///
protected override List <AutomationPeer> GetChildrenCore()
{
GroupItem owner = (GroupItem)Owner;
ItemsControl itemsControl = ItemsControl.ItemsControlFromItemContainer(Owner);
if (itemsControl != null)
{
ItemsControlAutomationPeer itemsControlAP = itemsControl.CreateAutomationPeer() as ItemsControlAutomationPeer;
if (itemsControlAP != null)
{
List <AutomationPeer> children = new List <AutomationPeer>();
bool useNetFx472CompatibleAccessibilityFeatures = AccessibilitySwitches.UseNetFx472CompatibleAccessibilityFeatures;
if (!useNetFx472CompatibleAccessibilityFeatures && owner.Expander != null)
{
_expanderPeer = UIElementAutomationPeer.CreatePeerForElement(owner.Expander);
if (_expanderPeer != null)
{
_expanderPeer.EventsSource = this;
// Call GetChildren so the Expander's toggle button updates its EventsSource as well
_expanderPeer.GetChildren();
}
}
Panel itemsHost = owner.ItemsHost;
if (itemsHost == null)
{
if (_expanderPeer == null)
{
return(null);
}
else
{
children.Add(_expanderPeer);
return(children);
}
}
IList childItems = itemsHost.Children;
ItemPeersStorage <ItemAutomationPeer> addedChildren = new ItemPeersStorage <ItemAutomationPeer>();
foreach (UIElement child in childItems)
{
if (!((MS.Internal.Controls.IGeneratorHost)itemsControl).IsItemItsOwnContainer(child))
{
UIElementAutomationPeer peer = child.CreateAutomationPeer() as UIElementAutomationPeer;
if (peer != null)
{
children.Add(peer);
if (useNetFx472CompatibleAccessibilityFeatures)
{
//
// The AncestorsInvalid check is meant so that we do this call to invalidate the
// GroupItemPeers containing the realized item peers only when we arrive here from an
// UpdateSubtree call because that call does not otherwise descend into parts of the tree
// that have their children invalid as an optimization.
//
if (itemsControlAP.RecentlyRealizedPeers.Count > 0 && this.AncestorsInvalid)
{
GroupItemAutomationPeer groupItemPeer = peer as GroupItemAutomationPeer;
if (groupItemPeer != null)
{
groupItemPeer.InvalidateGroupItemPeersContainingRecentlyRealizedPeers(itemsControlAP.RecentlyRealizedPeers);
}
}
}
else
{
//
// The AncestorsInvalid check is meant so that we do this call to invalidate the
// GroupItemPeers only when we arrive here from an
// UpdateSubtree call because that call does not otherwise descend into parts of the tree
// that have their children invalid as an optimization.
//
if (this.AncestorsInvalid)
{
GroupItemAutomationPeer groupItemPeer = peer as GroupItemAutomationPeer;
if (groupItemPeer != null)
{
// invalidate all GroupItemAP children, so
// that the top-level ItemsControlAP's
// ItemPeers collection is repopulated.
groupItemPeer.AncestorsInvalid = true;
groupItemPeer.ChildrenValid = true;
}
}
}
}
}
else
{
object item = itemsControl.ItemContainerGenerator.ItemFromContainer(child);
// ItemFromContainer can return {UnsetValue} if we're in a re-entrant
// call while the generator is in the midst of unhooking the container.
// Ignore such children.
if (item == DependencyProperty.UnsetValue)
{
continue;
}
// try to reuse old peer if it exists either in Current AT or in WeakRefStorage of Peers being sent to Client
ItemAutomationPeer peer = useNetFx472CompatibleAccessibilityFeatures
? itemsControlAP.ItemPeers[item]
: itemsControlAP.ReusablePeerFor(item);
peer = itemsControlAP.ReusePeerForItem(peer, item);
if (peer != null)
{
if (useNetFx472CompatibleAccessibilityFeatures)
{
//
// We have now connected the realized peer to its actual parent. Hence the cache can be cleared
//
int realizedPeerIndex = itemsControlAP.RecentlyRealizedPeers.IndexOf(peer);
if (realizedPeerIndex >= 0)
{
itemsControlAP.RecentlyRealizedPeers.RemoveAt(realizedPeerIndex);
}
}
}
else
{
peer = itemsControlAP.CreateItemAutomationPeerInternal(item);
}
//perform hookup so the events sourced from wrapper peer are fired as if from the data item
if (peer != null)
{
AutomationPeer wrapperPeer = peer.GetWrapperPeer();
if (wrapperPeer != null)
{
wrapperPeer.EventsSource = peer;
if (peer.ChildrenValid && peer.Children == null && this.AncestorsInvalid)
{
peer.AncestorsInvalid = true;
wrapperPeer.AncestorsInvalid = true;
}
}
}
//protection from indistinguishable items - for example, 2 strings with same value
//this scenario does not work in ItemsControl however is not checked for.
