flame/examples/lib/stories/input/tappables.dart

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

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

  bool _beenPressed = false;

  TappableSquare({Vector2? position})
      : super(
          position: position ?? Vector2.all(100),
          size: Vector2.all(100),
        );

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

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

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

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

class TappablesGame extends BaseGame with HasTappableComponents {
  @override
  Future<void> onLoad() async {
    add(TappableSquare()..anchor = Anchor.center);
    add(TappableSquare()..y = 350);
  }
}