/public/dragdrop.js
JavaScript | 972 lines | 786 code | 161 blank | 25 comment | 219 complexity | b2a7b9d3d5c10565fd9ff7c72702603e MD5 | raw file
1// Copyright (c) 2005-2010 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
2//
3// script.aculo.us is freely distributable under the terms of an MIT-style license.
4// For details, see the script.aculo.us web site: http://script.aculo.us/
5
6if(Object.isUndefined(Effect))
7 throw("dragdrop.js requires including script.aculo.us' effects.js library");
8
9var Droppables = {
10 drops: [],
11
12 remove: function(element) {
13 this.drops = this.drops.reject(function(d) { return d.element==$(element) });
14 },
15
16 add: function(element) {
17 element = $(element);
18 var options = Object.extend({
19 greedy: true,
20 hoverclass: null,
21 tree: false
22 }, arguments[1] || { });
23
24 // cache containers
25 if(options.containment) {
26 options._containers = [];
27 var containment = options.containment;
28 if(Object.isArray(containment)) {
29 containment.each( function(c) { options._containers.push($(c)) });
30 } else {
31 options._containers.push($(containment));
32 }
33 }
34
35 if(options.accept) options.accept = [options.accept].flatten();
36
37 Element.makePositioned(element); // fix IE
38 options.element = element;
39
40 this.drops.push(options);
41 },
42
43 findDeepestChild: function(drops) {
44 deepest = drops[0];
45
46 for (i = 1; i < drops.length; ++i)
47 if (Element.isParent(drops[i].element, deepest.element))
48 deepest = drops[i];
49
50 return deepest;
51 },
52
53 isContained: function(element, drop) {
54 var containmentNode;
55 if(drop.tree) {
56 containmentNode = element.treeNode;
57 } else {
58 containmentNode = element.parentNode;
59 }
60 return drop._containers.detect(function(c) { return containmentNode == c });
61 },
62
63 isAffected: function(point, element, drop) {
64 return (
65 (drop.element!=element) &&
66 ((!drop._containers) ||
67 this.isContained(element, drop)) &&
68 ((!drop.accept) ||
69 (Element.classNames(element).detect(
70 function(v) { return drop.accept.include(v) } ) )) &&
71 Position.within(drop.element, point[0], point[1]) );
72 },
73
74 deactivate: function(drop) {
75 if(drop.hoverclass)
76 Element.removeClassName(drop.element, drop.hoverclass);
77 this.last_active = null;
78 },
79
80 activate: function(drop) {
81 if(drop.hoverclass)
82 Element.addClassName(drop.element, drop.hoverclass);
83 this.last_active = drop;
84 },
85
86 show: function(point, element) {
87 if(!this.drops.length) return;
88 var drop, affected = [];
89
90 this.drops.each( function(drop) {
91 if(Droppables.isAffected(point, element, drop))
92 affected.push(drop);
93 });
94
95 if(affected.length>0)
96 drop = Droppables.findDeepestChild(affected);
97
98 if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
99 if (drop) {
100 Position.within(drop.element, point[0], point[1]);
101 if(drop.onHover)
102 drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
103
104 if (drop != this.last_active) Droppables.activate(drop);
105 }
106 },
107
108 fire: function(event, element) {
109 if(!this.last_active) return;
110 Position.prepare();
111
112 if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
113 if (this.last_active.onDrop) {
114 this.last_active.onDrop(element, this.last_active.element, event);
115 return true;
116 }
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({
225 initialize: function(element) {
226 var defaults = {
227 handle: false,
228 reverteffect: function(element, top_offset, left_offset) {
229 var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
230 new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
231 queue: {scope:'_draggable', position:'end'}
232 });
233 },
234 endeffect: function(element) {
235 var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;
236 new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity,
237 queue: {scope:'_draggable', position:'end'},
238 afterFinish: function(){
239 Draggable._dragging[element] = false
240 }
241 });
242 },
243 zindex: 1000,
244 revert: false,
245 quiet: false,
246 scroll: false,
247 scrollSensitivity: 20,
248 scrollSpeed: 15,
249 snap: false, // false, or xy or [x,y] or function(x,y){ return [x,y] }
250 delay: 0
251 };
252
253 if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
254 Object.extend(defaults, {
