Printing mails. (#471)

* Implemented printing functionality.

* Implemented icon for printing.

* Remove debug code.

Wino.Core.Domain/Enums/PrintingResult.cs

@@ -0,0 +1,10 @@
+namespace Wino.Core.Domain.Enums
+{
+    public enum PrintingResult
+    {
+        Abandoned,
+        Canceled,
+        Failed,
+        Submitted
+    }
+}

Wino.Core.Domain/Interfaces/IApplicationConfiguration.cs

@@ -17,5 +17,11 @@
         /// Publisher shared folder path.
         /// </summary>
         string PublisherSharedFolderPath { get; set; }
+
+        /// <summary>
+        /// Temp folder path of the application.
+        /// Files here are short-lived and can be deleted by system.
+        /// </summary>
+        string ApplicationTempFolderPath { get; set; }
     }
 }

Wino.Core.Domain/Interfaces/IPrintService.cs

@@ -0,0 +1,10 @@
+using System.Threading.Tasks;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Interfaces
+{
+    public interface IPrintService
+    {
+        Task<PrintingResult> PrintPdfFileAsync(string pdfFilePath, string printTitle);
+    }
+}

Wino.Core.Domain/Models/Printing/PrintInformation.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace Wino.Core.Domain.Models.Printing
+{
+    public class PrintInformation
+    {
+        public PrintInformation(string pDFFilePath, string pDFTitle)
+        {
+            PDFFilePath = pDFFilePath ?? throw new ArgumentNullException(nameof(pDFFilePath));
+            PDFTitle = pDFTitle ?? throw new ArgumentNullException(nameof(pDFTitle));
+        }
+
+        public string PDFFilePath { get; }
+        public string PDFTitle { get; }
+    }
+}

Wino.Core.Domain/Translations/en_US/resources.json

@@ -100,6 +100,10 @@
     "DialogMessage_ComposerValidationFailedTitle": "Validation Failed",
     "DialogMessage_CreateLinkedAccountMessage": "Give this new link a name. Accounts will be merged under this name.",
     "DialogMessage_CreateLinkedAccountTitle": "Account Link Name",
+    "DialogMessage_PrintingFailedMessage": "Failed to print this mail. Result: {0}",
+    "DialogMessage_PrintingFailedTitle": "Failed",
+    "DialogMessage_PrintingSuccessTitle": "Success",
+    "DialogMessage_PrintingSuccessMessage": "Mail is sent to printer.",
     "DialogMessage_DeleteAccountConfirmationMessage": "Delete {0}?",
     "DialogMessage_DeleteAccountConfirmationTitle": "All data associated with this account will be deleted from disk permanently.",
     "DialogMessage_DiscardDraftConfirmationMessage": "This draft will be discarded. Do you want to continue?",

Wino.Core.UWP/CoreUWPContainerSetup.cs

@@ -28,6 +28,7 @@ namespace Wino.Core.UWP
             services.AddTransient<INotificationBuilder, NotificationBuilder>();
             services.AddTransient<IClipboardService, ClipboardService>();
             services.AddTransient<IStartupBehaviorService, StartupBehaviorService>();
+            services.AddSingleton<IPrintService, PrintService>();
         }
     }
 }

