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                 if (Settings.Accounts == null)
 136                 {
 137                     Settings.Accounts=new AccountsCollection();
 138                     Settings.Save();
 139                     return;
 140                 }
 141
 142                 foreach (var account in Settings.Accounts)
 143                 {
 144                     await MonitorAccount(account);
 145                 }
 146                 _statusService = StatusService.Start();
 147             }
 148             catch (AggregateException exc)
 149             {
 150                 exc.Handle(e =>
 151                 {
 152                     Log.Error("Error while starting monitoring", e);
 153                     return true;
 154                 });
 155                 throw;
 156             }
 157         }
 158
 159         protected override void OnDeactivate(bool close)
 160         {
 161             base.OnDeactivate(close);
 162             if (close)
 163             {
 164                 StatusService.Stop(_statusService);
 165                 _statusService = null;
 166             }
 167         }
 168
 169         public Task MonitorAccount(AccountSettings account)
 170         {
 171             return Task.Factory.StartNew(() =>
 172             {
 173                 PithosMonitor monitor = null;
 174                 var accountName = account.AccountName;
 175
 176                 if (_monitors.TryGetValue(accountName, out monitor))
 177                 {
 178                     //If the account is active
 179                     if (account.IsActive)
 180                         //Start the monitor. It's OK to start an already started monitor,
 181                         //it will just ignore the call
 182                         StartMonitor(monitor).Wait();
 183                     else
 184                     {
 185                         //If the account is inactive
 186                         //Stop and remove the monitor
 187                         RemoveMonitor(accountName);
 188                     }
 189                     return;
 190                 }
 191
 192                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 193                 monitor = new PithosMonitor
 194                               {
 195                                   UserName = accountName,
 196                                   ApiKey = account.ApiKey,
 197                                   StatusNotification = this,
 198                                   RootPath = account.RootPath
 199                               };
 200                 //PithosMonitor uses MEF so we need to resolve it
 201                 IoC.BuildUp(monitor);
 202
 203                 var appSettings = Properties.Settings.Default;
 204                 monitor.AuthenticationUrl = account.ServerUrl;
 205
 206                 _monitors[accountName] = monitor;
 207
 208                 if (account.IsActive)
 209                 {
 210                     //Don't start a monitor if it doesn't have an account and ApiKey
 211                     if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 212                         String.IsNullOrWhiteSpace(monitor.ApiKey))
 213                         return;
 214                     StartMonitor(monitor);
 215                 }
 216             });
 217         }
 218
 219
 220         protected override void OnViewLoaded(object view)
 221         {
 222             UpdateStatus();
 223             var window = (Window)view;
 224             TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 225             base.OnViewLoaded(view);
 226         }
 227
 228
 229         #region Status Properties
 230
 231         private string _statusMessage;
 232         public string StatusMessage
 233         {
 234             get { return _statusMessage; }
 235             set
 236             {
 237                 _statusMessage = value;
 238                 NotifyOfPropertyChange(() => StatusMessage);
 239             }
 240         }
 241
 242         private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 243         public ObservableConcurrentCollection<AccountInfo> Accounts
 244         {
 245             get { return _accounts; }
 246         }
 247
 248             public bool HasAccounts
 249             {
 250             get { return _accounts.Count > 0; }
 251             }
 252
 253
 254         public string OpenFolderCaption
 255         {
 256             get
 257             {
 258                 return (_accounts.Count == 0)
 259                         ? "No Accounts Defined"
 260                         : "Open Pithos Folder";
 261             }
 262         }
 263
 264         private string _pauseSyncCaption="Pause Synching";
 265         public string PauseSyncCaption
 266         {
 267             get { return _pauseSyncCaption; }
 268             set
 269             {
 270                 _pauseSyncCaption = value;
 271                 NotifyOfPropertyChange(() => PauseSyncCaption);
 272             }
 273         }
 274
 275         private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 276         public ObservableConcurrentCollection<FileEntry> RecentFiles
 277         {
 278             get { return _recentFiles; }
 279         }
 280
 281
 282         private string _statusIcon="../Images/Pithos.ico";
 283         public string StatusIcon
 284         {
 285             get { return _statusIcon; }
 286             set
 287             {
 288                 //_statusIcon = value;
 289                 NotifyOfPropertyChange(() => StatusIcon);
 290             }
 291         }
 292
 293         #endregion
 294
 295         #region Commands
 296
