public async Task It_produces_failed_notifications_for_RemoveEntry()
{
var sut = new BlindStackNavigator();
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(throwOnDispose: true)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM()));
var events = new List <StackNavigatorEventArgs>();
sut.StateChanged += Sut_StateChanged;
void Sut_StateChanged(object sender, StackNavigatorEventArgs args)
{
events.Add(args);
}
await Assert.ThrowsAsync <InvalidOperationException>(async() => await sut.RemoveEntries(CancellationToken.None, new int[] { 0 }));
sut.StateChanged -= Sut_StateChanged;
// There must be 2 notifications: 1 Processing when the remove starts and 1 FailedToProcess when it ends.
Assert.Equal(2, events.Count);
Assert.Equal(NavigatorRequestState.Processing, events[0].CurrentState.LastRequestState);
Assert.Equal(NavigatorRequestState.FailedToProcess, events[1].CurrentState.LastRequestState);
}
public async Task It_produces_2_notifications_for_Back()
{
var sut = new BlindStackNavigator();
// Add 2 items to be able to perform a back operation.
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM()));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM()));
var events = new List <StackNavigatorEventArgs>();
sut.StateChanged += Sut_StateChanged;
void Sut_StateChanged(object sender, StackNavigatorEventArgs args)
{
events.Add(args);
}
await sut.NavigateBack(CancellationToken.None);
sut.StateChanged -= Sut_StateChanged;
// There must be 2 notifications: 1 Processing when the back starts and 1 Processed when it ends.
Assert.Equal(2, events.Count);
Assert.Equal(NavigatorRequestState.Processing, events[0].CurrentState.LastRequestState);
Assert.Equal(NavigatorRequestState.Processed, events[1].CurrentState.LastRequestState);
}
public async Task It_removes_multiple_entries_and_navigate_back_correctly()
{
var sut = new BlindStackNavigator();
// Add 6 items to the stack.
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(0)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(2)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(3)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(4)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(5)));
var indexes = Enumerable.Range(2, 3);
// Remove the third, fourth and fifth items
await sut.RemoveEntries(CancellationToken.None, indexes);
// There must be 3 items left
Assert.Equal(3, sut.State.Stack.Count);
// Navigates back
await sut.NavigateBack(CancellationToken.None);
// The viewmodel count should be 2 and the current viewmodel id should be 1
Assert.Equal(2, sut.State.Stack.Count);
Assert.Equal(1, ((TestVM)sut.State.Stack.Last().ViewModel).Id);
}
public async Task Extended_interface_contract_changes_can_be_detected()
{
var ct = CancellationToken.None;
IStackNavigator navigator = new BlindStackNavigator();
// If the extension methods available in the abstraction package change their signatures, we get compilation errors here.
TestVM vmAfterNavigate = await navigator.Navigate(ct, () => new TestVM(), suppressTransition : false);
TestVM vmAfterNavigateAndClear = await navigator.NavigateAndClear(ct, () => new TestVM(), suppressTransition : false);
INavigableViewModel vm = navigator.GetActiveViewModel();
bool canGoBack = navigator.CanNavigateBack();
// Navigate twice so that RemovePrevious works.
await navigator.Navigate(ct, () => new TestVM(), suppressTransition : false);
await navigator.Navigate(ct, () => new TestVM(), suppressTransition : false);
await navigator.RemovePrevious(ct);
bool didNavigateBack = await navigator.TryNavigateBackTo <TestVM>(ct);
await navigator.ProcessRequest(ct, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), false, false));
IObservable <EventPattern <StackNavigatorEventArgs> > ob1 = navigator.ObserveStateChanged();
IObservable <StackNavigatorState> ob2 = navigator.ObserveCurrentState();
}
public async Task It_adds_entries_to_stack_when_it_navigates_forward()
{
var sut = new BlindStackNavigator();
var vm = await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM()));
Assert.NotNull(vm);
Assert.Single(sut.State.Stack);
}
public async Task It_removes_all_stack_entries_when_it_clears()
{
var sut = new BlindStackNavigator();
// Add an item to the stack.
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM()));
// Clear the stack.
await sut.Clear(CancellationToken.None);
// Stack must be empty.
Assert.Empty(sut.State.Stack);
}
public async Task It_disposes_VM_when_navigating_back()
{
var sut = new BlindStackNavigator();
// Add 2 items to the stack.
