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

using System;

using NUnit.Framework;
using Xamarin.Forms.Internals;

namespace Xamarin.Forms.Core.UnitTests
{
	internal class TestDeviceInfo : DeviceInfo
	{
		public TestDeviceInfo ()
		{
			CurrentOrientation = DeviceOrientation.Portrait;
		}
		public override Size PixelScreenSize
		{
			get { return new Size (100, 200); }
		}

		public override Size ScaledScreenSize
		{
			get { return new Size (50, 100); }
		}

		public override double ScalingFactor
		{
			get { return 2; }
		}
	}

	[TestFixture]
	public class MasterDetailPageUnitTests : BaseTestFixture
	{
		[SetUp]
		public override void Setup()
		{
			base.Setup ();
			var mockDeviceInfo = new TestDeviceInfo ();
			Device.Info = mockDeviceInfo;
		}

		[Test]
		public void TestConstructor ()
		{

			MasterDetailPage page = new MasterDetailPage ();

			Assert.Null (page.Master);
			Assert.Null (page.Detail);
		}

		[Test]
		public void TestMasterSetter ()
		{
			MasterDetailPage page = new MasterDetailPage ();
			var child = new ContentPage {Content = new Label (), Title = "Foo"};
			page.Master = child;

			Assert.AreEqual (child, page.Master);
		}

		[Test]
		public void TestMasterSetNull ()
		{
			MasterDetailPage page = new MasterDetailPage ();
			var child = new ContentPage {Content = new Label (), Title = "Foo"};
			page.Master = child;

			Assert.Throws<ArgumentNullException> (() => { page.Master = null; });
		}

		[Test]
		public void TestMasterChanged ()
		{
			MasterDetailPage page = new MasterDetailPage ();
			var child = new ContentPage {Content = new Label (), Title = "Foo"};

			bool changed = false;
			page.PropertyChanged += (sender, e) => {
				if (e.PropertyName == "Master")
					changed = true;
			};

			page.Master = child;
			
			Assert.True (changed);
		}

		[Test]
		public void TestDetailSetter ()
		{
			MasterDetailPage page = new MasterDetailPage ();
			var child = new ContentPage {Content = new Label ()};
			page.Detail = child;
			
			Assert.AreEqual (child, page.Detail);
		}
		
		[Test]
		public void TestDetailSetNull ()
		{
			MasterDetailPage page = new MasterDetailPage ();
			var child = new ContentPage {Content = new Label ()};
			page.Detail = child;
			
			Assert.Throws<ArgumentNullException> ( () => { page.Detail = null; });
		}
		
		[Test]
		public void TestDetailChanged ()
		{
			MasterDetailPage page = new MasterDetailPage ();
			var child = new ContentPage {Content = new Label ()};
			
			bool changed = false;
			page.PropertyChanged += (sender, e) => {
				if (e.PropertyName == "Detail")
					changed = true;
			};
			
			page.Detail = child;
			
			Assert.True (changed);
		}

		[Test]
		public void ThrowsWhenMasterSetWithoutValidTitle ([Values (null, "")] string title)
		{
			var page = new MasterDetailPage ();
			Assert.Throws<InvalidOperationException> (() => page.Master = new ContentPage {Title = title});
		}

		[Test]
		public void TestThrowsWhenPackedWithoutSetting ()
		{
			MasterDetailPage page = new MasterDetailPage ();
			Assert.Throws<InvalidOperationException> (() => new TabbedPage {Children = {page}});
		}

		[Test]
		public void TestDoesNotThrowWhenPackedWithSetting ()
		{
			MasterDetailPage page = new MasterDetailPage {
				Master = new ContentPage {Content = new View (), Title = "Foo"},
				Detail = new ContentPage {Content = new View ()}
			};
			Assert.DoesNotThrow (() => new TabbedPage {Children = {page}});
		}

		[Test]
		public void TestMasterVisible ()
		{
			var page = new MasterDetailPage ();

			Assert.AreEqual (false, page.IsPresented);

			bool signaled = false;
			page.PropertyChanged += (sender, args) => {
				if (args.PropertyName == MasterDetailPage.IsPresentedProperty.PropertyName)
					signaled = true;
			};

			page.IsPresented = true;

