build/dragdrop/dragdrop.js

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/*
Copyright (c) 2007, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.4.0
*/
/**
 * The drag and drop utility provides a framework for building drag and drop
 * applications.  In addition to enabling drag and drop for specific elements,
 * the drag and drop elements are tracked by the manager class, and the
 * interactions between the various elements are tracked during the drag and
 * the implementing code is notified about these important moments.
 * @module dragdrop
 * @title Drag and Drop
 * @requires yahoo,dom,event
 * @namespace YAHOO.util
 */

// Only load the library once.  Rewriting the manager class would orphan 
// existing drag and drop instances.
if (!YAHOO.util.DragDropMgr) {

/**
 * DragDropMgr is a singleton that tracks the element interaction for 
 * all DragDrop items in the window.  Generally, you will not call 
 * this class directly, but it does have helper methods that could 
 * be useful in your DragDrop implementations.
 * @class DragDropMgr
 * @static
 */
YAHOO.util.DragDropMgr = function() {

    var Event = YAHOO.util.Event;

    return {

        /**
         * Two dimensional Array of registered DragDrop objects.  The first 
         * dimension is the DragDrop item group, the second the DragDrop 
         * object.
         * @property ids
         * @type {string: string}
         * @private
         * @static
         */
        ids: {},

        /**
         * Array of element ids defined as drag handles.  Used to determine 
         * if the element that generated the mousedown event is actually the 
         * handle and not the html element itself.
         * @property handleIds
         * @type {string: string}
         * @private
         * @static
         */
        handleIds: {},

        /**
         * the DragDrop object that is currently being dragged