Wino.Core.UWP/Services/PrintService.cs

@@ -0,0 +1,266 @@
+using System;
+using System.Collections.Generic;
+using System.Numerics;
+using System.Threading.Tasks;
+using Microsoft.Graphics.Canvas;
+using Microsoft.Graphics.Canvas.Printing;
+using Windows.Data.Pdf;
+using Windows.Graphics.Printing;
+using Windows.Graphics.Printing.OptionDetails;
+using Windows.Storage.Streams;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Printing;
+
+namespace Wino.Core.UWP.Services
+{
+    /// <summary>
+    /// Printer service that uses WinRT APIs to print PDF files.
+    /// Used modified version of the code here:
+    /// https://github.com/microsoft/Win2D-Samples/blob/reunion_master/ExampleGallery/PrintingExample.xaml.cs
+    /// HTML file is saved as PDF to temporary location.
+    /// Then PDF is loaded as PdfDocument and printed using CanvasBitmap for each page.
+    /// </summary>
+    public class PrintService : IPrintService
+    {
+        private TaskCompletionSource<PrintingResult> _taskCompletionSource;
+        private CanvasPrintDocument printDocument;
+        private PrintTask printTask;
+        private PdfDocument pdfDocument;
+
+        private List<CanvasBitmap> bitmaps = new();
+        private Vector2 largestBitmap;
+        private Vector2 pageSize;
+        private Vector2 imagePadding = new Vector2(64, 64);
+        private Vector2 cellSize;
+
+        private int bitmapCount;
+        private int columns;
+        private int rows;
+        private int bitmapsPerPage;
+        private int pageCount = -1;
+
+        private PrintInformation _currentPrintInformation;
+
+        public async Task<PrintingResult> PrintPdfFileAsync(string pdfFilePath, string printTitle)
+        {
+            if (_taskCompletionSource != null)
+            {
+                _taskCompletionSource.TrySetResult(PrintingResult.Abandoned);
+                _taskCompletionSource = new TaskCompletionSource<PrintingResult>();
+            }
+
+            // Load the PDF file
+            var file = await Windows.Storage.StorageFile.GetFileFromPathAsync(pdfFilePath);
+            pdfDocument = await PdfDocument.LoadFromFileAsync(file);
+
+            _taskCompletionSource ??= new TaskCompletionSource<PrintingResult>();
+
+            _currentPrintInformation = new PrintInformation(pdfFilePath, printTitle);
+
+            printDocument = new CanvasPrintDocument();
+            printDocument.PrintTaskOptionsChanged += OnDocumentTaskOptionsChanged;
+            printDocument.Preview += OnDocumentPreview;
+            printDocument.Print += OnDocumentPrint;
+
+            var printManager = PrintManager.GetForCurrentView();
+            printManager.PrintTaskRequested += PrintingExample_PrintTaskRequested;
+
+            try
+            {
+                await PrintManager.ShowPrintUIAsync();
+
+                var result = await _taskCompletionSource.Task;
+
+                return result;
+            }
+            finally
+            {
+                // Dispose everything.
+                UnregisterPrintManager(printManager);
+                ClearBitmaps();
+                UnregisterTask();
+                DisposePDFDocument();
+
+                _taskCompletionSource = null;
+            }
+        }
+
+        private void DisposePDFDocument()
+        {
+            if (pdfDocument != null)
+            {
+                pdfDocument = null;
+            }
+        }
+
+        private void UnregisterTask()
+        {
+            if (printTask != null)
+            {
+                printTask.Completed -= TaskCompleted;
+                printTask = null;
+            }
+        }
+
+        private void UnregisterPrintManager(PrintManager manager)
+        {
+            manager.PrintTaskRequested -= PrintingExample_PrintTaskRequested;
+        }
+
+        private void ClearBitmaps()
+        {
+            foreach (var bitmap in bitmaps)
+            {
+                bitmap.Dispose();
+            }
+
+            bitmaps.Clear();
+        }
+
+        private void PrintingExample_PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs args)
+        {
+            if (_currentPrintInformation == null) return;
+
+            printTask = args.Request.CreatePrintTask(_currentPrintInformation.PDFTitle, (createPrintTaskArgs) =>
+            {
+                createPrintTaskArgs.SetSource(printDocument);
+            });
+
+            printTask.Completed += TaskCompleted;
+        }
+
+        private void TaskCompleted(PrintTask sender, PrintTaskCompletedEventArgs args)
+            => _taskCompletionSource?.TrySetResult((PrintingResult)args.Completion);
+
+        private async void OnDocumentTaskOptionsChanged(CanvasPrintDocument sender, CanvasPrintTaskOptionsChangedEventArgs args)
+        {
+            var deferral = args.GetDeferral();
