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// 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 [PointerSignalResolver].
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
static const String _title = 'Flutter Code Sample';
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: _title,
home: MyStatefulWidget(),
);
}
}
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 MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({super.key});
@override
State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
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),
),
],
),
),
],
),
);
}
}