C# ViewModels.ItemListViewModel类代码示例

        public FolderPage(BaseItemDto parent, DisplayPreferences displayPreferences, IApiClient apiClient, IImageManager imageManager, IPresentationManager presentation, INavigationService navigationManager, IPlaybackManager playbackManager, ILogger logger, ListPageConfig options)
        {
            _logger = logger;
            _presentationManager = presentation;
            _imageManager = imageManager;
            _apiClient = apiClient;
            _options = options;

            _parentItem = parent;

            InitializeComponent();

            Loaded += FolderPage_Loaded;

            SetDefaults(displayPreferences);

            var playAllFromHere = parent.IsType("playlist") || parent.IsType("musicalbum");

            _viewModel = new ItemListViewModel(vm => options.CustomItemQuery(vm, displayPreferences), _presentationManager, _imageManager, _apiClient, navigationManager, playbackManager, _logger)
            {
                ImageDisplayHeightGenerator = GetImageDisplayHeight,
                DisplayNameGenerator = options.DisplayNameGenerator ?? GetDisplayName,
                PreferredImageTypesGenerator = GetPreferredImageTypes,

                ShowSidebarGenerator = GetShowSidebar,
                ScrollDirectionGenerator = GetScrollDirection,

                AutoSelectFirstItem = true,

                ShowLoadingAnimation = true,

                PlayAllFromHereOnPlayCommand = playAllFromHere,
                PlayAllFromHereOnNavigateCommand = playAllFromHere
            };

            if (options.ShowTitle)
            {
                _viewModel.OnItemCreated = v =>
                {
                    v.DisplayNameVisibility = Visibility.Visible;
                };
            }

            _viewModel.AddIndexOptions(options.IndexOptions);

            _viewModel.PropertyChanged += _viewModel_PropertyChanged;

            _viewModel.DisplayPreferences = displayPreferences;

            if (!string.IsNullOrEmpty(options.IndexValue))
            {
                var index = options.IndexOptions.First(i => string.Equals(i.Name, options.IndexValue));
                _viewModel.IndexOptionsCollectionView.MoveCurrentTo(index);
            }

            DataContext = _viewModel;
        }

        public FolderPage(BaseItemDto parent, DisplayPreferences displayPreferences, IApiClient apiClient, IImageManager imageManager, ISessionManager sessionManager, IPresentationManager presentation, INavigationService navigationManager, IPlaybackManager playbackManager, ILogger logger, IServerEvents serverEvents, ListPageConfig options)
        {
            _navigationManager = navigationManager;
            _playbackManager = playbackManager;
            _logger = logger;
            _serverEvents = serverEvents;
            _presentationManager = presentation;
            _sessionManager = sessionManager;
            _imageManager = imageManager;
            _apiClient = apiClient;
            _options = options;
            _displayPreferences = displayPreferences;

            _parentItem = parent;

            InitializeComponent();

            Loaded += FolderPage_Loaded;
            Unloaded += FolderPage_Unloaded;

            SetDefaults(displayPreferences);

            _viewModel = new ItemListViewModel(GetItemsAsync, _presentationManager, _imageManager, _apiClient, _navigationManager, _playbackManager, _logger, _serverEvents)
            {
                ImageDisplayHeightGenerator = GetImageDisplayHeight,
                DisplayNameGenerator = GetDisplayName,
                PreferredImageTypesGenerator = GetPreferredImageTypes,

                ShowSidebarGenerator = GetShowSidebar,
                ScrollDirectionGenerator = GetScrollDirection,

                AutoSelectFirstItem = true,

                ShowLoadingAnimation = true
            };

            _viewModel.AddIndexOptions(options.IndexOptions);

            _viewModel.PropertyChanged += _viewModel_PropertyChanged;

            _viewModel.DisplayPreferences = displayPreferences;

            DataContext = _viewModel;

            UpdateSortTitle();
            UpdateSortOrder();

