source: branches/1.2/workflow/js/scriptaculous/dragdrop.js @ 1349

Revision 1349, 29.9 KB checked in by niltonneto, 15 years ago (diff)

Ticket #561 - Inclusão do módulo Workflow faltante nessa versão.

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1// script.aculo.us dragdrop.js v1.6.5, Wed Nov 08 14:17:49 CET 2006
2
3// Copyright (c) 2005, 2006 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
4//           (c) 2005, 2006 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
5//
6// script.aculo.us is freely distributable under the terms of an MIT-style license.
7// For details, see the script.aculo.us web site: http://script.aculo.us/
8
9if(typeof Effect == 'undefined')
10  throw("dragdrop.js requires including script.aculo.us' effects.js library");
11
12var Droppables = {
13  drops: [],
14
15  remove: function(element) {
16    this.drops = this.drops.reject(function(d) { return d.element==$(element) });
17  },
18
19  add: function(element) {
20    element = $(element);
21    var options = Object.extend({
22      greedy:     true,
23      hoverclass: null,
24      tree:       false
25    }, arguments[1] || {});
26
27    // cache containers
28    if(options.containment) {
29      options._containers = [];
30      var containment = options.containment;
31      if((typeof containment == 'object') &&
32        (containment.constructor == Array)) {
33        containment.each( function(c) { options._containers.push($(c)) });
34      } else {
35        options._containers.push($(containment));
36      }
37    }
38   
39    if(options.accept) options.accept = [options.accept].flatten();
40
41    Element.makePositioned(element); // fix IE
42    options.element = element;
43
44    this.drops.push(options);
45  },
46 
47  findDeepestChild: function(drops) {
48    deepest = drops[0];
49     
50    for (i = 1; i < drops.length; ++i)
51      if (Element.isParent(drops[i].element, deepest.element))
52        deepest = drops[i];
53   
54    return deepest;
55  },
56
57  isContained: function(element, drop) {
58    var containmentNode;
59    if(drop.tree) {
60      containmentNode = element.treeNode;
61    } else {
62      containmentNode = element.parentNode;
63    }
64    return drop._containers.detect(function(c) { return containmentNode == c });
65  },
66 
67  isAffected: function(point, element, drop) {
68    return (
69      (drop.element!=element) &&
70      ((!drop._containers) ||
71        this.isContained(element, drop)) &&
72      ((!drop.accept) ||
73        (Element.classNames(element).detect(
74          function(v) { return drop.accept.include(v) } ) )) &&
75      Position.within(drop.element, point[0], point[1]) );
76  },
77
78  deactivate: function(drop) {
79    if(drop.hoverclass)
80      Element.removeClassName(drop.element, drop.hoverclass);
81    this.last_active = null;
82  },
83
84  activate: function(drop) {
85    if(drop.hoverclass)
86      Element.addClassName(drop.element, drop.hoverclass);
87    this.last_active = drop;
88  },
89
90  show: function(point, element) {
91    if(!this.drops.length) return;
92    var affected = [];
93   
94    if(this.last_active) this.deactivate(this.last_active);
95    this.drops.each( function(drop) {
96      if(Droppables.isAffected(point, element, drop))
97        affected.push(drop);
98    });
99       
100    if(affected.length>0) {
101      drop = Droppables.findDeepestChild(affected);
102      Position.within(drop.element, point[0], point[1]);
103      if(drop.onHover)
104        drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
105     
106      Droppables.activate(drop);
107    }
108  },
109
110  fire: function(event, element) {
111    if(!this.last_active) return;
112    Position.prepare();
113
114    if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
115      if (this.last_active.onDrop)
116        this.last_active.onDrop(element, this.last_active.element, event);
117  },
118
119  reset: function() {
120    if(this.last_active)
121      this.deactivate(this.last_active);
122  }
123};
124
125var Draggables = {
126  drags: [],
127  observers: [],
128 
129  register: function(draggable) {
130    if(this.drags.length == 0) {
131      this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
132      this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
133      this.eventKeypress  = this.keyPress.bindAsEventListener(this);
134     
135      Event.observe(document, "mouseup", this.eventMouseUp);
136      Event.observe(document, "mousemove", this.eventMouseMove);
137      Event.observe(document, "keypress", this.eventKeypress);
138    }
139    this.drags.push(draggable);
140  },
141 
