50 lines
1.3 KiB
Dart
50 lines
1.3 KiB
Dart
// @dart=2.9
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import 'package:flutter/foundation.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.firstWhere(
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(element) => element.generatedID == file.generatedID,
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orElse: () => null,
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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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bool isFileSelected(File file) {
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final File alreadySelected = files.firstWhere(
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(element) => element.generatedID == file.generatedID,
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orElse: () => null,
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);
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return alreadySelected != null;
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}
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bool isPartOfLastSection(File file) {
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final File alreadySelected = lastSelections.firstWhere(
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(element) => element.generatedID == file.generatedID,
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orElse: () => null,
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);
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return alreadySelected != null;
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}
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void clearAll() {
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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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