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From ey...@apache.org
Subject [12/19] chukwa git commit: CHUKWA-746. Redesigned Chukwa dashboard. (Eric Yang)
Date Tue, 26 May 2015 00:12:47 GMT
http://git-wip-us.apache.org/repos/asf/chukwa/blob/dfe84a2c/src/main/web/hicc/home/js/jquery.gridster.js
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diff --git a/src/main/web/hicc/home/js/jquery.gridster.js b/src/main/web/hicc/home/js/jquery.gridster.js
new file mode 100755
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+++ b/src/main/web/hicc/home/js/jquery.gridster.js
@@ -0,0 +1,4051 @@
+/*! 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+'"/></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 {HTMLElement} R

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