public void ValidateCorrectSizeWhenEmptyDataTemplateInSelector()
{
RunOnUIThread.Execute(() =>
{
var dataTemplateOdd = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='{Binding}' Height='30' Width='50' />
</DataTemplate>");
var dataTemplateEven = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' />");
ItemsRepeater repeater = null;
const int numItems = 10;
var selector = new MySelector()
{
TemplateOdd = dataTemplateOdd,
TemplateEven = dataTemplateEven
};
repeater = new ItemsRepeater()
{
ItemTemplate = selector,
Layout = new StackLayout(),
ItemsSource = Enumerable.Range(0, numItems)
};
repeater.VerticalAlignment = VerticalAlignment.Top;
repeater.HorizontalAlignment = HorizontalAlignment.Left;
Content = repeater;
Content.UpdateLayout();
Verify.AreEqual(numItems, VisualTreeHelper.GetChildrenCount(repeater));
for (int i = 0; i < numItems; i++)
{
var element = (FrameworkElement)repeater.TryGetElement(i);
if (i % 2 == 0)
{
Verify.AreEqual(element.Height, 0);
}
else
{
Verify.AreEqual(element.Height, 30);
}
}
Verify.AreEqual(5 * 30, repeater.ActualHeight);
// ItemsRepeater stretches page, so actual width is width of page and not 50
//Verify.AreEqual(50, repeater.ActualWidth);
repeater.ItemsSource = null;
Content.UpdateLayout();
});
}
public void ValidateDataTemplateSelectorAsItemTemplate()
{
RunOnUIThread.Execute(() =>
{
var dataTemplateOdd = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='{Binding}' Height='30' />
</DataTemplate>");
var dataTemplateEven = (DataTemplate)XamlReader.Parse(
@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>
<TextBlock Text='{Binding}' Height='40' />
</DataTemplate>");
ItemsRepeater repeater = null;
const int numItems = 10;
var selector = new MySelector()
{
TemplateOdd = dataTemplateOdd,
TemplateEven = dataTemplateEven
};
Content = CreateAndInitializeRepeater
(
itemsSource: Enumerable.Range(0, numItems),
elementFactory: selector,
layout: new StackLayout(),
repeater: ref repeater
);
Content.UpdateLayout();
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);
Verify.AreEqual(i % 2 == 0 ? 40 : 30, element.Height);
}
repeater.ItemsSource = null;
Content.UpdateLayout();
// In versions below RS5 we faked the recycling behaivor on data template
// so we can get to the recycle pool that we addded internally in ItemsRepeater.
//if (PlatformConfiguration.IsOSVersionLessThan(OSVersion.Redstone5))
{
// All the created items should be in the recycle pool now.
var oddPool = RecyclePool.GetPoolInstance(dataTemplateOdd);
var oddElements = GetAllElementsFromPool(oddPool);
Verify.AreEqual(5, oddElements.Count);
foreach (var element in oddElements)
{
Verify.AreEqual(30, ((TextBlock)element).Height);
}
var evenPool = RecyclePool.GetPoolInstance(dataTemplateEven);
var evenElements = GetAllElementsFromPool(evenPool);
Verify.AreEqual(5, evenElements.Count);
foreach (var element in evenElements)
{
Verify.AreEqual(40, ((TextBlock)element).Height);
}
}
});
}
