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

using System;
using NUnit.Framework;
using NUnit.Framework.Constraints;

namespace Xamarin.Forms.Core.UnitTests
{
	[TestFixture]
	public class AbsoluteLayoutTests : BaseTestFixture
	{

		[Test]
		public void Constructor ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			Assert.That (abs.Children, Is.Empty);

			var sizeReq = abs.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity);
			Assert.AreEqual (Size.Zero, sizeReq.Request);
			Assert.AreEqual (Size.Zero, sizeReq.Minimum);
		}

		[Test]
		public void AbsolutePositionAndSize ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View {IsPlatformEnabled = true};

			abs.Children.Add (child, new Rectangle (10, 20, 30, 40));

			abs.Layout (new Rectangle (0, 0, 100, 100));

			Assert.AreEqual (new Rectangle (10, 20, 30, 40), child.Bounds);
		}

		[Test]
		public void AbsolutePositionRelativeSize ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View {IsPlatformEnabled = true};


			abs.Children.Add (child, new Rectangle (10, 20, 0.4, 0.5), AbsoluteLayoutFlags.SizeProportional);

			abs.Layout (new Rectangle (0, 0, 100, 100));

			Assert.That (child.X, Is.EqualTo (10));
			Assert.That (child.Y, Is.EqualTo (20));
			Assert.That (child.Width, Is.EqualTo (40).Within (0.0001));
			Assert.That (child.Height, Is.EqualTo (50).Within (0.0001));
		}

		[TestCase (30, 40, 0.2, 0.3)]
		[TestCase (35, 45, 0.5, 0.5)]
		[TestCase (35, 45, 0, 0)]
		[TestCase (35, 45, 1, 1)]
		public void RelativePositionAbsoluteSize (double width, double height, double relX, double relY)
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View {IsPlatformEnabled = true};

			abs.Children.Add (child, new Rectangle (relX, relY, width, height), AbsoluteLayoutFlags.PositionProportional);

			abs.Layout (new Rectangle (0, 0, 100, 100));

			double expectedX = Math.Round ((100 - width) * relX);
			double expectedY = Math.Round ((100 - height) * relY);
			Assert.That (child.X, Is.EqualTo (expectedX).Within (0.0001));
			Assert.That (child.Y, Is.EqualTo (expectedY).Within (0.0001));
			Assert.That (child.Width, Is.EqualTo (width));
			Assert.That (child.Height, Is.EqualTo (height));
		}

		[Test]
		public void RelativePositionRelativeSize ([Values (0.0, 0.2, 0.5, 1.0)] double relX, [Values (0.0, 0.2, 0.5, 1.0)] double relY, [Values (0.0, 0.2, 0.5, 1.0)] double relHeight, [Values (0.0, 0.2, 0.5, 1.0)] double relWidth)
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View {
				IsPlatformEnabled = true
			};
			abs.Children.Add (child, new Rectangle(relX, relY, relWidth, relHeight), AbsoluteLayoutFlags.All);
			abs.Layout (new Rectangle(0, 0, 100, 100));

			double expectedWidth = Math.Round (100 * relWidth);
			double expectedHeight = Math.Round (100 * relHeight);
			double expectedX = Math.Round ((100 - expectedWidth) * relX);
			double expectedY = Math.Round ((100 - expectedHeight) * relY);
			Assert.That (child.X, Is.EqualTo (expectedX).Within (0.0001));
			Assert.That (child.Y, Is.EqualTo (expectedY).Within (0.0001));
			Assert.That (child.Width, Is.EqualTo (expectedWidth).Within (0.0001));
			Assert.That (child.Height, Is.EqualTo (expectedHeight).Within (0.0001));
		}

		[Test]
		public void SizeRequestWithNormalChild ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View ();

			// ChildSizeReq == 100x20
			abs.Children.Add (child, new Rectangle (10, 20, 30, 40));

			var sizeReq = abs.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity);

			Assert.AreEqual (new Size (40, 60), sizeReq.Request);
			Assert.AreEqual (new Size (40, 60), sizeReq.Minimum);
		}

