blob: 361988e7ff90b09d30f584353186fe81df62af0b [file] [log] [blame]
// 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.
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
// Sets a platform override for desktop to avoid exceptions. See
// https://flutter.dev/desktop#target-platform-override for more info.
// TODO(gspencergoog): Remove once TargetPlatform includes all desktop platforms.
void _enablePlatformOverrideForDesktop() {
if (!kIsWeb && (Platform.isWindows || Platform.isLinux)) {
debugDefaultTargetPlatformOverride = TargetPlatform.fuchsia;
}
}
void main() {
_enablePlatformOverrideForDesktop();
runApp(const MaterialApp(
title: 'Focus Demo',
home: FocusDemo(),
));
}
class DemoButton extends StatefulWidget {
const DemoButton({this.name, this.canRequestFocus = true, this.autofocus = false});
final String name;
final bool canRequestFocus;
final bool autofocus;
@override
_DemoButtonState createState() => _DemoButtonState();
}
class _DemoButtonState extends State<DemoButton> {
FocusNode focusNode;
@override
void initState() {
super.initState();
focusNode = FocusNode(
debugLabel: widget.name,
canRequestFocus: widget.canRequestFocus,
);
}
@override
void dispose() {
focusNode?.dispose();
super.dispose();
}
@override
void didUpdateWidget(DemoButton oldWidget) {
super.didUpdateWidget(oldWidget);
focusNode.canRequestFocus = widget.canRequestFocus;
}
void _handleOnPressed() {
focusNode.requestFocus();
print('Button ${widget.name} pressed.');
debugDumpFocusTree();
}
@override
Widget build(BuildContext context) {
return FlatButton(
focusNode: focusNode,
autofocus: widget.autofocus,
focusColor: Colors.red,
hoverColor: Colors.blue,
onPressed: () => _handleOnPressed(),
child: Text(widget.name),
);
}
}
class FocusDemo extends StatefulWidget {
const FocusDemo({Key key}) : super(key: key);
@override
_FocusDemoState createState() => _FocusDemoState();
}
class _FocusDemoState extends State<FocusDemo> {
FocusNode outlineFocus;
@override
void initState() {
super.initState();
outlineFocus = FocusNode(debugLabel: 'Demo Focus Node');
}
@override
void dispose() {
outlineFocus.dispose();
super.dispose();
}
bool _handleKeyPress(FocusNode node, RawKeyEvent event) {
if (event is RawKeyDownEvent) {
print('Scope got key event: ${event.logicalKey}, $node');
print('Keys down: ${RawKeyboard.instance.keysPressed}');
if (event.logicalKey == LogicalKeyboardKey.tab) {
debugDumpFocusTree();
if (event.isShiftPressed) {
print('Moving to previous.');
node.previousFocus();
return true;
} else {
print('Moving to next.');
node.nextFocus();
return true;
}
}
if (event.logicalKey == LogicalKeyboardKey.arrowLeft) {
node.focusInDirection(TraversalDirection.left);
return true;
}
if (event.logicalKey == LogicalKeyboardKey.arrowRight) {
node.focusInDirection(TraversalDirection.right);
return true;
}
if (event.logicalKey == LogicalKeyboardKey.arrowUp) {
node.focusInDirection(TraversalDirection.up);
return true;
}
if (event.logicalKey == LogicalKeyboardKey.arrowDown) {
node.focusInDirection(TraversalDirection.down);
return true;
}
}
return false;
}
@override
Widget build(BuildContext context) {
final TextTheme textTheme = Theme.of(context).textTheme;
return DefaultFocusTraversal(
policy: ReadingOrderTraversalPolicy(),
child: FocusScope(
debugLabel: 'Scope',
onKey: _handleKeyPress,
autofocus: true,
child: DefaultTextStyle(
style: textTheme.headline4,
child: Scaffold(
appBar: AppBar(
title: const Text('Focus Demo'),
),
floatingActionButton: FloatingActionButton(
child: const Text('+'),
onPressed: () {},
),
body: Center(
child: Builder(builder: (BuildContext context) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const <Widget>[
DemoButton(
name: 'One',
autofocus: true,
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const <Widget>[
DemoButton(name: 'Two'),
DemoButton(
name: 'Three',
canRequestFocus: false,
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const <Widget>[
DemoButton(name: 'Four'),
DemoButton(name: 'Five'),
DemoButton(name: 'Six'),
],
),
OutlineButton(onPressed: () => print('pressed'), child: const Text('PRESS ME')),
const Padding(
padding: EdgeInsets.all(8.0),
child: TextField(
decoration: InputDecoration(labelText: 'Enter Text', filled: true),
),
),
const Padding(
padding: EdgeInsets.all(8.0),
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Enter Text',
filled: false,
),
),
),
],
);
}),
),
),
),
),
);
}
}