public async Task ValidateReyclingElementFactoryWithNoTemplate()
{
await RunOnUIThread.ExecuteAsync(async() =>
{
var elementFactory = new RecyclingElementFactoryDerived()
{
RecyclePool = new RecyclePool()
};
Verify.Throws <
#if HAS_UNO // Uno throws a more specific exception
InvalidOperationException
#else
COMException
#endif
>(delegate
{
var context = (ElementFactoryGetArgs)RepeaterTestHooks.CreateRepeaterElementFactoryGetArgs();
context.Parent = null;
context.Data = 0;
elementFactory.GetElement(context);
});
});
}
public async Task ValidateRecyclingElementFactoryWithSingleTemplate()
{
await RunOnUIThread.ExecuteAsync(async() =>
{
var itemTemplate = (DataTemplate)XamlReader.Load(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='uninitialized' />
</DataTemplate>" );
ItemsRepeater repeater = null;
const int numItems = 10;
var elementFactory = new RecyclingElementFactoryDerived()
{
Templates = { { "key", itemTemplate } },
RecyclePool = new RecyclePool(),
GetElementFunc = delegate(int index, UIElement owner, UIElement elementFromBase)
{
((TextBlock)elementFromBase).Text = index.ToString();
return(elementFromBase);
},
ClearElementFunc = delegate(UIElement element, UIElement owner)
{
((TextBlock)element).Text = "uninitialized";
},
};
elementFactory.SelectTemplateKey += delegate(RecyclingElementFactory sender, SelectTemplateEventArgs args)
{
Verify.Fail("SelectTemplateKey event should not be raised when using a single template");
};
Content = CreateAndInitializeRepeater
(
itemsSource: Enumerable.Range(0, numItems).Select(i => string.Format("Item #{0}", i)),
elementFactory: elementFactory,
layout: new StackLayout(),
repeater: ref repeater
);
await UpdateLayoutWithWaitAsync();
Verify.AreEqual(numItems, VisualTreeHelper.GetChildrenCount(repeater));
for (int i = 0; i < numItems; i++)
{
var element = (TextBlock)repeater.TryGetElement(i);
Verify.AreEqual(i.ToString(), element.Text);
}
});
}
public void ValidateReyclingElementFactoryWithNoTemplate()
{
RunOnUIThread.Execute(() =>
{
var elementFactory = new RecyclingElementFactoryDerived()
{
RecyclePool = new RecyclePool()
};
Verify.Throws <COMException>(delegate
{
var context = (ElementFactoryGetArgs)RepeaterTestHooks.CreateRepeaterElementFactoryGetArgs();
context.Parent = null;
context.Data = 0;
elementFactory.GetElement(context);
});
});
}
public void ValidateSentinelsDuringInserts()
{
RunOnUIThread.Execute(() =>
{
var dataSource = new CustomItemsSource(Enumerable.Range(0, 10).ToList());
int getElementCallCount = 0;
int recycleElementCallCount = 0;
var elementFactory = new RecyclingElementFactoryDerived()
{
Templates = { { "key", SharedHelpers.GetDataTemplate("<TextBlock Text='{Binding}' Height='100' />") } },
RecyclePool = new RecyclePool(),
GetElementFunc = (int index, UIElement owner, UIElement elementFromBase) =>
{
getElementCallCount++;
return(elementFromBase);
},
ClearElementFunc = (UIElement element, UIElement owner) => recycleElementCallCount++,
ValidateElementIndices = false
};
var repeater = SetupRepeater(dataSource, elementFactory);
getElementCallCount = 0;
recycleElementCallCount = 0;
Log.Comment("Insert in realized range: Inserting 100 items at index 1");
dataSource.Insert(index: 1, count: 100, reset: false);
repeater.UpdateLayout();
var realized = VerifyRealizedRange(repeater, dataSource);
Verify.IsGreaterThan(realized, 0);
Verify.IsLessThan(getElementCallCount, 6);
Verify.IsLessThan(recycleElementCallCount, 6);
});
}
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);
}
});
}
