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From ey...@apache.org
Subject [5/8] chukwa git commit: CHUKWA-806. Replace gridster with gridstack. (Eric Yang)
Date Sun, 01 May 2016 04:00:51 GMT
http://git-wip-us.apache.org/repos/asf/chukwa/blob/6f6e4399/src/main/web/hicc/home/js/jquery.gridster.js
----------------------------------------------------------------------
diff --git a/src/main/web/hicc/home/js/jquery.gridster.js b/src/main/web/hicc/home/js/jquery.gridster.js
deleted file mode 100755
index 0f61c44..0000000
--- a/src/main/web/hicc/home/js/jquery.gridster.js
+++ /dev/null
@@ -1,4051 +0,0 @@
-/*! gridster.js - v0.5.6 - 2014-09-25
-* http://gridster.net/
-* Copyright (c) 2014 ducksboard; Licensed MIT */
-
-;(function(root, factory) {
-
-    if (typeof define === 'function' && define.amd) {
-        define('gridster-coords', ['jquery'], factory);
-    } else {
-       root.GridsterCoords = factory(root.$ || root.jQuery);
-    }
-
-}(this, function($) {
-    /**
-    * Creates objects with coordinates (x1, y1, x2, y2, cx, cy, width, height)
-    * to simulate DOM elements on the screen.
-    * Coords is used by Gridster to create a faux grid with any DOM element can
-    * collide.
-    *
-    * @class Coords
-    * @param {HTMLElement|Object} obj The jQuery HTMLElement or a object with: left,
-    * top, width and height properties.
-    * @return {Object} Coords instance.
-    * @constructor
-    */
-    function Coords(obj) {
-        if (obj[0] && $.isPlainObject(obj[0])) {
-            this.data = obj[0];
-        }else {
-            this.el = obj;
-        }
-
-        this.isCoords = true;
-        this.coords = {};
-        this.init();
-        return this;
-    }
-
-
-    var fn = Coords.prototype;
-
-
-    fn.init = function(){
-        this.set();
-        this.original_coords = this.get();
-    };
-
-
-    fn.set = function(update, not_update_offsets) {
-        var el = this.el;
-
-        if (el && !update) {
-            this.data = el.offset();
-            this.data.width = el.width();
-            this.data.height = el.height();
-        }
-
-        if (el && update && !not_update_offsets) {
-            var offset = el.offset();
-            this.data.top = offset.top;
-            this.data.left = offset.left;
-        }
-
-        var d = this.data;
-
-        typeof d.left === 'undefined' && (d.left = d.x1);
-        typeof d.top === 'undefined' && (d.top = d.y1);
-
-        this.coords.x1 = d.left;
-        this.coords.y1 = d.top;
-        this.coords.x2 = d.left + d.width;
-        this.coords.y2 = d.top + d.height;
-        this.coords.cx = d.left + (d.width / 2);
-        this.coords.cy = d.top + (d.height / 2);
-        this.coords.width  = d.width;
-        this.coords.height = d.height;
-        this.coords.el  = el || false ;
-
-        return this;
-    };
-
-
-    fn.update = function(data){
-        if (!data && !this.el) {
-            return this;
-        }
-
-        if (data) {
-            var new_data = $.extend({}, this.data, data);
-            this.data = new_data;
-            return this.set(true, true);
-        }
-
-        this.set(true);
-        return this;
-    };
-
-
-    fn.get = function(){
-        return this.coords;
-    };
-
-    fn.destroy = function() {
-        this.el.removeData('coords');
-        delete this.el;
-    };
-
-    //jQuery adapter
-    $.fn.coords = function() {
-        if (this.data('coords') ) {
-            return this.data('coords');
-        }
-
-        var ins = new Coords(this, arguments[0]);
-        this.data('coords', ins);
-        return ins;
-    };
-
-    return Coords;
-
-}));
-
-;(function(root, factory) {
-
-    if (typeof define === 'function' && define.amd) {
-        define('gridster-collision', ['jquery', 'gridster-coords'], factory);
-    } else {
-        root.GridsterCollision = factory(root.$ || root.jQuery,
-            root.GridsterCoords);
-    }
-
-}(this, function($, Coords) {
-
-    var defaults = {
-        colliders_context: document.body,
-        overlapping_region: 'C'
-        // ,on_overlap: function(collider_data){},
-        // on_overlap_start : function(collider_data){},
-        // on_overlap_stop : function(collider_data){}
-    };
-
-
-    /**
-    * Detects collisions between a DOM element against other DOM elements or
-    * Coords objects.
-    *
-    * @class Collision
-    * @uses Coords
-    * @param {HTMLElement} el The jQuery wrapped HTMLElement.
-    * @param {HTMLElement|Array} colliders Can be a jQuery collection
-    *  of HTMLElements or an Array of Coords instances.
-    * @param {Object} [options] An Object with all options you want to
-    *        overwrite:
-    *   @param {String} [options.overlapping_region] Determines when collision
-    *    is valid, depending on the overlapped area. Values can be: 'N', 'S',
-    *    'W', 'E', 'C' or 'all'. Default is 'C'.
-    *   @param {Function} [options.on_overlap_start] Executes a function the first
-    *    time each `collider ` is overlapped.
-    *   @param {Function} [options.on_overlap_stop] Executes a function when a
-    *    `collider` is no longer collided.
-    *   @param {Function} [options.on_overlap] Executes a function when the
-    * mouse is moved during the collision.
-    * @return {Object} Collision instance.
-    * @constructor
-    */
-    function Collision(el, colliders, options) {
-        this.options = $.extend(defaults, options);
-        this.$element = el;
-        this.last_colliders = [];
-        this.last_colliders_coords = [];
-        this.set_colliders(colliders);
-
-        this.init();
-    }
-
-    Collision.defaults = defaults;
-
-    var fn = Collision.prototype;
-
-
-    fn.init = function() {
-        this.find_collisions();
-    };
-
-
-    fn.overlaps = function(a, b) {
-        var x = false;
-        var y = false;
-
-        if ((b.x1 >= a.x1 && b.x1 <= a.x2) ||
-            (b.x2 >= a.x1 && b.x2 <= a.x2) ||
-            (a.x1 >= b.x1 && a.x2 <= b.x2)
-        ) { x = true; }
-
-        if ((b.y1 >= a.y1 && b.y1 <= a.y2) ||
-            (b.y2 >= a.y1 && b.y2 <= a.y2) ||
-            (a.y1 >= b.y1 && a.y2 <= b.y2)
-        ) { y = true; }
-
-        return (x && y);
-    };
-
-
-    fn.detect_overlapping_region = function(a, b){
-        var regionX = '';
-        var regionY = '';
-
-        if (a.y1 > b.cy && a.y1 < b.y2) { regionX = 'N'; }
-        if (a.y2 > b.y1 && a.y2 < b.cy) { regionX = 'S'; }
-        if (a.x1 > b.cx && a.x1 < b.x2) { regionY = 'W'; }
-        if (a.x2 > b.x1 && a.x2 < b.cx) { regionY = 'E'; }
-
-        return (regionX + regionY) || 'C';
-    };
-
-
-    fn.calculate_overlapped_area_coords = function(a, b){
-        var x1 = Math.max(a.x1, b.x1);
-        var y1 = Math.max(a.y1, b.y1);
-        var x2 = Math.min(a.x2, b.x2);
-        var y2 = Math.min(a.y2, b.y2);
-
-        return $({
-            left: x1,
-            top: y1,
-             width : (x2 - x1),
-            height: (y2 - y1)
-          }).coords().get();
-    };
-
-
-    fn.calculate_overlapped_area = function(coords){
-        return (coords.width * coords.height);
-    };
-
-
-    fn.manage_colliders_start_stop = function(new_colliders_coords, start_callback, stop_callback){
-        var last = this.last_colliders_coords;
-
-        for (var i = 0, il = last.length; i < il; i++) {
-            if ($.inArray(last[i], new_colliders_coords) === -1) {
-                start_callback.call(this, last[i]);
-            }
-        }
-
-        for (var j = 0, jl = new_colliders_coords.length; j < jl; j++) {
-            if ($.inArray(new_colliders_coords[j], last) === -1) {
-                stop_callback.call(this, new_colliders_coords[j]);
-            }
-
-        }
-    };
-
-
-    fn.find_collisions = function(player_data_coords){
-        var self = this;
-        var overlapping_region = this.options.overlapping_region;
-        var colliders_coords = [];
-        var colliders_data = [];
-        var $colliders = (this.colliders || this.$colliders);
-        var count = $colliders.length;
-        var player_coords = self.$element.coords()
-                             .update(player_data_coords || false).get();
-
-        while(count--){
-          var $collider = self.$colliders ?
-                           $($colliders[count]) : $colliders[count];
-          var $collider_coords_ins = ($collider.isCoords) ?
-                  $collider : $collider.coords();
-          var collider_coords = $collider_coords_ins.get();
-          var overlaps = self.overlaps(player_coords, collider_coords);
-
-          if (!overlaps) {
-            continue;
-          }
-
-          var region = self.detect_overlapping_region(
-              player_coords, collider_coords);
-
-            //todo: make this an option
-            if (region === overlapping_region || overlapping_region === 'all') {
-
-                var area_coords = self.calculate_overlapped_area_coords(
-                    player_coords, collider_coords);
-                var area = self.calculate_overlapped_area(area_coords);
-                var collider_data = {
-                    area: area,
-                    area_coords : area_coords,
-                    region: region,
-                    coords: collider_coords,
-                    player_coords: player_coords,
-                    el: $collider
-                };
-
-                if (self.options.on_overlap) {
-                    self.options.on_overlap.call(this, collider_data);
-                }
-                colliders_coords.push($collider_coords_ins);
-                colliders_data.push(collider_data);
-            }
-        }
-
-        if (self.options.on_overlap_stop || self.options.on_overlap_start) {
-            this.manage_colliders_start_stop(colliders_coords,
-                self.options.on_overlap_start, self.options.on_overlap_stop);
-        }
-
-        this.last_colliders_coords = colliders_coords;
-
-        return colliders_data;
-    };
-
-
-    fn.get_closest_colliders = function(player_data_coords){
-        var colliders = this.find_collisions(player_data_coords);
-
-        colliders.sort(function(a, b) {
-            /* if colliders are being overlapped by the "C" (center) region,
-             * we have to set a lower index in the array to which they are placed
-             * above in the grid. */
-            if (a.region === 'C' && b.region === 'C') {
-                if (a.coords.y1 < b.coords.y1 || a.coords.x1 < b.coords.x1) {
-                    return - 1;
-                }else{
-                    return 1;
-                }
-            }
-
-            if (a.area < b.area) {
-                return 1;
-            }
-
-            return 1;
-        });
-        return colliders;
-    };
-
-
-    fn.set_colliders = function(colliders) {
-        if (typeof colliders === 'string' || colliders instanceof $) {
-            this.$colliders = $(colliders,
-                 this.options.colliders_context).not(this.$element);
-        }else{
-            this.colliders = $(colliders);
-        }
-    };
-
-
-    //jQuery adapter
-    $.fn.collision = function(collider, options) {
-          return new Collision( this, collider, options );
-    };
-
-    return Collision;
-
-}));
-
-;(function(window, undefined) {
-
-    /* Delay, debounce and throttle functions taken from underscore.js
-     *
-     * Copyright (c) 2009-2013 Jeremy Ashkenas, DocumentCloud and
-     * Investigative Reporters & Editors
-     *
-     * Permission is hereby granted, free of charge, to any person
-     * obtaining a copy of this software and associated documentation
-     * files (the "Software"), to deal in the Software without
-     * restriction, including without limitation the rights to use,
-     * copy, modify, merge, publish, distribute, sublicense, and/or sell
-     * copies of the Software, and to permit persons to whom the
-     * Software is furnished to do so, subject to the following
-     * conditions:
-     *
-     * The above copyright notice and this permission notice shall be
-     * included in all copies or substantial portions of the Software.
