private void _setItemInfo(ScrollRectListItem _item, Int32 _index, GameObject _go)
{
_go.name = _index.ToString();
if (m_vertical)
{
_go.GetComponent <RectTransform>().anchoredPosition = new Vector2(0, -(_index * m_item_length));
}
else
{
_go.GetComponent <RectTransform>().anchoredPosition = new Vector2(_index * m_item_length, 0);
}
_item.SetItem(_index, _go);
if (OnItemVisible != null)
{
OnItemVisible(_go, _index);
}
}
public void SetMaxItemCount(Int32 _count)
{
if (m_max_item_count == _count)
{
var node = m_items.First;
Int32 index = 0;
while (node != null)
{
_setItemInfo(node.Value, index, node.Value.Go);
index++;
node = node.Next;
}
return;
}
m_max_item_count = _count;
if (m_vertical)
{
m_container.sizeDelta = new Vector2(m_item_prefab.GetComponent <RectTransform>().sizeDelta.x,
m_max_item_count * m_item_length);
}
else
{
m_container.sizeDelta = new Vector2(m_max_item_count * m_item_length,
m_item_prefab.GetComponent <RectTransform>().sizeDelta.y);
}
m_items.Clear();
for (int i = 0; i < m_all_items.Count; i++)
{
if (i >= m_max_item_count)
{
m_all_items[i].SetActive(false);
continue;
}
m_all_items[i].SetActive(true);
ScrollRectListItem item = new ScrollRectListItem();
_setItemInfo(item, i, m_all_items[i]);
m_items.AddLast(item);
}
}
private void _onValueChange(Vector2 _pos)
{
if (m_items.Count <= 0)
{
return;
}
float container_pos = _getContainerPos();
Int32 first_visible_index = (Int32)(container_pos / m_item_length);
if (first_visible_index < 0)
{
return;
}
Int32 end_visible_index = first_visible_index + m_max_visible_count - 1;
if (end_visible_index >= m_max_item_count)
{
return;
}
Int32 cur_first_visible_index = m_items.First.Value.Index;
if (first_visible_index == cur_first_visible_index)
{
return;
}
//移动在一个单元内
if (Mathf.Abs(first_visible_index - cur_first_visible_index) == 1)
{
//把头部移到尾部
if (first_visible_index > cur_first_visible_index)
{
ScrollRectListItem item = m_items.First.Value;
_setItemInfo(item, end_visible_index, item.Go);
m_items.RemoveFirst();
m_items.AddLast(item);
}
//把尾部移到头部
if (first_visible_index < cur_first_visible_index)
{
ScrollRectListItem item = m_items.Last.Value;
_setItemInfo(item, first_visible_index, item.Go);
m_items.RemoveLast();
m_items.AddFirst(item);
}
}
//极速移动超过一个单元
else
{
LinkedListNode <ScrollRectListItem> node = m_items.First;
Int32 count = 0;
while (node != null)
{
_setItemInfo(node.Value, first_visible_index + count, node.Value.Go);
count++;
node = node.Next;
}
}
}