protected override UIElement GetElementCore(ElementFactoryGetArgs args)
{
int index = RepeaterTestHooks.GetElementFactoryElementIndex(args);
_recordedGetElementCalls.Add(new GetElementCallInfo(index, args.Parent));
return(GetElementFunc != null?GetElementFunc(index, args.Parent) : null);
}
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 static void OnRendering(object snd, object args)
{
bool budgetReached = ShouldYield();
if (!budgetReached && m_pendingWork.Count > 0)
{
// Sort in descending order of priority and work from the end of the list to avoid moving around during erase.
m_pendingWork.Sort((lhs, rhs) => lhs.Priority - rhs.Priority);
int currentIndex = (int)(m_pendingWork.Count) - 1;
do
{
m_pendingWork[currentIndex].InvokeWorkFunc();
m_pendingWork.RemoveAt(currentIndex);
} while (--currentIndex >= 0 && !ShouldYield());
}
if (m_pendingWork.Count == 0)
{
// No more pending work, unhook from rendering event since being hooked up will case wux to try to
// call the event at 60 frames per second
m_renderingToken = false;
Windows.UI.Xaml.Media.CompositionTarget.Rendering -= OnRendering;
RepeaterTestHooks.NotifyBuildTreeCompleted();
}
// Reset the timer so it snaps the time just before rendering
m_timer.Reset();
}
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);
});
});
}
protected override UIElement GetElementCore(ElementFactoryGetArgs context)
{
UIElement element = base.GetElementCore(context);
int index = RepeaterTestHooks.GetElementFactoryElementIndex(context);
if (GetElementFunc != null)
{
element = GetElementFunc(index, context.Parent, element);
}
if (!RealizedElementIndices.Contains(index))
{
_realizedElements.Add(element);
_realizedElementIndices.Add(index);
}
else if (ValidateElementIndices)
{
throw new InvalidOperationException("Cannot request an element that has already been realized.");
}
return(element);
}
public void ValidateRecycling()
{
RunOnUIThread.Execute(() =>
{
var elementFactory = new RecyclingElementFactory()
{
RecyclePool = new RecyclePool(),
};
elementFactory.Templates["even"] = (DataTemplate)XamlReader.Load(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='even' />
</DataTemplate>" );
elementFactory.Templates["odd"] = (DataTemplate)XamlReader.Load(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='odd' />
</DataTemplate>" );
elementFactory.SelectTemplateKey +=
delegate(RecyclingElementFactory sender, SelectTemplateEventArgs args)
{
args.TemplateKey = ((int)args.DataContext % 2 == 0) ? "even" : "odd";
};
const int numItems = 10;
ItemsRepeater repeater = new ItemsRepeater()
{
ItemsSource = Enumerable.Range(0, numItems),
ItemTemplate = elementFactory,
};
var context = (ElementFactoryGetArgs)RepeaterTestHooks.CreateRepeaterElementFactoryGetArgs();
context.Parent = repeater;
var clearContext = (ElementFactoryRecycleArgs)RepeaterTestHooks.CreateRepeaterElementFactoryRecycleArgs();
clearContext.Parent = repeater;
// Element0 is of type even, a new one should be created
context.Data = 0;
var element0 = elementFactory.GetElement(context);
Verify.IsNotNull(element0);
Verify.AreEqual("even", (element0 as TextBlock).Text);
clearContext.Element = element0;
elementFactory.RecycleElement(clearContext);
// Element1 is of type odd, a new one should be created
context.Data = 1;
var element1 = elementFactory.GetElement(context);
Verify.IsNotNull(element1);
Verify.AreNotSame(element0, element1);
Verify.AreEqual("odd", (element1 as TextBlock).Text);
clearContext.Element = element1;
elementFactory.RecycleElement(clearContext);
// Element0 should be recycled for element2
context.Data = 2;
var element2 = elementFactory.GetElement(context);
Verify.AreEqual("even", (element2 as TextBlock).Text);
Verify.AreSame(element0, element2);
// Element1 should be recycled for element3
context.Data = 3;
var element3 = elementFactory.GetElement(context);
Verify.AreEqual("odd", (element3 as TextBlock).Text);
Verify.AreSame(element1, element3);
});
}