IAsyncAction MainPage::OnContainerContentChanging()

in PhotoEditor/MainPage.cpp [70:118]
37 lines of code
5 McCabe index (conditional complexity)

    IAsyncAction MainPage::OnContainerContentChanging(ListViewBase sender, ContainerContentChangingEventArgs args)
    {
        auto elementVisual = ElementCompositionPreview::GetElementVisual(args.ItemContainer());
        auto image = args.ItemContainer().ContentTemplateRoot().as<Image>();

        if (args.InRecycleQueue())
        {
            elementVisual.ImplicitAnimations(nullptr);

            image.Source(nullptr);
        }

        if (args.Phase() == 0)
        {
            //Add implicit animation to each visual.
            elementVisual.ImplicitAnimations(m_elementImplicitAnimation);

            args.RegisterUpdateCallback([&](auto sender, auto args)
            {
                OnContainerContentChanging(sender, args);
            });

            args.Handled(true);
        }

        if (args.Phase() == 1)
        {
            // It's phase 1, so show this item's image.
            image.Opacity(100);

            auto item = unbox_value<PhotoEditor::Photo>(args.Item());
            Photo* impleType = get_self<Photo>(item);

            try
            {
                auto thumbnail = co_await impleType->GetImageThumbnailAsync();
                image.Source(thumbnail);
            }
            catch (winrt::hresult_error)
            {
                // File could be corrupt, or it might have an image file
                // extension, but not really be an image file.
                BitmapImage bitmapImage{};
                Uri uri{ image.BaseUri().AbsoluteUri(), L"Assets/StoreLogo.png" };
                bitmapImage.UriSource(uri);
                image.Source(bitmapImage);
            }
        }
    }