public DataGridItemCellAutomationPeer( DataGridItemAutomationPeer itemAutomationPeer, ColumnBase column )
{
if( itemAutomationPeer == null )
throw new ArgumentNullException( "itemAutomationPeer" );
if( column == null )
throw new ArgumentNullException( "column" );
m_itemAutomationPeer = itemAutomationPeer;
m_column = column;
// Call the GetWrapperPeer since it will force the events of the wrapped peer to be rerooted to us.
AutomationPeer wrapperPeer = this.GetWrapperPeer();
}
private static void OnIsSelectedChanged(object sender, DependencyPropertyChangedEventArgs e)
{
DataGridRow row = (DataGridRow)sender;
bool isSelected = (bool)e.NewValue;
if (isSelected && !row.IsSelectable)
{
throw new InvalidOperationException(SR.Get(SRID.DataGridRow_CannotSelectRowWhenCells));
}
DataGrid grid = row.DataGridOwner;
if (grid != null && row.DataContext != null)
{
DataGridAutomationPeer gridPeer = UIElementAutomationPeer.FromElement(grid) as DataGridAutomationPeer;
if (gridPeer != null)
{
DataGridItemAutomationPeer rowItemPeer = gridPeer.GetOrCreateItemPeer(row.DataContext);
if (rowItemPeer != null)
{
rowItemPeer.RaisePropertyChangedEvent(
System.Windows.Automation.SelectionItemPatternIdentifiers.IsSelectedProperty,
(bool)e.OldValue,
isSelected);
}
}
}
// Update the header's IsRowSelected property
row.NotifyPropertyChanged(row, e, NotificationTarget.Rows | NotificationTarget.RowHeaders);
// This will raise the appropriate selection event, which will
// bubble to the DataGrid. The base class Selector code will listen
// for these events and will update SelectedItems as necessary.
row.RaiseSelectionChangedEvent(isSelected);
}
// Return automation peer corresponding to the row data item
internal DataGridItemAutomationPeer GetOrCreateItemPeer(object item)
{
DataGridItemAutomationPeer peer = null;
bool peerExists = _itemPeers.TryGetValue(item, out peer);
if (!peerExists || peer == null)
{
peer = new DataGridItemAutomationPeer(item, this.OwningDataGrid);
_itemPeers.Add(item, peer);
}
return peer;
}
// Return a list of automation peer corresponding to all rows in the DataGrid
private List<AutomationPeer> GetItemPeers()
{
List<AutomationPeer> peers = new List<AutomationPeer>();
Dictionary<object, DataGridItemAutomationPeer> oldChildren = new Dictionary<object, DataGridItemAutomationPeer>(_itemPeers);
_itemPeers.Clear();
foreach (object item in this.OwningDataGrid.Items)
{
DataGridItemAutomationPeer peer = null;
bool peerExists = oldChildren.TryGetValue(item, out peer);
if (!peerExists || peer == null)
{
peer = new DataGridItemAutomationPeer(item, this.OwningDataGrid);
}
peers.Add(peer);
_itemPeers.Add(item, peer);
}
return peers;
}
