code.grnet.gr Git - pithos-ms-client/blob - trunk/Pithos.Client.WPF/Shell/ShellViewModel.cs

   1 using System.Collections.Concurrent;
   2 using System.ComponentModel;
   3 using System.ComponentModel.Composition;
   4 using System.Diagnostics;
   5 using System.Diagnostics.Contracts;
   6 using System.IO;
   7 using System.Net;
   8 using System.Reflection;
   9 using System.Runtime.InteropServices;
  10 using System.ServiceModel;
  11 using System.ServiceModel.Description;
  12 using System.Threading.Tasks;
  13 using System.Windows;
  14 using Caliburn.Micro;
  15 using Hardcodet.Wpf.TaskbarNotification;
  16 using Pithos.Client.WPF.Configuration;
  17 using Pithos.Client.WPF.FileProperties;
  18 using Pithos.Client.WPF.Properties;
  19 using Pithos.Client.WPF.SelectiveSynch;
  20 using Pithos.Client.WPF.Services;
  21 using Pithos.Client.WPF.Shell;
  22 using Pithos.Core;
  23 using Pithos.Interfaces;
  24 using System;
  25 using System.Collections.Generic;
  26 using System.Linq;
  27 using System.Text;
  28 using Pithos.Network;
  29 using StatusService = Pithos.Client.WPF.Services.StatusService;
  30
  31 namespace Pithos.Client.WPF {
  32     using System.ComponentModel.Composition;
  33
  34
  35         ///<summary>
  36         /// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
  37         /// The shell also hosts the status service called by shell extensions to retrieve file info
  38         ///</summary>
  39         ///<remarks>
  40         /// It is a strange "shell" as its main visible element is an icon instead of a window
  41         /// The shell subscribes to the following events:
  42         /// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
  43         /// * SelectiveSynchChanges: Notifies that the user made changes to the selective synch folders for an account. Raised by the Selective Synch dialog. Located here because the monitors are here
  44         /// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
  45         ///</remarks>
  46         //TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
  47     [Export(typeof(IShell))]
  48     public class ShellViewModel : Screen, IStatusNotification, IShell,
  49         IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
  50     {
  51                 //The Status Checker provides the current synch state
  52                 //TODO: Could we remove the status checker and use events in its place?
  53         private IStatusChecker _statusChecker;
  54         private IEventAggregator _events;
  55
  56         public PithosSettings Settings { get; private set; }
  57
  58
  59         private Dictionary<string, PithosMonitor> _monitors = new Dictionary<string, PithosMonitor>();
  60                 ///<summary>
  61                 /// Dictionary of account monitors, keyed by account
  62                 ///</summary>
  63                 ///<remarks>
  64                 /// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
  65                 /// retrieve account and boject info
  66                 ///</remarks>
  67                 // TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
  68                 // TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
  69         public Dictionary<string, PithosMonitor> Monitors
  70         {
  71             get { return _monitors; }
  72         }
  73
  74
  75                 ///<summary>
  76                 /// The status service is used by Shell extensions to retrieve file status information
  77                 ///</summary>
  78                 //TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
  79         private ServiceHost _statusService { get; set; }
  80
  81                 //Logging in the Pithos client is provided by log4net
  82         private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("Pithos");
  83
  84                 ///<summary>
  85                 /// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
  86                 ///</summary>
  87                 ///<remarks>
  88                 /// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
  89                 ///</remarks>
  90         [ImportingConstructor]
  91         public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings)
  92         {
  93             try
  94             {
  95
  96                 _windowManager = windowManager;
  97                                 //CHECK: Caliburn doesn't need explicit command construction
  98                 //OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
  99                 _statusChecker = statusChecker;
 100                                 //The event subst
 101                 _events = events;
 102                 _events.Subscribe(this);
 103
 104                 Settings = settings;
 105
 106                 StatusMessage = "In Synch";
 107
 108                 _accounts.CollectionChanged += (sender, e) =>
 109                                                    {
 110                                                        NotifyOfPropertyChange(() => OpenFolderCaption);
 111                                                        NotifyOfPropertyChange(() => HasAccounts);
 112                                                    };
 113
 114             }
 115             catch (Exception exc)
 116             {
 117                 Log.Error("Error while starting the ShellViewModel",exc);
 118                 throw;
 119             }
 120         }
 121
 122
 123         protected override void OnActivate()
 124         {
 125             base.OnActivate();
 126
 127             StartMonitoring();
 128         }
 129
 130
 131         private async Task StartMonitoring()
 132         {
 133             try
 134             {
 135                 foreach (var account in Settings.Accounts)
 136                 {
 137                     await MonitorAccount(account);
 138                 }
 139                 _statusService = StatusService.Start();
 140             }
 141             catch (AggregateException exc)
 142             {
