root/js/dragdrop.js

// 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(pX, pY, 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, pX, pY) );
  },

  deactivate: function(drop) {
    if(drop.hoverclass)
      Element.removeClassName(drop.element, drop.hoverclass);
    this.last_active = null;
  },

  activate: function(drop) {
    if(this.last_active) this.deactivate(this.last_active);
    if(drop.hoverclass)
      Element.addClassName(drop.element, drop.hoverclass);
    this.last_active = drop;
  },

  show: function(event, element) {
    if(!this.drops.length) return;
    var pX = Event.pointerX(event);
    var pY = Event.pointerY(event);
    Position.prepare();

    var i = this.drops.length-1; do {
      var drop = this.drops[i];
      if(this.isAffected(pX, pY, element, drop)) {
        if(drop.onHover)
           drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
        if(drop.greedy) {
          this.activate(drop);
          return;
        }
      }
    } while (i--);

    if(this.last_active) this.deactivate(this.last_active);
  },

  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 = {
  observers: [],
  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;
        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
    }, 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.offsetX      = 0;
    this.offsetY      = 0;
    this.originalLeft = this.currentLeft();
    this.originalTop  = this.currentTop();
    this.originalX    = this.element.offsetLeft;
    this.originalY    = this.element.offsetTop;

    this.options      = options;

    this.active       = false;
    this.dragging     = false;

    this.eventMouseDown = this.startDrag.bindAsEventListener(this);
    this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
    this.eventMouseMove = this.update.bindAsEventListener(this);
    this.eventKeypress  = this.keyPress.bindAsEventListener(this);

    this.registerEvents();
  },
  destroy: function() {
    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
    this.unregisterEvents();
  },
  registerEvents: function() {
    Event.observe(document, "mouseup", this.eventMouseUp);
    Event.observe(document, "mousemove", this.eventMouseMove);
    Event.observe(document, "keypress", this.eventKeypress);
    Event.observe(this.handle, "mousedown", this.eventMouseDown);
  },
  unregisterEvents: function() {
    //if(!this.active) return;
    //Event.stopObserving(document, "mouseup", this.eventMouseUp);
    //Event.stopObserving(document, "mousemove", this.eventMouseMove);
    //Event.stopObserving(document, "keypress", this.eventKeypress);
  },
  currentLeft: function() {
    return parseInt(this.element.style.left || '0');
  },
  currentTop: function() {
    return parseInt(this.element.style.top || '0')
  },
  startDrag: 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;

      // this.registerEvents();
      this.active = true;
      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      var offsets = Position.cumulativeOffset(this.element);
      this.offsetX =  (pointer[0] - offsets[0]);
      this.offsetY =  (pointer[1] - offsets[1]);
      Event.stop(event);
    }
  },
  finishDrag: function(event, success) {
    // this.unregisterEvents();

    this.active = false;
    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);

    if(revert && this.options.reverteffect) {
      this.options.reverteffect(this.element,
      this.currentTop()-this.originalTop,
      this.currentLeft()-this.originalLeft);
    } else {
      this.originalLeft = this.currentLeft();
      this.originalTop  = this.currentTop();
    }

    if(this.options.zindex)
      this.element.style.zIndex = this.originalZ;

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


    Droppables.reset();
  },
  keyPress: function(event) {
    if(this.active) {
      if(event.keyCode==Event.KEY_ESC) {
        this.finishDrag(event, false);
        Event.stop(event);
      }
    }
  },
  endDrag: function(event) {
    if(this.active && this.dragging) {
      this.finishDrag(event, true);
      Event.stop(event);
    }
    this.active = false;
    this.dragging = false;
  },
  draw: function(event) {
    var pointer = [Event.pointerX(event), Event.pointerY(event)];
    var offsets = Position.cumulativeOffset(this.element);
    offsets[0] -= this.currentLeft();
    offsets[1] -= this.currentTop();
    var style = this.element.style;
    if((!this.options.constraint) || (this.options.constraint=='horizontal'))
      style.left = (pointer[0] - offsets[0] - this.offsetX) + "px";
    if((!this.options.constraint) || (this.options.constraint=='vertical'))
      style.top  = (pointer[1] - offsets[1] - this.offsetY) + "px";
    if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
  },
  update: function(event) {
   if(this.active) {
      if(!this.dragging) {
        var style = this.element.style;
        this.dragging = true;

        if(Element.getStyle(this.element,'position')=='')
          style.position = "relative";

        if(this.options.zindex) {
          this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
          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);
      }

