source: trunk/www.guidonia.net/wp/wp-includes/js/scriptaculous/dragdrop.js@ 44

Last change on this file since 44 was 44, checked in by luciano, 15 years ago
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1// script.aculo.us dragdrop.js v1.8.0, Tue Nov 06 15:01:40 +0300 2007
2
3// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
4// (c) 2005-2007 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(Object.isUndefined(Effect))
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 = $(element);
21 var options = Object.extend({
22 greedy: true,
23 hoverclass: null,
24 tree: false
25 }, arguments[1] || { });
26
27 // cache containers
28 if(options.containment) {
29 options._containers = [];
30 var containment = options.containment;
31 if(Object.isArray(containment)) {
32 containment.each( function(c) { options._containers.push($(c)) });
33 } else {
34 options._containers.push($(containment));
35 }
36 }
37
38 if(options.accept) options.accept = [options.accept].flatten();
39
40 Element.makePositioned(element); // fix IE
41 options.element = element;
42
43 this.drops.push(options);
44 },
45
46 findDeepestChild: function(drops) {
47 deepest = drops[0];
48
49 for (i = 1; i < drops.length; ++i)
50 if (Element.isParent(drops[i].element, deepest.element))
51 deepest = drops[i];
52
53 return deepest;
54 },
55
56 isContained: function(element, drop) {
57 var containmentNode;
58 if(drop.tree) {
59 containmentNode = element.treeNode;
60 } else {
61 containmentNode = element.parentNode;
62 }
63 return drop._containers.detect(function(c) { return containmentNode == c });
64 },
65
66 isAffected: function(point, element, drop) {
67 return (
68 (drop.element!=element) &&
69 ((!drop._containers) ||
70 this.isContained(element, drop)) &&
71 ((!drop.accept) ||
72 (Element.classNames(element).detect(
73 function(v) { return drop.accept.include(v) } ) )) &&
74 Position.within(drop.element, point[0], point[1]) );
75 },
76
77 deactivate: function(drop) {
78 if(drop.hoverclass)
79 Element.removeClassName(drop.element, drop.hoverclass);
80 this.last_active = null;
81 },
82
83 activate: function(drop) {
84 if(drop.hoverclass)
85 Element.addClassName(drop.element, drop.hoverclass);
86 this.last_active = drop;
87 },
88
89 show: function(point, element) {
90 if(!this.drops.length) return;
91 var drop, affected = [];
92
93 this.drops.each( function(drop) {
94 if(Droppables.isAffected(point, element, drop))
95 affected.push(drop);
96 });
97
98 if(affected.length>0)
99 drop = Droppables.findDeepestChild(affected);
100
101 if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
102 if (drop) {
103 Position.within(drop.element, point[0], point[1]);
104 if(drop.onHover)
105 drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
106
107 if (drop != this.last_active) Droppables.activate(drop);
108 }
109 },
110
111 fire: function(event, element) {
112 if(!this.last_active) return;
113 Position.prepare();
114
115 if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
116 if (this.last_active.onDrop) {
117 this.last_active.onDrop(element, this.last_active.element, event);
118 return true;
119 }
120 },
121
122 reset: function() {
123 if(this.last_active)
124 this.deactivate(this.last_active);
125 }
126}
127
128var Draggables = {
129 drags: [],
130 observers: [],
131
132 register: function(draggable) {
133 if(this.drags.length == 0) {
134 this.eventMouseUp = this.endDrag.bindAsEventListener(this);
135 this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
136 this.eventKeypress = this.keyPress.bindAsEventListener(this);
137
138 Event.observe(document, "mouseup", this.eventMouseUp);
139 Event.observe(document, "mousemove", this.eventMouseMove);
140 Event.observe(document, "keypress", this.eventKeypress);
141 }
142 this.drags.push(draggable);
143 },
144
145 unregister: function(draggable) {
146 this.drags = this.drags.reject(function(d) { return d==draggable });
147 if(this.drags.length == 0) {
148 Event.stopObserving(document, "mouseup", this.eventMouseUp);
149 Event.stopObserving(document, "mousemove", this.eventMouseMove);
150 Event.stopObserving(document, "keypress", this.eventKeypress);
151 }
152 },
153
154 activate: function(draggable) {
155 if(draggable.options.delay) {
156 this._timeout = setTimeout(function() {
157 Draggables._timeout = null;
158 window.focus();
159 Draggables.activeDraggable = draggable;
160 }.bind(this), draggable.options.delay);
161 } else {
162 window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
163 this.activeDraggable = draggable;
164 }
165 },
166
167 deactivate: function() {
168 this.activeDraggable = null;
169 },
170
171 updateDrag: function(event) {
172 if(!this.activeDraggable) return;
173 var pointer = [Event.pointerX(event), Event.pointerY(event)];
174 // Mozilla-based browsers fire successive mousemove events with
175 // the same coordinates, prevent needless redrawing (moz bug?)
