/// <summary>
/// Gets the scroll position in pixels from the start of the scroller based on the dataIndex
/// </summary>
/// <param name="dataIndex">The data index to look for</param>
/// <param name="insertPosition">Do we want the start or end of the cell view's position</param>
/// <returns></returns>
public float GetScrollPositionForDataIndex(int dataIndex, CellViewPositionEnum insertPosition)
{
return GetScrollPositionForCellViewIndex(loop ? _delegate.GetNumberOfCells(this) + dataIndex : dataIndex, insertPosition);
}
public void JumpToDataIndex(int dataIndex,
CellViewPositionEnum position = CellViewPositionEnum.Before,
bool useSpacing = true)
{
// if looping is on, we need to jump to the middle set of data, otherwise just use the dataIndex for the cellIndex
ScrollPosition = GetScrollPositionForDataIndex(dataIndex, position);
// if spacing is used, adjust the final position
if (useSpacing)
{
if (position == CellViewPositionEnum.Before)
ScrollPosition = _scrollPosition - spacing;
else
ScrollPosition = _scrollPosition + spacing;
}
}
/// <summary>
/// Gets the scroll position in pixels from the start of the scroller based on the cellViewIndex
/// </summary>
/// <param name="cellViewIndex">The cell index to look for. This is used instead of dataIndex in case of looping</param>
/// <param name="insertPosition">Do we want the start or end of the cell view's position</param>
/// <returns></returns>
public float GetScrollPositionForCellViewIndex(int cellViewIndex, CellViewPositionEnum insertPosition)
{
if (NumberOfCells == 0) return 0;
if (cellViewIndex == 0 && insertPosition == CellViewPositionEnum.Before)
{
return 0;
}
else
{
if (cellViewIndex < _cellViewOffsetArray.Count)
{
// the index is in the range of cell view offsets
if (insertPosition == CellViewPositionEnum.Before)
{
// return the previous cell view's offset + the spacing between cell views
return _cellViewOffsetArray[cellViewIndex - 1] + spacing + (scrollDirection == ScrollDirectionEnum.Vertical ? padding.top : padding.left);
}
else
{
// return the offset of the cell view (offset is after the cell)
return _cellViewOffsetArray[cellViewIndex] + (scrollDirection == ScrollDirectionEnum.Vertical ? padding.top : padding.left);
}
}
else
{
// get the start position of the last cell (the offset of the second to last cell)
return _cellViewOffsetArray[_cellViewOffsetArray.Count - 2];
}
}
}