255 starteffect: function(element) {
256 element._opacity = Element.getOpacity(element);
257 Draggable._dragging[element] = true;
258 new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});
259 }
260 });
261
262 var options = Object.extend(defaults, arguments[1] || { });
263
264 this.element = $(element);
265
266 if(options.handle && Object.isString(options.handle))
267 this.handle = this.element.down('.'+options.handle, 0);
268
269 if(!this.handle) this.handle = $(options.handle);
270 if(!this.handle) this.handle = this.element;
271
272 if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
273 options.scroll = $(options.scroll);
274 this._isScrollChild = Element.childOf(this.element, options.scroll);
275 }
276
277 Element.makePositioned(this.element); // fix IE
278
279 this.options = options;
280 this.dragging = false;
281
282 this.eventMouseDown = this.initDrag.bindAsEventListener(this);
283 Event.observe(this.handle, "mousedown", this.eventMouseDown);
284
285 Draggables.register(this);
286 },
287
288 destroy: function() {
289 Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
290 Draggables.unregister(this);
291 },
292
293 currentDelta: function() {
294 return([
295 parseInt(Element.getStyle(this.element,'left') || '0'),
296 parseInt(Element.getStyle(this.element,'top') || '0')]);
297 },
298
299 initDrag: function(event) {
300 if(!Object.isUndefined(Draggable._dragging[this.element]) &&
301 Draggable._dragging[this.element]) return;
302 if(Event.isLeftClick(event)) {
303 // abort on form elements, fixes a Firefox issue
304 var src = Event.element(event);
305 if((tag_name = src.tagName.toUpperCase()) && (
306 tag_name=='INPUT' ||
307 tag_name=='SELECT' ||
308 tag_name=='OPTION' ||
309 tag_name=='BUTTON' ||
310 tag_name=='TEXTAREA')) return;
311
312 var pointer = [Event.pointerX(event), Event.pointerY(event)];
313 var pos = this.element.cumulativeOffset();
314 this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
315
316 Draggables.activate(this);
317 Event.stop(event);
318 }
319 },
320
321 startDrag: function(event) {
322 this.dragging = true;
323 if(!this.delta)
324 this.delta = this.currentDelta();
325
326 if(this.options.zindex) {
327 this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
328 this.element.style.zIndex = this.options.zindex;
329 }
330
331 if(this.options.ghosting) {
332 this._clone = this.element.cloneNode(true);
333 this._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
334 if (!this._originallyAbsolute)
335 Position.absolutize(this.element);
336 this.element.parentNode.insertBefore(this._clone, this.element);
337 }
338
339 if(this.options.scroll) {
340 if (this.options.scroll == window) {
341 var where = this._getWindowScroll(this.options.scroll);
342 this.originalScrollLeft = where.left;
343 this.originalScrollTop = where.top;
344 } else {
345 this.originalScrollLeft = this.options.scroll.scrollLeft;
346 this.originalScrollTop = this.options.scroll.scrollTop;
347 }
348 }
349
350 Draggables.notify('onStart', this, event);
351
352 if(this.options.starteffect) this.options.starteffect(this.element);
353 },
354
355 updateDrag: function(event, pointer) {
356 if(!this.dragging) this.startDrag(event);
357
358 if(!this.options.quiet){
359 Position.prepare();
360 Droppables.show(pointer, this.element);
361 }
362
363 Draggables.notify('onDrag', this, event);
364
365 this.draw(pointer);
366 if(this.options.change) this.options.change(this);
367
368 if(this.options.scroll) {
369 this.stopScrolling();
370
371 var p;
372 if (this.options.scroll == window) {
373 with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
374 } else {
375 p = Position.page(this.options.scroll).toArray();
376 p[0] += this.options.scroll.scrollLeft + Position.deltaX;
377 p[1] += this.options.scroll.scrollTop + Position.deltaY;
378 p.push(p[0]+this.options.scroll.offsetWidth);
379 p.push(p[1]+this.options.scroll.offsetHeight);
380 }
381 var speed = [0,0];
382 if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
383 if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
384 if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
385 if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
386 this.startScrolling(speed);
387 }
388
389 // fix AppleWebKit rendering
390 if(Prototype.Browser.WebKit) window.scrollBy(0,0);
391
