public void SetElement(VisualElement element)
{
var newPage = element as CarouselPage;
if (element != null && newPage == null)
{
throw new ArgumentException("element must be a CarouselPage");
}
CarouselPage oldPage = Element;
Element = newPage;
if (oldPage != null)
{
oldPage.SendDisappearing();
((INotifyCollectionChanged)oldPage.Children).CollectionChanged -= OnChildrenChanged;
oldPage.PropertyChanged -= OnElementPropertyChanged;
}
if (newPage != null)
{
if (_tracker == null)
{
_tracker = new BackgroundTracker <FlipView>(BackgroundProperty)
{
Control = this, Container = this
};
}
_tracker.Element = newPage;
// Adding Items triggers the SelectionChanged event,
// which will reset the CurrentPage unless we tell it to ignore.
_fromUpdate = true;
for (var i = 0; i < newPage.Children.Count; i++)
{
Items.Add(newPage.Children[i]);
}
_fromUpdate = false;
((INotifyCollectionChanged)newPage.Children).CollectionChanged += OnChildrenChanged;
newPage.PropertyChanged += OnElementPropertyChanged;
UpdateCurrentPage();
newPage.SendAppearing();
}
OnElementChanged(new ElementChangedEventArgs <CarouselPage>(oldPage, newPage));
if (!string.IsNullOrEmpty(Element?.AutomationId))
{
SetValue(Windows.UI.Xaml.Automation.AutomationProperties.AutomationIdProperty, Element.AutomationId);
}
}
public void SetElement(VisualElement element)
{
CarouselPage oldElement = _page;
_page = (CarouselPage)element;
_tracker = new BackgroundTracker <Control>(BackgroundProperty)
{
Model = _page, Element = this
};
DataContext = _page;
SelectionChanged += OnSelectionChanged;
OnPagesChanged(_page, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
_page.PagesChanged += OnPagesChanged;
_page.PropertyChanged += OnPropertyChanged;
Loaded += (sender, args) => _page.SendAppearing();
Unloaded += (sender, args) => _page.SendDisappearing();
OnElementChanged(new VisualElementChangedEventArgs(oldElement, element));
}