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96 lines
3.0 KiB
96 lines
3.0 KiB
import 'package:flame/components.dart';
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import 'package:flame_forge2d/flame_forge2d.dart';
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import 'package:flutter/material.dart';
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import 'package:pinball_flame/pinball_flame.dart';
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/// Appends a new [ContactCallbacks] to the parent.
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///
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/// This is a convenience class for adding a [ContactCallbacks] to the parent.
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/// In constract with just adding a [ContactCallbacks] to the parent's body
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/// userData, this class respects the previous [ContactCallbacks] in the
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/// parent's body userData, if any. Hence, it avoids overriding any previous
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/// [ContactCallbacks] in the parent.
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///
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/// It does so by grouping the [ContactCallbacks] in a [_ContactCallbacksGroup],
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/// and resetting the parent's userData accordingly.
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// TODO(alestiago): Make use of generics to infer the type of the contact.
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// https://github.com/VGVentures/pinball/pull/234#discussion_r859182267
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// TODO(alestiago): Consider if there is a need to support adjusting a fixture's
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// userData.
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class ContactBehavior<T extends BodyComponent> extends Component
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with ContactCallbacks, ParentIsA<T> {
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@override
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@mustCallSuper
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Future<void> onLoad() async {
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final userData = parent.body.userData;
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if (userData is _ContactCallbacksGroup) {
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userData.addContactCallbacks(this);
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} else if (userData is ContactCallbacks) {
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final contactCallbacksGroup = _ContactCallbacksGroup()
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..addContactCallbacks(userData)
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..addContactCallbacks(this);
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parent.body.userData = contactCallbacksGroup;
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} else {
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parent.body.userData = this;
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}
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}
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}
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class _ContactCallbacksGroup implements ContactCallbacks {
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final List<ContactCallbacks> _contactCallbacks = [];
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@override
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@mustCallSuper
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void beginContact(Object other, Contact contact) {
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onBeginContact?.call(other, contact);
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for (final callback in _contactCallbacks) {
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callback.beginContact(other, contact);
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}
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}
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@override
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@mustCallSuper
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void endContact(Object other, Contact contact) {
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onEndContact?.call(other, contact);
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for (final callback in _contactCallbacks) {
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callback.endContact(other, contact);
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}
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}
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@override
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@mustCallSuper
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void preSolve(Object other, Contact contact, Manifold oldManifold) {
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onPreSolve?.call(other, contact, oldManifold);
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for (final callback in _contactCallbacks) {
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callback.preSolve(other, contact, oldManifold);
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}
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}
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@override
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@mustCallSuper
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void postSolve(Object other, Contact contact, ContactImpulse impulse) {
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onPostSolve?.call(other, contact, impulse);
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for (final callback in _contactCallbacks) {
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callback.postSolve(other, contact, impulse);
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}
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}
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void addContactCallbacks(ContactCallbacks callback) {
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_contactCallbacks.add(callback);
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}
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@override
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void Function(Object other, Contact contact)? onBeginContact;
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@override
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void Function(Object other, Contact contact)? onEndContact;
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@override
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void Function(Object other, Contact contact, ContactImpulse impulse)?
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onPostSolve;
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@override
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void Function(Object other, Contact contact, Manifold oldManifold)?
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onPreSolve;
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}
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