 143                 exc.Handle(e =>
 144                 {
 145                     Log.Error("Error while starting monitoring", e);
 146                     return true;
 147                 });
 148                 throw;
 149             }
 150         }
 151
 152         protected override void OnDeactivate(bool close)
 153         {
 154             base.OnDeactivate(close);
 155             if (close)
 156             {
 157                 StatusService.Stop(_statusService);
 158                 _statusService = null;
 159             }
 160         }
 161
 162         public Task MonitorAccount(AccountSettings account)
 163         {
 164             return Task.Factory.StartNew(() =>
 165             {
 166                 PithosMonitor monitor = null;
 167                 var accountName = account.AccountName;
 168
 169                 if (_monitors.TryGetValue(accountName, out monitor))
 170                 {
 171                     //If the account is active
 172                     if (account.IsActive)
 173                         //Start the monitor. It's OK to start an already started monitor,
 174                         //it will just ignore the call
 175                         StartMonitor(monitor).Wait();
 176                     else
 177                     {
 178                         //If the account is inactive
 179                         //Stop and remove the monitor
 180                         RemoveMonitor(accountName);
 181                     }
 182                     return;
 183                 }
 184
 185                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 186                 monitor = new PithosMonitor
 187                               {
 188                                   UserName = accountName,
 189                                   ApiKey = account.ApiKey,
 190                                   StatusNotification = this,
 191                                   RootPath = account.RootPath
 192                               };
 193                 //PithosMonitor uses MEF so we need to resolve it
 194                 IoC.BuildUp(monitor);
 195
 196                 var appSettings = Properties.Settings.Default;
 197                 monitor.AuthenticationUrl = account.ServerUrl;
 198
 199                 _monitors[accountName] = monitor;
 200
 201                 if (account.IsActive)
 202                 {
 203                     //Don't start a monitor if it doesn't have an account and ApiKey
 204                     if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 205                         String.IsNullOrWhiteSpace(monitor.ApiKey))
 206                         return;
 207                     StartMonitor(monitor);
 208                 }
 209             });
 210         }
 211
 212
 213         protected override void OnViewLoaded(object view)
 214         {
 215             UpdateStatus();
 216             var window = (Window)view;
 217             TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 218             base.OnViewLoaded(view);
 219         }
 220
 221
 222         #region Status Properties
 223
 224         private string _statusMessage;
 225         public string StatusMessage
 226         {
 227             get { return _statusMessage; }
 228             set
 229             {
 230                 _statusMessage = value;
 231                 NotifyOfPropertyChange(() => StatusMessage);
 232             }
 233         }
 234
 235         private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 236         public ObservableConcurrentCollection<AccountInfo> Accounts
 237         {
 238             get { return _accounts; }
 239         }
 240
 241             public bool HasAccounts
 242             {
 243             get { return _accounts.Count > 0; }
 244             }
 245
 246
 247         public string OpenFolderCaption
 248         {
 249             get
 250             {
 251                 return (_accounts.Count == 0)
 252                         ? "No Accounts Defined"
 253                         : "Open Pithos Folder";
 254             }
 255         }
 256
 257         private string _pauseSyncCaption="Pause Synching";
 258         public string PauseSyncCaption
 259         {
 260             get { return _pauseSyncCaption; }
 261             set
 262             {
 263                 _pauseSyncCaption = value;
 264                 NotifyOfPropertyChange(() => PauseSyncCaption);
 265             }
 266         }
 267
 268         private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 269         public ObservableConcurrentCollection<FileEntry> RecentFiles
 270         {
 271             get { return _recentFiles; }
 272         }
 273
 274
 275         private string _statusIcon="../Images/Pithos.ico";
 276         public string StatusIcon
 277         {
 278             get { return _statusIcon; }
 279             set
 280             {
 281                 //_statusIcon = value;
 282                 NotifyOfPropertyChange(() => StatusIcon);
 283             }
 284         }
 285
 286         #endregion
 287
 288         #region Commands
 289
 290         public void ShowPreferences()
 291         {
 292             Settings.Reload();
 293             var preferences = new PreferencesViewModel(_windowManager,_events, this,Settings);
 294             _windowManager.ShowDialog(preferences);
 295
 296         }
 297
 298         public void AboutPithos()
 299         {
 300             var about = new AboutViewModel();
 301             _windowManager.ShowWindow(about);
 302         }
 303
 304         public void SendFeedback()
 305         {
 306             var feedBack =  IoC.Get<FeedbackViewModel>();
 307             _windowManager.ShowWindow(feedBack);
 308         }
 309
 310         //public PithosCommand OpenPithosFolderCommand { get; private set; }
 311
 312         public void OpenPithosFolder()
 313         {
 314             var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 315             if (account == null)
