ente/lib/ui/backup_folder_selection_page.dart

import 'package:flutter/material.dart';
import 'package:photos/core/configuration.dart';
import 'package:photos/core/event_bus.dart';
import 'package:photos/db/files_db.dart';
import 'package:photos/events/backup_folders_updated_event.dart';
import 'package:photos/models/file.dart';
import 'package:photos/ui/common_elements.dart';
import 'package:photos/ui/loading_widget.dart';
import 'package:photos/ui/thumbnail_widget.dart';

class BackupFolderSelectionPage extends StatefulWidget {
  final bool shouldSelectAll;

  const BackupFolderSelectionPage(
    this.shouldSelectAll, {
    Key key,
  }) : super(key: key);

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

class _BackupFolderSelectionPageState extends State<BackupFolderSelectionPage> {
  Set<String> _backedupFolders = Set<String>();
  List<File> _latestFiles;
  final _allFolders = Set<String>();
  bool _isSelectAll = false;

  @override
  void initState() {
    _backedupFolders = Configuration.instance.getPathsToBackUp();
    _isSelectAll = widget.shouldSelectAll;
    FilesDB.instance.getLatestLocalFiles().then((files) {
      setState(() {
        _latestFiles = files;
        for (final file in _latestFiles) {
          _allFolders.add(file.deviceFolder);
        }
        if (widget.shouldSelectAll) {
          _backedupFolders.addAll(_allFolders);
        }
        _isSelectAll = _backedupFolders.length == _allFolders.length;
      });
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("select folders to backup")),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Padding(
            padding: EdgeInsets.all(12),
          ),
          Padding(
            padding: const EdgeInsets.only(left: 32, right: 32),
            child: Text(
              "the selected folders will be end-to-end encrypted and backed up",
              style: TextStyle(
                color: Colors.white.withOpacity(0.36),
                fontSize: 14,
                height: 1.3,
              ),
              textAlign: TextAlign.center,
            ),
          ),
          Padding(
            padding: EdgeInsets.all(6),
          ),
          GestureDetector(
              child: Padding(
                padding: const EdgeInsets.fromLTRB(6, 6, 64, 6),
                child: Align(
                  alignment: Alignment.centerRight,
                  child: Text(
                    _backedupFolders.length == _allFolders.length
                        ? "unselect all"
                        : "select all",
                    textAlign: TextAlign.right,
                    style: TextStyle(
                      fontSize: 12,
                      color: Colors.white.withOpacity(0.8),
                    ),
                  ),
                ),
              ),
              onTap: () {
                _isSelectAll = !_isSelectAll;
                if (_isSelectAll) {
                  _backedupFolders.addAll(_allFolders);
                } else {
                  _backedupFolders.clear();
                }
                setState(() {});
              }),
          Expanded(child: _getFolderList()),
          Padding(
            padding: EdgeInsets.all(20),
          ),
          Hero(
            tag: "select_folders",
            child: Container(
              padding: EdgeInsets.only(left: 60, right: 60, bottom: 32),
              child: button(
                "start backup",
                fontSize: 18,
                onPressed: _backedupFolders.length == 0
                    ? null
                    : () async {
                        await Configuration.instance
                            .setPathsToBackUp(_backedupFolders);
                        Bus.instance.fire(BackupFoldersUpdatedEvent());
                        Navigator.of(context).pop();
                      },
                padding: EdgeInsets.fromLTRB(60, 20, 60, 20),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _getFolderList() {
    Widget child;
    if (_latestFiles != null) {
      _latestFiles.sort((first, second) {
        return first.deviceFolder
            .toLowerCase()
            .compareTo(second.deviceFolder.toLowerCase());
      });
      final List<Widget> foldersWidget = [];
      for (final file in _latestFiles) {
        final isSelected = _backedupFolders.contains(file.deviceFolder);
        foldersWidget.add(
          Padding(
            padding: const EdgeInsets.only(bottom: 1, right: 4),
            child: Container(
              decoration: BoxDecoration(
                border: Border.all(
                  color: Colors.black,
                ),
                borderRadius: BorderRadius.all(
                  Radius.circular(10),
                ),
                color: isSelected
                    ? Color.fromRGBO(16, 32, 32, 1)
                    : Color.fromRGBO(8, 18, 18, 0.4),
              ),
              padding: EdgeInsets.fromLTRB(20, 16, 20, 16),
              child: InkWell(
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Container(
                      child: Expanded(
                        child: Row(
                          children: [
                            _getThumbnail(file),
                            Padding(padding: EdgeInsets.all(10)),
                            Expanded(
                              child: Text(
                                file.deviceFolder,
                                style: TextStyle(fontSize: 16, height: 1.5),
                                overflow: TextOverflow.clip,
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                    Checkbox(
                      value: isSelected,
                      onChanged: (value) {
                        if (value) {
                          _backedupFolders.add(file.deviceFolder);
                        } else {
                          _backedupFolders.remove(file.deviceFolder);
                        }
                        setState(() {});
                      },
                    ),
                  ],
                ),
                onTap: () {
                  final value = !_backedupFolders.contains(file.deviceFolder);
                  if (value) {
                    _backedupFolders.add(file.deviceFolder);
                  } else {
                    _backedupFolders.remove(file.deviceFolder);
                  }
                  setState(() {});
                },
              ),
            ),
          ),
        );
      }

      final scrollController = ScrollController();
      child = Scrollbar(
        isAlwaysShown: true,
        controller: scrollController,
        child: SingleChildScrollView(
          controller: scrollController,
          child: Container(
            padding: EdgeInsets.only(right: 4),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: foldersWidget,
            ),
          ),
        ),
      );
    } else {
      child = loadWidget;
    }
    return Container(
      padding: EdgeInsets.only(left: 40, right: 40),
      child: child,
    );
  }

  Widget _getThumbnail(File file) {
    return ClipRRect(
      borderRadius: BorderRadius.circular(4.0),
      child: Container(
        child: ThumbnailWidget(
          file,
          shouldShowSyncStatus: false,
          key: Key("backup_selection_widget" + file.tag()),
        ),
        height: 60,
        width: 60,
      ),
    );
  }
}