Update js library.

1 files changed, 584 insertions, 583 deletions

diff --git a/framework/Web/Javascripts/effects/dragdrop.js b/framework/Web/Javascripts/effects/dragdrop.js
index 5b4dc883..818ef5e0 100644
--- a/framework/Web/Javascripts/effects/dragdrop.js
+++ b/framework/Web/Javascripts/effects/dragdrop.js
@@ -1,584 +1,585 @@
-// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)

-// 

-// See scriptaculous.js for full license.

-

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

-

-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  

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

-

-    // cache containers

-    if(options.containment) {

-      options._containers = [];

-      var containment = options.containment;

-      if((typeof containment == 'object') && 

-        (containment.constructor == Array)) {

-        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);

-  },

-

-  isContained: function(element, drop) {

-    var parentNode = element.parentNode;

-    return drop._containers.detect(function(c) { return parentNode == 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;

-    

-    if(this.last_active) this.deactivate(this.last_active);

-    this.drops.each( function(drop) {

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

-        if(drop.onHover)

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

-        if(drop.greedy) { 

-          Droppables.activate(drop);

-		  //why throw an exception?

-          //throw $break;

-        }

-      }

-    });

-  },

-

-  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);

-  },

-

-  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) {

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

-    this.activeDraggable = draggable;

-  },

-  

-  deactivate: function(draggbale) {

-    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.activeDraggable) return;

-    this._lastPointer = null;

-    this.activeDraggable.endDrag(event);

-  },

-  

-  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);

-      });

-  },

-  

-  _cacheObserverCallbacks: function() {

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

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

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

-      ).length;

-    });

-  }

-}

-

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

-

-var Draggable = Class.create();

-Draggable.prototype = {

-  initialize: function(element) {

-	this.element = $(element);

-    var options = Object.extend({

-      handle: false,

-      starteffect: function(element) { 

-        new Effect.Opacity(element, {duration:0.2, from:1.0, to:0.7}); 

-      },

-      reverteffect: function(element, top_offset, left_offset) {

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

-        element._revert = new Effect.MoveBy(element, -top_offset, -left_offset, {duration:dur});

-      },

-      endeffect: function(element) { 

-        new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0}); 

-      },

-      zindex: 1000,

-      revert: false,

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

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

-    

-    if(options.handle && (typeof options.handle == 'string'))

-      this.handle = Element.childrenWithClassName(this.element, options.handle)[0];  

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

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

-

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

-

-    this.delta    = this.currentDelta();

-    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(this.element.style.left || '0'),

-      parseInt(this.element.style.top || '0')]);

-  },

-  

-  initDrag: function(event) {

-    if(Event.isLeftClick(event)) {    

-      // abort on form elements, fixes a Firefox issue

-      var src = Event.element(event);

-      if(src.tagName && (

-        src.tagName=='INPUT' ||

-        src.tagName=='SELECT' ||

-        src.tagName=='BUTTON' ||

-        src.tagName=='TEXTAREA')) return;

-        

-      if(this.element._revert) {

-        this.element._revert.cancel();

-        this.element._revert = null;

-      }

-      

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

-      var pos     = Position.cumulativeOffset(this.element);

-      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.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);

-      Position.absolutize(this.element);

-      this.element.parentNode.insertBefore(this._clone, this.element);

-    }

-    

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

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

-  },

-  

-  updateDrag: function(event, pointer) {

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

-    Position.prepare();

-    Droppables.show(pointer, this.element);

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

-    this.draw(pointer);

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

-    

-    // fix AppleWebKit rendering

-    if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);

-    Event.stop(event);

-  },

-  

-  finishDrag: function(event, success) {

-    this.dragging = false;

-

-    if(this.options.ghosting) {

-      Position.relativize(this.element);

-      Element.remove(this._clone);

-      this._clone = null;

-    }

-

-    if(success) Droppables.fire(event, this.element);

-    Draggables.notify('onEnd', 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.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.finishDrag(event, true);

-    Event.stop(event);

-  },

-  

-  draw: function(point) {

-    var pos = Position.cumulativeOffset(this.element);

-    var d = this.currentDelta();

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

-    

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

-    

-    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) {

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

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

-      } else {

-        p = p.map( function(v) {

-          return Math.round(v/this.options.snap)*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

-  }

-}

-

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

-

-var SortableObserver = Class.create();

