themes-wordpress/altofocus/assets/js/isotope.pkgd.js

/*!
 * Isotope PACKAGED v3.0.1
 *
 * Licensed GPLv3 for open source use
 * or Isotope Commercial License for commercial use
 *
 * http://isotope.metafizzy.co
 * Copyright 2016 Metafizzy
 */

/**
 * Bridget makes jQuery widgets
 * v2.0.0
 * MIT license
 */

/* jshint browser: true, strict: true, undef: true, unused: true */

( function( window, factory ) {
  'use strict';
  /* globals define: false, module: false, require: false */

  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'jquery-bridget/jquery-bridget',[ 'jquery' ], function( jQuery ) {
      factory( window, jQuery );
    });
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      window,
      require('jquery')
    );
  } else {
    // browser global
    window.jQueryBridget = factory(
      window,
      window.jQuery
    );
  }

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

// ----- utils ----- //

var arraySlice = Array.prototype.slice;

// helper function for logging errors
// $.error breaks jQuery chaining
var console = window.console;
var logError = typeof console == 'undefined' ? function() {} :
  function( message ) {
    console.error( message );
  };

// ----- jQueryBridget ----- //

function jQueryBridget( namespace, PluginClass, $ ) {
  $ = $ || jQuery || window.jQuery;
  if ( !$ ) {
    return;
  }

  // add option method -> $().plugin('option', {...})
  if ( !PluginClass.prototype.option ) {
    // option setter
    PluginClass.prototype.option = function( opts ) {
      // bail out if not an object
      if ( !$.isPlainObject( opts ) ){
        return;
      }
      this.options = $.extend( true, this.options, opts );
    };
  }

  // make jQuery plugin
  $.fn[ namespace ] = function( arg0 /*, arg1 */ ) {
    if ( typeof arg0 == 'string' ) {
      // method call $().plugin( 'methodName', { options } )
      // shift arguments by 1
      var args = arraySlice.call( arguments, 1 );
      return methodCall( this, arg0, args );
    }
    // just $().plugin({ options })
    plainCall( this, arg0 );
    return this;
  };

  // $().plugin('methodName')
  function methodCall( $elems, methodName, args ) {
    var returnValue;
    var pluginMethodStr = '$().' + namespace + '("' + methodName + '")';

    $elems.each( function( i, elem ) {
      // get instance
      var instance = $.data( elem, namespace );
      if ( !instance ) {
        logError( namespace + ' not initialized. Cannot call methods, i.e. ' +
          pluginMethodStr );
        return;
      }

      var method = instance[ methodName ];
      if ( !method || methodName.charAt(0) == '_' ) {
        logError( pluginMethodStr + ' is not a valid method' );
        return;
      }

      // apply method, get return value
      var value = method.apply( instance, args );
      // set return value if value is returned, use only first value
      returnValue = returnValue === undefined ? value : returnValue;
    });

    return returnValue !== undefined ? returnValue : $elems;
  }

  function plainCall( $elems, options ) {
    $elems.each( function( i, elem ) {
      var instance = $.data( elem, namespace );
      if ( instance ) {
        // set options & init
        instance.option( options );
        instance._init();
      } else {
        // initialize new instance
        instance = new PluginClass( elem, options );
        $.data( elem, namespace, instance );
      }
    });
  }

  updateJQuery( $ );

}

// ----- updateJQuery ----- //

// set $.bridget for v1 backwards compatibility
function updateJQuery( $ ) {
  if ( !$ || ( $ && $.bridget ) ) {
    return;
  }
  $.bridget = jQueryBridget;
}

updateJQuery( jQuery || window.jQuery );

// -----  ----- //

return jQueryBridget;

}));

/**
 * EvEmitter v1.0.3
 * Lil' event emitter
 * MIT License
 */

/* jshint unused: true, undef: true, strict: true */

( function( global, factory ) {
  // universal module definition
  /* jshint strict: false */ /* globals define, module, window */
  if ( typeof define == 'function' && define.amd ) {
    // AMD - RequireJS
    define( 'ev-emitter/ev-emitter',factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS - Browserify, Webpack
    module.exports = factory();
  } else {
    // Browser globals
    global.EvEmitter = factory();
  }

}( typeof window != 'undefined' ? window : this, function() {



function EvEmitter() {}

var proto = EvEmitter.prototype;

proto.on = function( eventName, listener ) {
  if ( !eventName || !listener ) {
    return;
  }
  // set events hash
  var events = this._events = this._events || {};
  // set listeners array
  var listeners = events[ eventName ] = events[ eventName ] || [];
  // only add once
  if ( listeners.indexOf( listener ) == -1 ) {
    listeners.push( listener );
  }

  return this;
};

proto.once = function( eventName, listener ) {
  if ( !eventName || !listener ) {
    return;
  }
  // add event
  this.on( eventName, listener );
  // set once flag
  // set onceEvents hash
  var onceEvents = this._onceEvents = this._onceEvents || {};
  // set onceListeners object
  var onceListeners = onceEvents[ eventName ] = onceEvents[ eventName ] || {};
  // set flag
  onceListeners[ listener ] = true;

  return this;
};

proto.off = function( eventName, listener ) {
  var listeners = this._events && this._events[ eventName ];
  if ( !listeners || !listeners.length ) {
    return;
  }
  var index = listeners.indexOf( listener );
  if ( index != -1 ) {
    listeners.splice( index, 1 );
  }

  return this;
};

proto.emitEvent = function( eventName, args ) {
  var listeners = this._events && this._events[ eventName ];
  if ( !listeners || !listeners.length ) {
    return;
  }
  var i = 0;
  var listener = listeners[i];
  args = args || [];
  // once stuff
  var onceListeners = this._onceEvents && this._onceEvents[ eventName ];

  while ( listener ) {
    var isOnce = onceListeners && onceListeners[ listener ];
    if ( isOnce ) {
      // remove listener
      // remove before trigger to prevent recursion
      this.off( eventName, listener );
      // unset once flag
      delete onceListeners[ listener ];
    }
    // trigger listener
    listener.apply( this, args );
    // get next listener
    i += isOnce ? 0 : 1;
    listener = listeners[i];
  }

  return this;
};

return EvEmitter;

}));

/*!
 * getSize v2.0.2
 * measure size of elements
 * MIT license
 */

/*jshint browser: true, strict: true, undef: true, unused: true */
/*global define: false, module: false, console: false */

( function( window, factory ) {
  'use strict';

  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'get-size/get-size',[],function() {
      return factory();
    });
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory();
  } else {
    // browser global
    window.getSize = factory();
  }

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

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

// get a number from a string, not a percentage
function getStyleSize( value ) {
  var num = parseFloat( value );
  // not a percent like '100%', and a number
  var isValid = value.indexOf('%') == -1 && !isNaN( num );
  return isValid && num;
}

function noop() {}

var logError = typeof console == 'undefined' ? noop :
  function( message ) {
    console.error( message );
  };

// -------------------------- measurements -------------------------- //

var measurements = [
  'paddingLeft',
  'paddingRight',
  'paddingTop',
  'paddingBottom',
  'marginLeft',
  'marginRight',
  'marginTop',
  'marginBottom',
  'borderLeftWidth',
  'borderRightWidth',
  'borderTopWidth',
  'borderBottomWidth'
];

var measurementsLength = measurements.length;

function getZeroSize() {
  var size = {
    width: 0,
    height: 0,
    innerWidth: 0,
    innerHeight: 0,
    outerWidth: 0,
    outerHeight: 0
  };
  for ( var i=0; i < measurementsLength; i++ ) {
    var measurement = measurements[i];
    size[ measurement ] = 0;
  }
  return size;
}

// -------------------------- getStyle -------------------------- //

/**
 * getStyle, get style of element, check for Firefox bug
 * https://bugzilla.mozilla.org/show_bug.cgi?id=548397
 */
function getStyle( elem ) {
  var style = getComputedStyle( elem );
  if ( !style ) {
    logError( 'Style returned ' + style +
      '. Are you running this code in a hidden iframe on Firefox? ' +
      'See http://bit.ly/getsizebug1' );
  }
  return style;
}

// -------------------------- setup -------------------------- //

var isSetup = false;

var isBoxSizeOuter;

/**
 * setup
 * check isBoxSizerOuter
 * do on first getSize() rather than on page load for Firefox bug
 */
function setup() {
  // setup once
  if ( isSetup ) {
    return;
  }
  isSetup = true;

  // -------------------------- box sizing -------------------------- //

  /**
   * WebKit measures the outer-width on style.width on border-box elems
   * IE & Firefox<29 measures the inner-width
   */
  var div = document.createElement('div');
  div.style.width = '200px';
  div.style.padding = '1px 2px 3px 4px';
  div.style.borderStyle = 'solid';
  div.style.borderWidth = '1px 2px 3px 4px';
  div.style.boxSizing = 'border-box';

  var body = document.body || document.documentElement;
  body.appendChild( div );
  var style = getStyle( div );

  getSize.isBoxSizeOuter = isBoxSizeOuter = getStyleSize( style.width ) == 200;
  body.removeChild( div );

}

// -------------------------- getSize -------------------------- //

function getSize( elem ) {
  setup();

  // use querySeletor if elem is string
  if ( typeof elem == 'string' ) {
    elem = document.querySelector( elem );
  }

  // do not proceed on non-objects
  if ( !elem || typeof elem != 'object' || !elem.nodeType ) {
    return;
  }

  var style = getStyle( elem );

  // if hidden, everything is 0
  if ( style.display == 'none' ) {
    return getZeroSize();
  }

  var size = {};
  size.width = elem.offsetWidth;
  size.height = elem.offsetHeight;

  var isBorderBox = size.isBorderBox = style.boxSizing == 'border-box';

  // get all measurements
  for ( var i=0; i < measurementsLength; i++ ) {
    var measurement = measurements[i];
    var value = style[ measurement ];
    var num = parseFloat( value );
    // any 'auto', 'medium' value will be 0
    size[ measurement ] = !isNaN( num ) ? num : 0;
  }

  var paddingWidth = size.paddingLeft + size.paddingRight;
  var paddingHeight = size.paddingTop + size.paddingBottom;
  var marginWidth = size.marginLeft + size.marginRight;
  var marginHeight = size.marginTop + size.marginBottom;
  var borderWidth = size.borderLeftWidth + size.borderRightWidth;
  var borderHeight = size.borderTopWidth + size.borderBottomWidth;

  var isBorderBoxSizeOuter = isBorderBox && isBoxSizeOuter;

