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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using NUnit.Framework;
namespace Xamarin.Forms.Core.UnitTests
{
public class TestElement
: Element
{
public TestElement ()
{
internalChildren.CollectionChanged += OnChildrenChanged;
}
void OnChildrenChanged (object sender, NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null) {
foreach (Element element in e.NewItems)
OnChildAdded (element);
}
if (e.OldItems != null) {
foreach (Element element in e.OldItems)
OnChildRemoved (element);
}
}
public IList<Element> Children
{
get { return internalChildren; }
}
internal override ReadOnlyCollection<Element> LogicalChildrenInternal
{
get { return new ReadOnlyCollection<Element> (internalChildren); }
}
readonly ObservableCollection<Element> internalChildren = new ObservableCollection<Element> ();
}
[TestFixture]
public class ElementTests
: BaseTestFixture
{
[Test]
public void DescendantAddedLevel1 ()
{
var root = new TestElement();
var child = new TestElement();
bool added = false;
root.DescendantAdded += (sender, args) => {
Assert.That (args.Element, Is.SameAs (child));
added = true;
};
root.Children.Add (child);
}
[Test]
public void DescendantAddedLevel2 ()
{
var root = new TestElement();
var child = new TestElement();
root.Children.Add (child);
var child2 = new TestElement();
bool added = false;
root.DescendantAdded += (sender, args) => {
Assert.That (args.Element, Is.SameAs (child2));
added = true;
};
child.Children.Add (child2);
}
[Test]
public void DescendantAddedExistingChildren ()
{
var root = new TestElement();
var tier2 = new TestElement();
var child = new TestElement {
Children = {
tier2
}
};
bool tier1added = false;
bool tier2added = false;
root.DescendantAdded += (sender, args) => {
if (!tier1added)
tier1added = ReferenceEquals (child, args.Element);
if (!tier2added)
tier2added = ReferenceEquals (tier2, args.Element);
};
root.Children.Add (child);
Assert.That (tier1added, Is.True);
Assert.That (tier2added, Is.True);
}
[Test]
public void DescendantRemovedLevel1 ()
{
var root = new TestElement();
var child = new TestElement();
root.Children.Add (child);
bool removed = false;
root.DescendantRemoved += (sender, args) => {
Assert.That (args.Element, Is.SameAs (child));
removed = true;
};
root.Children.Remove (child);
}
[Test]
public void DescendantRemovedLevel2 ()
{
var root = new TestElement();
var child = new TestElement();
root.Children.Add (child);
var child2 = new TestElement();
child.Children.Add (child2);
bool removed = false;
root.DescendantRemoved += (sender, args) => {
Assert.That (args.Element, Is.SameAs (child2));
removed = true;
};
child.Children.Remove (child2);
}
[Test]
public void DescendantRemovedWithChildren ()
{
var root = new TestElement();
var tier2 = new TestElement();
var child = new TestElement {
Children = {
tier2
}
};
root.Children.Add (child);
bool tier1removed = false;
bool tier2removed = false;
root.DescendantRemoved += (sender, args) => {
if (!tier1removed)
tier1removed = ReferenceEquals (child, args.Element);
if (!tier2removed)
tier2removed = ReferenceEquals (tier2, args.Element);
};
root.Children.Remove (child);
Assert.That (tier1removed, Is.True);
Assert.That (tier2removed, Is.True);
}
}
}
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