Also send events to the top body in a multipart body

[getkey]

When the body is multipart, the event didn't get sent to the top body.

[TomYeoman]

Nice PR this helped me!

You need to call all handlers (your code only handles onCollide, but not end)

const Matter = require("matter-js");

const MatterCollisionEvents = {
  name: "matter-collision-events",
  version: "0.1.5",
  for: "matter-js@^0.12.0",
  install: function(matter) {
    // add the onCollide, onCollideEnd, and onCollideActive callback handlers
    // to the native Matter.Body created

    function triggerRecursively(body, eventName, pair) {
      matter.Events.trigger(body, eventName, { pair: pair });

      if (eventName === "onCollide") {
        body._mceOC &&
          body._mceOC(pair);
      }

      if (eventName === "onCollideActive") {
        body._mceOCA &&
          body._mceOCA(pair);
      }

      if (eventName === "onCollideEnd") {
        body._mceOCE &&
          body._mceOCE(pair);
      }

      if (body.parent !== undefined && body.parent !== body) {
        triggerRecursively(body.parent, eventName, pair);
	  }
    }

    function sendEvent(pair, eventName) {
      triggerRecursively(pair.bodyA, eventName, pair);
      triggerRecursively(pair.bodyB, eventName, pair);
    }

    var create = matter.Body.create;
    matter.Body.create = function() {
      var body = create.apply(null, arguments);
      body.onCollide = function(cb) { body._mceOC = cb; };
      body.onCollideEnd = function(cb) { body._mceOCE = cb; };
      body.onCollideActive = function(cb) { body._mceOCA = cb; };
      return body;
    };
    matter.after("Engine.create", function() {
      matter.Events.on(this, "collisionStart", function(event) {
        event.pairs.map(function (pair) {
          sendEvent(pair, "onCollide");
        });
      });

      matter.Events.on(this, "collisionActive", function(event) {
        event.pairs.map(function (pair) {
          sendEvent(pair, "onCollideActive");
        });
      });

      matter.Events.on(this, "collisionEnd", function(event) {
        event.pairs.map(function (pair) {
          sendEvent(pair, "onCollideEnd");
        });
      });
    });
  },
};


module.exports = {MatterCollisionEvents};