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

    /**

     * Provides the ability to drag a Node.

     * @module dd

     * @submodule dd-drag

     */

    /**

     * Provides the ability to drag a Node.

     * @class Drag

     * @extends Base

     * @constructor

     * @namespace DD

     */

    var DDM = Y.DD.DDM,

        NODE = 'node',

        DRAGGING = 'dragging',

        DRAG_NODE = 'dragNode',

        OFFSET_HEIGHT = 'offsetHeight',

        OFFSET_WIDTH = 'offsetWidth',

        /**

        * Handles the mouseup DOM event, does nothing internally just fires.

        * @event drag:mouseup

        * @bubbles DDM

        * @type {CustomEvent}

        */

        /**

        * Handles the mousedown DOM event, checks to see if you have a valid handle then starts the drag timers.

        * @event drag:mouseDown

        * @preventable _defMouseDownFn

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl><dt>ev</dt><dd>The original mousedown event.</dd></dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_MOUSE_DOWN = 'drag:mouseDown',

        /**

        * Fires after the mousedown event has been cleared.

        * @event drag:afterMouseDown

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl><dt>ev</dt><dd>The original mousedown event.</dd></dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_AFTER_MOUSE_DOWN = 'drag:afterMouseDown',

        /**

        * Fires after a handle is removed.

        * @event drag:removeHandle

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl><dt>handle</dt><dd>The handle that was removed.</dd></dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_REMOVE_HANDLE = 'drag:removeHandle',

        /**

        * Fires after a handle is added.

        * @event drag:addHandle

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl><dt>handle</dt><dd>The handle that was added.</dd></dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_ADD_HANDLE = 'drag:addHandle',

        /**

        * Fires after an invalid selector is removed.

        * @event drag:removeInvalid

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl><dt>handle</dt><dd>The handle that was removed.</dd></dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_REMOVE_INVALID = 'drag:removeInvalid',

        /**

        * Fires after an invalid selector is added.

        * @event drag:addInvalid

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl><dt>handle</dt><dd>The handle that was added.</dd></dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_ADD_INVALID = 'drag:addInvalid',

        /**

        * Fires at the start of a drag operation.

        * @event drag:start

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>pageX</dt><dd>The original node position X.</dd>

        * <dt>pageY</dt><dd>The original node position Y.</dd>

        * <dt>startTime</dt><dd>The startTime of the event. getTime on the current Date object.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_START = 'drag:start',

        /**

        * Fires at the end of a drag operation.

        * @event drag:end

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>pageX</dt><dd>The current node position X.</dd>

        * <dt>pageY</dt><dd>The current node position Y.</dd>

        * <dt>startTime</dt><dd>The startTime of the event, from the start event.</dd>

        * <dt>endTime</dt><dd>The endTime of the event. getTime on the current Date object.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_END = 'drag:end',

        /**

        * Fires every mousemove during a drag operation.

        * @event drag:drag

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>pageX</dt><dd>The current node position X.</dd>

        * <dt>pageY</dt><dd>The current node position Y.</dd>

        * <dt>scroll</dt><dd>Should a scroll action occur.</dd>

        * <dt>info</dt><dd>Object hash containing calculated XY arrays: start, xy, delta, offset</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_DRAG = 'drag:drag',

        /**

        * Fires when this node is aligned.

        * @event drag:align

        * @preventable _defAlignFn

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>pageX</dt><dd>The current node position X.</dd>

        * <dt>pageY</dt><dd>The current node position Y.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        EV_ALIGN = 'drag:align',

        /**

        * Fires when this node is over a Drop Target. (Fired from dd-drop)

        * @event drag:over

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>drop</dt><dd>The drop object at the time of the event.</dd>

        * <dt>drag</dt><dd>The drag object at the time of the event.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        /**

        * Fires when this node enters a Drop Target. (Fired from dd-drop)

        * @event drag:enter

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>drop</dt><dd>The drop object at the time of the event.</dd>

        * <dt>drag</dt><dd>The drag object at the time of the event.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        /**

        * Fires when this node exits a Drop Target. (Fired from dd-drop)

        * @event drag:exit

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>drop</dt><dd>The drop object at the time of the event.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        /**

        * Fires when this node is dropped on a valid Drop Target. (Fired from dd-ddm-drop)

