40 lines
1.4 KiB
C#
40 lines
1.4 KiB
C#
 
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namespace decePubClient.Services
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{
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/// <summary>
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/// Asks before what can't be undone (deleting a post, blocking, leaving a group, signing out): Ask shows the question
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/// in ConfirmHost (MainLayout) and returns whether the reader confirmed it. One question at a time; a second one asked
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/// while the first is open answers the first no.
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/// </summary>
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public class ConfirmService
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{
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TaskCompletionSource<bool> pending;
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public event Action Changed;
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public bool IsAsking => pending is not null;
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public string Heading { get; private set; }
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public string Text { get; private set; }
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public string ConfirmText { get; private set; }
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/// <summary>The confirm button shows as a danger (it deletes or cuts something off).</summary>
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public bool Danger { get; private set; }
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public async Task<bool> Ask(string heading, string text, string confirmText, bool danger, CancellationToken cancellationToken = default)
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{
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pending?.TrySetResult(false);
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var asking = new TaskCompletionSource<bool>();
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pending = asking;
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(Heading, Text, ConfirmText, Danger) = (heading, text, confirmText, danger);
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Changed?.Invoke();
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await using var cancel = cancellationToken.Register(() => asking.TrySetResult(false));
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var confirmed = await asking.Task;
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if (pending == asking)
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{
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pending = null;
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Changed?.Invoke();
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}
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return confirmed;
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}
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public void Answer(bool confirmed) => pending?.TrySetResult(confirmed);
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}
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}
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