private static void IterateVisualChildren(DependencyObject parent, HwndContentControlAutomationPeer.IteratorCallback callback)
{
if (parent == null)
{
return;
}
int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
for (int childIndex = 0; childIndex < childrenCount; ++childIndex)
{
DependencyObject child = VisualTreeHelper.GetChild(parent, childIndex);
UIElement element = child as UIElement;
UIElement3D uiElement3D = child as UIElement3D;
AutomationPeer peerForElement1;
if (element != null && (peerForElement1 = UIElementAutomationPeer.CreatePeerForElement(element)) != null)
{
callback(peerForElement1);
}
else
{
AutomationPeer peerForElement2;
if (uiElement3D != null && (peerForElement2 = UIElement3DAutomationPeer.CreatePeerForElement((UIElement3D)child)) != null)
{
callback(peerForElement2);
}
else
{
HwndContentControlAutomationPeer.IterateVisualChildren(child, callback);
}
}
}
}
/// <inheritdoc />
protected override List <AutomationPeer> GetChildrenCore()
{
#pragma warning disable CS8619 // Nullability of reference types in value doesn't match target type.
return(this.Owner.VisualChildrenRecursive()
.Select(CreatePeerForElement)
.Where(x => x != null)
.ToList());
#pragma warning restore CS8619 // Nullability of reference types in value doesn't match target type.
AutomationPeer?CreatePeerForElement(DependencyObject o)
{
if (o is UIElement uiElement)
{
return(UIElementAutomationPeer.CreatePeerForElement(uiElement));
}
if (o is UIElement3D uiElement3D)
{
return(UIElement3DAutomationPeer.CreatePeerForElement(uiElement3D));
}
return(null);
}
}
#pragma warning restore CS8619 // Nullability of reference types in value doesn't match target type.
static AutomationPeer?CreatePeerForElement(DependencyObject o)
{
return(o switch
{
UIElement uiElement => UIElementAutomationPeer.CreatePeerForElement(uiElement),
UIElement3D uiElement3D => UIElement3DAutomationPeer.CreatePeerForElement(uiElement3D),
_ => null,
});
/// <inheritdoc />
protected override List <AutomationPeer> GetChildrenCore()
{
AutomationPeer CreatePeerForElement(DependencyObject o)
{
if (o is UIElement uiElement)
{
return(UIElementAutomationPeer.CreatePeerForElement(uiElement));
}
if (o is UIElement3D uiElement3D)
{
return(UIElement3DAutomationPeer.CreatePeerForElement(uiElement3D));
}
return(null);
}
return(this.Owner.VisualChildrenRecursive()
.Select(CreatePeerForElement)
.Where(x => x != null)
.ToList());
}
