/instiki/svnpassword

// script.aculo.us dragdrop.js v1.9.0, Thu Dec 23 16:54:48 -0500 2010

// Copyright (c) 2005-2010 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)

//

// script.aculo.us is freely distributable under the terms of an MIT-style license.

// For details, see the script.aculo.us web site: http://script.aculo.us/

if(Object.isUndefined(Effect))

 throw("dragdrop.js requires including script.aculo.us' effects.js library");

var Droppables = {

 drops: [],

 remove: function(element) {

 this.drops = this.drops.reject(function(d) { return d.element==$(element) });

 },

 add: function(element) {

 element = $(element);

 var options = Object.extend({

 greedy: true,

 hoverclass: null,

 tree: false

 }, arguments[1] || { });

 // cache containers

 if(options.containment) {

 options._containers = [];

 var containment = options.containment;

 if(Object.isArray(containment)) {

 containment.each( function(c) { options._containers.push($(c)) });

 } else {

 options._containers.push($(containment));

 }

 }

 if(options.accept) options.accept = [options.accept].flatten();

 Element.makePositioned(element); // fix IE

 options.element = element;

 this.drops.push(options);

 },

 findDeepestChild: function(drops) {

 deepest = drops[0];

 for (i = 1; i < drops.length; ++i)

 if (Element.isParent(drops[i].element, deepest.element))

 deepest = drops[i];

 return deepest;

 },

 isContained: function(element, drop) {

 var containmentNode;

 if(drop.tree) {

 containmentNode = element.treeNode;

 } else {

 containmentNode = element.parentNode;

 }

 return drop._containers.detect(function(c) { return containmentNode == c });

 },

 isAffected: function(point, element, drop) {

 return (

 (drop.element!=element) &&

 ((!drop._containers) ||

 this.isContained(element, drop)) &&

 ((!drop.accept) ||

 (Element.classNames(element).detect(

 function(v) { return drop.accept.include(v) } ) )) &&

 Position.within(drop.element, point[0], point[1]) );

 },

 deactivate: function(drop) {

 if(drop.hoverclass)

 Element.removeClassName(drop.element, drop.hoverclass);

 this.last_active = null;

 },

 activate: function(drop) {

 if(drop.hoverclass)

 Element.addClassName(drop.element, drop.hoverclass);

 this.last_active = drop;

 },

 show: function(point, element) {

 if(!this.drops.length) return;

 var drop, affected = [];

 this.drops.each( function(drop) {

 if(Droppables.isAffected(point, element, drop))

 affected.push(drop);

 });

 if(affected.length>0)

 drop = Droppables.findDeepestChild(affected);

 if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);

 if (drop) {

 Position.within(drop.element, point[0], point[1]);

 if(drop.onHover)

 drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));

 if (drop != this.last_active) Droppables.activate(drop);

 }

 },

 fire: function(event, element) {

 if(!this.last_active) return;

 Position.prepare();

 if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))

 if (this.last_active.onDrop) {

 this.last_active.onDrop(element, this.last_active.element, event);

 return true;

 }

 },

 reset: function() {

 if(this.last_active)

 this.deactivate(this.last_active);

 }

};

var Draggables = {

 drags: [],

 observers: [],

 register: function(draggable) {

 if(this.drags.length == 0) {

 this.eventMouseUp = this.endDrag.bindAsEventListener(this);

 this.eventMouseMove = this.updateDrag.bindAsEventListener(this);

 this.eventKeypress = this.keyPress.bindAsEventListener(this);

 Event.observe(document, "mouseup", this.eventMouseUp);

 Event.observe(document, "mousemove", this.eventMouseMove);

 Event.observe(document, "keypress", this.eventKeypress);

 }

 this.drags.push(draggable);

 },

 unregister: function(draggable) {

 this.drags = this.drags.reject(function(d) { return d==draggable });

 if(this.drags.length == 0) {

 Event.stopObserving(document, "mouseup", this.eventMouseUp);

 Event.stopObserving(document, "mousemove", this.eventMouseMove);

 Event.stopObserving(document, "keypress", this.eventKeypress);

 }

 },

 activate: function(draggable) {

 if(draggable.options.delay) {

 this._timeout = setTimeout(function() {

 Draggables._timeout = null;

 window.focus();

