public ExerciseViewModel(ISchedulerService schedulerService, Exercise model, IObservable<ExecutionContext> executionContext)
{
schedulerService.AssertNotNull(nameof(schedulerService));
model.AssertNotNull(nameof(model));
executionContext.AssertNotNull(nameof(executionContext));
this.disposables = new CompositeDisposable();
this.model = model;
executionContext
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.ExecutionContext = x)
.AddTo(this.disposables);
Observable
.CombineLatest(
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(ec => ec == null ? Observable.Never<TimeSpan>() : ec.WhenAnyValue(x => x.SkipAhead))
.Switch(),
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(ec => ec == null ? Observable.Never<Exercise>() : ec.WhenAnyValue(x => x.CurrentExercise))
.Switch(),
(skip, current) => skip == TimeSpan.Zero && current == this.model)
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.IsActive = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(
ec =>
ec == null
? Observable.Return(TimeSpan.Zero)
: ec
.WhenAnyValue(x => x.CurrentExerciseProgress)
.Where(_ => ec.CurrentExercise == this.model)
.StartWith(TimeSpan.Zero))
.Switch()
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.ProgressTimeSpan = x)
.AddTo(this.disposables);
this
.WhenAny(
x => x.Duration,
x => x.ProgressTimeSpan,
(duration, progressTimeSpan) => progressTimeSpan.Value.TotalMilliseconds / duration.Value.TotalMilliseconds)
.Select(progressRatio => double.IsNaN(progressRatio) || double.IsInfinity(progressRatio) ? 0d : progressRatio)
.Select(progressRatio => Math.Min(1d, progressRatio))
.Select(progressRatio => Math.Max(0d, progressRatio))
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.Progress = x)
.AddTo(this.disposables);
}
public ExerciseViewModel(ISchedulerService schedulerService, Exercise model, IObservable <ExecutionContext> executionContext)
{
schedulerService.AssertNotNull(nameof(schedulerService));
model.AssertNotNull(nameof(model));
executionContext.AssertNotNull(nameof(executionContext));
this.disposables = new CompositeDisposable();
this.model = model;
executionContext
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.ExecutionContext = x)
.AddTo(this.disposables);
Observable
.CombineLatest(
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(ec => ec == null ? Observable.Never <TimeSpan>() : ec.WhenAnyValue(x => x.SkipAhead))
.Switch(),
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(ec => ec == null ? Observable.Never <Exercise>() : ec.WhenAnyValue(x => x.CurrentExercise))
.Switch(),
(skip, current) => skip == TimeSpan.Zero && current == this.model)
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.IsActive = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(
ec =>
ec == null
? Observable.Return(TimeSpan.Zero)
: ec
.WhenAnyValue(x => x.CurrentExerciseProgress)
.Where(_ => ec.CurrentExercise == this.model)
.StartWith(TimeSpan.Zero))
.Switch()
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.ProgressTimeSpan = x)
.AddTo(this.disposables);
this
.WhenAny(
x => x.Duration,
x => x.ProgressTimeSpan,
(duration, progressTimeSpan) => progressTimeSpan.Value.TotalMilliseconds / duration.Value.TotalMilliseconds)
.Select(progressRatio => double.IsNaN(progressRatio) || double.IsInfinity(progressRatio) ? 0d : progressRatio)
.Select(progressRatio => Math.Min(1d, progressRatio))
.Select(progressRatio => Math.Max(0d, progressRatio))
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.Progress = x)
.AddTo(this.disposables);
}
public AudioService(ISchedulerService schedulerService)
{
schedulerService.AssertNotNull(nameof(schedulerService));
this.schedulerService = schedulerService;
}
public ExerciseProgramViewModel(
ILoggerService loggerService,
ISchedulerService schedulerService,
IScreen hostScreen,
ExerciseProgram model)
{
loggerService.AssertNotNull(nameof(loggerService));
schedulerService.AssertNotNull(nameof(schedulerService));
hostScreen.AssertNotNull(nameof(hostScreen));
model.AssertNotNull(nameof(model));
this.logger = loggerService.GetLogger(this.GetType());
this.schedulerService = schedulerService;
this.model = model;
this.hostScreen = hostScreen;
this.disposables = new CompositeDisposable();
this.exercises = this.model.Exercises.CreateDerivedCollection(x => new ExerciseViewModel(schedulerService, x, this.WhenAnyValue(y => y.ExecutionContext)));
this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.ExecutionContext.IsCancelled,
(ec, isCancelled) => ec != null && !isCancelled)