  // overwrite width and height if we can get it from style
  var styleWidth = getStyleSize( style.width );
  if ( styleWidth !== false ) {
    size.width = styleWidth +
      // add padding and border unless it's already including it
      ( isBorderBoxSizeOuter ? 0 : paddingWidth + borderWidth );
  }

  var styleHeight = getStyleSize( style.height );
  if ( styleHeight !== false ) {
    size.height = styleHeight +
      // add padding and border unless it's already including it
      ( isBorderBoxSizeOuter ? 0 : paddingHeight + borderHeight );
  }

  size.innerWidth = size.width - ( paddingWidth + borderWidth );
  size.innerHeight = size.height - ( paddingHeight + borderHeight );

  size.outerWidth = size.width + marginWidth;
  size.outerHeight = size.height + marginHeight;

  return size;
}

return getSize;

});

/**
 * matchesSelector v2.0.1
 * matchesSelector( element, '.selector' )
 * MIT license
 */

/*jshint browser: true, strict: true, undef: true, unused: true */

( function( window, factory ) {
  /*global define: false, module: false */
  'use strict';
  // universal module definition
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'desandro-matches-selector/matches-selector',factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory();
  } else {
    // browser global
    window.matchesSelector = factory();
  }

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

  var matchesMethod = ( function() {
    var ElemProto = Element.prototype;
    // check for the standard method name first
    if ( ElemProto.matches ) {
      return 'matches';
    }
    // check un-prefixed
    if ( ElemProto.matchesSelector ) {
      return 'matchesSelector';
    }
    // check vendor prefixes
    var prefixes = [ 'webkit', 'moz', 'ms', 'o' ];

    for ( var i=0; i < prefixes.length; i++ ) {
      var prefix = prefixes[i];
      var method = prefix + 'MatchesSelector';
      if ( ElemProto[ method ] ) {
        return method;
      }
    }
  })();

  return function matchesSelector( elem, selector ) {
    return elem[ matchesMethod ]( selector );
  };

}));

/**
 * Fizzy UI utils v2.0.2
 * MIT license
 */

/*jshint browser: true, undef: true, unused: true, strict: true */

( function( window, factory ) {
  // universal module definition
  /*jshint strict: false */ /*globals define, module, require */

  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'fizzy-ui-utils/utils',[
      'desandro-matches-selector/matches-selector'
    ], function( matchesSelector ) {
      return factory( window, matchesSelector );
    });
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      window,
      require('desandro-matches-selector')
    );
  } else {
    // browser global
    window.fizzyUIUtils = factory(
      window,
      window.matchesSelector
    );
  }

}( window, function factory( window, matchesSelector ) {



var utils = {};

// ----- extend ----- //

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

// ----- modulo ----- //

utils.modulo = function( num, div ) {
  return ( ( num % div ) + div ) % div;
};

// ----- makeArray ----- //

// turn element or nodeList into an array
utils.makeArray = function( obj ) {
  var ary = [];
  if ( Array.isArray( obj ) ) {
    // use object if already an array
    ary = obj;
  } else if ( obj && typeof obj.length == 'number' ) {
    // convert nodeList to array
    for ( var i=0; i < obj.length; i++ ) {
      ary.push( obj[i] );
    }
  } else {
    // array of single index
    ary.push( obj );
  }
  return ary;
};

// ----- removeFrom ----- //

utils.removeFrom = function( ary, obj ) {
  var index = ary.indexOf( obj );
  if ( index != -1 ) {
    ary.splice( index, 1 );
  }
};

// ----- getParent ----- //

utils.getParent = function( elem, selector ) {
  while ( elem != document.body ) {
    elem = elem.parentNode;
    if ( matchesSelector( elem, selector ) ) {
      return elem;
    }
  }
};

// ----- getQueryElement ----- //

// use element as selector string
utils.getQueryElement = function( elem ) {
  if ( typeof elem == 'string' ) {
    return document.querySelector( elem );
  }
  return elem;
};

// ----- handleEvent ----- //

// enable .ontype to trigger from .addEventListener( elem, 'type' )
utils.handleEvent = function( event ) {
  var method = 'on' + event.type;
  if ( this[ method ] ) {
    this[ method ]( event );
  }
};

// ----- filterFindElements ----- //

utils.filterFindElements = function( elems, selector ) {
  // make array of elems
  elems = utils.makeArray( elems );
  var ffElems = [];

  elems.forEach( function( elem ) {
    // check that elem is an actual element
    if ( !( elem instanceof HTMLElement ) ) {
      return;
    }
    // add elem if no selector
    if ( !selector ) {
      ffElems.push( elem );
      return;
    }
    // filter & find items if we have a selector
    // filter
    if ( matchesSelector( elem, selector ) ) {
      ffElems.push( elem );
    }
    // find children
    var childElems = elem.querySelectorAll( selector );
    // concat childElems to filterFound array
    for ( var i=0; i < childElems.length; i++ ) {
      ffElems.push( childElems[i] );
    }
  });

  return ffElems;
};

// ----- debounceMethod ----- //

utils.debounceMethod = function( _class, methodName, threshold ) {
  // original method
  var method = _class.prototype[ methodName ];
  var timeoutName = methodName + 'Timeout';

  _class.prototype[ methodName ] = function() {
    var timeout = this[ timeoutName ];
    if ( timeout ) {
      clearTimeout( timeout );
    }
    var args = arguments;

    var _this = this;
    this[ timeoutName ] = setTimeout( function() {
      method.apply( _this, args );
      delete _this[ timeoutName ];
    }, threshold || 100 );
  };
};

// ----- docReady ----- //

utils.docReady = function( callback ) {
  var readyState = document.readyState;
  if ( readyState == 'complete' || readyState == 'interactive' ) {
    callback();
  } else {
    document.addEventListener( 'DOMContentLoaded', callback );
  }
};

// ----- htmlInit ----- //

// http://jamesroberts.name/blog/2010/02/22/string-functions-for-javascript-trim-to-camel-case-to-dashed-and-to-underscore/
utils.toDashed = function( str ) {
  return str.replace( /(.)([A-Z])/g, function( match, $1, $2 ) {
    return $1 + '-' + $2;
  }).toLowerCase();
};

var console = window.console;
/**
 * allow user to initialize classes via [data-namespace] or .js-namespace class
 * htmlInit( Widget, 'widgetName' )
 * options are parsed from data-namespace-options
 */
utils.htmlInit = function( WidgetClass, namespace ) {
  utils.docReady( function() {
    var dashedNamespace = utils.toDashed( namespace );
    var dataAttr = 'data-' + dashedNamespace;
    var dataAttrElems = document.querySelectorAll( '[' + dataAttr + ']' );
    var jsDashElems = document.querySelectorAll( '.js-' + dashedNamespace );
    var elems = utils.makeArray( dataAttrElems )
      .concat( utils.makeArray( jsDashElems ) );
    var dataOptionsAttr = dataAttr + '-options';
    var jQuery = window.jQuery;

    elems.forEach( function( elem ) {
      var attr = elem.getAttribute( dataAttr ) ||
        elem.getAttribute( dataOptionsAttr );
      var options;
      try {
        options = attr && JSON.parse( attr );
      } catch ( error ) {
        // log error, do not initialize
        if ( console ) {
          console.error( 'Error parsing ' + dataAttr + ' on ' + elem.className +
          ': ' + error );
        }
        return;
      }
      // initialize
      var instance = new WidgetClass( elem, options );
      // make available via $().data('layoutname')
      if ( jQuery ) {
        jQuery.data( elem, namespace, instance );
      }
    });

  });
};

// -----  ----- //

return utils;

}));

/**
 * Outlayer Item
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /* globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD - RequireJS
    define( 'outlayer/item',[
        'ev-emitter/ev-emitter',
        'get-size/get-size'
      ],
      factory
    );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS - Browserify, Webpack
    module.exports = factory(
      require('ev-emitter'),
      require('get-size')
    );
  } else {
    // browser global
    window.Outlayer = {};
    window.Outlayer.Item = factory(
      window.EvEmitter,
      window.getSize
    );
  }

}( window, function factory( EvEmitter, getSize ) {
'use strict';

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

function isEmptyObj( obj ) {
  for ( var prop in obj ) {
    return false;
  }
  prop = null;
  return true;
}

// -------------------------- CSS3 support -------------------------- //


var docElemStyle = document.documentElement.style;

var transitionProperty = typeof docElemStyle.transition == 'string' ?
  'transition' : 'WebkitTransition';
var transformProperty = typeof docElemStyle.transform == 'string' ?
  'transform' : 'WebkitTransform';

var transitionEndEvent = {
  WebkitTransition: 'webkitTransitionEnd',
  transition: 'transitionend'
}[ transitionProperty ];

// cache all vendor properties that could have vendor prefix
var vendorProperties = {
  transform: transformProperty,
  transition: transitionProperty,
  transitionDuration: transitionProperty + 'Duration',
  transitionProperty: transitionProperty + 'Property',
  transitionDelay: transitionProperty + 'Delay'
};

// -------------------------- Item -------------------------- //

function Item( element, layout ) {
  if ( !element ) {
    return;
  }

  this.element = element;
  // parent layout class, i.e. Masonry, Isotope, or Packery
  this.layout = layout;
  this.position = {
    x: 0,
    y: 0
  };

  this._create();
}

// inherit EvEmitter
var proto = Item.prototype = Object.create( EvEmitter.prototype );
proto.constructor = Item;

proto._create = function() {
  // transition objects
  this._transn = {
    ingProperties: {},
    clean: {},
    onEnd: {}
  };

  this.css({
    position: 'absolute'
  });
};

// trigger specified handler for event type
proto.handleEvent = function( event ) {
  var method = 'on' + event.type;
  if ( this[ method ] ) {
    this[ method ]( event );
  }
};

proto.getSize = function() {
  this.size = getSize( this.element );
};

/**
 * apply CSS styles to element
 * @param {Object} style
 */
proto.css = function( style ) {
  var elemStyle = this.element.style;

  for ( var prop in style ) {
    // use vendor property if available
    var supportedProp = vendorProperties[ prop ] || prop;
    elemStyle[ supportedProp ] = style[ prop ];
  }
};

 // measure position, and sets it
proto.getPosition = function() {
  var style = getComputedStyle( this.element );
  var isOriginLeft = this.layout._getOption('originLeft');
  var isOriginTop = this.layout._getOption('originTop');
  var xValue = style[ isOriginLeft ? 'left' : 'right' ];
  var yValue = style[ isOriginTop ? 'top' : 'bottom' ];
  // convert percent to pixels
  var layoutSize = this.layout.size;
  var x = xValue.indexOf('%') != -1 ?
    ( parseFloat( xValue ) / 100 ) * layoutSize.width : parseInt( xValue, 10 );
  var y = yValue.indexOf('%') != -1 ?
    ( parseFloat( yValue ) / 100 ) * layoutSize.height : parseInt( yValue, 10 );

