コード例 #1
0
        void NavigationPopCallback(MessageBus bus, NavigationPopInfo navigationPopInfo)
        {
            if (navigationPopInfo == null)
            {
                throw new ArgumentNullException(nameof(navigationPopInfo));
            }

            if (!navigationPopInfo.Force && _isBusy)
            {
                return;
            }

            if (_app == null)
            {
                throw new FieldAccessException(@"Application property not set. Use Init() before navigation");
            }
            if (_navigations.Count == 0)
            {
                throw new FieldAccessException(@"Navigation is null. Add NavigationPage first");
            }

            Device.BeginInvokeOnMainThread(async() => {
                _isBusy = true;

                try {
                    await Pop(navigationPopInfo);
                }
                catch (Exception) {
                    // ignore
                }

                _isBusy = false;
            });
        }
コード例 #2
0
        async Task Pop(NavigationPopInfo popInfo)
        {
            INavigation navigation;

            switch (popInfo.Mode)
            {
            case NavigationMode.Normal:
                if (_navigations.TryPeek(out navigation))
                {
                    await NormalPop(popInfo.WithAnimation, navigation);
                }
                break;

            case NavigationMode.Modal:
                if (_navigations.TryPop(out navigation) && navigation.ModalStack.Count > 0)
                {
                    await ModalPop(popInfo.WithAnimation, navigation);
                }
                break;

            case NavigationMode.Root:
                if (_navigations.TryPeek(out navigation))
                {
                    var pagesToDispose = navigation.NavigationStack?.Count > 0
                                                        ? navigation.NavigationStack.Where(p => p != navigation.NavigationStack[0]).ToArray()
                                                        : null;
                    await navigation.PopToRootAsync(popInfo.WithAnimation);

                    DisposePages(pagesToDispose);
                }
                break;

            case NavigationMode.Custom:
                await HandleCustomPopNavigation(popInfo);

                break;

            default:
                throw new NotImplementedException();
            }
        }
コード例 #3
0
 Task HandleCustomPopNavigation(NavigationPopInfo popInfo)
 {
     // TODO: Implement your own navigation stack manipulation using popInfo
     return(Task.FromResult(0));
 }