392 Event.stop(event);
393 },
394
395 finishDrag: function(event, success) {
396 this.dragging = false;
397
398 if(this.options.quiet){
399 Position.prepare();
400 var pointer = [Event.pointerX(event), Event.pointerY(event)];
401 Droppables.show(pointer, this.element);
402 }
403
404 if(this.options.ghosting) {
405 if (!this._originallyAbsolute)
406 Position.relativize(this.element);
407 delete this._originallyAbsolute;
408 Element.remove(this._clone);
409 this._clone = null;
410 }
411
412 var dropped = false;
413 if(success) {
414 dropped = Droppables.fire(event, this.element);
415 if (!dropped) dropped = false;
416 }
417 if(dropped && this.options.onDropped) this.options.onDropped(this.element);
418 Draggables.notify('onEnd', this, event);
419
420 var revert = this.options.revert;
421 if(revert && Object.isFunction(revert)) revert = revert(this.element);
422
423 var d = this.currentDelta();
424 if(revert && this.options.reverteffect) {
425 if (dropped == 0 || revert != 'failure')
426 this.options.reverteffect(this.element,
427 d[1]-this.delta[1], d[0]-this.delta[0]);
428 } else {
429 this.delta = d;
430 }
431
432 if(this.options.zindex)
433 this.element.style.zIndex = this.originalZ;
434
435 if(this.options.endeffect)
436 this.options.endeffect(this.element);
437
438 Draggables.deactivate(this);
439 Droppables.reset();
440 },
441
442 keyPress: function(event) {
443 if(event.keyCode!=Event.KEY_ESC) return;
444 this.finishDrag(event, false);
445 Event.stop(event);
446 },
447
448 endDrag: function(event) {
449 if(!this.dragging) return;
450 this.stopScrolling();
451 this.finishDrag(event, true);
452 Event.stop(event);
453 },
454
455 draw: function(point) {
456 var pos = this.element.cumulativeOffset();
457 if(this.options.ghosting) {
458 var r = Position.realOffset(this.element);
459 pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
460 }
461
462 var d = this.currentDelta();
463 pos[0] -= d[0]; pos[1] -= d[1];
464
465 if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
466 pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
467 pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
468 }
469
470 var p = [0,1].map(function(i){
471 return (point[i]-pos[i]-this.offset[i])
472 }.bind(this));
473
474 if(this.options.snap) {
475 if(Object.isFunction(this.options.snap)) {
476 p = this.options.snap(p[0],p[1],this);
477 } else {
478 if(Object.isArray(this.options.snap)) {
479 p = p.map( function(v, i) {
480 return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this));
481 } else {
482 p = p.map( function(v) {
483 return (v/this.options.snap).round()*this.options.snap }.bind(this));
484 }
485 }}
486
487 var style = this.element.style;
488 if((!this.options.constraint) || (this.options.constraint=='horizontal'))
489 style.left = p[0] + "px";
490 if((!this.options.constraint) || (this.options.constraint=='vertical'))
491 style.top = p[1] + "px";
492
493 if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
494 },
495
496 stopScrolling: function() {
497 if(this.scrollInterval) {
498 clearInterval(this.scrollInterval);
499 this.scrollInterval = null;
500 Draggables._lastScrollPointer = null;
501 }
502 },
503
504 startScrolling: function(speed) {
505 if(!(speed[0] || speed[1])) return;
506 this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
507 this.lastScrolled = new Date();
508 this.scrollInterval = setInterval(this.scroll.bind(this), 10);
509 },
510
511 scroll: function() {
512 var current = new Date();
513 var delta = current - this.lastScrolled;
514 this.lastScrolled = current;
515 if(this.options.scroll == window) {
516 with (this._getWindowScroll(this.options.scroll)) {
517 if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
518 var d = delta / 1000;
519 this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
520 }
521 }
522 } else {
523 this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
524 this.options.scroll.scrollTop += this.scrollSpeed[1] * delta / 1000;
525 }
526
527 Position.prepare();
528 Droppables.show(Draggables._lastPointer, this.element);
529 Draggables.notify('onDrag', this);
530 if (this._isScrollChild) {
531 Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
532 Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
533 Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
