/*!
 * Packery PACKAGED v2.1.2
 * Gapless, draggable grid layouts
 *
 * Licensed GPLv3 for open source use
 * or Packery Commercial License for commercial use
 *
 * http://packery.metafizzy.co
 * Copyright 2013-2018 Metafizzy
 */

/**
 * Bridget makes jQuery widgets
 * v2.0.1
 * MIT license
 */

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

( function( window, factory ) {
    // universal module definition
    /*jshint strict: false */ /* globals define, module, require */
    if ( typeof define == 'function' && define.amd ) {
        // AMD
        define( 'jquery-bridget/jquery-bridget',[ 'jquery' ], function( jQuery ) {
            return 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;

}));

/*!
 * getSize v2.0.3
 * measure size of elements
 * MIT license
 */

/* jshint browser: true, strict: true, undef: true, unused: true */
/* globals console: false */

( function( window, factory ) {
    /* jshint strict: false */ /* globals define, module */
    if ( typeof define == 'function' && define.amd ) {
        // AMD
        define( 'get-size/get-size',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 https://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 -------------------------- //

        /**
         * Chrome & Safari measure the outer-width on style.width on border-box elems
         * IE11 & 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 );
        // round value for browser zoom. desandro/masonry#928
        isBoxSizeOuter = Math.round( getStyleSize( style.width ) ) == 200;
        getSize.isBoxSizeOuter = isBoxSizeOuter;

        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;

});

/**
 * EvEmitter v1.1.0
 * 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;
        }
        // copy over to avoid interference if .off() in listener
        listeners = listeners.slice(0);
        args = args || [];
        // once stuff
        var onceListeners = this._onceEvents && this._onceEvents[ eventName ];

        for ( var i=0; i < listeners.length; i++ ) {
            var listener = listeners[i]
            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 );
        }

        return this;
    };

    proto.allOff = function() {
        delete this._events;
        delete this._onceEvents;
    };

    return EvEmitter;

}));

/**
 * matchesSelector v2.0.2
 * 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 = window.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 v2.0.7
 * 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 ----- //

    var arraySlice = Array.prototype.slice;

// turn element or nodeList into an array
    utils.makeArray = function( obj ) {
        if ( Array.isArray( obj ) ) {
            // use object if already an array
            return obj;
        }
        // return empty array if undefined or null. #6
        if ( obj === null || obj === undefined ) {
            return [];
        }

        var isArrayLike = typeof obj == 'object' && typeof obj.length == 'number';
        if ( isArrayLike ) {
            // convert nodeList to array
            return arraySlice.call( obj );
        }

        // array of single index
        return [ obj ];
    };

// ----- 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.parentNode && 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 ) {
        threshold = threshold || 100;
        // original method
        var method = _class.prototype[ methodName ];
        var timeoutName = methodName + 'Timeout';

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

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

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

    utils.docReady = function( callback ) {
        var readyState = document.readyState;
        if ( readyState == 'complete' || readyState == 'interactive' ) {
            // do async to allow for other scripts to run. metafizzy/flickity#441
            setTimeout( 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('namespace')
                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' ];
        var x = parseFloat( xValue );
        var y = parseFloat( yValue );
        // convert percent to pixels
        var layoutSize = this.layout.size;
        if ( xValue.indexOf('%') != -1 ) {
            x = ( x / 100 ) * layoutSize.width;
        }
        if ( yValue.indexOf('%') != -1 ) {
            y = ( y / 100 ) * layoutSize.height;
        }
        // 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 didNotMove = x == this.position.x && y == 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 = parseFloat( x );
        this.position.y = parseFloat( y );
    };

// ----- 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 v2.1.1
 * 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;

}));

/**
 * Rect
 * low-level utility class for basic geometry
 */

( function( window, factory ) {
    // universal module definition
    /* jshint strict: false */ /* globals define, module */
    if ( typeof define == 'function' && define.amd ) {
        // AMD
        define( 'packery/js/rect',factory );
    } else if ( typeof module == 'object' && module.exports ) {
        // CommonJS
        module.exports = factory();
    } else {
        // browser global
        window.Packery = window.Packery || {};
        window.Packery.Rect = factory();
    }

