flame/doc/examples/gestures/lib/main_tapables.dart

import 'package:flame/components.dart';
import 'package:flutter/material.dart';
import 'package:flame/game.dart';
import 'package:flame/extensions.dart';

void main() {
  runApp(
    Container(
      padding: const EdgeInsets.all(50),
      color: const Color(0xFFA9A9A9),
      child: GameWidget(
        game: MyGame(),
      ),
    ),
  );
}

class TapableSquare extends PositionComponent with Tapable {
  static final Paint _white = Paint()..color = const Color(0xFFFFFFFF);
  static final Paint _grey = Paint()..color = const Color(0xFFA5A5A5);

  bool _beenPressed = false;

  TapableSquare({Vector2 position}) {
    size = Vector2.all(100);
    this.position = position ?? Vector2.all(100);
  }

  @override
  void render(Canvas canvas) {
    super.render(canvas);
    canvas.drawRect(size.toRect(), _beenPressed ? _grey : _white);
  }

  @override
  bool onTapUp(TapUpDetails details) {
    _beenPressed = false;
    return true;
  }

  @override
  bool onTapDown(TapDownDetails details) {
    _beenPressed = true;
    angle += 1.0;
    return true;
  }

  @override
  bool onTapCancel() {
    _beenPressed = false;
    return true;
  }
}

class MyGame extends BaseGame with HasTapableComponents {
  MyGame() {
    add(TapableSquare()..anchor = Anchor.center);
    add(TapableSquare()..y = 350);
  }
}