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.IsStarted = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(x => x == null ? Observable.Return(false) : x.WhenAnyValue(y => y.IsPaused))
.Switch()
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.IsPaused = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(x => x == null ? Observable.Return(TimeSpan.Zero) : x.WhenAnyValue(y => y.Progress))
.Switch()
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.ProgressTimeSpan = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ProgressTimeSpan)
.Select(x => x.TotalMilliseconds / this.model.Duration.TotalMilliseconds)
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.Progress = x)
.AddTo(this.disposables);
this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.ExecutionContext.CurrentExercise,
(ec, currentExercise) => ec == null ? null : currentExercise)
.Select(x => this.Exercises.SingleOrDefault(y => y.Model == x))
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.CurrentExercise = x)
.AddTo(this.disposables);
var canStart = this
.WhenAnyValue(x => x.IsStarted)
.Select(x => !x)
.ObserveOn(schedulerService.MainScheduler)
.Do(x => System.Diagnostics.Debug.WriteLine("CanStart changing to " + x));
this.startCommand = ReactiveCommand
.CreateAsyncObservable(canStart, this.OnStartAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
var canPause = this
.WhenAnyValue(x => x.IsStarted)
.CombineLatest(this.WhenAnyValue(x => x.ExecutionContext.IsPaused), (isStarted, isPaused) => isStarted && !isPaused)
.ObserveOn(schedulerService.MainScheduler);
this.pauseCommand = ReactiveCommand
.CreateAsyncObservable(canPause, this.OnPauseAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
var canResume = this
.WhenAnyValue(x => x.IsStarted)
.CombineLatest(this.WhenAnyValue(x => x.ExecutionContext.IsPaused), (isStarted, isPaused) => isStarted && isPaused)
.ObserveOn(schedulerService.MainScheduler);
this.resumeCommand = ReactiveCommand
.CreateAsyncObservable(canResume, this.OnResumeAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
var canSkipBackwards = this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.ProgressTimeSpan,
(ec, progress) => new { ExecutionContext = ec, Progress = progress })
.Select(x => x.ExecutionContext != null && x.Progress >= skipBackwardsThreshold)
.ObserveOn(schedulerService.MainScheduler);
this.skipBackwardsCommand = ReactiveCommand
.CreateAsyncObservable(canSkipBackwards, this.OnSkipBackwardsAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
var canSkipForwards = this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.CurrentExercise,
(ec, currentExercise) => new { ExecutionContext = ec, CurrentExercise = currentExercise })
.Select(x => x.ExecutionContext != null && x.CurrentExercise != null && x.CurrentExercise != this.exercises.LastOrDefault())
.ObserveOn(schedulerService.MainScheduler);
this.skipForwardsCommand = ReactiveCommand
.CreateAsyncObservable(canSkipForwards, this.OnSkipForwardsAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
this.startCommand
.CanExecuteObservable
.Subscribe(x => this.IsStartVisible = x)
.AddTo(this.disposables);
this.pauseCommand
.CanExecuteObservable
.Subscribe(x => this.IsPauseVisible = x)
.AddTo(this.disposables);
this.resumeCommand
.CanExecuteObservable
.Subscribe(x => this.IsResumeVisible = x)
.AddTo(this.disposables);
this.startCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("start", ex))
.AddTo(this.disposables);
this.pauseCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("pause", ex))
.AddTo(this.disposables);
this.resumeCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("resume", ex))
.AddTo(this.disposables);
this.skipBackwardsCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("skip backwards", ex))
.AddTo(this.disposables);
this.skipForwardsCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("skip forwards", ex))
.AddTo(this.disposables);
// we don't use a reactive command here because switching in different commands causes it to get confused and
// command binding leaves the target button disabled. We could also have not used command binding to get around
// this problem
this.playbackCommand = new PlaybackCommandImpl(this);
// cancel the exercise program if the user navigates away
this
.hostScreen
.Router
.NavigationStack
.ItemsRemoved
.OfType<ExerciseProgramViewModel>()
.SelectMany(x => x.StopAsync())
.Subscribe()
.AddTo(this.disposables);
}
public DelayService(ISchedulerService schedulerService)
{
schedulerService.AssertNotNull(nameof(schedulerService));
this.schedulerService = schedulerService;
}
public ExerciseProgramsViewModel(
IAudioService audioService,