  // clean up 'auto' or other non-integer values
  x = isNaN( x ) ? 0 : x;
  y = isNaN( y ) ? 0 : y;
  // remove padding from measurement
  x -= isOriginLeft ? layoutSize.paddingLeft : layoutSize.paddingRight;
  y -= isOriginTop ? layoutSize.paddingTop : layoutSize.paddingBottom;

  this.position.x = x;
  this.position.y = y;
};

// set settled position, apply padding
proto.layoutPosition = function() {
  var layoutSize = this.layout.size;
  var style = {};
  var isOriginLeft = this.layout._getOption('originLeft');
  var isOriginTop = this.layout._getOption('originTop');

  // x
  var xPadding = isOriginLeft ? 'paddingLeft' : 'paddingRight';
  var xProperty = isOriginLeft ? 'left' : 'right';
  var xResetProperty = isOriginLeft ? 'right' : 'left';

  var x = this.position.x + layoutSize[ xPadding ];
  // set in percentage or pixels
  style[ xProperty ] = this.getXValue( x );
  // reset other property
  style[ xResetProperty ] = '';

  // y
  var yPadding = isOriginTop ? 'paddingTop' : 'paddingBottom';
  var yProperty = isOriginTop ? 'top' : 'bottom';
  var yResetProperty = isOriginTop ? 'bottom' : 'top';

  var y = this.position.y + layoutSize[ yPadding ];
  // set in percentage or pixels
  style[ yProperty ] = this.getYValue( y );
  // reset other property
  style[ yResetProperty ] = '';

  this.css( style );
  this.emitEvent( 'layout', [ this ] );
};

proto.getXValue = function( x ) {
  var isHorizontal = this.layout._getOption('horizontal');
  return this.layout.options.percentPosition && !isHorizontal ?
    ( ( x / this.layout.size.width ) * 100 ) + '%' : x + 'px';
};

proto.getYValue = function( y ) {
  var isHorizontal = this.layout._getOption('horizontal');
  return this.layout.options.percentPosition && isHorizontal ?
    ( ( y / this.layout.size.height ) * 100 ) + '%' : y + 'px';
};

proto._transitionTo = function( x, y ) {
  this.getPosition();
  // get current x & y from top/left
  var curX = this.position.x;
  var curY = this.position.y;

  var compareX = parseInt( x, 10 );
  var compareY = parseInt( y, 10 );
  var didNotMove = compareX === this.position.x && compareY === this.position.y;

  // save end position
  this.setPosition( x, y );

  // if did not move and not transitioning, just go to layout
  if ( didNotMove && !this.isTransitioning ) {
    this.layoutPosition();
    return;
  }

  var transX = x - curX;
  var transY = y - curY;
  var transitionStyle = {};
  transitionStyle.transform = this.getTranslate( transX, transY );

  this.transition({
    to: transitionStyle,
    onTransitionEnd: {
      transform: this.layoutPosition
    },
    isCleaning: true
  });
};

proto.getTranslate = function( x, y ) {
  // flip cooridinates if origin on right or bottom
  var isOriginLeft = this.layout._getOption('originLeft');
  var isOriginTop = this.layout._getOption('originTop');
  x = isOriginLeft ? x : -x;
  y = isOriginTop ? y : -y;
  return 'translate3d(' + x + 'px, ' + y + 'px, 0)';
};

// non transition + transform support
proto.goTo = function( x, y ) {
  this.setPosition( x, y );
  this.layoutPosition();
};

proto.moveTo = proto._transitionTo;

proto.setPosition = function( x, y ) {
  this.position.x = parseInt( x, 10 );
  this.position.y = parseInt( y, 10 );
};

// ----- transition ----- //

/**
 * @param {Object} style - CSS
 * @param {Function} onTransitionEnd
 */

// non transition, just trigger callback
proto._nonTransition = function( args ) {
  this.css( args.to );
  if ( args.isCleaning ) {
    this._removeStyles( args.to );
  }
  for ( var prop in args.onTransitionEnd ) {
    args.onTransitionEnd[ prop ].call( this );
  }
};

/**
 * proper transition
 * @param {Object} args - arguments
 *   @param {Object} to - style to transition to
 *   @param {Object} from - style to start transition from
 *   @param {Boolean} isCleaning - removes transition styles after transition
 *   @param {Function} onTransitionEnd - callback
 */
proto.transition = function( args ) {
  // redirect to nonTransition if no transition duration
  if ( !parseFloat( this.layout.options.transitionDuration ) ) {
    this._nonTransition( args );
    return;
  }

  var _transition = this._transn;
  // keep track of onTransitionEnd callback by css property
  for ( var prop in args.onTransitionEnd ) {
    _transition.onEnd[ prop ] = args.onTransitionEnd[ prop ];
  }
  // keep track of properties that are transitioning
  for ( prop in args.to ) {
    _transition.ingProperties[ prop ] = true;
    // keep track of properties to clean up when transition is done
    if ( args.isCleaning ) {
      _transition.clean[ prop ] = true;
    }
  }

  // set from styles
  if ( args.from ) {
    this.css( args.from );
    // force redraw. http://blog.alexmaccaw.com/css-transitions
    var h = this.element.offsetHeight;
    // hack for JSHint to hush about unused var
    h = null;
  }
  // enable transition
  this.enableTransition( args.to );
  // set styles that are transitioning
  this.css( args.to );

  this.isTransitioning = true;

};

// dash before all cap letters, including first for
// WebkitTransform => -webkit-transform
function toDashedAll( str ) {
  return str.replace( /([A-Z])/g, function( $1 ) {
    return '-' + $1.toLowerCase();
  });
}

var transitionProps = 'opacity,' + toDashedAll( transformProperty );

proto.enableTransition = function(/* style */) {
  // HACK changing transitionProperty during a transition
  // will cause transition to jump
  if ( this.isTransitioning ) {
    return;
  }

  // make `transition: foo, bar, baz` from style object
  // HACK un-comment this when enableTransition can work
  // while a transition is happening
  // var transitionValues = [];
  // for ( var prop in style ) {
  //   // dash-ify camelCased properties like WebkitTransition
  //   prop = vendorProperties[ prop ] || prop;
  //   transitionValues.push( toDashedAll( prop ) );
  // }
  // munge number to millisecond, to match stagger
  var duration = this.layout.options.transitionDuration;
  duration = typeof duration == 'number' ? duration + 'ms' : duration;
  // enable transition styles
  this.css({
    transitionProperty: transitionProps,
    transitionDuration: duration,
    transitionDelay: this.staggerDelay || 0
  });
  // listen for transition end event
  this.element.addEventListener( transitionEndEvent, this, false );
};

// ----- events ----- //

proto.onwebkitTransitionEnd = function( event ) {
  this.ontransitionend( event );
};

proto.onotransitionend = function( event ) {
  this.ontransitionend( event );
};

// properties that I munge to make my life easier
var dashedVendorProperties = {
  '-webkit-transform': 'transform'
};

proto.ontransitionend = function( event ) {
  // disregard bubbled events from children
  if ( event.target !== this.element ) {
    return;
  }
  var _transition = this._transn;
  // get property name of transitioned property, convert to prefix-free
  var propertyName = dashedVendorProperties[ event.propertyName ] || event.propertyName;

  // remove property that has completed transitioning
  delete _transition.ingProperties[ propertyName ];
  // check if any properties are still transitioning
  if ( isEmptyObj( _transition.ingProperties ) ) {
    // all properties have completed transitioning
    this.disableTransition();
  }
  // clean style
  if ( propertyName in _transition.clean ) {
    // clean up style
    this.element.style[ event.propertyName ] = '';
    delete _transition.clean[ propertyName ];
  }
  // trigger onTransitionEnd callback
  if ( propertyName in _transition.onEnd ) {
    var onTransitionEnd = _transition.onEnd[ propertyName ];
    onTransitionEnd.call( this );
    delete _transition.onEnd[ propertyName ];
  }

  this.emitEvent( 'transitionEnd', [ this ] );
};

proto.disableTransition = function() {
  this.removeTransitionStyles();
  this.element.removeEventListener( transitionEndEvent, this, false );
  this.isTransitioning = false;
};

/**
 * removes style property from element
 * @param {Object} style
**/
proto._removeStyles = function( style ) {
  // clean up transition styles
  var cleanStyle = {};
  for ( var prop in style ) {
    cleanStyle[ prop ] = '';
  }
  this.css( cleanStyle );
};

var cleanTransitionStyle = {
  transitionProperty: '',
  transitionDuration: '',
  transitionDelay: ''
};

proto.removeTransitionStyles = function() {
  // remove transition
  this.css( cleanTransitionStyle );
};

// ----- stagger ----- //

proto.stagger = function( delay ) {
  delay = isNaN( delay ) ? 0 : delay;
  this.staggerDelay = delay + 'ms';
};

// ----- show/hide/remove ----- //

// remove element from DOM
proto.removeElem = function() {
  this.element.parentNode.removeChild( this.element );
  // remove display: none
  this.css({ display: '' });
  this.emitEvent( 'remove', [ this ] );
};

proto.remove = function() {
  // just remove element if no transition support or no transition
  if ( !transitionProperty || !parseFloat( this.layout.options.transitionDuration ) ) {
    this.removeElem();
    return;
  }

  // start transition
  this.once( 'transitionEnd', function() {
    this.removeElem();
  });
  this.hide();
};

proto.reveal = function() {
  delete this.isHidden;
  // remove display: none
  this.css({ display: '' });

  var options = this.layout.options;

  var onTransitionEnd = {};
  var transitionEndProperty = this.getHideRevealTransitionEndProperty('visibleStyle');
  onTransitionEnd[ transitionEndProperty ] = this.onRevealTransitionEnd;

  this.transition({
    from: options.hiddenStyle,
    to: options.visibleStyle,
    isCleaning: true,
    onTransitionEnd: onTransitionEnd
  });
};

proto.onRevealTransitionEnd = function() {
  // check if still visible
  // during transition, item may have been hidden
  if ( !this.isHidden ) {
    this.emitEvent('reveal');
  }
};