        * @event drag:drophit

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>drop</dt><dd>The best guess on what was dropped on.</dd>

        * <dt>drag</dt><dd>The drag object at the time of the event.</dd>

        * <dt>others</dt><dd>An array of all the other drop targets that was dropped on.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

        /**

        * Fires when this node is dropped on an invalid Drop Target. (Fired from dd-ddm-drop)

        * @event drag:dropmiss

        * @param {EventFacade} event An Event Facade object with the following specific property added:

        * <dl>

        * <dt>pageX</dt><dd>The current node position X.</dd>

        * <dt>pageY</dt><dd>The current node position Y.</dd>

        * </dl>

        * @bubbles DDM

        * @type {CustomEvent}

        */

    Drag = function(o) {

        this._lazyAddAttrs = false;

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

        var valid = DDM._regDrag(this);

        if (!valid) {

            Y.error('Failed to register node, already in use: ' + o.node);

        }

    };

    Drag.NAME = 'drag';

    /**

    * This property defaults to "mousedown", but when drag-gestures is loaded, it is changed to "gesturemovestart"

    * @static

    * @property START_EVENT

    */

    Drag.START_EVENT = 'mousedown';

    Drag.ATTRS = {

        /**

        * Y.Node instance to use as the element to initiate a drag operation

        * @attribute node

        * @type Node

        */

        node: {

            setter: function(node) {

                if (this._canDrag(node)) {

                    return node;

                }

                var n = Y.one(node);

                if (!n) {

                    Y.error('DD.Drag: Invalid Node Given: ' + node);

                }

                return n;

            }

        },

        /**

        * Y.Node instance to use as the draggable element, defaults to node

        * @attribute dragNode

        * @type Node

        */

        dragNode: {

            setter: function(node) {

                if (this._canDrag(node)) {

                    return node;

                }

                var n = Y.one(node);

                if (!n) {

                    Y.error('DD.Drag: Invalid dragNode Given: ' + node);

                }

                return n;

            }

        },

        /**

        * Offset the drag element by the difference in cursor position: default true

        * @attribute offsetNode

        * @type Boolean

        */

        offsetNode: {

            value: true

        },

        /**

        * Center the dragNode to the mouse position on drag:start: default false

        * @attribute startCentered

        * @type Boolean

        */

        startCentered: {

            value: false

        },

        /**

        * The number of pixels to move to start a drag operation, default is 3.

        * @attribute clickPixelThresh

        * @type Number

        */

        clickPixelThresh: {

            value: DDM.get('clickPixelThresh')

        },

        /**

        * The number of milliseconds a mousedown has to pass to start a drag operation, default is 1000.

        * @attribute clickTimeThresh

        * @type Number

        */

        clickTimeThresh: {

            value: DDM.get('clickTimeThresh')

        },

        /**

        * Set to lock this drag element so that it can't be dragged: default false.

        * @attribute lock

        * @type Boolean

        */

        lock: {

            value: false,

            setter: function(lock) {

                if (lock) {

                    this.get(NODE).addClass(DDM.CSS_PREFIX + '-locked');

                } else {

                    this.get(NODE).removeClass(DDM.CSS_PREFIX + '-locked');

                }

                return lock;

            }

        },

        /**

        * A payload holder to store arbitrary data about this drag object, can be used to store any value.

        * @attribute data

        * @type Mixed

        */

        data: {

            value: false

        },

        /**

        * If this is false, the drag element will not move with the cursor: default true. Can be used to "resize" the element.

        * @attribute move

        * @type Boolean

        */

        move: {

            value: true

        },

        /**

        * Use the protective shim on all drag operations: default true. Only works with dd-ddm, not dd-ddm-base.

        * @attribute useShim

        * @type Boolean

        */

        useShim: {

            value: true

        },

        /**

        * Config option is set by Drag to inform you of which handle fired the drag event (in the case that there are several handles): default false.

        * @attribute activeHandle

        * @type Node

        */

        activeHandle: {

            value: false

        },

        /**

        * By default a drag operation will only begin if the mousedown occurred with the primary mouse button.

        * Setting this to false will allow for all mousedown events to trigger a drag.

        * @attribute primaryButtonOnly

        * @type Boolean

        */

        primaryButtonOnly: {

            value: true

        },

        /**

        * This attribute is not meant to be used by the implementor, it is meant to be used as an Event tracker so you can listen for it to change.

