The Tor Browser: dom/tests/mochitest/ajax/mochikit/MochiKit/DragAndDrop.js@a63d609f5ebe (annotated)

dom/tests/mochitest/ajax/mochikit/MochiKit/DragAndDrop.js@a63d609f5ebe (annotated)

dom/tests/mochitest/ajax/mochikit/MochiKit/DragAndDrop.js

Thu, 15 Jan 2015 15:55:04 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:55:04 +0100
branch: TOR_BUG_9701
changeset 9: a63d609f5ebe
permissions: -rw-r--r--

Back out 97036ab72558 which inappropriately compared turds to third parties.

 /***
 MochiKit.DragAndDrop 1.4
 See <http://mochikit.com/> for documentation, downloads, license, etc.
 Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
     Mochi-ized By Thomas Herve (_firstname_@nimail.org)
 ***/
 if (typeof(dojo) != 'undefined') {
     dojo.provide('MochiKit.DragAndDrop');
     dojo.require('MochiKit.Base');
     dojo.require('MochiKit.DOM');
     dojo.require('MochiKit.Iter');
     dojo.require('MochiKit.Visual');
     dojo.require('MochiKit.Signal');
 }
 if (typeof(JSAN) != 'undefined') {
     JSAN.use("MochiKit.Base", []);
     JSAN.use("MochiKit.DOM", []);
     JSAN.use("MochiKit.Visual", []);
     JSAN.use("MochiKit.Iter", []);
     JSAN.use("MochiKit.Signal", []);
 }
 try {
     if (typeof(MochiKit.Base) == 'undefined' ||
         typeof(MochiKit.DOM) == 'undefined' ||
         typeof(MochiKit.Visual) == 'undefined' ||
         typeof(MochiKit.Signal) == 'undefined' ||
         typeof(MochiKit.Iter) == 'undefined') {
         throw "";
     }
 } catch (e) {
     throw "MochiKit.DragAndDrop depends on MochiKit.Base, MochiKit.DOM, MochiKit.Visual, MochiKit.Signal and MochiKit.Iter!";
 }
 if (typeof(MochiKit.DragAndDrop) == 'undefined') {
     MochiKit.DragAndDrop = {};
 }
 MochiKit.DragAndDrop.NAME = 'MochiKit.DragAndDrop';
 MochiKit.DragAndDrop.VERSION = '1.4';
 MochiKit.DragAndDrop.__repr__ = function () {
     return '[' + this.NAME + ' ' + this.VERSION + ']';
 };
 MochiKit.DragAndDrop.toString = function () {
     return this.__repr__();
 };
 MochiKit.DragAndDrop.EXPORT = [
     "Droppable",
     "Draggable"
 ];
 MochiKit.DragAndDrop.EXPORT_OK = [
     "Droppables",
     "Draggables"
 ];
 MochiKit.DragAndDrop.Droppables = {
     /***
     Manage all droppables. Shouldn't be used, use the Droppable object instead.
     ***/
     drops: [],
     remove: function (element) {
         this.drops = MochiKit.Base.filter(function (d) {
             return d.element != MochiKit.DOM.getElement(element);
         }, this.drops);
     },
     register: function (drop) {
         this.drops.push(drop);
     },
     unregister: function (drop) {
         this.drops = MochiKit.Base.filter(function (d) {
             return d != drop;
         }, this.drops);
     },
     prepare: function (element) {
         MochiKit.Base.map(function (drop) {
             if (drop.isAccepted(element)) {
                 if (drop.options.activeclass) {
                     MochiKit.DOM.addElementClass(drop.element,
                                                  drop.options.activeclass);
                 }
                 drop.options.onactive(drop.element, element);
             }
         }, this.drops);
     },
     findDeepestChild: function (drops) {
         deepest = drops[0];
         for (i = 1; i < drops.length; ++i) {
             if (MochiKit.DOM.isParent(drops[i].element, deepest.element)) {
                 deepest = drops[i];
             }
         }
         return deepest;
     },
     show: function (point, element) {
         if (!this.drops.length) {
             return;
         }
         var affected = [];
         if (this.last_active) {
             this.last_active.deactivate();
         }
         MochiKit.Iter.forEach(this.drops, function (drop) {
             if (drop.isAffected(point, element)) {
                 affected.push(drop);
             }
         });
         if (affected.length > 0) {
             drop = this.findDeepestChild(affected);
             MochiKit.Position.within(drop.element, point.page.x, point.page.y);
             drop.options.onhover(element, drop.element,
                 MochiKit.Position.overlap(drop.options.overlap, drop.element));
             drop.activate();
         }
     },
     fire: function (event, element) {
         if (!this.last_active) {
             return;
         }
         MochiKit.Position.prepare();
         if (this.last_active.isAffected(event.mouse(), element)) {
             this.last_active.options.ondrop(element,