      Droppables.show(event, this.element);
      Draggables.notify('onDrag', this, event);
      this.draw(event);
      if(this.options.change) this.options.change(this);

      // fix AppleWebKit rendering
      if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);

      Event.stop(event);
   }
  }
}

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

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==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) || []).collect( function(item) {
      return (encodeURIComponent(options.name) + "[]=" +
              encodeURIComponent(item.id.match(options.format) ? item.id.match(options.format)[1] : ''));
    }).join("&");
  }
}
1	dpavlin	83	// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
2	dpavlin	203	//
3			// See scriptaculous.js for full license.
4	dpavlin	83
5			/--------------------------------------------------------------------------/
6
7			var Droppables = {
8	dpavlin	203	drops: [],
9
10	dpavlin	83	remove: function(element) {
11	dpavlin	203	this.drops = this.drops.reject(function(d) { return d.element==element });
12	dpavlin	83	},
13	dpavlin	203
14	dpavlin	83	add: function(element) {
15	dpavlin	203	element = $(element);
16	dpavlin	83	var options = Object.extend({
17			greedy: true,
18	dpavlin	203	hoverclass: null
19	dpavlin	83	}, arguments[1] \|\| {});
20	dpavlin	203
21	dpavlin	83	// cache containers
22			if(options.containment) {
23	dpavlin	203	options._containers = [];
24	dpavlin	83	var containment = options.containment;
25	dpavlin	203	if((typeof containment == 'object') &&
26	dpavlin	83	(containment.constructor == Array)) {
27	dpavlin	203	containment.each( function(c) { options._containers.push($(c)) });
28	dpavlin	83	} else {
29			options._containers.push($(containment));
30			}
31			}
32	dpavlin	203
33			if(options.accept) options.accept = [options.accept].flatten();
34
35	dpavlin	83	Element.makePositioned(element); // fix IE
36			options.element = element;
37	dpavlin	203
38	dpavlin	83	this.drops.push(options);
39			},
40	dpavlin	203
41			isContained: function(element, drop) {
42	dpavlin	83	var parentNode = element.parentNode;
43	dpavlin	203	return drop._containers.detect(function(c) { return parentNode == c });
44	dpavlin	83	},
45	dpavlin	203
46			isAffected: function(pX, pY, element, drop) {
47	dpavlin	83	return (
48			(drop.element!=element) &&
49			((!drop._containers) \|\|
50	dpavlin	203	this.isContained(element, drop)) &&
51	dpavlin	83	((!drop.accept) \|\|
52	dpavlin	203	(Element.classNames(element).detect(
53			function(v) { return drop.accept.include(v) } ) )) &&
54	dpavlin	83	Position.within(drop.element, pX, pY) );
55			},
56	dpavlin	203
57	dpavlin	83	deactivate: function(drop) {
58	dpavlin	203	if(drop.hoverclass)
59			Element.removeClassName(drop.element, drop.hoverclass);
60	dpavlin	83	this.last_active = null;
61			},
62	dpavlin	203
63	dpavlin	83	activate: function(drop) {
64			if(this.last_active) this.deactivate(this.last_active);
65	dpavlin	203	if(drop.hoverclass)
66			Element.addClassName(drop.element, drop.hoverclass);
67			this.last_active = drop;
68	dpavlin	83	},
69	dpavlin	203
70	dpavlin	83	show: function(event, element) {
71	dpavlin	203	if(!this.drops.length) return;
72	dpavlin	83	var pX = Event.pointerX(event);
73			var pY = Event.pointerY(event);
74			Position.prepare();
75	dpavlin	203
76	dpavlin	83	var i = this.drops.length-1; do {
77			var drop = this.drops[i];
78	dpavlin	203	if(this.isAffected(pX, pY, element, drop)) {
79	dpavlin	83	if(drop.onHover)
80			drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
81	dpavlin	203	if(drop.greedy) {
82	dpavlin	83	this.activate(drop);
83			return;
84			}
85			}
86			} while (i--);
87	dpavlin	203
88			if(this.last_active) this.deactivate(this.last_active);
89	dpavlin	83	},
90	dpavlin	203
91	dpavlin	83	fire: function(event, element) {
92			if(!this.last_active) return;
93			Position.prepare();
94	dpavlin	203
95			if (this.isAffected(Event.pointerX(event), Event.pointerY(event), element, this.last_active))
96			if (this.last_active.onDrop)
