public void HandleNavigated(ShellNavigatedEventArgs args) { if (AccumulateNavigatedEvents) { if (_accumulatedEvent == null) { _accumulatedEvent = args; } } else { _accumulatedEvent = null; BaseShellItem baseShellItem = _shell.CurrentItem?.CurrentItem?.CurrentItem; if (baseShellItem != null) { baseShellItem.OnAppearing(() => { FireNavigatedEvents(args, _shell); }); } else { FireNavigatedEvents(args, _shell); } void FireNavigatedEvents(ShellNavigatedEventArgs a, Shell shell) { Navigated?.Invoke(this, args); // reset active page route tree Routing.ClearImplicitPageRoutes(); Routing.RegisterImplicitPageRoutes(_shell); } } }
internal async Task GoToAsync( ShellNavigationParameters shellNavigationParameters, ShellNavigationRequest navigationRequest) { // check for any pending navigations that need to complete if (_shell?.CurrentItem?.CurrentItem?.PendingNavigationTask != null) { await(_shell?.CurrentItem?.CurrentItem?.PendingNavigationTask ?? Task.CompletedTask); } if (shellNavigationParameters.PagePushing != null && navigationRequest == null) { Routing.RegisterImplicitPageRoute(shellNavigationParameters.PagePushing); } var state = shellNavigationParameters.TargetState ?? new ShellNavigationState(Routing.GetRoute(shellNavigationParameters.PagePushing), false); bool?animate = shellNavigationParameters.Animated; bool enableRelativeShellRoutes = shellNavigationParameters.EnableRelativeShellRoutes; ShellNavigatingEventArgs deferredArgs = shellNavigationParameters.DeferredArgs; navigationRequest ??= ShellUriHandler.GetNavigationRequest(_shell, state.FullLocation, enableRelativeShellRoutes, shellNavigationParameters: shellNavigationParameters); bool isRelativePopping = ShellUriHandler.IsTargetRelativePop(shellNavigationParameters); var parameters = shellNavigationParameters.Parameters ?? new ShellRouteParameters(); ShellNavigationSource source = CalculateNavigationSource(_shell, _shell.CurrentState, navigationRequest); // If the deferredArgs are non null that means we are processing a delayed navigation // so the user has indicated they want to go forward with navigation // This scenario only comes up from UI iniated navigation (i.e. switching tabs) if (deferredArgs == null) { var navigatingArgs = ProposeNavigation(source, state, _shell.CurrentState != null, animate ?? true); if (navigatingArgs != null) { bool accept = !navigatingArgs.NavigationDelayedOrCancelled; if (navigatingArgs.DeferredTask != null) { accept = await navigatingArgs.DeferredTask; } if (!accept) { return; } } } Routing.RegisterImplicitPageRoutes(_shell); _accumulateNavigatedEvents = true; var uri = navigationRequest.Request.FullUri; var queryString = navigationRequest.Query; var queryData = ParseQueryString(queryString); parameters.Merge(queryData); ApplyQueryAttributes(_shell, parameters, false, false); var shellItem = navigationRequest.Request.Item; var shellSection = navigationRequest.Request.Section; var currentShellSection = _shell.CurrentItem?.CurrentItem; var nextActiveSection = shellSection ?? shellItem?.CurrentItem; ShellContent shellContent = navigationRequest.Request.Content; bool modalStackPreBuilt = false; // check for any pending navigations that need to complete if (currentShellSection?.PendingNavigationTask != null) { await(currentShellSection?.PendingNavigationTask ?? Task.CompletedTask); } // If we're replacing the whole stack and there are global routes then build the navigation stack before setting the shell section visible if (navigationRequest.Request.GlobalRoutes.Count > 0 && nextActiveSection != null && navigationRequest.StackRequest == ShellNavigationRequest.WhatToDoWithTheStack.ReplaceIt) { modalStackPreBuilt = true; bool?isAnimated = (nextActiveSection != currentShellSection) ? false : animate; await nextActiveSection.GoToAsync(navigationRequest, parameters, _shell.FindMauiContext()?.Services, isAnimated, isRelativePopping); } if (shellItem != null) { ApplyQueryAttributes(shellItem, parameters, navigationRequest.Request.Section == null, false); bool navigatedToNewShellElement = false; if (shellSection != null && shellContent != null) { ApplyQueryAttributes(shellContent, parameters, navigationRequest.Request.GlobalRoutes.Count == 0, isRelativePopping); if (shellSection.CurrentItem != shellContent) { shellSection.SetValueFromRenderer(ShellSection.CurrentItemProperty, shellContent); navigatedToNewShellElement = true; } } if (shellSection != null) { ApplyQueryAttributes(shellSection, parameters, navigationRequest.Request.Content == null, false); if (shellItem.CurrentItem != shellSection) { shellItem.SetValueFromRenderer(ShellItem.CurrentItemProperty, shellSection); navigatedToNewShellElement = true; } } if (_shell.CurrentItem != shellItem) { _shell.SetValueFromRenderer(Shell.CurrentItemProperty, shellItem); navigatedToNewShellElement = true; } // Setting the current item isn't an async operation but it triggers an async // navigation path. So this waits until that's finished before returning from GotoAsync if (_shell?.CurrentItem?.CurrentItem?.PendingNavigationTask != null) { await(_shell?.CurrentItem?.CurrentItem?.PendingNavigationTask ?? Task.CompletedTask); } if (!modalStackPreBuilt && currentShellSection?.Navigation.ModalStack.Count > 0) { // - navigating to new shell element so just pop everything // - or route contains no global route requests if (navigatedToNewShellElement || navigationRequest.Request.GlobalRoutes.Count == 0) { // remove all non visible pages first so the transition just smoothly goes from // currently visible modal to base page if (navigationRequest.Request.GlobalRoutes.Count == 0) { for (int i = currentShellSection.Stack.Count - 1; i >= 1; i--) { currentShellSection.Navigation.RemovePage(currentShellSection.Stack[i]); } } await currentShellSection.PopModalStackToPage(null, animate); } } if (navigationRequest.Request.GlobalRoutes.Count > 0 && navigationRequest.StackRequest != ShellNavigationRequest.WhatToDoWithTheStack.ReplaceIt) { // TODO get rid of this hack and fix so if there's a stack the current page doesn't display await _shell.Dispatcher.DispatchAsync(() => { return(_shell.CurrentItem.CurrentItem.GoToAsync(navigationRequest, parameters, _shell.FindMauiContext()?.Services, animate, isRelativePopping)); }); } else if (navigationRequest.Request.GlobalRoutes.Count == 0 && navigationRequest.StackRequest == ShellNavigationRequest.WhatToDoWithTheStack.ReplaceIt && nextActiveSection?.Navigation?.NavigationStack?.Count > 1) { // TODO get rid of this hack and fix so if there's a stack the current page doesn't display await _shell.Dispatcher.DispatchAsync(() => { return(_shell.CurrentItem.CurrentItem.GoToAsync(navigationRequest, parameters, _shell.FindMauiContext()?.Services, animate, isRelativePopping)); }); } } else { await _shell.CurrentItem.CurrentItem.GoToAsync(navigationRequest, parameters, _shell.FindMauiContext()?.Services, animate, isRelativePopping); } // Setting the current item isn't an async operation but it triggers an async // navigation path. So this waits until that's finished before returning from GotoAsync if (_shell?.CurrentItem?.CurrentItem?.PendingNavigationTask != null) { await(_shell?.CurrentItem?.CurrentItem?.PendingNavigationTask ?? Task.CompletedTask); } (_shell as IShellController).UpdateCurrentState(source); _accumulateNavigatedEvents = false; // this can be null in the event that no navigation actually took place! if (_accumulatedEvent != null) { HandleNavigated(_accumulatedEvent); } }
public void HandleNavigated(ShellNavigatedEventArgs args) { _waitingForWindow?.Dispose(); _waitingForWindow = null; // we don't want to fire Navigated until shell is attached to an actual window if (_shell.Window == null || _shell.CurrentPage == null) { _shell.PropertyChanged += WaitForWindowToSet; var shellContent = _shell?.CurrentItem?.CurrentItem?.CurrentItem; if (shellContent != null) { shellContent.ChildAdded += WaitForWindowToSet; } _waitingForWindow = new ActionDisposable(() => { _shell.PropertyChanged -= WaitForWindowToSet; if (shellContent != null) { shellContent.ChildAdded -= WaitForWindowToSet; } }); void WaitForWindowToSet(object sender, EventArgs e) { if (_shell.Window != null && _shell.CurrentPage != null) { _waitingForWindow?.Dispose(); _waitingForWindow = null; _shell.CurrentItem?.SendAppearing(); HandleNavigated(args); } } return; } if (AccumulateNavigatedEvents) { if (_accumulatedEvent == null) { _accumulatedEvent = args; } } else { _accumulatedEvent = null; BaseShellItem baseShellItem = _shell.CurrentItem?.CurrentItem?.CurrentItem; if (baseShellItem != null) { baseShellItem.OnAppearing(() => { FireNavigatedEvents(args, _shell); }); } else { FireNavigatedEvents(args, _shell); } void FireNavigatedEvents(ShellNavigatedEventArgs a, Shell shell) { Navigated?.Invoke(this, args); // reset active page route tree Routing.ClearImplicitPageRoutes(); Routing.RegisterImplicitPageRoutes(_shell); } } }