Dispatch WebView2 runtime toast notification on UI thread (#811)

Wino.Mail.WinUI/CoreUWPContainerSetup.cs

@@ -29,6 +29,7 @@ public static class CoreUWPContainerSetup
         services.AddTransient<IFileService, FileService>();
         services.AddTransient<IStoreRatingService, StoreRatingService>();
         services.AddTransient<IKeyPressService, KeyPressService>();
+        services.AddTransient<IWebView2RuntimeValidatorService, WebView2RuntimeValidatorService>();
         services.AddTransient<INotificationBuilder, NotificationBuilder>();
         services.AddSingleton<ICalendarReminderServer, CalendarReminderServer>();
         services.AddTransient<IClipboardService, ClipboardService>();

Wino.Mail.WinUI/Services/NotificationBuilder.cs

@@ -252,6 +252,18 @@ public class NotificationBuilder : INotificationBuilder
         builder.Show();
     }
 
+    public void CreateWebView2RuntimeMissingNotification()
+    {
+        var builder = new ToastContentBuilder();
+        builder.SetToastScenario(ToastScenario.Default);
+
+        builder.AddText(Translator.Exception_WebView2RuntimeMissing_Title);
+        builder.AddText(Translator.Exception_WebView2RuntimeMissing_Message);
+
+        builder.AddButton(GetDismissButton());
+        builder.Show();
+    }
+
     public Task CreateCalendarReminderNotificationAsync(CalendarItem calendarItem, long reminderDurationInSeconds)
     {
         if (calendarItem == null)

Wino.Mail.WinUI/Services/WebView2RuntimeValidatorService.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.Web.WebView2.Core;
+using Serilog;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Mail.WinUI.Services;
+
+public class WebView2RuntimeValidatorService : IWebView2RuntimeValidatorService
+{
+    public Task<bool> IsRuntimeAvailableAsync()
+    {
+        try
+        {
+            var version = CoreWebView2Environment.GetAvailableBrowserVersionString();
+            var hasRuntime = !string.IsNullOrWhiteSpace(version);
+
+            return Task.FromResult(hasRuntime);
+        }
+        catch (Exception ex)
+        {
+            Log.Error(ex, "WebView2 runtime validation failed.");
+            return Task.FromResult(false);
+        }
+    }
+}