142  unregister: function(draggable) {
143    this.drags = this.drags.reject(function(d) { return d==draggable });
144    if(this.drags.length == 0) {
145      Event.stopObserving(document, "mouseup", this.eventMouseUp);
146      Event.stopObserving(document, "mousemove", this.eventMouseMove);
147      Event.stopObserving(document, "keypress", this.eventKeypress);
148    }
149  },
150 
151  activate: function(draggable) {
152    if(draggable.options.delay) {
153      this._timeout = setTimeout(function() {
154        Draggables._timeout = null;
155        window.focus();
156        Draggables.activeDraggable = draggable;
157      }.bind(this), draggable.options.delay);
158    } else {
159      window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
160      this.activeDraggable = draggable;
161    }
162  },
163 
164  deactivate: function() {
165    this.activeDraggable = null;
166  },
167 
168  updateDrag: function(event) {
169    if(!this.activeDraggable) return;
170    var pointer = [Event.pointerX(event), Event.pointerY(event)];
171    // Mozilla-based browsers fire successive mousemove events with
172    // the same coordinates, prevent needless redrawing (moz bug?)
173    if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
174    this._lastPointer = pointer;
175   
176    this.activeDraggable.updateDrag(event, pointer);
177  },
178 
179  endDrag: function(event) {
180    if(this._timeout) {
181      clearTimeout(this._timeout);
182      this._timeout = null;
183    }
184    if(!this.activeDraggable) return;
185    this._lastPointer = null;
186    this.activeDraggable.endDrag(event);
187    this.activeDraggable = null;
188  },
189 
190  keyPress: function(event) {
191    if(this.activeDraggable)
192      this.activeDraggable.keyPress(event);
193  },
194 
195  addObserver: function(observer) {
196    this.observers.push(observer);
197    this._cacheObserverCallbacks();
198  },
199 
200  removeObserver: function(element) {  // element instead of observer fixes mem leaks
201    this.observers = this.observers.reject( function(o) { return o.element==element });
202    this._cacheObserverCallbacks();
203  },
204 
205  notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
206    if(this[eventName+'Count'] > 0)
207      this.observers.each( function(o) {
208        if(o[eventName]) o[eventName](eventName, draggable, event);
209      });
210    if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
211  },
212 
213  _cacheObserverCallbacks: function() {
214    ['onStart','onEnd','onDrag'].each( function(eventName) {
215      Draggables[eventName+'Count'] = Draggables.observers.select(
216        function(o) { return o[eventName]; }
217      ).length;
218    });
219  }
220};
221
222/*--------------------------------------------------------------------------*/
223
224var Draggable = Class.create();
225Draggable._dragging    = {};
226
227Draggable.prototype = {
228  initialize: function(element) {
229    var defaults = {
230      handle: false,
231      reverteffect: function(element, top_offset, left_offset) {
232        var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
233        new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
234          queue: {scope:'_draggable', position:'end'}
235        });
236      },
237      endeffect: function(element) {
238        var toOpacity = typeof element._opacity == 'number' ? element._opacity : 1.0;
239        new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity,
240          queue: {scope:'_draggable', position:'end'},
241          afterFinish: function(){
242            Draggable._dragging[element] = false
243          }
244        });
245      },
246      zindex: 1000,
247      revert: false,
248      scroll: false,
249      scrollSensitivity: 20,
250      scrollSpeed: 15,
251      snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }
252      delay: 0
253    };
254   
255    if(!arguments[1] || typeof arguments[1].endeffect == 'undefined')
256      Object.extend(defaults, {
257        starteffect: function(element) {
258          element._opacity = Element.getOpacity(element);
259          Draggable._dragging[element] = true;
260          new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});
261        }
262      });
263   
264    var options = Object.extend(defaults, arguments[1] || {});
265
266    this.element = $(element);
267   
268    if(options.handle && (typeof options.handle == 'string'))
269      this.handle = this.element.down('.'+options.handle, 0);
270   
271    if(!this.handle) this.handle = $(options.handle);
272    if(!this.handle) this.handle = this.element;
273   
