SelectPhoneCodePopup.xaml.cs

using Mopups.Services;
using NeuroAccessMaui.Services.Data;
 
namespace NeuroAccessMaui.UI.Popups
{
    public partial class SelectPhoneCodePopup : IDisposable
    {
        private readonly TaskCompletionSource<ISO_3166_Country?> result = new();
        private CancellationTokenSource? cancellationTokenSource;
        private bool isDisposed;
 
        public Task<ISO_3166_Country?> Result => this.result.Task;
 
        public static ISO_3166_Country[] Countries => ISO_3166_1.Countries;
 
        public SelectPhoneCodePopup()
        {
            this.InitializeComponent();
            this.BindingContext = this;
 
            this.InnerSearchBar.Text = string.Empty;
        }
 
        private void SearchBar_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (e.NewTextValue.Length == 0)
            {
                this.InnerListView.ItemsSource = Countries;
                return;
            }
 
            if (this.cancellationTokenSource is not null)
            {
                this.cancellationTokenSource.Cancel();
                this.cancellationTokenSource = null;
            }
 
            this.cancellationTokenSource = new();
            CancellationToken Token = this.cancellationTokenSource.Token;
 
            Task.Run(() =>
            {
                IEnumerable<ISO_3166_Country> CountriesFiltered = Countries.Where(el =>
                {
                    bool Result = el.Name.Contains(e.NewTextValue, StringComparison.OrdinalIgnoreCase) ||
                    string.Equals(el.Alpha2, e.NewTextValue, StringComparison.OrdinalIgnoreCase) ||
                    string.Equals(el.Alpha3, e.NewTextValue, StringComparison.OrdinalIgnoreCase) ||
                    el.DialCode.Contains(e.NewTextValue, StringComparison.OrdinalIgnoreCase);
 
                    return Result;
                });
 
                this.Dispatcher.Dispatch(() =>
                {
                    if (!Token.IsCancellationRequested)
                        this.InnerListView.ItemsSource = CountriesFiltered;
                });
            }, Token);
        }
 
        private async void InnerListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            this.result.TrySetResult((ISO_3166_Country)this.InnerListView.SelectedItem);
            await MopupService.Instance.PopAsync();
        }
 
        protected override void OnDisappearing()
        {
            this.result.TrySetResult(null);
            base.OnDisappearing();
        }
 
        protected virtual void Dispose(bool disposing)
        {
            if (!this.isDisposed)
            {
                if (disposing)
                {
                    this.cancellationTokenSource?.Dispose();
                    this.cancellationTokenSource = null;
                }
 
                this.isDisposed = true;
            }
        }
 
        public void Dispose()
        {
            // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
            this.Dispose(disposing: true);
            GC.SuppressFinalize(this);
        }
    }
}