/// <summary>
/// 更新Item位置
/// </summary>
protected override void UpdateItemPosition(LoopItem item, int index)
{
Vector3 pos = item.Transform.localPosition;
pos.y = index * ItemLength;
item.Transform.localPosition = pos;
}
/// <summary>
/// 生成Items
/// </summary>
protected void InstantiateItems(int count, Transform parent, bool isVertical)
{
if (string.IsNullOrEmpty(PrefabPath))
{
return;
}
GameObject prefab = Resources.Load(PrefabPath) as GameObject;
if (prefab == null)
{
return;
}
Vector3 hidePos = ScrollView.movement == UIScrollView.Movement.Vertical ? new Vector3(0, 5000, 0) : new Vector3(5000, 0, 0);
for (int x = 0, length = count; x < length; x++)
{
GameObject go = Instantiate(prefab);
go.transform.parent = parent;
go.transform.localPosition = hidePos;
go.transform.localScale = Vector3.one;
LoopItem item = go.GetComponent <LoopItem>();
go.SetActive(false);
if (item == null)
{
continue;
}
Items.Add(item);
}
}
public GameObject GetChildItem()
{
//查找有没有被回收的子节点
for (int i = 0; i < content.childCount; i++)
{
if (!content.GetChild(i).gameObject.activeSelf)
{
content.GetChild(i).gameObject.SetActive(true);
return(content.GetChild(i).gameObject);
}
}
//如果没有，创建一个
GameObject childItem = GameObject.Instantiate(childItemPrefab, content.transform);
//设置数据
childItem.transform.localScale = Vector3.one;
childItem.transform.localPosition = Vector3.zero;
//设置锚点
childItem.GetComponent <RectTransform>().anchorMin = new Vector2(0, 1);
childItem.GetComponent <RectTransform>().anchorMax = new Vector2(0, 1);
//设置宽高
childItem.GetComponent <RectTransform>().sizeDelta = contentLayoutGroup.cellSize;
LoopItem loopItem = childItem.AddComponent <LoopItem>();
loopItem.onAddHead += this.OnAddHead;
loopItem.onRemoveHead += this.onRemoveHead;
loopItem.onAddLast += this.onAddLast;
loopItem.onRemoneLast += this.onRemoveLast;
return(childItem);
}
/// <summary>
/// 更新Item資料與位置
/// </summary>
protected virtual void UpdateItem(LoopItem item, int index)
{
item.IndexProperty = index;
bool isNull = DataList == null || index < 0 || index >= DataList.Count;
item.SetData(isNull ? null : DataList[index]);
item.SetActive(!isNull);
UpdateItemPosition(item, index);
}
/// <summary>
/// 將Item移至尾端
/// </summary>
protected virtual void MoveItemToEnd(int needChangeID, int movement)
{
for (int x = 0, count = Items.Count; x < count; x++)
{
LoopItem item = Items[x];
if (item.IndexProperty > needChangeID)
{
continue;
}
UpdateItem(item, item.IndexProperty + movement);
}
}
/// <summary> /// 更新Item位置 /// </summary> protected abstract void UpdateItemPosition(LoopItem item, int index);