			Assert.AreEqual (true, page.IsPresented);
			Assert.True (signaled);
		}

		[Test]
		public void TestMasterVisibleDoubleSet ()
		{
			var page = new MasterDetailPage ();

			bool signaled = false;
			page.PropertyChanged += (sender, args) => {
				if (args.PropertyName == MasterDetailPage.IsPresentedProperty.PropertyName)
					signaled = true;
			};

			page.IsPresented = page.IsPresented;

			Assert.False (signaled);
		}

		[Test]
		public void TestSetMasterBounds ()
		{
			var page = new MasterDetailPage {
				Master = new ContentPage {Content = new View (), Title = "Foo"},
				Detail = new ContentPage {Content = new View ()}
			};

			((IMasterDetailPageController)page).MasterBounds = new Rectangle (0, 0, 100, 100);
			Assert.AreEqual (new Rectangle (0, 0, 100, 100), page.Master.Bounds);
			Assert.AreEqual (new Rectangle (0, 0, 100, 100), ((IMasterDetailPageController)page).MasterBounds);
		}

		[Test]
		public void TestSetDetailBounds ()
		{
			var page = new MasterDetailPage {
				Master = new ContentPage {Content = new View (), Title = "Foo"},
				Detail = new ContentPage {Content = new View ()}
			};

			((IMasterDetailPageController)page).DetailBounds = new Rectangle (0, 0, 100, 100);
			Assert.AreEqual (new Rectangle (0, 0, 100, 100), page.Detail.Bounds);
			Assert.AreEqual (new Rectangle (0, 0, 100, 100), ((IMasterDetailPageController)page).DetailBounds);
		}

		[Test]
		public void TestLayoutChildren ()
		{
			var page = new MasterDetailPage {
				Master = new ContentPage { Content = new View (), IsPlatformEnabled = true, Title = "Foo" },
				Detail = new ContentPage { Content = new View (), IsPlatformEnabled = true },
				IsPlatformEnabled = true,
				Platform = new UnitPlatform ()
			};

			((IMasterDetailPageController)page).MasterBounds = new Rectangle (0, 0, 100, 200);
			((IMasterDetailPageController)page).DetailBounds = new Rectangle (0, 0, 100, 100);

			page.Master.Layout (new Rectangle(0, 0, 1, 1));
			page.Detail.Layout (new Rectangle(0, 0, 1, 1));

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

			Assert.AreEqual (new Rectangle (0, 0, 100, 200), page.Master.Bounds);
			Assert.AreEqual (new Rectangle (0, 0, 100, 100), page.Detail.Bounds);
		}

		[Test]
		public void ThorwsInLayoutChildrenWithNullDetail ()
		{
			var page = new MasterDetailPage {
				Master = new ContentPage { Content = new View (), IsPlatformEnabled = true, Title = "Foo" },
				IsPlatformEnabled = true,
				Platform = new UnitPlatform ()
			};

			Assert.Throws<InvalidOperationException> (() => page.Layout (new Rectangle (0, 0, 200, 200)));
		}

		[Test]
		public void ThorwsInLayoutChildrenWithNullMaster ()
		{
			var page = new MasterDetailPage {
				Detail = new ContentPage { Content = new View (), IsPlatformEnabled = true },
				IsPlatformEnabled = true,
				Platform = new UnitPlatform ()
			};

			Assert.Throws<InvalidOperationException> (() => page.Layout (new Rectangle(0, 0, 200, 200)));
		}

		[Test]
		public void ThorwsInSetDetailBoundsWithNullDetail ()
		{
			var page = new MasterDetailPage {
				Master = new ContentPage {Content = new View (), Title = "Foo"},
				IsPlatformEnabled = true,
				Platform = new UnitPlatform ()
			};

			Assert.Throws<InvalidOperationException> (() => ((IMasterDetailPageController)page).DetailBounds = new Rectangle(0, 0, 200, 200));
		}

		[Test]
		public void ThrowsInSetMasterBoundsWithNullMaster ()
		{
			var page = new MasterDetailPage {
				Detail = new ContentPage {Content = new View ()},
				IsPlatformEnabled = true,
				Platform = new UnitPlatform ()
			};

			Assert.Throws<InvalidOperationException> (() => ((IMasterDetailPageController)page).MasterBounds = new Rectangle(0, 0, 200, 200));
		}