+
+            try
+            {
+                await LoadPDFPageBitmapsAsync(sender);
+
+                var pageDesc = args.PrintTaskOptions.GetPageDescription(1);
+                var newPageSize = pageDesc.PageSize.ToVector2();
+
+                if (pageSize == newPageSize && pageCount != -1)
+                {
+                    // We've already figured out the pages and the page size hasn't changed, so there's nothing left for us to do here.
+                    return;
+                }
+
+                pageSize = newPageSize;
+                sender.InvalidatePreview();
+
+                // Figure out the bitmap index at the top of the current preview page.  We'll request that the preview defaults to showing
+                // the page that still has this bitmap on it in the new layout.
+                int indexOnCurrentPage = 0;
+                if (pageCount != -1)
+                {
+                    indexOnCurrentPage = (int)(args.CurrentPreviewPageNumber - 1) * bitmapsPerPage;
+                }
+
+                // Calculate the new layout
+                var printablePageSize = pageSize * 0.9f;
+
+                cellSize = largestBitmap + imagePadding;
+
+                var cellsPerPage = printablePageSize / cellSize;
+
+                columns = Math.Max(1, (int)Math.Floor(cellsPerPage.X));
+                rows = Math.Max(1, (int)Math.Floor(cellsPerPage.Y));
+
+                bitmapsPerPage = columns * rows;
+
+                // Calculate the page count
+                bitmapCount = bitmaps.Count;
+                pageCount = (int)Math.Ceiling(bitmapCount / (double)bitmapsPerPage);
+                sender.SetPageCount((uint)pageCount);
+
+                // Set the preview page to the one that has the item that was currently displayed in the last preview
+                args.NewPreviewPageNumber = (uint)(indexOnCurrentPage / bitmapsPerPage) + 1;
+            }
+            finally
+            {
+                deferral.Complete();
+            }
+        }
+
+
+        private async Task LoadPDFPageBitmapsAsync(CanvasPrintDocument sender)
+        {
+            ClearBitmaps();
+
+            bitmaps ??= new List<CanvasBitmap>();
+
+            for (int i = 0; i < pdfDocument.PageCount; i++)
+            {
+                var page = pdfDocument.GetPage((uint)i);
+                var stream = new InMemoryRandomAccessStream();
+                await page.RenderToStreamAsync(stream);
+                var bitmap = await CanvasBitmap.LoadAsync(sender, stream);
+                bitmaps.Add(bitmap);
+            }
+
+            largestBitmap = Vector2.Zero;
+
+            foreach (var bitmap in bitmaps)
+            {
+                largestBitmap.X = Math.Max(largestBitmap.X, (float)bitmap.Size.Width);
+                largestBitmap.Y = Math.Max(largestBitmap.Y, (float)bitmap.Size.Height);
+            }
+        }
+
+
+        private void OnDocumentPreview(CanvasPrintDocument sender, CanvasPreviewEventArgs args)
+        {
+            var ds = args.DrawingSession;
+            var pageNumber = args.PageNumber;
+
+            DrawPdfPage(sender, ds, pageNumber);
+        }
+
+        private void OnDocumentPrint(CanvasPrintDocument sender, CanvasPrintEventArgs args)
+        {
+            var detailedOptions = PrintTaskOptionDetails.GetFromPrintTaskOptions(args.PrintTaskOptions);
+
+            int pageCountToPrint = (int)pdfDocument.PageCount;
+
+            for (uint i = 1; i <= pageCountToPrint; ++i)
+            {
+                using var ds = args.CreateDrawingSession();
+                var imageableRect = args.PrintTaskOptions.GetPageDescription(i).ImageableRect;
+
+                DrawPdfPage(sender, ds, i);
+            }
+        }
+
+        private void DrawPdfPage(CanvasPrintDocument sender, CanvasDrawingSession ds, uint pageNumber)
+        {
+            if (bitmaps?.Count == 0) return;
+
+            var cellAcross = new Vector2(cellSize.X, 0);
+            var cellDown = new Vector2(0, cellSize.Y);
+
+            var totalSize = cellAcross * columns + cellDown * rows;
+            Vector2 topLeft = (pageSize - totalSize) / 2;
+
+            int bitmapIndex = ((int)pageNumber - 1) * bitmapsPerPage;
+
+            for (int row = 0; row < rows; ++row)
+            {
+                for (int column = 0; column < columns; ++column)
+                {
+                    var cellTopLeft = topLeft + cellAcross * column + cellDown * row;
+                    var bitmapInfo = bitmaps[bitmapIndex % bitmaps.Count];
+                    var bitmapPos = cellTopLeft + (cellSize - bitmapInfo.Size.ToVector2()) / 2;
+
+                    ds.DrawImage(bitmapInfo, bitmapPos);
+
+                    bitmapIndex++;
+                }
+            }
+        }
+    }
+}

