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b5bdf4ec17
This PR is the second in a series of refactors that aim to simplify event handling in Flame. The approach is as follows:
Added the MultiTapDispatcher component, which contains the logic that used to be within the HasTappableComponents mixin. This component is internal; it mounts to a FlameGame directly, and ensures that it is a singleton.
Whenever any TapCallbacks component is added to a game, it automatically adds the MultiTapDispatcher component (unless there is already one), which in turn registers a tap gesture detector with GestureDetectorBuilder and rebuilds the game widget.
The end result is that now in order to make a component tappable you only need to add the TapCallbacks mixin to that component, everything else will be handled by the framework.
Consequently, the HasTappableComponents mixin is now empty and marked as deprecated.
82 lines
1.9 KiB
Dart
82 lines
1.9 KiB
Dart
import 'dart:ui';
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import 'package:flame/components.dart';
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import 'package:flame/game.dart';
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import 'package:flame/palette.dart';
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class ComposabilityExample extends FlameGame {
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static const String description = '''
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In this example we showcase how you can add children to a component and how
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they transform together with their parent, if the parent is a
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`PositionComponent`. This example is not interactive.
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''';
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late ParentSquare parentSquare;
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@override
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bool debugMode = true;
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@override
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Future<void> onLoad() async {
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parentSquare = ParentSquare(Vector2.all(200), Vector2.all(300))
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..anchor = Anchor.center;
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add(parentSquare);
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}
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@override
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void update(double dt) {
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super.update(dt);
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parentSquare.angle += dt;
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}
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}
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class ParentSquare extends RectangleComponent with HasGameRef {
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static final defaultPaint = BasicPalette.white.paint()
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..style = PaintingStyle.stroke;
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ParentSquare(Vector2 position, Vector2 size)
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: super(
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position: position,
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size: size,
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paint: defaultPaint,
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);
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@override
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Future<void> onLoad() async {
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createChildren();
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}
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void createChildren() {
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// All positions here are in relation to the parent's position
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const childSize = 50.0;
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final children = [
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RectangleComponent.square(
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position: Vector2(100, 100),
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size: childSize,
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angle: 2,
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paint: defaultPaint,
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),
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RectangleComponent.square(
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position: Vector2(160, 100),
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size: childSize,
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angle: 3,
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paint: defaultPaint,
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),
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RectangleComponent.square(
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position: Vector2(170, 150),
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size: childSize,
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angle: 4,
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paint: defaultPaint,
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),
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RectangleComponent.square(
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position: Vector2(70, 200),
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size: childSize,
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angle: 5,
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paint: defaultPaint,
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),
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];
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addAll(children);
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}
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}
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