onresize Code that runs on resize

[01271]

Hey all, I want to resize an element but not as often as I currently do it.

Right now I have a project with an html element that gets resized on every frame and it runs on every update.

game.gui.TextArea = me.Renderable.extend({
  init: function() {
    this.textarea = document.createElement('textarea');
    this.textarea.id = 'textHistory';
    this.textarea.readOnly = "true";
    this.textarea.disabled = "true";
    me.video.getWrapper().appendChild(this.textarea);

  },
  update: function() {
    videoPos = me.video.getPos();
    this.textarea.style = 'width:' + (window.innerWidth - videoPos.width)  + 'px; height:' + videoPos.height + 'px;';
  }
});

I'm concerned about this, this code will run way more often than it needs. Not sure about the performance impact but it only needs to run when the window size is updated. Is there a way I can piggyback on any melonjs functions that resize the canvas and only run it then?

[obiot]

Hello,

you should be able to use the WINDOW_ONRESIZE event, that is triggered every time the display is resize, so for example  :

var self = this;

me.event.subscribe(me.event.WINDOW_ONRESIZE, function () {
   var videoPos = me.video.getPos();
   self.textarea.style = 'width:' + (window.innerWidth - videoPos.width)  + 'px; height:' + videoPos.height + 'px;';
});

also the size you can also directly use the default game camera/viewport (me.game.viewport.width and me.game.viewport.height) that is also automatically resize to match with the canvas size.

[Parasyte]

There's also VIEWPORT_ONRESIZE. Depending on which event you really care about. But the event handler is definitely the right way to handle this.

[obiot]

Indeed VIEWPORT_RESIZE is probably better, and if i’m correct the new width and height are even passed as parameters.

http://melonjs.github.io/melonJS/docs/me.event.html#VIEWPORT_ONRESIZE

[01271]

Thanks for that, I was looking in the classes and I totally missed out on the events, that one with the window onresize works very well.