maui-linux/Xamarin.Forms.Core.UnitTests/ContentViewUnitTest.cs

using System;
using System.Collections.Generic;
using System.Linq;

using NUnit.Framework;

namespace Xamarin.Forms.Core.UnitTests
{
	[TestFixture]
	public class ContentViewUnitTests : BaseTestFixture
	{
		[SetUp]
		public override void Setup()
		{
			base.Setup ();
			Device.PlatformServices = new MockPlatformServices ();
		}

		[TearDown]
		public override void TearDown()
		{
			base.TearDown ();
			Device.PlatformServices = null;
		}

		[Test]
		public void TestConstructor ()
		{
			var contentView = new ContentView ();

			Assert.Null (contentView.Content);
			Assert.AreEqual (Color.Default, contentView.BackgroundColor);
			Assert.AreEqual (new Thickness (0), contentView.Padding);
		}

		[Test]
		public void TestSetChild ()
		{
			var contentView = new ContentView ();

			var child1 = new Label ();

			bool added = false;

			contentView.ChildAdded += (sender, e) => added = true;

			contentView.Content = child1;

			Assert.True (added);
			Assert.AreEqual (child1, contentView.Content);

			added = false;
			contentView.Content = child1;

			Assert.False (added);
		}

		[Test]
		public void TestReplaceChild ()
		{
			var contentView = new ContentView ();

			var child1 = new Label ();
			var child2 = new Label ();

			contentView.Content = child1;

			bool removed = false;
			bool added = false;

			contentView.ChildRemoved += (sender, e) => removed = true;
			contentView.ChildAdded += (sender, e) => added = true;

			contentView.Content = child2;

			Assert.True (removed);
			Assert.True (added);
			Assert.AreEqual (child2, contentView.Content);
		}

		[Test]
		public void TestFrameLayout ()
		{
			View child;

			var contentView = new ContentView {
				Padding = new Thickness (10),
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 200,
					IsPlatformEnabled = true
				},
				IsPlatformEnabled = true,
			};

			Assert.AreEqual (new Size (120, 220), contentView.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity).Request);

			contentView.Layout (new Rectangle (0, 0, 300, 300));

			Assert.AreEqual (new Rectangle (10, 10, 280, 280), child.Bounds);
		}

		[Test]
		public void WidthRequest ()
		{
			View child;

			var contentView = new ContentView {
				Padding = new Thickness (10),
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 200,
					IsPlatformEnabled = true
				},
				IsPlatformEnabled = true,
				WidthRequest = 20
			};

			Assert.AreEqual (new Size (40, 220), contentView.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity).Request);
		}

		[Test]
		public void HeightRequest ()
		{
			View child;

			var contentView = new ContentView {
				Padding = new Thickness (10),
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 200,
					IsPlatformEnabled = true,
				},
				IsPlatformEnabled = true,
				HeightRequest = 20
			};

			Assert.AreEqual (new Size (120, 40), contentView.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity).Request);
		}

		[Test]
		public void LayoutVerticallyCenter()
		{
			View child;

			var contentView = new ContentView {
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 100,
					IsPlatformEnabled = true,
					VerticalOptions = LayoutOptions.Center
				},
				IsPlatformEnabled = true,
			};

			contentView.Layout (new Rectangle(0,0, 200, 200));

			Assert.AreEqual (new Rectangle (0, 50, 200, 100), child.Bounds);
		}

		[Test]
		public void LayoutVerticallyBegin()
		{
			View child;

			var contentView = new ContentView {
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 100,
					IsPlatformEnabled = true,
					VerticalOptions = LayoutOptions.Start
				},
				IsPlatformEnabled = true,
			};

			contentView.Layout (new Rectangle(0,0, 200, 200));

			Assert.AreEqual (new Rectangle (0, 0, 200, 100), child.Bounds);
		}

		[Test]
		public void LayoutVerticallyEnd()
		{
			View child;

			var contentView = new ContentView {
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 100,
					IsPlatformEnabled = true,
					VerticalOptions = LayoutOptions.End
				},
				IsPlatformEnabled = true,
			};

			contentView.Layout (new Rectangle(0,0, 200, 200));

			Assert.AreEqual (new Rectangle (0, 100, 200, 100), child.Bounds);
		}

		[Test]
		public void LayoutHorizontallyCenter()
		{
			View child;

			var contentView = new ContentView {
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 100,
					IsPlatformEnabled = true,
					HorizontalOptions = LayoutOptions.Center
				},
				IsPlatformEnabled = true,
			};

			contentView.Layout (new Rectangle(0,0, 200, 200));

