using System.Threading;
using System.Threading.Tasks;

namespace SWS.CAD.Models.NoEntity
{
    /// <summary>
    /// 搜索框防抖类
    /// </summary>
    public class Debouncer
    {
        private readonly int _delayMilliseconds;
        private CancellationTokenSource _cancellationTokenSource;

        public Debouncer(int delayMilliseconds = 300)
        {
            _delayMilliseconds = delayMilliseconds;
        }

        public void Debounce(System.Action action)
        {
            _cancellationTokenSource?.Cancel();
            _cancellationTokenSource = new CancellationTokenSource();

            Task.Delay(_delayMilliseconds, _cancellationTokenSource.Token)
                .ContinueWith(t =>
                {
                    if (t.IsCompleted && !t.IsCanceled)
                    {
                        action?.Invoke();
                    }
                }, TaskScheduler.FromCurrentSynchronizationContext());
        }
    }
}