onPointerCancel of Listener in never called #93683
Description
Steps to Reproduce
- Execute
flutter runon the code sample - Tap down (but don't release) the amber square and move outside of the square and then release
- Pointer down event and pointer up event is sent, but pointer cancel should be sent.
- There seems to be no way to generate pointer cancel events, and either docs is wrong, or a bug exists
Expected results:
A pointer cancel event is sent when the input from a pointer that triggered an [onPointerDown] is no longer directed towards this receiver (as per what the docs suggest would happen).
Actual results:
No pointer cancel event is sent at all... and instead a pointer up event sent when the receiver should no longer be receiving events !?
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: ListenerTest(),
);
}
}
class ListenerTest extends StatefulWidget {
const ListenerTest({Key? key}) : super(key: key);
@override
State<ListenerTest> createState() => _ListenerTestState();
}
class _ListenerTestState extends State<ListenerTest> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Listener Test'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Listener(
onPointerDown: (pde) => debugPrint("$pde"),
onPointerUp: (pue) => debugPrint("$pue"),
onPointerCancel: (pce) => debugPrint("$pce"),
child: Container(
width: 100,
height: 60,
color: Colors.amber,
child: const Text(
'ClickMe',
))),
],
),
),
);
}
}
Logs
[✓] Flutter (Channel stable, 2.5.3, on macOS 11.6 20G165 darwin-x64, locale en-AU)
• Flutter version 2.5.3 at /Users/gslender/Documents/Development/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 18116933e7 (4 weeks ago), 2021-10-15 10:46:35 -0700
• Engine revision d3ea636dc5
• Dart version 2.14.4
[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at /Users/gslender/Library/Android/sdk
• Platform android-31, build-tools 31.0.0
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 13.1, Build version 13A1030d
• CocoaPods version 1.11.0
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2020.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)
[✓] VS Code (version 1.62.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.28.0
[✓] Connected device (2 available)
• macOS (desktop) • macos • darwin-x64 • macOS 11.6 20G165 darwin-x64
• Chrome (web) • chrome • web-javascript • Google Chrome 95.0.4638.69
• No issues found!