176 if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
177 this._lastPointer = pointer;
178
179 this.activeDraggable.updateDrag(event, pointer);
180 },
181
182 endDrag: function(event) {
183 if(this._timeout) {
184 clearTimeout(this._timeout);
185 this._timeout = null;
186 }
187 if(!this.activeDraggable) return;
188 this._lastPointer = null;
189 this.activeDraggable.endDrag(event);
190 this.activeDraggable = null;
191 },
192
193 keyPress: function(event) {
194 if(this.activeDraggable)
195 this.activeDraggable.keyPress(event);
196 },
197
198 addObserver: function(observer) {
199 this.observers.push(observer);
200 this._cacheObserverCallbacks();
201 },
202
203 removeObserver: function(element) { // element instead of observer fixes mem leaks
204 this.observers = this.observers.reject( function(o) { return o.element==element });
205 this._cacheObserverCallbacks();
206 },
207
208 notify: function(eventName, draggable, event) { // 'onStart', 'onEnd', 'onDrag'
209 if(this[eventName+'Count'] > 0)
210 this.observers.each( function(o) {
211 if(o[eventName]) o[eventName](eventName, draggable, event);
212 });
213 if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
214 },
215
216 _cacheObserverCallbacks: function() {
217 ['onStart','onEnd','onDrag'].each( function(eventName) {
218 Draggables[eventName+'Count'] = Draggables.observers.select(
219 function(o) { return o[eventName]; }
220 ).length;
221 });
222 }
223}
224
225/*--------------------------------------------------------------------------*/
226
227var Draggable = Class.create({
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 = Object.isNumber(element._opacity) ? 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 quiet: false,
249 scroll: false,
250 scrollSensitivity: 20,
251 scrollSpeed: 15,
252 snap: false, // false, or xy or [x,y] or function(x,y){ return [x,y] }
253 delay: 0
254 };
255
256 if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
257 Object.extend(defaults, {
258 starteffect: function(element) {
259 element._opacity = Element.getOpacity(element);
260 Draggable._dragging[element] = true;
261 new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});
262 }
263 });
264
265 var options = Object.extend(defaults, arguments[1] || { });
266
267 this.element = $(element);
268
269 if(options.handle && Object.isString(options.handle))
270 this.handle = this.element.down('.'+options.handle, 0);
271
272 if(!this.handle) this.handle = $(options.handle);
273 if(!this.handle) this.handle = this.element;
274
275 if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
276 options.scroll = $(options.scroll);
277 this._isScrollChild = Element.childOf(this.element, options.scroll);
278 }
279
280 Element.makePositioned(this.element); // fix IE
281
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(!Object.isUndefined(Draggable._dragging[this.element]) &&
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((tag_name = src.tagName.toUpperCase()) && (
309 tag_name=='INPUT' ||
310 tag_name=='SELECT' ||
311 tag_name=='OPTION' ||
312 tag_name=='BUTTON' ||
313 tag_name=='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 if(!this.delta)
327 this.delta = this.currentDelta();
328
329 if(this.options.zindex) {
330 this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
331 this.element.style.zIndex = this.options.zindex;
332 }
333
334 if(this.options.ghosting) {
335 this._clone = this.element.cloneNode(true);
336 this.element._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
337 if (!this.element._originallyAbsolute)
338 Position.absolutize(this.element);
339 this.element.parentNode.insertBefore(this._clone, this.element);
340 }
341
342 if(this.options.scroll) {
343 if (this.options.scroll == window) {
344 var where = this._getWindowScroll(this.options.scroll);
345 this.originalScrollLeft = where.left;
346 this.originalScrollTop = where.top;
347 } else {
348 this.originalScrollLeft = this.options.scroll.scrollLeft;