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(0)));
var vm = (TestVM)await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1)));
// Navigate back to remove the last item.
await sut.NavigateBack(CancellationToken.None);
// The removed entry must be disposed.
Assert.True(vm.IsDisposed);
}
public async Task It_disposes_VM_when_removing_entries()
{
var sut = new BlindStackNavigator();
// Add 2 items to the stack.
var vm = (TestVM)await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(0)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1)));
// Remove the first item.
await sut.RemoveEntries(CancellationToken.None, new int[] { 0 });
// The removed entry must be disposed.
Assert.True(vm.IsDisposed);
}
/// <summary>
/// Sets the active section using the provided section name and navigates.
/// </summary>
/// <typeparam name="TViewModel">The type of the view model.</typeparam>
/// <param name="sectionsNavigator">The sections navigator.</param>
/// <param name="ct">The cancellation token.</param>
/// <param name="sectionName">The name of the section to set as active.</param>
/// <param name="viewModelProvider">The method to make the view model instance. It will be invoked only if necessary.</param>
/// <param name="returnToRoot">When this is true, the navigator will navigate back to the view model matching the type <typeparamref name="TViewModel"/>.</param>
/// <returns>The stack navigator of the active section.</returns>
public static async Task <ISectionStackNavigator> SetActiveSection <TViewModel>(this ISectionsNavigator sectionsNavigator,
CancellationToken ct,
string sectionName,
Func <TViewModel> viewModelProvider,
bool returnToRoot = false)
where TViewModel : INavigableViewModel
{
if (ct.IsCancellationRequested)
{
typeof(SectionsNavigatorExtensions).Log().LogWarning($"Canceled 'SetActiveSection' operation to '{typeof(TViewModel).Name}' because of cancellation token.");
return(null);
}
// No cancellation beyond this point.
ct = CancellationToken.None;
var sectionNavigator = sectionsNavigator.State.Sections[sectionName];
if (sectionNavigator.State.Stack.LastOrDefault() == null)
{
// Create the default page if there's nothing in the section.
await sectionNavigator.Navigate(ct, StackNavigatorRequest.GetNavigateRequest(viewModelProvider, suppressTransition: true));
}
else if (returnToRoot && sectionNavigator.State.Stack.Last().ViewModel.GetType() != typeof(TViewModel))
{
if (sectionNavigator.State.Stack.Any(e => e.ViewModel.GetType() == typeof(TViewModel)))
{
// If the stack contains the root page of the section, remove all other entries and navigate back to it.
var indexesToRemove = sectionNavigator.State.Stack
.Select((entry, index) => (entry, index))
.Where(t => t.entry.ViewModel.GetType() != typeof(TViewModel) && t.index < sectionNavigator.State.Stack.Count - 1)
.Select(t => t.index)
.ToList();
await sectionNavigator.RemoveEntries(ct, indexesToRemove);
await sectionNavigator.NavigateBack(ct);
}
else
{
// If the section root page isn't in the stack, clear everything and navigate to it.
await sectionNavigator.Navigate(ct, StackNavigatorRequest.GetNavigateRequest(viewModelProvider, suppressTransition: true, clearBackStack: true));
}
}
return(await sectionsNavigator.SetActiveSection(ct, SectionsNavigatorRequest.GetSetActiveSectionRequest(sectionName)));
}
public async Task It_disposes_VMs_when_clearing()
{
var sut = new BlindStackNavigator();
// Add 2 items to the stack.
var vm0 = (TestVM)await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(0)));
var vm1 = (TestVM)await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1)));
// Clear to remove all items.
await sut.Clear(CancellationToken.None);
// All entries must be disposed.
Assert.True(vm0.IsDisposed);
Assert.True(vm1.IsDisposed);
}
public async Task It_removes_entries_correctly()
{
var sut = new BlindStackNavigator();
// Add 2 items to the stack.
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(0)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1)));
// Remove the first item
await sut.RemoveEntries(CancellationToken.None, new int[] { 0 });
// There must be only 1 item left in the stack because we just removed one.
Assert.Single(sut.State.Stack);
// The remaining item must be the second navigation.
Assert.Equal(1, ((TestVM)sut.State.Stack.Last().ViewModel).Id);
}
public async Task Interface_contract_changes_can_be_detected()
{
var ct = CancellationToken.None;
IStackNavigator navigator = new BlindStackNavigator();
// If the core contract changes, we get compilation errors here.