            BtnSort.Visibility = _options.SortOptions.Count > 0
                                     ? Visibility.Visible
                                     : Visibility.Collapsed;

            BtnSort.Click += BtnSort_Click;
        }

        public FolderPage(BaseItemDto parent, DisplayPreferences displayPreferences, IApiClient apiClient, IImageManager imageManager, IPresentationManager presentation, INavigationService navigationManager, IPlaybackManager playbackManager, ILogger logger, IServerEvents serverEvents, ListPageConfig options)
        {
            _logger = logger;
            _presentationManager = presentation;
            _imageManager = imageManager;
            _apiClient = apiClient;
            _options = options;

            _parentItem = parent;

            InitializeComponent();

            Loaded += FolderPage_Loaded;

            SetDefaults(displayPreferences);

            _viewModel = new ItemListViewModel(vm => options.CustomItemQuery(vm, displayPreferences), _presentationManager, _imageManager, _apiClient, navigationManager, playbackManager, _logger, serverEvents)
            {
                ImageDisplayHeightGenerator = GetImageDisplayHeight,
                DisplayNameGenerator = options.DisplayNameGenerator ?? GetDisplayName,
                PreferredImageTypesGenerator = GetPreferredImageTypes,

                ShowSidebarGenerator = GetShowSidebar,
                ScrollDirectionGenerator = GetScrollDirection,

                AutoSelectFirstItem = true,

                ShowLoadingAnimation = true
            };

            _viewModel.AddIndexOptions(options.IndexOptions);

            _viewModel.PropertyChanged += _viewModel_PropertyChanged;

            _viewModel.DisplayPreferences = displayPreferences;

            if (!string.IsNullOrEmpty(options.IndexValue))
            {
                var index = options.IndexOptions.First(i => string.Equals(i.Name, options.IndexValue));
                _viewModel.IndexOptionsCollectionView.MoveCurrentTo(index);
            }

            DataContext = _viewModel;
        }

        private void LoadMatchedItemsViewModel()
        {
            MatchedItemsViewModel = new ItemListViewModel(s => Task.FromResult(_searchedItemsResult), _presentationManager, _imageManager, _apiClient, _navService, _playbackManager, _logger, _serverEvents)
            {
               ImageDisplayWidth = TileWidth,
               ImageDisplayHeightGenerator = vm => TileHeight,
               DisplayNameGenerator = GetDisplayName,
               PreferredImageTypesGenerator = vm => new[] { ImageType.Thumb, ImageType.Primary }, //   vm => _preferredImageTypes,
               ScrollDirection = ScrollDirection.Horizontal,
               EnableBackdropsForCurrentItem = false,
               ShowSidebar = false,
               AutoSelectFirstItem = false,
               ShowLoadingAnimation = true,
               IsVirtualizationRequired= false,
            };

            MatchedItemsViewModel.ItemContainerWidth = TileWidth + 5;
            MatchedItemsViewModel.ItemContainerHeight = TileHeight + 5;
            OnPropertyChanged("MatchedItemsViewModel");
        }

        private Task<ItemsResult> GetSeriesByGenre(ItemListViewModel viewModel, DisplayPreferences displayPreferences)
        {
            var query = new ItemQuery
            {
                Fields = FolderPage.QueryFields,

                UserId = _sessionManager.LocalUserId,

                IncludeItemTypes = new[] { "Series" },

                SortBy = !String.IsNullOrEmpty(displayPreferences.SortBy)
                             ? new[] { displayPreferences.SortBy }
                             : new[] { ItemSortBy.SortName },