349 this.originalScrollTop = this.options.scroll.scrollTop;
350 }
351 }
352
353 Draggables.notify('onStart', this, event);
354
355 if(this.options.starteffect) this.options.starteffect(this.element);
356 },
357
358 updateDrag: function(event, pointer) {
359 if(!this.dragging) this.startDrag(event);
360
361 if(!this.options.quiet){
362 Position.prepare();
363 Droppables.show(pointer, this.element);
364 }
365
366 Draggables.notify('onDrag', this, event);
367
368 this.draw(pointer);
369 if(this.options.change) this.options.change(this);
370
371 if(this.options.scroll) {
372 this.stopScrolling();
373
374 var p;
375 if (this.options.scroll == window) {
376 with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
377 } else {
378 p = Position.page(this.options.scroll);
379 p[0] += this.options.scroll.scrollLeft + Position.deltaX;
380 p[1] += this.options.scroll.scrollTop + Position.deltaY;
381 p.push(p[0]+this.options.scroll.offsetWidth);
382 p.push(p[1]+this.options.scroll.offsetHeight);
383 }
384 var speed = [0,0];
385 if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
386 if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
387 if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
388 if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
389 this.startScrolling(speed);
390 }
391
392 // fix AppleWebKit rendering
393 if(Prototype.Browser.WebKit) window.scrollBy(0,0);
394
395 Event.stop(event);
396 },
397
398 finishDrag: function(event, success) {
399 this.dragging = false;
400
401 if(this.options.quiet){
402 Position.prepare();
403 var pointer = [Event.pointerX(event), Event.pointerY(event)];
404 Droppables.show(pointer, this.element);
405 }
406
407 if(this.options.ghosting) {
408 if (!this.element._originallyAbsolute)
409 Position.relativize(this.element);
410 delete this.element._originallyAbsolute;
411 Element.remove(this._clone);
412 this._clone = null;
413 }
414
415 var dropped = false;
416 if(success) {
417 dropped = Droppables.fire(event, this.element);
418 if (!dropped) dropped = false;
419 }
420 if(dropped && this.options.onDropped) this.options.onDropped(this.element);
421 Draggables.notify('onEnd', this, event);
422
423 var revert = this.options.revert;
424 if(revert && Object.isFunction(revert)) revert = revert(this.element);
425
426 var d = this.currentDelta();
427 if(revert && this.options.reverteffect) {
428 if (dropped == 0 || revert != 'failure')
429 this.options.reverteffect(this.element,
430 d[1]-this.delta[1], d[0]-this.delta[0]);
431 } else {
432 this.delta = d;
433 }
434
435 if(this.options.zindex)
436 this.element.style.zIndex = this.originalZ;
437
438 if(this.options.endeffect)
439 this.options.endeffect(this.element);
440
441 Draggables.deactivate(this);
442 Droppables.reset();
443 },
444
445 keyPress: function(event) {
446 if(event.keyCode!=Event.KEY_ESC) return;
447 this.finishDrag(event, false);
448 Event.stop(event);
449 },
450
451 endDrag: function(event) {
452 if(!this.dragging) return;
453 this.stopScrolling();
454 this.finishDrag(event, true);
455 Event.stop(event);
456 },
457
458 draw: function(point) {
459 var pos = Position.cumulativeOffset(this.element);
460 if(this.options.ghosting) {
461 var r = Position.realOffset(this.element);
462 pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
463 }
464
465 var d = this.currentDelta();
466 pos[0] -= d[0]; pos[1] -= d[1];
467
468 if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
469 pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
470 pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
471 }
472
473 var p = [0,1].map(function(i){
474 return (point[i]-pos[i]-this.offset[i])
475 }.bind(this));
476
477 if(this.options.snap) {
478 if(Object.isFunction(this.options.snap)) {
479 p = this.options.snap(p[0],p[1],this);
480 } else {
481 if(Object.isArray(this.options.snap)) {
482 p = p.map( function(v, i) {
483 return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this))