INavigableViewModel vmAfterNavigate = await navigator.Navigate(ct, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), false, false));
INavigableViewModel vmAfterBack = await navigator.NavigateBack(ct);
await navigator.Clear(ct);
// Navigate twice so that RemoveEntries works.
await navigator.Navigate(ct, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), false, false));
await navigator.Navigate(ct, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), false, false));
await navigator.RemoveEntries(ct, new int[] { 0 }.AsEnumerable());
}
public async Task It_fails_to_navigate_back_when_there_arent_enough_entries()
{
var sut = new BlindStackNavigator();
// Add 1 item to the stack.
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM()));
var stackBeforeNavigateBack = sut.State.Stack;
// Navigating back must 'fail' if there is only 1 entry.
// There is no exception, but the result vm must be null.
var vm = await sut.NavigateBack(CancellationToken.None);
Assert.Null(vm);
var stackAfterNavigateBack = sut.State.Stack;
// Because the back didn't do anything, the stack must not change.
Assert.Equal(stackAfterNavigateBack, stackBeforeNavigateBack);
}
public async Task It_produces_2_notifications_when_a_section_navigates()
{
var sut = new BlindSectionsNavigator("defaultSection1", "defaultSection2");
var eventList = new List <(object sender, SectionsNavigatorEventArgs args)>();
var section = await sut.SetActiveSection(CancellationToken.None, SectionsNavigatorRequest.GetSetActiveSectionRequest("defaultSection1"));
sut.StateChanged += OnStateChanged;
void OnStateChanged(object sender, SectionsNavigatorEventArgs args)
{
eventList.Add((sender, args));
}
await section.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1), suppressTransition: true));
Assert.Equal(2, eventList.Count);
Assert.Equal(NavigatorRequestState.Processing, eventList[0].args.CurrentState.LastRequestState);
Assert.Equal(SectionsNavigatorRequestType.ReportSectionStateChanged, eventList[0].args.CurrentState.LastRequest.RequestType);
Assert.Equal(NavigatorRequestState.Processed, eventList[1].args.CurrentState.LastRequestState);
Assert.Equal(SectionsNavigatorRequestType.ReportSectionStateChanged, eventList[1].args.CurrentState.LastRequest.RequestType);
}
public async Task It_navigates_back()
{
var sut = new BlindStackNavigator();
// Add 2 items to the stack.
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(0)));
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1)));
// The last entry must match the last navigation.
Assert.Equal(1, ((TestVM)sut.State.Stack.Last().ViewModel).Id);
var vmFromNavigation = await sut.NavigateBack(CancellationToken.None);
var vmFromStack = (TestVM)sut.State.Stack.Last().ViewModel;
// The ViewModels from the navigation and stack must be the same.
Assert.Equal(vmFromStack, vmFromNavigation);
// The final ViewModel must be the first one we navigated to.
Assert.Equal(0, vmFromStack.Id);
}
/// <summary>
/// Opens a new modal.
/// </summary>
/// <typeparam name="TViewModel">The type of the view model.</typeparam>
/// <param name="sectionsNavigator">The sections navigator.</param>
/// <param name="ct"></param>
/// <param name="viewModelProvider">The method invoked to instanciate the new ViewModel.</param>
/// <param name="priority">The modal's priority.</param>
/// <param name="name">The modal's name.</param>
/// <returns>The newly created ViewModel instance.</returns>
public static async Task <TViewModel> OpenModal <TViewModel>(this ISectionsNavigator sectionsNavigator, CancellationToken ct, Func <TViewModel> viewModelProvider, int?priority = null, string name = null)
where TViewModel : INavigableViewModel
{
var modalNavigator = await sectionsNavigator.OpenModal(ct, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(viewModelProvider, suppressTransition: true), name, priority));
// Note that modalNavigator can be null if the OpenModal gets cancelled.
