int FindCurrentSectionPosition(int fromPosition)
{
IListAdapter adapter = Adapter;
if (fromPosition >= adapter.Count)
{
return(-1); // dataset has changed, no candidate
}
if (adapter.GetType().IsAssignableFrom(typeof(ISectionIndexer)))
{
// try fast way by asking section indexer
ISectionIndexer indexer = (ISectionIndexer)adapter;
int sectionPosition = indexer.GetSectionForPosition(fromPosition);
int itemPosition = indexer.GetPositionForSection(sectionPosition);
int typeView = adapter.GetItemViewType(itemPosition);
if (IsItemViewTypePinned(adapter, typeView))
{
return(itemPosition);
} // else, no luck
}
// try slow way by looking through to the next section item above
for (int position = fromPosition; position >= 0; position--)
{
int viewType = adapter.GetItemViewType(position);
if (IsItemViewTypePinned(adapter, viewType))
{
return(position);
}
}
return(-1); // no candidate found
}
public int GetPositionForSection(int section)
{
return(m_SectionIndexer.GetPositionForSection(section));
}