public CloudViewModel(
CloudState state,
CreateFolderViewModelFactory createFolderFactory,
RenameFileViewModelFactory renameFactory,
FileViewModelFactory fileFactory,
FolderViewModelFactory folderFactory,
IAuthViewModel auth,
IFileManager files,
ICloud cloud)
{
_cloud = cloud;
Folder = createFolderFactory(this);
Rename = renameFactory(this);
Auth = auth;
var canInteract = this
.WhenAnyValue(
x => x.Folder.IsVisible,
x => x.Rename.IsVisible,
(folder, rename) => !folder && !rename);
_canInteract = canInteract
.ToProperty(this, x => x.CanInteract);
var canRefresh = this
.WhenAnyValue(
x => x.Folder.IsVisible,
x => x.Rename.IsVisible,
x => x.Auth.IsAuthenticated,
(folder, rename, authenticated) => !folder && !rename && authenticated);
Refresh = ReactiveCommand.CreateFromTask(
() => cloud.GetFiles(CurrentPath),
canRefresh);
_files = Refresh
.Select(
items => items
.Select(file => fileFactory(file, this))
.OrderByDescending(file => file.IsFolder)
.ThenBy(file => file.Name)
.ToList())
.Where(items => Files == null || !items.SequenceEqual(Files))
.ToProperty(this, x => x.Files);
_isLoading = Refresh
.IsExecuting
.ToProperty(this, x => x.IsLoading);
_isReady = Refresh
.IsExecuting
.Skip(1)
.Select(executing => !executing)
.ToProperty(this, x => x.IsReady);
var canOpenCurrentPath = this
.WhenAnyValue(x => x.SelectedFile)
.Select(file => file != null && file.IsFolder)
.CombineLatest(Refresh.IsExecuting, canInteract, (folder, busy, ci) => folder && ci && !busy);
Open = ReactiveCommand.Create(
() => Path.Combine(CurrentPath, SelectedFile.Name),
canOpenCurrentPath);
var canCurrentPathGoBack = this
.WhenAnyValue(x => x.CurrentPath)
.Where(path => path != null)
.Select(path => path.Length > cloud.InitialPath.Length)
.CombineLatest(Refresh.IsExecuting, canInteract, (valid, busy, ci) => valid && ci && !busy);
Back = ReactiveCommand.Create(
() => Path.GetDirectoryName(CurrentPath),
canCurrentPathGoBack);
SetPath = ReactiveCommand.Create <string, string>(path => path);
_currentPath = Open
.Merge(Back)
.Merge(SetPath)
.Select(path => path ?? cloud.InitialPath)
.DistinctUntilChanged()
.Log(this, $"Current path changed in {cloud.Name}")
.ToProperty(this, x => x.CurrentPath, state.CurrentPath ?? cloud.InitialPath);
var getBreadCrumbs = ReactiveCommand.CreateFromTask(
() => cloud.GetBreadCrumbs(CurrentPath));
_breadCrumbs = getBreadCrumbs
.Where(items => items != null && items.Any())
.Select(items => items.Select(folder => folderFactory(folder, this)))
.ToProperty(this, x => x.BreadCrumbs);
_showBreadCrumbs = getBreadCrumbs
.ThrownExceptions
.Select(exception => false)
.Merge(getBreadCrumbs.Select(items => items != null && items.Any()))
.ObserveOn(RxApp.MainThreadScheduler)
.ToProperty(this, x => x.ShowBreadCrumbs);
_hideBreadCrumbs = this
.WhenAnyValue(x => x.ShowBreadCrumbs)
.Select(show => !show)
.ToProperty(this, x => x.HideBreadCrumbs);
this.WhenAnyValue(x => x.CurrentPath, x => x.IsReady)
.Where(x => x.Item1 != null && x.Item2)
.Select(_ => Unit.Default)
.InvokeCommand(getBreadCrumbs);
this.WhenAnyValue(x => x.CurrentPath)
.Skip(1)
.Select(_ => Unit.Default)
.InvokeCommand(Refresh);
this.WhenAnyValue(x => x.CurrentPath)
.Subscribe(_ => SelectedFile = null);