// Our parent's ItemPeerStorage collection may not have been cleared,
// this would cause us to report 0 children, if the peer is already in the collection
// check its parent, if it has been set to us, we should add it to the return collection,
// but only if we haven't added a peer for this item during this GetChildrenCore call.
bool itemMissingPeerInGlobalStorage = itemsControlAP.ItemPeers[item] == null;
if (peer != null && (itemMissingPeerInGlobalStorage ||
(peer.GetParent() == this && addedChildren[item] == null)))
{
children.Add(peer);
addedChildren[item] = peer;
if (itemMissingPeerInGlobalStorage)
{
itemsControlAP.ItemPeers[item] = peer;
}
}
}
}
return(children);
}
}
return(null);
}
/// <summary>Gets the collection of child elements of the <see cref="T:System.Windows.Controls.GroupItem" /> that is associated with this <see cref="T:System.Windows.Automation.Peers.GroupItemAutomationPeer" />. This method is called by <see cref="M:System.Windows.Automation.Peers.AutomationPeer.GetChildren" />.</summary>
/// <returns>The collection of child elements.</returns>
// Token: 0x060026E9 RID: 9961 RVA: 0x000B8530 File Offset: 0x000B6730
protected override List <AutomationPeer> GetChildrenCore()
{
GroupItem groupItem = (GroupItem)base.Owner;
ItemsControl itemsControl = ItemsControl.ItemsControlFromItemContainer(base.Owner);
if (itemsControl != null)
{
ItemsControlAutomationPeer itemsControlAutomationPeer = itemsControl.CreateAutomationPeer() as ItemsControlAutomationPeer;
if (itemsControlAutomationPeer != null)
{
Panel itemsHost = groupItem.ItemsHost;
if (itemsHost == null)
{
return(null);
}
IList children = itemsHost.Children;
List <AutomationPeer> list = new List <AutomationPeer>(children.Count);
ItemPeersStorage <ItemAutomationPeer> itemPeersStorage = new ItemPeersStorage <ItemAutomationPeer>();
bool useNetFx472CompatibleAccessibilityFeatures = AccessibilitySwitches.UseNetFx472CompatibleAccessibilityFeatures;
if (!useNetFx472CompatibleAccessibilityFeatures && groupItem.Expander != null)
{
this._expanderPeer = UIElementAutomationPeer.CreatePeerForElement(groupItem.Expander);
if (this._expanderPeer != null)
{
this._expanderPeer.EventsSource = this;
this._expanderPeer.GetChildren();
}
}
foreach (object obj in children)
{
UIElement uielement = (UIElement)obj;
if (!((IGeneratorHost)itemsControl).IsItemItsOwnContainer(uielement))
{
UIElementAutomationPeer uielementAutomationPeer = uielement.CreateAutomationPeer() as UIElementAutomationPeer;
if (uielementAutomationPeer != null)
{
list.Add(uielementAutomationPeer);
if (useNetFx472CompatibleAccessibilityFeatures)
{
if (itemsControlAutomationPeer.RecentlyRealizedPeers.Count > 0 && this.AncestorsInvalid)
{
GroupItemAutomationPeer groupItemAutomationPeer = uielementAutomationPeer as GroupItemAutomationPeer;
if (groupItemAutomationPeer != null)
{
groupItemAutomationPeer.InvalidateGroupItemPeersContainingRecentlyRealizedPeers(itemsControlAutomationPeer.RecentlyRealizedPeers);
}
}
}
else if (this.AncestorsInvalid)
{
GroupItemAutomationPeer groupItemAutomationPeer2 = uielementAutomationPeer as GroupItemAutomationPeer;
if (groupItemAutomationPeer2 != null)
{
groupItemAutomationPeer2.AncestorsInvalid = true;
groupItemAutomationPeer2.ChildrenValid = true;
}
}
}
}
else
{
object obj2 = itemsControl.ItemContainerGenerator.ItemFromContainer(uielement);
if (obj2 != DependencyProperty.UnsetValue)
{
ItemAutomationPeer itemAutomationPeer = useNetFx472CompatibleAccessibilityFeatures ? itemsControlAutomationPeer.ItemPeers[obj2] : itemsControlAutomationPeer.ReusablePeerFor(obj2);
itemAutomationPeer = itemsControlAutomationPeer.ReusePeerForItem(itemAutomationPeer, obj2);
if (itemAutomationPeer != null)
{
if (useNetFx472CompatibleAccessibilityFeatures)
{
int num = itemsControlAutomationPeer.RecentlyRealizedPeers.IndexOf(itemAutomationPeer);
if (num >= 0)
{
itemsControlAutomationPeer.RecentlyRealizedPeers.RemoveAt(num);
}
}
}
else
{
itemAutomationPeer = itemsControlAutomationPeer.CreateItemAutomationPeerInternal(obj2);
}
if (itemAutomationPeer != null)
{
AutomationPeer wrapperPeer = itemAutomationPeer.GetWrapperPeer();
if (wrapperPeer != null)
{
wrapperPeer.EventsSource = itemAutomationPeer;
if (itemAutomationPeer.ChildrenValid && itemAutomationPeer.Children == null && this.AncestorsInvalid)
{
itemAutomationPeer.AncestorsInvalid = true;
wrapperPeer.AncestorsInvalid = true;
}
}
}
bool flag = itemsControlAutomationPeer.ItemPeers[obj2] == null;
if (itemAutomationPeer != null && (flag || (itemAutomationPeer.GetParent() == this && itemPeersStorage[obj2] == null)))
{
list.Add(itemAutomationPeer);
itemPeersStorage[obj2] = itemAutomationPeer;
if (flag)
{
itemsControlAutomationPeer.ItemPeers[obj2] = itemAutomationPeer;
}
}
}
}
}
return(list);
}
}
return(null);
}