/*

Copyright (c) 2009, Yahoo! Inc. All rights reserved.

Code licensed under the BSD License:

http://developer.yahoo.net/yui/license.txt

version: 3.0.0b1

build: 1163

*/

YUI.add('dd-proxy', function(Y) {

    /**

     * The Drag & Drop Utility allows you to create a draggable interface efficiently, buffering you from browser-level abnormalities and enabling you to focus on the interesting logic surrounding your particular implementation. This component enables you to create a variety of standard draggable objects with just a few lines of code and then, using its extensive API, add your own specific implementation logic.

     * @module dd

     * @submodule dd-proxy

     */

    /**

     * This plugin for dd-drag is for creating a proxy drag node, instead of dragging the original node.

     * @class DDProxy

     * @extends Base

     * @constructor

     * @namespace Plugin     

     */

    var DDM = Y.DD.DDM,

        NODE = 'node',

        DRAG_NODE = 'dragNode',

        HOST = 'host',

        TRUE = true;

    var P = function(config) {

        P.superclass.constructor.apply(this, arguments);

    };

    P.NAME = 'DDProxy';

    /**

    * @property proxy

    * @description The Proxy instance will be placed on the Drag instance under the proxy namespace.

    * @type {String}

    */

    P.NS = 'proxy';

    P.ATTRS = {

        host: {

        },

        /**

        * @attribute moveOnEnd

        * @description Move the original node at the end of the drag. Default: true

        * @type Boolean

        */

        moveOnEnd: {

            value: TRUE

        },

        /**

        * @attribute resizeFrame

        * @description Make the Proxy node assume the size of the original node. Default: true

        * @type Boolean

        */

        resizeFrame: {

            value: TRUE

        },

        /**

        * @attribute positionProxy

        * @description Make the Proxy node appear in the same place as the original node. Default: true

        * @type Boolean

        */

        positionProxy: {

            value: TRUE

        },

        /**

        * @attribute borderStyle

        * @description The default border style for the border of the proxy. Default: 1px solid #808080

        * @type Boolean

        */

        borderStyle: {

            value: '1px solid #808080'

        }

    };

    var proto = {

        /**

        * @private

        * @property _hands

        * @description Holds the event handles for setting the proxy

        */

        _hands: null,

        /**

        * @private

        * @method _init

        * @description Handler for the proxy config attribute

        */

        _init: function() {

            if (!DDM._proxy) {

                Y.on('domready', Y.bind(this._init, this));

                return;

            }

            if (!this._hands) {

                this._hands = [];

            }

            var i, h, h1, host = this.get(HOST), dnode = host.get(DRAG_NODE);

            if (dnode.compareTo(host.get(NODE))) {

                if (DDM._proxy) {

                    host.set(DRAG_NODE, DDM._proxy);

                }

            }

            for (i in this._hands) {

                this._hands[i].detach();

            }

            h = DDM.on('ddm:start', Y.bind(function() {

                if (DDM.activeDrag === host) {

                    DDM._setFrame(host);

                }

            }, this));

            h1 = DDM.on('ddm:end', Y.bind(function() {

                if (host.get('dragging')) {

                    if (this.get('moveOnEnd')) {

                        host.get(NODE).setXY(host.lastXY);

                    }

                    host.get(DRAG_NODE).setStyle('display', 'none');

                }

            }, this));

            this._hands = [h, h1];

        },

        initializer: function() {

            this._init();

        },

        destructor: function() {

            var host = this.get(HOST);

            for (var i in this._hands) {

                this._hands[i].detach();

            }

            host.set(DRAG_NODE, host.get(NODE));

        }

    };

    Y.namespace('Plugin');

    Y.extend(P, Y.Base, proto);

    Y.Plugin.DDProxy = P;

    //Add a couple of methods to the DDM

    Y.mix(DDM, {

        /**

        * @private

        * @for DDM

        * @namespace DD

        * @method _createFrame

        * @description Create the proxy element if it doesn't already exist and set the DD.DDM._proxy value

        */

        _createFrame: function() {

            if (!DDM._proxy) {

                DDM._proxy = TRUE;

                var p = Y.Node.create('<div></div>'),

                b = Y.Node.get('body');

                p.setStyles({

                    position: 'absolute',

                    display: 'none',

                    zIndex: '999',

                    top: '-999px',

                    left: '-999px'

                });

                b.insertBefore(p, b.get('firstChild'));

                p.set('id', Y.stamp(p));

                p.addClass(DDM.CSS_PREFIX + '-proxy');

                DDM._proxy = p;

            }

        },

        /**

        * @private

        * @for DDM

        * @namespace DD

        * @method _setFrame

        * @description If resizeProxy is set to true (default) it will resize the proxy element to match the size of the Drag Element.

        * If positionProxy is set to true (default) it will position the proxy element in the same location as the Drag Element.

        */

        _setFrame: function(drag) {

            var n = drag.get(NODE), d = drag.get(DRAG_NODE), ah, cur = 'auto';

            if (drag.proxy.get('resizeFrame')) {

                DDM._proxy.setStyles({

                    height: n.get('offsetHeight') + 'px',

                    width: n.get('offsetWidth') + 'px'

                });

            }

            ah = DDM.activeDrag.get('activeHandle');

            if (ah) {

                cur = ah.getStyle('cursor');

            }

            if (cur == 'auto') {

                cur = DDM.get('dragCursor');

            }

            d.setStyles({

                visibility: 'hidden',

                display: 'block',

                cursor: cur,

                border: drag.proxy.get('borderStyle')

            });

            if (drag.proxy.get('positionProxy')) {

                d.setXY(drag.nodeXY);

            }

            d.setStyle('visibility', 'visible');

        }

    });

    //Create the frame when DOM is ready

    Y.on('domready', Y.bind(DDM._createFrame, DDM));

}, '3.0.0b1' ,{requires:['dd-ddm', 'dd-drag'], skinnable:false});