internal DataGridItemAutomationPeer FindOrCreateItemAutomationPeer(object item, int index)
{
DataGridItemAutomationPeer itemAutomationPeer = m_dataChildren[item] as DataGridItemAutomationPeer;
if (itemAutomationPeer == null)
{
itemAutomationPeer = this.CreateItemAutomationPeer(item, index);
}
else
{
itemAutomationPeer.SetIndex(index);
}
// Force EventsSource to be updated
itemAutomationPeer.GetWrapperPeer();
return(itemAutomationPeer);
}
protected override List <AutomationPeer> GetChildrenCore()
{
if (m_dataGridContext == null)
{
return(null);
}
if (m_oldColumnCount == -1)
{
m_oldColumnCount = m_dataGridContext.VisibleColumns.Count;
m_dataGridContext.Columns.VisibleColumnsUpdated += new EventHandler(Columns_VisibleColumnsUpdated);
}
CustomItemContainerGenerator itemGenerator = m_dataGridContext.CustomItemContainerGenerator;
IEnumerable items;
int itemsCount;
bool itemsIsAllItems = false;
// The way Microsoft check if we are called by an automation that support Virtualization.
if ((ItemContainerPatternIdentifiers.Pattern != null) && (m_dataGridControl.ItemsHost is DataGridItemsHost))
{
List <object> realizedItems = itemGenerator.GetRealizedDataItems();
items = realizedItems;
itemsCount = realizedItems.Count;
}
else
{
CollectionView viewItems = m_dataGridContext.Items;
items = viewItems;
itemsCount = viewItems.Count;
itemsIsAllItems = true;
}
Hashtable oldDataChildren = m_dataChildren;
Hashtable oldHeaderFooterChildren = m_headerFooterChildren;
// Get header count
HeadersFootersGeneratorNode headerNode = itemGenerator.Header;
int headersCount = (headerNode == null) ? 0 : headerNode.ItemCount;
// Get footer count
HeadersFootersGeneratorNode footerNode = itemGenerator.Footer;
int footersCount = (footerNode == null) ? 0 : footerNode.ItemCount;
int childrenCount = headersCount + footersCount;
if (m_parentDataGridContext == null)
{
// Add the fixed header / footer count to the children
Panel fixedPanel = m_dataGridControl.FixedHeadersHostPanel;
if (fixedPanel != null)
{
childrenCount += fixedPanel.Children.Count;
}
fixedPanel = m_dataGridControl.FixedFootersHostPanel;
if (fixedPanel != null)
{
childrenCount += fixedPanel.Children.Count;
}
}
ReadOnlyObservableCollection <object> groups = m_dataGridContext.Items.Groups;
if (groups != null)
{
// Add the group count to the children
childrenCount += groups.Count;
}
else
{
childrenCount += itemsCount;
}
m_dataChildren = new Hashtable(itemsCount);
m_headerFooterChildren = new Hashtable(headersCount + footersCount);
if (childrenCount == 0)
{
return(null);
}
List <AutomationPeer> list = new List <AutomationPeer>(childrenCount);
this.AddChildrenHeaders(headerNode, oldHeaderFooterChildren, list);
if (groups != null)
{
CustomItemContainerGenerator customItemContainerGenerator = m_dataGridContext.CustomItemContainerGenerator;
DataGridGroupAutomationPeer peer;
itemsCount = groups.Count;
for (int i = 0; i < itemsCount; i++)
{
CollectionViewGroup collectionViewGroup = groups[i] as CollectionViewGroup;
if (collectionViewGroup != null)
{
Group uiGroup =
customItemContainerGenerator.GetGroupFromCollectionViewGroup(null, collectionViewGroup);
if (uiGroup != null)
{
peer = uiGroup.CreateAutomationPeer() as DataGridGroupAutomationPeer;
if (peer != null)
{
list.Add(peer);
}
}
}
}
}
else
{
int index = 0;
foreach (object item in ( IEnumerable )items)
{
DataGridItemAutomationPeer itemAutomationPeer =
oldDataChildren[item] as DataGridItemAutomationPeer;
if (itemAutomationPeer == null)
{
if (itemsIsAllItems)
{
itemAutomationPeer = this.CreateItemAutomationPeer(item, index);
index++;
}
else
{
itemAutomationPeer = this.CreateItemAutomationPeer(item, -1);
}
}
else
{
if (itemsIsAllItems)
{
itemAutomationPeer.SetIndex(index);
index++;
}
else
{
itemAutomationPeer.SetIndex(-1);
}
}
// Force EventsSource to be updated
itemAutomationPeer.GetWrapperPeer();
if (m_dataChildren[item] == null)
{
list.Add(itemAutomationPeer);
m_dataChildren[item] = itemAutomationPeer;
}
}
}
this.AddChildrenFooters(footerNode, oldHeaderFooterChildren, list);
return(list);
}