);
}
protected override void Refresh(UpdateData updateConfig, out int lastStartIndex)
{
if (updateConfig.keepPaddingType == EKeepPaddingType.END)
{
var targetRenderStartPos = (ContentHeight - updateConfig.tempLastContentRect.height) + contentRenderStartPos;
var temp = content.localPosition;
temp.y = targetRenderStartPos;
content.localPosition = temp;
}
contentRenderStartPos = content.localPosition.y;
if (contentRenderStartPos < 0)
{
contentRenderStartPos = 0;
}
else if (contentRenderStartPos > ContentHeight - viewportSize.y)
{
contentRenderStartPos = ContentHeight - viewportSize.y;
}
int dataIdx;
float startPos = layout.paddingTop;
for (dataIdx = 0; dataIdx < _itemModels.Count; dataIdx++)
{
var dataBottom = startPos + _itemModels[dataIdx].height;
if (dataBottom >= contentRenderStartPos)
{
//就是我了
break;
}
startPos = dataBottom + layout.gap;
}
lastStartIndex = dataIdx;
//显示的内容刚好大于这个值即可
float contentHeightLimit = viewportSize.y;
float itemY = -startPos;
/// <summary>
/// 最后一次显示的Item的缓存
/// </summary>
Dictionary <ScrollListItemModel, ScrollListItem> lastShowingItems = new Dictionary <ScrollListItemModel, ScrollListItem>(_showingItems);
_showingItems.Clear();
while (dataIdx < _itemModels.Count)
{
var model = _itemModels[dataIdx];
ScrollListItem item = CreateItem(model, dataIdx, lastShowingItems);
//item.gameObject.name += $"_{_itemModels[dataIdx].height}";
_showingItems[model] = item;
var pos = Vector3.zero;
pos.y = itemY;
item.rectTransform.localPosition = pos;
//下一个item的Y坐标
itemY -= (item.height + layout.gap);
//下一个item的索引
dataIdx++;
if (-contentRenderStartPos - itemY >= contentHeightLimit)
{
break;
}
}
//回收没有使用的item
RecycleUselessItems(lastShowingItems);
}
/// <summary>
/// 创建一个列表项Item
/// </summary>
/// <param name="data"></param>
/// <param name="dataIdx"></param>
/// <param name="lastShowingItems"></param>
/// <returns></returns>
protected ScrollListItem CreateItem(ScrollListItemModel model, int dataIdx, Dictionary <ScrollListItemModel, ScrollListItem> lastShowingItems)
{
ScrollListItem item;
if (lastShowingItems.ContainsKey(model) && lastShowingItems[model].index == dataIdx) //本来就在显示列表中，直接返回
{
item = lastShowingItems[model];
lastShowingItems.Remove(model);
}
else
{
if (_recycledItems.Count > 0)
{
ScrollListItem tempItem = null;
//tempItem = _recycledItems[0];
int idx = _recycledItems.Count;
while (--idx > -1)
{
tempItem = _recycledItems[idx];
if (tempItem.index == dataIdx && tempItem.data.Equals(model.data)) //以前回收的一个对象，刚好对应的数据一致，直接返回
{
item = tempItem;
_recycledItems.RemoveAt(idx);
item.gameObject.SetActive(true);
RenderItem(item, model.data, false);
return(item);
}
}
//没有绝对匹配的，则抽取最后找到的item，之后刷新数据并返回
item = tempItem;
_recycledItems.Remove(tempItem);
//当一个列表项，将被复用时触发
onItemBeforeReuse?.Invoke(item);
}
else
{
var go = GameObject.Instantiate(itemPrefab, content);
if (false == go.activeInHierarchy)
{
go.SetActive(true);
}
item = go.AddComponent <ScrollListItem>();
item.rectTransform.anchorMin = Vector2.up;
item.rectTransform.anchorMax = Vector2.up;
item.rectTransform.pivot = Vector2.up;
//Debug.Log($"新生成的 Item GameObject");
}
var name = string.Format("item_{0}", dataIdx);
item.gameObject.name = name;
item.index = dataIdx;
item.data = model.data;
item.width = _itemModels[dataIdx].width;
item.height = _itemModels[dataIdx].height;
if (false == item.gameObject.activeInHierarchy)
{
item.gameObject.SetActive(true);
}
RenderItem(item, model.data, true);
}
if (item.index != dataIdx)
{
//插入列表项可能导致数据索引改变
item.index = dataIdx;
}
return(item);
}
