public static async Task <Element> FindTemplatedParentAsync(Element element)
{
if (element.RealParent is Application)
{
return(null);
}
var skipCount = 0;
element = await GetRealParentAsync(element);
while (!Application.IsApplicationOrNull(element))
{
var controlTemplated = element as IControlTemplated;
if (controlTemplated?.ControlTemplate != null)
{
if (skipCount == 0)
{
return(element);
}
skipCount--;
}
if (element is ContentPresenter)
{
skipCount++;
}
element = await GetRealParentAsync(element);
}
return(null);
}
protected override void OnParentSet()
{
if (!Application.IsApplicationOrNull(RealParent) && !(RealParent is Page))
{
throw new InvalidOperationException("Parent of a Page must also be a Page");
}
base.OnParentSet();
}
Page AncestorToRoot(Page ancestor)
{
Page result = ancestor;
while (!Application.IsApplicationOrNull(result.RealParent))
{
result = (Page)result.RealParent;
}
return(result);
}
internal static IEnumerable <Element> GetParentsPath(this Element self)
{
Element current = self;
while (!Application.IsApplicationOrNull(current.RealParent))
{
current = current.RealParent;
yield return(current);
}
}
static void OnFlyoutBehaviorChanged(BindableObject bindable, object oldValue, object newValue)
{
var element = (Element)bindable;
while (!Application.IsApplicationOrNull(element))
{
if (element is Shell shell)
shell.NotifyFlyoutBehaviorObservers();
element = element.Parent;
}
}
static void OnColorValueChanged(BindableObject bindable, object oldValue, object newValue)
{
var item = (Element)bindable;
var source = item;
while (!Application.IsApplicationOrNull(item))
{
if (item is IShellController shell)
{
shell.AppearanceChanged(source, true);
return;
}
item = item.Parent;
}
}