IDelayService delayService,
IExerciseDocumentService exerciseDocumentService,
ILoggerService loggerService,
ISchedulerService schedulerService,
ISpeechService speechService,
IStateService stateService,
IScreen hostScreen,
ExerciseProgramViewModelFactory exerciseProgramViewModelFactory)
{
audioService.AssertNotNull(nameof(audioService));
delayService.AssertNotNull(nameof(delayService));
exerciseDocumentService.AssertNotNull(nameof(exerciseDocumentService));
loggerService.AssertNotNull(nameof(loggerService));
schedulerService.AssertNotNull(nameof(schedulerService));
speechService.AssertNotNull(nameof(speechService));
stateService.AssertNotNull(nameof(stateService));
hostScreen.AssertNotNull(nameof(hostScreen));
exerciseProgramViewModelFactory.AssertNotNull(nameof(exerciseProgramViewModelFactory));
this.exerciseDocumentService = exerciseDocumentService;
this.stateService = stateService;
this.logger = loggerService.GetLogger(this.GetType());
this.hostScreen = hostScreen;
this.disposables = new CompositeDisposable();
var documentsFromCache = this
.stateService
.GetAsync <string>(exerciseProgramsCacheKey)
.Where(x => x != null)
.Select(x => new DocumentSourceWith <string>(DocumentSource.Cache, x));
var documentsFromService = this
.exerciseDocumentService
.ExerciseDocument
.Where(x => x != null)
.Select(x => new DocumentSourceWith <string>(DocumentSource.Service, x));
var documents = documentsFromCache
.Catch((Exception ex) => Observable.Empty <DocumentSourceWith <string> >())
.Concat(documentsFromService)
.Do(x => this.logger.Debug("Received document from {0}.", x.Source))
.Publish();
var safeDocuments = documents
.Catch((Exception ex) => Observable.Empty <DocumentSourceWith <string> >());
var results = documents
.ObserveOn(schedulerService.TaskPoolScheduler)
.Select(
x =>
{
IResult <ExercisePrograms> parsedExercisePrograms;
using (this.logger.Perf("Parsing exercise programs from {0}.", x.Source))
{
parsedExercisePrograms = ExercisePrograms.TryParse(x.Item, audioService, delayService, loggerService, speechService);
}
return(new DocumentSourceWith <IResult <ExercisePrograms> >(x.Source, parsedExercisePrograms));
})
.Publish();
var safeResults = results
.Catch((Exception ex) => Observable.Empty <DocumentSourceWith <IResult <ExercisePrograms> > >());
safeResults
.Select(x => x.Item.WasSuccessful ? null : x.Item.ToString())
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.ParseErrorMessage = x)
.AddTo(this.disposables);
results
.Select(x => !x.Item.WasSuccessful ? ExerciseProgramsViewModelStatus.ParseFailed : x.Source == DocumentSource.Cache ? ExerciseProgramsViewModelStatus.LoadedFromCache : ExerciseProgramsViewModelStatus.LoadedFromService)
.Catch((Exception ex) => Observable.Return(ExerciseProgramsViewModelStatus.LoadFailed))
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.Status = x)
.AddTo(this.disposables);
safeResults
.Select(x => x.Item.WasSuccessful ? x.Item.Value : null)
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.Model = x)
.AddTo(this.disposables);
this.WhenAnyValue(x => x.Model)
.Select(x => x == null ? null : x.Programs.CreateDerivedCollection(y => exerciseProgramViewModelFactory(y)))
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.Programs = x)
.AddTo(this.disposables);
safeDocuments
.Where(x => x.Source == DocumentSource.Service)
.SelectMany(x => this.stateService.SetAsync(exerciseProgramsCacheKey, x.Item))
.Subscribe()
.AddTo(this.disposables);
results
.Connect()
.AddTo(this.disposables);
documents
.Connect()
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.SelectedProgram)
.Where(x => x != null)
.Subscribe(x => this.hostScreen.Router.Navigate.Execute(x))
.AddTo(this.disposables);
this
.hostScreen
.Router
.CurrentViewModel
.OfType <ExerciseProgramsViewModel>()
.Subscribe(x => x.SelectedProgram = null)
.AddTo(this.disposables);
}
public ExerciseProgramViewModel(
ILoggerService loggerService,
ISchedulerService schedulerService,
IScreen hostScreen,
ExerciseProgram model)
{
loggerService.AssertNotNull(nameof(loggerService));
schedulerService.AssertNotNull(nameof(schedulerService));
hostScreen.AssertNotNull(nameof(hostScreen));
model.AssertNotNull(nameof(model));
this.logger = loggerService.GetLogger(this.GetType());
this.schedulerService = schedulerService;
this.model = model;
this.hostScreen = hostScreen;
this.disposables = new CompositeDisposable();
this.exercises = this.model.Exercises.CreateDerivedCollection(x => new ExerciseViewModel(schedulerService, x, this.WhenAnyValue(y => y.ExecutionContext)));
this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.ExecutionContext.IsCancelled,
