Hi @sgehrman, Thanks for filing the issue. I am able to reproduce the issue the draggable item can be dragged with left, right and the center wheel as well reproducible on the latest stable and the master channel.

code sample

/// Flutter code sample for Draggable

// The following example has a [Draggable] widget along with a [DragTarget]
// in a row demonstrating an incremented `acceptedData` integer value when
// you drag the element to the target.

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

/// This is the main application widget.
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}

/// This is the stateful widget that the main application instantiates.
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

/// This is the private State class that goes with MyStatefulWidget.
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  int acceptedData = 0;

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: <Widget>[
        Draggable<int>(
          // Data is the value this Draggable stores.
          data: 10,
          child: Container(
            height: 100.0,
            width: 100.0,
            color: Colors.lightGreenAccent,
            child: const Center(
              child: Text('Draggable'),
            ),
          ),
          feedback: Container(
            color: Colors.deepOrange,
            height: 100,
            width: 100,
            child: const Icon(Icons.directions_run),
          ),
          childWhenDragging: Container(
            height: 100.0,
            width: 100.0,
            color: Colors.pinkAccent,
            child: const Center(
              child: Text('Child When Dragging'),
            ),
          ),
        ),
        DragTarget<int>(
          builder: (
            BuildContext context,
            List<dynamic> accepted,
            List<dynamic> rejected,
          ) {
            return Container(
              height: 100.0,
              width: 100.0,
              color: Colors.cyan,
              child: Center(
                child: Text('Value is updated to: $acceptedData'),
              ),
            );
          },
          onAccept: (int data) {
            setState(() {
              acceptedData += data;
            });
          },
        ),
      ],
    );
  }
}

flutter doctor -v

  [✓] Flutter (Channel stable, 2.5.0, on macOS 11.5.2 20G95 darwin-arm, locale en-GB)
    • Flutter version 2.5.0 at /Users/mahesh/Documents/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 4cc385b4b8 (6 days ago), 2021-09-07 23:01:49 -0700
    • Engine revision f0826da7ef
    • Dart version 2.14.0

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Users/mahesh/Library/Android/sdk
    • Platform android-31, build-tools 31.0.0
    • ANDROID_HOME = /Users/mahesh/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5.1, Build version 12E507
    • CocoaPods version 1.10.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.2)
    • 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 11.0.8+10-b944.6916264)

[✓] IntelliJ IDEA Community Edition (version 2021.2.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 60.1.4
    • Dart plugin version 212.5080.8

[✓] VS Code (version 1.59.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.26.0

[✓] Connected device (4 available)
    • Redmi K20 Pro (mobile)     • d9dac45d                             • android-arm64  •
      Android 11 (API 30)
    • iPhone 12 Pro Max (mobile) • 5430F628-A903-402C-A635-D55D7E6EEFCA • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)            • macos                                • darwin-arm64   • macOS
      11.5.2 20G95 darwin-arm
    • Chrome (web)               • chrome                               • web-javascript • Google
      Chrome 93.0.4577.63

• No issues found!

[✓] Flutter (Channel master, 2.6.0-1.0.pre.103, on macOS 11.5.2 20G95 darwin-arm, locale en-GB)
    • Flutter version 2.6.0-1.0.pre.103 at /Users/mahesh/Documents/flutter_master
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 2c30b252a5 (2 weeks ago), 2021-08-27 23:26:03 -0400
    • Engine revision ca52647cd2
    • Dart version 2.15.0 (build 2.15.0-65.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Users/mahesh/Library/Android/sdk
    • Platform android-31, build-tools 31.0.0
    • ANDROID_HOME = /Users/mahesh/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.5.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.10.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.2)
    • 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 11.0.8+10-b944.6916264)

[✓] IntelliJ IDEA Community Edition (version 2021.2.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 60.1.4
    • Dart plugin version 212.5080.8

[✓] VS Code (version 1.59.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.26.0

[✓] Connected device (4 available)
    • Redmi K20 Pro (mobile)     • d9dac45d                             • android-arm64  • Android 11 (API 30)
    • iPhone 12 Pro Max (mobile) • 5430F628-A903-402C-A635-D55D7E6EEFCA • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)            • macos                                • darwin-arm64   • macOS 11.5.2 20G95
      darwin-arm
    • Chrome (web)               • chrome                               • web-javascript • Google Chrome
      93.0.4577.63

• No issues found!

Code sample taken from docs.

Also, I couldn't find any docs specifying how to configure mouse events.

Edited: This is also applicable for LongPressDraggable

Draggable drags on left, right and middle mouse buttons. I just want left button #89962

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