                this.last_active.element, event);
         }
     },
     reset: function (element) {
         MochiKit.Base.map(function (drop) {
             if (drop.options.activeclass) {
                 MochiKit.DOM.removeElementClass(drop.element,
                                                 drop.options.activeclass);
             }
             drop.options.ondesactive(drop.element, element);
         }, this.drops);
         if (this.last_active) {
             this.last_active.deactivate();
         }
     }
 };
 /** @id MochiKit.DragAndDrop.Droppable */
 MochiKit.DragAndDrop.Droppable = function (element, options) {
     var cls = arguments.callee;
     if (!(this instanceof cls)) {
         return new cls(element, options);
     }
     this.__init__(element, options);
 };
 MochiKit.DragAndDrop.Droppable.prototype = {
     /***
     A droppable object. Simple use is to create giving an element:
         new MochiKit.DragAndDrop.Droppable('myelement');
     Generally you'll want to define the 'ondrop' function and maybe the
     'accept' option to filter draggables.
     ***/
     __class__: MochiKit.DragAndDrop.Droppable,
     __init__: function (element, /* optional */options) {
         var d = MochiKit.DOM;
         var b = MochiKit.Base;
         this.element = d.getElement(element);
         this.options = b.update({
             /** @id MochiKit.DragAndDrop.greedy */
             greedy: true,
             /** @id MochiKit.DragAndDrop.hoverclass */
             hoverclass: null,
             /** @id MochiKit.DragAndDrop.activeclass */
             activeclass: null,
             /** @id MochiKit.DragAndDrop.hoverfunc */
             hoverfunc: b.noop,
             /** @id MochiKit.DragAndDrop.accept */
             accept: null,
             /** @id MochiKit.DragAndDrop.onactive */
             onactive: b.noop,
             /** @id MochiKit.DragAndDrop.ondesactive */
             ondesactive: b.noop,
             /** @id MochiKit.DragAndDrop.onhover */
             onhover: b.noop,
             /** @id MochiKit.DragAndDrop.ondrop */
             ondrop: b.noop,
             /** @id MochiKit.DragAndDrop.containment */
             containment: [],
             tree: false
         }, options || {});
         // cache containers
         this.options._containers = [];
         b.map(MochiKit.Base.bind(function (c) {
             this.options._containers.push(d.getElement(c));
         }, this), this.options.containment);
         d.makePositioned(this.element); // fix IE
         MochiKit.DragAndDrop.Droppables.register(this);
     },
     /** @id MochiKit.DragAndDrop.isContained */
     isContained: function (element) {
         if (this.options._containers.length) {
             var containmentNode;
             if (this.options.tree) {
                 containmentNode = element.treeNode;
             } else {
                 containmentNode = element.parentNode;
             }
             return MochiKit.Iter.some(this.options._containers, function (c) {
                 return containmentNode == c;
             });
         } else {
             return true;
         }
     },
     /** @id MochiKit.DragAndDrop.isAccepted */
     isAccepted: function (element) {
         return ((!this.options.accept) || MochiKit.Iter.some(
           this.options.accept, function (c) {
             return MochiKit.DOM.hasElementClass(element, c);
         }));
     },
     /** @id MochiKit.DragAndDrop.isAffected */
     isAffected: function (point, element) {
         return ((this.element != element) &&
                 this.isContained(element) &&
                 this.isAccepted(element) &&
                 MochiKit.Position.within(this.element, point.page.x,
                                                        point.page.y));
     },
     /** @id MochiKit.DragAndDrop.deactivate */
     deactivate: function () {
         /***
         A droppable is deactivate when a draggable has been over it and left.
         ***/
         if (this.options.hoverclass) {
             MochiKit.DOM.removeElementClass(this.element,
                                             this.options.hoverclass);
         }
         this.options.hoverfunc(this.element, false);
         MochiKit.DragAndDrop.Droppables.last_active = null;
     },
     /** @id MochiKit.DragAndDrop.activate */
     activate: function () {
         /***
         A droppable is active when a draggable is over it.
