/// <summary>
/// 设置开始render和结束render位置
/// </summary>
protected override IntVector2 getRenderListRange()
{
IntVector2 result = base.getRenderListRange();
if (_scrollTransform == null)
{
return(result);
}
int totalCount = _dataProvider.Count;
float posY = _layoutTransform.anchoredPosition.y; //相对pagelist的y
for (int i = 0; i < totalCount; i++)
{
IVerticalVO vo = (IVerticalVO)_dataProvider[i];
float iconHeight = vo.height;
posY -= iconHeight;
if (posY - iconHeight > 0)
{
result.x = i;
}
float scrollRectHeight = -_scrollTransform.rect.height;
if (posY + iconHeight < scrollRectHeight)
{
result.y = i;
break;
}
}
return(result);
}
protected virtual float getTotalLength()
{
float result = 0;
for (int i = 0, len = _dataProvider.Count; i < len; i++)
{
IVerticalVO vo = (IVerticalVO)_dataProvider[i];
result += vo.height;
}
return(result);
}
protected virtual float getPositionY(int index, float offset)
{
float result = offset;
for (int i = 0, len = _dataProvider.Count; i < len; i++)
{
if (i >= index)
{
break;
}
IVerticalVO vo = (IVerticalVO)_dataProvider[i];
result -= vo.height;
}
return(result);
}