97			this.last_active.onDrop(element, this.last_active.element, event);
98	dpavlin	83	},
99	dpavlin	203
100	dpavlin	83	reset: function() {
101			if(this.last_active)
102			this.deactivate(this.last_active);
103			}
104			}
105
106	dpavlin	203	var Draggables = {
107			observers: [],
108	dpavlin	83	addObserver: function(observer) {
109	dpavlin	203	this.observers.push(observer);
110			this._cacheObserverCallbacks();
111	dpavlin	83	},
112	dpavlin	203	removeObserver: function(element) { // element instead of observer fixes mem leaks
113			this.observers = this.observers.reject( function(o) { return o.element==element });
114			this._cacheObserverCallbacks();
115	dpavlin	83	},
116	dpavlin	203	notify: function(eventName, draggable, event) { // 'onStart', 'onEnd', 'onDrag'
117			if(this[eventName+'Count'] > 0)
118			this.observers.each( function(o) {
119			if(o[eventName]) o[eventName](eventName, draggable, event);
120			});
121			},
122			_cacheObserverCallbacks: function() {
123			['onStart','onEnd','onDrag'].each( function(eventName) {
124			Draggables[eventName+'Count'] = Draggables.observers.select(
125			function(o) { return o[eventName]; }
126			).length;
127			});
128	dpavlin	83	}
129			}
130
131			/--------------------------------------------------------------------------/
132
133	dpavlin	203	var Draggable = Class.create();
134	dpavlin	83	Draggable.prototype = {
135			initialize: function(element) {
136			var options = Object.extend({
137			handle: false,
138	dpavlin	203	starteffect: function(element) {
139			new Effect.Opacity(element, {duration:0.2, from:1.0, to:0.7});
140	dpavlin	83	},
141			reverteffect: function(element, top_offset, left_offset) {
142	dpavlin	203	var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
143			new Effect.MoveBy(element, -top_offset, -left_offset, {duration:dur});
144	dpavlin	83	},
145	dpavlin	203	endeffect: function(element) {
146			new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0});
147	dpavlin	83	},
148			zindex: 1000,
149			revert: false
150			}, arguments[1] \|\| {});
151	dpavlin	203
152	dpavlin	83	this.element = $(element);
153	dpavlin	203	if(options.handle && (typeof options.handle == 'string'))
154			this.handle = Element.childrenWithClassName(this.element, options.handle)[0];
155
156			if(!this.handle) this.handle = $(options.handle);
157			if(!this.handle) this.handle = this.element;
158
159	dpavlin	83	Element.makePositioned(this.element); // fix IE
160	dpavlin	203
161	dpavlin	83	this.offsetX = 0;
162			this.offsetY = 0;
163			this.originalLeft = this.currentLeft();
164			this.originalTop = this.currentTop();
165			this.originalX = this.element.offsetLeft;
166			this.originalY = this.element.offsetTop;
167	dpavlin	203
168	dpavlin	83	this.options = options;
169	dpavlin	203
170	dpavlin	83	this.active = false;
171	dpavlin	203	this.dragging = false;
172
173	dpavlin	83	this.eventMouseDown = this.startDrag.bindAsEventListener(this);
174			this.eventMouseUp = this.endDrag.bindAsEventListener(this);
175			this.eventMouseMove = this.update.bindAsEventListener(this);
176			this.eventKeypress = this.keyPress.bindAsEventListener(this);
177	dpavlin	203
178			this.registerEvents();
179			},
180			destroy: function() {
181			Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
182			this.unregisterEvents();
183			},
184			registerEvents: function() {
185	dpavlin	83	Event.observe(document, "mouseup", this.eventMouseUp);
186			Event.observe(document, "mousemove", this.eventMouseMove);
187			Event.observe(document, "keypress", this.eventKeypress);
188	dpavlin	203	Event.observe(this.handle, "mousedown", this.eventMouseDown);
189	dpavlin	83	},
190	dpavlin	203	unregisterEvents: function() {
191			//if(!this.active) return;
192			//Event.stopObserving(document, "mouseup", this.eventMouseUp);
193			//Event.stopObserving(document, "mousemove", this.eventMouseMove);
194			//Event.stopObserving(document, "keypress", this.eventKeypress);
195	dpavlin	83	},
196			currentLeft: function() {
197			return parseInt(this.element.style.left \|\| '0');
198			},
199			currentTop: function() {
200			return parseInt(this.element.style.top \|\| '0')