        * @attribute dragging

        * @type Boolean

        */

        dragging: {

            value: false

        },

        parent: {

            value: false

        },

        /**

        * This attribute only works if the dd-drop module has been loaded. It will make this node a drop target as well as draggable.

        * @attribute target

        * @type Boolean

        */

        target: {

            value: false,

            setter: function(config) {

                this._handleTarget(config);

                return config;

            }

        },

        /**

        * This attribute only works if the dd-drop module is active. It will set the dragMode (point, intersect, strict) of this Drag instance.

        * @attribute dragMode

        * @type String

        */

        dragMode: {

            value: null,

            setter: function(mode) {

                return DDM._setDragMode(mode);

            }

        },

        /**

        * Array of groups to add this drag into.

        * @attribute groups

        * @type Array

        */

        groups: {

            value: ['default'],

            getter: function() {

                if (!this._groups) {

                    this._groups = {};

                    return [];

                }

                return Y.Object.keys(this._groups);

            },

            setter: function(g) {

                this._groups = Y.Array.hash(g);

                return g;

            }

        },

        /**

        * Array of valid handles to add. Adding something here will set all handles, even if previously added with addHandle

        * @attribute handles

        * @type Array

        */

        handles: {

            value: null,

            setter: function(g) {

                if (g) {

                    this._handles = {};

                    Y.Array.each(g, function(v) {

                        var key = v;

                        if (v instanceof Y.Node || v instanceof Y.NodeList) {

                            key = v._yuid;

                        }

                        this._handles[key] = v;

                    }, this);

                } else {

                    this._handles = null;

                }

                return g;

            }

        },

        /**

        * Controls the default bubble parent for this Drag instance. Default: Y.DD.DDM. Set to false to disable bubbling. Use bubbleTargets in config

        * @deprecated

        * @attribute bubbles

        * @type Object

        */

        bubbles: {

            setter: function(t) {

                Y.log('bubbles is deprecated use bubbleTargets: HOST', 'warn', 'dd');

                this.addTarget(t);

                return t;

            }

        },

        /**

        * Should the mousedown event be halted. Default: true

        * @attribute haltDown

        * @type Boolean

        */

        haltDown: {

            value: true

        }

    };

    Y.extend(Drag, Y.Base, {

        /**

        * Checks the object for the methods needed to drag the object around.

        * Normally this would be a node instance, but in the case of Graphics, it

        * may be an SVG node or something similar.

        * @method _canDrag

        * @private

        * @param {Object} n The object to check

        * @return {Boolean} True or false if the Object contains the methods needed to Drag

        */

        _canDrag: function(n) {

            if (n && n.setXY && n.getXY && n.test && n.contains) {

                return true;

            }

            return false;

        },

        /**

        * The default bubbleTarget for this object. Default: Y.DD.DDM

        * @private

        * @property _bubbleTargets

        */

        _bubbleTargets: Y.DD.DDM,

        /**

        * Add this Drag instance to a group, this should be used for on-the-fly group additions.

        * @method addToGroup

        * @param {String} g The group to add this Drag Instance to.

        * @chainable

        */

        addToGroup: function(g) {

            this._groups[g] = true;

            DDM._activateTargets();

            return this;

        },

        /**

        * Remove this Drag instance from a group, this should be used for on-the-fly group removals.

        * @method removeFromGroup

        * @param {String} g The group to remove this Drag Instance from.

        * @chainable

        */

        removeFromGroup: function(g) {

            delete this._groups[g];

            DDM._activateTargets();

            return this;

        },

        /**

        * This will be a reference to the Drop instance associated with this drag if the target: true config attribute is set..

        * @property target

        * @type {Object}

        */

        target: null,

        /**

        * Attribute handler for the target config attribute.

        * @private

        * @method _handleTarget

        * @param {Boolean/Object} config The Config

        */

        _handleTarget: function(config) {

            if (Y.DD.Drop) {

                if (config === false) {

                    if (this.target) {

                        DDM._unregTarget(this.target);

                        this.target = null;

                    }

                } else {

                    if (!Y.Lang.isObject(config)) {

                        config = {};

                    }

                    config.bubbleTargets = config.bubbleTargets || this.getTargets();

                    config.node = this.get(NODE);

                    config.groups = config.groups || this.get('groups');

                    this.target = new Y.DD.Drop(config);

                }

            }

        },

        /**

        * Storage Array for the groups this drag belongs to.