-     *
-     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-     * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
-     * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-     * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
-     * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
-     * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-     * OTHER DEALINGS IN THE SOFTWARE.
-     */
-
-    window.delay = function(func, wait) {
-        var args = Array.prototype.slice.call(arguments, 2);
-        return setTimeout(function(){ return func.apply(null, args); }, wait);
-    };
-
-    window.debounce = function(func, wait, immediate) {
-        var timeout;
-        return function() {
-          var context = this, args = arguments;
-          var later = function() {
-            timeout = null;
-            if (!immediate) func.apply(context, args);
-          };
-          if (immediate && !timeout) func.apply(context, args);
-          clearTimeout(timeout);
-          timeout = setTimeout(later, wait);
-        };
-    };
-
-    window.throttle = function(func, wait) {
-        var context, args, timeout, throttling, more, result;
-        var whenDone = debounce(
-            function(){ more = throttling = false; }, wait);
-        return function() {
-          context = this; args = arguments;
-          var later = function() {
-            timeout = null;
-            if (more) func.apply(context, args);
-            whenDone();
-          };
-          if (!timeout) timeout = setTimeout(later, wait);
-          if (throttling) {
-            more = true;
-          } else {
-            result = func.apply(context, args);
-          }
-          whenDone();
-          throttling = true;
-          return result;
-        };
-    };
-
-})(window);
-
-;(function(root, factory) {
-
-    if (typeof define === 'function' && define.amd) {
-        define('gridster-draggable', ['jquery'], factory);
-    } else {
-        root.GridsterDraggable = factory(root.$ || root.jQuery);
-    }
-
-}(this, function($) {
-
-    var defaults = {
-        items: 'li',
-        distance: 1,
-        limit: true,
-        offset_left: 0,
-        autoscroll: true,
-        ignore_dragging: ['INPUT', 'TEXTAREA', 'SELECT', 'BUTTON'], // or function
-        handle: null,
-        container_width: 0,  // 0 == auto
-        move_element: true,
-        helper: false,  // or 'clone'
-        remove_helper: true
-        // drag: function(e) {},
-        // start : function(e, ui) {},
-        // stop : function(e) {}
-    };
-
-    var $window = $(window);
-    var dir_map = { x : 'left', y : 'top' };
-    var isTouch = !!('ontouchstart' in window);
-
-    var capitalize = function(str) {
-        return str.charAt(0).toUpperCase() + str.slice(1);
-    };
-
-    var idCounter = 0;
-    var uniqId = function() {
-        return ++idCounter + '';
-    }
-
-    /**
-    * Basic drag implementation for DOM elements inside a container.
-    * Provide start/stop/drag callbacks.
-    *
-    * @class Draggable
-    * @param {HTMLElement} el The HTMLelement that contains all the widgets
-    *  to be dragged.
-    * @param {Object} [options] An Object with all options you want to
-    *        overwrite:
-    *    @param {HTMLElement|String} [options.items] Define who will
-    *     be the draggable items. Can be a CSS Selector String or a
-    *     collection of HTMLElements.
-    *    @param {Number} [options.distance] Distance in pixels after mousedown
-    *     the mouse must move before dragging should start.
-    *    @param {Boolean} [options.limit] Constrains dragging to the width of
-    *     the container
-    *    @param {Object|Function} [options.ignore_dragging] Array of node names
-    *      that sould not trigger dragging, by default is `['INPUT', 'TEXTAREA',
-    *      'SELECT', 'BUTTON']`. If a function is used return true to ignore dragging.
-    *    @param {offset_left} [options.offset_left] Offset added to the item
-    *     that is being dragged.
-    *    @param {Number} [options.drag] Executes a callback when the mouse is
-    *     moved during the dragging.
-    *    @param {Number} [options.start] Executes a callback when the drag
-    *     starts.
-    *    @param {Number} [options.stop] Executes a callback when the drag stops.
-    * @return {Object} Returns `el`.
-    * @constructor
-    */
-    function Draggable(el, options) {
-      this.options = $.extend({}, defaults, options);
-      this.$document = $(document);
-      this.$container = $(el);
-      this.$dragitems = $(this.options.items, this.$container);
-      this.is_dragging = false;
-      this.player_min_left = 0 + this.options.offset_left;
-      this.id = uniqId();
-      this.ns = '.gridster-draggable-' + this.id;
-      this.init();
-    }
-
-    Draggable.defaults = defaults;
-
-    var fn = Draggable.prototype;
-
-    fn.init = function() {
-        var pos = this.$container.css('position');
-        this.calculate_dimensions();
-        this.$container.css('position', pos === 'static' ? 'relative' : pos);
-        this.disabled = false;
-        this.events();
-
-        $(window).bind(this.nsEvent('resize'),
-            throttle($.proxy(this.calculate_dimensions, this), 200));
-    };
-
-    fn.nsEvent = function(ev) {
-        return (ev || '') + this.ns;
-    };
-
-    fn.events = function() {
-        this.pointer_events = {
-            start: this.nsEvent('touchstart') + ' ' + this.nsEvent('mousedown'),
-            move: this.nsEvent('touchmove') + ' ' + this.nsEvent('mousemove'),
-            end: this.nsEvent('touchend') + ' ' + this.nsEvent('mouseup'),
-        };
-
-        this.$container.on(this.nsEvent('selectstart'),
-            $.proxy(this.on_select_start, this));
-
-        this.$container.on(this.pointer_events.start, this.options.items,
-            $.proxy(this.drag_handler, this));
-
-        this.$document.on(this.pointer_events.end, $.proxy(function(e) {
-            this.is_dragging = false;
-            if (this.disabled) { return; }
-            this.$document.off(this.pointer_events.move);
-            if (this.drag_start) {
-                this.on_dragstop(e);
-            }
-        }, this));
-    };
-
-    fn.get_actual_pos = function($el) {
-        var pos = $el.position();
-        return pos;
-    };
-
-
-    fn.get_mouse_pos = function(e) {
-        if (e.originalEvent && e.originalEvent.touches) {
-            var oe = e.originalEvent;
-            e = oe.touches.length ? oe.touches[0] : oe.changedTouches[0];
-        }
-
-        return {
-            left: e.clientX,
-            top: e.clientY
-        };
-    };
-
-
-    fn.get_offset = function(e) {
-        e.preventDefault();
-        var mouse_actual_pos = this.get_mouse_pos(e);
-        var diff_x = Math.round(
-            mouse_actual_pos.left - this.mouse_init_pos.left);
-        var diff_y = Math.round(mouse_actual_pos.top - this.mouse_init_pos.top);
-
-        var left = Math.round(this.el_init_offset.left +
-            diff_x - this.baseX + $(window).scrollLeft() - this.win_offset_x);
-        var top = Math.round(this.el_init_offset.top +
-            diff_y - this.baseY + $(window).scrollTop() - this.win_offset_y);
-
-        if (this.options.limit) {
-            if (left > this.player_max_left) {
-                left = this.player_max_left;
-            } else if(left < this.player_min_left) {
-                left = this.player_min_left;
-            }
-        }
-
-        return {
-            position: {
-                left: left,
-                top: top
-            },
-            pointer: {
-                left: mouse_actual_pos.left,
-                top: mouse_actual_pos.top,
-                diff_left: diff_x + ($(window).scrollLeft() - this.win_offset_x),
-                diff_top: diff_y + ($(window).scrollTop() - this.win_offset_y)
-            }
-        };
-    };
-
-
-    fn.get_drag_data = function(e) {
-        var offset = this.get_offset(e);
-        offset.$player = this.$player;
-        offset.$helper = this.helper ? this.$helper : this.$player;
-
-        return offset;
-    };
-
-
-    fn.set_limits = function(container_width) {
-        container_width || (container_width = this.$container.width());
-        this.player_max_left = (container_width - this.player_width +
-            - this.options.offset_left);
-
-        this.options.container_width = container_width;
-
-        return this;
-    };
-
-
-    fn.scroll_in = function(axis, data) {
-        var dir_prop = dir_map[axis];
-
-        var area_size = 50;
-        var scroll_inc = 30;
-
-        var is_x = axis === 'x';
-        var window_size = is_x ? this.window_width : this.window_height;
-        var doc_size = is_x ? $(document).width() : $(document).height();
-        var player_size = is_x ? this.$player.width() : this.$player.height();
-
-        var next_scroll;
-        var scroll_offset = $window['scroll' + capitalize(dir_prop)]();
-        var min_window_pos = scroll_offset;
-        var max_window_pos = min_window_pos + window_size;
-
-        var mouse_next_zone = max_window_pos - area_size;  // down/right
-        var mouse_prev_zone = min_window_pos + area_size;  // up/left
-
-        var abs_mouse_pos = min_window_pos + data.pointer[dir_prop];
-
-        var max_player_pos = (doc_size - window_size + player_size);
-
-        if (abs_mouse_pos >= mouse_next_zone) {
-            next_scroll = scroll_offset + scroll_inc;
-            if (next_scroll < max_player_pos) {
-                $window['scroll' + capitalize(dir_prop)](next_scroll);
-                this['scroll_offset_' + axis] += scroll_inc;
-            }
-        }
-
-        if (abs_mouse_pos <= mouse_prev_zone) {
-            next_scroll = scroll_offset - scroll_inc;
-            if (next_scroll > 0) {
-                $window['scroll' + capitalize(dir_prop)](next_scroll);
-                this['scroll_offset_' + axis] -= scroll_inc;
-            }
-        }
-
-        return this;
-    };
-
-
-    fn.manage_scroll = function(data) {
-        this.scroll_in('x', data);
-        this.scroll_in('y', data);
-    };
-
-
-    fn.calculate_dimensions = function(e) {
-        this.window_height = $window.height();
-        this.window_width = $window.width();
-    };
-
-
-    fn.drag_handler = function(e) {
-        var node = e.target.nodeName;
-        // skip if drag is disabled, or click was not done with the mouse primary button
-        if (this.disabled || e.which !== 1 && !isTouch) {
-            return;
-        }
-
-        if (this.ignore_drag(e)) {
-            return;
