internal SelectionChangedEventArgs GetSelectionChangedEventArgs()
{
List <object> addedSelectedItems = new List <object>();
List <object> removedSelectedItems = new List <object>();
// Compare the old selected indexes with the current selection to determine which items
// have been added and removed since the last time this method was called
foreach (int newSlot in _selectedSlotsTable.GetIndexes())
{
object newItem = OwningGrid.DataConnection.GetDataItem(OwningGrid.RowIndexFromSlot(newSlot));
if (_oldSelectedSlotsTable.Contains(newSlot))
{
_oldSelectedSlotsTable.RemoveValue(newSlot);
_oldSelectedItemsCache.Remove(newItem);
}
else
{
addedSelectedItems.Add(newItem);
}
}
foreach (object oldItem in _oldSelectedItemsCache)
{
removedSelectedItems.Add(oldItem);
}
// The current selection becomes the old selection
_oldSelectedSlotsTable = _selectedSlotsTable.Copy();
_oldSelectedItemsCache = new List <object>(_selectedItemsCache);
return
(new SelectionChangedEventArgs(DataGrid.SelectionChangedEvent, removedSelectedItems, addedSelectedItems)
{
Source = OwningGrid
});
}