        * @private

        * @property _groups

        * @type {Array}

        */

        _groups: null,

        /**

        * This method creates all the events for this Event Target and publishes them so we get Event Bubbling.

        * @private

        * @method _createEvents

        */

        _createEvents: function() {

            this.publish(EV_MOUSE_DOWN, {

                defaultFn: this._defMouseDownFn,

                queuable: false,

                emitFacade: true,

                bubbles: true,

                prefix: 'drag'

            });

            this.publish(EV_ALIGN, {

                defaultFn: this._defAlignFn,

                queuable: false,

                emitFacade: true,

                bubbles: true,

                prefix: 'drag'

            });

            this.publish(EV_DRAG, {

                defaultFn: this._defDragFn,

                queuable: false,

                emitFacade: true,

                bubbles: true,

                prefix: 'drag'

            });

            this.publish(EV_END, {

                defaultFn: this._defEndFn,

                preventedFn: this._prevEndFn,

                queuable: false,

                emitFacade: true,

                bubbles: true,

                prefix: 'drag'

            });

            var ev = [

                EV_AFTER_MOUSE_DOWN,

                EV_REMOVE_HANDLE,

                EV_ADD_HANDLE,

                EV_REMOVE_INVALID,

                EV_ADD_INVALID,

                EV_START,

                'drag:drophit',

                'drag:dropmiss',

                'drag:over',

                'drag:enter',

                'drag:exit'

            ];

            Y.Array.each(ev, function(v) {

                this.publish(v, {

                    type: v,

                    emitFacade: true,

                    bubbles: true,

                    preventable: false,

                    queuable: false,

                    prefix: 'drag'

                });

            }, this);

        },

        /**

        * A private reference to the mousedown DOM event

        * @private

        * @property _ev_md

        * @type {EventFacade}

        */

        _ev_md: null,

        /**

        * The getTime of the mousedown event. Not used, just here in case someone wants/needs to use it.

        * @private

        * @property _startTime

        * @type Date

        */

        _startTime: null,

        /**

        * The getTime of the mouseup event. Not used, just here in case someone wants/needs to use it.

        * @private

        * @property _endTime

        * @type Date

        */

        _endTime: null,

        /**

        * A private hash of the valid drag handles

        * @private

        * @property _handles

        * @type {Object}

        */

        _handles: null,

        /**

        * A private hash of the invalid selector strings

        * @private

        * @property _invalids

        * @type {Object}

        */

        _invalids: null,

        /**

        * A private hash of the default invalid selector strings: {'textarea': true, 'input': true, 'a': true, 'button': true, 'select': true}

        * @private

        * @property _invalidsDefault

        * @type {Object}

        */

        _invalidsDefault: {'textarea': true, 'input': true, 'a': true, 'button': true, 'select': true },

        /**

        * Private flag to see if the drag threshhold was met

        * @private

        * @property _dragThreshMet

        * @type {Boolean}

        */

        _dragThreshMet: null,

        /**

        * Flag to determine if the drag operation came from a timeout

        * @private

        * @property _fromTimeout

        * @type {Boolean}

        */

        _fromTimeout: null,

        /**

        * Holder for the setTimeout call

        * @private

        * @property _clickTimeout

        * @type {Boolean}

        */

        _clickTimeout: null,

        /**

        * The offset of the mouse position to the element's position

        * @property deltaXY

        * @type {Array}

        */

        deltaXY: null,

        /**

        * The initial mouse position

        * @property startXY

        * @type {Array}

        */

        startXY: null,

        /**

        * The initial element position

        * @property nodeXY

        * @type {Array}

        */

        nodeXY: null,

        /**

        * The position of the element as it's moving (for offset calculations)

        * @property lastXY

        * @type {Array}

        */

        lastXY: null,

        /**

        * The xy that the node will be set to. Changing this will alter the position as it's dragged.

        * @property actXY

        * @type {Array}

        */

        actXY: null,

        /**

        * The real xy position of the node.

        * @property realXY

        * @type {Array}

        */

        realXY: null,

        /**

        * The XY coords of the mousemove

        * @property mouseXY

        * @type {Array}

        */

        mouseXY: null,

        /**

        * A region object associated with this drag, used for checking regions while dragging.