         ***/
         if (this.options.hoverclass) {
             MochiKit.DOM.addElementClass(this.element, this.options.hoverclass);
         }
         this.options.hoverfunc(this.element, true);
         MochiKit.DragAndDrop.Droppables.last_active = this;
     },
     /** @id MochiKit.DragAndDrop.destroy */
     destroy: function () {
         /***
         Delete this droppable.
         ***/
         MochiKit.DragAndDrop.Droppables.unregister(this);
     },
     /** @id MochiKit.DragAndDrop.repr */
     repr: function () {
         return '[' + this.__class__.NAME + ", options:" + MochiKit.Base.repr(this.options) + "]";
     }
 };
 MochiKit.DragAndDrop.Draggables = {
     /***
     Manage draggables elements. Not intended to direct use.
     ***/
     drags: [],
     register: function (draggable) {
         if (this.drags.length === 0) {
             var conn = MochiKit.Signal.connect;
             this.eventMouseUp = conn(document, 'onmouseup', this, this.endDrag);
             this.eventMouseMove = conn(document, 'onmousemove', this,
                                        this.updateDrag);
             this.eventKeypress = conn(document, 'onkeypress', this,
                                       this.keyPress);
         }
         this.drags.push(draggable);
     },
     unregister: function (draggable) {
         this.drags = MochiKit.Base.filter(function (d) {
             return d != draggable;
         }, this.drags);
         if (this.drags.length === 0) {
             var disc = MochiKit.Signal.disconnect;
             disc(this.eventMouseUp);
             disc(this.eventMouseMove);
             disc(this.eventKeypress);
         }
     },
     activate: function (draggable) {
         // allows keypress events if window is not currently focused
         // fails for Safari
         window.focus();
         this.activeDraggable = draggable;
     },
     deactivate: function () {
         this.activeDraggable = null;
     },
     updateDrag: function (event) {
         if (!this.activeDraggable) {
             return;
         }
         var pointer = event.mouse();
         // Mozilla-based browsers fire successive mousemove events with
         // the same coordinates, prevent needless redrawing (moz bug?)
         if (this._lastPointer && (MochiKit.Base.repr(this._lastPointer.page) ==
                                   MochiKit.Base.repr(pointer.page))) {
             return;
         }
         this._lastPointer = pointer;
         this.activeDraggable.updateDrag(event, pointer);
     },
     endDrag: function (event) {
         if (!this.activeDraggable) {
             return;
         }
         this._lastPointer = null;
         this.activeDraggable.endDrag(event);
         this.activeDraggable = null;
     },
     keyPress: function (event) {
         if (this.activeDraggable) {
             this.activeDraggable.keyPress(event);
         }
     },
     notify: function (eventName, draggable, event) {
         MochiKit.Signal.signal(this, eventName, draggable, event);
     }
 };
 /** @id MochiKit.DragAndDrop.Draggable */
 MochiKit.DragAndDrop.Draggable = function (element, options) {
     var cls = arguments.callee;
     if (!(this instanceof cls)) {
         return new cls(element, options);
     }
     this.__init__(element, options);
 };
 MochiKit.DragAndDrop.Draggable.prototype = {
     /***
     A draggable object. Simple instantiate :
         new MochiKit.DragAndDrop.Draggable('myelement');
     ***/
     __class__ : MochiKit.DragAndDrop.Draggable,
     __init__: function (element, /* optional */options) {
         var v = MochiKit.Visual;
         var b = MochiKit.Base;
         options = b.update({
             /** @id MochiKit.DragAndDrop.handle */
             handle: false,
             /** @id MochiKit.DragAndDrop.starteffect */
             starteffect: function (innerelement) {
                 this._savedOpacity = MochiKit.Style.getStyle(innerelement, 'opacity') || 1.0;
                 new v.Opacity(innerelement, {duration:0.2, from:this._savedOpacity, to:0.7});
             },
             /** @id MochiKit.DragAndDrop.reverteffect */
             reverteffect: function (innerelement, top_offset, left_offset) {
                 var dur = Math.sqrt(Math.abs(top_offset^2) +
                           Math.abs(left_offset^2))*0.02;
                 return new v.Move(innerelement,
                             {x: -left_offset, y: -top_offset, duration: dur});
             },
             /** @id MochiKit.DragAndDrop.endeffect */
             endeffect: function (innerelement) {
                 new v.Opacity(innerelement, {duration:0.2, from:0.7, to:this._savedOpacity});
             },
             /** @id MochiKit.DragAndDrop.onchange */
             onchange: b.noop,