-SortableObserver.prototype = {

-  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 = {

-  sortables: new Array(),

-  

-  options: function(element){

-    element = $(element);

-    return this.sortables.detect(function(s) { return s.element == element });

-  },

-  

-  destroy: function(element){

-    element = $(element);

-    this.sortables.findAll(function(s) { return s.element == element }).each(function(s){

-      Draggables.removeObserver(s.element);

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

-      s.draggables.invoke('destroy');

-    });

-    this.sortables = this.sortables.reject(function(s) { return s.element == element });

-  },

-  

-  create: function(element) {

-    element = $(element);

-    var options = Object.extend({ 

-      element:     element,

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

-      dropOnEmpty: false,

-      tree:        false,      // fixme: unimplemented

-      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,

-      hoverclass:  null,

-      ghosting:    false,

-      format:      null,

-      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,

-      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,

-      hoverclass:  options.hoverclass,

-      onHover:     Sortable.onHover,

-      greedy:      !options.dropOnEmpty

-    }

-

-    // fix for gecko engine

-    Element.cleanWhitespace(element); 

-

-    options.draggables = [];

-    options.droppables = [];

-

-    // make it so

-

-    // drop on empty handling

-    if(options.dropOnEmpty) {

-      Droppables.add(element,

-        {containment: options.containment, onHover: Sortable.onEmptyHover, greedy: false});

-      options.droppables.push(element);

-    }

-

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

-      // handles are per-draggable

-      var handle = options.handle ? 

-        Element.childrenWithClassName(e, options.handle)[0] : e;    

-      options.draggables.push(

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

-      Droppables.add(e, options_for_droppable);

-      options.droppables.push(e);      

-    });

-

-    // keep reference

-    this.sortables.push(options);

-

-    // for onupdate

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

-

-  },

-

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

-  findElements: function(element, options) {

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

-    var elements = [];

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

-      if(e.tagName && e.tagName.toUpperCase()==options.tag.toUpperCase() &&

-        (!options.only || (Element.hasClassName(e, options.only))))

-          elements.push(e);

-      if(options.tree) {

-        var grandchildren = this.findElements(e, options);

-        if(grandchildren) elements.push(grandchildren);

-      }

-    });

-

-    return (elements.length>0 ? elements.flatten() : null);

-  },

-

-  onHover: function(element, dropon, overlap) {

-    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) {

-    if(element.parentNode!=dropon) {

-      var oldParentNode = element.parentNode;

-      dropon.appendChild(element);

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

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

-    }

-  },

-

-  unmark: function() {

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

-  },

-

-  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') || document.createElement('DIV');

-      Element.hide(Sortable._marker);

-      Element.addClassName(Sortable._marker, 'dropmarker');

-      Sortable._marker.style.position = 'absolute';

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

-    }    

-    var offsets = Position.cumulativeOffset(dropon);

-    Sortable._marker.style.left = offsets[0] + 'px';

-    Sortable._marker.style.top = offsets[1] + 'px';

-    

-    if(position=='after')

-      if(sortable.overlap == 'horizontal') 

-        Sortable._marker.style.left = (offsets[0]+dropon.clientWidth) + 'px';

-      else

-        Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';

-    

-    Element.show(Sortable._marker);

-  },

-

-  serialize: function(element) {

-    element = $(element);

-    var sortableOptions = this.options(element);

-    var options = Object.extend({

-      tag:  sortableOptions.tag,

-      only: sortableOptions.only,

-      name: element.id,

-      format: sortableOptions.format || /^[^_]*_(.*)$/

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

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

-      return (encodeURIComponent(options.name) + "[]=" + 

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

-    }).join("&");