return((TViewModel)modalNavigator?.GetActiveViewModel());
}
public async Task It_orders_modals()
{
var sut = new BlindSectionsNavigator();
var modalNavigator3 = await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(3), suppressTransition: true), modalPriority: 3));
var modalNavigator1 = await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1), suppressTransition: true), modalPriority: 1));
Assert.Equal(sut.State.Modals[0], modalNavigator1);
Assert.Equal(sut.State.Modals[1], modalNavigator3);
var modalNavigator2 = await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(2), suppressTransition: true), modalPriority: 2));
Assert.Equal(sut.State.Modals[0], modalNavigator1);
Assert.Equal(sut.State.Modals[1], modalNavigator2);
Assert.Equal(sut.State.Modals[2], modalNavigator3);
}
public async Task It_disposes_modal_VM_when_closing_modals()
{
var sut = new BlindSectionsNavigator();
var modalNavigator = await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1), suppressTransition: true)));
var vm = (TestVM)modalNavigator.State.Stack.Last().ViewModel;
await sut.CloseModal(CancellationToken.None, SectionsNavigatorRequest.GetCloseModalRequest(null));
Assert.True(vm.IsDisposed);
}
public async Task It_stacks_modals_navigators()
{
var sut = new BlindSectionsNavigator();
var modalNavigator = await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1), suppressTransition: true)));
Assert.NotNull(modalNavigator);
Assert.Equal(1, modalNavigator.Priority);
Assert.Single(modalNavigator.State.Stack);
Assert.Single(sut.State.Modals);
Assert.NotNull(sut.State.ActiveModal);
Assert.Equal(modalNavigator, sut.State.ActiveModal);
Assert.Equal(modalNavigator, sut.State.Modals[0]);
var modalNavigator2 = await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(2), suppressTransition: true)));
Assert.NotNull(modalNavigator2);
Assert.Equal(2, modalNavigator2.Priority);
Assert.Single(modalNavigator2.State.Stack);
Assert.Equal(2, sut.State.Modals.Count);
Assert.NotNull(sut.State.ActiveModal);
Assert.Equal(modalNavigator2, sut.State.ActiveModal);
Assert.Equal(modalNavigator, sut.State.Modals[0]);
Assert.Equal(modalNavigator2, sut.State.Modals[1]);
}
public async Task It_produces_failed_notifications_for_CloseModal()
{
var sut = new BlindSectionsNavigator();
var eventList = new List <(object sender, SectionsNavigatorEventArgs args)>();
var modalNavigator = await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1, throwOnDispose: true), suppressTransition: true)));
sut.StateChanged += OnStateChanged;
void OnStateChanged(object sender, SectionsNavigatorEventArgs args)
{
eventList.Add((sender, args));
}
await Assert.ThrowsAsync <InvalidOperationException>(async() => await sut.CloseModal(CancellationToken.None, SectionsNavigatorRequest.GetCloseModalRequest(null)));
sut.StateChanged -= OnStateChanged;
Assert.Null(sut.State.ActiveSection);
Assert.Equal(2, eventList.Count);
Assert.Equal(NavigatorRequestState.Processing, eventList[0].args.CurrentState.LastRequestState);
Assert.Equal(NavigatorRequestState.FailedToProcess, eventList[1].args.CurrentState.LastRequestState);
}
public async Task It_produces_2_notifications_for_OpenModal()
{
var sut = new BlindSectionsNavigator();
var eventList = new List <(object sender, SectionsNavigatorEventArgs args)>();
sut.StateChanged += OnStateChanged;
void OnStateChanged(object sender, SectionsNavigatorEventArgs args)
{
eventList.Add((sender, args));
}
var modalNavigator = await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1), suppressTransition: true)));
sut.StateChanged -= OnStateChanged;
Assert.Equal(2, eventList.Count);
Assert.Equal(NavigatorRequestState.Processing, eventList[0].args.CurrentState.LastRequestState);
Assert.Equal(SectionsNavigatorRequestType.OpenModal, eventList[0].args.CurrentState.LastRequest.RequestType);
Assert.Equal(NavigatorRequestState.Processed, eventList[1].args.CurrentState.LastRequestState);
Assert.Equal(SectionsNavigatorRequestType.OpenModal, eventList[1].args.CurrentState.LastRequest.RequestType);
}
public async Task It_fails_to_open_2_modals_with_same_priority()
{
var sut = new BlindSectionsNavigator();
await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), suppressTransition: true), modalPriority: 1));
await Assert.ThrowsAsync <ArgumentException>(async() =>
{
await sut.OpenModal(CancellationToken.None, SectionsNavigatorRequest.GetOpenModalRequest(StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), suppressTransition: true), modalPriority: 1));
});
}