201			},
202			startDrag: function(event) {
203			if(Event.isLeftClick(event)) {
204	dpavlin	203
205			// abort on form elements, fixes a Firefox issue
206			var src = Event.element(event);
207			if(src.tagName && (
208			src.tagName=='INPUT' \|\|
209			src.tagName=='SELECT' \|\|
210			src.tagName=='BUTTON' \|\|
211			src.tagName=='TEXTAREA')) return;
212
213			// this.registerEvents();
214	dpavlin	83	this.active = true;
215	dpavlin	203	var pointer = [Event.pointerX(event), Event.pointerY(event)];
216			var offsets = Position.cumulativeOffset(this.element);
217			this.offsetX = (pointer[0] - offsets[0]);
218			this.offsetY = (pointer[1] - offsets[1]);
219	dpavlin	83	Event.stop(event);
220			}
221			},
222			finishDrag: function(event, success) {
223	dpavlin	203	// this.unregisterEvents();
224
225	dpavlin	83	this.active = false;
226			this.dragging = false;
227	dpavlin	203
228			if(this.options.ghosting) {
229			Position.relativize(this.element);
230			Element.remove(this._clone);
231			this._clone = null;
232			}
233
234	dpavlin	83	if(success) Droppables.fire(event, this.element);
235	dpavlin	203	Draggables.notify('onEnd', this, event);
236
237	dpavlin	83	var revert = this.options.revert;
238			if(revert && typeof revert == 'function') revert = revert(this.element);
239	dpavlin	203
240	dpavlin	83	if(revert && this.options.reverteffect) {
241	dpavlin	203	this.options.reverteffect(this.element,
242	dpavlin	83	this.currentTop()-this.originalTop,
243			this.currentLeft()-this.originalLeft);
244			} else {
245			this.originalLeft = this.currentLeft();
246			this.originalTop = this.currentTop();
247			}
248	dpavlin	203
249			if(this.options.zindex)
250			this.element.style.zIndex = this.originalZ;
251
252			if(this.options.endeffect)
253	dpavlin	83	this.options.endeffect(this.element);
254	dpavlin	203
255
256	dpavlin	83	Droppables.reset();
257			},
258			keyPress: function(event) {
259			if(this.active) {
260			if(event.keyCode==Event.KEY_ESC) {
261			this.finishDrag(event, false);
262			Event.stop(event);
263			}
264			}
265			},
266			endDrag: function(event) {
267			if(this.active && this.dragging) {
268			this.finishDrag(event, true);
269			Event.stop(event);
270			}
271			this.active = false;
272			this.dragging = false;
273			},
274			draw: function(event) {
275	dpavlin	203	var pointer = [Event.pointerX(event), Event.pointerY(event)];
276			var offsets = Position.cumulativeOffset(this.element);
277			offsets[0] -= this.currentLeft();
278			offsets[1] -= this.currentTop();
279	dpavlin	83	var style = this.element.style;
280			if((!this.options.constraint) \|\| (this.options.constraint=='horizontal'))
281	dpavlin	203	style.left = (pointer[0] - offsets[0] - this.offsetX) + "px";
282	dpavlin	83	if((!this.options.constraint) \|\| (this.options.constraint=='vertical'))
283	dpavlin	203	style.top = (pointer[1] - offsets[1] - this.offsetY) + "px";
284	dpavlin	83	if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
285			},
286			update: function(event) {
287			if(this.active) {
288			if(!this.dragging) {
289			var style = this.element.style;
290			this.dragging = true;
291	dpavlin	203
292			if(Element.getStyle(this.element,'position')=='')
293			style.position = "relative";
294
295			if(this.options.zindex) {
296			this.originalZ = parseInt(Element.getStyle(this.element,'z-index') \|\| 0);
297			style.zIndex = this.options.zindex;
298			}
299
300			if(this.options.ghosting) {
301			this._clone = this.element.cloneNode(true);
302			Position.absolutize(this.element);
303			this.element.parentNode.insertBefore(this._clone, this.element);
304			}
305
306			Draggables.notify('onStart', this, event);
307	dpavlin	83	if(this.options.starteffect) this.options.starteffect(this.element);
308			}
309	dpavlin	203
310	dpavlin	83	Droppables.show(event, this.element);
311	dpavlin	203	Draggables.notify('onDrag', this, event);
312	dpavlin	83	this.draw(event);
313			if(this.options.change) this.options.change(this);
314	dpavlin	203
315	dpavlin	83	// fix AppleWebKit rendering
316	dpavlin	203	if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
