    /**
     * @class Ext.resizer.Resizer
     * <p>Applies drag handles to an element or component to make it resizable. The
     * drag handles are inserted into the element (or component's element) and
     * positioned absolute.</p>
     *
     * <p>Textarea and img elements will be wrapped with an additional div because
     * these elements do not support child nodes. The original element can be accessed
     * through the originalTarget property.</p>
     *
     * <p>Here is the list of valid resize handles:</p>
     * <pre>
    Value   Description
    ------  -------------------
     'n'     north
     's'     south
     'e'     east
     'w'     west
     'nw'    northwest
     'sw'    southwest
     'se'    southeast
     'ne'    northeast
     'all'   all
    </pre>
     * {@img Ext.resizer.Resizer/Ext.resizer.Resizer.png Ext.resizer.Resizer component}
     * <p>Here's an example showing the creation of a typical Resizer:</p>
     * <pre><code>
        <div id="elToResize" style="width:200px; height:100px; background-color:#000000;"></div>

        Ext.create('Ext.resizer.Resizer', {
            el: 'elToResize',
            handles: 'all',
            minWidth: 200,
            minHeight: 100,
            maxWidth: 500,
            maxHeight: 400,
            pinned: true
        });
    </code></pre>
    */
    Ext.define('Ext.resizer.Resizer', {
        mixins: {
            observable: 'Ext.util.Observable'
        },
        uses: ['Ext.resizer.ResizeTracker', 'Ext.Component'],

        alternateClassName: 'Ext.Resizable',

        handleCls: Ext.baseCSSPrefix + 'resizable-handle',
        pinnedCls: Ext.baseCSSPrefix + 'resizable-pinned',
        overCls:   Ext.baseCSSPrefix + 'resizable-over',
        proxyCls:  Ext.baseCSSPrefix + 'resizable-proxy',
        wrapCls:   Ext.baseCSSPrefix + 'resizable-wrap',

        /**
         * @cfg {Boolean} dynamic
         * <p>Specify as true to update the {@link #target} (Element or {@link Ext.Component Component}) dynamically during dragging.
         * This is <code>true</code> by default, but the {@link Ext.Component Component} class passes <code>false</code> when it
         * is configured as {@link Ext.Component#resizable}.</p>
         * <p>If specified as <code>false</code>, a proxy element is displayed during the resize operation, and the {@link #target}
         * is updated on mouseup.</p>
         */
        dynamic: true,

        /**
         * @cfg {String} handles String consisting of the resize handles to display. Defaults to 's e se' for
         * Elements and fixed position Components. Defaults to 8 point resizing for floating Components (such as Windows).
         * Specify either <code>'all'</code> or any of <code>'n s e w ne nw se sw'</code>.
         */
        handles: 's e se',

        /**
         * @cfg {Number} height Optional. The height to set target to in pixels (defaults to null)
         */
        height : null,

        /**
         * @cfg {Number} width Optional. The width to set the target to in pixels (defaults to null)
         */
        width : null,

        /**
         * @cfg {Number} minHeight The minimum height for the element (defaults to 20)
         */
        minHeight : 20,

        /**
         * @cfg {Number} minWidth The minimum width for the element (defaults to 20)
         */
        minWidth : 20,

        /**
         * @cfg {Number} maxHeight The maximum height for the element (defaults to 10000)
         */
        maxHeight : 10000,

        /**
         * @cfg {Number} maxWidth The maximum width for the element (defaults to 10000)
         */
        maxWidth : 10000,

        /**
         * @cfg {Boolean} pinned True to ensure that the resize handles are always
         * visible, false indicates resizing by cursor changes only (defaults to false)
         */
        pinned: false,

        /**
         * @cfg {Boolean} preserveRatio True to preserve the original ratio between height
         * and width during resize (defaults to false)
         */
        preserveRatio: false,

        /**
         * @cfg {Boolean} transparent True for transparent handles. This is only applied at config time. (defaults to false)
         */
        transparent: false,

        /**
         * @cfg {Mixed} constrainTo Optional. An element, or a {@link Ext.util.Region} into which the resize operation
         * must be constrained.
         */

        possiblePositions: {
            n:  'north',
            s:  'south',
            e:  'east',
            w:  'west',
            se: 'southeast',
            sw: 'southwest',
            nw: 'northwest',
            ne: 'northeast'
        },