484 } else {
485 p = p.map( function(v) {
486 return (v/this.options.snap).round()*this.options.snap }.bind(this))
487 }
488 }}
489
490 var style = this.element.style;
491 if((!this.options.constraint) || (this.options.constraint=='horizontal'))
492 style.left = p[0] + "px";
493 if((!this.options.constraint) || (this.options.constraint=='vertical'))
494 style.top = p[1] + "px";
495
496 if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
497 },
498
499 stopScrolling: function() {
500 if(this.scrollInterval) {
501 clearInterval(this.scrollInterval);
502 this.scrollInterval = null;
503 Draggables._lastScrollPointer = null;
504 }
505 },
506
507 startScrolling: function(speed) {
508 if(!(speed[0] || speed[1])) return;
509 this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
510 this.lastScrolled = new Date();
511 this.scrollInterval = setInterval(this.scroll.bind(this), 10);
512 },
513
514 scroll: function() {
515 var current = new Date();
516 var delta = current - this.lastScrolled;
517 this.lastScrolled = current;
518 if(this.options.scroll == window) {
519 with (this._getWindowScroll(this.options.scroll)) {
520 if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
521 var d = delta / 1000;
522 this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
523 }
524 }
525 } else {
526 this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
527 this.options.scroll.scrollTop += this.scrollSpeed[1] * delta / 1000;
528 }
529
530 Position.prepare();
531 Droppables.show(Draggables._lastPointer, this.element);
532 Draggables.notify('onDrag', this);
533 if (this._isScrollChild) {
534 Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
535 Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
536 Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
537 if (Draggables._lastScrollPointer[0] < 0)
538 Draggables._lastScrollPointer[0] = 0;
539 if (Draggables._lastScrollPointer[1] < 0)
540 Draggables._lastScrollPointer[1] = 0;
541 this.draw(Draggables._lastScrollPointer);
542 }
543
544 if(this.options.change) this.options.change(this);
545 },
546
547 _getWindowScroll: function(w) {
548 var T, L, W, H;
549 with (w.document) {
550 if (w.document.documentElement && documentElement.scrollTop) {
551 T = documentElement.scrollTop;
552 L = documentElement.scrollLeft;
553 } else if (w.document.body) {
554 T = body.scrollTop;
555 L = body.scrollLeft;
556 }
557 if (w.innerWidth) {
558 W = w.innerWidth;
559 H = w.innerHeight;
560 } else if (w.document.documentElement && documentElement.clientWidth) {
561 W = documentElement.clientWidth;
562 H = documentElement.clientHeight;
563 } else {
564 W = body.offsetWidth;
565 H = body.offsetHeight
566 }
567 }
568 return { top: T, left: L, width: W, height: H };
569 }
570});
571
572Draggable._dragging = { };
573
574/*--------------------------------------------------------------------------*/
575
576var SortableObserver = Class.create({
577 initialize: function(element, observer) {
578 this.element = $(element);
579 this.observer = observer;
580 this.lastValue = Sortable.serialize(this.element);
581 },
582
583 onStart: function() {
584 this.lastValue = Sortable.serialize(this.element);
585 },
586
587 onEnd: function() {
588 Sortable.unmark();
589 if(this.lastValue != Sortable.serialize(this.element))
590 this.observer(this.element)
591 }
592});
593
594var Sortable = {
595 SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
596
597 sortables: { },
598
599 _findRootElement: function(element) {
600 while (element.tagName.toUpperCase() != "BODY") {
601 if(element.id && Sortable.sortables[element.id]) return element;
602 element = element.parentNode;
603 }
604 },
605
606 options: function(element) {
607 element = Sortable._findRootElement($(element));
608 if(!element) return;
609 return Sortable.sortables[element.id];
610 },
611
612 destroy: function(element){
613 var s = Sortable.options(element);
614
615 if(s) {
616 Draggables.removeObserver(s.element);
