// *** Protected Methods ***
protected void OnFlyoutClosed(object sender, object e)
{
// Remove all navigation entries from the stack
// TODO : Add some way to indicate to VMs that they are closing - IClosingAware?
NavigationStack.Clear();
}
public void Clear_TwoPagesNavigatedThenClear_CurrentPageIsNull()
{
NavigationStack navigationStack = new NavigationStack();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
navigationStack.NavigateTo(new PageInfo("Page 2", null));
navigationStack.Clear();
Assert.Equal(null, navigationStack.CurrentPage);
}
public void Clear_TwoPagesNavigatedThenClear_CountIsZero()
{
NavigationStack navigationStack = new NavigationStack();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
navigationStack.NavigateTo(new PageInfo("Page 2", null));
navigationStack.Clear();
Assert.Equal(0, navigationStack.Count);
}
protected void OnSettingsFlyoutUnloaded(object sender, object e)
{
// Raise the FlyoutClosed event
OnFlyoutClosed();
// Remove all navigation entries from the stack
// NB: Set the 'isUnloading' flag to stop reopening the system settings pane
// TODO : Add some way to indicate to VMs that they are closing - IClosingAware?
_isUnloading = true;
NavigationStack.Clear();
_isUnloading = false;
}
// *** Methods ***
public void Clear()
{
_navigationStack.Clear();
}
public void PropertyChanged_CanGoBack_IsNotCalledWhenEmptyNavigationStackIsCleared()
{
NavigationStack navigationStack = new NavigationStack();
int changedCount = 0;
navigationStack.PropertyChanged += delegate (object sender, PropertyChangedEventArgs e) { if (e.PropertyName == "CanGoBack") changedCount++; };
navigationStack.Clear();
Assert.Equal(0, changedCount);
}
public void PropertyChanged_CanGoBack_IsCalledWhenNavigationStackIsCleared()
{
NavigationStack navigationStack = new NavigationStack();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
int changedCount = 0;
navigationStack.PropertyChanged += delegate (object sender, PropertyChangedEventArgs e) { if (e.PropertyName == "CanGoBack") changedCount++; };
navigationStack.Clear();
Assert.Equal(1, changedCount);
}
public void NavigatingFrom_IsCalledWhenNavigationStackIsCleared()
{
NavigationStack navigationStack = new NavigationStack();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
navigationStack.NavigateTo(new PageInfo("Page 2", null));
List<PageNavigationEventArgs> navigationEvents = new List<PageNavigationEventArgs>();
navigationStack.NavigatingFrom += delegate (object sender, PageNavigationEventArgs e) { navigationEvents.Add(e); };
navigationStack.Clear();
Assert.Equal(1, navigationEvents.Count);
PageNavigationEventArgs navigationEvent = navigationEvents[0];
Assert.Equal(PageNavigationMode.Back, navigationEvent.NavigationMode);
Assert.Equal("Page 2", navigationEvent.Page.PageName);
}
public void CollectionChanged_IsCalledWhenNavigationStackIsCleared()
{
NavigationStack navigationStack = new NavigationStack();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
navigationStack.NavigateTo(new PageInfo("Page 2", null));
List<NotifyCollectionChangedEventArgs> changeEvents = new List<NotifyCollectionChangedEventArgs>();
navigationStack.CollectionChanged += delegate (object sender, NotifyCollectionChangedEventArgs e) { changeEvents.Add(e); };
navigationStack.Clear();
Assert.Equal(1, changeEvents.Count);
NotifyCollectionChangedEventArgs changeEvent = changeEvents[0];
Assert.Equal(NotifyCollectionChangedAction.Reset, changeEvent.Action);
}