 316                 return;
 317             Process.Start(account.RootPath);
 318         }
 319
 320         public void OpenPithosFolder(AccountInfo account)
 321         {
 322             Process.Start(account.AccountPath);
 323         }
 324
 325
 326 /*
 327         public void GoToSite()
 328         {
 329             var site = Properties.Settings.Default.PithosSite;
 330             Process.Start(site);
 331         }
 332 */
 333
 334         public void GoToSite(AccountInfo account)
 335         {
 336             /*var site = String.Format("{0}/ui/?token={1}&user={2}",
 337                 account.SiteUri,account.Token,
 338                 account.UserName);*/
 339             Process.Start(account.SiteUri);
 340         }
 341
 342         public void ShowFileProperties()
 343         {
 344             var account = Settings.Accounts.First(acc => acc.IsActive);
 345             var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 346             var files=dir.GetFiles();
 347             var r=new Random();
 348             var idx=r.Next(0, files.Length);
 349             ShowFileProperties(files[idx].FullName);
 350         }
 351
 352         public void ShowFileProperties(string filePath)
 353         {
 354             if (String.IsNullOrWhiteSpace(filePath))
 355                 throw new ArgumentNullException("filePath");
 356             if (!File.Exists(filePath))
 357                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 358             Contract.EndContractBlock();
 359
 360             var pair=(from monitor in  Monitors
 361                                where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 362                                    select monitor).FirstOrDefault();
 363             var account = pair.Key;
 364             var accountMonitor = pair.Value;
 365
 366             if (accountMonitor == null)
 367                 return;
 368
 369             var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 370
 371
 372
 373             var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 374             _windowManager.ShowWindow(fileProperties);
 375         }
 376
 377         public void ShowContainerProperties()
 378         {
 379             var account = Settings.Accounts.First(acc => acc.IsActive);
 380             var dir = new DirectoryInfo(account.RootPath);
 381             var fullName = (from folder in dir.EnumerateDirectories()
 382                             where (folder.Attributes & FileAttributes.Hidden) == 0
 383                             select folder.FullName).First();
 384             ShowContainerProperties(fullName);
 385         }
 386
 387         public void ShowContainerProperties(string filePath)
 388         {
 389             if (String.IsNullOrWhiteSpace(filePath))
 390                 throw new ArgumentNullException("filePath");
 391             if (!Directory.Exists(filePath))
 392                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 393             Contract.EndContractBlock();
 394
 395             var pair=(from monitor in  Monitors
 396                                where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 397                                    select monitor).FirstOrDefault();
 398             var account = pair.Key;
 399             var accountMonitor = pair.Value;
 400             var info = accountMonitor.GetContainerInfo(filePath);
 401
 402
 403
 404             var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 405             _windowManager.ShowWindow(containerProperties);
 406         }
 407
 408         public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 409         {
 410             if (currentInfo==null)
 411                 throw new ArgumentNullException("currentInfo");
 412             Contract.EndContractBlock();
 413
 414             var monitor = Monitors[currentInfo.Account];
 415             var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 416             return newInfo;
 417         }
 418
 419         public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 420         {
 421             if (container == null)
 422                 throw new ArgumentNullException("container");
 423             Contract.EndContractBlock();
 424
 425             var monitor = Monitors[container.Account];
 426             var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 427             return newInfo;
 428         }
 429
 430
 431         public void ToggleSynching()
 432         {
 433             bool isPaused=false;
 434             foreach (var pair in Monitors)
 435             {
 436                 var monitor = pair.Value;
 437                 monitor.Pause = !monitor.Pause;
 438                 isPaused = monitor.Pause;
 439             }
 440
 441             PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 442             var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 443             StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 444         }
 445
 446         public void ExitPithos()
 447         {
 448             foreach (var pair in Monitors)
 449             {
 450                 var monitor = pair.Value;
 451                 monitor.Stop();
 452             }
 453
 454             ((Window)GetView()).Close();
 455         }
 456         #endregion
 457
 458
 459         private Dictionary<PithosStatus, StatusInfo> iconNames = new List<StatusInfo>
 460             {
 461                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 462                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 463                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 464             }.ToDictionary(s => s.Status);
 465
 466         readonly IWindowManager _windowManager;
 467
 468
 469                 ///<summary>
 470                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 471                 ///</summary>
 472         public void UpdateStatus()
 473         {
 474             var pithosStatus = _statusChecker.GetPithosStatus();
