public void NavigateWithTransitions()
{
var navigator = new FrameNavigationServiceWrapper(Frame.Dispatcher, Frame);
navigator.NavigateDirectToContent(new Button());
Assert.IsNull(TransitionSelector.CurrentTransition);
ProcessEventsSlow();
navigator.NavigateDirectToContent(new Button(), "ZoomIn");
Assert.AreEqual(TransitionSelector.CurrentTransition.Name, "ZoomIn");
ProcessEventsSlow();
navigator.NavigateDirectToContent(new Button(), "Forward");
Assert.AreEqual(TransitionSelector.CurrentTransition.Name, "Forward");
ProcessEventsSlow();
navigator.GoBack();
Assert.AreEqual(TransitionSelector.CurrentTransition.Name, "Back");
ProcessEventsSlow();
navigator.GoForward();
Assert.AreEqual(TransitionSelector.CurrentTransition.Name, "Forward");
ProcessEventsSlow();
navigator.GoBack();
Assert.AreEqual(TransitionSelector.CurrentTransition.Name, "Back");
ProcessEventsSlow();
navigator.GoBack();
Assert.AreEqual(TransitionSelector.CurrentTransition.Name, "ZoomOut");
ProcessEventsSlow();
}
/// <summary>
/// Creates an <see cref="INavigator"/> bound to the navigation service that owns a given source
/// element. This method can be called multiple times for the same <paramref name="sourceElement"/>.
/// </summary>
/// <param name="sourceElement">A UI element that lives inside the frame that you want a navigator
/// for.</param>
/// <returns>
/// An instance of the <see cref="INavigator"/> interface which can be used for navigation.
/// </returns>
public INavigator GetOwningNavigator(UIElement sourceElement)
{
Guard.ArgumentNotNull(sourceElement, "sourceElement");
var existingNavigator = NavigationProperties.GetNavigator(sourceElement);
if (existingNavigator != null)
{
return existingNavigator;
}
Func<INavigationService> lazyFrameGetter = () =>
{
var frame = null as Frame;
DependencyObject parent = sourceElement;
while (parent != null)
{
frame = parent as Frame;
if (frame != null)
break;
parent = VisualTreeHelper.GetParent(parent);
}
if (frame == null)
{
throw new ImpossibleNavigationRequestException("The Navigator for this UI element is not avaialable. Please ensure the current view has been loaded into a frame, or that the NavigationProperties.Navigator attached property has been set.");
}
var wrapper = new FrameNavigationServiceWrapper(sourceElement.Dispatcher, frame);
return wrapper;
};
return NewNavigator(lazyFrameGetter, null);
}