274    if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
275      options.scroll = $(options.scroll);
276      this._isScrollChild = Element.childOf(this.element, options.scroll);
277    }
278
279    Element.makePositioned(this.element); // fix IE   
280
281    this.delta    = this.currentDelta();
282    this.options  = options;
283    this.dragging = false;   
284
285    this.eventMouseDown = this.initDrag.bindAsEventListener(this);
286    Event.observe(this.handle, "mousedown", this.eventMouseDown);
287   
288    Draggables.register(this);
289  },
290 
291  destroy: function() {
292    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
293    Draggables.unregister(this);
294  },
295 
296  currentDelta: function() {
297    return([
298      parseInt(Element.getStyle(this.element,'left') || '0'),
299      parseInt(Element.getStyle(this.element,'top') || '0')]);
300  },
301 
302  initDrag: function(event) {
303    if(typeof Draggable._dragging[this.element] != 'undefined' &&
304      Draggable._dragging[this.element]) return;
305    if(Event.isLeftClick(event)) {   
306      // abort on form elements, fixes a Firefox issue
307      var src = Event.element(event);
308      if(src.tagName && (
309        src.tagName=='INPUT' ||
310        src.tagName=='SELECT' ||
311        src.tagName=='OPTION' ||
312        src.tagName=='BUTTON' ||
313        src.tagName=='TEXTAREA')) return;
314       
315      var pointer = [Event.pointerX(event), Event.pointerY(event)];
316      var pos     = Position.cumulativeOffset(this.element);
317      this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
318     
319      Draggables.activate(this);
320      Event.stop(event);
321    }
322  },
323 
324  startDrag: function(event) {
325    this.dragging = true;
326   
327    if(this.options.zindex) {
328      this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
329      this.element.style.zIndex = this.options.zindex;
330    }
331   
332    if(this.options.ghosting) {
333      this._clone = this.element.cloneNode(true);
334      Position.absolutize(this.element);
335      this.element.parentNode.insertBefore(this._clone, this.element);
336    }
337   
338    if(this.options.scroll) {
339      if (this.options.scroll == window) {
340        var where = this._getWindowScroll(this.options.scroll);
341        this.originalScrollLeft = where.left;
342        this.originalScrollTop = where.top;
343      } else {
344        this.originalScrollLeft = this.options.scroll.scrollLeft;
345        this.originalScrollTop = this.options.scroll.scrollTop;
346      }
347    }
348   
349    Draggables.notify('onStart', this, event);
350       
351    if(this.options.starteffect) this.options.starteffect(this.element);
352  },
353 
354  updateDrag: function(event, pointer) {
355    if(!this.dragging) this.startDrag(event);
356    Position.prepare();
357    Droppables.show(pointer, this.element);
358    Draggables.notify('onDrag', this, event);
359   
360    this.draw(pointer);
361    if(this.options.change) this.options.change(this);
362   
363    if(this.options.scroll) {
364      this.stopScrolling();
365     
366      var p;
367      if (this.options.scroll == window) {
368        with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
369      } else {
370        p = Position.page(this.options.scroll);
371        p[0] += this.options.scroll.scrollLeft + Position.deltaX;
372        p[1] += this.options.scroll.scrollTop + Position.deltaY;
373        p.push(p[0]+this.options.scroll.offsetWidth);
374        p.push(p[1]+this.options.scroll.offsetHeight);
375      }
376      var speed = [0,0];
377      if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
378      if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
379      if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
380      if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
381      this.startScrolling(speed);
382    }
383   
384    // fix AppleWebKit rendering
385    if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
386   
387    Event.stop(event);
388  },
389 
390  finishDrag: function(event, success) {
391    this.dragging = false;
392
393    if(this.options.ghosting) {
394      Position.relativize(this.element);
395      Element.remove(this._clone);
396      this._clone = null;
397    }
398
399    if(success) Droppables.fire(event, this.element);
400    Draggables.notify('onEnd', this, event);
401
402    var revert = this.options.revert;
403    if(revert && typeof revert == 'function') revert = revert(this.element);
404   
405    var d = this.currentDelta();
406    if(revert && this.options.reverteffect) {