-  }

+// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
+// 
+// See scriptaculous.js for full license.
+
+/*--------------------------------------------------------------------------*/
+
+var Droppables = {
+  drops: [],
+
+  remove: function(element) {
+    this.drops = this.drops.reject(function(d) { return d.element==$(element) });
+  },
+
+  add: function(element) {
+    element = $(element);
+    var options = Object.extend({
+      greedy:     true,
+      hoverclass: null  
+    }, arguments[1] || {});
+
+    // cache containers
+    if(options.containment) {
+      options._containers = [];
+      var containment = options.containment;
+      if((typeof containment == 'object') && 
+        (containment.constructor == Array)) {
+        containment.each( function(c) { options._containers.push($(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);
+  },
+
+  isContained: function(element, drop) {
+    var parentNode = element.parentNode;
+    return drop._containers.detect(function(c) { return parentNode == 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;
+    
+    if(this.last_active) this.deactivate(this.last_active);
+    this.drops.each( function(drop) {
+      if(Droppables.isAffected(point, element, drop)) {
+        if(drop.onHover)
+           drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
+        if(drop.greedy) { 
+          Droppables.activate(drop);
+          throw $break;
+        }
+      }
+    });
+  },
+
+  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);
+  },
+
+  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) {
+    window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
+    this.activeDraggable = draggable;
+  },
+  
+  deactivate: function(draggbale) {
+    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.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);
+      });
+  },
+  
+  _cacheObserverCallbacks: function() {
+    ['onStart','onEnd','onDrag'].each( function(eventName) {
+      Draggables[eventName+'Count'] = Draggables.observers.select(
+        function(o) { return o[eventName]; }
+      ).length;
+    });
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+var Draggable = Class.create();
+Draggable.prototype = {
+  initialize: function(element) {
+    var options = Object.extend({
+      handle: false,
+      starteffect: function(element) { 
+        new Effect.Opacity(element, {duration:0.2, from:1.0, to:0.7}); 
+      },
+      reverteffect: function(element, top_offset, left_offset) {
+        var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
+        element._revert = new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur});
+      },
+      endeffect: function(element) { 
+        new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0}); 
+      },
+      zindex: 1000,
+      revert: false,
+      snap: false   // false, or xy or [x,y] or function(x,y){ return [x,y] }
+    }, arguments[1] || {});
+
+    this.element = $(element);
+    
+    if(options.handle && (typeof options.handle == 'string'))
+      this.handle = Element.childrenWithClassName(this.element, options.handle)[0];  
+    if(!this.handle) this.handle = $(options.handle);
+    if(!this.handle) this.handle = this.element;
+
+    Element.makePositioned(this.element); // fix IE    
+
+    this.delta    = this.currentDelta();
+    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(Event.isLeftClick(event)) {    
+      // abort on form elements, fixes a Firefox issue
+      var src = Event.element(event);
+      if(src.tagName && (
+        src.tagName=='INPUT' ||
+        src.tagName=='SELECT' ||
+        src.tagName=='BUTTON' ||
+        src.tagName=='TEXTAREA')) return;
+        
+      if(this.element._revert) {
+        this.element._revert.cancel();
+        this.element._revert = null;
+      }
+      
+      var pointer = [Event.pointerX(event), Event.pointerY(event)];
+      var pos     = Position.cumulativeOffset(this.element);
+      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.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);
+      Position.absolutize(this.element);
+      this.element.parentNode.insertBefore(this._clone, this.element);
+    }
+    
+    Draggables.notify('onStart', this, event);
+    if(this.options.starteffect) this.options.starteffect(this.element);
+  },
+  
+  updateDrag: function(event, pointer) {
+    if(!this.dragging) this.startDrag(event);
+    Position.prepare();
+    Droppables.show(pointer, this.element);
+    Draggables.notify('onDrag', this, event);
+    this.draw(pointer);
+    if(this.options.change) this.options.change(this);
+    
+    // fix AppleWebKit rendering
+    if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
+    Event.stop(event);
+  },
+  
+  finishDrag: function(event, success) {
+    this.dragging = false;
+
+    if(this.options.ghosting) {
+      Position.relativize(this.element);
+      Element.remove(this._clone);
+      this._clone = null;
+    }
+
+    if(success) Droppables.fire(event, this.element);
+    Draggables.notify('onEnd', 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.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.finishDrag(event, true);
+    Event.stop(event);
+  },
+  
+  draw: function(point) {
+    var pos = Position.cumulativeOffset(this.element);
+    var d = this.currentDelta();
