///
protected override List <AutomationPeer> GetChildrenCore()
{
List <AutomationPeer> children = new List <AutomationPeer>(3);
// Step 1: Add row header if exists
AutomationPeer dataGridRowHeaderAutomationPeer = RowHeaderAutomationPeer;
if (dataGridRowHeaderAutomationPeer != null)
{
children.Add(dataGridRowHeaderAutomationPeer);
}
// Step 2: Add all cells
DataGridItemAutomationPeer itemPeer = this.EventsSource as DataGridItemAutomationPeer;
if (itemPeer != null)
{
children.AddRange(itemPeer.GetCellItemPeers());
}
// Step 3: Add DetailsPresenter last if exists
AutomationPeer dataGridDetailsPresenterAutomationPeer = DetailsPresenterAutomationPeer;
if (dataGridDetailsPresenterAutomationPeer != null)
{
children.Add(dataGridDetailsPresenterAutomationPeer);
}
return(children);
}
// This method is called from DataGrid.OnBeginningEdit/OnCommittingEdit/OnCancelingEdit
// Raises Invoked event when row begin/cancel/commit edit
internal void RaiseAutomationRowInvokeEvents(DataGridRow row)
{
DataGridItemAutomationPeer dataGridItemAutomationPeer = GetOrCreateItemPeer(row.Item);
if (dataGridItemAutomationPeer != null)
{
dataGridItemAutomationPeer.RaiseAutomationEvent(AutomationEvents.InvokePatternOnInvoked);
}
}
// 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 helper returning the automation peer coresponding to cellInfo
// Cell can be virtualized
private DataGridCellItemAutomationPeer GetCellItemPeer(DataGridCellInfo cellInfo)
{
if (cellInfo.IsValid)
{
DataGridItemAutomationPeer dataGridItemAutomationPeer = GetOrCreateItemPeer(cellInfo.Item);
if (dataGridItemAutomationPeer != null)
{
return(dataGridItemAutomationPeer.GetOrCreateCellItemPeer(cellInfo.Column));
}
}
return(null);
}
// 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);
}
// This method is called from DataGrid.OnSelectionChanged
// Raises the selection events when Items selection changes
internal void RaiseAutomationSelectionEvents(SelectionChangedEventArgs e)
{
int numSelected = this.OwningDataGrid.SelectedItems.Count;
int numAdded = e.AddedItems.Count;
// If the result of an AddToSelection or RemoveFromSelection is a single selected item,
// then all we raise is the ElementSelectedEvent for single item
if (AutomationPeer.ListenerExists(AutomationEvents.SelectionItemPatternOnElementSelected) &&
numSelected == 1 && numAdded == 1)
{
DataGridItemAutomationPeer peer = GetOrCreateItemPeer(this.OwningDataGrid.SelectedItem);
if (peer != null)
{
peer.RaiseAutomationEvent(AutomationEvents.SelectionItemPatternOnElementSelected);
}
}
else
{
int i;
if (AutomationPeer.ListenerExists(AutomationEvents.SelectionItemPatternOnElementAddedToSelection))
{
for (i = 0; i < e.AddedItems.Count; i++)
{
DataGridItemAutomationPeer peer = GetOrCreateItemPeer(e.AddedItems[i]);
if (peer != null)
{
peer.RaiseAutomationEvent(AutomationEvents.SelectionItemPatternOnElementAddedToSelection);
}
}
}
if (AutomationPeer.ListenerExists(AutomationEvents.SelectionItemPatternOnElementRemovedFromSelection))
{
for (i = 0; i < e.RemovedItems.Count; i++)
{
DataGridItemAutomationPeer peer = GetOrCreateItemPeer(e.RemovedItems[i]);
if (peer != null)
{
peer.RaiseAutomationEvent(AutomationEvents.SelectionItemPatternOnElementRemovedFromSelection);
}
}
}
}
}
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;
}
}
}
}
IRawElementProviderSimple[] ITableItemProvider.GetRowHeaderItems()
{
if (this.OwningDataGrid != null &&
(this.OwningDataGrid.HeadersVisibility & DataGridHeadersVisibility.Row) == DataGridHeadersVisibility.Row)
{
DataGridAutomationPeer dataGridAutomationPeer = UIElementAutomationPeer.CreatePeerForElement(this.OwningDataGrid) as DataGridAutomationPeer;
DataGridItemAutomationPeer dataGridItemAutomationPeer = dataGridAutomationPeer.GetOrCreateItemPeer(_item);
if (dataGridItemAutomationPeer != null)
{
AutomationPeer rowHeaderAutomationPeer = dataGridItemAutomationPeer.RowHeaderAutomationPeer;
if (rowHeaderAutomationPeer != null)
{
List <IRawElementProviderSimple> providers = new List <IRawElementProviderSimple>(1);
providers.Add(ProviderFromPeer(rowHeaderAutomationPeer));
return(providers.ToArray());
}
}
}
return(null);
}
// Return a list of automation peer corresponding to all rows in the DataGrid
// Called from DataGridRowsPresenterAutomationPeer.GetChildrenCore to populate its children
internal 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);
}
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);
}
private void AddSelectedCells(List <IRawElementProviderSimple> cellProviders)
{
if (cellProviders == null)
{
throw new ArgumentNullException("cellProviders");
}
// Add selected cells to selection
if (this.OwningDataGrid.SelectedCells != null)
{
foreach (DataGridCellInfo cellInfo in this.OwningDataGrid.SelectedCells)
{
DataGridItemAutomationPeer itemPeer = this.GetOrCreateItemPeer(cellInfo.Item);
if (itemPeer != null)
{
IRawElementProviderSimple provider = ProviderFromPeer(itemPeer.GetOrCreateCellItemPeer(cellInfo.Column));
if (provider != null)
{
cellProviders.Add(provider);
}
}
}
}
}
// Row virtualization does not allow us to enumerate all the row headers because
// Their visual and bindings cannot be predicted before the row is devirtualized
// This method will return only the list of devirtualized rows headers.
IRawElementProviderSimple[] ITableProvider.GetRowHeaders()
{
if ((this.OwningDataGrid.HeadersVisibility & DataGridHeadersVisibility.Row) == DataGridHeadersVisibility.Row)
{
List <IRawElementProviderSimple> providers = new List <IRawElementProviderSimple>();
foreach (object item in this.OwningDataGrid.Items)
{
DataGridItemAutomationPeer dataGridItemAutomationPeer = GetOrCreateItemPeer(item);
AutomationPeer rowHeaderAutomationPeer = dataGridItemAutomationPeer.RowHeaderAutomationPeer;
if (rowHeaderAutomationPeer != null)
{
providers.Add(ProviderFromPeer(rowHeaderAutomationPeer));
}
}
if (providers.Count > 0)
{
return(providers.ToArray());
}
}
return(null);
}
