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You need deep copy and immutable object #190

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You need deep copy and immutable object #190

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93 changes: 56 additions & 37 deletions change_notifier_provider/lib/home/todo_list_view.dart
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -22,47 +22,66 @@ class TodoListView extends StatelessWidget {
itemBuilder: (context, index) {
final todo = todos[index];

return Dismissible(
key: ArchSampleKeys.todoItem(todo.id),
onDismissed: (_) => onRemove(context, todo),
child: ListTile(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (_) {
return DetailsScreen(
id: todo?.id,
onRemove: () {
Navigator.pop(context);
onRemove(context, todo);
return Column(
mainAxisSize: MainAxisSize.min,
children: [
Dismissible(
key: ArchSampleKeys.todoItem(todo.id),
onDismissed: (_) => onRemove(context, todo),
child: ListTile(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (_) {
return DetailsScreen(
id: todo?.id,
onRemove: () {
Navigator.pop(context);
onRemove(context, todo);
},
);
},
);
),
);
},
leading: Checkbox(
key: ArchSampleKeys.todoItemCheckbox(todo.id),
value: todo.complete,
onChanged: (complete) {
Provider.of<TodoListModel>(context, listen: false)
.updateTodo(todo.copy(complete: complete));
},
),
);
},
leading: Checkbox(
key: ArchSampleKeys.todoItemCheckbox(todo.id),
value: todo.complete,
onChanged: (complete) {
Provider.of<TodoListModel>(context, listen: false)
.updateTodo(todo.copy(complete: complete));
},
),
title: Text(
todo.task,
key: ArchSampleKeys.todoItemTask(todo.id),
style: Theme.of(context).textTheme.title,
),
subtitle: Text(
todo.note,
key: ArchSampleKeys.todoItemNote(todo.id),
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: Theme.of(context).textTheme.subhead,
title: Text(
todo.task,
key: ArchSampleKeys.todoItemTask(todo.id),
style: Theme.of(context).textTheme.title,
),
subtitle: Text(
todo.note,
key: ArchSampleKeys.todoItemNote(todo.id),
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: Theme.of(context).textTheme.subhead,
),
),
),
),
for(final person in todo.assignInfo.person)
ListTile(
title: Text('Person $person'),
trailing: IconButton(
icon: Icon(Icons.delete_forever),
onPressed: () {
Provider.of<TodoListModel>(context, listen: false)
.updateTodo(todo.copy(assignInfo: todo.assignInfo.copy(person: todo.assignInfo.person..remove(person))));
/// CORRECT WAY
// Provider.of<TodoListModel>(context, listen: false)
// .updateTodo(todo.copy(assignInfo: todo.assignInfo.copy(person: List.of(todo.assignInfo.person)..remove(person))));
},
),
)
],
);
},
);
Expand Down
29 changes: 24 additions & 5 deletions change_notifier_provider/lib/models.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -14,27 +14,30 @@ class Todo {
final String id;
final String note;
final String task;
final AssignInfo assignInfo;

Todo(this.task, {this.complete = false, this.note = '', String id})
: id = id ?? Uuid().generateV4();
Todo(this.task, {this.complete = false, this.note = '', String id, AssignInfo assignInfo})
: id = id ?? Uuid().generateV4(),
assignInfo = assignInfo ?? AssignInfo(Person.values);

@override
int get hashCode =>
complete.hashCode ^ task.hashCode ^ note.hashCode ^ id.hashCode;
complete.hashCode ^ task.hashCode ^ note.hashCode ^ assignInfo.hashCode ^ id.hashCode;

@override
bool operator ==(Object other) =>
identical(this, other) ||
other is Todo &&
runtimeType == other.runtimeType &&
complete == other.complete &&
assignInfo == other.assignInfo &&
task == other.task &&
note == other.note &&
id == other.id;

@override
String toString() {
return 'Todo{complete: $complete, task: $task, note: $note, id: $id}';
return 'Todo{complete: $complete, task: $task, note: $note, assignInfo: $assignInfo, id: $id}';
}

TodoEntity toEntity() {
Expand All @@ -50,12 +53,28 @@ class Todo {
);
}

Todo copy({String task, bool complete, String note, String id}) {
Todo copy({String task, bool complete, String note, String id, AssignInfo assignInfo}) {
return Todo(
task ?? this.task,
complete: complete ?? this.complete,
note: note ?? this.note,
assignInfo: assignInfo?.copy() ?? this.assignInfo?.copy(),
id: id ?? this.id,
);
}
}

class AssignInfo {
final List<Person> person;

AssignInfo(this.person);

AssignInfo copy({List<Person> person}) {
final newPerson = person ?? this.person;
return AssignInfo(newPerson != null ? List.of(newPerson) : null);
}
}

enum Person {
sasha, masha, dasha
}