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
});
}
public DataGridSelectedItemsCollection(DataGrid owningGrid)
{
OwningGrid = owningGrid;
_oldSelectedItemsCache = new List <object>();
_oldSelectedSlotsTable = new IndexToValueTable <bool>();
_selectedItemsCache = new List <object>();
_selectedSlotsTable = new IndexToValueTable <bool>();
}
/// <summary>
/// Returns a copy of this IndexToValueTable
/// </summary>
/// <returns>copy of this IndexToValueTable</returns>
public IndexToValueTable <T> Copy()
{
IndexToValueTable <T> copy = new IndexToValueTable <T>();
foreach (Range <T> range in this._list)
{
copy._list.Add(range.Copy());
}
return(copy);
}
