| // 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 'package:flutter/gestures.dart'; |
| |
| import 'package:flutter/material.dart'; |
| |
| /// Flutter code sample for [PointerSignalResolver]. |
| |
| void main() => runApp(const PointerSignalResolverExampleApp()); |
| |
| class PointerSignalResolverExampleApp extends StatelessWidget { |
| const PointerSignalResolverExampleApp({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return const MaterialApp( |
| home: PointerSignalResolverExample(), |
| ); |
| } |
| } |
| |
| class ColorChanger extends StatefulWidget { |
| const ColorChanger({ |
| super.key, |
| required this.initialColor, |
| required this.useResolver, |
| this.child, |
| }); |
| |
| final HSVColor initialColor; |
| final bool useResolver; |
| final Widget? child; |
| |
| @override |
| State<ColorChanger> createState() => _ColorChangerState(); |
| } |
| |
| class _ColorChangerState extends State<ColorChanger> { |
| late HSVColor color; |
| |
| void rotateColor() { |
| setState(() { |
| color = color.withHue((color.hue + 3) % 360.0); |
| }); |
| } |
| |
| @override |
| void initState() { |
| super.initState(); |
| color = widget.initialColor; |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return DecoratedBox( |
| decoration: BoxDecoration( |
| border: const Border.fromBorderSide(BorderSide()), |
| color: color.toColor(), |
| ), |
| child: Listener( |
| onPointerSignal: (PointerSignalEvent event) { |
| if (widget.useResolver) { |
| GestureBinding.instance.pointerSignalResolver.register(event, (PointerSignalEvent event) { |
| rotateColor(); |
| }); |
| } else { |
| rotateColor(); |
| } |
| }, |
| child: Stack( |
| fit: StackFit.expand, |
| children: <Widget>[ |
| const AbsorbPointer(), |
| if (widget.child != null) widget.child!, |
| ], |
| ), |
| ), |
| ); |
| } |
| } |
| |
| class PointerSignalResolverExample extends StatefulWidget { |
| const PointerSignalResolverExample({super.key}); |
| |
| @override |
| State<PointerSignalResolverExample> createState() => _PointerSignalResolverExampleState(); |
| } |
| |
| class _PointerSignalResolverExampleState extends State<PointerSignalResolverExample> { |
| bool useResolver = false; |
| |
| @override |
| Widget build(BuildContext context) { |
| return Material( |
| child: Stack( |
| fit: StackFit.expand, |
| children: <Widget>[ |
| ColorChanger( |
| initialColor: const HSVColor.fromAHSV(0.2, 120.0, 1, 1), |
| useResolver: useResolver, |
| child: FractionallySizedBox( |
| widthFactor: 0.5, |
| heightFactor: 0.5, |
| child: ColorChanger( |
| initialColor: const HSVColor.fromAHSV(1, 60.0, 1, 1), |
| useResolver: useResolver, |
| ), |
| ), |
| ), |
| Align( |
| alignment: Alignment.topLeft, |
| child: Row( |
| children: <Widget>[ |
| Switch( |
| value: useResolver, |
| onChanged: (bool value) { |
| setState(() { |
| useResolver = value; |
| }); |
| }, |
| ), |
| const Text( |
| 'Use the PointerSignalResolver?', |
| style: TextStyle(fontWeight: FontWeight.bold), |
| ), |
| ], |
| ), |
| ), |
| ], |
| ), |
| ); |
| } |
| } |