/**
 * get style property use for hide/reveal transition end
 * @param {String} styleProperty - hiddenStyle/visibleStyle
 * @returns {String}
 */
proto.getHideRevealTransitionEndProperty = function( styleProperty ) {
  var optionStyle = this.layout.options[ styleProperty ];
  // use opacity
  if ( optionStyle.opacity ) {
    return 'opacity';
  }
  // get first property
  for ( var prop in optionStyle ) {
    return prop;
  }
};

proto.hide = function() {
  // set flag
  this.isHidden = true;
  // remove display: none
  this.css({ display: '' });

  var options = this.layout.options;

  var onTransitionEnd = {};
  var transitionEndProperty = this.getHideRevealTransitionEndProperty('hiddenStyle');
  onTransitionEnd[ transitionEndProperty ] = this.onHideTransitionEnd;

  this.transition({
    from: options.visibleStyle,
    to: options.hiddenStyle,
    // keep hidden stuff hidden
    isCleaning: true,
    onTransitionEnd: onTransitionEnd
  });
};

proto.onHideTransitionEnd = function() {
  // check if still hidden
  // during transition, item may have been un-hidden
  if ( this.isHidden ) {
    this.css({ display: 'none' });
    this.emitEvent('hide');
  }
};

proto.destroy = function() {
  this.css({
    position: '',
    left: '',
    right: '',
    top: '',
    bottom: '',
    transition: '',
    transform: ''
  });
};

return Item;

}));

/*!
 * Outlayer v2.1.0
 * the brains and guts of a layout library
 * MIT license
 */

( function( window, factory ) {
  'use strict';
  // universal module definition
  /* jshint strict: false */ /* globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD - RequireJS
    define( 'outlayer/outlayer',[
        'ev-emitter/ev-emitter',
        'get-size/get-size',
        'fizzy-ui-utils/utils',
        './item'
      ],
      function( EvEmitter, getSize, utils, Item ) {
        return factory( window, EvEmitter, getSize, utils, Item);
      }
    );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS - Browserify, Webpack
    module.exports = factory(
      window,
      require('ev-emitter'),
      require('get-size'),
      require('fizzy-ui-utils'),
      require('./item')
    );
  } else {
    // browser global
    window.Outlayer = factory(
      window,
      window.EvEmitter,
      window.getSize,
      window.fizzyUIUtils,
      window.Outlayer.Item
    );
  }

}( window, function factory( window, EvEmitter, getSize, utils, Item ) {
'use strict';

// ----- vars ----- //

var console = window.console;
var jQuery = window.jQuery;
var noop = function() {};

// -------------------------- Outlayer -------------------------- //

// globally unique identifiers
var GUID = 0;
// internal store of all Outlayer intances
var instances = {};


/**
 * @param {Element, String} element
 * @param {Object} options
 * @constructor
 */
function Outlayer( element, options ) {
  var queryElement = utils.getQueryElement( element );
  if ( !queryElement ) {
    if ( console ) {
      console.error( 'Bad element for ' + this.constructor.namespace +
        ': ' + ( queryElement || element ) );
    }
    return;
  }
  this.element = queryElement;
  // add jQuery
  if ( jQuery ) {
    this.$element = jQuery( this.element );
  }

  // options
  this.options = utils.extend( {}, this.constructor.defaults );
  this.option( options );

  // add id for Outlayer.getFromElement
  var id = ++GUID;
  this.element.outlayerGUID = id; // expando
  instances[ id ] = this; // associate via id

  // kick it off
  this._create();

  var isInitLayout = this._getOption('initLayout');
  if ( isInitLayout ) {
    this.layout();
  }
}

// settings are for internal use only
Outlayer.namespace = 'outlayer';
Outlayer.Item = Item;

// default options
Outlayer.defaults = {
  containerStyle: {
    position: 'relative'
  },
  initLayout: true,
  originLeft: true,
  originTop: true,
  resize: true,
  resizeContainer: true,
  // item options
  transitionDuration: '0.4s',
  hiddenStyle: {
    opacity: 0,
    transform: 'scale(0.001)'
  },
  visibleStyle: {
    opacity: 1,
    transform: 'scale(1)'
  }
};

var proto = Outlayer.prototype;
// inherit EvEmitter
utils.extend( proto, EvEmitter.prototype );

/**
 * set options
 * @param {Object} opts
 */
proto.option = function( opts ) {
  utils.extend( this.options, opts );
};

/**
 * get backwards compatible option value, check old name
 */
proto._getOption = function( option ) {
  var oldOption = this.constructor.compatOptions[ option ];
  return oldOption && this.options[ oldOption ] !== undefined ?
    this.options[ oldOption ] : this.options[ option ];
};

Outlayer.compatOptions = {
  // currentName: oldName
  initLayout: 'isInitLayout',
  horizontal: 'isHorizontal',
  layoutInstant: 'isLayoutInstant',
  originLeft: 'isOriginLeft',
  originTop: 'isOriginTop',
  resize: 'isResizeBound',
  resizeContainer: 'isResizingContainer'
};

proto._create = function() {
  // get items from children
  this.reloadItems();
  // elements that affect layout, but are not laid out
  this.stamps = [];
  this.stamp( this.options.stamp );
  // set container style
  utils.extend( this.element.style, this.options.containerStyle );

  // bind resize method
  var canBindResize = this._getOption('resize');
  if ( canBindResize ) {
    this.bindResize();
  }
};

// goes through all children again and gets bricks in proper order
proto.reloadItems = function() {
  // collection of item elements
  this.items = this._itemize( this.element.children );
};


/**
 * turn elements into Outlayer.Items to be used in layout
 * @param {Array or NodeList or HTMLElement} elems
 * @returns {Array} items - collection of new Outlayer Items
 */
proto._itemize = function( elems ) {

  var itemElems = this._filterFindItemElements( elems );
  var Item = this.constructor.Item;

  // create new Outlayer Items for collection
  var items = [];
  for ( var i=0; i < itemElems.length; i++ ) {
    var elem = itemElems[i];
    var item = new Item( elem, this );
    items.push( item );
  }

  return items;
};

/**
 * get item elements to be used in layout
 * @param {Array or NodeList or HTMLElement} elems
 * @returns {Array} items - item elements
 */
proto._filterFindItemElements = function( elems ) {
  return utils.filterFindElements( elems, this.options.itemSelector );
};

/**
 * getter method for getting item elements
 * @returns {Array} elems - collection of item elements
 */
proto.getItemElements = function() {
  return this.items.map( function( item ) {
    return item.element;
  });
};

// ----- init & layout ----- //

/**
 * lays out all items
 */
proto.layout = function() {
  this._resetLayout();
  this._manageStamps();

  // don't animate first layout
  var layoutInstant = this._getOption('layoutInstant');
  var isInstant = layoutInstant !== undefined ?
    layoutInstant : !this._isLayoutInited;
  this.layoutItems( this.items, isInstant );

  // flag for initalized
  this._isLayoutInited = true;
};

// _init is alias for layout
proto._init = proto.layout;

/**
 * logic before any new layout
 */
proto._resetLayout = function() {
  this.getSize();
};


proto.getSize = function() {
  this.size = getSize( this.element );
};

/**
 * get measurement from option, for columnWidth, rowHeight, gutter
 * if option is String -> get element from selector string, & get size of element
 * if option is Element -> get size of element
 * else use option as a number
 *
 * @param {String} measurement
 * @param {String} size - width or height
 * @private
 */
proto._getMeasurement = function( measurement, size ) {
  var option = this.options[ measurement ];
  var elem;
  if ( !option ) {
    // default to 0
    this[ measurement ] = 0;
  } else {
    // use option as an element
    if ( typeof option == 'string' ) {
      elem = this.element.querySelector( option );
    } else if ( option instanceof HTMLElement ) {
      elem = option;
    }
    // use size of element, if element
    this[ measurement ] = elem ? getSize( elem )[ size ] : option;
  }
};

/**
 * layout a collection of item elements
 * @api public
 */
proto.layoutItems = function( items, isInstant ) {
  items = this._getItemsForLayout( items );

  this._layoutItems( items, isInstant );

  this._postLayout();
};

/**
 * get the items to be laid out
 * you may want to skip over some items
 * @param {Array} items
 * @returns {Array} items
 */
proto._getItemsForLayout = function( items ) {
  return items.filter( function( item ) {
    return !item.isIgnored;
  });
};

/**
 * layout items
 * @param {Array} items
 * @param {Boolean} isInstant
 */
proto._layoutItems = function( items, isInstant ) {
  this._emitCompleteOnItems( 'layout', items );

  if ( !items || !items.length ) {
    // no items, emit event with empty array
    return;
  }

  var queue = [];

  items.forEach( function( item ) {
    // get x/y object from method
    var position = this._getItemLayoutPosition( item );
    // enqueue
    position.item = item;
    position.isInstant = isInstant || item.isLayoutInstant;
    queue.push( position );
  }, this );

  this._processLayoutQueue( queue );
};

/**
 * get item layout position
 * @param {Outlayer.Item} item
 * @returns {Object} x and y position
 */
proto._getItemLayoutPosition = function( /* item */ ) {
  return {
    x: 0,
    y: 0
  };
};

/**
 * iterate over array and position each item
 * Reason being - separating this logic prevents 'layout invalidation'
 * thx @paul_irish
 * @param {Array} queue
 */
proto._processLayoutQueue = function( queue ) {
  this.updateStagger();
  queue.forEach( function( obj, i ) {
    this._positionItem( obj.item, obj.x, obj.y, obj.isInstant, i );
  }, this );
};

// set stagger from option in milliseconds number
proto.updateStagger = function() {
  var stagger = this.options.stagger;
  if ( stagger === null || stagger === undefined ) {
    this.stagger = 0;
    return;
  }
  this.stagger = getMilliseconds( stagger );
  return this.stagger;
};

/**
 * Sets position of item in DOM
 * @param {Outlayer.Item} item
 * @param {Number} x - horizontal position
 * @param {Number} y - vertical position
 * @param {Boolean} isInstant - disables transitions
 */
proto._positionItem = function( item, x, y, isInstant, i ) {
  if ( isInstant ) {
    // if not transition, just set CSS
    item.goTo( x, y );
  } else {
    item.stagger( i * this.stagger );
    item.moveTo( x, y );
  }
};

/**
 * Any logic you want to do after each layout,
 * i.e. size the container
 */
proto._postLayout = function() {
  this.resizeContainer();
};

proto.resizeContainer = function() {
  var isResizingContainer = this._getOption('resizeContainer');
  if ( !isResizingContainer ) {
    return;
  }
  var size = this._getContainerSize();
  if ( size ) {
    this._setContainerMeasure( size.width, true );
    this._setContainerMeasure( size.height, false );
  }
};

/**
 * Sets width or height of container if returned
 * @returns {Object} size
 *   @param {Number} width
 *   @param {Number} height
 */
proto._getContainerSize = noop;

/**
 * @param {Number} measure - size of width or height
 * @param {Boolean} isWidth
 */
proto._setContainerMeasure = function( measure, isWidth ) {
  if ( measure === undefined ) {
    return;
  }

  var elemSize = this.size;
  // add padding and border width if border box
  if ( elemSize.isBorderBox ) {
    measure += isWidth ? elemSize.paddingLeft + elemSize.paddingRight +
      elemSize.borderLeftWidth + elemSize.borderRightWidth :
      elemSize.paddingBottom + elemSize.paddingTop +
      elemSize.borderTopWidth + elemSize.borderBottomWidth;
  }

  measure = Math.max( measure, 0 );
  this.element.style[ isWidth ? 'width' : 'height' ] = measure + 'px';
};

