1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/// Flutter code sample for [CheckboxMenuButton].
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(const MenuApp());
class MyCheckboxMenu extends StatefulWidget {
const MyCheckboxMenu({super.key, required this.message});
final String message;
@override
State<MyCheckboxMenu> createState() => _MyCheckboxMenuState();
}
class _MyCheckboxMenuState extends State<MyCheckboxMenu> {
final FocusNode _buttonFocusNode = FocusNode(debugLabel: 'Menu Button');
static const SingleActivator _showShortcut = SingleActivator(LogicalKeyboardKey.keyS, control: true);
bool _showingMessage = false;
@override
void dispose() {
_buttonFocusNode.dispose();
super.dispose();
}
void _setMessageVisibility(bool visible) {
setState(() {
_showingMessage = visible;
});
}
@override
Widget build(BuildContext context) {
return CallbackShortcuts(
bindings: <ShortcutActivator, VoidCallback>{
_showShortcut: () {
_setMessageVisibility(!_showingMessage);
},
},
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
MenuAnchor(
childFocusNode: _buttonFocusNode,
menuChildren: <Widget>[
CheckboxMenuButton(
value: _showingMessage,
onChanged: (bool? value) {
_setMessageVisibility(value!);
},
child: const Text('Show Message'),
),
],
builder: (BuildContext context, MenuController controller, Widget? child) {
return TextButton(
focusNode: _buttonFocusNode,
onPressed: () {
if (controller.isOpen) {
controller.close();
} else {
controller.open();
}
},
child: const Text('OPEN MENU'),
);
},
),
Expanded(
child: Container(
alignment: Alignment.center,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.all(12.0),
child: Text(
_showingMessage ? widget.message : '',
style: Theme.of(context).textTheme.headlineSmall,
),
),
],
),
),
),
],
),
);
}
}
class MenuApp extends StatelessWidget {
const MenuApp({super.key});
static const String kMessage = '"Talk less. Smile more." - A. Burr';
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: Scaffold(body: MyCheckboxMenu(message: kMessage)),
);
}
}