Wino-Mail/Wino.Core.UWP/Dialogs/AccountCreationDialog.xaml.cs

using System.Threading;
using System.Threading.Tasks;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Wino.Core.Domain.Enums;
using Wino.Core.Domain.Interfaces;

namespace Wino.Dialogs;

public sealed partial class AccountCreationDialog : ContentDialog, IAccountCreationDialog
{
    private TaskCompletionSource<bool> dialogOpened = new TaskCompletionSource<bool>();
    public CancellationTokenSource CancellationTokenSource { get; private set; }

    public AccountCreationDialogState State
    {
        get { return (AccountCreationDialogState)GetValue(StateProperty); }
        set { SetValue(StateProperty, value); }
    }

    public static readonly DependencyProperty StateProperty = DependencyProperty.Register(nameof(State), typeof(AccountCreationDialogState), typeof(AccountCreationDialog), new PropertyMetadata(AccountCreationDialogState.Idle));

    public AccountCreationDialog()
    {
        InitializeComponent();
    }

    // Prevent users from dismissing it by ESC key.
    public void DialogClosing(ContentDialog sender, ContentDialogClosingEventArgs args)
    {
        if (args.Result == ContentDialogResult.None)
        {
            args.Cancel = true;
        }
    }

    public void Complete(bool cancel)
    {
        State = cancel ? AccountCreationDialogState.Canceled : AccountCreationDialogState.Completed;

        // Unregister from closing event.
        Closing -= DialogClosing;

        if (cancel && !CancellationTokenSource.IsCancellationRequested)
        {
            CancellationTokenSource.Cancel();
        }

        Hide();
    }

    private void CancelClicked(object sender, System.EventArgs e) => Complete(true);

    public async Task ShowDialogAsync(CancellationTokenSource cancellationTokenSource)
    {
        CancellationTokenSource = cancellationTokenSource;

        Opened += DialogOpened;
        _ = ShowAsync();

        await dialogOpened.Task;
    }

    private void DialogOpened(ContentDialog sender, ContentDialogOpenedEventArgs args)
    {
        Opened -= DialogOpened;

        dialogOpened?.SetResult(true);
    }
}