/**
 * emit eventComplete on a collection of items events
 * @param {String} eventName
 * @param {Array} items - Outlayer.Items
 */
proto._emitCompleteOnItems = function( eventName, items ) {
  var _this = this;
  function onComplete() {
    _this.dispatchEvent( eventName + 'Complete', null, [ items ] );
  }

  var count = items.length;
  if ( !items || !count ) {
    onComplete();
    return;
  }

  var doneCount = 0;
  function tick() {
    doneCount++;
    if ( doneCount == count ) {
      onComplete();
    }
  }

  // bind callback
  items.forEach( function( item ) {
    item.once( eventName, tick );
  });
};

/**
 * emits events via EvEmitter and jQuery events
 * @param {String} type - name of event
 * @param {Event} event - original event
 * @param {Array} args - extra arguments
 */
proto.dispatchEvent = function( type, event, args ) {
  // add original event to arguments
  var emitArgs = event ? [ event ].concat( args ) : args;
  this.emitEvent( type, emitArgs );

  if ( jQuery ) {
    // set this.$element
    this.$element = this.$element || jQuery( this.element );
    if ( event ) {
      // create jQuery event
      var $event = jQuery.Event( event );
      $event.type = type;
      this.$element.trigger( $event, args );
    } else {
      // just trigger with type if no event available
      this.$element.trigger( type, args );
    }
  }
};

// -------------------------- ignore & stamps -------------------------- //


/**
 * keep item in collection, but do not lay it out
 * ignored items do not get skipped in layout
 * @param {Element} elem
 */
proto.ignore = function( elem ) {
  var item = this.getItem( elem );
  if ( item ) {
    item.isIgnored = true;
  }
};

/**
 * return item to layout collection
 * @param {Element} elem
 */
proto.unignore = function( elem ) {
  var item = this.getItem( elem );
  if ( item ) {
    delete item.isIgnored;
  }
};

/**
 * adds elements to stamps
 * @param {NodeList, Array, Element, or String} elems
 */
proto.stamp = function( elems ) {
  elems = this._find( elems );
  if ( !elems ) {
    return;
  }

  this.stamps = this.stamps.concat( elems );
  // ignore
  elems.forEach( this.ignore, this );
};

/**
 * removes elements to stamps
 * @param {NodeList, Array, or Element} elems
 */
proto.unstamp = function( elems ) {
  elems = this._find( elems );
  if ( !elems ){
    return;
  }

  elems.forEach( function( elem ) {
    // filter out removed stamp elements
    utils.removeFrom( this.stamps, elem );
    this.unignore( elem );
  }, this );
};

/**
 * finds child elements
 * @param {NodeList, Array, Element, or String} elems
 * @returns {Array} elems
 */
proto._find = function( elems ) {
  if ( !elems ) {
    return;
  }
  // if string, use argument as selector string
  if ( typeof elems == 'string' ) {
    elems = this.element.querySelectorAll( elems );
  }
  elems = utils.makeArray( elems );
  return elems;
};

proto._manageStamps = function() {
  if ( !this.stamps || !this.stamps.length ) {
    return;
  }

  this._getBoundingRect();

  this.stamps.forEach( this._manageStamp, this );
};

// update boundingLeft / Top
proto._getBoundingRect = function() {
  // get bounding rect for container element
  var boundingRect = this.element.getBoundingClientRect();
  var size = this.size;
  this._boundingRect = {
    left: boundingRect.left + size.paddingLeft + size.borderLeftWidth,
    top: boundingRect.top + size.paddingTop + size.borderTopWidth,
    right: boundingRect.right - ( size.paddingRight + size.borderRightWidth ),
    bottom: boundingRect.bottom - ( size.paddingBottom + size.borderBottomWidth )
  };
};

/**
 * @param {Element} stamp
**/
proto._manageStamp = noop;

/**
 * get x/y position of element relative to container element
 * @param {Element} elem
 * @returns {Object} offset - has left, top, right, bottom
 */
proto._getElementOffset = function( elem ) {
  var boundingRect = elem.getBoundingClientRect();
  var thisRect = this._boundingRect;
  var size = getSize( elem );
  var offset = {
    left: boundingRect.left - thisRect.left - size.marginLeft,
    top: boundingRect.top - thisRect.top - size.marginTop,
    right: thisRect.right - boundingRect.right - size.marginRight,
    bottom: thisRect.bottom - boundingRect.bottom - size.marginBottom
  };
  return offset;
};

// -------------------------- resize -------------------------- //

// enable event handlers for listeners
// i.e. resize -> onresize
proto.handleEvent = utils.handleEvent;

/**
 * Bind layout to window resizing
 */
proto.bindResize = function() {
  window.addEventListener( 'resize', this );
  this.isResizeBound = true;
};

/**
 * Unbind layout to window resizing
 */
proto.unbindResize = function() {
  window.removeEventListener( 'resize', this );
  this.isResizeBound = false;
};

proto.onresize = function() {
  this.resize();
};

utils.debounceMethod( Outlayer, 'onresize', 100 );

proto.resize = function() {
  // don't trigger if size did not change
  // or if resize was unbound. See #9
  if ( !this.isResizeBound || !this.needsResizeLayout() ) {
    return;
  }

  this.layout();
};

/**
 * check if layout is needed post layout
 * @returns Boolean
 */
proto.needsResizeLayout = function() {
  var size = getSize( this.element );
  // check that this.size and size are there
  // IE8 triggers resize on body size change, so they might not be
  var hasSizes = this.size && size;
  return hasSizes && size.innerWidth !== this.size.innerWidth;
};

// -------------------------- methods -------------------------- //

/**
 * add items to Outlayer instance
 * @param {Array or NodeList or Element} elems
 * @returns {Array} items - Outlayer.Items
**/
proto.addItems = function( elems ) {
  var items = this._itemize( elems );
  // add items to collection
  if ( items.length ) {
    this.items = this.items.concat( items );
  }
  return items;
};

/**
 * Layout newly-appended item elements
 * @param {Array or NodeList or Element} elems
 */
proto.appended = function( elems ) {
  var items = this.addItems( elems );
  if ( !items.length ) {
    return;
  }
  // layout and reveal just the new items
  this.layoutItems( items, true );
  this.reveal( items );
};

/**
 * Layout prepended elements
 * @param {Array or NodeList or Element} elems
 */
proto.prepended = function( elems ) {
  var items = this._itemize( elems );
  if ( !items.length ) {
    return;
  }
  // add items to beginning of collection
  var previousItems = this.items.slice(0);
  this.items = items.concat( previousItems );
  // start new layout
  this._resetLayout();
  this._manageStamps();
  // layout new stuff without transition
  this.layoutItems( items, true );
  this.reveal( items );
  // layout previous items
  this.layoutItems( previousItems );
};

/**
 * reveal a collection of items
 * @param {Array of Outlayer.Items} items
 */
proto.reveal = function( items ) {
  this._emitCompleteOnItems( 'reveal', items );
  if ( !items || !items.length ) {
    return;
  }
  var stagger = this.updateStagger();
  items.forEach( function( item, i ) {
    item.stagger( i * stagger );
    item.reveal();
  });
};

/**
 * hide a collection of items
 * @param {Array of Outlayer.Items} items
 */
proto.hide = function( items ) {
  this._emitCompleteOnItems( 'hide', items );
  if ( !items || !items.length ) {
    return;
  }
  var stagger = this.updateStagger();
  items.forEach( function( item, i ) {
    item.stagger( i * stagger );
    item.hide();
  });
};

/**
 * reveal item elements
 * @param {Array}, {Element}, {NodeList} items
 */
proto.revealItemElements = function( elems ) {
  var items = this.getItems( elems );
  this.reveal( items );
};

/**
 * hide item elements
 * @param {Array}, {Element}, {NodeList} items
 */
proto.hideItemElements = function( elems ) {
  var items = this.getItems( elems );
  this.hide( items );
};

/**
 * get Outlayer.Item, given an Element
 * @param {Element} elem
 * @param {Function} callback
 * @returns {Outlayer.Item} item
 */
proto.getItem = function( elem ) {
  // loop through items to get the one that matches
  for ( var i=0; i < this.items.length; i++ ) {
    var item = this.items[i];
    if ( item.element == elem ) {
      // return item
      return item;
    }
  }
};

/**
 * get collection of Outlayer.Items, given Elements
 * @param {Array} elems
 * @returns {Array} items - Outlayer.Items
 */
proto.getItems = function( elems ) {
  elems = utils.makeArray( elems );
  var items = [];
  elems.forEach( function( elem ) {
    var item = this.getItem( elem );
    if ( item ) {
      items.push( item );
    }
  }, this );

  return items;
};

/**
 * remove element(s) from instance and DOM
 * @param {Array or NodeList or Element} elems
 */
proto.remove = function( elems ) {
  var removeItems = this.getItems( elems );

  this._emitCompleteOnItems( 'remove', removeItems );

  // bail if no items to remove
  if ( !removeItems || !removeItems.length ) {
    return;
  }

  removeItems.forEach( function( item ) {
    item.remove();
    // remove item from collection
    utils.removeFrom( this.items, item );
  }, this );
};

// ----- destroy ----- //

// remove and disable Outlayer instance
proto.destroy = function() {
  // clean up dynamic styles
  var style = this.element.style;
  style.height = '';
  style.position = '';
  style.width = '';
  // destroy items
  this.items.forEach( function( item ) {
    item.destroy();
  });

  this.unbindResize();

  var id = this.element.outlayerGUID;
  delete instances[ id ]; // remove reference to instance by id
  delete this.element.outlayerGUID;
  // remove data for jQuery
  if ( jQuery ) {
    jQuery.removeData( this.element, this.constructor.namespace );
  }

};

// -------------------------- data -------------------------- //

/**
 * get Outlayer instance from element
 * @param {Element} elem
 * @returns {Outlayer}
 */
Outlayer.data = function( elem ) {
  elem = utils.getQueryElement( elem );
  var id = elem && elem.outlayerGUID;
  return id && instances[ id ];
};


// -------------------------- create Outlayer class -------------------------- //

/**
 * create a layout class
 * @param {String} namespace
 */
Outlayer.create = function( namespace, options ) {
  // sub-class Outlayer
  var Layout = subclass( Outlayer );
  // apply new options and compatOptions
  Layout.defaults = utils.extend( {}, Outlayer.defaults );
  utils.extend( Layout.defaults, options );
  Layout.compatOptions = utils.extend( {}, Outlayer.compatOptions  );