407      this.options.reverteffect(this.element,
408        d[1]-this.delta[1], d[0]-this.delta[0]);
409    } else {
410      this.delta = d;
411    }
412
413    if(this.options.zindex)
414      this.element.style.zIndex = this.originalZ;
415
416    if(this.options.endeffect)
417      this.options.endeffect(this.element);
418     
419    Draggables.deactivate(this);
420    Droppables.reset();
421  },
422 
423  keyPress: function(event) {
424    if(event.keyCode!=Event.KEY_ESC) return;
425    this.finishDrag(event, false);
426    Event.stop(event);
427  },
428 
429  endDrag: function(event) {
430    if(!this.dragging) return;
431    this.stopScrolling();
432    this.finishDrag(event, true);
433    Event.stop(event);
434  },
435 
436  draw: function(point) {
437    var pos = Position.cumulativeOffset(this.element);
438    if(this.options.ghosting) {
439      var r   = Position.realOffset(this.element);
440      pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
441    }
442   
443    var d = this.currentDelta();
444    pos[0] -= d[0]; pos[1] -= d[1];
445   
446    if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
447      pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
448      pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
449    }
450   
451    var p = [0,1].map(function(i){
452      return (point[i]-pos[i]-this.offset[i])
453    }.bind(this));
454   
455    if(this.options.snap) {
456      if(typeof this.options.snap == 'function') {
457        p = this.options.snap(p[0],p[1],this);
458      } else {
459      if(this.options.snap instanceof Array) {
460        p = p.map( function(v, i) {
461          return Math.round(v/this.options.snap[i])*this.options.snap[i] }.bind(this))
462      } else {
463        p = p.map( function(v) {
464          return Math.round(v/this.options.snap)*this.options.snap }.bind(this))
465      }
466    }}
467   
468    var style = this.element.style;
469    if((!this.options.constraint) || (this.options.constraint=='horizontal'))
470      style.left = p[0] + "px";
471    if((!this.options.constraint) || (this.options.constraint=='vertical'))
472      style.top  = p[1] + "px";
473   
474    if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
475  },
476 
477  stopScrolling: function() {
478    if(this.scrollInterval) {
479      clearInterval(this.scrollInterval);
480      this.scrollInterval = null;
481      Draggables._lastScrollPointer = null;
482    }
483  },
484 
485  startScrolling: function(speed) {
486    if(!(speed[0] || speed[1])) return;
487    this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
488    this.lastScrolled = new Date();
489    this.scrollInterval = setInterval(this.scroll.bind(this), 10);
490  },
491 
492  scroll: function() {
493    var current = new Date();
494    var delta = current - this.lastScrolled;
495    this.lastScrolled = current;
496    if(this.options.scroll == window) {
497      with (this._getWindowScroll(this.options.scroll)) {
498        if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
499          var d = delta / 1000;
500          this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
501        }
502      }
503    } else {
504      this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
505      this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
506    }
507   
508    Position.prepare();
509    Droppables.show(Draggables._lastPointer, this.element);
510    Draggables.notify('onDrag', this);
511    if (this._isScrollChild) {
512      Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
513      Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
514      Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
515      if (Draggables._lastScrollPointer[0] < 0)
516        Draggables._lastScrollPointer[0] = 0;
517      if (Draggables._lastScrollPointer[1] < 0)
518        Draggables._lastScrollPointer[1] = 0;
519      this.draw(Draggables._lastScrollPointer);
520    }
521   
522    if(this.options.change) this.options.change(this);
523  },
524 
525  _getWindowScroll: function(w) {
526    var T, L, W, H;
527    with (w.document) {
528      if (w.document.documentElement && documentElement.scrollTop) {
529        T = documentElement.scrollTop;
530        L = documentElement.scrollLeft;
531      } else if (w.document.body) {
532        T = body.scrollTop;
533        L = body.scrollLeft;
534      }
535      if (w.innerWidth) {
536        W = w.innerWidth;
537        H = w.innerHeight;
538      } else if (w.document.documentElement && documentElement.clientWidth) {
539        W = documentElement.clientWidth;
540        H = documentElement.clientHeight;
