/* Background autoscale script.
 * ----------------------------------------------------------------------------
 *
 * Copyright (C) 2009-2010 Raphaël Bois.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * ----------------------------------------------------------------------------
 * bg-scale.js
 */

try {
  if (!MooTools || MooTools.version != '1.2.4') {
    throw "blah!";
  }
} catch (e) { throw "This module requires MooTools 1.2.4 !"; }

var BgScale = new Class({
  Binds: ["scale"],
  initialize: function(div, img) {
    this.bgDiv = $(div);
    this.bgImg = $(img);
  },
  getMarginTop: function(imgHeight, viewHeight) {
    return 0;
  },
  getMarginLeft: function(imgWidth, viewWidth) {
    return (viewWidth + imgWidth) / 2;
  },
  scale: function() {
    if (!this.bgDiv || !this.bgImg) { return; }
    var s = $(window).getSize();
    this.bgDiv.setStyle('width', s.x);
    this.bgDiv.setStyle('height', s.y);
    this.bgDiv.set('class', "");
    var ms = s.y > s.x ? s.y : s.x;
    this.bgImg.setStyle('width', ms);
    this.bgImg.setStyle('height', ms);
    if (s.x > s.y) {
      this.bgImg.setStyle('margin-left', 0);
      this.bgImg.setStyle('margin-top', this.getMarginTop(s.x, s.y));
    } else {
      this.bgImg.setStyle('margin-top', 0);
      this.bgImg.setStyle('margin-left', this.getMarginTop(s.y, s.x));
    }
  }
});