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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| import 'package:hive/hive.dart'; | ||
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| // Generated by `flutter packages pub run build_runner build`. | ||
| part 'todo_item.g.dart'; | ||
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| @HiveType() | ||
| class TodoItem extends HiveObject { | ||
| @HiveField(0) | ||
| int id; | ||
| @HiveField(1) | ||
| String content; | ||
| @HiveField(2) | ||
| bool isDone; | ||
| @HiveField(3) | ||
| final DateTime createdAt; | ||
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| TodoItem({this.id, this.content, this.isDone = false, createdAt}) | ||
| : this.createdAt = createdAt ?? DateTime.now(); | ||
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| @override | ||
| String toString() { | ||
| return 'TodoItem(id=$id, content=$content, idDone=$isDone, createdAt=$createdAt)'; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| import 'package:english_words/english_words.dart' as english_words; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:hive/hive.dart'; | ||
| import 'package:hive_flutter/hive_flutter.dart'; | ||
| import 'package:path/path.dart'; | ||
| import 'package:path_provider/path_provider.dart' as path_provider; | ||
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| import './data/todo_item.dart' show TodoItem, TodoItemAdapter; | ||
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| // We use built_value and hive_generator to make serializable data class. | ||
| /* Content of the "./data/todo_item.dart" file: | ||
| import 'package:hive/hive.dart'; | ||
| // Generated by `flutter packages pub run build_runner build`. | ||
| part 'todo_item.g.dart'; | ||
| @HiveType() | ||
| class TodoItem extends HiveObject { | ||
| @HiveField(0) | ||
| int id; | ||
| @HiveField(1) | ||
| String content; | ||
| @HiveField(2) | ||
| bool isDone; | ||
| @HiveField(3) | ||
| final DateTime createdAt; | ||
| TodoItem({this.id, this.content, this.isDone = false, createdAt}) | ||
| : this.createdAt = createdAt ?? DateTime.now(); | ||
| @override | ||
| String toString() { | ||
| return 'TodoItem(id=$id, content=$content, idDone=$isDone, createdAt=$createdAt)'; | ||
| } | ||
| } */ | ||
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| class HiveExample extends StatefulWidget { | ||
| const HiveExample({Key key}) : super(key: key); | ||
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| @override | ||
| _HiveExampleState createState() => _HiveExampleState(); | ||
| } | ||
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| class _HiveExampleState extends State<HiveExample> { | ||
| static const kHiveFolder = 'hive'; | ||
| static const kHiveBoxName = 'todosBox'; | ||
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| Future<bool> _initDbFuture; | ||
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| @override | ||
| void initState() { | ||
| super.initState(); | ||
| this._initDbFuture = this._initDb(); | ||
| } | ||
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| // Initializes the hive DB, once done the hive operations are *synchronous*. | ||
| Future<bool> _initDb() async { | ||
| // Initialize hive. | ||
| final hiveFolder = join( | ||
| (await path_provider.getApplicationDocumentsDirectory()).path, | ||
| kHiveFolder); | ||
| Hive.init(hiveFolder); | ||
| Hive.registerAdapter(TodoItemAdapter(), 0); | ||
| // Open the hive box so that we can later call Hive.box(<name>) to use it. | ||
| await Hive.openBox<TodoItem>(kHiveBoxName); | ||
| final List<TodoItem> todos = _getTodoItems(); | ||
| print('Hive initialization done, todo items in the db are:'); | ||
| for (final todo in todos) { | ||
| print(todo); | ||
| } | ||
| return true; | ||
| } | ||
|
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| // Retrieves records from the hive box. | ||
| List<TodoItem> _getTodoItems() { | ||
| final box = Hive.box<TodoItem>(kHiveBoxName); | ||
| return box.values.toList(); | ||
| } | ||
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| // Inserts records to hive. | ||
| // Note we don't need to explicitly set the primary key (id), it'll auto | ||
| // increment. | ||
| Future<void> _addTodoItem(TodoItem todo) async { | ||
| final box = Hive.box<TodoItem>(kHiveBoxName); | ||
| int key = await box.add(todo); | ||
| // Set the id field to the auto-incremented key. | ||
| todo.id = key; | ||
| await todo.save(); | ||
| print('Inserted: key=$key, value=$todo'); | ||
| } | ||
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| // Updates records in the db table. | ||
| Future<void> _toggleTodoItem(TodoItem todo) async { | ||
| // Since class TodoItem extends HiveObject, update the record is very easy. | ||
| // Note the `todo` must already been added to the hive box. | ||
| todo.isDone = !todo.isDone; | ||
| await todo.save(); | ||
| print('Updated: key=${todo.id}, value=$todo'); | ||
| } | ||
|
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| // Deletes records in the db table. | ||
| Future<void> _deleteTodoItem(TodoItem todo) async { | ||
| // Since class TodoItem extends HiveObject, delete the object is very easy. | ||
| // Note the `todo` must already been added to the hive box. | ||
| await todo.delete(); | ||
| print('Delted: key=${todo.id}, value=$todo'); | ||
| } | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return FutureBuilder<bool>( | ||
| future: this._initDbFuture, | ||
| builder: (context, snapshot) { | ||
| if (!snapshot.hasData) | ||
| return Center( | ||
| child: CircularProgressIndicator(), | ||
| ); | ||
| return Scaffold( | ||
| // WatchBoxBuilder by hive_flutter can save us from writing a | ||
| // StreamBuilder ourselves. | ||
| body: WatchBoxBuilder( | ||
| box: Hive.box<TodoItem>(kHiveBoxName), | ||
| builder: (BuildContext context, Box box) => ListView( | ||
| children: <Widget>[ | ||
| for (int i = 0; i < box.length; ++i) | ||
| _itemToListTile(box.getAt(i)) | ||
| ], | ||
| ), | ||
| ), | ||
| floatingActionButton: _buildFloatingActionButton(), | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
|
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| ListTile _itemToListTile(TodoItem todo) => ListTile( | ||
| title: Text( | ||
| todo.content, | ||
| style: TextStyle( | ||
| fontStyle: todo.isDone ? FontStyle.italic : null, | ||
| color: todo.isDone ? Colors.grey : null, | ||
| decoration: todo.isDone ? TextDecoration.lineThrough : null), | ||
| ), | ||
| subtitle: Text('id=${todo.id}\ncreated at ${todo.createdAt}'), | ||
| isThreeLine: true, | ||
| leading: IconButton( | ||
| icon: Icon( | ||
| todo.isDone ? Icons.check_box : Icons.check_box_outline_blank), | ||
| onPressed: () => _toggleTodoItem(todo), | ||
| ), | ||
| trailing: IconButton( | ||
| icon: Icon(Icons.delete), | ||
| onPressed: () => _deleteTodoItem(todo), | ||
| ), | ||
| ); | ||
|
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| FloatingActionButton _buildFloatingActionButton() { | ||
| return FloatingActionButton( | ||
| child: Icon(Icons.add), | ||
| onPressed: () async { | ||
| await _addTodoItem( | ||
| TodoItem( | ||
| content: english_words.generateWordPairs().first.asPascalCase, | ||
| ), | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
| } |
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