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

// -------------------------- Rect -------------------------- //

    function Rect( props ) {
        // extend properties from defaults
        for ( var prop in Rect.defaults ) {
            this[ prop ] = Rect.defaults[ prop ];
        }

        for ( prop in props ) {
            this[ prop ] = props[ prop ];
        }

    }

    Rect.defaults = {
        x: 0,
        y: 0,
        width: 0,
        height: 0
    };

    var proto = Rect.prototype;

    /**
     * Determines whether or not this rectangle wholly encloses another rectangle or point.
     * @param {Rect} rect
     * @returns {Boolean}
     **/
    proto.contains = function( rect ) {
        // points don't have width or height
        var otherWidth = rect.width || 0;
        var otherHeight = rect.height || 0;
        return this.x <= rect.x &&
            this.y <= rect.y &&
            this.x + this.width >= rect.x + otherWidth &&
            this.y + this.height >= rect.y + otherHeight;
    };

    /**
     * Determines whether or not the rectangle intersects with another.
     * @param {Rect} rect
     * @returns {Boolean}
     **/
    proto.overlaps = function( rect ) {
        var thisRight = this.x + this.width;
        var thisBottom = this.y + this.height;
        var rectRight = rect.x + rect.width;
        var rectBottom = rect.y + rect.height;

        // http://stackoverflow.com/a/306332
        return this.x < rectRight &&
            thisRight > rect.x &&
            this.y < rectBottom &&
            thisBottom > rect.y;
    };

    /**
     * @param {Rect} rect - the overlapping rect
     * @returns {Array} freeRects - rects representing the area around the rect
     **/
    proto.getMaximalFreeRects = function( rect ) {

        // if no intersection, return false
        if ( !this.overlaps( rect ) ) {
            return false;
        }

        var freeRects = [];
        var freeRect;

        var thisRight = this.x + this.width;
        var thisBottom = this.y + this.height;
        var rectRight = rect.x + rect.width;
        var rectBottom = rect.y + rect.height;

        // top
        if ( this.y < rect.y ) {
            freeRect = new Rect({
                x: this.x,
                y: this.y,
                width: this.width,
                height: rect.y - this.y
            });
            freeRects.push( freeRect );
        }

        // right
        if ( thisRight > rectRight ) {
            freeRect = new Rect({
                x: rectRight,
                y: this.y,
                width: thisRight - rectRight,
                height: this.height
            });
            freeRects.push( freeRect );
        }

        // bottom
        if ( thisBottom > rectBottom ) {
            freeRect = new Rect({
                x: this.x,
                y: rectBottom,
                width: this.width,
                height: thisBottom - rectBottom
            });
            freeRects.push( freeRect );
        }

        // left
        if ( this.x < rect.x ) {
            freeRect = new Rect({
                x: this.x,
                y: this.y,
                width: rect.x - this.x,
                height: this.height
            });
            freeRects.push( freeRect );
        }

        return freeRects;
    };

    proto.canFit = function( rect ) {
        return this.width >= rect.width && this.height >= rect.height;
    };

    return Rect;

}));

/**
 * Packer
 * bin-packing algorithm
 */

( function( window, factory ) {
    // universal module definition
    /* jshint strict: false */ /* globals define, module, require */
    if ( typeof define == 'function' && define.amd ) {
        // AMD
        define( 'packery/js/packer',[ './rect' ], factory );
    } else if ( typeof module == 'object' && module.exports ) {
        // CommonJS
        module.exports = factory(
            require('./rect')
        );
    } else {
        // browser global
        var Packery = window.Packery = window.Packery || {};
        Packery.Packer = factory( Packery.Rect );
    }

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

// -------------------------- Packer -------------------------- //

    /**
     * @param {Number} width
     * @param {Number} height
     * @param {String} sortDirection
     *   topLeft for vertical, leftTop for horizontal
     */
    function Packer( width, height, sortDirection ) {
        this.width = width || 0;
        this.height = height || 0;
        this.sortDirection = sortDirection || 'downwardLeftToRight';

        this.reset();
    }

    var proto = Packer.prototype;

    proto.reset = function() {
        this.spaces = [];

        var initialSpace = new Rect({
            x: 0,
            y: 0,
            width: this.width,
            height: this.height
        });

        this.spaces.push( initialSpace );
        // set sorter
        this.sorter = sorters[ this.sortDirection ] || sorters.downwardLeftToRight;
    };

