private IObservable <Unit> WhenLinked()
{
return(Observable
.Defer(
() =>
{
return Observable
.Start(() => ViewStackService.InsertPage(1, new RewardsViewModel()), RxApp.MainThreadScheduler)
.Concat(ViewStackService.PopToPage(1));
}));
}
public void Should_HavePageIndexPlusOnePagesRemaining_When_PopToPageIsInvoked(int pageIndex)
{
// Arrange
var sut = new ViewStackService(_viewShell, new[] { _page, _page, _page, _page });
// Act
sut.PopToPage(pageIndex).Subscribe();
// Assert
int numPages = pageIndex + 1;
sut.PageStack.FirstAsync().Wait().Count.Should().Be(numPages);
}
public HomeViewModel(IViewStackService viewStackService)
: base(viewStackService)
{
PushPage = ReactiveCommand.CreateFromObservable(
() =>
{
return(ViewStackService.PushPage(new HomeViewModel(ViewStackService)));
});
PushModalWithNav = ReactiveCommand.CreateFromObservable(
() =>
{
return(ViewStackService.PushModal(new NavigationPageViewModel(new HomeViewModel(ViewStackService))));
});
PushModalWithoutNav = ReactiveCommand.CreateFromObservable(
() =>
{
return(ViewStackService.PushModal(new HomeViewModel(ViewStackService)));
});
PopModal = ReactiveCommand.CreateFromObservable(
() =>
{
return(ViewStackService.PopModal());
});
var canPop = this.WhenAnyValue(
vm => vm.PopCount,
vm => vm.PageCount,
(popCount, pageCount) => popCount > 0 && popCount < pageCount);
PopPages = ReactiveCommand.CreateFromObservable(
() =>
{
return(ViewStackService
.PopPages(_popCount ?? 0, true));
},
canPop);
var canPopToNewPage = this.WhenAnyValue(
vm => vm.PageIndex,
pageIndex => pageIndex >= 0 && pageIndex < PageCount);
PopToNewPage = ReactiveCommand.CreateFromObservable(
() =>
{
return(Observable
.Start(() => ViewStackService.InsertPage(PageIndex ?? 0, new LoginViewModel(ViewStackService)), RxApp.MainThreadScheduler)
.SelectMany(_ => ViewStackService.PopToPage(PageIndex ?? 0)));
},
canPopToNewPage);
this.WhenActivated(
disposables =>
{
_pageCount = ViewStackService
.PageStack
.Select(
x =>
{
return(x != null ? x.Count : 0);
})
.ToProperty(this, vm => vm.PageCount, default(int), false, RxApp.MainThreadScheduler)
.DisposeWith(disposables);
});
}