-        }
-
-        var self = this;
-        var first = true;
-        this.$player = $(e.currentTarget);
-
-        this.el_init_pos = this.get_actual_pos(this.$player);
-        this.mouse_init_pos = this.get_mouse_pos(e);
-        this.offsetY = this.mouse_init_pos.top - this.el_init_pos.top;
-
-        this.$document.on(this.pointer_events.move, function(mme) {
-            var mouse_actual_pos = self.get_mouse_pos(mme);
-            var diff_x = Math.abs(
-                mouse_actual_pos.left - self.mouse_init_pos.left);
-            var diff_y = Math.abs(
-                mouse_actual_pos.top - self.mouse_init_pos.top);
-            if (!(diff_x > self.options.distance ||
-                diff_y > self.options.distance)
-                ) {
-                return false;
-            }
-
-            if (first) {
-                first = false;
-                self.on_dragstart.call(self, mme);
-                return false;
-            }
-
-            if (self.is_dragging === true) {
-                self.on_dragmove.call(self, mme);
-            }
-
-            return false;
-        });
-
-        if (!isTouch) { return false; }
-    };
-
-
-    fn.on_dragstart = function(e) {
-        e.preventDefault();
-
-        if (this.is_dragging) { return this; }
-
-        this.drag_start = this.is_dragging = true;
-        var offset = this.$container.offset();
-        this.baseX = Math.round(offset.left);
-        this.baseY = Math.round(offset.top);
-        this.initial_container_width = this.options.container_width || this.$container.width();
-
-        if (this.options.helper === 'clone') {
-            this.$helper = this.$player.clone()
-                .appendTo(this.$container).addClass('helper');
-            this.helper = true;
-        } else {
-            this.helper = false;
-        }
-
-        this.win_offset_y = $(window).scrollTop();
-        this.win_offset_x = $(window).scrollLeft();
-        this.scroll_offset_y = 0;
-        this.scroll_offset_x = 0;
-        this.el_init_offset = this.$player.offset();
-        this.player_width = this.$player.width();
-        this.player_height = this.$player.height();
-
-        this.set_limits(this.options.container_width);
-
-        if (this.options.start) {
-            this.options.start.call(this.$player, e, this.get_drag_data(e));
-        }
-        return false;
-    };
-
-
-    fn.on_dragmove = function(e) {
-        var data = this.get_drag_data(e);
-
-        this.options.autoscroll && this.manage_scroll(data);
-
-        if (this.options.move_element) {
-            (this.helper ? this.$helper : this.$player).css({
-                'position': 'absolute',
-                'left' : data.position.left,
-                'top' : data.position.top
-            });
-        }
-
-        var last_position = this.last_position || data.position;
-        data.prev_position = last_position;
-
-        if (this.options.drag) {
-            this.options.drag.call(this.$player, e, data);
-        }
-
-        this.last_position = data.position;
-        return false;
-    };
-
-
-    fn.on_dragstop = function(e) {
-        var data = this.get_drag_data(e);
-        this.drag_start = false;
-
-        if (this.options.stop) {
-            this.options.stop.call(this.$player, e, data);
-        }
-
-        if (this.helper && this.options.remove_helper) {
-            this.$helper.remove();
-        }
-
-        return false;
-    };
-
-    fn.on_select_start = function(e) {
-        if (this.disabled) { return; }
-
-        if (this.ignore_drag(e)) {
-            return;
-        }
-
-        return false;
-    };
-
-    fn.enable = function() {
-        this.disabled = false;
-    };
-
-    fn.disable = function() {
-        this.disabled = true;
-    };
-
-    fn.destroy = function() {
-        this.disable();
-
-        this.$container.off(this.ns);
-        this.$document.off(this.ns);
-        $(window).off(this.ns);
-
-        $.removeData(this.$container, 'drag');
-    };
-
-    fn.ignore_drag = function(event) {
-        if (this.options.handle) {
-            return !$(event.target).is(this.options.handle);
-        }
-
-        if ($.isFunction(this.options.ignore_dragging)) {
-            return this.options.ignore_dragging(event);
-        }
-
-        return $(event.target).is(this.options.ignore_dragging.join(', '));
-    };
-
-    //jQuery adapter
-    $.fn.drag = function ( options ) {
-        return new Draggable(this, options);
-    };
-
-    return Draggable;
-
-}));
-
-;(function(root, factory) {
-
-    if (typeof define === 'function' && define.amd) {
-        define(['jquery', 'gridster-draggable', 'gridster-collision'], factory);
-    } else {
-        root.Gridster = factory(root.$ || root.jQuery, root.GridsterDraggable,
-            root.GridsterCollision);
-    }
-
- }(this, function($, Draggable, Collision) {
-
-    var defaults = {
-        namespace: '',
-        widget_selector: 'li',
-        widget_margins: [10, 10],
-        widget_base_dimensions: [400, 225],
-        extra_rows: 0,
-        extra_cols: 0,
-        min_cols: 1,
-        max_cols: Infinity,
-        min_rows: 15,
-        max_size_x: false,
-        autogrow_cols: false,
-        autogenerate_stylesheet: true,
-        avoid_overlapped_widgets: true,
-        auto_init: true,
-        serialize_params: function($w, wgd) {
-            var url = $w.find('iframe').contents().get(0).location.href;
-            return {
-                col: wgd.col,
-                row: wgd.row,
-                size_x: wgd.size_x,
-                size_y: wgd.size_y,
-                src: url,
-            };
-        },
-        collision: {},
-        draggable: {
-            items: '.gs-w',
-            distance: 4,
-            ignore_dragging: Draggable.defaults.ignore_dragging.slice(0)
-        },
-        resize: {
-            enabled: false,
-            axes: ['both'],
-            handle_append_to: '',
-            handle_class: 'gs-resize-handle',
-            max_size: [Infinity, Infinity],
-            min_size: [1, 1]
-        },
-        header: {
-            enabled: true,
-            axes: ['both'],
-            handle_append_to: '',
-            handle_class: 'gs-header'
-        }
-    };
-
-    /**
-    * @class Gridster
-    * @uses Draggable
-    * @uses Collision
-    * @param {HTMLElement} el The HTMLelement that contains all the widgets.
-    * @param {Object} [options] An Object with all options you want to
-    *        overwrite:
-    *    @param {HTMLElement|String} [options.widget_selector] Define who will
-    *     be the draggable widgets. Can be a CSS Selector String or a
-    *     collection of HTMLElements
-    *    @param {Array} [options.widget_margins] Margin between widgets.
-    *     The first index for the horizontal margin (left, right) and
-    *     the second for the vertical margin (top, bottom).
-    *    @param {Array} [options.widget_base_dimensions] Base widget dimensions
-    *     in pixels. The first index for the width and the second for the
-    *     height.
-    *    @param {Number} [options.extra_cols] Add more columns in addition to
-    *     those that have been calculated.
-    *    @param {Number} [options.extra_rows] Add more rows in addition to
-    *     those that have been calculated.
-    *    @param {Number} [options.min_cols] The minimum required columns.
-    *    @param {Number} [options.max_cols] The maximum columns possible (set to null
-    *     for no maximum).
-    *    @param {Number} [options.min_rows] The minimum required rows.
-    *    @param {Number} [options.max_size_x] The maximum number of columns
-    *     that a widget can span.
-    *    @param {Boolean} [options.autogenerate_stylesheet] If true, all the
-    *     CSS required to position all widgets in their respective columns
-    *     and rows will be generated automatically and injected to the
-    *     `<head>` of the document. You can set this to false, and write
-    *     your own CSS targeting rows and cols via data-attributes like so:
-    *     `[data-col="1"] { left: 10px; }`
-    *    @param {Boolean} [options.avoid_overlapped_widgets] Avoid that widgets loaded
-    *     from the DOM can be overlapped. It is helpful if the positions were
-    *     bad stored in the database or if there was any conflict.
-    *    @param {Boolean} [options.auto_init] Automatically call gridster init
-    *     method or not when the plugin is instantiated.
-    *    @param {Function} [options.serialize_params] Return the data you want
-    *     for each widget in the serialization. Two arguments are passed:
-    *     `$w`: the jQuery wrapped HTMLElement, and `wgd`: the grid
-    *     coords object (`col`, `row`, `size_x`, `size_y`).
-    *    @param {Object} [options.collision] An Object with all options for
-    *     Collision class you want to overwrite. See Collision docs for
-    *     more info.
-    *    @param {Object} [options.draggable] An Object with all options for
-    *     Draggable class you want to overwrite. See Draggable docs for more
-    *     info.
-    *       @param {Object|Function} [options.draggable.ignore_dragging] Note that
-    *        if you use a Function, and resize is enabled, you should ignore the
-    *        resize handlers manually (options.resize.handle_class).
-    *    @param {Object} [options.resize] An Object with resize config options.
-    *       @param {Boolean} [options.resize.enabled] Set to true to enable
-    *        resizing.
-    *       @param {Array} [options.resize.axes] Axes in which widgets can be
-    *        resized. Possible values: ['x', 'y', 'both'].
-    *       @param {String} [options.resize.handle_append_to] Set a valid CSS
-    *        selector to append resize handles to.
-    *       @param {String} [options.resize.handle_class] CSS class name used
-    *        by resize handles.
-    *       @param {Array} [options.resize.max_size] Limit widget dimensions
-    *        when resizing. Array values should be integers:
-    *        `[max_cols_occupied, max_rows_occupied]`
-    *       @param {Array} [options.resize.min_size] Limit widget dimensions
-    *        when resizing. Array values should be integers:
-    *        `[min_cols_occupied, min_rows_occupied]`
-    *       @param {Function} [options.resize.start] Function executed
-    *        when resizing starts.
-    *       @param {Function} [otions.resize.resize] Function executed
-    *        during the resizing.
-    *       @param {Function} [options.resize.stop] Function executed
-    *        when resizing stops.