 297         public void ShowPreferences()
 298         {
 299             Settings.Reload();
 300             var preferences = new PreferencesViewModel(_windowManager,_events, this,Settings);
 301             _windowManager.ShowDialog(preferences);
 302
 303         }
 304
 305         public void AboutPithos()
 306         {
 307             var about = new AboutViewModel();
 308             _windowManager.ShowWindow(about);
 309         }
 310
 311         public void SendFeedback()
 312         {
 313             var feedBack =  IoC.Get<FeedbackViewModel>();
 314             _windowManager.ShowWindow(feedBack);
 315         }
 316
 317         //public PithosCommand OpenPithosFolderCommand { get; private set; }
 318
 319         public void OpenPithosFolder()
 320         {
 321             var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 322             if (account == null)
 323                 return;
 324             Process.Start(account.RootPath);
 325         }
 326
 327         public void OpenPithosFolder(AccountInfo account)
 328         {
 329             Process.Start(account.AccountPath);
 330         }
 331
 332
 333 /*
 334         public void GoToSite()
 335         {
 336             var site = Properties.Settings.Default.PithosSite;
 337             Process.Start(site);
 338         }
 339 */
 340
 341         public void GoToSite(AccountInfo account)
 342         {
 343             var site = String.Format("{0}/ui/?token={1}&user={2}",
 344                 account.SiteUri,account.Token,
 345                 account.UserName);
 346             Process.Start(site);
 347         }
 348
 349         public void ShowFileProperties()
 350         {
 351             var account = Settings.Accounts.First(acc => acc.IsActive);
 352             var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 353             var files=dir.GetFiles();
 354             var r=new Random();
 355             var idx=r.Next(0, files.Length);
 356             ShowFileProperties(files[idx].FullName);
 357         }
 358
 359         public void ShowFileProperties(string filePath)
 360         {
 361             if (String.IsNullOrWhiteSpace(filePath))
 362                 throw new ArgumentNullException("filePath");
 363             if (!File.Exists(filePath))
 364                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 365             Contract.EndContractBlock();
 366
 367             var pair=(from monitor in  Monitors
 368                                where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 369                                    select monitor).FirstOrDefault();
 370             var account = pair.Key;
 371             var accountMonitor = pair.Value;
 372
 373             if (accountMonitor == null)
 374                 return;
 375
 376             var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 377
 378
 379
 380             var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 381             _windowManager.ShowWindow(fileProperties);
 382         }
 383
 384         public void ShowContainerProperties()
 385         {
 386             var account = Settings.Accounts.First(acc => acc.IsActive);
 387             var dir = new DirectoryInfo(account.RootPath);
 388             var fullName = (from folder in dir.EnumerateDirectories()
 389                             where (folder.Attributes & FileAttributes.Hidden) == 0
 390                             select folder.FullName).First();
 391             ShowContainerProperties(fullName);
 392         }
 393
 394         public void ShowContainerProperties(string filePath)
 395         {
 396             if (String.IsNullOrWhiteSpace(filePath))
 397                 throw new ArgumentNullException("filePath");
 398             if (!Directory.Exists(filePath))
 399                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 400             Contract.EndContractBlock();
 401
 402             var pair=(from monitor in  Monitors
 403                                where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 404                                    select monitor).FirstOrDefault();
 405             var account = pair.Key;
 406             var accountMonitor = pair.Value;
 407             var info = accountMonitor.GetContainerInfo(filePath);
 408
 409
 410
 411             var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 412             _windowManager.ShowWindow(containerProperties);
 413         }
 414
 415         public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 416         {
 417             if (currentInfo==null)
 418                 throw new ArgumentNullException("currentInfo");
 419             Contract.EndContractBlock();
 420
 421             var monitor = Monitors[currentInfo.Account];
 422             var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 423             return newInfo;
 424         }
 425
 426         public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 427         {
 428             if (container == null)
 429                 throw new ArgumentNullException("container");
 430             Contract.EndContractBlock();
 431
 432             var monitor = Monitors[container.Account];
 433             var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 434             return newInfo;
 435         }
 436
 437
 438         public void ToggleSynching()
 439         {
 440             bool isPaused=false;
 441             foreach (var pair in Monitors)
 442             {
 443                 var monitor = pair.Value;
 444                 monitor.Pause = !monitor.Pause;
 445                 isPaused = monitor.Pause;
 446             }
 447
