private void UpdateSelected(int i)
{
if (i >= curVisibleStartIndex && i <= curVisibleEndIndex)
{
bool selected;
if (!IsMultiSelect)
{
selected = SelectedIndex == i;
}
else
{
selected = MultiSelectedIndexs.Contains(i);
}
SetHighLight(_items[i - curVisibleStartIndex], selected);
}
}
void UpdateVisibleItem(bool forceUpdate)
{
int newVisibleStartIndex;
int newVisibleEndIndex;
Vector2 viewPortSize = _scroll.viewport.rect.size;
Vector2 contentSize = _scroll.content.rect.size;
if (IsVertical)
{
float visibleStartY = (1 - _scroll.verticalNormalizedPosition) * (contentSize.y - viewPortSize.y);
float visibleEndY = visibleStartY + viewPortSize.y;
newVisibleStartIndex = calcVisibleMinIndex(visibleStartY, itemSpace.y, Padding.top, _rowCellCount, itemSize.y);
newVisibleEndIndex = CalcVisibleMaxIndex(visibleEndY, itemSpace.y, Padding.top, _rowCellCount, itemSize.y);
}
else
{
float visibleStartX = (_scroll.horizontalNormalizedPosition) * (contentSize.x - viewPortSize.x);
newVisibleStartIndex = Mathf.CeilToInt((visibleStartX + itemSpace.x - Padding.left + 0.1f) / (itemSize.x + itemSpace.x) - 1) * _colCellCount;
float visibleEndX = visibleStartX + viewPortSize.x;
newVisibleEndIndex = Mathf.CeilToInt((visibleEndX + itemSpace.x - Padding.left) / (itemSize.x + itemSpace.x)) * _colCellCount;
newVisibleStartIndex = calcVisibleMinIndex(visibleStartX, itemSpace.x, Padding.left, _colCellCount, itemSize.x);
newVisibleEndIndex = CalcVisibleMaxIndex(visibleEndX, itemSpace.x, Padding.left, _colCellCount, itemSize.x);
}
newVisibleStartIndex = Mathf.Clamp(newVisibleStartIndex, 0, GetDataCount() - 1);
newVisibleEndIndex = Mathf.Clamp(newVisibleEndIndex, 0, GetDataCount() - 1);
if (GetDataCount() == 0)
{
newVisibleStartIndex = 0;
newVisibleEndIndex = -1;
}
if (!forceUpdate && curVisibleStartIndex == newVisibleStartIndex && curVisibleEndIndex == newVisibleEndIndex)
{
return;
}
for (int i = curVisibleStartIndex; i <= curVisibleEndIndex; i++)
{
if (i < newVisibleStartIndex)
{
RectTransform item = _items[0];
_items.Remove(item);
RecycleItem(item);
}
}
for (int i = curVisibleEndIndex; i >= curVisibleStartIndex; i--)
{
if (i > newVisibleEndIndex)
{
RectTransform item = _items[_items.Count - 1];
_items.Remove(item);
RecycleItem(item);
}
}
for (int i = newVisibleStartIndex; i <= newVisibleEndIndex; i++)
{
if (i < 0)
{
continue;
}
if ((i < curVisibleStartIndex || i > curVisibleEndIndex))
{
RectTransform item = GetItemFromCache();
item.transform.SetParent(_scroll.content, false);
_items.Insert(i - newVisibleStartIndex, item);
bool selected;
if (IsMultiSelect)
{
selected = _selectedIndex == i;
}
else
{
selected = MultiSelectedIndexs.Contains(i);
}
OnChange(item, i);
if (!forceUpdate)
{
UpdateItemPos(item, i);
}
}
if (forceUpdate)
{
OnChange(_items[i - newVisibleStartIndex], i);
UpdateItemPos(_items[i - newVisibleStartIndex], i);
}
}
curVisibleStartIndex = newVisibleStartIndex;
curVisibleEndIndex = newVisibleEndIndex;
for (int i = curVisibleStartIndex; i <= curVisibleEndIndex; i++)
{
UpdateSelected(i);
}
if (onUpdateVisibleItem != null)
{
onUpdateVisibleItem(curVisibleStartIndex, curVisibleEndIndex);
}
}