534 if (Draggables._lastScrollPointer[0] < 0)
535 Draggables._lastScrollPointer[0] = 0;
536 if (Draggables._lastScrollPointer[1] < 0)
537 Draggables._lastScrollPointer[1] = 0;
538 this.draw(Draggables._lastScrollPointer);
539 }
540
541 if(this.options.change) this.options.change(this);
542 },
543
544 _getWindowScroll: function(w) {
545 var T, L, W, H;
546 with (w.document) {
547 if (w.document.documentElement && documentElement.scrollTop) {
548 T = documentElement.scrollTop;
549 L = documentElement.scrollLeft;
550 } else if (w.document.body) {
551 T = body.scrollTop;
552 L = body.scrollLeft;
553 }
554 if (w.innerWidth) {
555 W = w.innerWidth;
556 H = w.innerHeight;
557 } else if (w.document.documentElement && documentElement.clientWidth) {
558 W = documentElement.clientWidth;
559 H = documentElement.clientHeight;
560 } else {
561 W = body.offsetWidth;
562 H = body.offsetHeight;
563 }
564 }
565 return { top: T, left: L, width: W, height: H };
566 }
567});
568
569Draggable._dragging = { };
570
571/*--------------------------------------------------------------------------*/
572
573var SortableObserver = Class.create({
574 initialize: function(element, observer) {
575 this.element = $(element);
576 this.observer = observer;
577 this.lastValue = Sortable.serialize(this.element);
578 },
579
580 onStart: function() {
581 this.lastValue = Sortable.serialize(this.element);
582 },
583
584 onEnd: function() {
585 Sortable.unmark();
586 if(this.lastValue != Sortable.serialize(this.element))
587 this.observer(this.element)
588 }
589});
590
591var Sortable = {
592 SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
593
594 sortables: { },
595
596 _findRootElement: function(element) {
597 while (element.tagName.toUpperCase() != "BODY") {
598 if(element.id && Sortable.sortables[element.id]) return element;
599 element = element.parentNode;
600 }
601 },
602
603 options: function(element) {
604 element = Sortable._findRootElement($(element));
605 if(!element) return;
606 return Sortable.sortables[element.id];
607 },
608
609 destroy: function(element){
610 element = $(element);
611 var s = Sortable.sortables[element.id];
612
613 if(s) {
614 Draggables.removeObserver(s.element);
615 s.droppables.each(function(d){ Droppables.remove(d) });
616 s.draggables.invoke('destroy');
617
618 delete Sortable.sortables[s.element.id];
619 }
620 },
621
622 create: function(element) {
623 element = $(element);
624 var options = Object.extend({
625 element: element,
626 tag: 'li', // assumes li children, override with tag: 'tagname'
627 dropOnEmpty: false,
628 tree: false,
629 treeTag: 'ul',
630 overlap: 'vertical', // one of 'vertical', 'horizontal'
631 constraint: 'vertical', // one of 'vertical', 'horizontal', false
632 containment: element, // also takes array of elements (or id's); or false
633 handle: false, // or a CSS class
634 only: false,
635 delay: 0,
636 hoverclass: null,
637 ghosting: false,
638 quiet: false,
639 scroll: false,
640 scrollSensitivity: 20,
641 scrollSpeed: 15,
642 format: this.SERIALIZE_RULE,
643
644 // these take arrays of elements or ids and can be
645 // used for better initialization performance
646 elements: false,
647 handles: false,
648
649 onChange: Prototype.emptyFunction,
650 onUpdate: Prototype.emptyFunction
651 }, arguments[1] || { });
652
653 // clear any old sortable with same element
654 this.destroy(element);
655
656 // build options for the draggables
657 var options_for_draggable = {
658 revert: true,
659 quiet: options.quiet,
660 scroll: options.scroll,
661 scrollSpeed: options.scrollSpeed,
662 scrollSensitivity: options.scrollSensitivity,
663 delay: options.delay,
664 ghosting: options.ghosting,
665 constraint: options.constraint,
666 handle: options.handle };
667
668 if(options.starteffect)
669 options_for_draggable.starteffect = options.starteffect;
670
671 if(options.reverteffect)
672 options_for_draggable.reverteffect = options.reverteffect;
673 else
674 if(options.ghosting) options_for_draggable.reverteffect = function(element) {
675 element.style.top = 0;
676 element.style.left = 0;
677 };
678
679 if(options.endeffect)
680 options_for_draggable.endeffect = options.endeffect;
681
682 if(options.zindex)
683 options_for_draggable.zindex = options.zindex;
684
685 // build options for the droppables
686 var options_for_droppable = {