 Draggables.activeDraggable = draggable;

 }.bind(this), draggable.options.delay);

 } else {

 window.focus(); // allows keypress events if window isn't currently focused, fails for Safari

 this.activeDraggable = draggable;

 }

 },

 deactivate: function() {

 this.activeDraggable = null;

 },

 updateDrag: function(event) {

 if(!this.activeDraggable) return;

 var pointer = [Event.pointerX(event), Event.pointerY(event)];

 // Mozilla-based browsers fire successive mousemove events with

 // the same coordinates, prevent needless redrawing (moz bug?)

 if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;

 this._lastPointer = pointer;

 this.activeDraggable.updateDrag(event, pointer);

 },

 endDrag: function(event) {

 if(this._timeout) {

 clearTimeout(this._timeout);

 this._timeout = null;

 }

 if(!this.activeDraggable) return;

 this._lastPointer = null;

 this.activeDraggable.endDrag(event);

 this.activeDraggable = null;

 },

 keyPress: function(event) {

 if(this.activeDraggable)

 this.activeDraggable.keyPress(event);

 },

 addObserver: function(observer) {

 this.observers.push(observer);

 this._cacheObserverCallbacks();

 },

 removeObserver: function(element) { // element instead of observer fixes mem leaks

 this.observers = this.observers.reject( function(o) { return o.element==element });

 this._cacheObserverCallbacks();

 },

 notify: function(eventName, draggable, event) { // 'onStart', 'onEnd', 'onDrag'

 if(this[eventName+'Count'] > 0)

 this.observers.each( function(o) {

 if(o[eventName]) o[eventName](eventName, draggable, event);

 });

 if(draggable.options[eventName]) draggable.options[eventName](draggable, event);

 },

 _cacheObserverCallbacks: function() {

 ['onStart','onEnd','onDrag'].each( function(eventName) {

 Draggables[eventName+'Count'] = Draggables.observers.select(

 function(o) { return o[eventName]; }

 ).length;

 });

 }

};

/*--------------------------------------------------------------------------*/

var Draggable = Class.create({

 initialize: function(element) {

 var defaults = {

 handle: false,

 reverteffect: function(element, top_offset, left_offset) {

 var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;

 new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,

 queue: {scope:'_draggable', position:'end'}

 });

 },

 endeffect: function(element) {

 var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;

 new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity,

 queue: {scope:'_draggable', position:'end'},

 afterFinish: function(){

 Draggable._dragging[element] = false

 }

 });

 },

 zindex: 1000,

 revert: false,

 quiet: false,

 scroll: false,

 scrollSensitivity: 20,

 scrollSpeed: 15,

 snap: false, // false, or xy or [x,y] or function(x,y){ return [x,y] }

 delay: 0

 };

 if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))

 Object.extend(defaults, {

 starteffect: function(element) {

 element._opacity = Element.getOpacity(element);

 Draggable._dragging[element] = true;

 new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});

 }

 });

 var options = Object.extend(defaults, arguments[1] || { });

 this.element = $(element);

 if(options.handle && Object.isString(options.handle))

 this.handle = this.element.down('.'+options.handle, 0);

 if(!this.handle) this.handle = $(options.handle);

 if(!this.handle) this.handle = this.element;

 if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {

 options.scroll = $(options.scroll);

 this._isScrollChild = Element.childOf(this.element, options.scroll);

 }

 Element.makePositioned(this.element); // fix IE

 this.options = options;

 this.dragging = false;

 this.eventMouseDown = this.initDrag.bindAsEventListener(this);

 Event.observe(this.handle, "mousedown", this.eventMouseDown);

 Draggables.register(this);

 },

 destroy: function() {

 Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);

 Draggables.unregister(this);

 },

 currentDelta: function() {

 return([

 parseInt(Element.getStyle(this.element,'left') || '0'),

 parseInt(Element.getStyle(this.element,'top') || '0')]);