// change x and y of rect to fit with in Packer's available spaces
    proto.pack = function( rect ) {
        for ( var i=0; i < this.spaces.length; i++ ) {
            var space = this.spaces[i];
            if ( space.canFit( rect ) ) {
                this.placeInSpace( rect, space );
                break;
            }
        }
    };

    proto.columnPack = function( rect ) {
        for ( var i=0; i < this.spaces.length; i++ ) {
            var space = this.spaces[i];
            var canFitInSpaceColumn = space.x <= rect.x &&
                space.x + space.width >= rect.x + rect.width &&
                space.height >= rect.height - 0.01; // fudge number for rounding error
            if ( canFitInSpaceColumn ) {
                rect.y = space.y;
                this.placed( rect );
                break;
            }
        }
    };

    proto.rowPack = function( rect ) {
        for ( var i=0; i < this.spaces.length; i++ ) {
            var space = this.spaces[i];
            var canFitInSpaceRow = space.y <= rect.y &&
                space.y + space.height >= rect.y + rect.height &&
                space.width >= rect.width - 0.01; // fudge number for rounding error
            if ( canFitInSpaceRow ) {
                rect.x = space.x;
                this.placed( rect );
                break;
            }
        }
    };

    proto.placeInSpace = function( rect, space ) {
        // place rect in space
        rect.x = space.x;
        rect.y = space.y;

        this.placed( rect );
    };

// update spaces with placed rect
    proto.placed = function( rect ) {
        // update spaces
        var revisedSpaces = [];
        for ( var i=0; i < this.spaces.length; i++ ) {
            var space = this.spaces[i];
            var newSpaces = space.getMaximalFreeRects( rect );
            // add either the original space or the new spaces to the revised spaces
            if ( newSpaces ) {
                revisedSpaces.push.apply( revisedSpaces, newSpaces );
            } else {
                revisedSpaces.push( space );
            }
        }

        this.spaces = revisedSpaces;

        this.mergeSortSpaces();
    };

    proto.mergeSortSpaces = function() {
        // remove redundant spaces
        Packer.mergeRects( this.spaces );
        this.spaces.sort( this.sorter );
    };

// add a space back
    proto.addSpace = function( rect ) {
        this.spaces.push( rect );
        this.mergeSortSpaces();
    };

// -------------------------- utility functions -------------------------- //

    /**
     * Remove redundant rectangle from array of rectangles
     * @param {Array} rects: an array of Rects
     * @returns {Array} rects: an array of Rects
     **/
    Packer.mergeRects = function( rects ) {
        var i = 0;
        var rect = rects[i];

        rectLoop:
            while ( rect ) {
                var j = 0;
                var compareRect = rects[ i + j ];

                while ( compareRect ) {
                    if  ( compareRect == rect ) {
                        j++; // next
                    } else if ( compareRect.contains( rect ) ) {
                        // remove rect
                        rects.splice( i, 1 );
                        rect = rects[i]; // set next rect
                        continue rectLoop; // bail on compareLoop
                    } else if ( rect.contains( compareRect ) ) {
                        // remove compareRect
                        rects.splice( i + j, 1 );
                    } else {
                        j++;
                    }
                    compareRect = rects[ i + j ]; // set next compareRect
                }
                i++;
                rect = rects[i];
            }

        return rects;
    };


// -------------------------- sorters -------------------------- //

// functions for sorting rects in order
    var sorters = {
        // top down, then left to right
        downwardLeftToRight: function( a, b ) {
            return a.y - b.y || a.x - b.x;
        },
        // left to right, then top down
        rightwardTopToBottom: function( a, b ) {
            return a.x - b.x || a.y - b.y;
        }
    };


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

    return Packer;

}));

/**
 * Packery Item Element
 **/

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

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

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

    var docElemStyle = document.documentElement.style;

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

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

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

    var __create = proto._create;
    proto._create = function() {
        // call default _create logic
        __create.call( this );
        this.rect = new Rect();
    };

    var _moveTo = proto.moveTo;
    proto.moveTo = function( x, y ) {
        // don't shift 1px while dragging
        var dx = Math.abs( this.position.x - x );
        var dy = Math.abs( this.position.y - y );

        var canHackGoTo = this.layout.dragItemCount && !this.isPlacing &&
            !this.isTransitioning && dx < 1 && dy < 1;
        if ( canHackGoTo ) {
            this.goTo( x, y );
            return;
        }
        _moveTo.apply( this, arguments );
    };