317
318	dpavlin	83	Event.stop(event);
319			}
320			}
321			}
322
323			/--------------------------------------------------------------------------/
324
325	dpavlin	203	var SortableObserver = Class.create();
326	dpavlin	83	SortableObserver.prototype = {
327			initialize: function(element, observer) {
328			this.element = $(element);
329			this.observer = observer;
330			this.lastValue = Sortable.serialize(this.element);
331			},
332			onStart: function() {
333			this.lastValue = Sortable.serialize(this.element);
334			},
335	dpavlin	203	onEnd: function() {
336			Sortable.unmark();
337	dpavlin	83	if(this.lastValue != Sortable.serialize(this.element))
338			this.observer(this.element)
339			}
340			}
341
342	dpavlin	203	var Sortable = {
343	dpavlin	83	sortables: new Array(),
344			options: function(element){
345	dpavlin	203	element = $(element);
346			return this.sortables.detect(function(s) { return s.element == element });
347	dpavlin	83	},
348			destroy: function(element){
349	dpavlin	203	element = $(element);
350			this.sortables.findAll(function(s) { return s.element == element }).each(function(s){
351			Draggables.removeObserver(s.element);
352			s.droppables.each(function(d){ Droppables.remove(d) });
353			s.draggables.invoke('destroy');
354			});
355			this.sortables = this.sortables.reject(function(s) { return s.element == element });
356	dpavlin	83	},
357			create: function(element) {
358	dpavlin	203	element = $(element);
359			var options = Object.extend({
360	dpavlin	83	element: element,
361			tag: 'li', // assumes li children, override with tag: 'tagname'
362	dpavlin	203	dropOnEmpty: false,
363			tree: false, // fixme: unimplemented
364	dpavlin	83	overlap: 'vertical', // one of 'vertical', 'horizontal'
365			constraint: 'vertical', // one of 'vertical', 'horizontal', false
366			containment: element, // also takes array of elements (or id's); or false
367			handle: false, // or a CSS class
368			only: false,
369			hoverclass: null,
370	dpavlin	203	ghosting: false,
371			format: null,
372			onChange: Prototype.emptyFunction,
373			onUpdate: Prototype.emptyFunction
374	dpavlin	83	}, arguments[1] \|\| {});
375	dpavlin	203
376	dpavlin	83	// clear any old sortable with same element
377			this.destroy(element);
378	dpavlin	203
379	dpavlin	83	// build options for the draggables
380			var options_for_draggable = {
381			revert: true,
382	dpavlin	203	ghosting: options.ghosting,
383	dpavlin	83	constraint: options.constraint,
384	dpavlin	203	handle: options.handle };
385
386	dpavlin	83	if(options.starteffect)
387			options_for_draggable.starteffect = options.starteffect;
388	dpavlin	203
389	dpavlin	83	if(options.reverteffect)
390			options_for_draggable.reverteffect = options.reverteffect;
391	dpavlin	203	else
392			if(options.ghosting) options_for_draggable.reverteffect = function(element) {
393			element.style.top = 0;
394			element.style.left = 0;
395			};
396
397	dpavlin	83	if(options.endeffect)
398			options_for_draggable.endeffect = options.endeffect;
399	dpavlin	203
400	dpavlin	83	if(options.zindex)
401			options_for_draggable.zindex = options.zindex;
402	dpavlin	203
403			// build options for the droppables
404	dpavlin	83	var options_for_droppable = {
405			overlap: options.overlap,
406			containment: options.containment,
407			hoverclass: options.hoverclass,
408	dpavlin	203	onHover: Sortable.onHover,
409			greedy: !options.dropOnEmpty
410	dpavlin	83	}
411
412			// fix for gecko engine
413	dpavlin	203	Element.cleanWhitespace(element);
414
415	dpavlin	83	options.draggables = [];
416			options.droppables = [];
417	dpavlin	203
418			// make it so
419
420			// drop on empty handling
421			if(options.dropOnEmpty) {
422			Droppables.add(element,
423			{containment: options.containment, onHover: Sortable.onEmptyHover, greedy: false});
424			options.droppables.push(element);
425			}
426
427			(this.findElements(element, options) \|\| []).each( function(e) {
428			// handles are per-draggable
429			var handle = options.handle ?
430			Element.childrenWithClassName(e, options.handle)[0] : e;