687 overlap: options.overlap,
688 containment: options.containment,
689 tree: options.tree,
690 hoverclass: options.hoverclass,
691 onHover: Sortable.onHover
692 };
693
694 var options_for_tree = {
695 onHover: Sortable.onEmptyHover,
696 overlap: options.overlap,
697 containment: options.containment,
698 hoverclass: options.hoverclass
699 };
700
701 // fix for gecko engine
702 Element.cleanWhitespace(element);
703
704 options.draggables = [];
705 options.droppables = [];
706
707 // drop on empty handling
708 if(options.dropOnEmpty || options.tree) {
709 Droppables.add(element, options_for_tree);
710 options.droppables.push(element);
711 }
712
713 (options.elements || this.findElements(element, options) || []).each( function(e,i) {
714 var handle = options.handles ? $(options.handles[i]) :
715 (options.handle ? $(e).select('.' + options.handle)[0] : e);
716 options.draggables.push(
717 new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
718 Droppables.add(e, options_for_droppable);
719 if(options.tree) e.treeNode = element;
720 options.droppables.push(e);
721 });
722
723 if(options.tree) {
724 (Sortable.findTreeElements(element, options) || []).each( function(e) {
725 Droppables.add(e, options_for_tree);
726 e.treeNode = element;
727 options.droppables.push(e);
728 });
729 }
730
731 // keep reference
732 this.sortables[element.identify()] = options;
733
734 // for onupdate
735 Draggables.addObserver(new SortableObserver(element, options.onUpdate));
736
737 },
738
739 // return all suitable-for-sortable elements in a guaranteed order
740 findElements: function(element, options) {
741 return Element.findChildren(
742 element, options.only, options.tree ? true : false, options.tag);
743 },
744
745 findTreeElements: function(element, options) {
746 return Element.findChildren(
747 element, options.only, options.tree ? true : false, options.treeTag);
748 },
749
750 onHover: function(element, dropon, overlap) {
751 if(Element.isParent(dropon, element)) return;
752
753 if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
754 return;
755 } else if(overlap>0.5) {
756 Sortable.mark(dropon, 'before');
757 if(dropon.previousSibling != element) {
758 var oldParentNode = element.parentNode;
759 element.style.visibility = "hidden"; // fix gecko rendering
760 dropon.parentNode.insertBefore(element, dropon);
761 if(dropon.parentNode!=oldParentNode)
762 Sortable.options(oldParentNode).onChange(element);
763 Sortable.options(dropon.parentNode).onChange(element);
764 }
765 } else {
766 Sortable.mark(dropon, 'after');
767 var nextElement = dropon.nextSibling || null;
768 if(nextElement != element) {
769 var oldParentNode = element.parentNode;
770 element.style.visibility = "hidden"; // fix gecko rendering
771 dropon.parentNode.insertBefore(element, nextElement);
772 if(dropon.parentNode!=oldParentNode)
773 Sortable.options(oldParentNode).onChange(element);
774 Sortable.options(dropon.parentNode).onChange(element);
775 }
776 }
777 },
778
779 onEmptyHover: function(element, dropon, overlap) {
780 var oldParentNode = element.parentNode;
781 var droponOptions = Sortable.options(dropon);
782
783 if(!Element.isParent(dropon, element)) {
784 var index;
785
786 var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
787 var child = null;
788
789 if(children) {
790 var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
791
792 for (index = 0; index < children.length; index += 1) {
793 if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
794 offset -= Element.offsetSize (children[index], droponOptions.overlap);
795 } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
796 child = index + 1 < children.length ? children[index + 1] : null;
797 break;
798 } else {
799 child = children[index];
800 break;
801 }
802 }
803 }
804
805 dropon.insertBefore(element, child);
806
807 Sortable.options(oldParentNode).onChange(element);
808 droponOptions.onChange(element);
809 }
810 },
811
812 unmark: function() {
813 if(Sortable._marker) Sortable._marker.hide();
814 },
815
816 mark: function(dropon, position) {
817 // mark on ghosting only
818 var sortable = Sortable.options(dropon.parentNode);
819 if(sortable && !sortable.ghosting) return;
820
821 if(!Sortable._marker) {
822 Sortable._marker =
823 ($('dropmarker') || Element.extend(document.createElement('DIV'))).