        /**
         * @cfg {Mixed} target The Element or Component to resize.
         */

        /**
         * Outer element for resizing behavior.
         * @type Ext.core.Element
         * @property el
         */

        constructor: function(config) {
            var me = this,
                target,
                tag,
                handles = me.handles,
                handleCls,
                possibles,
                len,
                i = 0,
                pos;

            this.addEvents(
                /**
                 * @event beforeresize
                 * Fired before resize is allowed. Return false to cancel resize.
                 * @param {Ext.resizer.Resizer} this
                 * @param {Number} width The start width
                 * @param {Number} height The start height
                 * @param {Ext.EventObject} e The mousedown event
                 */
                'beforeresize',
                /**
                 * @event resizedrag
                 * Fires during resizing. Return false to cancel resize.
                 * @param {Ext.resizer.Resizer} this
                 * @param {Number} width The new width
                 * @param {Number} height The new height
                 * @param {Ext.EventObject} e The mousedown event
                 */
                'resizedrag',
                /**
                 * @event resize
                 * Fired after a resize.
                 * @param {Ext.resizer.Resizer} this
                 * @param {Number} width The new width
                 * @param {Number} height The new height
                 * @param {Ext.EventObject} e The mouseup event
                 */
                'resize'
            );

            if (Ext.isString(config) || Ext.isElement(config) || config.dom) {
                target = config;
                config = arguments[1] || {};
                config.target = target;
            }
            // will apply config to this
            me.mixins.observable.constructor.call(me, config);

            // If target is a Component, ensure that we pull the element out.
            // Resizer must examine the underlying Element.
            target = me.target;
            if (target) {
                if (target.isComponent) {
                    me.el = target.getEl();
                    if (target.minWidth) {
                        me.minWidth = target.minWidth;
                    }
                    if (target.minHeight) {
                        me.minHeight = target.minHeight;
                    }
                    if (target.maxWidth) {
                        me.maxWidth = target.maxWidth;
                    }
                    if (target.maxHeight) {
                        me.maxHeight = target.maxHeight;
                    }
                    if (target.floating) {
                        if (!this.hasOwnProperty('handles')) {
                            this.handles = 'n ne e se s sw w nw';
                        }
                    }
                } else {
                    me.el = me.target = Ext.get(target);
                }
            }
            // Backwards compatibility with Ext3.x's Resizable which used el as a config.
            else {
                me.target = me.el = Ext.get(me.el);
            }

            // Tags like textarea and img cannot
            // have children and therefore must
            // be wrapped
            tag = me.el.dom.tagName;
            if (tag == 'TEXTAREA' || tag == 'IMG') {
                /**
                 * Reference to the original resize target if the element of the original
                 * resize target was an IMG or a TEXTAREA which must be wrapped in a DIV.
                 * @type Mixed
                 * @property originalTarget
                 */
                me.originalTarget = me.target;
                me.target = me.el = me.el.wrap({
                    cls: me.wrapCls,
                    id: me.el.id + '-rzwrap'
                });

                // Transfer originalTarget's positioning/sizing
                me.el.setPositioning(me.originalTarget.getPositioning());
                me.originalTarget.clearPositioning();
                var box = me.originalTarget.getBox();
                me.el.setBox(box);
            }

            // Position the element, this enables us to absolute position
            // the handles within this.el
            me.el.position();
            if (me.pinned) {
                me.el.addCls(me.pinnedCls);
            }

            /**
             * @type Ext.resizer.ResizeTracker
             * @property resizeTracker
             */
            me.resizeTracker = Ext.create('Ext.resizer.ResizeTracker', {
                disabled: me.disabled,
                target: me.target,
                constrainTo: me.constrainTo,
                overCls: me.overCls,
                throttle: me.throttle,
                originalTarget: me.originalTarget,
                delegate: '.' + me.handleCls,
                dynamic: me.dynamic,
                preserveRatio: me.preserveRatio,
                minHeight: me.minHeight,
                maxHeight: me.maxHeight,
                minWidth: me.minWidth,
                maxWidth: me.maxWidth
            });