  Layout.namespace = namespace;

  Layout.data = Outlayer.data;

  // sub-class Item
  Layout.Item = subclass( Item );

  // -------------------------- declarative -------------------------- //

  utils.htmlInit( Layout, namespace );

  // -------------------------- jQuery bridge -------------------------- //

  // make into jQuery plugin
  if ( jQuery && jQuery.bridget ) {
    jQuery.bridget( namespace, Layout );
  }

  return Layout;
};

function subclass( Parent ) {
  function SubClass() {
    Parent.apply( this, arguments );
  }

  SubClass.prototype = Object.create( Parent.prototype );
  SubClass.prototype.constructor = SubClass;

  return SubClass;
}

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

// how many milliseconds are in each unit
var msUnits = {
  ms: 1,
  s: 1000
};

// munge time-like parameter into millisecond number
// '0.4s' -> 40
function getMilliseconds( time ) {
  if ( typeof time == 'number' ) {
    return time;
  }
  var matches = time.match( /(^\d*\.?\d*)(\w*)/ );
  var num = matches && matches[1];
  var unit = matches && matches[2];
  if ( !num.length ) {
    return 0;
  }
  num = parseFloat( num );
  var mult = msUnits[ unit ] || 1;
  return num * mult;
}

// ----- fin ----- //

// back in global
Outlayer.Item = Item;

return Outlayer;

}));

/**
 * Isotope Item
**/

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /*globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'isotope/js/item',[
        'outlayer/outlayer'
      ],
      factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      require('outlayer')
    );
  } else {
    // browser global
    window.Isotope = window.Isotope || {};
    window.Isotope.Item = factory(
      window.Outlayer
    );
  }

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

// -------------------------- Item -------------------------- //

// sub-class Outlayer Item
function Item() {
  Outlayer.Item.apply( this, arguments );
}

var proto = Item.prototype = Object.create( Outlayer.Item.prototype );

var _create = proto._create;
proto._create = function() {
  // assign id, used for original-order sorting
  this.id = this.layout.itemGUID++;
  _create.call( this );
  this.sortData = {};
};

proto.updateSortData = function() {
  if ( this.isIgnored ) {
    return;
  }
  // default sorters
  this.sortData.id = this.id;
  // for backward compatibility
  this.sortData['original-order'] = this.id;
  this.sortData.random = Math.random();
  // go thru getSortData obj and apply the sorters
  var getSortData = this.layout.options.getSortData;
  var sorters = this.layout._sorters;
  for ( var key in getSortData ) {
    var sorter = sorters[ key ];
    this.sortData[ key ] = sorter( this.element, this );
  }
};

var _destroy = proto.destroy;
proto.destroy = function() {
  // call super
  _destroy.apply( this, arguments );
  // reset display, #741
  this.css({
    display: ''
  });
};

return Item;

}));

/**
 * Isotope LayoutMode
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /*globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'isotope/js/layout-mode',[
        'get-size/get-size',
        'outlayer/outlayer'
      ],
      factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      require('get-size'),
      require('outlayer')
    );
  } else {
    // browser global
    window.Isotope = window.Isotope || {};
    window.Isotope.LayoutMode = factory(
      window.getSize,
      window.Outlayer
    );
  }

}( window, function factory( getSize, Outlayer ) {
  'use strict';

  // layout mode class
  function LayoutMode( isotope ) {
    this.isotope = isotope;
    // link properties
    if ( isotope ) {
      this.options = isotope.options[ this.namespace ];
      this.element = isotope.element;
      this.items = isotope.filteredItems;
      this.size = isotope.size;
    }
  }

  var proto = LayoutMode.prototype;

  /**
   * some methods should just defer to default Outlayer method
   * and reference the Isotope instance as `this`
  **/
  var facadeMethods = [
    '_resetLayout',
    '_getItemLayoutPosition',
    '_manageStamp',
    '_getContainerSize',
    '_getElementOffset',
    'needsResizeLayout',
    '_getOption'
  ];

  facadeMethods.forEach( function( methodName ) {
    proto[ methodName ] = function() {
      return Outlayer.prototype[ methodName ].apply( this.isotope, arguments );
    };
  });

  // -----  ----- //

  // for horizontal layout modes, check vertical size
  proto.needsVerticalResizeLayout = function() {
    // don't trigger if size did not change
    var size = getSize( this.isotope.element );
    // check that this.size and size are there
    // IE8 triggers resize on body size change, so they might not be
    var hasSizes = this.isotope.size && size;
    return hasSizes && size.innerHeight != this.isotope.size.innerHeight;
  };

  // ----- measurements ----- //

  proto._getMeasurement = function() {
    this.isotope._getMeasurement.apply( this, arguments );
  };

  proto.getColumnWidth = function() {
    this.getSegmentSize( 'column', 'Width' );
  };

  proto.getRowHeight = function() {
    this.getSegmentSize( 'row', 'Height' );
  };

  /**
   * get columnWidth or rowHeight
   * segment: 'column' or 'row'
   * size 'Width' or 'Height'
  **/
  proto.getSegmentSize = function( segment, size ) {
    var segmentName = segment + size;
    var outerSize = 'outer' + size;
    // columnWidth / outerWidth // rowHeight / outerHeight
    this._getMeasurement( segmentName, outerSize );
    // got rowHeight or columnWidth, we can chill
    if ( this[ segmentName ] ) {
      return;
    }
    // fall back to item of first element
    var firstItemSize = this.getFirstItemSize();
    this[ segmentName ] = firstItemSize && firstItemSize[ outerSize ] ||
      // or size of container
      this.isotope.size[ 'inner' + size ];
  };

  proto.getFirstItemSize = function() {
    var firstItem = this.isotope.filteredItems[0];
    return firstItem && firstItem.element && getSize( firstItem.element );
  };

  // ----- methods that should reference isotope ----- //

  proto.layout = function() {
    this.isotope.layout.apply( this.isotope, arguments );
  };

  proto.getSize = function() {
    this.isotope.getSize();
    this.size = this.isotope.size;
  };

  // -------------------------- create -------------------------- //

  LayoutMode.modes = {};

  LayoutMode.create = function( namespace, options ) {

    function Mode() {
      LayoutMode.apply( this, arguments );
    }

    Mode.prototype = Object.create( proto );
    Mode.prototype.constructor = Mode;

    // default options
    if ( options ) {
      Mode.options = options;
    }

    Mode.prototype.namespace = namespace;
    // register in Isotope
    LayoutMode.modes[ namespace ] = Mode;

    return Mode;
  };

  return LayoutMode;

}));

/*!
 * Masonry v4.1.0
 * Cascading grid layout library
 * http://masonry.desandro.com
 * MIT License
 * by David DeSandro
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /*globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'masonry/masonry',[
        'outlayer/outlayer',
        'get-size/get-size'
      ],
      factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      require('outlayer'),
      require('get-size')
    );
  } else {
    // browser global
    window.Masonry = factory(
      window.Outlayer,
      window.getSize
    );
  }

}( window, function factory( Outlayer, getSize ) {



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

  // create an Outlayer layout class
  var Masonry = Outlayer.create('masonry');
  // isFitWidth -> fitWidth
  Masonry.compatOptions.fitWidth = 'isFitWidth';

  Masonry.prototype._resetLayout = function() {
    this.getSize();
    this._getMeasurement( 'columnWidth', 'outerWidth' );
    this._getMeasurement( 'gutter', 'outerWidth' );
    this.measureColumns();

    // reset column Y
    this.colYs = [];
    for ( var i=0; i < this.cols; i++ ) {
      this.colYs.push( 0 );
    }

    this.maxY = 0;
  };

  Masonry.prototype.measureColumns = function() {
    this.getContainerWidth();
    // if columnWidth is 0, default to outerWidth of first item
    if ( !this.columnWidth ) {
      var firstItem = this.items[0];
      var firstItemElem = firstItem && firstItem.element;
      // columnWidth fall back to item of first element
      this.columnWidth = firstItemElem && getSize( firstItemElem ).outerWidth ||
        // if first elem has no width, default to size of container
        this.containerWidth;
    }

    var columnWidth = this.columnWidth += this.gutter;

    // calculate columns
    var containerWidth = this.containerWidth + this.gutter;
    var cols = containerWidth / columnWidth;
    // fix rounding errors, typically with gutters
    var excess = columnWidth - containerWidth % columnWidth;
    // if overshoot is less than a pixel, round up, otherwise floor it
    var mathMethod = excess && excess < 1 ? 'round' : 'floor';
    cols = Math[ mathMethod ]( cols );
    this.cols = Math.max( cols, 1 );
  };

  Masonry.prototype.getContainerWidth = function() {
    // container is parent if fit width
    var isFitWidth = this._getOption('fitWidth');
    var container = isFitWidth ? this.element.parentNode : this.element;
    // check that this.size and size are there
    // IE8 triggers resize on body size change, so they might not be
    var size = getSize( container );
    this.containerWidth = size && size.innerWidth;
  };

  Masonry.prototype._getItemLayoutPosition = function( item ) {
    item.getSize();
    // how many columns does this brick span
    var remainder = item.size.outerWidth % this.columnWidth;
    var mathMethod = remainder && remainder < 1 ? 'round' : 'ceil';
    // round if off by 1 pixel, otherwise use ceil
    var colSpan = Math[ mathMethod ]( item.size.outerWidth / this.columnWidth );
    colSpan = Math.min( colSpan, this.cols );

    var colGroup = this._getColGroup( colSpan );
    // get the minimum Y value from the columns
    var minimumY = Math.min.apply( Math, colGroup );
    var shortColIndex = colGroup.indexOf( minimumY );

    // position the brick
    var position = {
      x: this.columnWidth * shortColIndex,
      y: minimumY
    };

    // apply setHeight to necessary columns
    var setHeight = minimumY + item.size.outerHeight;
    var setSpan = this.cols + 1 - colGroup.length;
    for ( var i = 0; i < setSpan; i++ ) {
      this.colYs[ shortColIndex + i ] = setHeight;
    }

    return position;
  };

  /**
   * @param {Number} colSpan - number of columns the element spans
   * @returns {Array} colGroup
   */
  Masonry.prototype._getColGroup = function( colSpan ) {
    if ( colSpan < 2 ) {
      // if brick spans only one column, use all the column Ys
      return this.colYs;
    }

    var colGroup = [];
    // how many different places could this brick fit horizontally
    var groupCount = this.cols + 1 - colSpan;
    // for each group potential horizontal position
    for ( var i = 0; i < groupCount; i++ ) {
      // make an array of colY values for that one group
      var groupColYs = this.colYs.slice( i, i + colSpan );
      // and get the max value of the array
      colGroup[i] = Math.max.apply( Math, groupColYs );
    }
    return colGroup;
  };

