// Provides Peer if exist in Weak Reference Storage
private DateTimeAutomationPeer GetPeerFromWeakRefStorage(DateTimeCalendarModePair dateTimeCalendarModePairKey)
{
DateTimeAutomationPeer returnPeer = null;
WeakReference weakRefEP = null;
WeakRefElementProxyStorage.TryGetValue(dateTimeCalendarModePairKey, out weakRefEP);
if (weakRefEP != null)
{
ElementProxy provider = weakRefEP.Target as ElementProxy;
if (provider != null)
{
returnPeer = PeerFromProvider(provider as IRawElementProviderSimple) as DateTimeAutomationPeer;
if (returnPeer == null)
{
WeakRefElementProxyStorage.Remove(dateTimeCalendarModePairKey);
}
}
else
{
WeakRefElementProxyStorage.Remove(dateTimeCalendarModePairKey);
}
}
return(returnPeer);
}
// UpdateChildrenIntenal is called with ItemsInvalidateLimit to ensure we don’t fire unnecessary structure change events when items are just scrolled in/out of view in case of
// virtualized controls.
override internal IDisposable UpdateChildren()
{
UpdateChildrenInternal(AutomationInteropProvider.ItemsInvalidateLimit);
WeakRefElementProxyStorage.PurgeWeakRefCollection();
return(AccessibilitySwitches.UseNetFx472CompatibleAccessibilityFeatures
? null
: new UpdateChildrenHelper(this));
}
// Called by DateTimeAutomationPeer
internal void AddProxyToWeakRefStorage(WeakReference wr, DateTimeAutomationPeer dateTimePeer)
{
DateTimeCalendarModePair key = new DateTimeCalendarModePair(dateTimePeer.Date, dateTimePeer.ButtonMode);
if (GetPeerFromWeakRefStorage(key) == null)
{
WeakRefElementProxyStorage.Add(key, wr);
}
}
//
override internal void UpdateChildren()
{
// To ensure that the Updation of children should be initiated from DataPeer so as to have the right parent value stored for children
TreeViewDataItemAutomationPeer dataPeer = EventsSource as TreeViewDataItemAutomationPeer;
if (dataPeer != null)
{
dataPeer.UpdateChildrenInternal(AutomationInteropProvider.ItemsInvalidateLimit);
}
else
{
UpdateChildrenInternal(AutomationInteropProvider.ItemsInvalidateLimit);
}
WeakRefElementProxyStorage.PurgeWeakRefCollection();
}
// Provides Peer if exist in Weak Reference Storage
private DataGridCellItemAutomationPeer GetPeerFromWeakRefStorage(object column)
{
DataGridCellItemAutomationPeer returnPeer = null;
WeakReference weakRefEP = WeakRefElementProxyStorage[column];
if (weakRefEP != null)
{
ElementProxy provider = weakRefEP.Target as ElementProxy;
if (provider != null)
{
returnPeer = PeerFromProvider(provider as IRawElementProviderSimple) as DataGridCellItemAutomationPeer;
if (returnPeer == null)
{
WeakRefElementProxyStorage.Remove(column);
}
}
else
{
WeakRefElementProxyStorage.Remove(column);
}
}
return(returnPeer);
}
// Provides Peer if exist in Weak Reference Storage
internal ItemAutomationPeer GetPeerFromWeakRefStorage(object item)
{
ItemAutomationPeer returnPeer = null;
WeakReference weakRefEP = WeakRefElementProxyStorage[item];
if (weakRefEP != null)
{
ElementProxy provider = weakRefEP.Target as ElementProxy;
if (provider != null)
{
returnPeer = PeerFromProvider(provider as IRawElementProviderSimple) as ItemAutomationPeer;
if (returnPeer == null)
{
WeakRefElementProxyStorage.Remove(item);
}
}
else
{
WeakRefElementProxyStorage.Remove(item);
}
}
return(returnPeer);
}
// UpdateChildrenIntenal is called with ItemsInvalidateLimit to ensure we don’t fire unnecessary structure change events when items are just scrolled in/out of view in case of
// virtualized controls.
override internal void UpdateChildren()
{
UpdateChildrenInternal(AutomationInteropProvider.ItemsInvalidateLimit);
WeakRefElementProxyStorage.PurgeWeakRefCollection();
}