            // Relay the ResizeTracker's superclass events as our own resize events
            me.resizeTracker.on('mousedown', me.onBeforeResize, me);
            me.resizeTracker.on('drag', me.onResize, me);
            me.resizeTracker.on('dragend', me.onResizeEnd, me);

            if (me.handles == 'all') {
                me.handles = 'n s e w ne nw se sw';
            }

            handles = me.handles = me.handles.split(/ |\s*?[,;]\s*?/);
            possibles = me.possiblePositions;
            len = handles.length;
            handleCls = me.handleCls + ' ' + (this.target.isComponent ? (me.target.baseCls + '-handle ') : '') + me.handleCls + '-';

            for(; i < len; i++){
                // if specified and possible, create
                if (handles[i] && possibles[handles[i]]) {
                    pos = possibles[handles[i]];
                    // store a reference in this.east, this.west, etc

                    me[pos] = Ext.create('Ext.Component', {
                        owner: this,
                        region: pos,
                        cls: handleCls + pos,
                        renderTo: me.el
                    });
                    me[pos].el.unselectable();
                    if (me.transparent) {
                        me[pos].el.setOpacity(0);
                    }
                }
            }

            // Constrain within configured maxima
            if (Ext.isNumber(me.width)) {
                me.width = Ext.Number.constrain(me.width, me.minWidth, me.maxWidth);
            }
            if (Ext.isNumber(me.height)) {
                me.height = Ext.Number.constrain(me.height, me.minHeight, me.maxHeight);
            }

            // Size the element
            if (me.width != null || me.height != null) {
                if (me.originalTarget) {
                    me.originalTarget.setWidth(me.width);
                    me.originalTarget.setHeight(me.height);
                }
                me.resizeTo(me.width, me.height);
            }

            me.forceHandlesHeight();
        },

        disable: function() {
            this.resizeTracker.disable();
        },

        enable: function() {
            this.resizeTracker.enable();
        },

        /**
         * @private Relay the Tracker's mousedown event as beforeresize
         * @param tracker The Resizer
         * @param e The Event
         */
        onBeforeResize: function(tracker, e) {
            var b = this.target.getBox();
            return this.fireEvent('beforeresize', this, b.width, b.height, e);
        },

        /**
         * @private Relay the Tracker's drag event as resizedrag
         * @param tracker The Resizer
         * @param e The Event
         */
        onResize: function(tracker, e) {
            var me = this,
                b = me.target.getBox();
            me.forceHandlesHeight();
            return me.fireEvent('resizedrag', me, b.width, b.height, e);
        },

        /**
         * @private Relay the Tracker's dragend event as resize
         * @param tracker The Resizer
         * @param e The Event
         */
        onResizeEnd: function(tracker, e) {
            var me = this,
                b = me.target.getBox();
            me.forceHandlesHeight();
            return me.fireEvent('resize', me, b.width, b.height, e);
        },

        /**
         * Perform a manual resize and fires the 'resize' event.
         * @param {Number} width
         * @param {Number} height
         */
        resizeTo : function(width, height){
            this.target.setSize(width, height);
            this.fireEvent('resize', this, width, height, null);
        },

        /**
         * <p>Returns the element that was configured with the el or target config property.
         * If a component was configured with the target property then this will return the
         * element of this component.<p>
         * <p>Textarea and img elements will be wrapped with an additional div because
          * these elements do not support child nodes. The original element can be accessed
         * through the originalTarget property.</p>
         * @return {Element} element
         */
        getEl : function() {
            return this.el;
        },

        /**
         * <p>Returns the element or component that was configured with the target config property.<p>
         * <p>Textarea and img elements will be wrapped with an additional div because
          * these elements do not support child nodes. The original element can be accessed
         * through the originalTarget property.</p>
         * @return {Element/Component}
         */
        getTarget: function() {
            return this.target;
        },

        destroy: function() {
            var h;
            for (var i = 0, l = this.handles.length; i < l; i++) {
                h = this[this.possiblePositions[this.handles[i]]];
                delete h.owner;
                Ext.destroy(h);
            }
        },

        /**
         * @private
         * Fix IE6 handle height issue.
         */
        forceHandlesHeight : function() {
            var me = this,
                handle;
            if (Ext.isIE6) {
                handle = me.east;
                if (handle) {
                    handle.setHeight(me.el.getHeight());
                }
                handle = me.west;
                if (handle) {
                    handle.setHeight(me.el.getHeight());
                }
                me.el.repaint();
            }
        }
    });