public virtual ITEMPOSITION TrackRow(int absRow, ref POSITIONCACHE cache)
{
TrackRowIgnoreOffsets(absRow, ref cache);
return cache.Position;
}
public override sealed ITEMPOSITION TrackRow(int absRow, ref POSITIONCACHE cache)
{
// UNDONE_CACHE: Never got this right in the prototype, work out later.
// May want to switch to an array of caches (one per column)
return TrackRow(absRow);
}
// This does not need a return value. cache.Position can always be
// considered the return value. This does not necessarily apply to
// TrackRows, where the position cache can apply to one level only.
public void TrackRowIgnoreOffsets(int absRow, ref POSITIONCACHE cache)
{
cache.Position = TrackRowIgnoreOffsets(absRow);
if (absRow != cache.LastAbsolute)
{
if (cache.LastAbsolute != VirtualTreeConstant.NullIndex)
{
var lastParentAbsolute = cache.Position.ParentAbsolute;
var lastLevel = cache.Position.Level;
var lastParent = cache.Position.ParentNode;
if ((lastParentAbsolute == VirtualTreeConstant.NullIndex)
||
(lastParentAbsolute < absRow &&
absRow < lastParentAbsolute + lastParent.FullCount))
{
cache.Position = lastParent.TrackRowIgnoreOffsets(absRow - lastParentAbsolute - 1);
// UNDONE_CACHE: Verify next two lines
cache.Position.Level += lastLevel;
cache.Position.ParentAbsolute += lastParentAbsolute + 1;
}
else
{
cache.Position = TrackRowIgnoreOffsets(absRow);
}
}
else
{
cache.Position = TrackRowIgnoreOffsets(absRow);
}
cache.LastAbsolute = absRow;
}
}