  Masonry.prototype._manageStamp = function( stamp ) {
    var stampSize = getSize( stamp );
    var offset = this._getElementOffset( stamp );
    // get the columns that this stamp affects
    var isOriginLeft = this._getOption('originLeft');
    var firstX = isOriginLeft ? offset.left : offset.right;
    var lastX = firstX + stampSize.outerWidth;
    var firstCol = Math.floor( firstX / this.columnWidth );
    firstCol = Math.max( 0, firstCol );
    var lastCol = Math.floor( lastX / this.columnWidth );
    // lastCol should not go over if multiple of columnWidth #425
    lastCol -= lastX % this.columnWidth ? 0 : 1;
    lastCol = Math.min( this.cols - 1, lastCol );
    // set colYs to bottom of the stamp

    var isOriginTop = this._getOption('originTop');
    var stampMaxY = ( isOriginTop ? offset.top : offset.bottom ) +
      stampSize.outerHeight;
    for ( var i = firstCol; i <= lastCol; i++ ) {
      this.colYs[i] = Math.max( stampMaxY, this.colYs[i] );
    }
  };

  Masonry.prototype._getContainerSize = function() {
    this.maxY = Math.max.apply( Math, this.colYs );
    var size = {
      height: this.maxY
    };

    if ( this._getOption('fitWidth') ) {
      size.width = this._getContainerFitWidth();
    }

    return size;
  };

  Masonry.prototype._getContainerFitWidth = function() {
    var unusedCols = 0;
    // count unused columns
    var i = this.cols;
    while ( --i ) {
      if ( this.colYs[i] !== 0 ) {
        break;
      }
      unusedCols++;
    }
    // fit container to columns that have been used
    return ( this.cols - unusedCols ) * this.columnWidth - this.gutter;
  };

  Masonry.prototype.needsResizeLayout = function() {
    var previousWidth = this.containerWidth;
    this.getContainerWidth();
    return previousWidth != this.containerWidth;
  };

  return Masonry;

}));

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

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /*globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'isotope/js/layout-modes/masonry',[
        '../layout-mode',
        'masonry/masonry'
      ],
      factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // 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';

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

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

  var proto = MasonryMode.prototype;

  var keepModeMethods = {
    _getElementOffset: true,
    layout: true,
    _getMeasurement: true
  };

  // inherit Masonry prototype
  for ( var method in Masonry.prototype ) {
    // do not inherit mode methods
    if ( !keepModeMethods[ method ] ) {
      proto[ method ] = Masonry.prototype[ method ];
    }
  }

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

  // point to mode options for fitWidth
  var _getOption = proto._getOption;
  proto._getOption = function( option ) {
    if ( option == 'fitWidth' ) {
      return this.options.isFitWidth !== undefined ?
        this.options.isFitWidth : this.options.fitWidth;
    }
    return _getOption.apply( this.isotope, arguments );
  };

  return MasonryMode;

}));

/**
 * fitRows layout mode
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /*globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'isotope/js/layout-modes/fit-rows',[
        '../layout-mode'
      ],
      factory );
  } else if ( typeof exports == 'object' ) {
    // CommonJS
    module.exports = factory(
      require('../layout-mode')
    );
  } else {
    // browser global
    factory(
      window.Isotope.LayoutMode
    );
  }

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

var FitRows = LayoutMode.create('fitRows');

var proto = FitRows.prototype;

proto._resetLayout = function() {
  this.x = 0;
  this.y = 0;
  this.maxY = 0;
  this._getMeasurement( 'gutter', 'outerWidth' );
};

proto._getItemLayoutPosition = function( item ) {
  item.getSize();

  var itemWidth = item.size.outerWidth + this.gutter;
  // if this element cannot fit in the current row
  var containerWidth = this.isotope.size.innerWidth + this.gutter;
  if ( this.x !== 0 && itemWidth + this.x > containerWidth ) {
    this.x = 0;
    this.y = this.maxY;
  }

  var position = {
    x: this.x,
    y: this.y
  };

  this.maxY = Math.max( this.maxY, this.y + item.size.outerHeight );
  this.x += itemWidth;

  return position;
};

proto._getContainerSize = function() {
  return { height: this.maxY };
};

return FitRows;

}));

/**
 * vertical layout mode
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /*globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'isotope/js/layout-modes/vertical',[
        '../layout-mode'
      ],
      factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      require('../layout-mode')
    );
  } else {
    // browser global
    factory(
      window.Isotope.LayoutMode
    );
  }

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

var Vertical = LayoutMode.create( 'vertical', {
  horizontalAlignment: 0
});

var proto = Vertical.prototype;

proto._resetLayout = function() {
  this.y = 0;
};

proto._getItemLayoutPosition = function( item ) {
  item.getSize();
  var x = ( this.isotope.size.innerWidth - item.size.outerWidth ) *
    this.options.horizontalAlignment;
  var y = this.y;
  this.y += item.size.outerHeight;
  return { x: x, y: y };
};

proto._getContainerSize = function() {
  return { height: this.y };
};

return Vertical;

}));

/*!
 * Isotope v3.0.1
 *
 * Licensed GPLv3 for open source use
 * or Isotope Commercial License for commercial use
 *
 * http://isotope.metafizzy.co
 * Copyright 2016 Metafizzy
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /*globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( [
        'outlayer/outlayer',
        'get-size/get-size',
        'desandro-matches-selector/matches-selector',
        'fizzy-ui-utils/utils',
        'isotope/js/item',
        'isotope/js/layout-mode',
        // include default layout modes
        'isotope/js/layout-modes/masonry',
        'isotope/js/layout-modes/fit-rows',
        'isotope/js/layout-modes/vertical'
      ],
      function( Outlayer, getSize, matchesSelector, utils, Item, LayoutMode ) {
        return factory( window, Outlayer, getSize, matchesSelector, utils, Item, LayoutMode );
      });
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      window,
      require('outlayer'),
      require('get-size'),
      require('desandro-matches-selector'),
      require('fizzy-ui-utils'),
      require('isotope/js/item'),
      require('isotope/js/layout-mode'),
      // include default layout modes
      require('isotope/js/layout-modes/masonry'),
      require('isotope/js/layout-modes/fit-rows'),
      require('isotope/js/layout-modes/vertical')
    );
  } else {
    // browser global
    window.Isotope = factory(
      window,
      window.Outlayer,
      window.getSize,
      window.matchesSelector,
      window.fizzyUIUtils,
      window.Isotope.Item,
      window.Isotope.LayoutMode
    );
  }

}( window, function factory( window, Outlayer, getSize, matchesSelector, utils,
  Item, LayoutMode ) {



// -------------------------- vars -------------------------- //

var jQuery = window.jQuery;

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

var trim = String.prototype.trim ?
  function( str ) {
    return str.trim();
  } :
  function( str ) {
    return str.replace( /^\s+|\s+$/g, '' );
  };

// -------------------------- isotopeDefinition -------------------------- //

  // create an Outlayer layout class
  var Isotope = Outlayer.create( 'isotope', {
    layoutMode: 'masonry',
    isJQueryFiltering: true,
    sortAscending: true
  });

  Isotope.Item = Item;
  Isotope.LayoutMode = LayoutMode;

  var proto = Isotope.prototype;

  proto._create = function() {
    this.itemGUID = 0;
    // functions that sort items
    this._sorters = {};
    this._getSorters();
    // call super
    Outlayer.prototype._create.call( this );

    // create layout modes
    this.modes = {};
    // start filteredItems with all items
    this.filteredItems = this.items;
    // keep of track of sortBys
    this.sortHistory = [ 'original-order' ];
    // create from registered layout modes
    for ( var name in LayoutMode.modes ) {
      this._initLayoutMode( name );
    }
  };

  proto.reloadItems = function() {
    // reset item ID counter
    this.itemGUID = 0;
    // call super
    Outlayer.prototype.reloadItems.call( this );
  };

  proto._itemize = function() {
    var items = Outlayer.prototype._itemize.apply( this, arguments );
    // assign ID for original-order
    for ( var i=0; i < items.length; i++ ) {
      var item = items[i];
      item.id = this.itemGUID++;
    }
    this._updateItemsSortData( items );
    return items;
  };


  // -------------------------- layout -------------------------- //

  proto._initLayoutMode = function( name ) {
    var Mode = LayoutMode.modes[ name ];
    // set mode options
    // HACK extend initial options, back-fill in default options
    var initialOpts = this.options[ name ] || {};
    this.options[ name ] = Mode.options ?
      utils.extend( Mode.options, initialOpts ) : initialOpts;
    // init layout mode instance
    this.modes[ name ] = new Mode( this );
  };


  proto.layout = function() {
    // if first time doing layout, do all magic
    if ( !this._isLayoutInited && this._getOption('initLayout') ) {
      this.arrange();
      return;
    }
    this._layout();
  };

  // private method to be used in layout() & magic()
  proto._layout = function() {
    // don't animate first layout
    var isInstant = this._getIsInstant();
    // layout flow
    this._resetLayout();
    this._manageStamps();
    this.layoutItems( this.filteredItems, isInstant );

    // flag for initalized
    this._isLayoutInited = true;
  };

  // filter + sort + layout
  proto.arrange = function( opts ) {
    // set any options pass
    this.option( opts );
    this._getIsInstant();
    // filter, sort, and layout

    // filter
    var filtered = this._filter( this.items );
    this.filteredItems = filtered.matches;

    this._bindArrangeComplete();

    if ( this._isInstant ) {
      this._noTransition( this._hideReveal, [ filtered ] );
    } else {
      this._hideReveal( filtered );
    }

    this._sort();
    this._layout();
  };
  // alias to _init for main plugin method
  proto._init = proto.arrange;

  proto._hideReveal = function( filtered ) {
    this.reveal( filtered.needReveal );
    this.hide( filtered.needHide );
  };

  // HACK
  // Don't animate/transition first layout
  // Or don't animate/transition other layouts
  proto._getIsInstant = function() {
    var isLayoutInstant = this._getOption('layoutInstant');
    var isInstant = isLayoutInstant !== undefined ? isLayoutInstant :
      !this._isLayoutInited;
    this._isInstant = isInstant;
    return isInstant;
  };

