public virtual void UpdateRootPage(NavigationPage page)
{
if (_rootPage != null)
{
_rootPage.Pushed -= OnPushed;
_rootPage.Popped -= OnPopped;
_rootPage.PoppedToRoot -= OnPopped;
}
if (page != null)
{
page.Pushed += OnPushed;
page.Popped += OnPopped;
page.PoppedToRoot += OnPopped;
}
_rootPage = page;
var currentPage = CurrentContent as Page ?? page;
if (currentPage != null)
{
var context = currentPage.DataContext();
if (context != null)
{
currentPage.SetNavigationParameter(NavigationProvider.GenerateNavigationParameter(context.GetType(), string.Empty));
}
_threadManager.Invoke(ExecutionMode.AsynchronousOnUiThread, this, currentPage,
(service, p) => service.RaiseNavigated(p, p.GetNavigationParameter() as string, NavigationMode.New),
OperationPriority.Low);
}
}
protected virtual void InitializeRootPage(IViewModel viewModel, IDataContext context)
{
var mainPage = (Page)ViewManager.GetOrCreateView(viewModel, true, context);
var navigationPage = mainPage as NavigationPage;
if (WrapToNavigationPage)
{
navigationPage = CreateNavigationPage(mainPage);
}
var isRoot = navigationPage == null || ReferenceEquals(mainPage, navigationPage);
if (navigationPage != null)
{
INavigationService navigationService;
if (!ServiceProvider.TryGet(out navigationService))
{
navigationService = CreateNavigationService();
ServiceProvider.IocContainer.BindToConstant(navigationService);
}
//Activating navigation provider if need
INavigationProvider provider;
ServiceProvider.TryGet(out provider);
navigationService.UpdateRootPage(navigationPage, viewModel);
mainPage = navigationPage;
}
Application.Current.MainPage = mainPage;
EventHandler <Page, CancelEventArgs> handler = OnBackButtonPressed;
XamarinFormsToolkitExtensions.BackButtonPressed -= handler;
var mode = NavigationMode.New;
if (isRoot)
{
XamarinFormsToolkitExtensions.BackButtonPressed += handler;
if (viewModel.Settings.State.Contains(IsRootConstant))
{
mode = NavigationMode.Refresh;
}
else
{
viewModel.Settings.State.AddOrUpdate(IsRootConstant, null);
}
viewModel.Settings.Metadata.AddOrUpdate(ViewModelConstants.CanCloseHandler, CanCloseRootViewModel);
NavigationDispatcher.OnNavigated(new NavigationContext(NavigationType.Page, mode, null, viewModel, this, context));
}
else
{
mainPage.SetNavigationParameter(NavigationProvider.GenerateNavigationParameter(viewModel));
ServiceProvider.Get <INavigationProvider>().Restore(context);
}
}
protected virtual void InitializeRootPage(IViewModel viewModel, IDataContext context)
{
var mainPage = (Page)ServiceProvider.ViewManager.GetOrCreateView(viewModel, true, context);
mainPage.SetNavigationParameter(NavigationProvider.GenerateNavigationParameter(viewModel));
NavigationPage navigationPage = mainPage as NavigationPage;
if (WrapToNavigationPage)
{
navigationPage = CreateNavigationPage(mainPage);
}
bool isRoot = ReferenceEquals(mainPage, navigationPage);
if (navigationPage != null)
{
INavigationService navigationService;
if (!IocContainer.TryGet(out navigationService))
{
navigationService = CreateNavigationService();
IocContainer.BindToConstant(navigationService);
}
//Activating navigation provider if need
INavigationProvider provider;
IocContainer.TryGet(out provider);
navigationService.UpdateRootPage(navigationPage, viewModel);
mainPage = navigationPage;
}
Application.Current.MainPage = mainPage;
NavigationMode mode = NavigationMode.New;
if (isRoot)
{
if (viewModel.Settings.State.Contains(IsRootConstant))
{
mode = NavigationMode.Refresh;
}
viewModel.Settings.State.AddOrUpdate(IsRootConstant, null);
}
IocContainer.Get <INavigationDispatcher>().OnNavigated(new NavigationContext(NavigationType.Page, mode, null, viewModel, this, context));
}
public virtual void OnNewIntent(Intent intent, Action <Intent> baseOnNewIntent)
{
baseOnNewIntent(intent);
//note android doesn't support reorder activity by instance it will reorder it using type, we need to manually change view model if need
var oldViewModel = DataContext as IViewModel;
Guid id;
if (oldViewModel != null && Guid.TryParse(intent.GetStringExtra(IntentViewModelIdKey), out id))
{
var newViewModel = ServiceProvider.ViewModelProvider.TryGetViewModelById(id);
if (newViewModel != null && !ReferenceEquals(newViewModel, oldViewModel))
{
var navigationDispatcher = ServiceProvider.Get <INavigationDispatcher>();
var openedViewModels = navigationDispatcher.GetOpenedViewModels(NavigationType.Page).ToList();
var viewModels = openedViewModels
.Select(info => info.ViewModel)
.Where(vm => vm.GetCurrentView <object>()?.GetType() == Target.GetType())
.ToList();
var from = viewModels.IndexOf(newViewModel);
var to = viewModels.IndexOf(oldViewModel);
if (from < 0 || to < 0)
{
return;
}
for (int i = to; i > from; i--)
{
var viewModel = viewModels[i];
var currentView = viewModels[i - 1].GetCurrentView <object>();
if (currentView != null)
{
ServiceProvider.ViewManager.InitializeViewAsync(viewModel, currentView);
var activity = currentView as Activity;
if (activity != null)
{
var newIntent = new Intent(activity.Intent);
newIntent.PutExtra(NavigationService.IntentParameterKey, NavigationProvider.GenerateNavigationParameter(viewModel));
activity.Intent = newIntent;
}
}
}
var newParameter = intent.GetStringExtra(NavigationService.IntentParameterKey);
var oldParameter = Target.Intent.GetStringExtra(NavigationService.IntentParameterKey);
if (newParameter != null && !string.Equals(newParameter, oldParameter))
{
var newIntent = new Intent(Target.Intent);
newIntent.PutExtra(NavigationService.IntentParameterKey, newParameter);
Target.Intent = newIntent;
}
ServiceProvider.ViewManager.InitializeViewAsync(newViewModel, Target);
int freeIndex = -1;
for (int i = 0; i < openedViewModels.Count; i++)
{
var viewModelInfo = openedViewModels[i];
if (freeIndex == -1 && ReferenceEquals(viewModelInfo.ViewModel, newViewModel))
{
++i;
freeIndex = i;
openedViewModels.Insert(i, null);
continue;
}
if (freeIndex != -1 && viewModelInfo.ViewModel.GetCurrentView <object>()?.GetType() == Target.GetType())
{
openedViewModels[freeIndex] = viewModelInfo;
openedViewModels[i] = null;
freeIndex = i;
}
}
if (freeIndex != -1)
{
openedViewModels.RemoveAt(freeIndex);
navigationDispatcher.UpdateOpenedViewModels(NavigationType.Page, openedViewModels);
}
}
}
}