// -------------------------- placing -------------------------- //

    proto.enablePlacing = function() {
        this.removeTransitionStyles();
        // remove transform property from transition
        if ( this.isTransitioning && transformProperty ) {
            this.element.style[ transformProperty ] = 'none';
        }
        this.isTransitioning = false;
        this.getSize();
        this.layout._setRectSize( this.element, this.rect );
        this.isPlacing = true;
    };

    proto.disablePlacing = function() {
        this.isPlacing = false;
    };

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

// remove element from DOM
    proto.removeElem = function() {
        var parent = this.element.parentNode;
        if ( parent ) {
            parent.removeChild( this.element );
        }
        // add space back to packer
        this.layout.packer.addSpace( this.rect );
        this.emitEvent( 'remove', [ this ] );
    };

// ----- dropPlaceholder ----- //

    proto.showDropPlaceholder = function() {
        var dropPlaceholder = this.dropPlaceholder;
        if ( !dropPlaceholder ) {
            // create dropPlaceholder
            dropPlaceholder = this.dropPlaceholder = document.createElement('div');
            dropPlaceholder.className = 'packery-drop-placeholder';
            dropPlaceholder.style.position = 'absolute';
        }

        dropPlaceholder.style.width = this.size.width + 'px';
        dropPlaceholder.style.height = this.size.height + 'px';
        this.positionDropPlaceholder();
        this.layout.element.appendChild( dropPlaceholder );
    };

    proto.positionDropPlaceholder = function() {
        this.dropPlaceholder.style[ transformProperty ] = 'translate(' +
            this.rect.x + 'px, ' + this.rect.y + 'px)';
    };

    proto.hideDropPlaceholder = function() {
        // only remove once, #333
        var parent = this.dropPlaceholder.parentNode;
        if ( parent ) {
            parent.removeChild( this.dropPlaceholder );
        }
    };

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

    return Item;

}));

/*!
 * Packery v2.1.2
 * Gapless, draggable grid layouts
 *
 * Licensed GPLv3 for open source use
 * or Packery Commercial License for commercial use
 *
 * http://packery.metafizzy.co
 * Copyright 2013-2018 Metafizzy
 */

( function( window, factory ) {
    // universal module definition
    /* jshint strict: false */ /* globals define, module, require */
    if ( typeof define == 'function' && define.amd ) {
        // AMD
        define( [
                'get-size/get-size',
                'outlayer/outlayer',
                'packery/js/rect',
                'packery/js/packer',
                'packery/js/item'
            ],
            factory );
    } else if ( typeof module == 'object' && module.exports ) {
        // CommonJS
        module.exports = factory(
            require('get-size'),
            require('outlayer'),
            require('./rect'),
            require('./packer'),
            require('./item')
        );
    } else {
        // browser global
        window.Packery = factory(
            window.getSize,
            window.Outlayer,
            window.Packery.Rect,
            window.Packery.Packer,
            window.Packery.Item
        );
    }

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

// ----- Rect ----- //

// allow for pixel rounding errors IE8-IE11 & Firefox; #227
    Rect.prototype.canFit = function( rect ) {
        return this.width >= rect.width - 1 && this.height >= rect.height - 1;
    };

// -------------------------- Packery -------------------------- //

// create an Outlayer layout class
    var Packery = Outlayer.create('packery');
    Packery.Item = Item;

    var proto = Packery.prototype;

    proto._create = function() {
        // call super
        Outlayer.prototype._create.call( this );

        // initial properties
        this.packer = new Packer();
        // packer for drop targets
        this.shiftPacker = new Packer();
        this.isEnabled = true;

        this.dragItemCount = 0;