 475
 476             if (iconNames.ContainsKey(pithosStatus))
 477             {
 478                 var info = iconNames[pithosStatus];
 479                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 480
 481                 Assembly assembly = Assembly.GetExecutingAssembly();
 482                 var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 483
 484
 485                 StatusMessage = String.Format("Pithos {0}\r\n{1}", fileVersion.FileVersion,info.StatusText);
 486             }
 487
 488             _events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 489         }
 490
 491
 492
 493         private Task StartMonitor(PithosMonitor monitor,int retries=0)
 494         {
 495             return Task.Factory.StartNew(() =>
 496             {
 497                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 498                 {
 499                     try
 500                     {
 501                         Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 502
 503                         monitor.Start();
 504                     }
 505                     catch (WebException exc)
 506                     {
 507                         if (AbandonRetry(monitor, retries))
 508                             return;
 509
 510                         if (IsUnauthorized(exc))
 511                         {
 512                             var message = String.Format("API Key Expired for {0}. Starting Renewal",monitor.UserName);
 513                             Log.Error(message,exc);
 514                             TryAuthorize(monitor,retries).Wait();
 515                         }
 516                         else
 517                         {
 518                             TryLater(monitor, exc,retries);
 519                         }
 520                     }
 521                     catch (Exception exc)
 522                     {
 523                         if (AbandonRetry(monitor, retries))
 524                             return;
 525
 526                         TryLater(monitor,exc,retries);
 527                     }
 528                 }
 529             });
 530         }
 531
 532         private bool AbandonRetry(PithosMonitor monitor, int retries)
 533         {
 534             if (retries > 1)
 535             {
 536                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 537                                             monitor.UserName);
 538                 _events.Publish(new Notification
 539                                     {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 540                 return true;
 541             }
 542             return false;
 543         }
 544
 545
 546         private async Task TryAuthorize(PithosMonitor monitor,int retries)
 547         {
 548             _events.Publish(new Notification { Title = "Authorization failed", Message = "Your API Key has probably expired. You will be directed to a page where you can renew it", Level = TraceLevel.Error });
 549
 550             try
 551             {
 552
 553                 var credentials = await PithosAccount.RetrieveCredentials(Settings.PithosLoginUrl);
 554
 555                 var account = Settings.Accounts.FirstOrDefault(act => act.AccountName == credentials.UserName);
 556                 account.ApiKey = credentials.Password;
 557                 monitor.ApiKey = credentials.Password;
 558                 Settings.Save();
 559                 await TaskEx.Delay(10000);
 560                 StartMonitor(monitor, retries + 1);
 561                 NotifyOfPropertyChange(()=>Accounts);
 562             }
 563             catch (AggregateException exc)
 564             {
 565                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 566                 Log.Error(message, exc.InnerException);
 567                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 568                 return;
 569             }
 570             catch (Exception exc)
 571             {
 572                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 573                 Log.Error(message, exc);
 574                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 575                 return;
 576
 577             }
 578
 579         }
 580
 581         private static bool IsUnauthorized(WebException exc)
 582         {
 583             if (exc==null)
 584                 throw new ArgumentNullException("exc");
 585             Contract.EndContractBlock();
 586
 587             var response = exc.Response as HttpWebResponse;
 588             if (response == null)
 589                 return false;
 590             return (response.StatusCode == HttpStatusCode.Unauthorized);
 591         }
 592
 593         private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 594         {
 595             var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 596             Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 597             _events.Publish(new Notification
 598                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 599             Log.Error(message, exc);
 600         }
 601
 602
 603         public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 604         {
 605             this.StatusMessage = status;
 606
 607             _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 608         }
 609
 610         public void NotifyChangedFile(string filePath)
 611         {
 612             var entry = new FileEntry {FullPath=filePath};
 613             IProducerConsumerCollection<FileEntry> files=this.RecentFiles;
 614             FileEntry popped;
 615             while (files.Count > 5)
 616                 files.TryTake(out popped);
 617             files.TryAdd(entry);
 618         }
 619
 620         public void NotifyAccount(AccountInfo account)
 621         {
 622             if (account== null)
 623                 return;
 624             //TODO: What happens to an existing account whose Token has changed?