		[Test]
		public void SizeRequestWithRelativePositionChild ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View ();

			// ChildSizeReq == 100x20
			abs.Children.Add (child, new Rectangle(0.5, 0.5, 30, 40), AbsoluteLayoutFlags.PositionProportional);

			var sizeReq = abs.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity);

			Assert.AreEqual (new Size (30, 40), sizeReq.Request);
			Assert.AreEqual (new Size (30, 40), sizeReq.Minimum);
		}

		[Test]
		public void SizeRequestWithRelativeChild ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			// ChildSizeReq == 100x20
			abs.Children.Add (child, new Rectangle(0.5, 0.5, 0.5, 0.5), AbsoluteLayoutFlags.All);

			var sizeReq = abs.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity);

			Assert.AreEqual (new Size (200, 40), sizeReq.Request);
			Assert.AreEqual (new Size (0, 0), sizeReq.Minimum);
		}

		[Test]
		public void SizeRequestWithRelativeSizeChild ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			// ChildSizeReq == 100x20
			abs.Children.Add (child, new Rectangle(10, 20, 0.5, 0.5), AbsoluteLayoutFlags.SizeProportional);

			var sizeReq = abs.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity);

			Assert.AreEqual (new Size (210, 60), sizeReq.Request);
			Assert.AreEqual (new Size (10, 20), sizeReq.Minimum);
		}

		[Test]
		public void MeasureInvalidatedFiresWhenFlagsChanged ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			abs.Children.Add (child, new Rectangle (1, 1, 100, 100));

			bool fired = false;
			abs.MeasureInvalidated += (sender, args) => fired = true;

			AbsoluteLayout.SetLayoutFlags (child, AbsoluteLayoutFlags.PositionProportional);

			Assert.True (fired);
		}

		[Test]
		public void MeasureInvalidatedFiresWhenBoundsChanged ()
		{
			var abs = new AbsoluteLayout {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			var child = new View {
				Platform = new UnitPlatform (),
				IsPlatformEnabled = true
			};

			abs.Children.Add (child, new Rectangle (1, 1, 100, 100));

			bool fired = false;
			abs.MeasureInvalidated += (sender, args) => fired = true;

			AbsoluteLayout.SetLayoutBounds (child, new Rectangle (2, 2, 200, 200));

			Assert.True (fired);
		}

		[Test]
		public void TestBoundsTypeConverter ()
		{
			var converter = new BoundsTypeConverter ();

			Assert.IsTrue (converter.CanConvertFrom (typeof(string)));
			Assert.AreEqual (new Rectangle (3, 4, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize), converter.ConvertFromInvariantString ("3, 4"));
			Assert.AreEqual (new Rectangle (3, 4, 20, 30), converter.ConvertFromInvariantString ("3, 4, 20, 30"));
			Assert.AreEqual (new Rectangle (3, 4, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize), converter.ConvertFromInvariantString ("3, 4, AutoSize, AutoSize"));
			Assert.AreEqual (new Rectangle (3, 4, AbsoluteLayout.AutoSize, 30), converter.ConvertFromInvariantString ("3, 4, AutoSize, 30"));
			Assert.AreEqual (new Rectangle (3, 4, 20, AbsoluteLayout.AutoSize), converter.ConvertFromInvariantString ("3, 4, 20, AutoSize"));
		}

		[Test]
		public void TurkeyTestBoundsTypeConverter ()
		{
			var converter = new BoundsTypeConverter ();

			var autoSize = "AutoSize";

			Assert.AreEqual (new Rectangle (3.3, 4.4, AbsoluteLayout.AutoSize, AbsoluteLayout.AutoSize), converter.ConvertFromInvariantString ("3.3, 4.4, " + autoSize + ", AutoSize"));
			Assert.AreEqual (new Rectangle (3.3, 4.4, 5.5, 6.6), converter.ConvertFromInvariantString ("3.3, 4.4, 5.5, 6.6"));
		}
	}
}