             /** @id MochiKit.DragAndDrop.zindex */
             zindex: 1000,
             /** @id MochiKit.DragAndDrop.revert */
             revert: false,
             /** @id MochiKit.DragAndDrop.scroll */
             scroll: false,
             /** @id MochiKit.DragAndDrop.scrollSensitivity */
             scrollSensitivity: 20,
             /** @id MochiKit.DragAndDrop.scrollSpeed */
             scrollSpeed: 15,
             // false, or xy or [x, y] or function (x, y){return [x, y];}
             /** @id MochiKit.DragAndDrop.snap */
             snap: false
         }, options || {});
         var d = MochiKit.DOM;
         this.element = d.getElement(element);
         if (options.handle && (typeof(options.handle) == 'string')) {
             this.handle = d.getFirstElementByTagAndClassName(null,
                                        options.handle, this.element);
         }
         if (!this.handle) {
             this.handle = d.getElement(options.handle);
         }
         if (!this.handle) {
             this.handle = this.element;
         }
         if (options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
             options.scroll = d.getElement(options.scroll);
             this._isScrollChild = MochiKit.DOM.isChildNode(this.element, options.scroll);
         }
         d.makePositioned(this.element);  // fix IE
         this.delta = this.currentDelta();
         this.options = options;
         this.dragging = false;
         this.eventMouseDown = MochiKit.Signal.connect(this.handle,
                               'onmousedown', this, this.initDrag);
         MochiKit.DragAndDrop.Draggables.register(this);
     },
     /** @id MochiKit.DragAndDrop.destroy */
     destroy: function () {
         MochiKit.Signal.disconnect(this.eventMouseDown);
         MochiKit.DragAndDrop.Draggables.unregister(this);
     },
     /** @id MochiKit.DragAndDrop.currentDelta */
     currentDelta: function () {
         var s = MochiKit.Style.getStyle;
         return [
           parseInt(s(this.element, 'left') || '0'),
           parseInt(s(this.element, 'top') || '0')];
     },
     /** @id MochiKit.DragAndDrop.initDrag */
     initDrag: function (event) {
         if (!event.mouse().button.left) {
             return;
         }
         // abort on form elements, fixes a Firefox issue
         var src = event.target();
         var tagName = (src.tagName || '').toUpperCase();
         if (tagName === 'INPUT' || tagName === 'SELECT' ||
             tagName === 'OPTION' || tagName === 'BUTTON' ||
             tagName === 'TEXTAREA') {
             return;
         }
         if (this._revert) {
             this._revert.cancel();
             this._revert = null;
         }
         var pointer = event.mouse();
         var pos = MochiKit.Position.cumulativeOffset(this.element);
         this.offset = [pointer.page.x - pos.x, pointer.page.y - pos.y];
         MochiKit.DragAndDrop.Draggables.activate(this);
         event.stop();
     },
     /** @id MochiKit.DragAndDrop.startDrag */
     startDrag: function (event) {
         this.dragging = true;
         if (this.options.selectclass) {
             MochiKit.DOM.addElementClass(this.element,
                                          this.options.selectclass);
         }
         if (this.options.zindex) {
             this.originalZ = parseInt(MochiKit.Style.getStyle(this.element,
                                       'z-index') || '0');
             this.element.style.zIndex = this.options.zindex;
         }
         if (this.options.ghosting) {
             this._clone = this.element.cloneNode(true);
             this.ghostPosition = MochiKit.Position.absolutize(this.element);
             this.element.parentNode.insertBefore(this._clone, this.element);
         }
         if (this.options.scroll) {
             if (this.options.scroll == window) {
                 var where = this._getWindowScroll(this.options.scroll);
                 this.originalScrollLeft = where.left;
                 this.originalScrollTop = where.top;
             } else {
                 this.originalScrollLeft = this.options.scroll.scrollLeft;
                 this.originalScrollTop = this.options.scroll.scrollTop;
             }
         }
         MochiKit.DragAndDrop.Droppables.prepare(this.element);
         MochiKit.DragAndDrop.Draggables.notify('start', this, event);
         if (this.options.starteffect) {
             this.options.starteffect(this.element);
         }
     },
     /** @id MochiKit.DragAndDrop.updateDrag */
     updateDrag: function (event, pointer) {
         if (!this.dragging) {
             this.startDrag(event);
         }
         MochiKit.Position.prepare();
         MochiKit.DragAndDrop.Droppables.show(pointer, this.element);
