public void ValidateStackLayoutDisabledVirtualizationWithItemsRepeater()
{
RunOnUIThread.Execute(() =>
{
var repeater = new ItemsRepeater();
var stackLayout = new StackLayout();
stackLayout.DisableVirtualization = true;
repeater.Layout = stackLayout;
repeater.ItemsSource = Enumerable.Range(0, 10);
repeater.ItemTemplate = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<Button Content='{Binding}' Height='100' />
</DataTemplate>");
var scrollViewer = new ScrollViewer()
{
Content = repeater
};
scrollViewer.Height = 100;
Content = scrollViewer;
Content.UpdateLayout();
for (int i = 0; i < repeater.ItemsSourceView.Count; i++)
{
var child = repeater.TryGetElement(i) as Button;
Verify.IsNotNull(child);
}
});
}
private ItemsRepeater SetupRepeater(object dataSource, string itemContent = @"<Button Content='{Binding}' Height='100' />")
{
VirtualizingLayout layout = null;
RunOnUIThread.Execute(() => layout = new StackLayout());
ScrollViewer scrollViewer = null;
return(SetupRepeater(dataSource, layout, itemContent, out scrollViewer));
}
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.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='{Binding}' />
</DataTemplate>");
repeater1 = new ItemsRepeater()
{
ItemsSource = dataSource,
Layout = layout,
ItemTemplate = new RecyclingElementFactoryDerived()
{
Templates = { { "key", itemTemplate } },
RecyclePool = recyclePool,
SelectTemplateIdFunc = (object data, UIElement owner) => recycleKey
}
};
repeater2 = new ItemsRepeater()
{
ItemsSource = dataSource,
Layout = layout,
ItemTemplate = new RecyclingElementFactoryDerived()
{
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 ItemsRepeaterScrollHost()
{
Width = 400,
Height = 400,
ScrollViewer = 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);
}
});
}