(ec, isCancelled) => ec != null && !isCancelled)
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.IsStarted = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(x => x == null ? Observable.Return(false) : x.WhenAnyValue(y => y.IsPaused))
.Switch()
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.IsPaused = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ExecutionContext)
.Select(x => x == null ? Observable.Return(TimeSpan.Zero) : x.WhenAnyValue(y => y.Progress))
.Switch()
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.ProgressTimeSpan = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ProgressTimeSpan)
.Select(x => x.TotalMilliseconds / this.model.Duration.TotalMilliseconds)
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.Progress = x)
.AddTo(this.disposables);
this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.ExecutionContext.CurrentExercise,
(ec, currentExercise) => ec == null ? null : currentExercise)
.Select(x => this.Exercises.SingleOrDefault(y => y.Model == x))
.ObserveOn(schedulerService.MainScheduler)
.Subscribe(x => this.CurrentExercise = x)
.AddTo(this.disposables);
var canStart = this
.WhenAnyValue(x => x.IsStarted)
.Select(x => !x)
.ObserveOn(schedulerService.MainScheduler)
.Do(x => System.Diagnostics.Debug.WriteLine("CanStart changing to " + x));
this.startCommand = ReactiveCommand
.CreateAsyncObservable(canStart, this.OnStartAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
var canPause = this
.WhenAnyValue(x => x.IsStarted)
.CombineLatest(this.WhenAnyValue(x => x.ExecutionContext.IsPaused), (isStarted, isPaused) => isStarted && !isPaused)
.ObserveOn(schedulerService.MainScheduler);
this.pauseCommand = ReactiveCommand
.CreateAsyncObservable(canPause, this.OnPauseAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
var canResume = this
.WhenAnyValue(x => x.IsStarted)
.CombineLatest(this.WhenAnyValue(x => x.ExecutionContext.IsPaused), (isStarted, isPaused) => isStarted && isPaused)
.ObserveOn(schedulerService.MainScheduler);
this.resumeCommand = ReactiveCommand
.CreateAsyncObservable(canResume, this.OnResumeAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
var canSkipBackwards = this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.ProgressTimeSpan,
(ec, progress) => new { ExecutionContext = ec, Progress = progress })
.Select(x => x.ExecutionContext != null && x.Progress >= skipBackwardsThreshold)
.ObserveOn(schedulerService.MainScheduler);
this.skipBackwardsCommand = ReactiveCommand
.CreateAsyncObservable(canSkipBackwards, this.OnSkipBackwardsAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
var canSkipForwards = this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.CurrentExercise,
(ec, currentExercise) => new { ExecutionContext = ec, CurrentExercise = currentExercise })
.Select(x => x.ExecutionContext != null && x.CurrentExercise != null && x.CurrentExercise != this.exercises.LastOrDefault())
.ObserveOn(schedulerService.MainScheduler);
this.skipForwardsCommand = ReactiveCommand
.CreateAsyncObservable(canSkipForwards, this.OnSkipForwardsAsync, schedulerService.MainScheduler)
.AddTo(this.disposables);
this.startCommand
.CanExecuteObservable
.Subscribe(x => this.IsStartVisible = x)
.AddTo(this.disposables);
this.pauseCommand
.CanExecuteObservable
.Subscribe(x => this.IsPauseVisible = x)
.AddTo(this.disposables);
this.resumeCommand
.CanExecuteObservable
.Subscribe(x => this.IsResumeVisible = x)
.AddTo(this.disposables);
this.startCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("start", ex))
.AddTo(this.disposables);
this.pauseCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("pause", ex))
.AddTo(this.disposables);
this.resumeCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("resume", ex))
.AddTo(this.disposables);
this.skipBackwardsCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("skip backwards", ex))
.AddTo(this.disposables);
this.skipForwardsCommand
.ThrownExceptions
.Subscribe(ex => this.OnThrownException("skip forwards", ex))
.AddTo(this.disposables);
// we don't use a reactive command here because switching in different commands causes it to get confused and
// command binding leaves the target button disabled. We could also have not used command binding to get around
// this problem
this.playbackCommand = new PlaybackCommandImpl(this);
// cancel the exercise program if the user navigates away
this
.hostScreen
.Router
.NavigationStack
.ItemsRemoved
.OfType <ExerciseProgramViewModel>()
.SelectMany(x => x.StopAsync())
.Subscribe()
.AddTo(this.disposables);
}