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 this._selectedSlotsTable.GetIndexes())
{
object newItem = this.OwningGrid.DataConnection.GetDataItem(this.OwningGrid.RowIndexFromSlot(newSlot));
if (this._oldSelectedSlotsTable.Contains(newSlot))
{
this._oldSelectedSlotsTable.RemoveValue(newSlot);
this._oldSelectedItemsCache.Remove(newItem);
}
else
{
addedSelectedItems.Add(newItem);
}
}
foreach (object oldItem in this._oldSelectedItemsCache)
{
removedSelectedItems.Add(oldItem);
}
// The current selection becomes the old selection
this._oldSelectedSlotsTable = this._selectedSlotsTable.Copy();
this._oldSelectedItemsCache = new List <object>(this._selectedItemsCache);
return(new SelectionChangedEventArgs(removedSelectedItems, addedSelectedItems));
}
public DataGridSelectedItemsCollection(DataGrid owningGrid)
{
this.OwningGrid = owningGrid;
this._oldSelectedItemsCache = new List <object>();
this._oldSelectedSlotsTable = new IndexToValueTable <bool>();
this._selectedItemsCache = new List <object>();
this._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);
}
private static IEnumerable <object> GetSelectedItems(DataGrid owningGrid, IndexToValueTable <bool> selectedItemsTable)
{
Debug.Assert(owningGrid != null);
Debug.Assert(owningGrid.DataConnection != null);
Debug.Assert(selectedItemsTable != null);
DataGridDataConnection dataConnection = owningGrid.DataConnection;
foreach (int rowIndex in selectedItemsTable.GetIndexes())
{
Debug.Assert(rowIndex > -1);
yield return(dataConnection.GetDataItem(rowIndex));
}
}
public DataGridSelectedItemsCollection(DataGrid owningGrid)
{
this.OwningGrid = owningGrid;
this._selectedItemsTable = new IndexToValueTable <bool>();
}