 },

 initDrag: function(event) {

 if(!Object.isUndefined(Draggable._dragging[this.element]) &&

 Draggable._dragging[this.element]) return;

 if(Event.isLeftClick(event)) {

 // abort on form elements, fixes a Firefox issue

 var src = Event.element(event);

 if((tag_name = src.tagName.toUpperCase()) && (

 tag_name=='INPUT' ||

 tag_name=='SELECT' ||

 tag_name=='OPTION' ||

 tag_name=='BUTTON' ||

 tag_name=='TEXTAREA')) return;

 var pointer = [Event.pointerX(event), Event.pointerY(event)];

 var pos = this.element.cumulativeOffset();

 this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });

 Draggables.activate(this);

 Event.stop(event);

 }

 },

 startDrag: function(event) {

 this.dragging = true;

 if(!this.delta)

 this.delta = this.currentDelta();

 if(this.options.zindex) {

 this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);

 this.element.style.zIndex = this.options.zindex;

 }

 if(this.options.ghosting) {

 this._clone = this.element.cloneNode(true);

 this._originallyAbsolute = (this.element.getStyle('position') == 'absolute');

 if (!this._originallyAbsolute)

 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;

 }

 }

 Draggables.notify('onStart', this, event);

 if(this.options.starteffect) this.options.starteffect(this.element);

 },

 updateDrag: function(event, pointer) {

 if(!this.dragging) this.startDrag(event);

 if(!this.options.quiet){

 Position.prepare();

 Droppables.show(pointer, this.element);

 }

 Draggables.notify('onDrag', this, event);

 this.draw(pointer);

 if(this.options.change) this.options.change(this);

 if(this.options.scroll) {

 this.stopScrolling();

 var p;

 if (this.options.scroll == window) {

 with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }

 } else {

 p = Position.page(this.options.scroll).toArray();

 p[0] += this.options.scroll.scrollLeft + Position.deltaX;

 p[1] += this.options.scroll.scrollTop + Position.deltaY;

 p.push(p[0]+this.options.scroll.offsetWidth);

 p.push(p[1]+this.options.scroll.offsetHeight);

 }

 var speed = [0,0];

 if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);

 if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);

 if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);

 if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);

 this.startScrolling(speed);

 }

 // fix AppleWebKit rendering

 if(Prototype.Browser.WebKit) window.scrollBy(0,0);

 Event.stop(event);

 },

 finishDrag: function(event, success) {

 this.dragging = false;

 if(this.options.quiet){

 Position.prepare();

 var pointer = [Event.pointerX(event), Event.pointerY(event)];

 Droppables.show(pointer, this.element);

 }

 if(this.options.ghosting) {

 if (!this._originallyAbsolute)

 Position.relativize(this.element);

 delete this._originallyAbsolute;

 Element.remove(this._clone);

 this._clone = null;

 }

 var dropped = false;

 if(success) {

 dropped = Droppables.fire(event, this.element);

 if (!dropped) dropped = false;

 }

 if(dropped && this.options.onDropped) this.options.onDropped(this.element);

 Draggables.notify('onEnd', this, event);

 var revert = this.options.revert;

 if(revert && Object.isFunction(revert)) revert = revert(this.element);

 var d = this.currentDelta();

 if(revert && this.options.reverteffect) {

 if (dropped == 0 || revert != 'failure')

 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);

 Draggables.deactivate(this);

 Droppables.reset();

 },

 keyPress: function(event) {

 if(event.keyCode!=Event.KEY_ESC) return;

 this.finishDrag(event, false);

 Event.stop(event);

 },

 endDrag: function(event) {

 if(!this.dragging) return;

 this.stopScrolling();

 this.finishDrag(event, true);

 Event.stop(event);

 },

 draw: function(point) {

 var pos = this.element.cumulativeOffset();

 if(this.options.ghosting) {

 var r = Position.realOffset(this.element);

 pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;

 }

 var d = this.currentDelta();

 pos[0] -= d[0]; pos[1] -= d[1];

 if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {

 pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;

 pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;

 }

 var p = [0,1].map(function(i){

 return (point[i]-pos[i]-this.offset[i])

 }.bind(this));

 if(this.options.snap) {

 if(Object.isFunction(this.options.snap)) {

 p = this.options.snap(p[0],p[1],this);

 } else {

 if(Object.isArray(this.options.snap)) {

 p = p.map( function(v, i) {

 return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this));

 } else {

 p = p.map( function(v) {

 return (v/this.options.snap).round()*this.options.snap }.bind(this));