        // create drag handlers
        var _this = this;
        this.handleDraggabilly = {
            dragStart: function() {
                _this.itemDragStart( this.element );
            },
            dragMove: function() {
                _this.itemDragMove( this.element, this.position.x, this.position.y );
            },
            dragEnd: function() {
                _this.itemDragEnd( this.element );
            }
        };

        this.handleUIDraggable = {
            start: function handleUIDraggableStart( event, ui ) {
                // HTML5 may trigger dragstart, dismiss HTML5 dragging
                if ( !ui ) {
                    return;
                }
                _this.itemDragStart( event.currentTarget );
            },
            drag: function handleUIDraggableDrag( event, ui ) {
                if ( !ui ) {
                    return;
                }
                _this.itemDragMove( event.currentTarget, ui.position.left, ui.position.top );
            },
            stop: function handleUIDraggableStop( event, ui ) {
                if ( !ui ) {
                    return;
                }
                _this.itemDragEnd( event.currentTarget );
            }
        };

    };


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

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

        this._getMeasurements();

        // reset packer
        var width, height, sortDirection;
        // packer settings, if horizontal or vertical
        if ( this._getOption('horizontal') ) {
            width = Infinity;
            height = this.size.innerHeight + this.gutter;
            sortDirection = 'rightwardTopToBottom';
        } else {
            width = this.size.innerWidth + this.gutter;
            height = Infinity;
            sortDirection = 'downwardLeftToRight';
        }

        this.packer.width = this.shiftPacker.width = width;
        this.packer.height = this.shiftPacker.height = height;
        this.packer.sortDirection = this.shiftPacker.sortDirection = sortDirection;

        this.packer.reset();

        // layout
        this.maxY = 0;
        this.maxX = 0;
    };

    /**
     * update columnWidth, rowHeight, & gutter
     * @private
     */
    proto._getMeasurements = function() {
        this._getMeasurement( 'columnWidth', 'width' );
        this._getMeasurement( 'rowHeight', 'height' );
        this._getMeasurement( 'gutter', 'width' );
    };

    proto._getItemLayoutPosition = function( item ) {
        this._setRectSize( item.element, item.rect );
        if ( this.isShifting || this.dragItemCount > 0 ) {
            var packMethod = this._getPackMethod();
            this.packer[ packMethod ]( item.rect );
        } else {
            this.packer.pack( item.rect );
        }

        this._setMaxXY( item.rect );
        return item.rect;
    };

    proto.shiftLayout = function() {
        this.isShifting = true;
        this.layout();
        delete this.isShifting;
    };

    proto._getPackMethod = function() {
        return this._getOption('horizontal') ? 'rowPack' : 'columnPack';
    };


    /**
     * set max X and Y value, for size of container
     * @param {Packery.Rect} rect
     * @private
     */
    proto._setMaxXY = function( rect ) {
        this.maxX = Math.max( rect.x + rect.width, this.maxX );
        this.maxY = Math.max( rect.y + rect.height, this.maxY );
    };

    /**
     * set the width and height of a rect, applying columnWidth and rowHeight
     * @param {Element} elem
     * @param {Packery.Rect} rect
     */
    proto._setRectSize = function( elem, rect ) {
        var size = getSize( elem );
        var w = size.outerWidth;
        var h = size.outerHeight;
        // size for columnWidth and rowHeight, if available
        // only check if size is non-zero, #177
        if ( w || h ) {
            w = this._applyGridGutter( w, this.columnWidth );
            h = this._applyGridGutter( h, this.rowHeight );
        }
        // rect must fit in packer
        rect.width = Math.min( w, this.packer.width );
        rect.height = Math.min( h, this.packer.height );
    };

    /**
     * fits item to columnWidth/rowHeight and adds gutter
     * @param {Number} measurement - item width or height
     * @param {Number} gridSize - columnWidth or rowHeight
     * @returns measurement
     */
    proto._applyGridGutter = function( measurement, gridSize ) {
        // just add gutter if no gridSize
        if ( !gridSize ) {
            return measurement + this.gutter;
        }
        gridSize += this.gutter;
        // fit item to columnWidth/rowHeight
        var remainder = measurement % gridSize;
        var mathMethod = remainder && remainder < 1 ? 'round' : 'ceil';
        measurement = Math[ mathMethod ]( measurement / gridSize ) * gridSize;
        return measurement;
    };

    proto._getContainerSize = function() {
        if ( this._getOption('horizontal') ) {
            return {
                width: this.maxX - this.gutter
            };
        } else {
            return {
                height: this.maxY - this.gutter
            };
        }
    };