 448             PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 449             var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 450             StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 451         }
 452
 453         public void ExitPithos()
 454         {
 455             foreach (var pair in Monitors)
 456             {
 457                 var monitor = pair.Value;
 458                 monitor.Stop();
 459             }
 460
 461             ((Window)GetView()).Close();
 462         }
 463         #endregion
 464
 465
 466         private Dictionary<PithosStatus, StatusInfo> iconNames = new List<StatusInfo>
 467             {
 468                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 469                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 470                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 471             }.ToDictionary(s => s.Status);
 472
 473         readonly IWindowManager _windowManager;
 474
 475
 476                 ///<summary>
 477                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 478                 ///</summary>
 479         public void UpdateStatus()
 480         {
 481             var pithosStatus = _statusChecker.GetPithosStatus();
 482
 483             if (iconNames.ContainsKey(pithosStatus))
 484             {
 485                 var info = iconNames[pithosStatus];
 486                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 487
 488                 Assembly assembly = Assembly.GetExecutingAssembly();
 489                 var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 490
 491
 492                 StatusMessage = String.Format("Pithos {0}\r\n{1}", fileVersion.FileVersion,info.StatusText);
 493             }
 494
 495             _events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 496         }
 497
 498
 499
 500         private Task StartMonitor(PithosMonitor monitor,int retries=0)
 501         {
 502             return Task.Factory.StartNew(() =>
 503             {
 504                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 505                 {
 506                     try
 507                     {
 508                         Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 509
 510                         monitor.Start();
 511                     }
 512                     catch (WebException exc)
 513                     {
 514                         if (AbandonRetry(monitor, retries))
 515                             return;
 516
 517                         if (IsUnauthorized(exc))
 518                         {
 519                             var message = String.Format("API Key Expired for {0}. Starting Renewal",monitor.UserName);
 520                             Log.Error(message,exc);
 521                             TryAuthorize(monitor,retries).Wait();
 522                         }
 523                         else
 524                         {
 525                             TryLater(monitor, exc,retries);
 526                         }
 527                     }
 528                     catch (Exception exc)
 529                     {
 530                         if (AbandonRetry(monitor, retries))
 531                             return;
 532
 533                         TryLater(monitor,exc,retries);
 534                     }
 535                 }
 536             });
 537         }
 538
 539         private bool AbandonRetry(PithosMonitor monitor, int retries)
 540         {
 541             if (retries > 1)
 542             {
 543                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 544                                             monitor.UserName);
 545                 _events.Publish(new Notification
 546                                     {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 547                 return true;
 548             }
 549             return false;
 550         }
 551
 552
 553         private async Task TryAuthorize(PithosMonitor monitor,int retries)
 554         {
 555             _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 });
 556
 557             try
 558             {
 559
 560                 var credentials = await PithosAccount.RetrieveCredentials(Settings.PithosLoginUrl);
 561
 562                 var account = Settings.Accounts.FirstOrDefault(act => act.AccountName == credentials.UserName);
 563                 account.ApiKey = credentials.Password;
 564                 monitor.ApiKey = credentials.Password;
 565                 Settings.Save();
 566                 await TaskEx.Delay(10000);
 567                 StartMonitor(monitor, retries + 1);
 568                 NotifyOfPropertyChange(()=>Accounts);
 569             }
 570             catch (AggregateException exc)
 571             {
 572                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 573                 Log.Error(message, exc.InnerException);
 574                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 575                 return;
 576             }
 577             catch (Exception exc)
 578             {
 579                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 580                 Log.Error(message, exc);
 581                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 582                 return;
 583
 584             }
 585
 586         }
 587
 588         private static bool IsUnauthorized(WebException exc)
 589         {
 590             if (exc==null)
 591                 throw new ArgumentNullException("exc");
 592             Contract.EndContractBlock();
 593
 594             var response = exc.Response as HttpWebResponse;
 595             if (response == null)
 596                 return false;
 597             return (response.StatusCode == HttpStatusCode.Unauthorized);
