annotations/Azaion.Annotator/Extensions/FuncExtensions.cs

namespace Azaion.Annotator.Extensions;

public static class FuncExtensions
{
    private static CancellationTokenSource? _lastCToken;

    public static Action Debounce(this Action func, TimeSpan? throttleTime = null) =>
        () =>
        {
            _lastCToken?.Cancel();

            var tokenSrc = _lastCToken = new CancellationTokenSource();
            Task.Delay(throttleTime ?? TimeSpan.FromMilliseconds(500), tokenSrc.Token)
                .ContinueWith(_ => func(), tokenSrc.Token);
        };
}