Wino.Core.UWP/Wino.Core.UWP.csproj

@@ -91,6 +91,7 @@
     <Compile Include="Models\Personalization\SystemAppTheme.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Services\PreferencesService.cs" />
+    <Compile Include="Services\PrintService.cs" />
     <Compile Include="Services\StartupBehaviorService.cs" />
     <Compile Include="Services\StatePersistenceService.cs" />
     <Compile Include="Services\WinoServerConnectionManager.cs" />
@@ -120,6 +121,9 @@
     <PackageReference Include="Microsoft.Toolkit.Uwp">
       <Version>7.1.3</Version>
     </PackageReference>
+    <PackageReference Include="Win2D.uwp">
+      <Version>1.28.0</Version>
+    </PackageReference>
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Wino.Core.Domain\Wino.Core.Domain.csproj">
@@ -140,6 +144,9 @@
       <Name>Windows Desktop Extensions for the UWP</Name>
     </SDKReference>
   </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Models\Printing\" />
+  </ItemGroup>
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '14.0' ">
     <VisualStudioVersion>14.0</VisualStudioVersion>
   </PropertyGroup>

Wino.Core/Services/ApplicationConfiguration.cs

@@ -7,7 +7,7 @@ namespace Wino.Core.Services
         public const string SharedFolderName = "WinoShared";
 
         public string ApplicationDataFolderPath { get; set; }
-
         public string PublisherSharedFolderPath { get; set; }
+        public string ApplicationTempFolderPath { get; set; }
     }
 }

Wino.Mail.ViewModels/MailRenderingPageViewModel.cs

@@ -26,6 +26,7 @@ using Wino.Mail.ViewModels.Data;
 using Wino.Mail.ViewModels.Messages;
 using Wino.Messaging.Client.Mails;
 using Wino.Messaging.Server;
+using IMailService = Wino.Core.Domain.Interfaces.IMailService;
 
 namespace Wino.Mail.ViewModels
 {
@@ -42,12 +43,17 @@ namespace Wino.Mail.ViewModels
         private readonly IContactService _contactService;
         private readonly IClipboardService _clipboardService;
         private readonly IUnsubscriptionService _unsubscriptionService;
+        private readonly IApplicationConfiguration _applicationConfiguration;
         private readonly IWinoServerConnectionManager _winoServerConnectionManager;
         private bool forceImageLoading = false;
 
         private MailItemViewModel initializedMailItemViewModel = null;
         private MimeMessageInformation initializedMimeMessageInformation = null;
 
+        // Func to get WebView2 to save current HTML as PDF to given location.
+        // Used in 'Save as' and 'Print' functionality.
+        public Func<string, Task<bool>> SaveHTMLasPDFFunc { get; set; }
+
         #region Properties
 
         public bool ShouldDisplayDownloadProgress => IsIndetermineProgress || (CurrentDownloadPercentage > 0 && CurrentDownloadPercentage <= 100);
@@ -121,12 +127,13 @@ namespace Wino.Mail.ViewModels
         public INativeAppService NativeAppService { get; }
         public IStatePersistanceService StatePersistenceService { get; }
         public IPreferencesService PreferencesService { get; }
+        public IPrintService PrintService { get; }
 