 598         }
 599
 600         private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 601         {
 602             var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 603             Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 604             _events.Publish(new Notification
 605                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 606             Log.Error(message, exc);
 607         }
 608
 609
 610         public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 611         {
 612             this.StatusMessage = status;
 613
 614             _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 615         }
 616
 617         public void NotifyChangedFile(string filePath)
 618         {
 619             var entry = new FileEntry {FullPath=filePath};
 620             IProducerConsumerCollection<FileEntry> files=this.RecentFiles;
 621             FileEntry popped;
 622             while (files.Count > 5)
 623                 files.TryTake(out popped);
 624             files.TryAdd(entry);
 625         }
 626
 627         public void NotifyAccount(AccountInfo account)
 628         {
 629             if (account== null)
 630                 return;
 631
 632             account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 633                 account.SiteUri, account.Token,
 634                 account.UserName);
 635
 636             IProducerConsumerCollection<AccountInfo> accounts = Accounts;
 637             for (var i = 0; i < _accounts.Count; i++)
 638             {
 639                 AccountInfo item;
 640                 if (accounts.TryTake(out item))
 641                 {
 642                     if (item.UserName!=account.UserName)
 643                     {
 644                         accounts.TryAdd(item);
 645                     }
 646                 }
 647             }
 648
 649             accounts.TryAdd(account);
 650         }
 651
 652
 653         public void RemoveMonitor(string accountName)
 654         {
 655             if (String.IsNullOrWhiteSpace(accountName))
 656                 return;
 657
 658             var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 659             _accounts.TryRemove(accountInfo);
 660
 661             PithosMonitor monitor;
 662             if (Monitors.TryGetValue(accountName, out monitor))
 663             {
 664                 Monitors.Remove(accountName);
 665                 monitor.Stop();
 666             }
 667         }
 668
 669         public void RefreshOverlays()
 670         {
 671             foreach (var pair in Monitors)
 672             {
 673                 var monitor = pair.Value;
 674
 675                 var path = monitor.RootPath;
 676
 677                 if (String.IsNullOrWhiteSpace(path))
 678                     continue;
 679
 680                 if (!Directory.Exists(path) && !File.Exists(path))
 681                     continue;
 682
 683                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 684
 685                 try
 686                 {
 687                     NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 688                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 689                                                  pathPointer, IntPtr.Zero);
 690                 }
 691                 finally
 692                 {
 693                     Marshal.FreeHGlobal(pathPointer);
 694                 }
 695             }
 696         }
 697
 698         #region Event Handlers
 699
 700         public void Handle(SelectiveSynchChanges message)
 701         {
 702             var accountName = message.Account.AccountName;
 703             PithosMonitor monitor;
 704             if (_monitors.TryGetValue(accountName, out monitor))
 705             {
 706                 monitor.AddSelectivePaths(message.Added);
 707                 monitor.RemoveSelectivePaths(message.Removed);
 708
 709             }
 710
 711         }
 712
 713
 714         public void Handle(Notification notification)
 715         {
 716             if (!Settings.ShowDesktopNotifications)
 717                 return;
 718             BalloonIcon icon = BalloonIcon.None;
 719             switch (notification.Level)
 720             {
 721                 case TraceLevel.Error:
 722                     icon = BalloonIcon.Error;
 723                     break;
 724                 case TraceLevel.Info:
 725                 case TraceLevel.Verbose:
 726                     icon = BalloonIcon.Info;
 727                     break;
 728                 case TraceLevel.Warning:
 729                     icon = BalloonIcon.Warning;
 730                     break;
 731                 default:
 732                     icon = BalloonIcon.None;
 733                     break;
 734             }
 735
 736             if (Settings.ShowDesktopNotifications)
 737             {
 738                 var tv = (ShellView) this.GetView();
 739                 tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 740             }
 741         }
 742         #endregion
 743
 744         public void Handle(ShowFilePropertiesEvent message)
 745         {
 746             if (message == null)
 747                 throw new ArgumentNullException("message");
 748             if (String.IsNullOrWhiteSpace(message.FileName) )
 749                 throw new ArgumentException("message");
 750             Contract.EndContractBlock();
 751
 752             var fileName = message.FileName;
 753
 754             if (File.Exists(fileName))
 755                 this.ShowFileProperties(fileName);
 756             else if (Directory.Exists(fileName))
 757                 this.ShowContainerProperties(fileName);
 758         }
 759     }
 760 }