541      } else {
542        W = body.offsetWidth;
543        H = body.offsetHeight
544      }
545    }
546    return { top: T, left: L, width: W, height: H };
547  }
548};
549
550/*--------------------------------------------------------------------------*/
551
552var SortableObserver = Class.create();
553SortableObserver.prototype = {
554  initialize: function(element, observer) {
555    this.element   = $(element);
556    this.observer  = observer;
557    this.lastValue = Sortable.serialize(this.element);
558  },
559 
560  onStart: function() {
561    this.lastValue = Sortable.serialize(this.element);
562  },
563 
564  onEnd: function() {
565    Sortable.unmark();
566    if(this.lastValue != Sortable.serialize(this.element))
567      this.observer(this.element)
568  }
569};
570
571var Sortable = {
572  SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
573 
574  sortables: {},
575 
576  _findRootElement: function(element) {
577    while (element.tagName != "BODY") { 
578      if(element.id && Sortable.sortables[element.id]) return element;
579      element = element.parentNode;
580    }
581  },
582
583  options: function(element) {
584    element = Sortable._findRootElement($(element));
585    if(!element) return;
586    return Sortable.sortables[element.id];
587  },
588 
589  destroy: function(element){
590    var s = Sortable.options(element);
591   
592    if(s) {
593      Draggables.removeObserver(s.element);
594      s.droppables.each(function(d){ Droppables.remove(d) });
595      s.draggables.invoke('destroy');
596     
597      delete Sortable.sortables[s.element.id];
598    }
599  },
600
601  create: function(element) {
602    element = $(element);
603    var options = Object.extend({
604      element:     element,
605      tag:         'li',       // assumes li children, override with tag: 'tagname'
606      dropOnEmpty: false,
607      tree:        false,
608      treeTag:     'ul',
609      overlap:     'vertical', // one of 'vertical', 'horizontal'
610      constraint:  'vertical', // one of 'vertical', 'horizontal', false
611      containment: element,    // also takes array of elements (or id's); or false
612      handle:      false,      // or a CSS class
613      only:        false,
614      delay:       0,
615      hoverclass:  null,
616      ghosting:    false,
617      scroll:      false,
618      scrollSensitivity: 20,
619      scrollSpeed: 15,
620      format:      this.SERIALIZE_RULE,
621      onChange:    Prototype.emptyFunction,
622      onUpdate:    Prototype.emptyFunction
623    }, arguments[1] || {});
624
625    // clear any old sortable with same element
626    this.destroy(element);
627
628    // build options for the draggables
629    var options_for_draggable = {
630      revert:      true,
631      scroll:      options.scroll,
632      scrollSpeed: options.scrollSpeed,
633      scrollSensitivity: options.scrollSensitivity,
634      delay:       options.delay,
635      ghosting:    options.ghosting,
636      constraint:  options.constraint,
637      handle:      options.handle };
638
639    if(options.starteffect)
640      options_for_draggable.starteffect = options.starteffect;
641
642    if(options.reverteffect)
643      options_for_draggable.reverteffect = options.reverteffect;
644    else
645      if(options.ghosting) options_for_draggable.reverteffect = function(element) {
646        element.style.top  = 0;
647        element.style.left = 0;
648      };
649
650    if(options.endeffect)
651      options_for_draggable.endeffect = options.endeffect;
652
653    if(options.zindex)
654      options_for_draggable.zindex = options.zindex;
655
656    // build options for the droppables 
657    var options_for_droppable = {
658      overlap:     options.overlap,
659      containment: options.containment,
660      tree:        options.tree,
661      hoverclass:  options.hoverclass,
662      onHover:     Sortable.onHover
663    };
664   
665    var options_for_tree = {
666      onHover:      Sortable.onEmptyHover,
667      overlap:      options.overlap,
668      containment:  options.containment,
669      hoverclass:   options.hoverclass
670    };
671
672    // fix for gecko engine
673    Element.cleanWhitespace(element);
674
675    options.draggables = [];
676    options.droppables = [];
677
678    // drop on empty handling
679    if(options.dropOnEmpty || options.tree) {
680      Droppables.add(element, options_for_tree);
681      options.droppables.push(element);
682    }
683
684    (this.findElements(element, options) || []).each( function(e) {
685      // handles are per-draggable
686      var handle = options.handle ?
