132 lines
4.8 KiB
Dart
132 lines
4.8 KiB
Dart
import 'dart:async';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_cache_manager/flutter_cache_manager.dart';
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import '/features/core/abstracts/base_view_model.dart';
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import '/features/core/data/extensions/value_notifier_extensions.dart';
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import '/features/core/services/navigation_service.dart';
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import '/locator.dart';
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import '../../data/enums/search_option.dart';
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import '../../data/models/image_model.dart';
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import '../../services/image_cache_manager_service.dart';
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import '../../services/images_service.dart';
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import '../image_carousel/image_carousel_view.dart';
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class GalleryViewModel extends BaseViewModel {
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GalleryViewModel({
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required ImagesService imagesService,
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required NavigationService navigationService,
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required ImageCacheManagerService imageCacheManagerService,
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}) : _imagesService = imagesService,
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_navigationService = navigationService,
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_imageCacheManagerService = imageCacheManagerService;
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final ImagesService _imagesService;
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final NavigationService _navigationService;
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//todo(mehul): Use to implement pull-to-refresh or an extra widget
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final ImageCacheManagerService _imageCacheManagerService;
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final ValueNotifier<bool> _isDisplayingPressingPrompt = ValueNotifier(true);
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ValueListenable<bool> get isDisplayingPressingPrompt => _isDisplayingPressingPrompt;
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final ValueNotifier<bool> _isSearchingNotifier = ValueNotifier(false);
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ValueListenable<bool> get isSearchingListenable => _isSearchingNotifier;
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final ValueNotifier<SearchOption> _searchOptionNotifier = ValueNotifier(SearchOption.web);
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ValueListenable<SearchOption> get searchOptionListenable => _searchOptionNotifier;
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final ValueNotifier<List<ImageModel>> _imageSearchResultsNotifier = ValueNotifier([]);
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ValueListenable<List<ImageModel>> get imageSearchResultsListenable => _imageSearchResultsNotifier;
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final ValueNotifier<bool> _isViewingFavouriteNotifier = ValueNotifier(false);
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ValueListenable<bool> get isViewingFavouriteListenable => _isViewingFavouriteNotifier;
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@override
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Future<void> initialise(bool Function() mounted, [Object? arguments]) async {
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super.initialise(mounted, arguments);
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}
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@override
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Future<void> dispose() async {
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super.dispose();
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}
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Future<void> onSearchTermUpdate(String searchTerm) async {
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// If empty-string (from backspacing) -> reset state.
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if (searchTerm.isEmpty) {
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_imageSearchResultsNotifier.value = [];
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log.info('Clearing results on search string removal');
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return;
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}
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// Detached call to prevent UI blocking
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unawaited(
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_imagesService
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.searchImages(
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imageNamePart: searchTerm,
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searchOption: searchOptionListenable.value,
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)
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.then(
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(final fetchedImageModels) => _imageSearchResultsNotifier.value = fetchedImageModels),
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);
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// Force-update to trigger listening to `lastQueryResultDone()`.
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_imageSearchResultsNotifier.notifyListeners();
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}
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void searchPressed() {
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// If transitioning from 'Searching', clear previous results immediately
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if (_isSearchingNotifier.value) {
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_imageSearchResultsNotifier.value = [];
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log.info('Clearing of results on view mode change');
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}
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_isSearchingNotifier.flipValue();
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}
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Future<void> get lastQueryResultDone => _imagesService.lastQueryIsCompleted;
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void onSearchOptionChanged(SearchOption? option) {
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_searchOptionNotifier.value = option!;
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log.info('Switched over to $option search');
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_imageSearchResultsNotifier.value = [];
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log.info('Cleared resultsw from view');
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//todo(mehul): Either redo search or force user to type in new (trigger) by clearing field
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}
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void onFavouriteViewChange(bool newValue) => _isViewingFavouriteNotifier.value = newValue;
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void updateImageFavouriteStatus({
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required ImageModel imageModel,
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required bool newFavouriteStatus,
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}) {
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_imagesService.updateImageFavouriteStatus(
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imageModel: imageModel,
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newFavouriteStatus: newFavouriteStatus,
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);
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}
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Iterable<ImageModel> get favouriteImageModels =>
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imageModels.where((final imageModel) => imageModel.isFavourite);
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void onPromptPressed() => _isDisplayingPressingPrompt.value = false;
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Iterable<ImageModel> get imageModels => _imagesService.imageModels;
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Future<void> get initImageFetchIsDone => _imagesService.initAwaiter;
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double? downloadProgressValue({required DownloadProgress progress}) =>
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progress.totalSize != null ? progress.downloaded / progress.totalSize! : null;
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void pushImageCarouselView(BuildContext context, {required ImageModel imageModel}) =>
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_navigationService.pushImageCarouselView(
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context,
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imageCarouselViewArguments: ImageCarouselViewArguments(
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imageIndexKey: imageModel.imageIndex,
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),
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);
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static GalleryViewModel get locate => Locator.locate();
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}
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