Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

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

@@ -0,0 +1,43 @@
+using System;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.Messaging;
+using Microsoft.Extensions.DependencyInjection;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.UWP;
+using Wino.Messaging.UI;
+
+namespace Wino.Dialogs
+{
+    public sealed partial class AccountCreationDialog : BaseAccountCreationDialog, IRecipient<CopyAuthURLRequested>
+    {
+        private string copyClipboardURL;
+        public AccountCreationDialog()
+        {
+            InitializeComponent();
+
+            WeakReferenceMessenger.Default.Register(this);
+        }
+
+        public async void Receive(CopyAuthURLRequested message)
+        {
+            copyClipboardURL = message.AuthURL;
+
+            await Task.Delay(2000);
+
+            await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
+            {
+                AuthHelpDialogButton.Visibility = Windows.UI.Xaml.Visibility.Visible;
+            });
+        }
+
+        private void CancelClicked(object sender, Windows.UI.Xaml.RoutedEventArgs e) => Complete(true);
+
+        private async void CopyClicked(object sender, Windows.UI.Xaml.RoutedEventArgs e)
+        {
+            if (string.IsNullOrEmpty(copyClipboardURL)) return;
+
+            var clipboardService = WinoApplication.Current.Services.GetService<IClipboardService>();
+            await clipboardService.CopyClipboardAsync(copyClipboardURL);
+        }
+    }
+}