+    pos[0] -= d[0]; pos[1] -= d[1];
+    
+    var p = [0,1].map(function(i){ return (point[i]-pos[i]-this.offset[i]) }.bind(this));
+    
+    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) {
+        p = p.map( function(v, i) {
+          return Math.round(v/this.options.snap[i])*this.options.snap[i] }.bind(this))
+      } else {
+        p = p.map( function(v) {
+          return Math.round(v/this.options.snap)*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
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+var SortableObserver = Class.create();
+SortableObserver.prototype = {
+  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 = {
+  sortables: new Array(),
+  
+  options: function(element){
+    element = $(element);
+    return this.sortables.detect(function(s) { return s.element == element });
+  },
+  
+  destroy: function(element){
+    element = $(element);
+    this.sortables.findAll(function(s) { return s.element == element }).each(function(s){
+      Draggables.removeObserver(s.element);
+      s.droppables.each(function(d){ Droppables.remove(d) });
+      s.draggables.invoke('destroy');
+    });
+    this.sortables = this.sortables.reject(function(s) { return s.element == element });
+  },
+  
+  create: function(element) {
+    element = $(element);
+    var options = Object.extend({ 
+      element:     element,
+      tag:         'li',       // assumes li children, override with tag: 'tagname'
+      dropOnEmpty: false,
+      tree:        false,      // fixme: unimplemented
+      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,
+      hoverclass:  null,
+      ghosting:    false,
+      format:      null,
+      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,
+      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,
+      hoverclass:  options.hoverclass,
+      onHover:     Sortable.onHover,
+      greedy:      !options.dropOnEmpty
+    }
+
+    // fix for gecko engine
+    Element.cleanWhitespace(element); 
+
+    options.draggables = [];
+    options.droppables = [];
+
+    // make it so
+
+    // drop on empty handling
+    if(options.dropOnEmpty) {
+      Droppables.add(element,
+        {containment: options.containment, onHover: Sortable.onEmptyHover, greedy: false});
+      options.droppables.push(element);
+    }
+
+    (this.findElements(element, options) || []).each( function(e) {
+      // handles are per-draggable
+      var handle = options.handle ? 
+        Element.childrenWithClassName(e, options.handle)[0] : e;    
+      options.draggables.push(
+        new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
+      Droppables.add(e, options_for_droppable);
+      options.droppables.push(e);      
+    });
+
+    // keep reference
+    this.sortables.push(options);
+
+    // for onupdate
+    Draggables.addObserver(new SortableObserver(element, options.onUpdate));
+
+  },
+
+  // return all suitable-for-sortable elements in a guaranteed order
+  findElements: function(element, options) {
+    if(!element.hasChildNodes()) return null;
+    var elements = [];
+    $A(element.childNodes).each( function(e) {
+      if(e.tagName && e.tagName.toUpperCase()==options.tag.toUpperCase() &&
+        (!options.only || (Element.hasClassName(e, options.only))))
+          elements.push(e);
+      if(options.tree) {
+        var grandchildren = this.findElements(e, options);
+        if(grandchildren) elements.push(grandchildren);
+      }
+    });
+
+    return (elements.length>0 ? elements.flatten() : null);
+  },
+
+  onHover: function(element, dropon, overlap) {
+    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) {
+    if(element.parentNode!=dropon) {
+      var oldParentNode = element.parentNode;
+      dropon.appendChild(element);
+      Sortable.options(oldParentNode).onChange(element);
+      Sortable.options(dropon).onChange(element);
+    }
+  },
+
+  unmark: function() {
+    if(Sortable._marker) Element.hide(Sortable._marker);
+  },
+
+  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') || document.createElement('DIV');
+      Element.hide(Sortable._marker);
+      Element.addClassName(Sortable._marker, 'dropmarker');
+      Sortable._marker.style.position = 'absolute';
+      document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
+    }    
+    var offsets = Position.cumulativeOffset(dropon);
+    Sortable._marker.style.left = offsets[0] + 'px';
+    Sortable._marker.style.top = offsets[1] + 'px';
+    
+    if(position=='after')
+      if(sortable.overlap == 'horizontal') 
+        Sortable._marker.style.left = (offsets[0]+dropon.clientWidth) + 'px';
+      else
+        Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
+    
+    Element.show(Sortable._marker);
+  },
+
+  serialize: function(element) {
+    element = $(element);
+    var sortableOptions = this.options(element);
+    var options = Object.extend({
+      tag:  sortableOptions.tag,
+      only: sortableOptions.only,
+      name: element.id,
+      format: sortableOptions.format || /^[^_]*_(.*)$/
+    }, arguments[1] || {});
+    return $(this.findElements(element, options) || []).map( function(item) {
+      return (encodeURIComponent(options.name) + "[]=" + 
+              encodeURIComponent(item.id.match(options.format) ? item.id.match(options.format)[1] : ''));
+    }).join("&");
+  }
 }
\ No newline at end of file