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using System;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.None, 0, "Image Loading Error Handling", PlatformAffected.WinRT | PlatformAffected.UWP)]
public class ImageLoadingErrorHandling : TestContentPage
{
protected override void Init()
{
Log.Listeners.Add(
new DelegateLogListener((c, m) => Device.BeginInvokeOnMainThread(() => DisplayAlert(c, m, "Cool, Thanks"))));
var image = new Image() {BackgroundColor = Color.White};
Grid legit = CreateTest(() => image.Source = ImageSource.FromFile("coffee.png"),
"Valid Image",
"Clicking this button should load an image at the top of the page.",
Color.Silver);
Grid invalidImageFileName = CreateTest(() => image.Source = ImageSource.FromFile("fake.png"),
"Non-existent Image File",
"Clicking this button should display an alert dialog with an error that the image failed to load.");
Grid invalidImageFile = CreateTest(() => image.Source = ImageSource.FromFile("invalidimage.jpg"),
"Invalid Image File (bad data)",
"Clicking this button should display an alert dialog with an error that the image failed to load.",
Color.Silver);
Grid fakeUri = CreateTest(() => image.Source = ImageSource.FromUri(new Uri("http://not.real")),
"Non-existent URI",
(Device.RuntimePlatform == Device.UWP || Device.RuntimePlatform == Device.WinRT) && Device.Idiom == TargetIdiom.Phone
? "Clicking this button should display an alert dialog. The error message should include the text 'NotFound'."
: "Clicking this button should display an alert dialog. The error message should include the text 'the server name or address could not be resolved'.");
// This used to crash the app with an uncatchable error; need to make sure it's not still doing that
Grid crashImage = CreateTest(() => image.Source = new FailImageSource(),
"Source Throws Exception",
"Clicking this button should display an alert dialog. The error messages hould include the test 'error updating image source'.",
Color.Silver);
Grid uriInvalidImageData =
CreateTest(() => image.Source = ImageSource.FromUri(new Uri("https://gist.githubusercontent.com/hartez/a2dda6b5c78852bcf4832af18f21a023/raw/39f4cd2e9fe8514694ac7fa0943017eb9308853d/corrupt.jpg")),
"Valid URI with invalid image file",
"Clicking this button should display an alert dialog. The error message should include the text 'UriImageSourceHandler could not load https://gist.githubusercontent.com/hartez/a2dda6b5c78852bcf4832af18f21a023/raw/39f4cd2e9fe8514694ac7fa0943017eb9308853d/corrupt.jpg'");
Content = new StackLayout
{
Children =
{
image,
legit,
invalidImageFileName,
invalidImageFile,
fakeUri,
crashImage,
uriInvalidImageData
}
};
}
static Grid CreateTest(Action imageLoadAction, string title, string instructions, Color? backgroundColor = null)
{
var button = new Button { Text = "Test" };
button.Clicked += (sender, args) => imageLoadAction();
var titleLabel = new Label
{
Text = title,
FontAttributes = FontAttributes.Bold
};
var label = new Label
{
Text = instructions
};
var grid = new Grid
{
ColumnDefinitions =
new ColumnDefinitionCollection { new ColumnDefinition(), new ColumnDefinition(), new ColumnDefinition() },
RowDefinitions = new RowDefinitionCollection { new RowDefinition { Height = 80 } }
};
if (backgroundColor.HasValue)
{
grid.BackgroundColor = backgroundColor.Value;
}
grid.AddChild(titleLabel, 0, 0);
grid.AddChild(label, 1, 0);
grid.AddChild(button, 2, 0);
return grid;
}
}
}
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