internal DataGridCellItemAutomationPeer GetOrCreateCellItemPeer(DataGridColumn column)
{
DataGridCellItemAutomationPeer peer = null;
bool peerExists = _itemPeers.TryGetValue(column, out peer);
if (!peerExists || peer == null)
{
peer = new DataGridCellItemAutomationPeer(_item, column);
_itemPeers.Add(column, peer);
}
return(peer);
}
// This method is called from DataGrid.OnBeginningEdit/OnCommittingEdit/OnCancelingEdit
// Raises Invoked event when cell begin/cancel/commit edit
internal void RaiseAutomationCellInvokeEvents(DataGridColumn column, DataGridRow row)
{
DataGridItemAutomationPeer dataGridItemAutomationPeer = GetOrCreateItemPeer(row.Item);
if (dataGridItemAutomationPeer != null)
{
DataGridCellItemAutomationPeer cellPeer = dataGridItemAutomationPeer.GetOrCreateCellItemPeer(column);
if (cellPeer != null)
{
cellPeer.RaiseAutomationEvent(AutomationEvents.InvokePatternOnInvoked);
}
}
}
private void UpdateEventSource()
{
DataGridCell cell = (DataGridCell)Owner;
DataGrid dataGrid = cell.DataGridOwner;
if (dataGrid != null)
{
DataGridAutomationPeer dataGridAutomationPeer = CreatePeerForElement(dataGrid) as DataGridAutomationPeer;
if (dataGridAutomationPeer != null)
{
DataGridItemAutomationPeer itemAutomationPeer = dataGridAutomationPeer.GetOrCreateItemPeer(cell.DataContext);
if (itemAutomationPeer != null)
{
DataGridCellItemAutomationPeer cellItemAutomationPeer = itemAutomationPeer.GetOrCreateCellItemPeer(cell.Column);
this.EventsSource = cellItemAutomationPeer;
}
}
}
}
// This method is called from DataGrid.OnSelectedCellsChanged
// Raises the selection events when Cell selection changes
internal void RaiseAutomationCellSelectedEvent(SelectedCellsChangedEventArgs e)
{
// If the result of an AddToSelection or RemoveFromSelection is a single selected cell,
// then all we raise is the ElementSelectedEvent for single item
if (AutomationPeer.ListenerExists(AutomationEvents.SelectionItemPatternOnElementSelected) &&
this.OwningDataGrid.SelectedCells.Count == 1 && e.AddedCells.Count == 1)
{
DataGridCellItemAutomationPeer cellPeer = GetCellItemPeer(e.AddedCells[0]);
if (cellPeer != null)
{
cellPeer.RaiseAutomationEvent(AutomationEvents.SelectionItemPatternOnElementSelected);
}
}
else
{
int i;
if (AutomationPeer.ListenerExists(AutomationEvents.SelectionItemPatternOnElementAddedToSelection))
{
for (i = 0; i < e.AddedCells.Count; i++)
{
DataGridCellItemAutomationPeer cellPeer = GetCellItemPeer(e.AddedCells[i]);
if (cellPeer != null)
{
cellPeer.RaiseAutomationEvent(AutomationEvents.SelectionItemPatternOnElementAddedToSelection);
}
}
}
if (AutomationPeer.ListenerExists(AutomationEvents.SelectionItemPatternOnElementRemovedFromSelection))
{
for (i = 0; i < e.RemovedCells.Count; i++)
{
DataGridCellItemAutomationPeer cellPeer = GetCellItemPeer(e.RemovedCells[i]);
if (cellPeer != null)
{
cellPeer.RaiseAutomationEvent(AutomationEvents.SelectionItemPatternOnElementRemovedFromSelection);
}
}
}
}
}
internal List <AutomationPeer> GetCellItemPeers()
{
List <AutomationPeer> peers = new List <AutomationPeer>();
Dictionary <DataGridColumn, DataGridCellItemAutomationPeer> oldChildren = new Dictionary <DataGridColumn, DataGridCellItemAutomationPeer>(_itemPeers);
_itemPeers.Clear();
foreach (DataGridColumn column in this.OwningDataGrid.Columns)
{
DataGridCellItemAutomationPeer peer = null;
bool peerExists = oldChildren.TryGetValue(column, out peer);
if (!peerExists || peer == null)
{
peer = new DataGridCellItemAutomationPeer(_item, column);
}
peers.Add(peer);
_itemPeers.Add(column, peer);
}
return(peers);
}
IRawElementProviderSimple[] ISelectionProvider.GetSelection()
{
DataGrid dataGrid = this.OwningDataGrid;
if (dataGrid == null)
{
return(null);
}
int rowIndex = dataGrid.Items.IndexOf(_item);
// If row has selection
if (rowIndex > -1 && dataGrid.SelectedCellsInternal.Intersects(rowIndex))
{
List <IRawElementProviderSimple> selectedProviders = new List <IRawElementProviderSimple>();
for (int i = 0; i < this.OwningDataGrid.Columns.Count; i++)
{
// cell is selected
if (dataGrid.SelectedCellsInternal.Contains(rowIndex, i))
{
DataGridColumn column = dataGrid.ColumnFromDisplayIndex(i);
DataGridCellItemAutomationPeer peer = GetOrCreateCellItemPeer(column);
if (peer != null)
{
selectedProviders.Add(ProviderFromPeer(peer));
}
}
}
if (selectedProviders.Count > 0)
{
return(selectedProviders.ToArray());
}
}
return(null);
}
IRawElementProviderSimple IGridProvider.GetItem(int row, int column)
{
if (row >= 0 && row < this.OwningDataGrid.Items.Count &&
column >= 0 && column < this.OwningDataGrid.Columns.Count)
{
object item = this.OwningDataGrid.Items[row];
DataGridColumn dataGridColumn = this.OwningDataGrid.Columns[column];
this.OwningDataGrid.ScrollIntoView(item, dataGridColumn);
this.OwningDataGrid.UpdateLayout();
DataGridItemAutomationPeer itemPeer = this.GetOrCreateItemPeer(item);
if (itemPeer != null)
{
DataGridCellItemAutomationPeer cellItemPeer = itemPeer.GetOrCreateCellItemPeer(dataGridColumn);
if (cellItemPeer != null)
{
return(ProviderFromPeer(cellItemPeer));
}
}
}
return(null);
}