-    *
-    * @constructor
-    */
-    function Gridster(el, options) {
-        this.options = $.extend(true, {}, defaults, options);
-        this.$el = $(el);
-        this.$wrapper = this.$el.parent();
-        this.$widgets = this.$el.children(
-            this.options.widget_selector).addClass('gs-w');
-        this.widgets = [];
-        this.$changed = $([]);
-        this.wrapper_width = this.$wrapper.width();
-        this.min_widget_width = (this.options.widget_margins[0] * 2) +
-          this.options.widget_base_dimensions[0];
-        this.min_widget_height = (this.options.widget_margins[1] * 2) +
-          this.options.widget_base_dimensions[1];
-
-        this.generated_stylesheets = [];
-        this.$style_tags = $([]);
-
-        this.options.auto_init && this.init();
-    }
-
-    Gridster.defaults = defaults;
-    Gridster.generated_stylesheets = [];
-
-
-    /**
-    * Sorts an Array of grid coords objects (representing the grid coords of
-    * each widget) in ascending way.
-    *
-    * @method sort_by_row_asc
-    * @param {Array} widgets Array of grid coords objects
-    * @return {Array} Returns the array sorted.
-    */
-    Gridster.sort_by_row_asc = function(widgets) {
-        widgets = widgets.sort(function(a, b) {
-            if (!a.row) {
-                a = $(a).coords().grid;
-                b = $(b).coords().grid;
-            }
-
-           if (a.row > b.row) {
-               return 1;
-           }
-           return -1;
-        });
-
-        return widgets;
-    };
-
-
-    /**
-    * Sorts an Array of grid coords objects (representing the grid coords of
-    * each widget) placing first the empty cells upper left.
-    *
-    * @method sort_by_row_and_col_asc
-    * @param {Array} widgets Array of grid coords objects
-    * @return {Array} Returns the array sorted.
-    */
-    Gridster.sort_by_row_and_col_asc = function(widgets) {
-        widgets = widgets.sort(function(a, b) {
-           if (a.row > b.row || a.row === b.row && a.col > b.col) {
-               return 1;
-           }
-           return -1;
-        });
-
-        return widgets;
-    };
-
-
-    /**
-    * Sorts an Array of grid coords objects by column (representing the grid
-    * coords of each widget) in ascending way.
-    *
-    * @method sort_by_col_asc
-    * @param {Array} widgets Array of grid coords objects
-    * @return {Array} Returns the array sorted.
-    */
-    Gridster.sort_by_col_asc = function(widgets) {
-        widgets = widgets.sort(function(a, b) {
-           if (a.col > b.col) {
-               return 1;
-           }
-           return -1;
-        });
-
-        return widgets;
-    };
-
-
-    /**
-    * Sorts an Array of grid coords objects (representing the grid coords of
-    * each widget) in descending way.
-    *
-    * @method sort_by_row_desc
-    * @param {Array} widgets Array of grid coords objects
-    * @return {Array} Returns the array sorted.
-    */
-    Gridster.sort_by_row_desc = function(widgets) {
-        widgets = widgets.sort(function(a, b) {
-            if (a.row + a.size_y < b.row + b.size_y) {
-                return 1;
-            }
-           return -1;
-        });
-        return widgets;
-    };
-
-
-
-    /** Instance Methods **/
-
-    var fn = Gridster.prototype;
-
-    fn.init = function() {
-        this.options.resize.enabled && this.setup_resize();
-        this.options.header.enabled && this.setup_header();
-        this.generate_grid_and_stylesheet();
-        this.get_widgets_from_DOM();
-        this.set_dom_grid_height();
-        this.set_dom_grid_width();
-        this.$wrapper.addClass('ready');
-        this.draggable();
-        this.options.resize.enabled && this.resizable();
-
-        $(window).bind('resize.gridster', throttle(
-            $.proxy(this.recalculate_faux_grid, this), 200));
-    };
-
-
-    /**
-    * Disables dragging.
-    *
-    * @method disable
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.disable = function() {
-        this.$wrapper.find('.player-revert').removeClass('player-revert');
-        this.drag_api.disable();
-        return this;
-    };
-
-
-    /**
-    * Enables dragging.
-    *
-    * @method enable
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.enable = function() {
-        this.drag_api.enable();
-        return this;
-    };
-
-
-
-    /**
-    * Disables drag-and-drop widget resizing.
-    *
-    * @method disable
-    * @return {Class} Returns instance of gridster Class.
-    */
-    fn.disable_resize = function() {
-        this.$el.addClass('gs-resize-disabled');
-        this.resize_api.disable();
-        return this;
-    };
-
-
-    /**
-    * Enables drag-and-drop widget resizing.
-    *
-    * @method enable
-    * @return {Class} Returns instance of gridster Class.
-    */
-    fn.enable_resize = function() {
-        this.$el.removeClass('gs-resize-disabled');
-        this.resize_api.enable();
-        return this;
-    };
-
-
-    /**
-    * Add a new widget to the grid.
-    *
-    * @method add_widget
-    * @param {URI} url of the widget
-    *  or the HTMLElement.
-    * @param {Number} [size_x] The nº of rows the widget occupies horizontally.
-    * @param {Number} [size_y] The nº of columns the widget occupies vertically.
-    * @param {Number} [col] The column the widget should start in.
-    * @param {Number} [row] The row the widget should start in.
-    * @param {Array} [max_size] max_size Maximun size (in units) for width and height.
-    * @param {Array} [min_size] min_size Minimum size (in units) for width and height.
-    * @return {HTMLElement} Returns the jQuery wrapped HTMLElement representing.
-    *  the widget that was just created.
-    */
-    fn.add_widget = function(url, size_x, size_y, col, row, max_size, min_size) {
-        var pos;
-        size_x || (size_x = 1);
-        size_y || (size_y = 1);
-
-        if (!col & !row) {
-            pos = this.next_position(size_x, size_y);
-        } else {
-            pos = {
-                col: col,
-                row: row,
-                size_x: size_x,
-                size_y: size_y
-            };
-
-            this.empty_cells(col, row, size_x, size_y);
-        }
-        var html = '<li><iframe src="'+url+'" seamless /></li>';
-        var $w = $(html).attr({
-                'data-col': pos.col,
-                'data-row': pos.row,
-                'data-sizex' : size_x,
-                'data-sizey' : size_y
-            }).addClass('gs-w').appendTo(this.$el).hide();
-
-        this.$widgets = this.$widgets.add($w);
-
-        this.register_widget($w);
-
-        this.add_faux_rows(pos.size_y);
-        //this.add_faux_cols(pos.size_x);
-
-        if (max_size) {
-            this.set_widget_max_size($w, max_size);
-        }
-
-        if (min_size) {
-            this.set_widget_min_size($w, min_size);
-        }
-
-        this.set_dom_grid_width();
-        this.set_dom_grid_height();
-
-        this.drag_api.set_limits(this.cols * this.min_widget_width);
-
-        return $w.fadeIn();
-    };
-
-
-    /**
-    * Change widget size limits.
-    *
-    * @method set_widget_min_size
-    * @param {HTMLElement|Number} $widget The jQuery wrapped HTMLElement
-    *  representing the widget or an index representing the desired widget.
-    * @param {Array} min_size Minimum size (in units) for width and height.
-    * @return {HTMLElement} Returns instance of gridster Class.
-    */
-    fn.set_widget_min_size = function($widget, min_size) {
-        $widget = typeof $widget === 'number' ?
-            this.$widgets.eq($widget) : $widget;
-
-        if (!$widget.length) { return this; }
-
-        var wgd = $widget.data('coords').grid;
-        wgd.min_size_x = min_size[0];
-        wgd.min_size_y = min_size[1];
-
-        return this;
-    };
-
-
-    /**
-    * Change widget size limits.
-    *
-    * @method set_widget_max_size
-    * @param {HTMLElement|Number} $widget The jQuery wrapped HTMLElement
-    *  representing the widget or an index representing the desired widget.
-    * @param {Array} max_size Maximun size (in units) for width and height.
-    * @return {HTMLElement} Returns instance of gridster Class.
-    */
-    fn.set_widget_max_size = function($widget, max_size) {
-        $widget = typeof $widget === 'number' ?
-            this.$widgets.eq($widget) : $widget;
-
-        if (!$widget.length) { return this; }
-
-        var wgd = $widget.data('coords').grid;
-        wgd.max_size_x = max_size[0];
-        wgd.max_size_y = max_size[1];
-
-        return this;
-    };
-
-
-    /**
-    * Append the resize handle into a widget.
-    *
-    * @method add_resize_handle
-    * @param {HTMLElement} $widget The jQuery wrapped HTMLElement
-    *  representing the widget.
-    * @return {HTMLElement} Returns instance of gridster Class.
-    */
-    fn.add_resize_handle = function($w) {
-        var append_to = this.options.resize.handle_append_to;
-        $(this.resize_handle_tpl).appendTo( append_to ? $(append_to, $w) : $w);
-
-        return this;
-    };
-
-
-    /**
-    * Append the header handle into a widget.
-    *
-    * @method add_header_handle
-    * @param {HTMLElement} $widget The jQuery wrapped HTMLElement
-    *  representing the widget.
-    * @return {HTMLElement} Returns instance of gridster Class.
-    */
-    fn.add_header_handle = function($w) {
-        var append_to = this.options.header.handle_append_to;
-        $(this.header_handle_tpl).appendTo( append_to ? $(append_to, $w) : $w);
-
-        return this;
-    };
-
-
-    /**
-    * Change the size of a widget. Width is limited to the current grid width.
-    *
-    * @method resize_widget
-    * @param {HTMLElement} $widget The jQuery wrapped HTMLElement
-    *  representing the widget.
-    * @param {Number} size_x The number of columns that will occupy the widget.
-    *  By default <code>size_x</code> is limited to the space available from
-    *  the column where the widget begins, until the last column to the right.
-    * @param {Number} size_y The number of rows that will occupy the widget.
-    * @param {Function} [callback] Function executed when the widget is removed.
-    * @return {HTMLElement} Returns $widget.
-    */
-    fn.resize_widget = function($widget, size_x, size_y, callback) {
-        var wgd = $widget.coords().grid;
-        var col = wgd.col;
-        var max_cols = this.options.max_cols;
-        var old_size_y = wgd.size_y;
-        var old_col = wgd.col;
-        var new_col = old_col;
-
-        size_x || (size_x = wgd.size_x);
-        size_y || (size_y = wgd.size_y);
-
-        if (max_cols !== Infinity) {
-            size_x = Math.min(size_x, max_cols - col + 1);
-        }
-
-        if (size_y > old_size_y) {
-            this.add_faux_rows(Math.max(size_y - old_size_y, 0));
-        }
-
-        var player_rcol = (col + size_x - 1);
-        if (player_rcol > this.cols) {
-            this.add_faux_cols(player_rcol - this.cols);
-        }
-
-        var new_grid_data = {
-            col: new_col,
-            row: wgd.row,
-            size_x: size_x,
-            size_y: size_y
-        };
-
-        this.mutate_widget_in_gridmap($widget, wgd, new_grid_data);
-
-        this.set_dom_grid_height();
-        this.set_dom_grid_width();
-
-        if (callback) {
-            callback.call(this, new_grid_data.size_x, new_grid_data.size_y);
-        }
-
-        return $widget;
-    };
-
-
-    /**
-    * Mutate widget dimensions and position in the grid map.