			Assert.AreEqual (new Rectangle (50, 0, 100, 200), child.Bounds);
		}

		[Test]
		public void LayoutHorizontallyBegin()
		{
			View child;

			var contentView = new ContentView {
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 100,
					IsPlatformEnabled = true,
					HorizontalOptions = LayoutOptions.Start
				},
				IsPlatformEnabled = true,
			};

			contentView.Layout (new Rectangle(0,0, 200, 200));

			Assert.AreEqual (new Rectangle (0, 0, 100, 200), child.Bounds);
		}

		[Test]
		public void LayoutHorizontallyEnd()
		{
			View child;

			var contentView = new ContentView {
				Content = child = new View {
					WidthRequest = 100,
					HeightRequest = 100,
					IsPlatformEnabled = true,
					HorizontalOptions = LayoutOptions.End
				},
				IsPlatformEnabled = true,
			};

			contentView.Layout (new Rectangle(0,0, 200, 200));

			Assert.AreEqual (new Rectangle (100, 0, 100, 200), child.Bounds);
		}

		[Test]
		public void NullTemplateDirectlyHosts ()
		{
			// order of setting properties carefully picked to emulate running on real backend

			var contentView = new ContentView ();
			var child = new View ();

			contentView.Content = child;

			Assert.AreEqual (child, ((IElementController)contentView).LogicalChildren[0]);
		}

		class SimpleTemplate : StackLayout
		{
			public SimpleTemplate ()
			{
				Children.Add (new Label ());
				Children.Add (new ContentPresenter ());
			}
		}


		[Test]
		public void TemplateInflates ()
		{
			var contentView = new ContentView ();

			contentView.ControlTemplate = new ControlTemplate (typeof (SimpleTemplate));

			Assert.That (((IElementController)contentView).LogicalChildren[0], Is.TypeOf<SimpleTemplate> ());
		}

		[Test]
		public void PacksContent ()
		{
			var contentView = new ContentView ();
			var child = new View ();

			contentView.ControlTemplate = new ControlTemplate (typeof (SimpleTemplate));
			contentView.Content = child;

			Assume.That (((IElementController)contentView).LogicalChildren[0], Is.TypeOf<SimpleTemplate> ());
			Assert.That (contentView.Descendants (), Contains.Item (child));
		}

		[Test]
		public void DoesNotInheritBindingContextToTemplate ()
		{
			var contentView = new ContentView ();
			var child = new View ();

			contentView.ControlTemplate = new ControlTemplate (typeof (SimpleTemplate));
			contentView.Content = child;

			var bc = "Test";
			contentView.BindingContext = bc;

			Assert.AreNotEqual (bc, ((IElementController)contentView).LogicalChildren[0].BindingContext);
			Assert.IsNull (((IElementController)contentView).LogicalChildren[0].BindingContext);
		}

		[Test]
		public void ContentDoesGetBindingContext ()
		{
			var contentView = new ContentView ();
			var child = new View ();

			contentView.ControlTemplate = new ControlTemplate (typeof (SimpleTemplate));
			contentView.Content = child;

			var bc = "Test";
			contentView.BindingContext = bc;

			Assert.AreEqual (bc, child.BindingContext);
		}

		[Test]
		public void ContentParentIsNotInsideTempalte ()
		{
			var contentView = new ContentView ();
			var child = new View ();

			contentView.ControlTemplate = new ControlTemplate (typeof (SimpleTemplate));
			contentView.Content = child;

			Assert.AreEqual (contentView, child.Parent);
		}

		[Test]
		public void NonTemplatedContentInheritsBindingContext ()
		{
			var contentView = new ContentView ();
			var child = new View ();
			
			contentView.Content = child;
			contentView.BindingContext = "Foo";

			Assert.AreEqual ("Foo", child.BindingContext);
		}

        [Test]
        public void ContentView_should_have_the_InternalChildren_correctly_when_Content_changed()
        {
            var sut = new ContentView();
            IList<Element> internalChildren = ((IControlTemplated)sut).InternalChildren;
            internalChildren.Add(new VisualElement());
            internalChildren.Add(new VisualElement());
            internalChildren.Add(new VisualElement());

            var expected = new View();
            sut.Content = expected;

            Assert.AreEqual(1, internalChildren.Count);
            Assert.AreSame(expected, internalChildren[0]);
        }
    }
}