431			options.draggables.push(
432			new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
433			Droppables.add(e, options_for_droppable);
434			options.droppables.push(e);
435			});
436
437	dpavlin	83	// keep reference
438			this.sortables.push(options);
439	dpavlin	203
440	dpavlin	83	// for onupdate
441			Draggables.addObserver(new SortableObserver(element, options.onUpdate));
442
443			},
444	dpavlin	203
445			// return all suitable-for-sortable elements in a guaranteed order
446			findElements: function(element, options) {
447			if(!element.hasChildNodes()) return null;
448			var elements = [];
449			$A(element.childNodes).each( function(e) {
450			if(e.tagName && e.tagName==options.tag.toUpperCase() &&
451			(!options.only \|\| (Element.hasClassName(e, options.only))))
452			elements.push(e);
453			if(options.tree) {
454			var grandchildren = this.findElements(e, options);
455			if(grandchildren) elements.push(grandchildren);
456			}
457			});
458
459			return (elements.length>0 ? elements.flatten() : null);
460			},
461
462			onHover: function(element, dropon, overlap) {
463			if(overlap>0.5) {
464			Sortable.mark(dropon, 'before');
465			if(dropon.previousSibling != element) {
466			var oldParentNode = element.parentNode;
467			element.style.visibility = "hidden"; // fix gecko rendering
468			dropon.parentNode.insertBefore(element, dropon);
469			if(dropon.parentNode!=oldParentNode)
470			Sortable.options(oldParentNode).onChange(element);
471			Sortable.options(dropon.parentNode).onChange(element);
472			}
473			} else {
474			Sortable.mark(dropon, 'after');
475			var nextElement = dropon.nextSibling \|\| null;
476			if(nextElement != element) {
477			var oldParentNode = element.parentNode;
478			element.style.visibility = "hidden"; // fix gecko rendering
479			dropon.parentNode.insertBefore(element, nextElement);
480			if(dropon.parentNode!=oldParentNode)
481			Sortable.options(oldParentNode).onChange(element);
482			Sortable.options(dropon.parentNode).onChange(element);
483			}
484			}
485			},
486
487			onEmptyHover: function(element, dropon) {
488			if(element.parentNode!=dropon) {
489			var oldParentNode = element.parentNode;
490			dropon.appendChild(element);
491			Sortable.options(oldParentNode).onChange(element);
492			Sortable.options(dropon).onChange(element);
493			}
494			},
495
496			unmark: function() {
497			if(Sortable._marker) Element.hide(Sortable._marker);
498			},
499
500			mark: function(dropon, position) {
501			// mark on ghosting only
502			var sortable = Sortable.options(dropon.parentNode);
503			if(sortable && !sortable.ghosting) return;
504
505			if(!Sortable._marker) {
506			Sortable._marker = $('dropmarker') \|\| document.createElement('DIV');
507			Element.hide(Sortable._marker);
508			Element.addClassName(Sortable._marker, 'dropmarker');
509			Sortable._marker.style.position = 'absolute';
510			document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
511			}
512			var offsets = Position.cumulativeOffset(dropon);
513			Sortable._marker.style.left = offsets[0] + 'px';
514			Sortable._marker.style.top = offsets[1] + 'px';
515
516			if(position=='after')
517			if(sortable.overlap == 'horizontal')
518			Sortable._marker.style.left = (offsets[0]+dropon.clientWidth) + 'px';
519			else
520			Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
521
522			Element.show(Sortable._marker);
523			},
524
525	dpavlin	83	serialize: function(element) {
526	dpavlin	203	element = $(element);
527	dpavlin	83	var sortableOptions = this.options(element);
528			var options = Object.extend({
529			tag: sortableOptions.tag,
530			only: sortableOptions.only,
531	dpavlin	203	name: element.id,
532			format: sortableOptions.format \|\| /^[^_]_(.)$/
533	dpavlin	83	}, arguments[1] \|\| {});
534	dpavlin	203	return $(this.findElements(element, options) \|\| []).collect( function(item) {
535			return (encodeURIComponent(options.name) + "[]=" +
536			encodeURIComponent(item.id.match(options.format) ? item.id.match(options.format)[1] : ''));
537			}).join("&");
538	dpavlin	83	}
539	dpavlin	203	}