-    *
-    * @method mutate_widget_in_gridmap
-    * @param {HTMLElement} $widget The jQuery wrapped HTMLElement
-    *  representing the widget to mutate.
-    * @param {Object} wgd Current widget grid data (col, row, size_x, size_y).
-    * @param {Object} new_wgd New widget grid data.
-    * @return {HTMLElement} Returns instance of gridster Class.
-    */
-    fn.mutate_widget_in_gridmap = function($widget, wgd, new_wgd) {
-        var old_size_x = wgd.size_x;
-        var old_size_y = wgd.size_y;
-
-        var old_cells_occupied = this.get_cells_occupied(wgd);
-        var new_cells_occupied = this.get_cells_occupied(new_wgd);
-
-        var empty_cols = [];
-        $.each(old_cells_occupied.cols, function(i, col) {
-            if ($.inArray(col, new_cells_occupied.cols) === -1) {
-                empty_cols.push(col);
-            }
-        });
-
-        var occupied_cols = [];
-        $.each(new_cells_occupied.cols, function(i, col) {
-            if ($.inArray(col, old_cells_occupied.cols) === -1) {
-                occupied_cols.push(col);
-            }
-        });
-
-        var empty_rows = [];
-        $.each(old_cells_occupied.rows, function(i, row) {
-            if ($.inArray(row, new_cells_occupied.rows) === -1) {
-                empty_rows.push(row);
-            }
-        });
-
-        var occupied_rows = [];
-        $.each(new_cells_occupied.rows, function(i, row) {
-            if ($.inArray(row, old_cells_occupied.rows) === -1) {
-                occupied_rows.push(row);
-            }
-        });
-
-        this.remove_from_gridmap(wgd);
-
-        if (occupied_cols.length) {
-            var cols_to_empty = [
-                new_wgd.col, new_wgd.row, new_wgd.size_x, Math.min(old_size_y, new_wgd.size_y), $widget
-            ];
-            this.empty_cells.apply(this, cols_to_empty);
-        }
-
-        if (occupied_rows.length) {
-            var rows_to_empty = [new_wgd.col, new_wgd.row, new_wgd.size_x, new_wgd.size_y, $widget];
-            this.empty_cells.apply(this, rows_to_empty);
-        }
-
-        // not the same that wgd = new_wgd;
-        wgd.col = new_wgd.col;
-        wgd.row = new_wgd.row;
-        wgd.size_x = new_wgd.size_x;
-        wgd.size_y = new_wgd.size_y;
-
-        this.add_to_gridmap(new_wgd, $widget);
-
-        $widget.removeClass('player-revert');
-
-        //update coords instance attributes
-        $widget.data('coords').update({
-            width: (new_wgd.size_x * this.options.widget_base_dimensions[0] +
-                ((new_wgd.size_x - 1) * this.options.widget_margins[0]) * 2),
-            height: (new_wgd.size_y * this.options.widget_base_dimensions[1] +
-                ((new_wgd.size_y - 1) * this.options.widget_margins[1]) * 2)
-        });
-
-        $widget.attr({
-            'data-col': new_wgd.col,
-            'data-row': new_wgd.row,
-            'data-sizex': new_wgd.size_x,
-            'data-sizey': new_wgd.size_y
-        });
-
-        if (empty_cols.length) {
-            var cols_to_remove_holes = [
-                empty_cols[0], new_wgd.row,
-                empty_cols.length,
-                Math.min(old_size_y, new_wgd.size_y),
-                $widget
-            ];
-
-            this.remove_empty_cells.apply(this, cols_to_remove_holes);
-        }
-
-        if (empty_rows.length) {
-            var rows_to_remove_holes = [
-                new_wgd.col, new_wgd.row, new_wgd.size_x, new_wgd.size_y, $widget
-            ];
-            this.remove_empty_cells.apply(this, rows_to_remove_holes);
-        }
-
-        this.move_widget_up($widget);
-
-        return this;
-    };
-
-
-    /**
-    * Move down widgets in cells represented by the arguments col, row, size_x,
-    * size_y
-    *
-    * @method empty_cells
-    * @param {Number} col The column where the group of cells begin.
-    * @param {Number} row The row where the group of cells begin.
-    * @param {Number} size_x The number of columns that the group of cells
-    * occupy.
-    * @param {Number} size_y The number of rows that the group of cells
-    * occupy.
-    * @param {HTMLElement} $exclude Exclude widgets from being moved.
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.empty_cells = function(col, row, size_x, size_y, $exclude) {
-        var $nexts = this.widgets_below({
-                col: col,
-                row: row - size_y,
-                size_x: size_x,
-                size_y: size_y
-            });
-
-        $nexts.not($exclude).each($.proxy(function(i, w) {
-            var wgd = $(w).coords().grid;
-            if ( !(wgd.row <= (row + size_y - 1))) { return; }
-            var diff =  (row + size_y) - wgd.row;
-            this.move_widget_down($(w), diff);
-        }, this));
-
-        this.set_dom_grid_height();
-
-        return this;
-    };
-
-
-    /**
-    * Move up widgets below cells represented by the arguments col, row, size_x,
-    * size_y.
-    *
-    * @method remove_empty_cells
-    * @param {Number} col The column where the group of cells begin.
-    * @param {Number} row The row where the group of cells begin.
-    * @param {Number} size_x The number of columns that the group of cells
-    * occupy.
-    * @param {Number} size_y The number of rows that the group of cells
-    * occupy.
-    * @param {HTMLElement} exclude Exclude widgets from being moved.
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.remove_empty_cells = function(col, row, size_x, size_y, exclude) {
-        var $nexts = this.widgets_below({
-            col: col,
-            row: row,
-            size_x: size_x,
-            size_y: size_y
-        });
-
-        $nexts.not(exclude).each($.proxy(function(i, widget) {
-            this.move_widget_up( $(widget), size_y );
-        }, this));
-
-        this.set_dom_grid_height();
-
-        return this;
-    };
-
-
-    /**
-    * Get the most left column below to add a new widget.
-    *
-    * @method next_position
-    * @param {Number} size_x The nº of rows the widget occupies horizontally.
-    * @param {Number} size_y The nº of columns the widget occupies vertically.
-    * @return {Object} Returns a grid coords object representing the future
-    *  widget coords.
-    */
-    fn.next_position = function(size_x, size_y) {
-        size_x || (size_x = 1);
-        size_y || (size_y = 1);
-        var ga = this.gridmap;
-        var cols_l = ga.length;
-        var valid_pos = [];
-        var rows_l;
-
-        for (var c = 1; c < cols_l; c++) {
-            rows_l = ga[c].length;
-            for (var r = 1; r <= rows_l; r++) {
-                var can_move_to = this.can_move_to({
-                    size_x: size_x,
-                    size_y: size_y
-                }, c, r);
-
-                if (can_move_to) {
-                    valid_pos.push({
-                        col: c,
-                        row: r,
-                        size_y: size_y,
-                        size_x: size_x
-                    });
-                }
-            }
-        }
-
-        if (valid_pos.length) {
-            return Gridster.sort_by_row_and_col_asc(valid_pos)[0];
-        }
-        return false;
-    };
-
-
-    /**
-    * Remove a widget from the grid.
-    *
-    * @method remove_widget
-    * @param {HTMLElement} el The jQuery wrapped HTMLElement you want to remove.
-    * @param {Boolean|Function} silent If true, widgets below the removed one
-    * will not move up. If a Function is passed it will be used as callback.
-    * @param {Function} callback Function executed when the widget is removed.
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.remove_widget = function(el, silent, callback) {
-        var $el = el instanceof $ ? el : $(el);
-        var wgd = $el.coords().grid;
-
-        // if silent is a function assume it's a callback
-        if ($.isFunction(silent)) {
-            callback = silent;
-            silent = false;
-        }
-
-        this.cells_occupied_by_placeholder = {};
-        this.$widgets = this.$widgets.not($el);
-
-        var $nexts = this.widgets_below($el);
-
-        this.remove_from_gridmap(wgd);
-
-        $el.fadeOut($.proxy(function() {
-            $el.remove();
-
-            if (!silent) {
-                $nexts.each($.proxy(function(i, widget) {
-                    this.move_widget_up( $(widget), wgd.size_y );
-                }, this));
-            }
-
-            this.set_dom_grid_height();
-
-            if (callback) {
-                callback.call(this, el);
-            }
-        }, this));
-
-        return this;
-    };
-
-
-    /**
-    * Remove all widgets from the grid.
-    *
-    * @method remove_all_widgets
-    * @param {Function} callback Function executed for each widget removed.
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.remove_all_widgets = function(callback) {
-        this.$widgets.each($.proxy(function(i, el){
-              this.remove_widget(el, true, callback);
-        }, this));
-
-        return this;
-    };
-
-
-    /**
-    * Returns a serialized array of the widgets in the grid.
-    *
-    * @method serialize
-    * @param {HTMLElement} [$widgets] The collection of jQuery wrapped
-    *  HTMLElements you want to serialize. If no argument is passed all widgets
-    *  will be serialized.
-    * @return {Array} Returns an Array of Objects with the data specified in
-    *  the serialize_params option.
-    */
-    fn.serialize = function($widgets) {
-        $widgets || ($widgets = this.$widgets);
-
-        return $widgets.map($.proxy(function(i, widget) {
-            var $w = $(widget);
-            return this.options.serialize_params($w, $w.coords().grid);
-        }, this)).get();
-    };
-
-
-    /**
-    * Returns a serialized array of the widgets that have changed their
-    *  position.
-    *
-    * @method serialize_changed
-    * @return {Array} Returns an Array of Objects with the data specified in
-    *  the serialize_params option.
-    */
-    fn.serialize_changed = function() {
-        return this.serialize(this.$changed);
-    };
-
-
-    /**
-    * Convert widgets from DOM elements to "widget grid data" Objects.
-    *
-    * @method dom_to_coords
-    * @param {HTMLElement} $widget The widget to be converted.
