flutter_sdl_gamepad 1.1.1

A Flutter wrapper to compile all the native assets needed for package:sdl_gamepad, an SDL-based gamepad library

example/lib/main.dart

import "dart:async";

import "package:flutter_sdl_gamepad/flutter_sdl_gamepad.dart";
import "package:flutter/material.dart";

void main() => runApp(const MaterialApp(home: GamepadPage()));

class GamepadPage extends StatefulWidget {
  const GamepadPage({super.key});

  @override
  GamepadPageState createState() => GamepadPageState();
}

class GamepadPageState extends State<GamepadPage> {
  Timer? timer;
  String? error;
  SdlGamepad? gamepad;
  GamepadState? state;

  final gamepadInfo = <int, String>{};

  bool get hasError => error != null;

  @override
  void initState() {
    super.initState();
    if (!SdlLibrary.init()) {
      error = "Could not initialize SDL: ${SdlLibrary.getError()}";
      SdlLibrary.dispose();
      return;
    }
    checkGamepads();
    timer = Timer.periodic(const Duration(milliseconds: 100), refreshState);
  }

  @override
  void dispose() {
    timer?.cancel();
    super.dispose();
  }

  void checkGamepads() {
    setState(() => error = null);
    gamepadInfo.clear();
    final gamepads = SdlGamepad.getConnectedGamepadIds();
    for (final gamepadId in gamepads) {
      final info = SdlGamepad.getInfoForGamepadId(gamepadId);
      final message = "  Name: ${info.name}\n"
          "  Gamepad type: ${info.type}\n";
      gamepadInfo[gamepadId] = message;
    }
    setState(() {});
  }

  void refreshState(_) {
    if (gamepad == null) return;
    setState(() => state = gamepad!.getState());
  }

  void selectGamepad(int gamepadId) {
    setState(() => error = null);
    setState(() => gamepad = SdlGamepad.fromGamepadIndex(gamepadId));
    if (!gamepad!.isConnected) {
      gamepad = null;
      setState(() => error = "That gamepad is not connected");
    }
  }

  @override
  Widget build(BuildContext context) => Scaffold(
        body: Row(
          children: [
            Expanded(
              child: Column(
                // list of gamepads
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  if (error != null)
                    Text(error!, style: const TextStyle(color: Colors.red)),
                  const SizedBox(height: 12),
                  FilledButton.icon(
                    label: const Text("Refresh"),
                    icon: const Icon(Icons.refresh),
                    onPressed: checkGamepads,
                  ),
                  const SizedBox(height: 12),
                  if (gamepadInfo.isEmpty)
                    const Text("There are no gamepads connected"),
                  for (final entry in gamepadInfo.entries)
                    ListTile(
                      title: Text("Gamepad: ${entry.key}"),
                      subtitle: Text(entry.value),
                      onTap: () => selectGamepad(entry.key),
                    ),
                ],
              ),
            ),
            if (state == null)
              const Expanded(
                child: Text("Choose a gamepad"),
              )
            else ...[
              Expanded(
                child: Thumbstick(
                  label: "Left joystick",
                  x: state!.normalLeftJoystickX,
                  y: state!.normalLeftJoystickY,
                ),
              ),
              Expanded(
                child: Thumbstick(
                  label: "Right joystick",
                  x: state!.normalRightJoystickX,
                  y: state!.normalRightJoystickY,
                ),
              ),
            ],
          ],
        ),
      );
}

class Thumbstick extends StatelessWidget {
  final double x;
  final double y;
  final String label;
  const Thumbstick({
    required this.x,
    required this.y,
    required this.label,
    super.key,
  });

  @override
  Widget build(BuildContext context) => Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Text(
            label,
            style: Theme.of(context).textTheme.headlineSmall,
          ),
          const SizedBox(height: 12),
          Container(
            width: 50,
            height: 50,
            decoration: const ShapeDecoration(
              shape: CircleBorder(
                side: BorderSide(color: Colors.black),
              ),
            ),
            child: Align(
              alignment: Alignment(x, y),
              child: const SizedBox(
                width: 25,
                height: 25,
                child: DecoratedBox(
                  decoration: ShapeDecoration(
                    shape: CircleBorder(),
                    color: Colors.blue,
                  ),
                ),
              ),
            ),
          ),
        ],
      );
}