public void ValidateRepeaterDefaults() { RunOnUIThread.Execute(() => { var repeater = new ItemsRepeater() { ItemsSource = Enumerable.Range(0, 10).Select(i => string.Format("Item #{0}", i)), }; Content = new ScrollAnchorProvider() { Width = 400, Height = 800, Content = new ScrollViewer { Content = repeater } }; Content.UpdateLayout(); for (int i = 0; i < 10; i++) { var element = repeater.TryGetElement(i); Verify.IsNotNull(element); Verify.AreEqual(string.Format("Item #{0}", i), ((TextBlock)element).Text); Verify.AreEqual(i, repeater.GetElementIndex(element)); } Verify.IsNull(repeater.TryGetElement(20)); }); }
private ItemsRepeater SetupRepeater(CustomItemsSource dataSource, ElementFactory elementFactory, ref ScrollViewer scrollViewer, VirtualizingLayout layout) { var repeater = new ItemsRepeater() { ItemsSource = dataSource, #if BUILD_WINDOWS ItemTemplate = (Windows.UI.Xaml.IElementFactory)elementFactory, #else ItemTemplate = elementFactory, #endif Layout = layout, VerticalCacheLength = 0, HorizontalCacheLength = 0 }; scrollViewer = new ScrollViewer { Content = repeater }; Content = new ScrollAnchorProvider() { Width = 200, Height = 200, Content = scrollViewer }; Content.UpdateLayout(); int realized = VerifyRealizedRange(repeater, dataSource); Verify.IsGreaterThan(realized, 0); return(repeater); }
public void ValidateElementToIndexMapping() { ItemsRepeater repeater = null; RunOnUIThread.Execute(() => { var elementFactory = new RecyclingElementFactory(); elementFactory.RecyclePool = new RecyclePool(); elementFactory.Templates["Item"] = (DataTemplate)XamlReader.Load( @"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'> <TextBlock Text='{Binding}' Height='50' /> </DataTemplate>"); repeater = new ItemsRepeater() { ItemsSource = Enumerable.Range(0, 10).Select(i => string.Format("Item #{0}", i)), #if BUILD_WINDOWS ItemTemplate = (Windows.UI.Xaml.IElementFactory)elementFactory, #else ItemTemplate = elementFactory, #endif // Default is StackLayout, so do not have to explicitly set. // Layout = new StackLayout(), }; Content = new ScrollAnchorProvider() { Width = 400, Height = 800, Content = new ScrollViewer { Content = repeater } }; Content.UpdateLayout(); for (int i = 0; i < 10; i++) { var element = repeater.TryGetElement(i); Verify.IsNotNull(element); Verify.AreEqual(string.Format("Item #{0}", i), ((TextBlock)element).Text); Verify.AreEqual(i, repeater.GetElementIndex(element)); } Verify.IsNull(repeater.TryGetElement(20)); }); }
public void ValidateRecycledElementOwnerAffinity() { RunOnUIThread.Execute(() => { ItemsRepeater repeater1 = null; ItemsRepeater repeater2 = null; const int numItems = 10; var dataCollection = new ObservableCollection <int>(Enumerable.Range(0, numItems)); const string recycleKey = "key"; var dataSource = MockItemsSource.CreateDataSource <int>(dataCollection, true); var layout = new StackLayout(); var recyclePool = new RecyclePool(); var itemTemplate = (DataTemplate)XamlReader.Load( @"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'> <TextBlock Text='{Binding}' /> </DataTemplate>"); repeater1 = new ItemsRepeater() { ItemsSource = dataSource, Layout = layout, #if BUILD_WINDOWS ItemTemplate = (Windows.UI.Xaml.IElementFactory) new RecyclingElementFactoryDerived() #else ItemTemplate = new RecyclingElementFactoryDerived() #endif { Templates = { { "key", itemTemplate } }, RecyclePool = recyclePool, SelectTemplateIdFunc = (object data, UIElement owner) => recycleKey } }; repeater2 = new ItemsRepeater() { ItemsSource = dataSource, Layout = layout, #if BUILD_WINDOWS ItemTemplate = (Windows.UI.Xaml.IElementFactory) new RecyclingElementFactoryDerived() #else ItemTemplate = new RecyclingElementFactoryDerived() #endif { Templates = { { "key", itemTemplate } }, RecyclePool = recyclePool, SelectTemplateIdFunc = (object data, UIElement owner) => recycleKey } }; var root = new StackPanel(); root.Children.Add(repeater1); root.Children.Add(repeater2); Content = new ScrollAnchorProvider() { Width = 400, Height = 400, Content = new ScrollViewer() { Content = root } }; Content.UpdateLayout(); Verify.AreEqual(numItems, VisualTreeHelper.GetChildrenCount(repeater1)); Verify.AreEqual(numItems, VisualTreeHelper.GetChildrenCount(repeater2)); // Throw all the elements into the recycle pool dataCollection.Clear(); Content.UpdateLayout(); for (int i = 0; i < numItems; i++) { var element1 = (FrameworkElement)recyclePool.TryGetElement(recycleKey, repeater1); Verify.AreSame(repeater1, element1.Parent); var element2 = (FrameworkElement)recyclePool.TryGetElement(recycleKey, repeater2); Verify.AreSame(repeater2, element2.Parent); } }); }