         MochiKit.DragAndDrop.Draggables.notify('drag', this, event);
         this.draw(pointer);
         this.options.onchange(this);
         if (this.options.scroll) {
             this.stopScrolling();
             var p, q;
             if (this.options.scroll == window) {
                 var s = this._getWindowScroll(this.options.scroll);
                 p = new MochiKit.Style.Coordinates(s.left, s.top);
                 q = new MochiKit.Style.Coordinates(s.left + s.width,
                                                    s.top + s.height);
             } else {
                 p = MochiKit.Position.page(this.options.scroll);
                 p.x += this.options.scroll.scrollLeft;
                 p.y += this.options.scroll.scrollTop;
                 p.x += (window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0);
                 p.y += (window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0);
                 q = new MochiKit.Style.Coordinates(p.x + this.options.scroll.offsetWidth,
                                                    p.y + this.options.scroll.offsetHeight);
             }
             var speed = [0, 0];
             if (pointer.page.x > (q.x - this.options.scrollSensitivity)) {
                 speed[0] = pointer.page.x - (q.x - this.options.scrollSensitivity);
             } else if (pointer.page.x < (p.x + this.options.scrollSensitivity)) {
                 speed[0] = pointer.page.x - (p.x + this.options.scrollSensitivity);
             }
             if (pointer.page.y > (q.y - this.options.scrollSensitivity)) {
                 speed[1] = pointer.page.y - (q.y - this.options.scrollSensitivity);
             } else if (pointer.page.y < (p.y + this.options.scrollSensitivity)) {
                 speed[1] = pointer.page.y - (p.y + this.options.scrollSensitivity);
             }
             this.startScrolling(speed);
         }
         // fix AppleWebKit rendering
         if (/AppleWebKit'/.test(navigator.appVersion)) {
             window.scrollBy(0, 0);
         }
         event.stop();
     },
     /** @id MochiKit.DragAndDrop.finishDrag */
     finishDrag: function (event, success) {
         var dr = MochiKit.DragAndDrop;
         this.dragging = false;
         if (this.options.selectclass) {
             MochiKit.DOM.removeElementClass(this.element,
                                             this.options.selectclass);
         }
         if (this.options.ghosting) {
             // XXX: from a user point of view, it would be better to remove
             // the node only *after* the MochiKit.Visual.Move end when used
             // with revert.
             MochiKit.Position.relativize(this.element, this.ghostPosition);
             MochiKit.DOM.removeElement(this._clone);
             this._clone = null;
         }
         if (success) {
             dr.Droppables.fire(event, this.element);
         }
         dr.Draggables.notify('end', this, event);
         var revert = this.options.revert;
         if (revert && typeof(revert) == 'function') {
             revert = revert(this.element);
         }
         var d = this.currentDelta();
         if (revert && this.options.reverteffect) {
             this._revert = this.options.reverteffect(this.element,
                 d[1] - this.delta[1], d[0] - this.delta[0]);
         } else {
             this.delta = d;
         }
         if (this.options.zindex) {
             this.element.style.zIndex = this.originalZ;
         }
         if (this.options.endeffect) {
             this.options.endeffect(this.element);
         }
         dr.Draggables.deactivate();
         dr.Droppables.reset(this.element);
     },
     /** @id MochiKit.DragAndDrop.keyPress */
     keyPress: function (event) {
         if (event.key().string != "KEY_ESCAPE") {
             return;
         }
         this.finishDrag(event, false);
         event.stop();
     },
     /** @id MochiKit.DragAndDrop.endDrag */
     endDrag: function (event) {
         if (!this.dragging) {
             return;
         }
         this.stopScrolling();
         this.finishDrag(event, true);
         event.stop();
     },
     /** @id MochiKit.DragAndDrop.draw */
     draw: function (point) {
         var pos = MochiKit.Position.cumulativeOffset(this.element);
         var d = this.currentDelta();
         pos.x -= d[0];
         pos.y -= d[1];
         if (this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
             pos.x -= this.options.scroll.scrollLeft - this.originalScrollLeft;
             pos.y -= this.options.scroll.scrollTop - this.originalScrollTop;
         }
         var p = [point.page.x - pos.x - this.offset[0],
                  point.page.y - pos.y - this.offset[1]];
         if (this.options.snap) {
             if (typeof(this.options.snap) == 'function') {