        * @property region

        * @type Object

        */

        region: null,

        /**

        * Handler for the mouseup DOM event

        * @private

        * @method _handleMouseUp

        * @param {EventFacade} ev The Event

        */

        _handleMouseUp: function() {

            this.fire('drag:mouseup');

            this._fixIEMouseUp();

            if (DDM.activeDrag) {

                DDM._end();

            }

        },

        /**

        * The function we use as the ondragstart handler when we start a drag

        * in Internet Explorer. This keeps IE from blowing up on images as drag handles.

        * @private

        * @method _fixDragStart

        * @param {Event} e The Event

        */

        _fixDragStart: function(e) {

            if (this.validClick(e)) {

                e.preventDefault();

            }

        },

        /**

        * The function we use as the onselectstart handler when we start a drag in Internet Explorer

        * @private

        * @method _ieSelectFix

        */

        _ieSelectFix: function() {

            return false;

        },

        /**

        * We will hold a copy of the current "onselectstart" method on this property, and reset it after we are done using it.

        * @private

        * @property _ieSelectBack

        */

        _ieSelectBack: null,

        /**

        * This method copies the onselectstart listner on the document to the _ieSelectFix property

        * @private

        * @method _fixIEMouseDown

        */

        _fixIEMouseDown: function() {

            if (Y.UA.ie) {

                this._ieSelectBack = Y.config.doc.body.onselectstart;

                Y.config.doc.body.onselectstart = this._ieSelectFix;

            }

        },

        /**

        * This method copies the _ieSelectFix property back to the onselectstart listner on the document.

        * @private

        * @method _fixIEMouseUp

        */

        _fixIEMouseUp: function() {

            if (Y.UA.ie) {

                Y.config.doc.body.onselectstart = this._ieSelectBack;

            }

        },

        /**

        * Handler for the mousedown DOM event

        * @private

        * @method _handleMouseDownEvent

        * @param {EventFacade} ev  The Event

        */

        _handleMouseDownEvent: function(ev) {

            if (this.validClick(ev)) {

                ev.preventDefault();

            }

            this.fire(EV_MOUSE_DOWN, { ev: ev });

        },

        /**

        * Handler for the mousedown DOM event

        * @private

        * @method _defMouseDownFn

        * @param {EventFacade} e  The Event

        */

        _defMouseDownFn: function(e) {

            var ev = e.ev;

            this._dragThreshMet = false;

            this._ev_md = ev;

            if (this.get('primaryButtonOnly') && ev.button > 1) {

                return false;

            }

            if (this.validClick(ev)) {

                this._fixIEMouseDown(ev);

                if (Drag.START_EVENT.indexOf('gesture') !== 0) {

                    //Only do these if it's not a gesture

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

                        Y.log('Halting MouseDown', 'info', 'drag');

                        ev.halt();

                    } else {

                        Y.log('Preventing Default on MouseDown', 'info', 'drag');

                        ev.preventDefault();

                    }

                }

                this._setStartPosition([ev.pageX, ev.pageY]);

                DDM.activeDrag = this;

                this._clickTimeout = Y.later(this.get('clickTimeThresh'), this, this._timeoutCheck);

            }

            this.fire(EV_AFTER_MOUSE_DOWN, { ev: ev });

        },

        /**

        * Method first checks to see if we have handles, if so it validates the click

        * against the handle. Then if it finds a valid handle, it checks it against

        * the invalid handles list. Returns true if a good handle was used, false otherwise.

        * @method validClick

        * @param {EventFacade} ev  The Event

        * @return {Boolean}

        */

        validClick: function(ev) {

            var r = false, n = false,

            tar = ev.target,

            hTest = null,

            els = null,

            nlist = null,

            set = false;

            if (this._handles) {

                Y.Object.each(this._handles, function(i, n) {

                    if (i instanceof Y.Node || i instanceof Y.NodeList) {

                        if (!r) {

                            nlist = i;

                            if (nlist instanceof Y.Node) {

                                nlist = new Y.NodeList(i._node);

                            }

                            nlist.each(function(nl) {

                                if (nl.contains(tar)) {

                                    r = true;

                                }

                            });

                        }

                    } else if (Y.Lang.isString(n)) {

                        //Am I this or am I inside this

                        if (tar.test(n + ', ' + n + ' *') && !hTest) {

                            hTest = n;

