/*!
 * Masonry layout mode
 * sub-classes Masonry
 * http://masonry.desandro.com
 */

( function( window, factory ) {
  'use strict';
  // universal module definition
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( [
        '../layout-mode',
        'masonry/masonry'
      ],
      factory );
  } else if ( typeof exports == 'object' ) {
    // CommonJS
    module.exports = factory(
      require('../layout-mode'),
      require('masonry-layout')
    );
  } else {
    // browser global
    factory(
      window.Isotope.LayoutMode,
      window.Masonry
    );
  }

}( window, function factory( LayoutMode, Masonry ) {
'use strict';

// -------------------------- helpers -------------------------- //

// extend objects
function extend( a, b ) {
  for ( var prop in b ) {
    a[ prop ] = b[ prop ];
  }
  return a;
}

// -------------------------- masonryDefinition -------------------------- //

  // create an Outlayer layout class
  var MasonryMode = LayoutMode.create('masonry');

  // save on to these methods
  var _getElementOffset = MasonryMode.prototype._getElementOffset;
  var layout = MasonryMode.prototype.layout;
  var _getMeasurement = MasonryMode.prototype._getMeasurement;

  // sub-class Masonry
  extend( MasonryMode.prototype, Masonry.prototype );

  // set back, as it was overwritten by Masonry
  MasonryMode.prototype._getElementOffset = _getElementOffset;
  MasonryMode.prototype.layout = layout;
  MasonryMode.prototype._getMeasurement = _getMeasurement;

  var measureColumns = MasonryMode.prototype.measureColumns;
  MasonryMode.prototype.measureColumns = function() {
    // set items, used if measuring first item
    this.items = this.isotope.filteredItems;
    measureColumns.call( this );
  };

  // HACK copy over isOriginLeft/Top options
  var _manageStamp = MasonryMode.prototype._manageStamp;
  MasonryMode.prototype._manageStamp = function() {
    this.options.isOriginLeft = this.isotope.options.isOriginLeft;
    this.options.isOriginTop = this.isotope.options.isOriginTop;
    _manageStamp.apply( this, arguments );
  };

  return MasonryMode;

}));