 }

 }}

 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

 },

 stopScrolling: function() {

 if(this.scrollInterval) {

 clearInterval(this.scrollInterval);

 this.scrollInterval = null;

 Draggables._lastScrollPointer = null;

 }

 },

 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(this.scroll.bind(this), 10);

 },

 scroll: function() {

 var current = new Date();

 var delta = current - this.lastScrolled;

 this.lastScrolled = current;

 if(this.options.scroll == window) {

 with (this._getWindowScroll(this.options.scroll)) {

 if (this.scrollSpeed[0] || this.scrollSpeed[1]) {

 var d = delta / 1000;

 this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );

 }

 }

 } else {

 this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;

 this.options.scroll.scrollTop += this.scrollSpeed[1] * delta / 1000;

 }

 Position.prepare();

 Droppables.show(Draggables._lastPointer, this.element);

 Draggables.notify('onDrag', this);

 if (this._isScrollChild) {

 Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);

 Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;

 Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;

 if (Draggables._lastScrollPointer[0] < 0)

 Draggables._lastScrollPointer[0] = 0;

 if (Draggables._lastScrollPointer[1] < 0)

 Draggables._lastScrollPointer[1] = 0;

 this.draw(Draggables._lastScrollPointer);

 }

 if(this.options.change) this.options.change(this);

 },

 _getWindowScroll: function(w) {

 var T, L, W, H;

 with (w.document) {

 if (w.document.documentElement && documentElement.scrollTop) {

 T = documentElement.scrollTop;

 L = documentElement.scrollLeft;

 } else if (w.document.body) {

 T = body.scrollTop;

 L = body.scrollLeft;

 }

 if (w.innerWidth) {

 W = w.innerWidth;

 H = w.innerHeight;

 } else if (w.document.documentElement && documentElement.clientWidth) {

 W = documentElement.clientWidth;

 H = documentElement.clientHeight;

 } else {

 W = body.offsetWidth;

 H = body.offsetHeight;

 }

 }

 return { top: T, left: L, width: W, height: H };

 }

});

Draggable._dragging = { };

/*--------------------------------------------------------------------------*/

var SortableObserver = Class.create({

 initialize: function(element, observer) {

 this.element = $(element);

 this.observer = observer;

 this.lastValue = Sortable.serialize(this.element);

 },

 onStart: function() {

 this.lastValue = Sortable.serialize(this.element);

 },

 onEnd: function() {

 Sortable.unmark();

 if(this.lastValue != Sortable.serialize(this.element))

 this.observer(this.element)

 }

});

var Sortable = {

 SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,

 sortables: { },

 _findRootElement: function(element) {

 while (element.tagName.toUpperCase() != "BODY") {

 if(element.id && Sortable.sortables[element.id]) return element;

 element = element.parentNode;

 }

 },

 options: function(element) {

 element = Sortable._findRootElement($(element));

 if(!element) return;

 return Sortable.sortables[element.id];

 },

 destroy: function(element){

 element = $(element);

 var s = Sortable.sortables[element.id];

 if(s) {

 Draggables.removeObserver(s.element);

 s.droppables.each(function(d){ Droppables.remove(d) });

 s.draggables.invoke('destroy');

 delete Sortable.sortables[s.element.id];

 }

 },

 create: function(element) {

 element = $(element);

 var options = Object.extend({

 element: element,

 tag: 'li', // assumes li children, override with tag: 'tagname'

 dropOnEmpty: false,

 tree: false,

 treeTag: 'ul',

 overlap: 'vertical', // one of 'vertical', 'horizontal'

 constraint: 'vertical', // one of 'vertical', 'horizontal', false

 containment: element, // also takes array of elements (or id's); or false

 handle: false, // or a CSS class

 only: false,

 delay: 0,

 hoverclass: null,

 ghosting: false,

 quiet: false,

 scroll: false,

 scrollSensitivity: 20,

 scrollSpeed: 15,

 format: this.SERIALIZE_RULE,

 // these take arrays of elements or ids and can be

 // used for better initialization performance

 elements: false,

 handles: false,

 onChange: Prototype.emptyFunction,

 onUpdate: Prototype.emptyFunction

 }, arguments[1] || { });

 // clear any old sortable with same element

 this.destroy(element);

