/// <summary>
/// Primary method for IItemsRangeInfo interface
/// Is called when the list control's view is changed
/// </summary>
/// <param name="visibleRange">The range of items that are actually visible</param>
/// <param name="trackedItems">Additional set of ranges that the list is using, for example the buffer regions and focussed element</param>
public void RangesChanged(ItemIndexRange visibleRange, IReadOnlyList <ItemIndexRange> trackedItems)
{
#if TRACE_DATASOURCE
string s = string.Format("* RangesChanged fired: Visible {0}->{1}", visibleRange.FirstIndex, visibleRange.LastIndex);
foreach (ItemIndexRange r in trackedItems)
{
s += string.Format(" {0}->{1}", r.FirstIndex, r.LastIndex);
}
Debug.WriteLine(s);
#endif
// We know that the visible range is included in the broader range so don't need to hand it to the UpdateRanges call
// Update the cache of items based on the new set of ranges. It will callback for additional data if required
itemCache.UpdateRanges(trackedItems.ToArray());
}
// Called when an item (or items) are selected
public void SelectRange(ItemIndexRange range)
{
selection.Add(range);
selectionCache.UpdateRanges(selection.ToArray());
}
