/// <summary>
/// INotifyCollectionChanged.CollectionChanged handler for updating DataGrid.SelectedItems when the source list changes
/// </summary>
private static void UpdateDataGridsOnSourceCollectionChanged(object source, NotifyCollectionChangedEventArgs collectionChangedArgs)
{
DataGridsAndInitiatedSelectionChange sourceListInfo = DataGridMultipleSelection.selectedItemsSources[source.GetHashCode()];
// For each DataGrid that is bound to this list, is alive, and did not initate selection changes, update its selection
sourceListInfo.InitiatedSelectionChange = true;
IList sourceList = source as IList;
Debug.Assert(sourceList != null, "SelectedItemsSource must be of type IList");
DataGrid dataGrid = null;
foreach (WeakReference dataGridReference in sourceListInfo.BoundDataGridReferences)
{
if (dataGridReference.IsAlive && !DataGridMultipleSelection.GetInitiatedSelectionChange(dataGridReference.Target as DataGrid))
{
dataGrid = dataGridReference.Target as DataGrid;
UpdateDataGrid(dataGrid, sourceList, collectionChangedArgs);
}
}
sourceListInfo.InitiatedSelectionChange = false;
}
/// <summary>
/// DataGrid.SelectionChanged handler to update the source list given the SelectionChangedEventArgs
/// </summary>
private static void UpdateSourceListOnDataGridSelectionChanged(object sender, SelectionChangedEventArgs selectionChangedArgs)
{
DataGrid dataGrid = sender as DataGrid;
IList selectedItemsSource = DataGridMultipleSelection.GetSelectedItemsSource(dataGrid) as IList;
Debug.Assert(selectedItemsSource != null, "SelectedItemsSource must be of type IList");
// If the source list initiated the changes then don't pass the DataGrid's changes back down to the source list
if (!DataGridMultipleSelection.selectedItemsSources[selectedItemsSource.GetHashCode()].InitiatedSelectionChange)
{
DataGridMultipleSelection.SetInitiatedSelectionChange(dataGrid, true);
foreach (object removedItem in selectionChangedArgs.RemovedItems)
{
selectedItemsSource.Remove(removedItem);
}
foreach (object addedItem in selectionChangedArgs.AddedItems)
{
selectedItemsSource.Add(addedItem);
}
DataGridMultipleSelection.SetInitiatedSelectionChange(dataGrid, false);
}
}