// -------------------------- stamp -------------------------- //

    /**
     * makes space for element
     * @param {Element} elem
     */
    proto._manageStamp = function( elem ) {

        var item = this.getItem( elem );
        var rect;
        if ( item && item.isPlacing ) {
            rect = item.rect;
        } else {
            var offset = this._getElementOffset( elem );
            rect = new Rect({
                x: this._getOption('originLeft') ? offset.left : offset.right,
                y: this._getOption('originTop') ? offset.top : offset.bottom
            });
        }

        this._setRectSize( elem, rect );
        // save its space in the packer
        this.packer.placed( rect );
        this._setMaxXY( rect );
    };

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

    function verticalSorter( a, b ) {
        return a.position.y - b.position.y || a.position.x - b.position.x;
    }

    function horizontalSorter( a, b ) {
        return a.position.x - b.position.x || a.position.y - b.position.y;
    }

    proto.sortItemsByPosition = function() {
        var sorter = this._getOption('horizontal') ? horizontalSorter : verticalSorter;
        this.items.sort( sorter );
    };

    /**
     * Fit item element in its current position
     * Packery will position elements around it
     * useful for expanding elements
     *
     * @param {Element} elem
     * @param {Number} x - horizontal destination position, optional
     * @param {Number} y - vertical destination position, optional
     */
    proto.fit = function( elem, x, y ) {
        var item = this.getItem( elem );
        if ( !item ) {
            return;
        }

        // stamp item to get it out of layout
        this.stamp( item.element );
        // set placing flag
        item.enablePlacing();
        this.updateShiftTargets( item );
        // fall back to current position for fitting
        x = x === undefined ? item.rect.x: x;
        y = y === undefined ? item.rect.y: y;
        // position it best at its destination
        this.shift( item, x, y );
        this._bindFitEvents( item );
        item.moveTo( item.rect.x, item.rect.y );
        // layout everything else
        this.shiftLayout();
        // return back to regularly scheduled programming
        this.unstamp( item.element );
        this.sortItemsByPosition();
        item.disablePlacing();
    };

    /**
     * emit event when item is fit and other items are laid out
     * @param {Packery.Item} item
     * @private
     */
    proto._bindFitEvents = function( item ) {
        var _this = this;
        var ticks = 0;
        function onLayout() {
            ticks++;
            if ( ticks != 2 ) {
                return;
            }
            _this.dispatchEvent( 'fitComplete', null, [ item ] );
        }
        // when item is laid out
        item.once( 'layout', onLayout );
        // when all items are laid out
        this.once( 'layoutComplete', onLayout );
    };

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

// debounced, layout on resize
    proto.resize = function() {
        // don't trigger if size did not change
        // or if resize was unbound. See #285, outlayer#9
        if ( !this.isResizeBound || !this.needsResizeLayout() ) {
            return;
        }

        if ( this.options.shiftPercentResize ) {
            this.resizeShiftPercentLayout();
        } else {
            this.layout();
        }
    };

    /**
     * check if layout is needed post layout
     * @returns Boolean
     */
    proto.needsResizeLayout = function() {
        var size = getSize( this.element );
        var innerSize = this._getOption('horizontal') ? 'innerHeight' : 'innerWidth';
        return size[ innerSize ] != this.size[ innerSize ];
    };

    proto.resizeShiftPercentLayout = function() {
        var items = this._getItemsForLayout( this.items );

        var isHorizontal = this._getOption('horizontal');
        var coord = isHorizontal ? 'y' : 'x';
        var measure = isHorizontal ? 'height' : 'width';
        var segmentName = isHorizontal ? 'rowHeight' : 'columnWidth';
        var innerSize = isHorizontal ? 'innerHeight' : 'innerWidth';

        // proportional re-align items
        var previousSegment = this[ segmentName ];
        previousSegment = previousSegment && previousSegment + this.gutter;

        if ( previousSegment ) {
            this._getMeasurements();
            var currentSegment = this[ segmentName ] + this.gutter;
            items.forEach( function( item ) {
                var seg = Math.round( item.rect[ coord ] / previousSegment );
                item.rect[ coord ] = seg * currentSegment;
            });
        } else {
            var currentSize = getSize( this.element )[ innerSize ] + this.gutter;
            var previousSize = this.packer[ measure ];
            items.forEach( function( item ) {
                item.rect[ coord ] = ( item.rect[ coord ] / previousSize ) * currentSize;
            });
        }

        this.shiftLayout();
    };

