96 lines
3.1 KiB
Dart
96 lines
3.1 KiB
Dart
import 'package:collection/collection.dart' show IterableExtension;
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import 'package:flutter/foundation.dart';
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import 'package:photos/core/event_bus.dart';
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import 'package:photos/events/clear_selections_event.dart';
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import 'package:photos/models/file/file.dart';
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class SelectedFiles extends ChangeNotifier {
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final files = <EnteFile>{};
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///This variable is used to track the files that were involved in last selection
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///operation (select/unselect). Each [LazyGridView] checks this variable on
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///change in [SelectedFiles] to see if any of it's files were involved in last
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///select/unselect operation. If yes, then it will rebuild itself.
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final lastSelectionOperationFiles = <EnteFile>{};
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void toggleSelection(EnteFile fileToToggle) {
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// To handle the cases, where the file might have changed due to upload
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// or any other update, using file.generatedID to track if this file was already
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// selected or not
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final EnteFile? alreadySelected = files.firstWhereOrNull(
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(element) => _isMatch(fileToToggle, element),
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);
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if (alreadySelected != null) {
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files.remove(alreadySelected);
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} else {
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files.add(fileToToggle);
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}
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lastSelectionOperationFiles.clear();
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lastSelectionOperationFiles.add(fileToToggle);
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notifyListeners();
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}
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void toggleGroupSelection(Set<EnteFile> filesToToggle) {
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if (files.containsAll(filesToToggle)) {
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unSelectAll(filesToToggle);
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} else {
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selectAll(filesToToggle);
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}
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}
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void selectAll(Set<EnteFile> filesToSelect) {
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files.addAll(filesToSelect);
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lastSelectionOperationFiles.clear();
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lastSelectionOperationFiles.addAll(filesToSelect);
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notifyListeners();
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}
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void unSelectAll(Set<EnteFile> filesToUnselect, {bool skipNotify = false}) {
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files.removeWhere((file) => filesToUnselect.contains(file));
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lastSelectionOperationFiles.clear();
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lastSelectionOperationFiles.addAll(filesToUnselect);
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if (!skipNotify) {
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notifyListeners();
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}
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}
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bool isFileSelected(EnteFile file) {
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final EnteFile? alreadySelected = files.firstWhereOrNull(
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(element) => _isMatch(file, element),
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);
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return alreadySelected != null;
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}
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bool isPartOfLastSelected(EnteFile file) {
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final EnteFile? matchedFile = lastSelectionOperationFiles.firstWhereOrNull(
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(element) => _isMatch(file, element),
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);
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return matchedFile != null;
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}
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bool _isMatch(EnteFile first, EnteFile second) {
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if (first.generatedID != null && second.generatedID != null) {
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if (first.generatedID == second.generatedID) {
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return true;
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}
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} else if (first.uploadedFileID != null && second.uploadedFileID != null) {
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return first.uploadedFileID == second.uploadedFileID;
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}
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return false;
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}
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void clearAll() {
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Bus.instance.fire(ClearSelectionsEvent());
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lastSelectionOperationFiles.addAll(files);
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files.clear();
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notifyListeners();
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}
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///Retains only the files that are present in the [filesToRetain] set in
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///[files]. Takes the intersection of the two sets.
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void retainFiles(Set<EnteFile> filesToRetain) {
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files.retainAll(filesToRetain);
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notifyListeners();
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}
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}
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