libre_gps_parser/lib/edit_notes.dart

import 'package:permission_handler/permission_handler.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'global_helper_functions.dart';
import 'database_helper.dart';
import 'dart:io';

class EditNotes extends StatefulWidget {
  final String mapLocation;

  EditNotes({
    Key key,
    this.mapLocation,
  }) : super(key: key);

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

class _EditNotesState extends State<EditNotes> {

  final double textHeight = 1.5;
  final _textEditingController = TextEditingController();
  final dbHelper = DatabaseHelper.instance;
  String _inputText = '';
  String _oldNotes = '';

  @override
  void initState() {
    super.initState();
    loadNotes();
  }

  @override
  Widget build(BuildContext context) {
    Future<bool> _requestPop() {
      if (_inputText != _oldNotes) {
        showDialog(
          context: context,
          barrierDismissible: false,
          builder: (BuildContext context) {
            return AlertDialog(
              backgroundColor: ivory,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.all(Radius.circular(6.0)),
              ),
              content: Column(
                mainAxisSize: MainAxisSize.min,
                children: <Widget>[
                  Text(
                    'Discard your changes?',
                    textAlign: TextAlign.center,
                  ),
                  Container(
                    margin: EdgeInsets.only(
                      top: 40,
                      bottom: 10,
                    ),
                    child: Wrap(
                      runSpacing: 30,
                      children: <Widget>[
                        Container(
                          margin: EdgeInsets.symmetric(
                            horizontal: 15,
                          ),
                          child: ButtonTheme(
                            height: 75,
                            child: RaisedButton(
                              color: peacockBlue,
                              child: Text(
                                "No",
                                style: TextStyle(
                                  height: textHeight,
                                  color: Colors.white,
                                  fontSize: 24,
                                ),
                              ),
                              onPressed: () {
                                Navigator.of(context).pop();
                              }
                            ),
                          ),
                        ),
                        Container(
                          margin: EdgeInsets.symmetric(
                            horizontal: 15,
                          ),
                          child: ButtonTheme(
                            height: 75,
                            child: RaisedButton(
                              color: peacockBlue,
                              child: Text(
                                "Discard",
                                style: TextStyle(
                                  height: textHeight,
                                  color: Colors.white,
                                  fontSize: 24,
                                ),
                              ),
                              onPressed: () {
                                Navigator.of(context).pop();
                                Navigator.of(context).pop();
                              }
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
            );
          }
        );
        return Future.value(false);
      } else {
        return Future.value(true);
      }
    }