                SortOrder = displayPreferences.SortOrder,

                Recursive = true,
                ParentId = ParentId

            };

            var indexOption = viewModel.CurrentIndexOption;

            if (indexOption != null)
            {
                query.Genres = new[] { indexOption.Name };
            }

            return ApiClient.GetItemsAsync(query, CancellationToken.None);
        }

        private void LoadNextUpViewModel(TvView view)
        {
            NextUpViewModel = new ItemListViewModel(GetNextUpAsync, PresentationManager, _imageManager, ApiClient, _navService, _playbackManager, _logger)
            {
                ImageDisplayWidth = TileWidth,
                ImageDisplayHeightGenerator = v => TileHeight,
                DisplayNameGenerator = i => i.SeriesName,
                EnableBackdropsForCurrentItem = false,
                EnableServerImageEnhancers = false,

                OnItemCreated = vm =>
                {
                    vm.DisplayNameVisibility = Visibility.Visible;
                }
            };

            OnPropertyChanged("NextUpViewModel");
        }

        private void LoadLatestEpisodesViewModel(TvView view)
        {
            LatestEpisodesViewModel = new ItemListViewModel(GetLatestEpisodes, PresentationManager, _imageManager, ApiClient, _navService, _playbackManager, _logger, _serverEvents)
            {
                ImageDisplayWidth = TileWidth,
                ImageDisplayHeightGenerator = v => TileHeight,
                DisplayNameGenerator = HomePageViewModel.GetDisplayName,
                EnableBackdropsForCurrentItem = false,
                EnableServerImageEnhancers = false,

                OnItemCreated = vm =>
                {
                    vm.DisplayNameVisibility = Visibility.Visible;
                }
            };

            OnPropertyChanged("LatestEpisodesViewModel");
        }

        private Task<ItemsResult> GetAlbumSongs(ItemListViewModel viewModel)
        {
            var item = ItemViewModel.Item;

            var query = new ItemQuery
            {
                UserId = _sessionManager.LocalUserId,
                Fields = new[]
                        {
                                 ItemFields.PrimaryImageAspectRatio,
                                 ItemFields.DateCreated,
                                 ItemFields.Overview
                        },
                ParentId = item.Id,
                SortBy = new[] { ItemSortBy.SortName },

                Recursive = true,

                IncludeItemTypes = new[] { "Audio" }
            };

            return _apiClient.GetItemsAsync(query, CancellationToken.None);
        }

        private Task<ItemsResult> GetSeasons(ItemListViewModel viewModel)
        {
            var item = ItemViewModel.Item;

            var query = new SeasonQuery
            {
                UserId = _sessionManager.LocalUserId,
                Fields = new[]
                        {
                                 ItemFields.PrimaryImageAspectRatio,
                                 ItemFields.DateCreated,
                                 ItemFields.Overview
                        },
                SeriesId = item.Id
            };

            return _apiClient.GetSeasonsAsync(query, CancellationToken.None);
        }

        private Task<ItemsResult> GetSoundtracks(ItemListViewModel viewModel)
        {
            var item = ItemViewModel.Item;

            var query = new ItemQuery
            {
                UserId = _sessionManager.LocalUserId,
                Fields = new[]
                        {
                                 ItemFields.PrimaryImageAspectRatio,
                                 ItemFields.DateCreated
                        },
                Ids = item.SoundtrackIds,
                SortBy = new[] { ItemSortBy.SortName }
            };

            return _apiClient.GetItemsAsync(query, CancellationToken.None);
        }

        private Task<ItemsResult> GetMovies(ItemListViewModel viewModel, DisplayPreferences displayPreferences)
        {
            var query = new ItemQuery
            {
                Fields = FolderPage.QueryFields,

                UserId = _sessionManager.CurrentUser.Id,

                IncludeItemTypes = new[] { "Movie" },

                SortBy = !String.IsNullOrEmpty(displayPreferences.SortBy)
                             ? new[] { displayPreferences.SortBy }
                             : new[] { ItemSortBy.SortName },

                SortOrder = displayPreferences.SortOrder,

                Recursive = true
            };

            var indexOption = viewModel.CurrentIndexOption == null ? string.Empty : viewModel.CurrentIndexOption.Name;

            if (string.Equals(indexOption, "TopRated"))
            {
                query.MinCommunityRating = ApiClientExtensions.TopMovieCommunityRating;