 625             account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 626                 account.SiteUri, account.Token,
 627                 account.UserName);
 628
 629             if (Accounts.All(item => item.UserName != account.UserName))
 630                 Accounts.TryAdd(account);
 631
 632         }
 633
 634
 635         public void RemoveMonitor(string accountName)
 636         {
 637             if (String.IsNullOrWhiteSpace(accountName))
 638                 return;
 639
 640             var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 641             _accounts.TryRemove(accountInfo);
 642
 643             PithosMonitor monitor;
 644             if (Monitors.TryGetValue(accountName, out monitor))
 645             {
 646                 Monitors.Remove(accountName);
 647                 monitor.Stop();
 648             }
 649         }
 650
 651         public void RefreshOverlays()
 652         {
 653             foreach (var pair in Monitors)
 654             {
 655                 var monitor = pair.Value;
 656
 657                 var path = monitor.RootPath;
 658
 659                 if (String.IsNullOrWhiteSpace(path))
 660                     continue;
 661
 662                 if (!Directory.Exists(path) && !File.Exists(path))
 663                     continue;
 664
 665                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 666
 667                 try
 668                 {
 669                     NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 670                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 671                                                  pathPointer, IntPtr.Zero);
 672                 }
 673                 finally
 674                 {
 675                     Marshal.FreeHGlobal(pathPointer);
 676                 }
 677             }
 678         }
 679
 680         #region Event Handlers
 681
 682         public void Handle(SelectiveSynchChanges message)
 683         {
 684             var accountName = message.Account.AccountName;
 685             PithosMonitor monitor;
 686             if (_monitors.TryGetValue(accountName, out monitor))
 687             {
 688                 monitor.AddSelectivePaths(message.Added);
 689                 monitor.RemoveSelectivePaths(message.Removed);
 690
 691             }
 692
 693         }
 694
 695
 696         public void Handle(Notification notification)
 697         {
 698             if (!Settings.ShowDesktopNotifications)
 699                 return;
 700             BalloonIcon icon = BalloonIcon.None;
 701             switch (notification.Level)
 702             {
 703                 case TraceLevel.Error:
 704                     icon = BalloonIcon.Error;
 705                     break;
 706                 case TraceLevel.Info:
 707                 case TraceLevel.Verbose:
 708                     icon = BalloonIcon.Info;
 709                     break;
 710                 case TraceLevel.Warning:
 711                     icon = BalloonIcon.Warning;
 712                     break;
 713                 default:
 714                     icon = BalloonIcon.None;
 715                     break;
 716             }
 717
 718             if (Settings.ShowDesktopNotifications)
 719             {
 720                 var tv = (ShellView) this.GetView();
 721                 tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 722             }
 723         }
 724         #endregion
 725
 726         public void Handle(ShowFilePropertiesEvent message)
 727         {
 728             if (message == null)
 729                 throw new ArgumentNullException("message");
 730             if (String.IsNullOrWhiteSpace(message.FileName) )
 731                 throw new ArgumentException("message");
 732             Contract.EndContractBlock();
 733
 734             var fileName = message.FileName;
 735
 736             if (File.Exists(fileName))
 737                 this.ShowFileProperties(fileName);
 738             else if (Directory.Exists(fileName))
 739                 this.ShowContainerProperties(fileName);
 740         }
 741     }
 742 }