687        $(e).down('.'+options.handle,0) : e;   
688      options.draggables.push(
689        new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
690      Droppables.add(e, options_for_droppable);
691      if(options.tree) e.treeNode = element;
692      options.droppables.push(e);     
693    });
694   
695    if(options.tree) {
696      (Sortable.findTreeElements(element, options) || []).each( function(e) {
697        Droppables.add(e, options_for_tree);
698        e.treeNode = element;
699        options.droppables.push(e);
700      });
701    }
702
703    // keep reference
704    this.sortables[element.id] = options;
705
706    // for onupdate
707    Draggables.addObserver(new SortableObserver(element, options.onUpdate));
708
709  },
710
711  // return all suitable-for-sortable elements in a guaranteed order
712  findElements: function(element, options) {
713    return Element.findChildren(
714      element, options.only, options.tree ? true : false, options.tag);
715  },
716 
717  findTreeElements: function(element, options) {
718    return Element.findChildren(
719      element, options.only, options.tree ? true : false, options.treeTag);
720  },
721
722  onHover: function(element, dropon, overlap) {
723    if(Element.isParent(dropon, element)) return;
724
725    if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
726      return;
727    } else if(overlap>0.5) {
728      Sortable.mark(dropon, 'before');
729      if(dropon.previousSibling != element) {
730        var oldParentNode = element.parentNode;
731        element.style.visibility = "hidden"; // fix gecko rendering
732        dropon.parentNode.insertBefore(element, dropon);
733        if(dropon.parentNode!=oldParentNode)
734          Sortable.options(oldParentNode).onChange(element);
735        Sortable.options(dropon.parentNode).onChange(element);
736      }
737    } else {
738      Sortable.mark(dropon, 'after');
739      var nextElement = dropon.nextSibling || null;
740      if(nextElement != element) {
741        var oldParentNode = element.parentNode;
742        element.style.visibility = "hidden"; // fix gecko rendering
743        dropon.parentNode.insertBefore(element, nextElement);
744        if(dropon.parentNode!=oldParentNode)
745          Sortable.options(oldParentNode).onChange(element);
746        Sortable.options(dropon.parentNode).onChange(element);
747      }
748    }
749  },
750 
751  onEmptyHover: function(element, dropon, overlap) {
752    var oldParentNode = element.parentNode;
753    var droponOptions = Sortable.options(dropon);
754       
755    if(!Element.isParent(dropon, element)) {
756      var index;
757     
758      var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
759      var child = null;
760           
761      if(children) {
762        var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
763       
764        for (index = 0; index < children.length; index += 1) {
765          if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
766            offset -= Element.offsetSize (children[index], droponOptions.overlap);
767          } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
768            child = index + 1 < children.length ? children[index + 1] : null;
769            break;
770          } else {
771            child = children[index];
772            break;
773          }
774        }
775      }
776     
777      dropon.insertBefore(element, child);
778     
779      Sortable.options(oldParentNode).onChange(element);
780      droponOptions.onChange(element);
781    }
782  },
783
784  unmark: function() {
785    if(Sortable._marker) Sortable._marker.hide();
786  },
787
788  mark: function(dropon, position) {
789    // mark on ghosting only
790    var sortable = Sortable.options(dropon.parentNode);
791    if(sortable && !sortable.ghosting) return;
792
793    if(!Sortable._marker) {
794      Sortable._marker =
795        ($('dropmarker') || Element.extend(document.createElement('DIV'))).
