public ExerciseProgramViewModelBuilder()
{
this.loggerService = new LoggerServiceMock(MockBehavior.Loose);
this.schedulerService = new SchedulerServiceMock(MockBehavior.Loose);
this.hostScreen = new ScreenMock(MockBehavior.Loose);
this.model = new ExerciseProgramBuilder();
}
public ExerciseProgramViewModelBuilder WithModel(ExerciseProgram model)
{
this.model = model;
return this;
}
public ExerciseProgramViewModel(
ILoggerService loggerService,
IScheduler scheduler,
IScreen hostScreen,
ExerciseProgram model)
{
Ensure.ArgumentNotNull(loggerService, nameof(loggerService));
Ensure.ArgumentNotNull(scheduler, nameof(scheduler));
Ensure.ArgumentNotNull(hostScreen, nameof(hostScreen));
Ensure.ArgumentNotNull(model, nameof(model));
this.logger = loggerService.GetLogger(this.GetType());
this.scheduler = scheduler;
this.model = model;
this.hostScreen = hostScreen;
this.disposables = new CompositeDisposable();
this.exercises = this.model.Exercises.CreateDerivedCollection(x => new ExerciseViewModel(scheduler, x, this.WhenAnyValue(y => y.ExecutionContext)));
this
.WhenAnyValue(
x => x.ExecutionContext,
x => x.ExecutionContext.IsCancelled,
(ec, isCancelled) => ec != null && !isCancelled)
.ObserveOn(scheduler)
.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(scheduler)
.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(scheduler)
.Subscribe(x => this.ProgressTimeSpan = x)
.AddTo(this.disposables);
this
.WhenAnyValue(x => x.ProgressTimeSpan)
.Select(x => x.TotalMilliseconds / this.model.Duration.TotalMilliseconds)
.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(scheduler)
.Subscribe(x => this.CurrentExercise = x)
.AddTo(this.disposables);
var canStart = this
.WhenAnyValue(x => x.IsStarted)
.Select(x => !x);
this.startCommand = ReactiveCommand
.CreateFromObservable<TimeSpan?, Unit>(this.OnStart, canStart, scheduler)
.AddTo(this.disposables);
var canPause = this
.WhenAnyValue(x => x.IsStarted)
.CombineLatest(this.WhenAnyValue(x => x.ExecutionContext.IsPaused), (isStarted, isPaused) => isStarted && !isPaused)
.ObserveOn(scheduler);
this.pauseCommand = ReactiveCommand
.CreateFromObservable(this.OnPause, canPause, scheduler)
.AddTo(this.disposables);
var canResume = this
.WhenAnyValue(x => x.IsStarted)
.CombineLatest(this.WhenAnyValue(x => x.ExecutionContext.IsPaused), (isStarted, isPaused) => isStarted && isPaused)
.ObserveOn(scheduler);
this.resumeCommand = ReactiveCommand
.CreateFromObservable(this.OnResume, canResume, scheduler)
.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(scheduler);
this.skipBackwardsCommand = ReactiveCommand
.CreateFromObservable(this.OnSkipBackwards, canSkipBackwards, scheduler)
.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(scheduler);
this.skipForwardsCommand = ReactiveCommand
.CreateFromObservable(this.OnSkipForwards, canSkipForwards, scheduler)
.AddTo(this.disposables);
this.startCommand
.CanExecute
.Subscribe(x => this.IsStartVisible = x)
.AddTo(this.disposables);
this.pauseCommand
.CanExecute
.Subscribe(x => this.IsPauseVisible = x)
.AddTo(this.disposables);
this.resumeCommand
.CanExecute
.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.Stop())
.Subscribe()
.AddTo(this.disposables);
}
private ExerciseProgramViewModel ExerciseProgramViewModelFactory(ExerciseProgram model) =>
new ExerciseProgramViewModel(
this.loggerService.Value,
this.schedulerService.Value,
this.mainViewModel.Value,
model);
public ExerciseProgramsBuilder AddProgram(ExerciseProgram program)
{
this.programs.Add(program);
return this;
}
public ExerciseProgramViewModelBuilder WithModel(ExerciseProgram model) =>
this.With(ref this.model, model);
