private async Task <TaskCompletionSource <object> > PushRoute(Route route, bool cacheCurrentView,
bool ignoreCurrent, List <RouteEventError> errors)
{
route.Routes = this;
var currentRoute = Current;
if (currentRoute != null && !cacheCurrentView)
{
routeHead.CachedView = null;
}
if (!ignoreCurrent && currentRoute != null)
{
try
{
await currentRoute.OnRouteHiding();
}
catch (Exception ex)
{
RouteErrorListener.TryOnRouteEventException(currentRoute, RouteEventType.Hiding, ex);
}
}
try
{
await route.OnRouteInitializing();
}
catch (Exception ex)
{
errors.Add(new RouteEventError(RouteEventType.Initializing, ex));
RouteErrorListener.TryOnRouteEventException(route, RouteEventType.Initializing, ex);
}
try
{
await route.OnRouteActivating();
}
catch (Exception ex)
{
errors.Add(new RouteEventError(RouteEventType.Activating, ex));
RouteErrorListener.TryOnRouteEventException(route, RouteEventType.Activating, ex);
}
var item = new RouteItem(route);
try
{
var view = route.CreateView(false);
item.CachedView = view;
var frameworkElement = view as FrameworkElement;
if (frameworkElement != null && frameworkElement.DataContext == null)
{
frameworkElement.DataContext = route;
}
}
catch (Exception ex)
{
errors.Add(new RouteEventError(RouteEventType.ViewCreation, ex));
RouteErrorListener.TryOnRouteEventException(route, RouteEventType.ViewCreation, ex);
}
stack.Push(item);
RouteHead = item;
if (!ignoreCurrent && currentRoute != null)
{
try
{
await currentRoute.OnRouteHidden();
}
catch (Exception ex)
{
RouteErrorListener.TryOnRouteEventException(currentRoute, RouteEventType.Hidden, ex);
}
}
try
{
await route.OnRouteInitialized();
}
catch (Exception ex)
{
errors.Add(new RouteEventError(RouteEventType.Initialized, ex));
RouteErrorListener.TryOnRouteEventException(route, RouteEventType.Initialized, ex);
}
try
{
await route.OnRouteActivated();
}
catch (Exception ex)
{
errors.Add(new RouteEventError(RouteEventType.Activated, ex));
RouteErrorListener.TryOnRouteEventException(route, RouteEventType.Activated, ex);
}
return(item.CompletionSource);
}
private async Task ChangeRoute(Route route, List <TaskCompletionSource <object> > completionSources,
List <RouteEventError> errors)
{
var sentinel = 0;
while (true)
{
if (++sentinel == 32)
{
throw new RouteTransitionException("Detected possible loop with transient routes.");
}
var transientRoute = route as TransientRoute;
if (transientRoute != null)
{
transientRoute.Routes = this;
var transientRouteErrors = new List <RouteEventError>();
try
{
await transientRoute.OnRouteInitializing();
}
catch (Exception ex)
{
transientRouteErrors.Add(new RouteEventError(RouteEventType.Initializing, ex));
}
try
{
await transientRoute.OnRouteActivating();
}
catch (Exception ex)
{
transientRouteErrors.Add(new RouteEventError(RouteEventType.Activating, ex));
}
try
{
route = transientRoute.GetNextRoute(transientRouteErrors);
}
catch (Exception ex)
{
throw new RouteTransitionException(
"A transient route threw an exception while switching to next route.", ex);
}
if (route == null)
{
throw new RouteTransitionException("A transient route resulted in a dead end.");
}
if (route.Routes != null && route.Routes != this)
{
throw new RouteTransitionException(ErrorMessages.RoutesAssociatedWithOtherStack);
}
continue;
}
while (stack.Count != 0)
{
var item = stack.Pop();
completionSources.Add(item.CompletionSource);
try
{
await item.Route.OnRouteDeactivating(true);
}
catch (Exception ex)
{
RouteErrorListener.TryOnRouteEventException(item.Route, RouteEventType.Deactivating, ex);
}
item.CachedView = null;
try
{
await item.Route.OnRouteDeactivated(true);
}
catch (Exception ex)
{
RouteErrorListener.TryOnRouteEventException(item.Route, RouteEventType.Deactivated, ex);
}
}
await PushRoute(route, false, true, errors);
break;
}
}