75 lines
2.1 KiB
Dart
75 lines
2.1 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.dart';
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class SelectedFiles extends ChangeNotifier {
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final files = <File>{};
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final lastSelections = <File>{};
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void toggleSelection(File file) {
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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 File? alreadySelected = files.firstWhereOrNull(
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(element) => _isMatch(file, 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(file);
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}
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lastSelections.clear();
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lastSelections.add(file);
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notifyListeners();
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}
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void selectAll(Set<File> selectedFiles) {
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files.addAll(selectedFiles);
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lastSelections.clear();
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lastSelections.addAll(selectedFiles);
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notifyListeners();
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}
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void unSelectAll(Set<File> selectedFiles, {bool skipNotify = false}) {
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files.removeAll(selectedFiles);
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lastSelections.clear();
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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(File file) {
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final File? 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(File file) {
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final File? matchedFile = lastSelections.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(File first, File 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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lastSelections.addAll(files);
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files.clear();
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notifyListeners();
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}
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}
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