using System; using System.Collections.Generic; using System.Linq; using NUnit.Framework; using System.IO; using System.Threading.Tasks; using System.Threading; namespace Xamarin.Forms.Core.UnitTests { [TestFixture] public class ImageTests : BaseTestFixture { [SetUp] public override void Setup () { base.Setup (); Device.PlatformServices = new MockPlatformServices (getStreamAsync: GetStreamAsync); } [TearDown] public override void TearDown() { base.TearDown (); Device.PlatformServices = null; } [Test] public void TestSizing () { var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true}; var result = image.GetSizeRequest (double.PositiveInfinity, double.PositiveInfinity); Assert.AreEqual (100, result.Request.Width); Assert.AreEqual (20, result.Request.Height); } [Test] public void TestAspectSizingWithConstrainedHeight () { var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true}; var result = image.GetSizeRequest (double.PositiveInfinity, 10); Assert.AreEqual (50, result.Request.Width); Assert.AreEqual (10, result.Request.Height); } [Test] public void TestAspectSizingWithConstrainedWidth () { var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true}; var result = image.GetSizeRequest (25, double.PositiveInfinity); Assert.AreEqual (25, result.Request.Width); Assert.AreEqual (5, result.Request.Height); } [Test] public void TestAspectFillSizingWithConstrainedHeight () { var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true}; image.Aspect = Aspect.AspectFill; var result = image.GetSizeRequest (double.PositiveInfinity, 10); Assert.AreEqual (50, result.Request.Width); Assert.AreEqual (10, result.Request.Height); } [Test] public void TestAspectFillSizingWithConstrainedWidth () { var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true}; image.Aspect = Aspect.AspectFill; var result = image.GetSizeRequest (25, double.PositiveInfinity); Assert.AreEqual (25, result.Request.Width); Assert.AreEqual (5, result.Request.Height); } [Test] public void TestFillSizingWithConstrainedHeight () { var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true}; image.Aspect = Aspect.AspectFill; var result = image.GetSizeRequest (double.PositiveInfinity, 10); Assert.AreEqual (50, result.Request.Width); Assert.AreEqual (10, result.Request.Height); } [Test] public void TestFillSizingWithConstrainedWidth () { var image = new Image {Source = ImageSource.FromFile ("File.png"), Platform = new UnitPlatform (), IsPlatformEnabled = true}; image.Aspect = Aspect.AspectFill; var result = image.GetSizeRequest (25, double.PositiveInfinity); Assert.AreEqual (25, result.Request.Width); Assert.AreEqual (5, result.Request.Height); } [Test] public void TestSizeChanged () { var image = new Image { Source = "File0.png" }; Assert.AreEqual ("File0.png", ((FileImageSource)image.Source).File); var preferredSizeChanged = false; image.MeasureInvalidated += (sender, args) => preferredSizeChanged = true; image.Source = "File1.png"; Assert.AreEqual ("File1.png", ((FileImageSource)image.Source).File); Assert.True (preferredSizeChanged); } [Test] public void TestSource () { var image = new Image (); Assert.IsNull (image.Source); bool signaled = false; image.PropertyChanged += (sender, e) => { if (e.PropertyName == "Source") signaled = true; }; var source = ImageSource.FromFile ("File.png"); image.Source = source; Assert.AreEqual (source, image.Source); Assert.True (signaled); } [Test] public void TestSourceDoubleSet () { var image = new Image {Source = ImageSource.FromFile ("File.png")}; bool signaled = false; image.PropertyChanged += (sender, e) => { if (e.PropertyName == "Source") signaled = true; }; image.Source = image.Source; Assert.False (signaled); } [Test] public void TestFileImageSourceChanged () { var source = (FileImageSource)ImageSource.FromFile ("File.png"); bool signaled = false; source.SourceChanged += (sender, e) => { signaled = true; }; source.File = "Other.png"; Assert.AreEqual ("Other.png", source.File); Assert.True (signaled); } [Test] public void TestFileImageSourcePropertiesChangedTriggerResize () { var source = new FileImageSource (); var image = new Image { Source = source }; bool fired = false; image.MeasureInvalidated += (sender, e) => fired = true; Assert.Null (source.File); source.File = "foo.png"; Assert.NotNull (source.File); Assert.True (fired); } [Test] public void TestStreamImageSourcePropertiesChangedTriggerResize () { var source = new StreamImageSource (); var image = new Image { Source = source }; bool fired = false; image.MeasureInvalidated += (sender, e) => fired = true; Assert.Null (source.Stream); source.Stream = token => Task.FromResult (null); Assert.NotNull (source.Stream); Assert.True (fired); } [Test] public void TestImageSourceToNullCancelsLoading () { var image = new Image (); var mockImageRenderer = new MockImageRenderer (image); var loader = new UriImageSource { Uri = new Uri ("http://www.public-domain-image.com/free-images/miscellaneous/big-high-border-fence.jpg") }; image.Source = loader; Assert.IsTrue (image.IsLoading); image.Source = null; Assert.IsFalse (image.IsLoading); Assert.IsTrue (cancelled); } static bool cancelled; static async Task GetStreamAsync (Uri uri, CancellationToken cancellationToken) { try { await Task.Delay (5000, cancellationToken); } catch (TaskCanceledException ex) { cancelled = true; throw ex; } if (cancellationToken.IsCancellationRequested) { cancelled = true; throw new TaskCanceledException (); } var stream = typeof(ImageTests).Assembly.GetManifestResourceStream (uri.LocalPath.Substring (1)); return stream; } class MockImageRenderer { public MockImageRenderer (Image element) { Element = element; Element.PropertyChanged += ( sender, e) => { if (e.PropertyName == nameof (Image.Source)) Load (); }; } public Image Element { get; set; } public async void Load () { if (initialLoad && Element.Source != null) { initialLoad = false; Element.SetIsLoading(true); await (Element.Source as UriImageSource).GetStreamAsync (); Element.SetIsLoading(false); } } bool initialLoad = true; } } }