public void When_TemplateRootIsOwnContainer()
{
var count = 0;
var panel = new StackPanel();
var SUT = new MyItemsControl()
{
ItemsPanelRoot = panel,
ItemTemplate = new DataTemplate(() =>
{
count++;
return(new MyCustomItemContainer()
{
MyValue = 42
});
}),
Template = new ControlTemplate(() => new ItemsPresenter()),
};
SUT.ApplyTemplate();
SUT.ItemsSource = new object[]
{
42
};
var container = SUT.ContainerFromIndex(0) as MyCustomItemContainer;
Assert.IsNotNull(container);
Assert.IsTrue(container.IsGeneratedContainer);
Assert.IsFalse(container.ContentTemplateRoot is MyCustomItemContainer);
Assert.AreEqual(42, container.DataContext);
}
public void When_ObservableCollection()
{
var count = 0;
var panel = new StackPanel();
var itemsPresenter = new MyItemsControl();
var itemTemplate = new DataTemplate(() =>
{
count++;
return(new Border());
});
var SUT = new MyItemsControl()
{
ItemsPanelRoot = panel,
ItemTemplate = itemTemplate,
Template = new ControlTemplate(() => new ItemsPresenter()),
};
SUT.ApplyTemplate();
Assert.AreEqual(0, count);
var collection = new ObservableCollection <int>();
SUT.ItemsSource = collection;
Assert.AreEqual(0, count);
collection.Add(1);
Assert.AreEqual(1, count);
collection.Add(42);
Assert.AreEqual(2, count);
collection.Add(43);
Assert.AreEqual(3, count);
collection.RemoveAt(0);
Assert.AreEqual(3, count);
collection[0] = 44;
Assert.AreEqual(FeatureConfiguration.FrameworkTemplate.IsPoolingEnabled ? 3 : 4, count);
}
private static void OnItemsSourcePropertyChanged(
DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
MyItemsControl ic = obj as MyItemsControl;
if (ic != null)
{
var oldCollectionChanged = e.OldValue as INotifyCollectionChanged;
var newCollectionChanged = e.NewValue as INotifyCollectionChanged;
if (oldCollectionChanged != null)
{
oldCollectionChanged.CollectionChanged -= ic.OnItemsCollectionChanged;
}
if (newCollectionChanged != null)
{
newCollectionChanged.CollectionChanged += ic.OnItemsCollectionChanged;
// in addition to adding a CollectionChanged handler
// any already existing collection elements should be processed here
}
}
}