public void ValidateChildRemovedFromParentWhenOwnerIsDifferent()
{
RunOnUIThread.Execute(() =>
{
var element = new Button();
const string key1 = "Key1";
const string key2 = "Key2";
RecyclePool pool = new RecyclePool();
var parent1 = new StackPanel();
var child1 = new Button();
var child2 = new Button();
parent1.Children.Add(child1);
parent1.Children.Add(child2);
pool.PutElement(child1, key1);
pool.PutElement(child2, key2);
var parent2 = new StackPanel();
// Recycle the second child for a different parent. It should be disconnected
var recycled1 = (FrameworkElement)pool.TryGetElement(key2, parent2);
Verify.IsNull(recycled1.Parent);
var recycled2 = (FrameworkElement)pool.TryGetElement(key1, parent2);
Verify.IsNull(recycled2.Parent);
});
}
public void ValidateElementsHaveCorrectKeys()
{
RunOnUIThread.Execute(() =>
{
var element = new Button();
const string buttonKey = "ButtonKey";
const string textBlockKey = "TextBlockKey";
const string stackPanelKey = "StackPanelKey";
RecyclePool pool = new RecyclePool();
pool.PutElement(new Button(), buttonKey);
pool.PutElement(new TextBlock(), textBlockKey);
pool.PutElement(new StackPanel(), stackPanelKey);
pool.PutElement(new Button(), buttonKey);
pool.PutElement(new TextBlock(), textBlockKey);
pool.PutElement(new StackPanel(), stackPanelKey);
pool.PutElement(new Button(), buttonKey);
pool.PutElement(new TextBlock(), textBlockKey);
pool.PutElement(new StackPanel(), stackPanelKey);
Verify.IsNotNull((Button)pool.TryGetElement(buttonKey));
Verify.IsNotNull((Button)pool.TryGetElement(buttonKey));
Verify.IsNotNull((Button)pool.TryGetElement(buttonKey));
Verify.IsNull(pool.TryGetElement(buttonKey));
Verify.IsNotNull((TextBlock)pool.TryGetElement(textBlockKey));
Verify.IsNotNull((TextBlock)pool.TryGetElement(textBlockKey));
Verify.IsNotNull((TextBlock)pool.TryGetElement(textBlockKey));
Verify.IsNull(pool.TryGetElement(textBlockKey));
Verify.IsNotNull((StackPanel)pool.TryGetElement(stackPanelKey));
Verify.IsNotNull((StackPanel)pool.TryGetElement(stackPanelKey));
Verify.IsNotNull((StackPanel)pool.TryGetElement(stackPanelKey));
Verify.IsNull(pool.TryGetElement(stackPanelKey));
Verify.Throws <COMException>(delegate
{
pool.PutElement(new Button(), null, null);
});
Verify.Throws <COMException>(delegate
{
pool.PutElement(new Button(), buttonKey, new Button() /* not a panel */);
});
Verify.Throws <COMException>(delegate
{
pool.TryGetElement(null, null);
});
});
}
public void ValidateOwnershipWithStackPanel()
{
RunOnUIThread.Execute(() =>
{
RecyclePool pool = new RecyclePool();
var owner = new StackPanel();
var child = new Button();
owner.Children.Add(child);
pool.PutElement(child, "Key", owner);
var recycled = pool.TryGetElement("Key", owner);
Verify.AreSame(child, recycled);
Verify.AreEqual(0, owner.Children.IndexOf(child));
});
}
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);
}
});
}