/// <summary> /// 检测并校正item的大小，如果进行了校正，返回true /// </summary> /// <param name="item"></param> /// <returns></returns> protected abstract bool AdjustmentItemSize(ScrollListItem item);
protected void RenderItem(ScrollListItem item, object data, bool isOnlySwitchActive)
{
onRenderItem?.Invoke(item, data, isOnlySwitchActive);
}
protected override void Refresh(UpdateData updateConfig, out int lastStartIndex)
{
//内容容器宽度
var contentWidth = content.rect.width;
if (updateConfig.keepPaddingType == EKeepPaddingType.END)
{
var targetRenderStartPos = (contentWidth - updateConfig.tempLastContentRect.width) + contentRenderStartPos;
var temp = content.localPosition;
temp.x = -targetRenderStartPos;
content.localPosition = temp;
}
//content的滚动是负数
contentRenderStartPos = -content.localPosition.x;
if (contentRenderStartPos < 0)
{
contentRenderStartPos = 0;
}
else if (contentRenderStartPos > contentWidth - viewportSize.x)
{
contentRenderStartPos = contentWidth - viewportSize.x;
}
int dataIdx;
float startPos = layout.paddingLeft;
for (dataIdx = 0; dataIdx < _itemModels.Count; dataIdx++)
{
var dataRight = startPos + _itemModels[dataIdx].width;
if (dataRight >= contentRenderStartPos)
{
//就是我了
break;
}
startPos = dataRight + layout.gap;
}
lastStartIndex = dataIdx;
//显示的内容刚好大于这个值即可
float contentWidthLimit = viewportSize.x;
float itemX = startPos;
/// <summary>
/// 最后一次显示的Item的缓存
/// </summary>
Dictionary <ScrollListItemModel, ScrollListItem> lastShowingItems = new Dictionary <ScrollListItemModel, ScrollListItem>(_showingItems);
_showingItems.Clear();
while (dataIdx < _itemModels.Count)
{
var model = _itemModels[dataIdx];
ScrollListItem item = CreateItem(model, dataIdx, lastShowingItems);
//item.gameObject.name += $"_{_itemModels[dataIdx].height}";
_showingItems[model] = item;
var pos = Vector3.zero;
pos.x = itemX;
item.rectTransform.localPosition = pos;
//下一个item的X坐标
itemX += (item.width + layout.gap);
//下一个item的索引
dataIdx++;
if (itemX - contentRenderStartPos >= contentWidthLimit)
{
break;
}
}
//回收没有使用的item
RecycleUselessItems(lastShowingItems);
}
protected override void Refresh(UpdateData updateConfig, out int lastStartIndex)
{
var scrollX = -content.localPosition.x;
if (scrollX < 0)
{
scrollX = 0;
}
var scrollY = content.localPosition.y;
if (scrollY < 0)
{
scrollY = 0;
}
bool isColByCol = layout.constraint == EGridConstraint.FIXED_ROW_COUNT ? true : false;
//计算出关联的所有Item的索引
List <GridPos> list = new List <GridPos>();
lastStartIndex = 0;
if (colCount > 0 && rowCount > 0)
{
//根据滚动区域左上角算出起始item的二维位置;
GridPos startPos = new GridPos((int)(scrollX / _bigW), (int)(scrollY / _bigH), colCount, rowCount, _bigW, _bigH);
lastStartIndex = startPos.index;
//根据滚动区域左下角算出结束item的二维位置
GridPos endPos = new GridPos((int)((scrollX + viewportSize.x) / _bigW), (int)((scrollY + viewportSize.y) / _bigH), colCount, rowCount, _bigW, _bigH);
if (isColByCol)
{
RefreshGridPosColByCol(list, ref startPos, ref endPos);
}
else
{
RefreshGridPosRowByRow(list, ref startPos, ref endPos);
}
}
/// <summary>
/// 最后一次显示的Item的缓存
/// </summary>
Dictionary <ScrollListItemModel, ScrollListItem> lastShowingItems = new Dictionary <ScrollListItemModel, ScrollListItem>(_showingItems);
_showingItems.Clear();
for (int i = 0; i < list.Count; i++)
{
var gridPos = list[i];
var model = _itemModels[gridPos.index];
ScrollListItem item = CreateItem(model, gridPos.index, lastShowingItems);
_showingItems[model] = item;
var pos = new Vector3(gridPos.pixelX, -gridPos.pixelY, 0);
pos.x += layout.paddingLeft;
pos.y -= layout.paddingTop;
item.rectTransform.localPosition = pos;
}
//回收没有使用的item
RecycleUselessItems(lastShowingItems);
}