55 lines
1.5 KiB
C#
55 lines
1.5 KiB
C#
 
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namespace decePubClient.Services;
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public enum ToastSeverity
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{
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Info,
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Success,
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Warning,
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Error
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}
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public sealed record ToastMessage(Guid Id, ToastSeverity Severity, string Text);
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/// <summary>
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/// The app's snackbar: components add messages (usually through the SUtility extensions AddResponseError,
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/// AddResponseSuccess, AddWarning, AddException) and Components/ToastHost.razor, placed once in MainLayout, shows them.
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/// A message already on screen isn't added twice, and at most MaxMessages stay, oldest dropped first.
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/// </summary>
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public class ToastService
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{
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const int MaxMessages = 12;
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readonly List<ToastMessage> messages = [];
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public event Action Changed;
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public IReadOnlyList<ToastMessage> Messages => messages;
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/// <summary>Shows a message; with closeAfter it closes itself, otherwise it stays until the user closes it.</summary>
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public void Add(ToastSeverity severity, string text, TimeSpan? closeAfter = null)
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{
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if (string.IsNullOrWhiteSpace(text) || messages.Any(m => m.Severity == severity && m.Text == text))
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return;
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var message = new ToastMessage(Guid.NewGuid(), severity, text);
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messages.Add(message);
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if (messages.Count > MaxMessages)
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messages.RemoveAt(0);
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Changed?.Invoke();
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if (closeAfter is { } delay)
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_ = CloseLater(message.Id, delay);
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}
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public void Close(Guid id)
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{
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if (messages.RemoveAll(m => m.Id == id) > 0)
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Changed?.Invoke();
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}
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async Task CloseLater(Guid id, TimeSpan delay, CancellationToken cancellationToken = default)
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{
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await Task.Delay(delay, cancellationToken);
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Close(id);
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}
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}
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