824 hide().addClassName('dropmarker').setStyle({position:'absolute'});
825 document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
826 }
827 var offsets = dropon.cumulativeOffset();
828 Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
829
830 if(position=='after')
831 if(sortable.overlap == 'horizontal')
832 Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
833 else
834 Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
835
836 Sortable._marker.show();
837 },
838
839 _tree: function(element, options, parent) {
840 var children = Sortable.findElements(element, options) || [];
841
842 for (var i = 0; i < children.length; ++i) {
843 var match = children[i].id.match(options.format);
844
845 if (!match) continue;
846
847 var child = {
848 id: encodeURIComponent(match ? match[1] : null),
849 element: element,
850 parent: parent,
851 children: [],
852 position: parent.children.length,
853 container: $(children[i]).down(options.treeTag)
854 };
855
856 /* Get the element containing the children and recurse over it */
857 if (child.container)
858 this._tree(child.container, options, child);
859
860 parent.children.push (child);
861 }
862
863 return parent;
864 },
865
866 tree: function(element) {
867 element = $(element);
868 var sortableOptions = this.options(element);
869 var options = Object.extend({
870 tag: sortableOptions.tag,
871 treeTag: sortableOptions.treeTag,
872 only: sortableOptions.only,
873 name: element.id,
874 format: sortableOptions.format
875 }, arguments[1] || { });
876
877 var root = {
878 id: null,
879 parent: null,
880 children: [],
881 container: element,
882 position: 0
883 };
884
885 return Sortable._tree(element, options, root);
886 },
887
888 /* Construct a [i] index for a particular node */
889 _constructIndex: function(node) {
890 var index = '';
891 do {
892 if (node.id) index = '[' + node.position + ']' + index;
893 } while ((node = node.parent) != null);
894 return index;
895 },
896
897 sequence: function(element) {
898 element = $(element);
899 var options = Object.extend(this.options(element), arguments[1] || { });
900
901 return $(this.findElements(element, options) || []).map( function(item) {
902 return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
903 });
904 },
905
906 setSequence: function(element, new_sequence) {
907 element = $(element);
908 var options = Object.extend(this.options(element), arguments[2] || { });
909
910 var nodeMap = { };
911 this.findElements(element, options).each( function(n) {
912 if (n.id.match(options.format))
913 nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
914 n.parentNode.removeChild(n);
915 });
916
917 new_sequence.each(function(ident) {
918 var n = nodeMap[ident];
919 if (n) {
920 n[1].appendChild(n[0]);
921 delete nodeMap[ident];
922 }
923 });
924 },
925
926 serialize: function(element) {
927 element = $(element);
928 var options = Object.extend(Sortable.options(element), arguments[1] || { });
929 var name = encodeURIComponent(
930 (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
931
932 if (options.tree) {
933 return Sortable.tree(element, arguments[1]).children.map( function (item) {
934 return [name + Sortable._constructIndex(item) + "[id]=" +
935 encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
936 }).flatten().join('&');
937 } else {
938 return Sortable.sequence(element, arguments[1]).map( function(item) {
939 return name + "[]=" + encodeURIComponent(item);
940 }).join('&');
941 }
942 }
943};
944
945// Returns true if child is contained within element
946Element.isParent = function(child, element) {
947 if (!child.parentNode || child == element) return false;
948 if (child.parentNode == element) return true;
949 return Element.isParent(child.parentNode, element);
950};
951
952Element.findChildren = function(element, only, recursive, tagName) {
953 if(!element.hasChildNodes()) return null;
954 tagName = tagName.toUpperCase();
955 if(only) only = [only].flatten();
956 var elements = [];
957 $A(element.childNodes).each( function(e) {
958 if(e.tagName && e.tagName.toUpperCase()==tagName &&
959 (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
960 elements.push(e);
961 if(recursive) {
962 var grandchildren = Element.findChildren(e, only, recursive, tagName);
963 if(grandchildren) elements.push(grandchildren);
964 }
965 });
966
967 return (elements.length>0 ? elements.flatten() : []);
968};
969
970Element.offsetSize = function (element, type) {
971 return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
972};