GitJournal/lib/note_editor.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:journal/note.dart';
import 'package:journal/state_container.dart';

class NoteEditor extends StatefulWidget {
  final Note note;

  NoteEditor() : note = null;
  NoteEditor.fromNote(this.note);

  @override
  NoteEditorState createState() {
    if (note == null) {
      return new NoteEditorState();
    } else {
      return new NoteEditorState.fromNote(note);
    }
  }
}

class NoteEditorState extends State<NoteEditor> {
  Note note = new Note();
  final bool newNote;
  TextEditingController _textController = new TextEditingController();

  NoteEditorState() : newNote = true {
    note.created = new DateTime.now();
  }

  NoteEditorState.fromNote(Note n) : newNote = false {
    note = n;
    _textController = new TextEditingController(text: note.body);
  }

  @override
  Widget build(BuildContext context) {
    var bodyWidget = new Container(
      child: new Form(
        // Show a dialog if discarding non-empty notes
        onWillPop: () {
          return Future(() {
            var noteContent = _textController.text.trim();
            if (noteContent.isEmpty) {
              return true;
            }
            return showDialog(
              context: context,
              builder: _buildAlertDialog,
            );
          });
        },
        child: TextFormField(
          autofocus: true,
          keyboardType: TextInputType.multiline,
          maxLines: 5000,
          decoration: new InputDecoration(
            hintText: 'Write here',
          ),
          controller: _textController,
        ),
      ),
      padding: const EdgeInsets.all(8.0),
    );

    var title = newNote ? "New Journal Entry" : "Edit Journal Entry";
    var newJournalScreen = new Scaffold(
      appBar: new AppBar(
        title: new Text(title),
      ),
      body: bodyWidget,
      floatingActionButton: FloatingActionButton(
          child: Icon(Icons.check),
          onPressed: () {
            final stateContainer = StateContainer.of(context);
            this.note.body = _textController.text;

            newNote
                ? stateContainer.addNote(note)
                : stateContainer.updateNote(note);
            Navigator.pop(context);
          }),
    );

    return newJournalScreen;
  }

  Widget _buildAlertDialog(BuildContext context) {
    return new AlertDialog(
      // FIXME: Change this to 'Save' vs 'Discard'
      title: new Text('Are you sure?'),
      content: new Text('Do you want to discard the entry'),
      actions: <Widget>[
        new FlatButton(
          onPressed: () => Navigator.of(context).pop(false),
          child: new Text('No'),
        ),
        new FlatButton(
          onPressed: () => Navigator.of(context).pop(true),
          child: new Text('Yes'),
        ),
      ],
    );
  }
}