                            r = true;

                        }

                    }

                });

            } else {

                n = this.get(NODE);

                if (n.contains(tar) || n.compareTo(tar)) {

                    r = true;

                }

            }

            if (r) {

                if (this._invalids) {

                    Y.Object.each(this._invalids, function(i, n) {

                        if (Y.Lang.isString(n)) {

                            //Am I this or am I inside this

                            if (tar.test(n + ', ' + n + ' *')) {

                                r = false;

                            }

                        }

                    });

                }

            }

            if (r) {

                if (hTest) {

                    els = ev.currentTarget.all(hTest);

                    set = false;

                    els.each(function(n) {

                        if ((n.contains(tar) || n.compareTo(tar)) && !set) {

                            set = true;

                            this.set('activeHandle', n);

                        }

                    }, this);

                } else {

                    this.set('activeHandle', this.get(NODE));

                }

            }

            return r;

        },

        /**

        * Sets the current position of the Element and calculates the offset

        * @private

        * @method _setStartPosition

        * @param {Array} xy The XY coords to set the position to.

        */

        _setStartPosition: function(xy) {

            this.startXY = xy;

            this.nodeXY = this.lastXY = this.realXY = this.get(NODE).getXY();

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

                this.deltaXY = [(this.startXY[0] - this.nodeXY[0]), (this.startXY[1] - this.nodeXY[1])];

            } else {

                this.deltaXY = [0, 0];

            }

        },

        /**

        * The method passed to setTimeout to determine if the clickTimeThreshold was met.

        * @private

        * @method _timeoutCheck

        */

        _timeoutCheck: function() {

            if (!this.get('lock') && !this._dragThreshMet && this._ev_md) {

                this._fromTimeout = this._dragThreshMet = true;

                this.start();

                this._alignNode([this._ev_md.pageX, this._ev_md.pageY], true);

            }

        },

        /**

        * Remove a Selector added by addHandle

        * @method removeHandle

        * @param {String} str The selector for the handle to be removed.

        * @chainable

        */

        removeHandle: function(str) {

            var key = str;

            if (str instanceof Y.Node || str instanceof Y.NodeList) {

                key = str._yuid;

            }

            if (this._handles[key]) {

                delete this._handles[key];

                this.fire(EV_REMOVE_HANDLE, { handle: str });

            }

            return this;

        },

        /**

        * Add a handle to a drag element. Drag only initiates when a mousedown happens on this element.

        * @method addHandle

        * @param {String} str The selector to test for a valid handle. Must be a child of the element.

        * @chainable

        */

        addHandle: function(str) {

            if (!this._handles) {

                this._handles = {};

            }

            var key = str;

            if (str instanceof Y.Node || str instanceof Y.NodeList) {

                key = str._yuid;

            }

            this._handles[key] = str;

            this.fire(EV_ADD_HANDLE, { handle: str });

            return this;

        },

        /**

        * Remove an invalid handle added by addInvalid

        * @method removeInvalid

        * @param {String} str The invalid handle to remove from the internal list.

        * @chainable

        */

        removeInvalid: function(str) {

            if (this._invalids[str]) {

                this._invalids[str] = null;

                delete this._invalids[str];

                this.fire(EV_REMOVE_INVALID, { handle: str });

            }

            return this;

        },

        /**

        * Add a selector string to test the handle against. If the test passes the drag operation will not continue.

        * @method addInvalid

        * @param {String} str The selector to test against to determine if this is an invalid drag handle.

        * @chainable

        */

        addInvalid: function(str) {

            if (Y.Lang.isString(str)) {

                this._invalids[str] = true;

                this.fire(EV_ADD_INVALID, { handle: str });

            }

            return this;

        },

        /**

        * Internal init handler

        * @private

        * @method initializer

        */

        initializer: function() {

            this.get(NODE).dd = this;

            if (!this.get(NODE).get('id')) {

                var id = Y.stamp(this.get(NODE));

                this.get(NODE).set('id', id);

            }

            this.actXY = [];

            this._invalids = Y.clone(this._invalidsDefault, true);

            this._createEvents();

            if (!this.get(DRAG_NODE)) {

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

            }

            //Fix for #2528096

            //Don't prep the DD instance until all plugins are loaded.

            this.on('initializedChange', Y.bind(this._prep, this));