2020-06-10 18:17:54 +00:00
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import 'dart:async';
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2020-11-12 13:25:57 +00:00
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import 'dart:math';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:logging/logging.dart';
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import 'package:photos/events/files_updated_event.dart';
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import 'package:photos/models/file.dart';
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import 'package:photos/models/selected_files.dart';
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import 'package:photos/ui/common_elements.dart';
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import 'package:photos/ui/gallery_app_bar_widget.dart';
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import 'package:photos/ui/huge_listview/huge_listview.dart';
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import 'package:photos/ui/huge_listview/lazy_loading_gallery.dart';
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import 'package:photos/ui/huge_listview/place_holder_widget.dart';
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import 'package:photos/ui/loading_widget.dart';
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import 'package:photos/utils/date_time_util.dart';
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import 'package:scrollable_positioned_list/scrollable_positioned_list.dart';
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class Gallery extends StatefulWidget {
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final Future<List<File>> Function(int creationStartTime, int creationEndTime,
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{int limit}) asyncLoader;
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final Stream<FilesUpdatedEvent> reloadEvent;
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final SelectedFiles selectedFiles;
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final String tagPrefix;
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final Widget headerWidget;
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final bool isHomePageGallery;
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Gallery({
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@required this.asyncLoader,
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@required this.selectedFiles,
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@required this.tagPrefix,
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this.reloadEvent,
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this.headerWidget,
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this.isHomePageGallery = false,
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});
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@override
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_GalleryState createState() {
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return _GalleryState();
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}
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}
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class _GalleryState extends State<Gallery> {
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static const int kPageSize = 10;
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final _hugeListViewKey = GlobalKey<HugeListViewState>();
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Logger _logger;
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int _pageIndex = 0;
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List<List<File>> _collatedFiles = [];
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bool _hasLoadedFiles = false;
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StreamSubscription<FilesUpdatedEvent> _reloadEventSubscription;
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@override
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void initState() {
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_logger = Logger("Gallery_" + widget.tagPrefix);
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if (widget.reloadEvent != null) {
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_reloadEventSubscription = widget.reloadEvent.listen((event) {
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_logger.info("Building gallery because reload event fired");
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_loadFiles();
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});
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}
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widget.selectedFiles.addListener(() {
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_logger.info("Building gallery because selected files updated");
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setState(() {});
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});
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_loadFiles();
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super.initState();
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}
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Future<bool> _loadFiles({int limit}) async {
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_logger.info("Loading files");
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final startTime = DateTime.now();
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final files = await widget
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.asyncLoader(0, DateTime.now().microsecondsSinceEpoch, limit: limit);
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final endTime = DateTime.now();
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final duration = Duration(
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microseconds:
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endTime.microsecondsSinceEpoch - startTime.microsecondsSinceEpoch);
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_logger.info("Time taken: " + duration.inMilliseconds.toString() + "ms");
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final collatedFiles = _collateFiles(files);
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if (_collatedFiles.length != collatedFiles.length) {
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if (mounted) {
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_logger.info("New day discovered");
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setState(() {
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_hasLoadedFiles = true;
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_collatedFiles = collatedFiles;
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});
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}
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}
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return true;
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}
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@override
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void dispose() {
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_reloadEventSubscription.cancel();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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_logger.info("Building " + widget.tagPrefix);
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if (!_hasLoadedFiles) {
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return loadWidget;
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}
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var gallery = _getListView();
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if (widget.isHomePageGallery) {
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gallery = Container(
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margin: const EdgeInsets.only(bottom: 50),
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child: gallery,
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);
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if (widget.selectedFiles.files.isNotEmpty) {
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gallery = Stack(children: [
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gallery,
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Container(
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height: 60,
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child: GalleryAppBarWidget(
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GalleryAppBarType.homepage,
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null,
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widget.selectedFiles,
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),
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),
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]);
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}
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}
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return gallery;
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}
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Widget _getListView() {
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return HugeListView<List<File>>(
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key: _hugeListViewKey,
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controller: ItemScrollController(),
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pageSize: kPageSize,
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startIndex: _pageIndex,
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totalCount: _collatedFiles.length,
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isDraggableScrollbarEnabled: _collatedFiles.length > 30,
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page: (pageIndex) {
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_pageIndex = pageIndex;
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final endTimeIndex =
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min(pageIndex * kPageSize, _collatedFiles.length - 1);
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final startTimeIndex =
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min((pageIndex + 1) * kPageSize, _collatedFiles.length - 1);
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List<List<File>> result = [];
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for (int index = endTimeIndex; index <= startTimeIndex; index++) {
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result.add(_collatedFiles[index]);
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}
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return result;
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},
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placeholderBuilder: (context, pageIndex) {
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var day = getDayWidget(_collatedFiles[pageIndex][0].creationTime);
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return Padding(
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padding: const EdgeInsets.only(bottom: 12),
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child: Column(
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children: [
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day,
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PlaceHolderWidget(_collatedFiles[pageIndex].length),
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],
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),
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);
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},
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waitBuilder: (_) {
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return loadWidget;
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},
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emptyResultBuilder: (_) {
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return nothingToSeeHere;
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},
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itemBuilder: (context, index, files) {
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var gallery;
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gallery = LazyLoadingGallery(
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files,
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widget.reloadEvent,
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widget.asyncLoader,
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widget.selectedFiles,
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widget.tagPrefix,
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);
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if (widget.headerWidget != null && index == 0) {
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gallery = Column(children: [widget.headerWidget, gallery]);
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}
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return gallery;
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},
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labelTextBuilder: (int index) {
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return getMonthAndYear(DateTime.fromMicrosecondsSinceEpoch(
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_collatedFiles[index][0].creationTime));
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},
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thumbBackgroundColor: Color(0xFF151515),
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thumbDrawColor: Colors.white.withOpacity(0.5),
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velocityThreshold: 128,
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);
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}
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List<List<File>> _collateFiles(List<File> files) {
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final List<File> dailyFiles = [];
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final List<List<File>> collatedFiles = [];
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for (int index = 0; index < files.length; index++) {
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if (index > 0 &&
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!_areFromSameDay(
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files[index - 1].creationTime, files[index].creationTime)) {
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final List<File> collatedDailyFiles = [];
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collatedDailyFiles.addAll(dailyFiles);
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collatedFiles.add(collatedDailyFiles);
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dailyFiles.clear();
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}
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dailyFiles.add(files[index]);
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}
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if (dailyFiles.isNotEmpty) {
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collatedFiles.add(dailyFiles);
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}
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return collatedFiles;
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}
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bool _areFromSameDay(int firstCreationTime, int secondCreationTime) {
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var firstDate = DateTime.fromMicrosecondsSinceEpoch(firstCreationTime);
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var secondDate = DateTime.fromMicrosecondsSinceEpoch(secondCreationTime);
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return firstDate.year == secondDate.year &&
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firstDate.month == secondDate.month &&
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firstDate.day == secondDate.day;
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}
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}
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