    return WillPopScope(
      onWillPop: _requestPop,
      child: Scaffold(
        backgroundColor: ivory,
        appBar: AppBar(
          title: const Text('Notes, MarkDown Supported'),
          actions: <Widget>[
            IconButton(
              icon: Icon(Icons.save),
              onPressed: () async{
                Navigator.of(context).pop(this._inputText);
                Map<String, dynamic> row = {
                  DatabaseHelper.columnMapLocation: widget.mapLocation,
                  DatabaseHelper.columnNotes: this._inputText,
                };
                await dbHelper.update(row);
              }
            ),
          ],
        ),
        body: Column(
          children: <Widget> [
            Expanded(
              child: TextField(
                controller: _textEditingController,
                keyboardType: TextInputType.multiline,
                maxLines: null,
                onChanged: (text) {
                  _inputText = text;
                },
              ),
            ),
            Row(
              children: <Widget> [
                Expanded(
                  child: Container(),
                ),
                Container(
                  margin: EdgeInsets.all(20.0),
                  child: ButtonTheme(
                    height: 55,
                    padding: EdgeInsets.only(
                        top: 5,
                        right: 12,
                        bottom: 12,
                        left: 10
                    ),
                    child: RaisedButton(
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.all(Radius.circular(6.0)),
                      ),
                      color: peacockBlue,
                      child: Text(
                        'Import',
                        style: TextStyle(
                          height: textHeight,
                          color: Colors.white,
                          fontSize: 24,
                        ),
                      ),
                      onPressed: () async{
                        Map<PermissionGroup, PermissionStatus> _storagePermissions;
                        PermissionStatus _storagePermission = await PermissionHandler().checkPermissionStatus(PermissionGroup.storage);
                        if (_storagePermission == PermissionStatus.denied) {
                          _storagePermissions = await PermissionHandler().requestPermissions([PermissionGroup.storage]);
                        }
                        if ((_storagePermission == PermissionStatus.granted) || (_storagePermissions.toString() == PermissionStatus.granted.toString())) {
                          showDialog(
                            context: context,
                            builder: (BuildContext context) {
                              return AlertDialog(
                                backgroundColor: ivory,
                                shape: RoundedRectangleBorder(
                                  borderRadius: BorderRadius.all(Radius.circular(6.0)),
                                ),
                                title: Text(
                                  'You can import a markdown (or plain text) file.',
                                  textAlign: TextAlign.center,
                                  style: TextStyle(
                                    color: candyApple,
                                  ),
                                ),
                                content: Column(
                                  mainAxisSize: MainAxisSize.min,
                                  children: <Widget>[
                                    Container(
                                      margin: EdgeInsets.only(
                                        top: 40,
                                        bottom: 10,
                                      ),
                                      child: ButtonTheme(
                                        height: 55,
                                        padding: EdgeInsets.only(
                                            top: 5,
                                            right: 12,
                                            bottom: 12,
                                            left: 10
                                        ),
                                        child: RaisedButton(
                                          shape: RoundedRectangleBorder(
                                            borderRadius: BorderRadius.all(Radius.circular(6.0)),
                                          ),
                                          color: peacockBlue,
                                          child: Text(
                                            'Select File',
                                            style: TextStyle(
                                              height: textHeight,
                                              color: Colors.white,
                                              fontSize: 24,
                                            ),
                                          ),
                                          onPressed: () async{
                                            String _filePath;
                                            _filePath = await FilePicker.getFilePath(type: FileType.ANY);
                                            Navigator.of(context).pop();
                                            try {
                                              String _contents = await File(_filePath).readAsString();
                                              setState(() {
                                                this._textEditingController.text = _contents;
                                                this._inputText = _contents;
                                              });
                                            } catch(e) {
                                              print(e);
                                              showDialog(
                                                context: context,
                                                builder: (BuildContext context) {
                                                  return AlertDialog(
                                                    backgroundColor: ivory,
                                                    shape: RoundedRectangleBorder(
                                                      borderRadius: BorderRadius.all(Radius.circular(6.0)),
                                                    ),
                                                    title: Text(
                                                      'Oops, something went wrong',
                                                      textAlign: TextAlign.center,
                                                      style: TextStyle(
                                                        color: candyApple,
                                                      ),
                                                    ),
                                                    content: Column(
                                                      mainAxisSize: MainAxisSize.min,
                                                      children: <Widget>[
                                                        Container(
                                                          margin: EdgeInsets.only(
                                                            top: 40,
                                                            bottom: 10,
                                                          ),
                                                          child: ButtonTheme(
                                                            height: 55,
                                                            padding: EdgeInsets.only(
                                                                top: 5,
                                                                right: 12,
                                                                bottom: 12,
                                                                left: 10
                                                            ),
                                                            child: RaisedButton(
                                                              shape: RoundedRectangleBorder(
                                                                borderRadius: BorderRadius.all(Radius.circular(6.0)),
                                                              ),
                                                              color: peacockBlue,
                                                              child: Text(
                                                                'OK',
                                                                style: TextStyle(
                                                                  height: textHeight,
                                                                  color: Colors.white,
                                                                  fontSize: 24,
                                                                ),
                                                              ),
                                                              onPressed: () async{
                                                                Navigator.of(context).pop();
                                                              }
                                                            ),
                                                          ),
                                                        ),
                                                      ],
                                                    ),
                                                  );
                                                }
                                              );
                                            }
                                          }
                                        ),
                                      ),
                                    ),
                                  ],
                                ),
                              );
                            }
                          );
                        }
                      }
                    ),
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  Future<void> loadNotes() async{
    String _notes = await dbHelper.queryNotes(widget.mapLocation);
    setState(() {
      _oldNotes = _notes;
      _textEditingController.text = _notes;
      _inputText = _notes;
    });
  }
}