                 p = this.options.snap(p[0], p[1]);
             } else {
                 if (this.options.snap instanceof Array) {
                     var i = -1;
                     p = MochiKit.Base.map(MochiKit.Base.bind(function (v) {
                             i += 1;
                             return Math.round(v/this.options.snap[i]) *
                                    this.options.snap[i];
                         }, this), p);
                 } else {
                     p = MochiKit.Base.map(MochiKit.Base.bind(function (v) {
                         return Math.round(v/this.options.snap) *
                                this.options.snap;
                         }, this), p);
                 }
             }
         }
         var style = this.element.style;
         if ((!this.options.constraint) ||
             (this.options.constraint == 'horizontal')) {
             style.left = p[0] + 'px';
         }
         if ((!this.options.constraint) ||
             (this.options.constraint == 'vertical')) {
             style.top = p[1] + 'px';
         }
         if (style.visibility == 'hidden') {
             style.visibility = '';  // fix gecko rendering
         }
     },
     /** @id MochiKit.DragAndDrop.stopScrolling */
     stopScrolling: function () {
         if (this.scrollInterval) {
             clearInterval(this.scrollInterval);
             this.scrollInterval = null;
             MochiKit.DragAndDrop.Draggables._lastScrollPointer = null;
         }
     },
     /** @id MochiKit.DragAndDrop.startScrolling */
     startScrolling: function (speed) {
         if (!speed[0] && !speed[1]) {
             return;
         }
         this.scrollSpeed = [speed[0] * this.options.scrollSpeed,
                             speed[1] * this.options.scrollSpeed];
         this.lastScrolled = new Date();
         this.scrollInterval = setInterval(MochiKit.Base.bind(this.scroll, this), 10);
     },
     /** @id MochiKit.DragAndDrop.scroll */
     scroll: function () {
         var current = new Date();
         var delta = current - this.lastScrolled;
         this.lastScrolled = current;
         if (this.options.scroll == window) {
             var s = this._getWindowScroll(this.options.scroll);
             if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
                 var dm = delta / 1000;
                 this.options.scroll.scrollTo(s.left + dm * this.scrollSpeed[0],
                                              s.top + dm * this.scrollSpeed[1]);
             }
         } else {
             this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
             this.options.scroll.scrollTop += this.scrollSpeed[1] * delta / 1000;
         }
         var d = MochiKit.DragAndDrop;
         MochiKit.Position.prepare();
         d.Droppables.show(d.Draggables._lastPointer, this.element);
         d.Draggables.notify('drag', this);
         if (this._isScrollChild) {
             d.Draggables._lastScrollPointer = d.Draggables._lastScrollPointer || d.Draggables._lastPointer;
             d.Draggables._lastScrollPointer.x += this.scrollSpeed[0] * delta / 1000;
             d.Draggables._lastScrollPointer.y += this.scrollSpeed[1] * delta / 1000;
             if (d.Draggables._lastScrollPointer.x < 0) {
                 d.Draggables._lastScrollPointer.x = 0;
             }
             if (d.Draggables._lastScrollPointer.y < 0) {
                 d.Draggables._lastScrollPointer.y = 0;
             }
             this.draw(d.Draggables._lastScrollPointer);
         }
         this.options.onchange(this);
     },
     _getWindowScroll: function (win) {
         var vp, w, h;
         MochiKit.DOM.withWindow(win, function () {
             vp = MochiKit.Style.getViewportPosition(win.document);
         });
         if (win.innerWidth) {
             w = win.innerWidth;
             h = win.innerHeight;
         } else if (win.document.documentElement && win.document.documentElement.clientWidth) {
             w = win.document.documentElement.clientWidth;
             h = win.document.documentElement.clientHeight;
         } else {
             w = win.document.body.offsetWidth;
             h = win.document.body.offsetHeight;
         }
         return {top: vp.x, left: vp.y, width: w, height: h};
     },
     /** @id MochiKit.DragAndDrop.repr */
     repr: function () {
         return '[' + this.__class__.NAME + ", options:" + MochiKit.Base.repr(this.options) + "]";
     }
 };
 MochiKit.DragAndDrop.__new__ = function () {
     MochiKit.Base.nameFunctions(this);
     this.EXPORT_TAGS = {
         ":common": this.EXPORT,
         ":all": MochiKit.Base.concat(this.EXPORT, this.EXPORT_OK)
     };
 };
 MochiKit.DragAndDrop.__new__();
 MochiKit.Base._exportSymbols(this, MochiKit.DragAndDrop);