// -------------------------- drag -------------------------- //

    /**
     * handle an item drag start event
     * @param {Element} elem
     */
    proto.itemDragStart = function( elem ) {
        if ( !this.isEnabled ) {
            return;
        }
        this.stamp( elem );
        // this.ignore( elem );
        var item = this.getItem( elem );
        if ( !item ) {
            return;
        }

        item.enablePlacing();
        item.showDropPlaceholder();
        this.dragItemCount++;
        this.updateShiftTargets( item );
    };

    proto.updateShiftTargets = function( dropItem ) {
        this.shiftPacker.reset();

        // pack stamps
        this._getBoundingRect();
        var isOriginLeft = this._getOption('originLeft');
        var isOriginTop = this._getOption('originTop');
        this.stamps.forEach( function( stamp ) {
            // ignore dragged item
            var item = this.getItem( stamp );
            if ( item && item.isPlacing ) {
                return;
            }
            var offset = this._getElementOffset( stamp );
            var rect = new Rect({
                x: isOriginLeft ? offset.left : offset.right,
                y: isOriginTop ? offset.top : offset.bottom
            });
            this._setRectSize( stamp, rect );
            // save its space in the packer
            this.shiftPacker.placed( rect );
        }, this );

        // reset shiftTargets
        var isHorizontal = this._getOption('horizontal');
        var segmentName = isHorizontal ? 'rowHeight' : 'columnWidth';
        var measure = isHorizontal ? 'height' : 'width';

        this.shiftTargetKeys = [];
        this.shiftTargets = [];
        var boundsSize;
        var segment = this[ segmentName ];
        segment = segment && segment + this.gutter;

        if ( segment ) {
            var segmentSpan = Math.ceil( dropItem.rect[ measure ] / segment );
            var segs = Math.floor( ( this.shiftPacker[ measure ] + this.gutter ) / segment );
            boundsSize = ( segs - segmentSpan ) * segment;
            // add targets on top
            for ( var i=0; i < segs; i++ ) {
                var initialX = isHorizontal ? 0 : i * segment;
                var initialY = isHorizontal ? i * segment : 0;
                this._addShiftTarget( initialX, initialY, boundsSize );
            }
        } else {
            boundsSize = ( this.shiftPacker[ measure ] + this.gutter ) - dropItem.rect[ measure ];
            this._addShiftTarget( 0, 0, boundsSize );
        }

        // pack each item to measure where shiftTargets are
        var items = this._getItemsForLayout( this.items );
        var packMethod = this._getPackMethod();
        items.forEach( function( item ) {
            var rect = item.rect;
            this._setRectSize( item.element, rect );
            this.shiftPacker[ packMethod ]( rect );

            // add top left corner
            this._addShiftTarget( rect.x, rect.y, boundsSize );
            // add bottom left / top right corner
            var cornerX = isHorizontal ? rect.x + rect.width : rect.x;
            var cornerY = isHorizontal ? rect.y : rect.y + rect.height;
            this._addShiftTarget( cornerX, cornerY, boundsSize );

            if ( segment ) {
                // add targets for each column on bottom / row on right
                var segSpan = Math.round( rect[ measure ] / segment );
                for ( var i=1; i < segSpan; i++ ) {
                    var segX = isHorizontal ? cornerX : rect.x + segment * i;
                    var segY = isHorizontal ? rect.y + segment * i : cornerY;
                    this._addShiftTarget( segX, segY, boundsSize );
                }
            }
        }, this );

    };

    proto._addShiftTarget = function( x, y, boundsSize ) {
        var checkCoord = this._getOption('horizontal') ? y : x;
        if ( checkCoord !== 0 && checkCoord > boundsSize ) {
            return;
        }
        // create string for a key, easier to keep track of what targets
        var key = x + ',' + y;
        var hasKey = this.shiftTargetKeys.indexOf( key ) != -1;
        if ( hasKey ) {
            return;
        }
        this.shiftTargetKeys.push( key );
        this.shiftTargets.push({ x: x, y: y });
    };