-    */
-    fn.dom_to_coords = function($widget) {
-        return {
-            'col': parseInt($widget.attr('data-col'), 10),
-            'row': parseInt($widget.attr('data-row'), 10),
-            'size_x': parseInt($widget.attr('data-sizex'), 10) || 1,
-            'size_y': parseInt($widget.attr('data-sizey'), 10) || 1,
-            'max_size_x': parseInt($widget.attr('data-max-sizex'), 10) || false,
-            'max_size_y': parseInt($widget.attr('data-max-sizey'), 10) || false,
-            'min_size_x': parseInt($widget.attr('data-min-sizex'), 10) || false,
-            'min_size_y': parseInt($widget.attr('data-min-sizey'), 10) || false,
-            'el': $widget
-        };
-    };
-
-
-    /**
-    * Creates the grid coords object representing the widget an add it to the
-    * mapped array of positions.
-    *
-    * @method register_widget
-    * @param {HTMLElement|Object} $el jQuery wrapped HTMLElement representing
-    *  the widget, or an "widget grid data" Object with (col, row, el ...).
-    * @return {Boolean} Returns true if the widget final position is different
-    *  than the original.
-    */
-    fn.register_widget = function($el) {
-        var isDOM = $el instanceof jQuery;
-        var wgd = isDOM ? this.dom_to_coords($el) : $el;
-        var posChanged = false;
-        isDOM || ($el = wgd.el);
-
-        var empty_upper_row = this.can_go_widget_up(wgd);
-        if (empty_upper_row) {
-            wgd.row = empty_upper_row;
-            $el.attr('data-row', empty_upper_row);
-            this.$el.trigger('gridster:positionchanged', [wgd]);
-            posChanged = true;
-        }
-
-        if (this.options.avoid_overlapped_widgets &&
-            !this.can_move_to(
-             {size_x: wgd.size_x, size_y: wgd.size_y}, wgd.col, wgd.row)
-        ) {
-            $.extend(wgd, this.next_position(wgd.size_x, wgd.size_y));
-            $el.attr({
-                'data-col': wgd.col,
-                'data-row': wgd.row,
-                'data-sizex': wgd.size_x,
-                'data-sizey': wgd.size_y
-            });
-            posChanged = true;
-        }
-
-        // attach Coord object to player data-coord attribute
-        $el.data('coords', $el.coords());
-        // Extend Coord object with grid position info
-        $el.data('coords').grid = wgd;
-
-        this.add_to_gridmap(wgd, $el);
-
-        this.options.resize.enabled && this.add_resize_handle($el);
-        this.options.header.enabled && this.add_header_handle($el);
-
-        return posChanged;
-    };
-
-
-    /**
-    * Update in the mapped array of positions the value of cells represented by
-    * the grid coords object passed in the `grid_data` param.
-    *
-    * @param {Object} grid_data The grid coords object representing the cells
-    *  to update in the mapped array.
-    * @param {HTMLElement|Boolean} value Pass `false` or the jQuery wrapped
-    *  HTMLElement, depends if you want to delete an existing position or add
-    *  a new one.
-    * @method update_widget_position
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.update_widget_position = function(grid_data, value) {
-        this.for_each_cell_occupied(grid_data, function(col, row) {
-            if (!this.gridmap[col]) { return this; }
-            this.gridmap[col][row] = value;
-        });
-        return this;
-    };
-
-
-    /**
-    * Remove a widget from the mapped array of positions.
-    *
-    * @method remove_from_gridmap
-    * @param {Object} grid_data The grid coords object representing the cells
-    *  to update in the mapped array.
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.remove_from_gridmap = function(grid_data) {
-        return this.update_widget_position(grid_data, false);
-    };
-
-
-    /**
-    * Add a widget to the mapped array of positions.
-    *
-    * @method add_to_gridmap
-    * @param {Object} grid_data The grid coords object representing the cells
-    *  to update in the mapped array.
-    * @param {HTMLElement|Boolean} value The value to set in the specified
-    *  position .
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.add_to_gridmap = function(grid_data, value) {
-        this.update_widget_position(grid_data, value || grid_data.el);
-
-        if (grid_data.el) {
-            var $widgets = this.widgets_below(grid_data.el);
-            $widgets.each($.proxy(function(i, widget) {
-                this.move_widget_up( $(widget));
-            }, this));
-        }
-    };
-
-
-    /**
-    * Make widgets draggable.
-    *
-    * @uses Draggable
-    * @method draggable
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.draggable = function() {
-        var self = this;
-        var draggable_options = $.extend(true, {}, this.options.draggable, {
-            offset_left: this.options.widget_margins[0],
-            offset_top: this.options.widget_margins[1],
-            container_width: this.cols * this.min_widget_width,
-            limit: true,
-            start: function(event, ui) {
-                self.$widgets.filter('.player-revert')
-                    .removeClass('player-revert');
-
-                self.$player = $(this);
-                self.$helper = $(ui.$helper);
-
-                self.helper = !self.$helper.is(self.$player);
-
-                self.on_start_drag.call(self, event, ui);
-                self.$el.trigger('gridster:dragstart');
-            },
-            stop: function(event, ui) {
-                self.on_stop_drag.call(self, event, ui);
-                self.$el.trigger('gridster:dragstop');
-            },
-            drag: throttle(function(event, ui) {
-                self.on_drag.call(self, event, ui);
-                self.$el.trigger('gridster:drag');
-            }, 60)
-          });
-
-        this.drag_api = this.$el.drag(draggable_options);
-        return this;
-    };
-
-
-    /**
-    * Bind resize events to get resize working.
-    *
-    * @method resizable
-    * @return {Class} Returns instance of gridster Class.
-    */
-    fn.resizable = function() {
-        this.resize_api = this.$el.drag({
-            items: '.' + this.options.resize.handle_class,
-            offset_left: this.options.widget_margins[0],
-            container_width: this.container_width,
-            move_element: false,
-            resize: true,
-            limit: this.options.autogrow_cols ? false : true,
-            start: $.proxy(this.on_start_resize, this),
-            stop: $.proxy(function(event, ui) {
-                delay($.proxy(function() {
-                    this.on_stop_resize(event, ui);
-                }, this), 120);
-            }, this),
-            drag: throttle($.proxy(this.on_resize, this), 60)
-        });
-
-        return this;
-    };
-
-
-    /**
-    * Setup things required for resizing. Like build templates for drag handles.
-    *
-    * @method setup_resize
-    * @return {Class} Returns instance of gridster Class.
-    */
-    fn.setup_resize = function() {
-        this.resize_handle_class = this.options.resize.handle_class;
-        var axes = this.options.resize.axes;
-        var handle_tpl = '<span class="' + this.resize_handle_class + ' ' +
-            this.resize_handle_class + '-{type}" />';
-
-        this.resize_handle_tpl = $.map(axes, function(type) {
-            return handle_tpl.replace('{type}', type);
-        }).join('');
-
-        if ($.isArray(this.options.draggable.ignore_dragging)) {
-            this.options.draggable.ignore_dragging.push(
-                '.' + this.resize_handle_class);
-        }
-
-        return this;
-    };
-
-
-    /**
-    * Setup header required for dragging, zoom, and close handles.
-    *
-    * @method setup_header
-    * @return {Class} Returns instance of gridster Class.
-    */
-    fn.setup_header = function() {
-        this.header_handle_class = this.options.header.handle_class;
-        var axes = this.options.header.axes;
-        var handle_tpl = '<header class="gs-header">'+
-            '<span class="gs-icon gs-close-handle" onClick="remove_widget(this);"></span>' +
-            '<span class="gs-icon gs-zoom-handle" onClick="zoom_widget(this);"></span>' +
-            '</header><div class="overlay_fix"/>';
-
-        this.header_handle_tpl = $.map(axes, function(type) {
-            return handle_tpl;
-        }).join('');
-
-        return this;
-    };
-
-    /**
-    * This function is executed when the player begins to be dragged.
-    *
-    * @method on_start_drag
-    * @param {Event} event The original browser event
-    * @param {Object} ui A prepared ui object with useful drag-related data
-    */
-    fn.on_start_drag = function(event, ui) {
-        this.$helper.add(this.$player).add(this.$wrapper).addClass('dragging');
-
-        this.highest_col = this.get_highest_occupied_cell().col;
-
-        this.$player.addClass('player');
-        this.player_grid_data = this.$player.coords().grid;
-        this.placeholder_grid_data = $.extend({}, this.player_grid_data);
-
-        this.set_dom_grid_height(this.$el.height() +
-            (this.player_grid_data.size_y * this.min_widget_height));
-
-        this.set_dom_grid_width(this.cols);
-
-        var pgd_sizex = this.player_grid_data.size_x;
-        var cols_diff = this.cols - this.highest_col;
-
-        if (this.options.autogrow_cols && cols_diff <= pgd_sizex) {
-            this.add_faux_cols(Math.min(pgd_sizex - cols_diff, 1));
-        }
-
-        var colliders = this.faux_grid;
-        var coords = this.$player.data('coords').coords;
-
-        this.cells_occupied_by_player = this.get_cells_occupied(
-            this.player_grid_data);
-        this.cells_occupied_by_placeholder = this.get_cells_occupied(
-            this.placeholder_grid_data);
-
-        this.last_cols = [];
-        this.last_rows = [];
-
-        // see jquery.collision.js
-        this.collision_api = this.$helper.collision(
-            colliders, this.options.collision);
-
-        this.$preview_holder = $('<' + this.$player.get(0).tagName + ' />', {
-              'class': 'preview-holder',
-              'data-row': this.$player.attr('data-row'),
-              'data-col': this.$player.attr('data-col'),
-              css: {
-                  width: coords.width,
-                  height: coords.height
-              }
-        }).appendTo(this.$el);
-
-        if (this.options.draggable.start) {
-          this.options.draggable.start.call(this, event, ui);
-        }
-    };
-
-
-    /**
-    * This function is executed when the player is being dragged.
-    *
-    * @method on_drag
-    * @param {Event} event The original browser event
-    * @param {Object} ui A prepared ui object with useful drag-related data
-    */
-    fn.on_drag = function(event, ui) {
-        //break if dragstop has been fired
-        if (this.$player === null) {
-            return false;
-        }
-
-        var abs_offset = {
-            left: ui.position.left + this.baseX,
-            top: ui.position.top + this.baseY
-        };
-
-        // auto grow cols
-        if (this.options.autogrow_cols) {
-            var prcol = this.placeholder_grid_data.col +
-                this.placeholder_grid_data.size_x - 1;
-
-            // "- 1" due to adding at least 1 column in on_start_drag
-            if (prcol >= this.cols - 1 && this.options.max_cols >= this.cols + 1) {
-                this.add_faux_cols(1);
-                this.set_dom_grid_width(this.cols + 1);
-                this.drag_api.set_limits(this.container_width);
-            }
-
-            this.collision_api.set_colliders(this.faux_grid);
-        }
-
-        this.colliders_data = this.collision_api.get_closest_colliders(
-            abs_offset);
-
-        this.on_overlapped_column_change(
-            this.on_start_overlapping_column, this.on_stop_overlapping_column);
-
-        this.on_overlapped_row_change(
-            this.on_start_overlapping_row, this.on_stop_overlapping_row);
-
-
-        if (this.helper && this.$player) {
-            this.$player.css({
-                'left': ui.position.left,
-                'top': ui.position.top
-            });
-        }
-
-        if (this.options.draggable.drag) {
-            this.options.draggable.drag.call(this, event, ui);
-        }
-    };
-
-
-    /**
-    * This function is executed when the player stops being dragged.
