setBodyContactCallback box2d excutes callback twice?!HELP

[rhllor]

hello does anyone know why setBodyContactCallback executes the callback function twice ? and is there a way to make it execute only once. thanks

[rhllor]

 

game.elements.ship.body.setBodyContactCallback(game.elements.rightMap, function (destroy){

 

  game.elements.ship.body.velocity.y -= -5;

  game.elements.ship.body.x = game.width*0.5;

  game.elements.ship.body.y = game.height*0.5;

  this.lostLife();

 

            }, this);

[kleepklep]

I have a similar situation where I am using setBodyContactCallback to trigger something when it hits a sensor, but I only want the callback to fire once. Since there is no removeBodyContactCallback, I found that if I set the callback again with the function parameter empty it effectively kills it. Seems like there should be a better way to do this, but I'm not finding it in the Phaser Box2D Plugin API docs.
 

ball.setBodyContactCallback(levelScene.getBody('sensor1'), function () {	ball.setBodyContactCallback(levelScene.getBody('sensor1'));//kills callback	console.log("ball hit sensor!");			}});

[kleepklep]

Digging around in Body.js for something else I came across this:

 

* @param {function} callback - The callback to fire on contact. Set to null to clear a previously set callback.

So passing no function like I did is intended behavior. Lucky guess!