internal static bool InvalidateAutomationPeer(
DependencyObject o,
out UIElement e,
out ContentElement ce,
out UIElement3D e3d)
{
e = null;
ce = null;
e3d = null;
AutomationPeer ap = null;
e = o as UIElement;
if (e != null)
{
if (e.HasAutomationPeer == true)
{
ap = e.GetAutomationPeer();
}
}
else
{
ce = o as ContentElement;
if (ce != null)
{
if (ce.HasAutomationPeer == true)
{
ap = ce.GetAutomationPeer();
}
}
else
{
e3d = o as UIElement3D;
if (e3d != null)
{
if (e3d.HasAutomationPeer == true)
{
ap = e3d.GetAutomationPeer();
}
}
}
}
if (ap != null)
{
ap.InvalidateAncestorsRecursive();
// Check for parent being non-null while stopping as we don't want to stop in between due to peers not connected to AT
// those peers sometimes gets created to serve for various patterns.
// e.g: ScrollViewAutomationPeer for Scroll Pattern in case of ListBox.
if (ap.GetParent() != null)
{
return(false);
}
}
return(true);
}