_isCurrentPathEmpty = this
.WhenAnyValue(x => x.Files)
.Skip(1)
.Where(items => items != null)
.Select(items => !items.Any())
.ToProperty(this, x => x.IsCurrentPathEmpty);
_hasErrorMessage = Refresh
.ThrownExceptions
.Select(exception => true)
.ObserveOn(RxApp.MainThreadScheduler)
.Merge(Refresh.Select(x => false))
.ToProperty(this, x => x.HasErrorMessage);
var canUploadToCurrentPath = this
.WhenAnyValue(x => x.CurrentPath)
.Select(path => path != null)
.CombineLatest(Refresh.IsExecuting, canInteract, (up, loading, can) => up && can && !loading);
UploadToCurrentPath = ReactiveCommand.CreateFromObservable(
() => Observable
.FromAsync(files.OpenRead)
.Where(response => response.Name != null && response.Stream != null)
.Select(args => _cloud.UploadFile(CurrentPath, args.Stream, args.Name))
.SelectMany(task => task.ToObservable()),
canUploadToCurrentPath);
UploadToCurrentPath.InvokeCommand(Refresh);
var canDownloadSelectedFile = this
.WhenAnyValue(x => x.SelectedFile)
.Select(file => file != null && !file.IsFolder)
.CombineLatest(Refresh.IsExecuting, canInteract, (down, loading, can) => down && !loading && can);
DownloadSelectedFile = ReactiveCommand.CreateFromObservable(
() => Observable
.FromAsync(() => files.OpenWrite(SelectedFile.Name))
.Where(stream => stream != null)
.Select(stream => _cloud.DownloadFile(SelectedFile.Path, stream))
.SelectMany(task => task.ToObservable()),
canDownloadSelectedFile);
var canLogout = cloud
.IsAuthorized
.DistinctUntilChanged()
.Select(loggedIn => loggedIn && (
cloud.SupportsDirectAuth ||
cloud.SupportsOAuth ||
cloud.SupportsHostAuth))
.CombineLatest(canInteract, (logout, interact) => logout && interact)
.ObserveOn(RxApp.MainThreadScheduler);
Logout = ReactiveCommand.CreateFromTask(cloud.Logout, canLogout);
_canLogout = canLogout
.ToProperty(this, x => x.CanLogout);
var canDeleteSelection = this
.WhenAnyValue(x => x.SelectedFile)
.Select(file => file != null && !file.IsFolder)
.CombineLatest(Refresh.IsExecuting, canInteract, (del, loading, ci) => del && !loading && ci);
DeleteSelectedFile = ReactiveCommand.CreateFromTask(
() => cloud.Delete(SelectedFile.Path, SelectedFile.IsFolder),
canDeleteSelection);
DeleteSelectedFile.InvokeCommand(Refresh);
var canUnselectFile = this
.WhenAnyValue(x => x.SelectedFile)
.Select(selection => selection != null)
.CombineLatest(Refresh.IsExecuting, canInteract, (sel, loading, ci) => sel && !loading && ci);
UnselectFile = ReactiveCommand.Create(
() => { SelectedFile = null; },
canUnselectFile);
UploadToCurrentPath.ThrownExceptions
.Merge(DeleteSelectedFile.ThrownExceptions)
.Merge(DownloadSelectedFile.ThrownExceptions)
.Merge(Refresh.ThrownExceptions)
.Merge(getBreadCrumbs.ThrownExceptions)
.Log(this, $"Exception occured in provider {cloud.Name}")
.Subscribe();
this.WhenAnyValue(x => x.CurrentPath)
.Subscribe(path => state.CurrentPath = path);
this.WhenAnyValue(x => x.Auth.IsAuthenticated)
.Select(authenticated => authenticated ? _cloud.Parameters?.Token : null)
.Subscribe(token => state.Token = token);
this.WhenAnyValue(x => x.Auth.IsAuthenticated)
.Select(authenticated => authenticated ? _cloud.Parameters?.User : null)
.Subscribe(user => state.User = user);
this.WhenActivated(ActivateAutoRefresh);
}