  // listen for layoutComplete, hideComplete and revealComplete
  // to trigger arrangeComplete
  proto._bindArrangeComplete = function() {
    // listen for 3 events to trigger arrangeComplete
    var isLayoutComplete, isHideComplete, isRevealComplete;
    var _this = this;
    function arrangeParallelCallback() {
      if ( isLayoutComplete && isHideComplete && isRevealComplete ) {
        _this.dispatchEvent( 'arrangeComplete', null, [ _this.filteredItems ] );
      }
    }
    this.once( 'layoutComplete', function() {
      isLayoutComplete = true;
      arrangeParallelCallback();
    });
    this.once( 'hideComplete', function() {
      isHideComplete = true;
      arrangeParallelCallback();
    });
    this.once( 'revealComplete', function() {
      isRevealComplete = true;
      arrangeParallelCallback();
    });
  };

  // -------------------------- filter -------------------------- //

  proto._filter = function( items ) {
    var filter = this.options.filter;
    filter = filter || '*';
    var matches = [];
    var hiddenMatched = [];
    var visibleUnmatched = [];

    var test = this._getFilterTest( filter );

    // test each item
    for ( var i=0; i < items.length; i++ ) {
      var item = items[i];
      if ( item.isIgnored ) {
        continue;
      }
      // add item to either matched or unmatched group
      var isMatched = test( item );
      // item.isFilterMatched = isMatched;
      // add to matches if its a match
      if ( isMatched ) {
        matches.push( item );
      }
      // add to additional group if item needs to be hidden or revealed
      if ( isMatched && item.isHidden ) {
        hiddenMatched.push( item );
      } else if ( !isMatched && !item.isHidden ) {
        visibleUnmatched.push( item );
      }
    }

    // return collections of items to be manipulated
    return {
      matches: matches,
      needReveal: hiddenMatched,
      needHide: visibleUnmatched
    };
  };

  // get a jQuery, function, or a matchesSelector test given the filter
  proto._getFilterTest = function( filter ) {
    if ( jQuery && this.options.isJQueryFiltering ) {
      // use jQuery
      return function( item ) {
        return jQuery( item.element ).is( filter );
      };
    }
    if ( typeof filter == 'function' ) {
      // use filter as function
      return function( item ) {
        return filter( item.element );
      };
    }
    // default, use filter as selector string
    return function( item ) {
      return matchesSelector( item.element, filter );
    };
  };

  // -------------------------- sorting -------------------------- //

  /**
   * @params {Array} elems
   * @public
   */
  proto.updateSortData = function( elems ) {
    // get items
    var items;
    if ( elems ) {
      elems = utils.makeArray( elems );
      items = this.getItems( elems );
    } else {
      // update all items if no elems provided
      items = this.items;
    }

    this._getSorters();
    this._updateItemsSortData( items );
  };

  proto._getSorters = function() {
    var getSortData = this.options.getSortData;
    for ( var key in getSortData ) {
      var sorter = getSortData[ key ];
      this._sorters[ key ] = mungeSorter( sorter );
    }
  };

  /**
   * @params {Array} items - of Isotope.Items
   * @private
   */
  proto._updateItemsSortData = function( items ) {
    // do not update if no items
    var len = items && items.length;

    for ( var i=0; len && i < len; i++ ) {
      var item = items[i];
      item.updateSortData();
    }
  };

  // ----- munge sorter ----- //

  // encapsulate this, as we just need mungeSorter
  // other functions in here are just for munging
  var mungeSorter = ( function() {
    // add a magic layer to sorters for convienent shorthands
    // `.foo-bar` will use the text of .foo-bar querySelector
    // `[foo-bar]` will use attribute
    // you can also add parser
    // `.foo-bar parseInt` will parse that as a number
    function mungeSorter( sorter ) {
      // if not a string, return function or whatever it is
      if ( typeof sorter != 'string' ) {
        return sorter;
      }
      // parse the sorter string
      var args = trim( sorter ).split(' ');
      var query = args[0];
      // check if query looks like [an-attribute]
      var attrMatch = query.match( /^\[(.+)\]$/ );
      var attr = attrMatch && attrMatch[1];
      var getValue = getValueGetter( attr, query );
      // use second argument as a parser
      var parser = Isotope.sortDataParsers[ args[1] ];
      // parse the value, if there was a parser
      sorter = parser ? function( elem ) {
        return elem && parser( getValue( elem ) );
      } :
      // otherwise just return value
      function( elem ) {
        return elem && getValue( elem );
      };

      return sorter;
    }

    // get an attribute getter, or get text of the querySelector
    function getValueGetter( attr, query ) {
      // if query looks like [foo-bar], get attribute
      if ( attr ) {
        return function getAttribute( elem ) {
          return elem.getAttribute( attr );
        };
      }

      // otherwise, assume its a querySelector, and get its text
      return function getChildText( elem ) {
        var child = elem.querySelector( query );
        return child && child.textContent;
      };
    }

    return mungeSorter;
  })();

  // parsers used in getSortData shortcut strings
  Isotope.sortDataParsers = {
    'parseInt': function( val ) {
      return parseInt( val, 10 );
    },
    'parseFloat': function( val ) {
      return parseFloat( val );
    }
  };

  // ----- sort method ----- //

  // sort filteredItem order
  proto._sort = function() {
    var sortByOpt = this.options.sortBy;
    if ( !sortByOpt ) {
      return;
    }
    // concat all sortBy and sortHistory
    var sortBys = [].concat.apply( sortByOpt, this.sortHistory );
    // sort magic
    var itemSorter = getItemSorter( sortBys, this.options.sortAscending );
    this.filteredItems.sort( itemSorter );
    // keep track of sortBy History
    if ( sortByOpt != this.sortHistory[0] ) {
      // add to front, oldest goes in last
      this.sortHistory.unshift( sortByOpt );
    }
  };

  // returns a function used for sorting
  function getItemSorter( sortBys, sortAsc ) {
    return function sorter( itemA, itemB ) {
      // cycle through all sortKeys
      for ( var i = 0; i < sortBys.length; i++ ) {
        var sortBy = sortBys[i];
        var a = itemA.sortData[ sortBy ];
        var b = itemB.sortData[ sortBy ];
        if ( a > b || a < b ) {
          // if sortAsc is an object, use the value given the sortBy key
          var isAscending = sortAsc[ sortBy ] !== undefined ? sortAsc[ sortBy ] : sortAsc;
          var direction = isAscending ? 1 : -1;
          return ( a > b ? 1 : -1 ) * direction;
        }
      }
      return 0;
    };
  }

  // -------------------------- methods -------------------------- //

  // get layout mode
  proto._mode = function() {
    var layoutMode = this.options.layoutMode;
    var mode = this.modes[ layoutMode ];
    if ( !mode ) {
      // TODO console.error
      throw new Error( 'No layout mode: ' + layoutMode );
    }
    // HACK sync mode's options
    // any options set after init for layout mode need to be synced
    mode.options = this.options[ layoutMode ];
    return mode;
  };

  proto._resetLayout = function() {
    // trigger original reset layout
    Outlayer.prototype._resetLayout.call( this );
    this._mode()._resetLayout();
  };

  proto._getItemLayoutPosition = function( item  ) {
    return this._mode()._getItemLayoutPosition( item );
  };

  proto._manageStamp = function( stamp ) {
    this._mode()._manageStamp( stamp );
  };

  proto._getContainerSize = function() {
    return this._mode()._getContainerSize();
  };

  proto.needsResizeLayout = function() {
    return this._mode().needsResizeLayout();
  };

  // -------------------------- adding & removing -------------------------- //

  // HEADS UP overwrites default Outlayer appended
  proto.appended = function( elems ) {
    var items = this.addItems( elems );
    if ( !items.length ) {
      return;
    }
    // filter, layout, reveal new items
    var filteredItems = this._filterRevealAdded( items );
    // add to filteredItems
    this.filteredItems = this.filteredItems.concat( filteredItems );
  };

  // HEADS UP overwrites default Outlayer prepended
  proto.prepended = function( elems ) {
    var items = this._itemize( elems );
    if ( !items.length ) {
      return;
    }
    // start new layout
    this._resetLayout();
    this._manageStamps();
    // filter, layout, reveal new items
    var filteredItems = this._filterRevealAdded( items );
    // layout previous items
    this.layoutItems( this.filteredItems );
    // add to items and filteredItems
    this.filteredItems = filteredItems.concat( this.filteredItems );
    this.items = items.concat( this.items );
  };

  proto._filterRevealAdded = function( items ) {
    var filtered = this._filter( items );
    this.hide( filtered.needHide );
    // reveal all new items
    this.reveal( filtered.matches );
    // layout new items, no transition
    this.layoutItems( filtered.matches, true );
    return filtered.matches;
  };

  /**
   * Filter, sort, and layout newly-appended item elements
   * @param {Array or NodeList or Element} elems
   */
  proto.insert = function( elems ) {
    var items = this.addItems( elems );
    if ( !items.length ) {
      return;
    }
    // append item elements
    var i, item;
    var len = items.length;
    for ( i=0; i < len; i++ ) {
      item = items[i];
      this.element.appendChild( item.element );
    }
    // filter new stuff
    var filteredInsertItems = this._filter( items ).matches;
    // set flag
    for ( i=0; i < len; i++ ) {
      items[i].isLayoutInstant = true;
    }
    this.arrange();
    // reset flag
    for ( i=0; i < len; i++ ) {
      delete items[i].isLayoutInstant;
    }
    this.reveal( filteredInsertItems );
  };

  var _remove = proto.remove;
  proto.remove = function( elems ) {
    elems = utils.makeArray( elems );
    var removeItems = this.getItems( elems );
    // do regular thing
    _remove.call( this, elems );
    // bail if no items to remove
    var len = removeItems && removeItems.length;
    // remove elems from filteredItems
    for ( var i=0; len && i < len; i++ ) {
      var item = removeItems[i];
      // remove item from collection
      utils.removeFrom( this.filteredItems, item );
    }
  };

  proto.shuffle = function() {
    // update random sortData
    for ( var i=0; i < this.items.length; i++ ) {
      var item = this.items[i];
      item.sortData.random = Math.random();
    }
    this.options.sortBy = 'random';
    this._sort();
    this._layout();
  };

  /**
   * trigger fn without transition
   * kind of hacky to have this in the first place
   * @param {Function} fn
   * @param {Array} args
   * @returns ret
   * @private
   */
  proto._noTransition = function( fn, args ) {
    // save transitionDuration before disabling
    var transitionDuration = this.options.transitionDuration;
    // disable transition
    this.options.transitionDuration = 0;
    // do it
    var returnValue = fn.apply( this, args );
    // re-enable transition for reveal
    this.options.transitionDuration = transitionDuration;
    return returnValue;
  };

  // ----- helper methods ----- //

  /**
   * getter method for getting filtered item elements
   * @returns {Array} elems - collection of item elements
   */
  proto.getFilteredItemElements = function() {
    return this.filteredItems.map( function( item ) {
      return item.element;
    });
  };

  // -----  ----- //

  return Isotope;

}));