         public MailRenderingPageViewModel(IDialogService dialogService,
                                           INativeAppService nativeAppService,
                                           IUnderlyingThemeService underlyingThemeService,
                                           IMimeFileService mimeFileService,
-                                          Core.Domain.Interfaces.IMailService mailService,
+                                          IMailService mailService,
                                           IFileService fileService,
                                           IWinoRequestDelegator requestDelegator,
                                           IStatePersistanceService statePersistenceService,
@@ -134,12 +141,16 @@ namespace Wino.Mail.ViewModels
                                           IClipboardService clipboardService,
                                           IUnsubscriptionService unsubscriptionService,
                                           IPreferencesService preferencesService,
+                                          IPrintService printService,
+                                          IApplicationConfiguration applicationConfiguration,
                                           IWinoServerConnectionManager winoServerConnectionManager) : base(dialogService)
         {
             NativeAppService = nativeAppService;
             StatePersistenceService = statePersistenceService;
             _contactService = contactService;
             PreferencesService = preferencesService;
+            PrintService = printService;
+            _applicationConfiguration = applicationConfiguration;
             _winoServerConnectionManager = winoServerConnectionManager;
             _clipboardService = clipboardService;
             _unsubscriptionService = unsubscriptionService;
@@ -150,7 +161,6 @@ namespace Wino.Mail.ViewModels
             _requestDelegator = requestDelegator;
         }
 
-
         [RelayCommand]
         private async Task CopyClipboard(string copyText)
         {
@@ -243,14 +253,11 @@ namespace Wino.Mail.ViewModels
                 IsDarkWebviewRenderer = !IsDarkWebviewRenderer;
             else if (operation == MailOperation.SaveAs)
             {
-                // Save as PDF
+                await SaveAsAsync();
-                var pickedFolder = await DialogService.PickWindowsFolderAsync();
+            }
-
+            else if (operation == MailOperation.Print)
-                if (!string.IsNullOrEmpty(pickedFolder))
+            {
-                {
+                await PrintAsync();
-                    var fullPath = Path.Combine(pickedFolder, $"{initializedMailItemViewModel.FromAddress}.pdf");
-                    Messenger.Send(new SaveAsPDFRequested(fullPath));
-                }
             }
             else if (operation == MailOperation.Reply || operation == MailOperation.ReplyAll || operation == MailOperation.Forward)
             {
@@ -519,6 +526,9 @@ namespace Wino.Mail.ViewModels
             // Save As PDF
             MenuItems.Add(MailOperationMenuItem.Create(MailOperation.SaveAs, true, true));
 
+            // Print
+            MenuItems.Add(MailOperationMenuItem.Create(MailOperation.Print, true, true));
+
             if (initializedMailItemViewModel == null)
                 return;
 