// -------------------------- drop -------------------------- //

    proto.shift = function( item, x, y ) {
        var shiftPosition;
        var minDistance = Infinity;
        var position = { x: x, y: y };
        this.shiftTargets.forEach( function( target ) {
            var distance = getDistance( target, position );
            if ( distance < minDistance ) {
                shiftPosition = target;
                minDistance = distance;
            }
        });
        item.rect.x = shiftPosition.x;
        item.rect.y = shiftPosition.y;
    };

    function getDistance( a, b ) {
        var dx = b.x - a.x;
        var dy = b.y - a.y;
        return Math.sqrt( dx * dx + dy * dy );
    }

// -------------------------- drag move -------------------------- //

    var DRAG_THROTTLE_TIME = 120;

    /**
     * handle an item drag move event
     * @param {Element} elem
     * @param {Number} x - horizontal change in position
     * @param {Number} y - vertical change in position
     */
    proto.itemDragMove = function( elem, x, y ) {
        var item = this.isEnabled && this.getItem( elem );
        if ( !item ) {
            return;
        }

        x -= this.size.paddingLeft;
        y -= this.size.paddingTop;

        var _this = this;
        function onDrag() {
            _this.shift( item, x, y );
            item.positionDropPlaceholder();
            _this.layout();
        }

        // throttle
        var now = new Date();
        var isThrottled = this._itemDragTime && now - this._itemDragTime < DRAG_THROTTLE_TIME;
        if ( isThrottled ) {
            clearTimeout( this.dragTimeout );
            this.dragTimeout = setTimeout( onDrag, DRAG_THROTTLE_TIME );
        } else {
            onDrag();
            this._itemDragTime = now;
        }
    };

// -------------------------- drag end -------------------------- //

    /**
     * handle an item drag end event
     * @param {Element} elem
     */
    proto.itemDragEnd = function( elem ) {
        var item = this.isEnabled && this.getItem( elem );
        if ( !item ) {
            return;
        }

        clearTimeout( this.dragTimeout );
        item.element.classList.add('is-positioning-post-drag');

        var completeCount = 0;
        var _this = this;
        function onDragEndLayoutComplete() {
            completeCount++;
            if ( completeCount != 2 ) {
                return;
            }
            // reset drag item
            item.element.classList.remove('is-positioning-post-drag');
            item.hideDropPlaceholder();
            _this.dispatchEvent( 'dragItemPositioned', null, [ item ] );
        }

        item.once( 'layout', onDragEndLayoutComplete );
        this.once( 'layoutComplete', onDragEndLayoutComplete );
        item.moveTo( item.rect.x, item.rect.y );
        this.layout();
        this.dragItemCount = Math.max( 0, this.dragItemCount - 1 );
        this.sortItemsByPosition();
        item.disablePlacing();
        this.unstamp( item.element );
    };

    /**
     * binds Draggabilly events
     * @param {Draggabilly} draggie
     */
    proto.bindDraggabillyEvents = function( draggie ) {
        this._bindDraggabillyEvents( draggie, 'on' );
    };

    proto.unbindDraggabillyEvents = function( draggie ) {
        this._bindDraggabillyEvents( draggie, 'off' );
    };

    proto._bindDraggabillyEvents = function( draggie, method ) {
        var handlers = this.handleDraggabilly;
        draggie[ method ]( 'dragStart', handlers.dragStart );
        draggie[ method ]( 'dragMove', handlers.dragMove );
        draggie[ method ]( 'dragEnd', handlers.dragEnd );
    };

    /**
     * binds jQuery UI Draggable events
     * @param {jQuery} $elems
     */
    proto.bindUIDraggableEvents = function( $elems ) {
        this._bindUIDraggableEvents( $elems, 'on' );
    };

    proto.unbindUIDraggableEvents = function( $elems ) {
        this._bindUIDraggableEvents( $elems, 'off' );
    };

    proto._bindUIDraggableEvents = function( $elems, method ) {
        var handlers = this.handleUIDraggable;
        $elems
            [ method ]( 'dragstart', handlers.start )
            [ method ]( 'drag', handlers.drag )
            [ method ]( 'dragstop', handlers.stop );
    };

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

    var _destroy = proto.destroy;
    proto.destroy = function() {
        _destroy.apply( this, arguments );
        // disable flag; prevent drag events from triggering. #72
        this.isEnabled = false;
    };

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

    Packery.Rect = Rect;
    Packery.Packer = Packer;

    return Packery;

}));
