aves/lib/widgets/settings/privacy/file_picker/file_picker.dart

import 'dart:io';

import 'package:aves/model/settings/settings.dart';
import 'package:aves/services/common/services.dart';
import 'package:aves/theme/durations.dart';
import 'package:aves/theme/icons.dart';
import 'package:aves/utils/android_file_utils.dart';
import 'package:aves/widgets/common/basic/menu.dart';
import 'package:aves/widgets/common/extensions/build_context.dart';
import 'package:aves/widgets/common/identity/buttons.dart';
import 'package:aves/widgets/common/identity/empty.dart';
import 'package:aves/widgets/common/providers/media_query_data_provider.dart';
import 'package:aves/widgets/settings/privacy/file_picker/crumb_line.dart';
import 'package:collection/collection.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';

class FilePicker extends StatefulWidget {
  static const routeName = '/file_picker';

  const FilePicker({Key? key}) : super(key: key);

  @override
  _FilePickerState createState() => _FilePickerState();
}

class _FilePickerState extends State<FilePicker> {
  late VolumeRelativeDirectory _directory;
  List<Directory>? _contents;

  Set<StorageVolume> get volumes => androidFileUtils.storageVolumes;

  String get currentDirectoryPath => pContext.join(_directory.volumePath, _directory.relativeDir);

  @override
  void initState() {
    super.initState();
    final primaryVolume = volumes.firstWhere((v) => v.isPrimary);
    _goTo(primaryVolume.path);
  }

  @override
  Widget build(BuildContext context) {
    final l10n = context.l10n;
    final showHidden = settings.filePickerShowHiddenFiles;
    final visibleContents = _contents?.where((v) {
      if (showHidden) {
        return true;
      } else {
        final isHidden = pContext.split(v.path).last.startsWith('.');
        return !isHidden;
      }
    }).toList();
    return WillPopScope(
      onWillPop: () {
        if (_directory.relativeDir.isEmpty) {
          return SynchronousFuture(true);
        }
        final parent = pContext.dirname(currentDirectoryPath);
        _goTo(parent);
        setState(() {});
        return SynchronousFuture(false);
      },
      child: MediaQueryDataProvider(
        child: Scaffold(
          appBar: AppBar(
            title: Text(_getTitle(context)),
            actions: [
              MenuIconTheme(
                child: PopupMenuButton<_PickerAction>(
                  itemBuilder: (context) {
                    return [
                      PopupMenuItem(
                        value: _PickerAction.toggleHiddenView,
                        child: MenuRow(text: showHidden ? l10n.filePickerDoNotShowHiddenFiles : l10n.filePickerShowHiddenFiles),
                      ),
                    ];
                  },
                  onSelected: (action) async {
                    // wait for the popup menu to hide before proceeding with the action
                    await Future.delayed(Durations.popupMenuAnimation * timeDilation);
                    switch (action) {
                      case _PickerAction.toggleHiddenView:
                        settings.filePickerShowHiddenFiles = !showHidden;
                        setState(() {});
                        break;
                    }
                  },
                ),
              ),
            ],
          ),
          drawer: _buildDrawer(context),
          body: SafeArea(
            child: Column(
              children: [
                SizedBox(
                  height: kMinInteractiveDimension,
                  child: CrumbLine(
                    directory: _directory,
                    onTap: (path) {
                      _goTo(path);
                      setState(() {});
                    },
                  ),
                ),
                const Divider(height: 0),
                Expanded(
                  child: visibleContents == null
                      ? const SizedBox()
                      : visibleContents.isEmpty
                          ? Center(
                              child: EmptyContent(
                                icon: AIcons.folder,
                                text: l10n.filePickerNoItems,
                              ),
                            )
                          : ListView.builder(
                              itemCount: visibleContents.length,
                              itemBuilder: (context, index) {
                                return index < visibleContents.length ? _buildContentLine(context, visibleContents[index]) : const SizedBox();
                              },
                            ),
                ),
                const Divider(height: 0),
                Padding(
                  padding: const EdgeInsets.all(8),
                  child: AvesOutlinedButton(
                    label: l10n.filePickerUseThisFolder,
                    onPressed: () => Navigator.pop(context, currentDirectoryPath),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  String _getTitle(BuildContext context) {
    if (_directory.relativeDir.isEmpty) {
      return _directory.getVolumeDescription(context);
    }
    return pContext.split(_directory.relativeDir).last;
  }

  Widget _buildDrawer(BuildContext context) {
    return Drawer(
      child: ListView(
        children: [
          Padding(
            padding: const EdgeInsets.all(16),
            child: Text(
              context.l10n.filePickerOpenFrom,
              style: Theme.of(context).textTheme.headline5,
            ),
          ),
          ...volumes.map((v) {
            final icon = v.isRemovable ? AIcons.removableStorage : AIcons.mainStorage;
            return ListTile(
              leading: Icon(icon),
              title: Text(v.getDescription(context)),
              onTap: () async {
                Navigator.pop(context);
                await Future.delayed(Durations.drawerTransitionAnimation);
                _goTo(v.path);
                setState(() {});
              },
              selected: _directory.volumePath == v.path,
            );
          })
        ],
      ),
    );
  }

  Widget _buildContentLine(BuildContext context, FileSystemEntity content) {
    return ListTile(
      leading: const Icon(AIcons.folder),
      title: Text(pContext.split(content.path).last),
      onTap: () {
        _goTo(content.path);
        setState(() {});
      },
    );
  }

  void _goTo(String path) {
    _directory = VolumeRelativeDirectory.fromPath(path)!;
    _contents = null;
    final contents = <Directory>[];
    Directory(currentDirectoryPath).list().listen((event) {
      final entity = event.absolute;
      if (entity is Directory) {
        contents.add(entity);
      }
    }, onDone: () {
      _contents = contents..sort((a, b) => compareAsciiUpperCase(pContext.split(a.path).last, pContext.split(b.path).last));
      setState(() {});
    });
  }
}

enum _PickerAction { toggleHiddenView }