@@ -659,6 +669,66 @@ namespace Wino.Mail.ViewModels
             }
         }
 
+        private async Task PrintAsync()
+        {
+            // Printing:
+            // 1. Let WebView2 save the current HTML as PDF to temporary location.
+            // 2. Saving as PDF will divide pages correctly for Win2D CanvasBitmap.
+            // 3. Use Win2D CanvasBitmap as IPrintDocumentSource and WinRT APIs to print the PDF.
+
+            try
+            {
+                var printFilePath = Path.Combine(_applicationConfiguration.ApplicationTempFolderPath, "print.pdf");
+
+                if (File.Exists(printFilePath)) File.Delete(printFilePath);
+
+                await SaveHTMLasPDFFunc(printFilePath);
+
+                var result = await PrintService.PrintPdfFileAsync(printFilePath, Subject);
+
+                if (result == PrintingResult.Submitted)
+                {
+                    DialogService.InfoBarMessage(Translator.DialogMessage_PrintingSuccessTitle, Translator.DialogMessage_PrintingSuccessMessage, InfoBarMessageType.Success);
+                }
+                else
+                {
+                    var message = string.Format(Translator.DialogMessage_PrintingFailedMessage, result);
+                    DialogService.InfoBarMessage(Translator.DialogMessage_PrintingFailedTitle, message, InfoBarMessageType.Warning);
+                }
+            }
+            catch (Exception ex)
+            {
+                DialogService.InfoBarMessage(string.Empty, ex.Message, InfoBarMessageType.Error);
+                Crashes.TrackError(ex);
+            }
+        }
+
+        private async Task SaveAsAsync()
+        {
+            try
+            {
+                var pickedFolder = await DialogService.PickWindowsFolderAsync();
+
+                if (string.IsNullOrEmpty(pickedFolder)) return;
+
+                var pdfFilePath = Path.Combine(pickedFolder, $"{initializedMailItemViewModel.FromAddress}.pdf");
+
+                bool isSaved = await SaveHTMLasPDFFunc(pdfFilePath);
+
+                if (isSaved)
+                {
+                    DialogService.InfoBarMessage(Translator.Info_PDFSaveSuccessTitle,
+                                                  string.Format(Translator.Info_PDFSaveSuccessMessage, pdfFilePath),
+                                                  InfoBarMessageType.Success);
+                }
+            }
+            catch (Exception ex)
+            {
+                DialogService.InfoBarMessage(Translator.Info_PDFSaveFailedTitle, ex.Message, InfoBarMessageType.Error);
+                Crashes.TrackError(ex);
+            }
+        }
+
         // Returns created file path.
         private async Task<string> SaveAttachmentInternalAsync(MailAttachmentViewModel attachmentViewModel, string saveFolderPath)
         {

Wino.Mail/App.xaml.cs

@@ -96,6 +96,7 @@ namespace Wino
             // Make sure the paths are setup on app start.
             _applicationFolderConfiguration.ApplicationDataFolderPath = ApplicationData.Current.LocalFolder.Path;
             _applicationFolderConfiguration.PublisherSharedFolderPath = ApplicationData.Current.GetPublisherCacheFolder(ApplicationConfiguration.SharedFolderName).Path;
+            _applicationFolderConfiguration.ApplicationTempFolderPath = ApplicationData.Current.TemporaryFolder.Path;
 
             _appServiceConnectionManager = Services.GetService<IWinoServerConnectionManager<AppServiceConnection>>();
             _themeService = Services.GetService<IThemeService>();

Wino.Mail/Controls/ControlConstants.cs

@@ -62,7 +62,7 @@ namespace Wino.Controls
             { WinoIconGlyph.Mail, "\uF509" },
             { WinoIconGlyph.More, "\uE824" },
             { WinoIconGlyph.CustomServer, "\uF509" },
-
+            { WinoIconGlyph.Print, "\uE954" },
             { WinoIconGlyph.Attachment, "\uE723" },
             { WinoIconGlyph.SortTextDesc, "\U000F3606" },
             { WinoIconGlyph.SortLinesDesc, "\U000F038A" },

Wino.Mail/Controls/WinoFontIcon.cs

@@ -69,7 +69,8 @@ namespace Wino.Controls
         Blocked,
         Message,
         New,
-        IMAP
+        IMAP,
+        Print
     }
 
     public class WinoFontIcon : FontIcon

Wino.Mail/Helpers/XamlHelpers.cs

@@ -144,6 +144,7 @@ namespace Wino.Helpers
                 MailOperation.ReplyAll => WinoIconGlyph.ReplyAll,
                 MailOperation.Zoom => WinoIconGlyph.Zoom,
                 MailOperation.SaveAs => WinoIconGlyph.Save,
+                MailOperation.Print => WinoIconGlyph.Print,
                 MailOperation.Find => WinoIconGlyph.Find,
                 MailOperation.Forward => WinoIconGlyph.Forward,
                 MailOperation.DarkEditor => WinoIconGlyph.DarkEditor,