796          hide().addClassName('dropmarker').setStyle({position:'absolute'});
797      document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
798    }   
799    var offsets = Position.cumulativeOffset(dropon);
800    Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
801   
802    if(position=='after')
803      if(sortable.overlap == 'horizontal')
804        Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
805      else
806        Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
807   
808    Sortable._marker.show();
809  },
810 
811  _tree: function(element, options, parent) {
812    var children = Sortable.findElements(element, options) || [];
813 
814    for (var i = 0; i < children.length; ++i) {
815      var match = children[i].id.match(options.format);
816
817      if (!match) continue;
818     
819      var child = {
820        id: encodeURIComponent(match ? match[1] : null),
821        element: element,
822        parent: parent,
823        children: [],
824        position: parent.children.length,
825        container: $(children[i]).down(options.treeTag)
826      };
827     
828      /* Get the element containing the children and recurse over it */
829      if (child.container)
830        this._tree(child.container, options, child);
831     
832      parent.children.push (child);
833    }
834
835    return parent;
836  },
837
838  tree: function(element) {
839    element = $(element);
840    var sortableOptions = this.options(element);
841    var options = Object.extend({
842      tag: sortableOptions.tag,
843      treeTag: sortableOptions.treeTag,
844      only: sortableOptions.only,
845      name: element.id,
846      format: sortableOptions.format
847    }, arguments[1] || {});
848   
849    var root = {
850      id: null,
851      parent: null,
852      children: [],
853      container: element,
854      position: 0
855    };
856   
857    return Sortable._tree(element, options, root);
858  },
859
860  /* Construct a [i] index for a particular node */
861  _constructIndex: function(node) {
862    var index = '';
863    do {
864      if (node.id) index = '[' + node.position + ']' + index;
865    } while ((node = node.parent) != null);
866    return index;
867  },
868
869  sequence: function(element) {
870    element = $(element);
871    var options = Object.extend(this.options(element), arguments[1] || {});
872   
873    return $(this.findElements(element, options) || []).map( function(item) {
874      return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
875    });
876  },
877
878  setSequence: function(element, new_sequence) {
879    element = $(element);
880    var options = Object.extend(this.options(element), arguments[2] || {});
881   
882    var nodeMap = {};
883    this.findElements(element, options).each( function(n) {
884        if (n.id.match(options.format))
885            nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
886        n.parentNode.removeChild(n);
887    });
888   
889    new_sequence.each(function(ident) {
890      var n = nodeMap[ident];
891      if (n) {
892        n[1].appendChild(n[0]);
893        delete nodeMap[ident];
894      }
895    });
896  },
897 
898  serialize: function(element) {
899    element = $(element);
900    var options = Object.extend(Sortable.options(element), arguments[1] || {});
901    var name = encodeURIComponent(
902      (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
903   
904    if (options.tree) {
905      return Sortable.tree(element, arguments[1]).children.map( function (item) {
906        return [name + Sortable._constructIndex(item) + "[id]=" +
907                encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
908      }).flatten().join('&');
909    } else {
910      return Sortable.sequence(element, arguments[1]).map( function(item) {
911        return name + "[]=" + encodeURIComponent(item);
912      }).join('&');
913    }
914  }
915};
916
917// Returns true if child is contained within element
918Element.isParent = function(child, element) {
919  if (!child.parentNode || child == element) return false;
920  if (child.parentNode == element) return true;
921  return Element.isParent(child.parentNode, element);
922};
923
924Element.findChildren = function(element, only, recursive, tagName) {   
925  if(!element.hasChildNodes()) return null;
926  tagName = tagName.toUpperCase();
927  if(only) only = [only].flatten();
928  var elements = [];
929  $A(element.childNodes).each( function(e) {
930    if(e.tagName && e.tagName.toUpperCase()==tagName &&
931      (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
932        elements.push(e);
933    if(recursive) {
934      var grandchildren = Element.findChildren(e, only, recursive, tagName);
935      if(grandchildren) elements.push(grandchildren);
936    }
937  });
938
939  return (elements.length>0 ? elements.flatten() : []);
940};
941
942Element.offsetSize = function (element, type) {
943  return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
944};
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