 // build options for the draggables

 var options_for_draggable = {

 revert: true,

 quiet: options.quiet,

 scroll: options.scroll,

 scrollSpeed: options.scrollSpeed,

 scrollSensitivity: options.scrollSensitivity,

 delay: options.delay,

 ghosting: options.ghosting,

 constraint: options.constraint,

 handle: options.handle };

 if(options.starteffect)

 options_for_draggable.starteffect = options.starteffect;

 if(options.reverteffect)

 options_for_draggable.reverteffect = options.reverteffect;

 else

 if(options.ghosting) options_for_draggable.reverteffect = function(element) {

 element.style.top = 0;

 element.style.left = 0;

 };

 if(options.endeffect)

 options_for_draggable.endeffect = options.endeffect;

 if(options.zindex)

 options_for_draggable.zindex = options.zindex;

 // build options for the droppables

 var options_for_droppable = {

 overlap: options.overlap,

 containment: options.containment,

 tree: options.tree,

 hoverclass: options.hoverclass,

 onHover: Sortable.onHover

 };

 var options_for_tree = {

 onHover: Sortable.onEmptyHover,

 overlap: options.overlap,

 containment: options.containment,

 hoverclass: options.hoverclass

 };

 // fix for gecko engine

 Element.cleanWhitespace(element);

 options.draggables = [];

 options.droppables = [];

 // drop on empty handling

 if(options.dropOnEmpty || options.tree) {

 Droppables.add(element, options_for_tree);

 options.droppables.push(element);

 }

 (options.elements || this.findElements(element, options) || []).each( function(e,i) {

 var handle = options.handles ? $(options.handles[i]) :

 (options.handle ? $(e).select('.' + options.handle)[0] : e);

 options.draggables.push(

 new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));

 Droppables.add(e, options_for_droppable);

 if(options.tree) e.treeNode = element;

 options.droppables.push(e);

 });

 if(options.tree) {

 (Sortable.findTreeElements(element, options) || []).each( function(e) {

 Droppables.add(e, options_for_tree);

 e.treeNode = element;

 options.droppables.push(e);

 });

 }

 // keep reference

 this.sortables[element.identify()] = options;

 // for onupdate

 Draggables.addObserver(new SortableObserver(element, options.onUpdate));

 },

 // return all suitable-for-sortable elements in a guaranteed order

 findElements: function(element, options) {

 return Element.findChildren(

 element, options.only, options.tree ? true : false, options.tag);

 },

 findTreeElements: function(element, options) {

 return Element.findChildren(

 element, options.only, options.tree ? true : false, options.treeTag);

 },

 onHover: function(element, dropon, overlap) {

 if(Element.isParent(dropon, element)) return;

 if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {

 return;

 } else if(overlap>0.5) {

 Sortable.mark(dropon, 'before');

 if(dropon.previousSibling != element) {

 var oldParentNode = element.parentNode;

 element.style.visibility = "hidden"; // fix gecko rendering

 dropon.parentNode.insertBefore(element, dropon);

 if(dropon.parentNode!=oldParentNode)

 Sortable.options(oldParentNode).onChange(element);

 Sortable.options(dropon.parentNode).onChange(element);

 }

 } else {

 Sortable.mark(dropon, 'after');

 var nextElement = dropon.nextSibling || null;

 if(nextElement != element) {

 var oldParentNode = element.parentNode;

 element.style.visibility = "hidden"; // fix gecko rendering

 dropon.parentNode.insertBefore(element, nextElement);

 if(dropon.parentNode!=oldParentNode)

 Sortable.options(oldParentNode).onChange(element);

 Sortable.options(dropon.parentNode).onChange(element);

 }

 }

 },

 onEmptyHover: function(element, dropon, overlap) {

 var oldParentNode = element.parentNode;

 var droponOptions = Sortable.options(dropon);

 if(!Element.isParent(dropon, element)) {

 var index;

 var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});

 var child = null;

 if(children) {

 var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);

 for (index = 0; index < children.length; index += 1) {

 if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {

 offset -= Element.offsetSize (children[index], droponOptions.overlap);

 } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {

 child = index + 1 < children.length ? children[index + 1] : null;

 break;

 } else {

 child = children[index];

 break;

 }

 }

 }

 dropon.insertBefore(element, child);