Wino.Mail/Views/MailRenderingPage.xaml.cs

@@ -3,7 +3,6 @@ using System.Linq;
 using System.Text.Json;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.Messaging;
-using Microsoft.AppCenter.Crashes;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.UI.Xaml.Controls;
 using Microsoft.Web.WebView2.Core;
@@ -12,8 +11,6 @@ using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
 using Windows.UI.Xaml.Media.Animation;
 using Windows.UI.Xaml.Navigation;
-using Wino.Core.Domain;
-using Wino.Core.Domain.Enums;
 using Wino.Core.Domain.Interfaces;
 using Wino.Mail.ViewModels.Data;
 using Wino.Messaging.Client.Mails;
@@ -25,8 +22,7 @@ namespace Wino.Views
     public sealed partial class MailRenderingPage : MailRenderingPageAbstract,
         IRecipient<HtmlRenderingRequested>,
         IRecipient<CancelRenderingContentRequested>,
-        IRecipient<ApplicationThemeChanged>,
+        IRecipient<ApplicationThemeChanged>
-        IRecipient<SaveAsPDFRequested>
     {
         private readonly IPreferencesService _preferencesService = App.Current.Services.GetService<IPreferencesService>();
         private readonly IDialogService _dialogService = App.Current.Services.GetService<IDialogService>();
@@ -44,6 +40,11 @@ namespace Wino.Views
 
             Environment.SetEnvironmentVariable("WEBVIEW2_DEFAULT_BACKGROUND_COLOR", "00FFFFFF");
             Environment.SetEnvironmentVariable("WEBVIEW2_ADDITIONAL_BROWSER_ARGUMENTS", "--enable-features=OverlayScrollbar,msOverlayScrollbarWinStyle,msOverlayScrollbarWinStyleAnimation,msWebView2CodeCache");
+
+            ViewModel.SaveHTMLasPDFFunc = new Func<string, Task<bool>>((path) =>
+            {
+                return Chromium.CoreWebView2.PrintToPdfAsync(path, null).AsTask();
+            });
         }
 
         public override async void OnEditorThemeChanged()
@@ -277,26 +278,6 @@ namespace Wino.Views
             ViewModel.IsDarkWebviewRenderer = message.IsUnderlyingThemeDark;
         }
 
-        public async void Receive(SaveAsPDFRequested message)
-        {
-            try
-            {
-                bool isSaved = await Chromium.CoreWebView2.PrintToPdfAsync(message.FileSavePath, null);
-
-                if (isSaved)
-                {
-                    _dialogService.InfoBarMessage(Translator.Info_PDFSaveSuccessTitle,
-                                                  string.Format(Translator.Info_PDFSaveSuccessMessage, message.FileSavePath),
-                                                  InfoBarMessageType.Success);
-                }
-            }
-            catch (Exception ex)
-            {
-                _dialogService.InfoBarMessage(Translator.Info_PDFSaveFailedTitle, ex.Message, InfoBarMessageType.Error);
-                Crashes.TrackError(ex);
-            }
-        }
-
         private void InternetAddressClicked(object sender, RoutedEventArgs e)
         {
             if (sender is HyperlinkButton hyperlinkButton)

Wino.Messages/Client/Mails/PrintMailRequested.cs

@@ -0,0 +1,9 @@
+namespace Wino.Messaging.Client.Mails
+{
+    /// <summary>
+    /// When print mail is requested.
+    /// </summary>
+    /// <param name="PDFFilePath">Path to PDF file that WebView2 saved the html content as PDF.</param>
+    /// <param name="PrintTitle">Printer title on the dialog.</param>
+    public record PrintMailRequested(string PDFFilePath, string PrintTitle);
+}

Wino.Server/App.xaml.cs

@@ -84,6 +84,7 @@ namespace Wino.Server
 
             applicationFolderConfiguration.ApplicationDataFolderPath = ApplicationData.Current.LocalFolder.Path;
             applicationFolderConfiguration.PublisherSharedFolderPath = ApplicationData.Current.GetPublisherCacheFolder(ApplicationConfiguration.SharedFolderName).Path;
+            applicationFolderConfiguration.ApplicationTempFolderPath = ApplicationData.Current.TemporaryFolder.Path;
 
             // Setup logger
             var logInitializer = Services.GetService<ILogInitializer>();