-    *
-    * @method on_stop_drag
-    * @param {Event} event The original browser event
-    * @param {Object} ui A prepared ui object with useful drag-related data
-    */
-    fn.on_stop_drag = function(event, ui) {
-        this.$helper.add(this.$player).add(this.$wrapper)
-            .removeClass('dragging');
-
-        ui.position.left = ui.position.left + this.baseX;
-        ui.position.top = ui.position.top + this.baseY;
-        this.colliders_data = this.collision_api.get_closest_colliders(
-            ui.position);
-
-        this.on_overlapped_column_change(
-            this.on_start_overlapping_column,
-            this.on_stop_overlapping_column
-        );
-
-        this.on_overlapped_row_change(
-            this.on_start_overlapping_row,
-            this.on_stop_overlapping_row
-        );
-
-        this.$player.addClass('player-revert').removeClass('player')
-            .attr({
-                'data-col': this.placeholder_grid_data.col,
-                'data-row': this.placeholder_grid_data.row
-            }).css({
-                'left': '',
-                'top': ''
-            });
-
-        this.$changed = this.$changed.add(this.$player);
-
-        this.cells_occupied_by_player = this.get_cells_occupied(
-            this.placeholder_grid_data);
-        this.set_cells_player_occupies(
-            this.placeholder_grid_data.col, this.placeholder_grid_data.row);
-
-        this.$player.coords().grid.row = this.placeholder_grid_data.row;
-        this.$player.coords().grid.col = this.placeholder_grid_data.col;
-
-        if (this.options.draggable.stop) {
-          this.options.draggable.stop.call(this, event, ui);
-        }
-
-        this.$preview_holder.remove();
-
-        this.$player = null;
-        this.$helper = null;
-        this.placeholder_grid_data = {};
-        this.player_grid_data = {};
-        this.cells_occupied_by_placeholder = {};
-        this.cells_occupied_by_player = {};
-
-        this.set_dom_grid_height();
-        this.set_dom_grid_width();
-
-        if (this.options.autogrow_cols) {
-            this.drag_api.set_limits(this.cols * this.min_widget_width);
-        }
-    };
-
-
-    /**
-    * This function is executed every time a widget starts to be resized.
-    *
-    * @method on_start_resize
-    * @param {Event} event The original browser event
-    * @param {Object} ui A prepared ui object with useful drag-related data
-    */
-    fn.on_start_resize = function(event, ui) {
-        this.$resized_widget = ui.$player.closest('.gs-w');
-        this.resize_coords = this.$resized_widget.coords();
-        this.resize_wgd = this.resize_coords.grid;
-        this.resize_initial_width = this.resize_coords.coords.width;
-        this.resize_initial_height = this.resize_coords.coords.height;
-        this.resize_initial_sizex = this.resize_coords.grid.size_x;
-        this.resize_initial_sizey = this.resize_coords.grid.size_y;
-        this.resize_initial_col = this.resize_coords.grid.col;
-        this.resize_last_sizex = this.resize_initial_sizex;
-        this.resize_last_sizey = this.resize_initial_sizey;
-
-        this.resize_max_size_x = Math.min(this.resize_wgd.max_size_x ||
-            this.options.resize.max_size[0],
-            this.options.max_cols - this.resize_initial_col + 1);
-        this.resize_max_size_y = this.resize_wgd.max_size_y ||
-            this.options.resize.max_size[1];
-
-        this.resize_min_size_x = (this.resize_wgd.min_size_x ||
-            this.options.resize.min_size[0] || 1);
-        this.resize_min_size_y = (this.resize_wgd.min_size_y ||
-            this.options.resize.min_size[1] || 1);
-
-        this.resize_initial_last_col = this.get_highest_occupied_cell().col;
-
-        this.set_dom_grid_width(this.cols);
-
-        this.resize_dir = {
-            right: ui.$player.is('.' + this.resize_handle_class + '-x'),
-            bottom: ui.$player.is('.' + this.resize_handle_class + '-y')
-        };
-
-        this.$resized_widget.css({
-            'min-width': this.options.widget_base_dimensions[0],
-            'min-height': this.options.widget_base_dimensions[1]
-        });
-
-        var nodeName = this.$resized_widget.get(0).tagName;
-        this.$resize_preview_holder = $('<' + nodeName + ' />', {
-              'class': 'preview-holder resize-preview-holder',
-              'data-row': this.$resized_widget.attr('data-row'),
-              'data-col': this.$resized_widget.attr('data-col'),
-              'css': {
-                  'width': this.resize_initial_width,
-                  'height': this.resize_initial_height
-              }
-        }).appendTo(this.$el);
-
-        this.$resized_widget.addClass('resizing');
-
-        if (this.options.resize.start) {
-            this.options.resize.start.call(this, event, ui, this.$resized_widget);
-        }
-
-        this.$el.trigger('gridster:resizestart');
-    };
-
-
-    /**
-    * This function is executed every time a widget stops being resized.
-    *
-    * @method on_stop_resize
-    * @param {Event} event The original browser event
-    * @param {Object} ui A prepared ui object with useful drag-related data
-    */
-    fn.on_stop_resize = function(event, ui) {
-        this.$resized_widget
-            .removeClass('resizing')
-            .css({
-                'width': '',
-                'height': ''
-            });
-
-        delay($.proxy(function() {
-            this.$resize_preview_holder
-                .remove()
-                .css({
-                    'min-width': '',
-                    'min-height': ''
-                });
-
-            if (this.options.resize.stop) {
-                this.options.resize.stop.call(this, event, ui, this.$resized_widget);
-            }
-
-            this.$el.trigger('gridster:resizestop');
-        }, this), 300);
-
-        this.set_dom_grid_width();
-
-        if (this.options.autogrow_cols) {
-            this.drag_api.set_limits(this.cols * this.min_widget_width);
-        }
-    };
-
-
-    /**
-    * This function is executed when a widget is being resized.
-    *
-    * @method on_resize
-    * @param {Event} event The original browser event
-    * @param {Object} ui A prepared ui object with useful drag-related data
-    */
-    fn.on_resize = function(event, ui) {
-        var rel_x = (ui.pointer.diff_left);
-        var rel_y = (ui.pointer.diff_top);
-        var wbd_x = this.options.widget_base_dimensions[0];
-        var wbd_y = this.options.widget_base_dimensions[1];
-        var margin_x = this.options.widget_margins[0];
-        var margin_y = this.options.widget_margins[1];
-        var max_size_x = this.resize_max_size_x;
-        var min_size_x = this.resize_min_size_x;
-        var max_size_y = this.resize_max_size_y;
-        var min_size_y = this.resize_min_size_y;
-        var autogrow = this.options.autogrow_cols;
-        var width;
-        var max_width = Infinity;
-        var max_height = Infinity;
-
-        var inc_units_x = Math.ceil((rel_x / (wbd_x + margin_x * 2)) - 0.2);
-        var inc_units_y = Math.ceil((rel_y / (wbd_y + margin_y * 2)) - 0.2);
-
-        var size_x = Math.max(1, this.resize_initial_sizex + inc_units_x);
-        var size_y = Math.max(1, this.resize_initial_sizey + inc_units_y);
-
-        var max_cols = (this.container_width / this.min_widget_width) -
-            this.resize_initial_col + 1;
-        var limit_width = ((max_cols * this.min_widget_width) - margin_x * 2);
-
-        size_x = Math.max(Math.min(size_x, max_size_x), min_size_x);
-        size_x = Math.min(max_cols, size_x);
-        width = (max_size_x * wbd_x) + ((size_x - 1) * margin_x * 2);
-        max_width = Math.min(width, limit_width);
-        min_width = (min_size_x * wbd_x) + ((size_x - 1) * margin_x * 2);
-
-        size_y = Math.max(Math.min(size_y, max_size_y), min_size_y);
-        max_height = (max_size_y * wbd_y) + ((size_y - 1) * margin_y * 2);
-        min_height = (min_size_y * wbd_y) + ((size_y - 1) * margin_y * 2);
-
-        if (this.resize_dir.right) {
-            size_y = this.resize_initial_sizey;
-        } else if (this.resize_dir.bottom) {
-            size_x = this.resize_initial_sizex;
-        }
-
-        if (autogrow) {
-            var last_widget_col = this.resize_initial_col + size_x - 1;
-            if (autogrow && this.resize_initial_last_col <= last_widget_col) {
-                this.set_dom_grid_width(Math.max(last_widget_col + 1, this.cols));
-
-                if (this.cols < last_widget_col) {
-                    this.add_faux_cols(last_widget_col - this.cols);
-                }
-            }
-        }
-
-        var css_props = {};
-        !this.resize_dir.bottom && (css_props.width = Math.max(Math.min(
-            this.resize_initial_width + rel_x, max_width), min_width));
-        !this.resize_dir.right && (css_props.height = Math.max(Math.min(
-            this.resize_initial_height + rel_y, max_height), min_height));
-
-        this.$resized_widget.css(css_props);
-
-        if (size_x !== this.resize_last_sizex ||
-            size_y !== this.resize_last_sizey) {
-
-            this.resize_widget(this.$resized_widget, size_x, size_y);
-            this.set_dom_grid_width(this.cols);
-
-            this.$resize_preview_holder.css({
-                'width': '',
-                'height': ''
-            }).attr({
-                'data-row': this.$resized_widget.attr('data-row'),
-                'data-sizex': size_x,
-                'data-sizey': size_y
-            });
-        }
-
-        if (this.options.resize.resize) {
-            this.options.resize.resize.call(this, event, ui, this.$resized_widget);
-        }
-
-        this.$el.trigger('gridster:resize');
-
-        this.resize_last_sizex = size_x;
-        this.resize_last_sizey = size_y;
-    };
-
-
-    /**
-    * Executes the callbacks passed as arguments when a column begins to be
-    * overlapped or stops being overlapped.
-    *
-    * @param {Function} start_callback Function executed when a new column
-    *  begins to be overlapped. The column is passed as first argument.
-    * @param {Function} stop_callback Function executed when a column stops
-    *  being overlapped. The column is passed as first argument.