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (string.Equals(indexOption, "Unwatched"))
            {
                query.Filters = new[] { ItemFilter.IsUnplayed };
            }
            else if (string.Equals(indexOption, "NewReleases"))
            {
                query.SortBy = new[] { ItemSortBy.ProductionYear, ItemSortBy.PremiereDate };
                query.SortOrder = SortOrder.Descending;
                query.Limit = 100;
            }
            else if (string.Equals(indexOption, "HDMovies"))
            {
                query.IsHD = true;

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (string.Equals(indexOption, "3DMovies"))
            {
                query.Is3D = true;

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (string.Equals(indexOption, "Trailers"))
            {
                query.IncludeItemTypes = new[] { "Trailer" };

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (string.Equals(indexOption, "BoxSets"))
            {
                query.IncludeItemTypes = new[] { "BoxSet" };

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (string.Equals(indexOption, "FavoriteMovies"))
            {
                query.Filters = new[] { ItemFilter.IsFavorite };

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (string.Equals(indexOption, "TopCriticRated"))
            {
                query.MinCriticRating = 95;

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (string.Equals(indexOption, "Family"))
            {
                query.Genres = new[] { "Family" };

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (indexOption.StartsWith("Genre:"))
            {
                query.Genres = new[] { indexOption.Split(':').Last() };

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
            }
            else if (indexOption.StartsWith("Studio:"))
            {
                query.Studios = new[] { indexOption.Split(':').Last() };

                query.SortBy = new[] { ItemSortBy.SortName };
                query.SortOrder = SortOrder.Ascending;
//.........这里部分代码省略.........

        private Task<ItemsResult> GetLatestMoviesAsync(ItemListViewModel viewModel)
        {
            var result = new ItemsResult
            {
                Items = _moviesView.LatestMovies.ToArray(),
                TotalRecordCount = _moviesView.LatestMovies.Count
            };

            return Task.FromResult(result);
        }

        private void LoadLatestTrailersViewModel(MoviesView view)
        {
            LatestTrailersViewModel = new ItemListViewModel(GetLatestTrailersAsync, PresentationManager, _imageManager, ApiClient, _navService, _playbackManager, _logger, _serverEvents)
            {
                ImageDisplayWidth = _posterTileWidth,
                ImageDisplayHeightGenerator = v => _posterTileHeight,
                DisplayNameGenerator = HomePageViewModel.GetDisplayName,
                PreferredImageTypesGenerator = vm => new[] { ImageType.Primary },
                EnableBackdropsForCurrentItem = false
            };

            OnPropertyChanged("LatestTrailersViewModel");

            LatestTrailersVisibility = view.TrailerItems.Count > 0 ? Visibility.Visible : Visibility.Collapsed;
        }

        private Task<ItemsResult> GetChildren(ItemListViewModel viewModel)
        {
            var item = ItemViewModel.Item;

            var query = new ItemQuery
            {
                UserId = _sessionManager.CurrentUser.Id,
                Fields = new[]
                        {
                                 ItemFields.PrimaryImageAspectRatio,
                                 ItemFields.DateCreated,
                                 ItemFields.Overview
                        },
                ParentId = item.Id,
                SortBy = new[] { ItemSortBy.SortName }
            };

            return _apiClient.GetItemsAsync(query, CancellationToken.None);
        }

        private Task<ItemsResult> GetSeasons(ItemListViewModel viewModel)
        {
            var item = ItemViewModel.Item;

            var query = new SeasonQuery
            {
                UserId = _sessionManager.CurrentUser.Id,
                Fields = new[]
                        {
                                 ItemFields.PrimaryImageAspectRatio,
                                 ItemFields.DateCreated,
                                 ItemFields.Overview
                        },
                SeriesId = item.Id,
                IsSpecialSeason = false
            };

            return _apiClient.GetSeasonsAsync(query);
        }