 Sortable.options(oldParentNode).onChange(element);

 droponOptions.onChange(element);

 }

 },

 unmark: function() {

 if(Sortable._marker) Sortable._marker.hide();

 },

 mark: function(dropon, position) {

 // mark on ghosting only

 var sortable = Sortable.options(dropon.parentNode);

 if(sortable && !sortable.ghosting) return;

 if(!Sortable._marker) {

 Sortable._marker =

 ($('dropmarker') || Element.extend(document.createElement('DIV'))).

 hide().addClassName('dropmarker').setStyle({position:'absolute'});

 document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);

 }

 var offsets = dropon.cumulativeOffset();

 Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});

 if(position=='after')

 if(sortable.overlap == 'horizontal')

 Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});

 else

 Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});

 Sortable._marker.show();

 },

 _tree: function(element, options, parent) {

 var children = Sortable.findElements(element, options) || [];

 for (var i = 0; i < children.length; ++i) {

 var match = children[i].id.match(options.format);

 if (!match) continue;

 var child = {

 id: encodeURIComponent(match ? match[1] : null),

 element: element,

 parent: parent,

 children: [],

 position: parent.children.length,

 container: $(children[i]).down(options.treeTag)

 };

 /* Get the element containing the children and recurse over it */

 if (child.container)

 this._tree(child.container, options, child);

 parent.children.push (child);

 }

 return parent;

 },

 tree: function(element) {

 element = $(element);

 var sortableOptions = this.options(element);

 var options = Object.extend({

 tag: sortableOptions.tag,

 treeTag: sortableOptions.treeTag,

 only: sortableOptions.only,

 name: element.id,

 format: sortableOptions.format

 }, arguments[1] || { });

 var root = {

 id: null,

 parent: null,

 children: [],

 container: element,

 position: 0

 };

 return Sortable._tree(element, options, root);

 },

 /* Construct a [i] index for a particular node */

 _constructIndex: function(node) {

 var index = '';

 do {

 if (node.id) index = '[' + node.position + ']' + index;

 } while ((node = node.parent) != null);

 return index;

 },

 sequence: function(element) {

 element = $(element);

 var options = Object.extend(this.options(element), arguments[1] || { });

 return $(this.findElements(element, options) || []).map( function(item) {

 return item.id.match(options.format) ? item.id.match(options.format)[1] : '';

 });

 },

 setSequence: function(element, new_sequence) {

 element = $(element);

 var options = Object.extend(this.options(element), arguments[2] || { });

 var nodeMap = { };

 this.findElements(element, options).each( function(n) {

 if (n.id.match(options.format))

 nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];

 n.parentNode.removeChild(n);

 });

 new_sequence.each(function(ident) {

 var n = nodeMap[ident];

 if (n) {

 n[1].appendChild(n[0]);

 delete nodeMap[ident];

 }

 });

 },

 serialize: function(element) {

 element = $(element);

 var options = Object.extend(Sortable.options(element), arguments[1] || { });

 var name = encodeURIComponent(

 (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);

 if (options.tree) {

 return Sortable.tree(element, arguments[1]).children.map( function (item) {

 return [name + Sortable._constructIndex(item) + "[id]=" +

 encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));

 }).flatten().join('&');

 } else {

 return Sortable.sequence(element, arguments[1]).map( function(item) {

 return name + "[]=" + encodeURIComponent(item);

 }).join('&');

 }

 }

};

// Returns true if child is contained within element

Element.isParent = function(child, element) {

 if (!child.parentNode || child == element) return false;

 if (child.parentNode == element) return true;

 return Element.isParent(child.parentNode, element);

};

Element.findChildren = function(element, only, recursive, tagName) {

 if(!element.hasChildNodes()) return null;

 tagName = tagName.toUpperCase();

 if(only) only = [only].flatten();

 var elements = [];

 $A(element.childNodes).each( function(e) {

 if(e.tagName && e.tagName.toUpperCase()==tagName &&

 (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))

 elements.push(e);

 if(recursive) {

 var grandchildren = Element.findChildren(e, only, recursive, tagName);

 if(grandchildren) elements.push(grandchildren);

 }

 });

 return (elements.length>0 ? elements.flatten() : []);

};

Element.offsetSize = function (element, type) {

 return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];

};