diff options
Diffstat (limited to 'Xamarin.Forms.Platform.WinRT/CarouselViewRenderer.cs')
| -rw-r--r-- | Xamarin.Forms.Platform.WinRT/CarouselViewRenderer.cs | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/Xamarin.Forms.Platform.WinRT/CarouselViewRenderer.cs b/Xamarin.Forms.Platform.WinRT/CarouselViewRenderer.cs deleted file mode 100644 index f29909df..00000000 --- a/Xamarin.Forms.Platform.WinRT/CarouselViewRenderer.cs +++ /dev/null @@ -1,227 +0,0 @@ -using System; -using System.Collections.Specialized; -using System.ComponentModel; -using System.Linq; -using Windows.UI.Xaml; -using Windows.UI.Xaml.Controls; -using Windows.UI.Xaml.Media; -using WFlipView = Windows.UI.Xaml.Controls.FlipView; -using WBinding = Windows.UI.Xaml.Data.Binding; -using WApp = Windows.UI.Xaml.Application; -using WSize = Windows.Foundation.Size; -using WDataTemplate = Windows.UI.Xaml.DataTemplate; - -#if WINDOWS_UWP - -namespace Xamarin.Forms.Platform.UWP -#else - -namespace Xamarin.Forms.Platform.WinRT -#endif -{ - public class CarouselViewRenderer : ViewRenderer<CarouselView, FrameworkElement> - { - WFlipView _flipView; - - bool _leftAdd; - - ICarouselViewController Controller - { - get - { - return Element; - } - } - - protected override void OnElementChanged(ElementChangedEventArgs<CarouselView> e) - { - base.OnElementChanged(e); - - if (e.OldElement != null) - { - _flipView.SelectionChanged -= SelectionChanged; - _flipView.ItemsSource = null; - Element.CollectionChanged -= CollectionChanged; - } - - if (e.NewElement != null) - { - if (_flipView == null) - { - _flipView = new FlipView - { - IsSynchronizedWithCurrentItem = false, - ItemTemplate = (WDataTemplate)WApp.Current.Resources["ItemTemplate"] - }; - } - - _flipView.ItemsSource = Element.ItemsSource; - _flipView.SelectedIndex = Element.Position; - _flipView.SelectionChanged += SelectionChanged; - Element.CollectionChanged += CollectionChanged; - } - - if (_flipView != Control) - SetNativeControl(_flipView); - } - - protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e) - { - if (e.PropertyName == "Position" && _flipView.SelectedIndex != Element.Position) - { - if (!_leftAdd) - _flipView.SelectedIndex = Element.Position; - _leftAdd = false; - } - - base.OnElementPropertyChanged(sender, e); - } - - void CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) - { - Controller.SendSelectedPositionChanged(_flipView.SelectedIndex); - - switch (e.Action) - { - case NotifyCollectionChangedAction.Add: - if (e.NewStartingIndex <= Element.Position) - { - _leftAdd = true; - int position = Element.Position + e.NewItems.Count; - PositionChanged(position); - } - break; - - case NotifyCollectionChangedAction.Move: - break; - - case NotifyCollectionChangedAction.Remove: - if (Controller.Count == 0) - throw new InvalidOperationException("CarouselView must retain a least one item."); - - if (e.OldStartingIndex < Element.Position) - PositionChanged(Element.Position - e.OldItems.Count); - break; - - case NotifyCollectionChangedAction.Replace: - break; - - case NotifyCollectionChangedAction.Reset: - break; - - default: - throw new Exception($"Enum value '{(int)e.Action}' is not a member of NotifyCollectionChangedAction enumeration."); - } - } - - void PositionChanged(int position) - { - if (!_leftAdd) - _flipView.SelectedIndex = position; - Element.Position = position; - Controller.SendSelectedPositionChanged(position); - } - - void SelectionChanged(object sender, SelectionChangedEventArgs e) - { - object[] addedItems = e.AddedItems.ToArray(); - object[] removedItems = e.RemovedItems.ToArray(); - - object addedItem = addedItems.SingleOrDefault(); - if (addedItem != null) - { - PositionChanged(_flipView.SelectedIndex); - Controller.SendSelectedItemChanged(addedItems.Single()); - } - } - } - - public class ItemControl : ContentControl - { - CarouselView _carouselView; - object _item; - View _view; - - public ItemControl() - { - DataContextChanged += OnDataContextChanged; - } - - CarouselView CarouselView => LoadCarouselView(); - - IItemViewController Controller => CarouselView; - - protected override WSize ArrangeOverride(WSize finalSize) - { - _view.Layout(new Rectangle(0, 0, CarouselView.Width, CarouselView.Height)); - return base.ArrangeOverride(finalSize); - } - - protected override WSize MeasureOverride(WSize availableSize) - { - LoadCarouselView(); - - if (_item != null) - { - SetDataContext(_item); - _item = null; - } - - return base.MeasureOverride(availableSize); - } - - CarouselView LoadCarouselView() - { - if (_carouselView != null) - return _carouselView; - - DependencyObject parent = VisualTreeHelper.GetParent(this); - CarouselViewRenderer renderer = default(CarouselViewRenderer); - - do - { - if (parent == null) - return null; - - renderer = parent as CarouselViewRenderer; - if (renderer != null) - break; - - parent = VisualTreeHelper.GetParent(parent); - } while (true); - - _carouselView = renderer.Element; - return _carouselView; - } - - void OnDataContextChanged(FrameworkElement sender, DataContextChangedEventArgs args) - { - object item = args.NewValue; - - if (_carouselView != null) - SetDataContext(item); - - else if (item != null) - _item = item; - } - - void SetDataContext(object item) - { - // type item - object type = Controller.GetItemType(item); - - // activate item - _view = Controller.CreateView(type); - _view.Parent = CarouselView; - _view.Layout(new Rectangle(0, 0, CarouselView.Width, CarouselView.Height)); - - // render item - IVisualElementRenderer renderer = Platform.CreateRenderer(_view); - Platform.SetRenderer(_view, renderer); - Content = renderer; - - // bind item - Controller.BindView(_view, item); - } - } -}
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