		[Test]
		public void ThrowsInSetIsPresentOnSplitModeOnTablet ()
		{
			Device.Idiom = TargetIdiom.Tablet;
			var page = new MasterDetailPage {
				Master = new ContentPage { Content = new View (), IsPlatformEnabled = true, Title = "Foo" },
				Detail = new ContentPage { Content = new View (), IsPlatformEnabled = true },
				IsPlatformEnabled = true,
				Platform = new UnitPlatform (),
				MasterBehavior = MasterBehavior.Split
			};

			Assert.Throws<InvalidOperationException> (() => page.IsPresented = false);
		}

		[Test]
		public void ThorwsInSetIsPresentOnSplitPortraitModeOnTablet ()
		{
			Device.Idiom = TargetIdiom.Tablet;
			Device.Info.CurrentOrientation = DeviceOrientation.Portrait;

			var page = new MasterDetailPage {
				Master = new ContentPage { Content = new View (), IsPlatformEnabled = true, Title = "Foo" },
				Detail = new ContentPage { Content = new View (), IsPlatformEnabled = true },
				IsPlatformEnabled = true,
				Platform = new UnitPlatform (),
				MasterBehavior = MasterBehavior.SplitOnPortrait
			};

			Assert.Throws<InvalidOperationException> (() => page.IsPresented = false);
		}

		[Test]
		public void TestSetIsPresentedOnPopoverMode ()
		{
			Device.Info.CurrentOrientation = DeviceOrientation.Landscape;

			var page = new MasterDetailPage {
				Master = new ContentPage { Content = new View (), IsPlatformEnabled = true, Title = "Foo" },
				Detail = new ContentPage { Content = new View (), IsPlatformEnabled = true },
				IsPlatformEnabled = true,
				Platform = new UnitPlatform (),
				MasterBehavior = MasterBehavior.Popover
			};
			page.IsPresented = true;

			Assert.AreEqual (true, page.IsPresented);
		}

		[Test]
		public void SendsBackEventToPresentedMasterFirst ()
		{
			var detail = new BackButtonPage () {Handle = true};
			var master = new BackButtonPage () {Title = "Master"};
			var mdp = new MasterDetailPage () {
				Detail = detail,
				Master = master,
				IsPresented = true,
				IsPlatformEnabled = true,
				Platform = new UnitPlatform ()
			};

			((IMasterDetailPageController)mdp).BackButtonPressed += (sender, args) => {
				args.Handled = mdp.IsPresented;
				mdp.IsPresented = false;
			};

			var detailEmitted = false;
			var masterEmitted = false;

			detail.BackPressed += (sender, args) => detailEmitted = true;
			master.BackPressed += (sender, args) => masterEmitted = true;

			var result = mdp.SendBackButtonPressed ();

			Assert.True (masterEmitted);
			Assert.False (detailEmitted);
			Assert.True (result);
		}

		[Test]
		public void EmitsCorrectlyWhenPresentedOnBackPressed ()
		{
			var detail = new BackButtonPage ();
			var master = new BackButtonPage { Title = "Master" };
			var mdp = new MasterDetailPage {
				Detail = detail,
				Master = master,
				IsPresented = true,
				IsPlatformEnabled = true,
				Platform = new UnitPlatform ()
			};

			((IMasterDetailPageController)mdp).BackButtonPressed += (sender, args) => {
				args.Handled = mdp.IsPresented;
				mdp.IsPresented = false;
			};

			var detailEmitted = false;
			var masterEmitted = false;

			detail.BackPressed += (sender, args) => detailEmitted = true;
			master.BackPressed += (sender, args) => masterEmitted = true;

			var result = mdp.SendBackButtonPressed ();

			Assert.True (masterEmitted);
			Assert.False (detailEmitted);
			Assert.True (result);
		}

		[Test]
		public void ThrowsExceptionWhenAddingAlreadyParentedDetail ()
		{
			var detail = new ContentPage {};

			// give detail a parent
			var nav = new NavigationPage (detail);

			var mdp = new MasterDetailPage ();
			Assert.Throws<InvalidOperationException> (() => mdp.Detail = detail);
		}

		[Test]
		public void ThrowsExceptionWhenAddingAlreadyParentedMaster ()
		{
			var master = new ContentPage { Title = "Foo" };

			// give master a parent
			var nav = new NavigationPage (master);

			var mdp = new MasterDetailPage ();
			Assert.Throws<InvalidOperationException> (() => mdp.Master = master);
		}
	}
	
}