-    * @method on_overlapped_column_change
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.on_overlapped_column_change = function(start_callback, stop_callback) {
-        if (!this.colliders_data.length) {
-            return this;
-        }
-        var cols = this.get_targeted_columns(
-            this.colliders_data[0].el.data.col);
-
-        var last_n_cols = this.last_cols.length;
-        var n_cols = cols.length;
-        var i;
-
-        for (i = 0; i < n_cols; i++) {
-            if ($.inArray(cols[i], this.last_cols) === -1) {
-                (start_callback || $.noop).call(this, cols[i]);
-            }
-        }
-
-        for (i = 0; i< last_n_cols; i++) {
-            if ($.inArray(this.last_cols[i], cols) === -1) {
-                (stop_callback || $.noop).call(this, this.last_cols[i]);
-            }
-        }
-
-        this.last_cols = cols;
-
-        return this;
-    };
-
-
-    /**
-    * Executes the callbacks passed as arguments when a row starts to be
-    * overlapped or stops being overlapped.
-    *
-    * @param {Function} start_callback Function executed when a new row begins
-    *  to be overlapped. The row is passed as first argument.
-    * @param {Function} end_callback Function executed when a row stops being
-    *  overlapped. The row is passed as first argument.
-    * @method on_overlapped_row_change
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.on_overlapped_row_change = function(start_callback, end_callback) {
-        if (!this.colliders_data.length) {
-            return this;
-        }
-        var rows = this.get_targeted_rows(this.colliders_data[0].el.data.row);
-        var last_n_rows = this.last_rows.length;
-        var n_rows = rows.length;
-        var i;
-
-        for (i = 0; i < n_rows; i++) {
-            if ($.inArray(rows[i], this.last_rows) === -1) {
-                (start_callback || $.noop).call(this, rows[i]);
-            }
-        }
-
-        for (i = 0; i < last_n_rows; i++) {
-            if ($.inArray(this.last_rows[i], rows) === -1) {
-                (end_callback || $.noop).call(this, this.last_rows[i]);
-            }
-        }
-
-        this.last_rows = rows;
-    };
-
-
-    /**
-    * Sets the current position of the player
-    *
-    * @param {Number} col
-    * @param {Number} row
-    * @param {Boolean} no_player
-    * @method set_player
-    * @return {object}
-    */
-    fn.set_player = function(col, row, no_player) {
-        var self = this;
-        if (!no_player) {
-            this.empty_cells_player_occupies();
-        }
-        var cell = !no_player ? self.colliders_data[0].el.data : {col: col};
-        var to_col = cell.col;
-        var to_row = row || cell.row;
-
-        this.player_grid_data = {
-            col: to_col,
-            row: to_row,
-            size_y : this.player_grid_data.size_y,
-            size_x : this.player_grid_data.size_x
-        };
-
-        this.cells_occupied_by_player = this.get_cells_occupied(
-            this.player_grid_data);
-
-        var $overlapped_widgets = this.get_widgets_overlapped(
-            this.player_grid_data);
-
-        var constraints = this.widgets_constraints($overlapped_widgets);
-
-        this.manage_movements(constraints.can_go_up, to_col, to_row);
-        this.manage_movements(constraints.can_not_go_up, to_col, to_row);
-
-        /* if there is not widgets overlapping in the new player position,
-         * update the new placeholder position. */
-        if (!$overlapped_widgets.length) {
-            var pp = this.can_go_player_up(this.player_grid_data);
-            if (pp !== false) {
-                to_row = pp;
-            }
-            this.set_placeholder(to_col, to_row);
-        }
-
-        return {
-            col: to_col,
-            row: to_row
-        };
-    };
-
-
-    /**
-    * See which of the widgets in the $widgets param collection can go to
-    * a upper row and which not.
-    *
-    * @method widgets_contraints
-    * @param {jQuery} $widgets A jQuery wrapped collection of
-    * HTMLElements.
-    * @return {object} Returns a literal Object with two keys: `can_go_up` &
-    * `can_not_go_up`. Each contains a set of HTMLElements.
-    */
-    fn.widgets_constraints = function($widgets) {
-        var $widgets_can_go_up = $([]);
-        var $widgets_can_not_go_up;
-        var wgd_can_go_up = [];
-        var wgd_can_not_go_up = [];
-
-        $widgets.each($.proxy(function(i, w) {
-            var $w = $(w);
-            var wgd = $w.coords().grid;
-            if (this.can_go_widget_up(wgd)) {
-                $widgets_can_go_up = $widgets_can_go_up.add($w);
-                wgd_can_go_up.push(wgd);
-            } else {
-                wgd_can_not_go_up.push(wgd);
-            }
-        }, this));
-
-        $widgets_can_not_go_up = $widgets.not($widgets_can_go_up);
-
-        return {
-            can_go_up: Gridster.sort_by_row_asc(wgd_can_go_up),
-            can_not_go_up: Gridster.sort_by_row_desc(wgd_can_not_go_up)
-        };
-    };
-
-
-    /**
-    * Sorts an Array of grid coords objects (representing the grid coords of
-    * each widget) in descending way.
-    *
-    * @method manage_movements
-    * @param {jQuery} $widgets A jQuery collection of HTMLElements
-    *  representing the widgets you want to move.
-    * @param {Number} to_col The column to which we want to move the widgets.
-    * @param {Number} to_row The row to which we want to move the widgets.
-    * @return {Class} Returns the instance of the Gridster Class.
-    */
-    fn.manage_movements = function($widgets, to_col, to_row) {
-        $.each($widgets, $.proxy(function(i, w) {
-            var wgd = w;
-            var $w = wgd.el;
-
-            var can_go_widget_up = this.can_go_widget_up(wgd);
-
-            if (can_go_widget_up) {
-                //target CAN go up
-                //so move widget up
-                this.move_widget_to($w, can_go_widget_up);
-                this.set_placeholder(to_col, can_go_widget_up + wgd.size_y);
-
-            } else {
-                //target can't go up
-                var can_go_player_up = this.can_go_player_up(
-                    this.player_grid_data);
-
-                if (!can_go_player_up) {
-                    // target can't go up
-                    // player cant't go up
-                    // so we need to move widget down to a position that dont
-                    // overlaps player
-                    var y = (to_row + this.player_grid_data.size_y) - wgd.row;
-
-                    this.move_widget_down($w, y);
-                    this.set_placeholder(to_col, to_row);
-                }
-            }
-        }, this));
-
-        return this;
-    };
-
-    /**
-    * Determines if there is a widget in the row and col given. Or if the
-    * HTMLElement passed as first argument is the player.
-    *
-    * @method is_player
-    * @param {Number|HTMLElement} col_or_el A jQuery wrapped collection of
-    * HTMLElements.
-    * @param {Number} [row] The column to which we want to move the widgets.
-    * @return {Boolean} Returns true or false.
-    */
-    fn.is_player = function(col_or_el, row) {
-        if (row && !this.gridmap[col_or_el]) { return false; }
-        var $w = row ? this.gridmap[col_or_el][row] : col_or_el;
-        return $w && ($w.is(this.$player) || $w.is(this.$helper));
-    };
-
-
-    /**
-    * Determines if the widget that is being dragged is currently over the row
-    * and col given.
-    *
-    * @method is_player_in
-    * @param {Number} col The column to check.
-    * @param {Number} row The row to check.
-    * @return {Boolean} Returns true or false.
-    */
-    fn.is_player_in = function(col, row) {
-        var c = this.cells_occupied_by_player || {};
-        return $.inArray(col, c.cols) >= 0 && $.inArray(row, c.rows) >= 0;
-    };
-
-
-    /**
-    * Determines if the placeholder is currently over the row and col given.
-    *
-    * @method is_placeholder_in
-    * @param {Number} col The column to check.
-    * @param {Number} row The row to check.
-    * @return {Boolean} Returns true or false.
-    */
-    fn.is_placeholder_in = function(col, row) {
-        var c = this.cells_occupied_by_placeholder || {};
-        return this.is_placeholder_in_col(col) && $.inArray(row, c.rows) >= 0;
-    };
-
-
-    /**
-    * Determines if the placeholder is currently over the column given.
-    *
-    * @method is_placeholder_in_col
-    * @param {Number} col The column to check.
-    * @return {Boolean} Returns true or false.
-    */
-    fn.is_placeholder_in_col = function(col) {
-        var c = this.cells_occupied_by_placeholder || [];
-        return $.inArray(col, c.cols) >= 0;
-    };
-
-
-    /**
-    * Determines if the cell represented by col and row params is empty.
-    *
-    * @method is_empty
-    * @param {Number} col The column to check.
-    * @param {Number} row The row to check.
-    * @return {Boolean} Returns true or false.
-    */
-    fn.is_empty = function(col, row) {
-        if (typeof this.gridmap[col] !== 'undefined') {
-			if(typeof this.gridmap[col][row] !== 'undefined' &&
-				 this.gridmap[col][row] === false
-			) {
-				return true;
-			}
-			return false;
-		}
-		return true;
-    };
-
-
-    /**
-    * Determines if the cell represented by col and row params is occupied.
-    *
-    * @method is_occupied
-    * @param {Number} col The column to check.
-    * @param {Number} row The row to check.
-    * @return {Boolean} Returns true or false.
-    */
-    fn.is_occupied = function(col, row) {
-        if (!this.gridmap[col]) {
-            return false;
-        }
-
-        if (this.gridmap[col][row]) {
-            return true;
-        }
-        return false;
-    };
-
-
-    /**
-    * Determines if there is a widget in the cell represented by col/row params.
-    *
-    * @method is_widget
-    * @param {Number} col The column to check.
-    * @param {Number} row The row to check.
-    * @return {Boolean|HTMLElement} Returns false if there is no widget,
-    * else returns the jQuery HTMLElement
-    */
-    fn.is_widget = function(col, row) {
-        var cell = this.gridmap[col];
-        if (!cell) {
-            return false;
-        }
-
-        cell = cell[row];
-
-        if (cell) {
-            return cell;
-        }
-
-        return false;
-    };
-
-
-    /**
-    * Determines if there is a widget in the cell represented by col/row
-    * params and if this is under the widget that is being dragged.
-    *
-    * @method is_widget_under_player
-    * @param {Number} col The column to check.
-    * @param {Number} row The row to check.
-    * @return {Boolean} Returns true or false.
-    */
-    fn.is_widget_under_player = function(col, row) {
-        if (this.is_widget(col, row)) {
-            return this.is_player_in(col, row);
-        }
-        return false;
-    };
-
-
-    /**
-    * Get widgets overlapping with the player or with the object passed
-    * representing the grid cells.
-    *
-    * @method get_widgets_under_player
-    * @return {

<TRUNCATED>

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