internal DataGridGroupItemAutomationPeer GetOrCreateGroupItemPeer(object group)
{
DataGridGroupItemAutomationPeer peer = null;
if (group != null)
{
if (_groupItemPeers.ContainsKey(group))
{
peer = _groupItemPeers[group];
}
else
{
peer = new DataGridGroupItemAutomationPeer(group as CollectionViewGroup, this.OwningDataGrid);
_groupItemPeers.Add(group, peer);
}
DataGridRowGroupHeaderAutomationPeer rghPeer = peer.OwningRowGroupHeaderPeer;
if (rghPeer != null)
{
rghPeer.EventsSource = peer;
}
}
return(peer);
}
internal void PopulateGroupItemPeers()
{
Dictionary <object, DataGridGroupItemAutomationPeer> oldChildren = new Dictionary <object, DataGridGroupItemAutomationPeer>(_groupItemPeers);
_groupItemPeers.Clear();
if (this.OwningDataGrid.DataConnection.CollectionView != null &&
this.OwningDataGrid.DataConnection.CollectionView.CanGroup &&
this.OwningDataGrid.DataConnection.CollectionView.Groups != null &&
this.OwningDataGrid.DataConnection.CollectionView.Groups.Count > 0)
{
List <object> groups = new List <object>(this.OwningDataGrid.DataConnection.CollectionView.Groups);
while (groups.Count > 0)
{
CollectionViewGroup cvGroup = groups[0] as CollectionViewGroup;
groups.RemoveAt(0);
if (cvGroup != null)
{
// Add the group's peer to the collection
DataGridGroupItemAutomationPeer peer = null;
if (oldChildren.ContainsKey(cvGroup))
{
peer = oldChildren[cvGroup] as DataGridGroupItemAutomationPeer;
}
else
{
peer = new DataGridGroupItemAutomationPeer(cvGroup, this.OwningDataGrid);
}
if (peer != null)
{
DataGridRowGroupHeaderAutomationPeer rghPeer = peer.OwningRowGroupHeaderPeer;
if (rghPeer != null)
{
rghPeer.EventsSource = peer;
}
}
// This guards against the addition of duplicate items
if (!_groupItemPeers.ContainsKey(cvGroup))
{
_groupItemPeers.Add(cvGroup, peer);
}
// Look for any sub groups
if (!cvGroup.IsBottomLevel)
{
int position = 0;
foreach (object subGroup in cvGroup.Items)
{
groups.Insert(position, subGroup);
position++;
}
}
}
}
}
}
internal void UpdateRowGroupHeaderPeerEventsSource(DataGridRowGroupHeader header)
{
object group = header.RowGroupInfo.CollectionViewGroup;
DataGridRowGroupHeaderAutomationPeer peer = DataGridRowGroupHeaderAutomationPeer.FromElement(header) as DataGridRowGroupHeaderAutomationPeer;
if (peer != null && group != null && _groupItemPeers.ContainsKey(group))
{
peer.EventsSource = _groupItemPeers[group];
}
}