No Screen Edge Scroll

ControlsMode.prototype.controls = function() {
  var a, j, len, numSel, ref, ref1, thing, z;
  if (!commander) {
    return;
  }
  this.keyScroll[0] *= .8;
  this.keyScroll[1] *= .8;
  a = 10 * this.zoom * settings.speedValue("Scroll Speed");
  this.keyScroll[1] += (this.panUp + this.panDown) * a;
  this.keyScroll[0] += (this.panLeft + this.panRight) * a;
  v2.add(this.focus, this.keyScroll);
  if (v2.mag(this.focus) > this.mapBounds) {
    this.focus[0] -= this.focus[0] * .003;
    this.focus[1] -= this.focus[1] * .003;
  }
  this.keyZoom *= .9;
  z = .02;
  this.keyZoom += (this.zoomIn + this.zoomOut) * z * settings.speedValue("Scroll Speed");
  this.zoom += this.keyZoom;
  if (this.zoom < 0.5) {
    this.zoom = 0.5;
  }
  if (this.zoom > 10) {
    this.zoom = 10;
  }
  numSel = (ref = commander.selection) != null ? ref.length : void 0;
  if (this.centerOnUnit && numSel > 0) {
    this.focus[0] = 0;
    this.focus[1] = 0;
    ref1 = commander.selection;
    for (j = 0, len = ref1.length; j < len; j++) {
      thing = ref1[j];
      this.focus[0] -= thing.pos[0] / numSel;
      this.focus[1] -= thing.pos[1] / numSel;
    }
  }
};