private Span GetRelativeSpan()
{
Debug.Assert(IsContainer && !VariantByContainer);
var originOffset = GridTrackOwner.GetGridSpan(Template.RowRange).StartTrack.StartOffset;
return(new Span(GridTrack.StartOffset - originOffset, GridTrack.EndOffset - originOffset));
}
private double GetContainerViewsLength(int count)
{
Debug.Assert(count >= 0 && count <= MaxContainerCount);
if (count == 0)
{
return(0);
}
return(VariantByContainer
? VariantLengthHandler.GetContainerViewsLength(GridTrack, count)
: GridTrackOwner.GetGridSpan(Template.RowRange).MeasuredLength *count);
}
private Span GetExtentSpan()
{
Debug.Assert(GridTrackOwner == ScrollableManager.GridTracksMain);
Debug.Assert(!IsContainer);
if (GridTrack.IsHead)
{
return(new Span(GridTrack.StartOffset, GridTrack.EndOffset));
}
Debug.Assert(GridTrack.IsTail);
var delta = GetContainerViewsLength(MaxContainerCount);
if (!GridTrackOwner.VariantByContainer && MaxContainerCount > 0)
{
delta -= GridTrackOwner.GetMeasuredLength(Template.ContainerRange);
}
return(new Span(GridTrack.StartOffset + delta, GridTrack.EndOffset + delta));
}