617 s.droppables.each(function(d){ Droppables.remove(d) });
618 s.draggables.invoke('destroy');
619
620 delete Sortable.sortables[s.element.id];
621 }
622 },
623
624 create: function(element) {
625 element = $(element);
626 var options = Object.extend({
627 element: element,
628 tag: 'li', // assumes li children, override with tag: 'tagname'
629 dropOnEmpty: false,
630 tree: false,
631 treeTag: 'ul',
632 overlap: 'vertical', // one of 'vertical', 'horizontal'
633 constraint: 'vertical', // one of 'vertical', 'horizontal', false
634 containment: element, // also takes array of elements (or id's); or false
635 handle: false, // or a CSS class
636 only: false,
637 delay: 0,
638 hoverclass: null,
639 ghosting: false,
640 quiet: false,
641 scroll: false,
642 scrollSensitivity: 20,
643 scrollSpeed: 15,
644 format: this.SERIALIZE_RULE,
645
646 // these take arrays of elements or ids and can be
647 // used for better initialization performance
648 elements: false,
649 handles: false,
650
651 onChange: Prototype.emptyFunction,
652 onUpdate: Prototype.emptyFunction
653 }, arguments[1] || { });
654
655 // clear any old sortable with same element
656 this.destroy(element);
657
658 // build options for the draggables
659 var options_for_draggable = {
660 revert: true,
661 quiet: options.quiet,
662 scroll: options.scroll,
663 scrollSpeed: options.scrollSpeed,
664 scrollSensitivity: options.scrollSensitivity,
665 delay: options.delay,
666 ghosting: options.ghosting,
667 constraint: options.constraint,
668 handle: options.handle };
669
670 if(options.starteffect)
671 options_for_draggable.starteffect = options.starteffect;
672
673 if(options.reverteffect)
674 options_for_draggable.reverteffect = options.reverteffect;
675 else
676 if(options.ghosting) options_for_draggable.reverteffect = function(element) {
677 element.style.top = 0;
678 element.style.left = 0;
679 };
680
681 if(options.endeffect)
682 options_for_draggable.endeffect = options.endeffect;
683
684 if(options.zindex)
685 options_for_draggable.zindex = options.zindex;
686
687 // build options for the droppables
688 var options_for_droppable = {
689 overlap: options.overlap,
690 containment: options.containment,
691 tree: options.tree,
692 hoverclass: options.hoverclass,
693 onHover: Sortable.onHover
694 }
695
696 var options_for_tree = {
697 onHover: Sortable.onEmptyHover,
698 overlap: options.overlap,
699 containment: options.containment,
700 hoverclass: options.hoverclass
701 }
702
703 // fix for gecko engine
704 Element.cleanWhitespace(element);
705
706 options.draggables = [];
707 options.droppables = [];
708
709 // drop on empty handling
710 if(options.dropOnEmpty || options.tree) {
711 Droppables.add(element, options_for_tree);
712 options.droppables.push(element);
713 }
714
715 (options.elements || this.findElements(element, options) || []).each( function(e,i) {
716 var handle = options.handles ? $(options.handles[i]) :
717 (options.handle ? $(e).select('.' + options.handle)[0] : e);
718 options.draggables.push(
719 new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
720 Droppables.add(e, options_for_droppable);
721 if(options.tree) e.treeNode = element;
722 options.droppables.push(e);
723 });
724
725 if(options.tree) {
726 (Sortable.findTreeElements(element, options) || []).each( function(e) {
727 Droppables.add(e, options_for_tree);
728 e.treeNode = element;
729 options.droppables.push(e);
730 });
731 }
732
733 // keep reference
734 this.sortables[element.id] = options;
735
736 // for onupdate
737 Draggables.addObserver(new SortableObserver(element, options.onUpdate));
738
739 },
740
741 // return all suitable-for-sortable elements in a guaranteed order
742 findElements: function(element, options) {
743 return Element.findChildren(
744 element, options.only, options.tree ? true : false, options.tag);
745 },
746
747 findTreeElements: function(element, options) {
748 return Element.findChildren(
749 element, options.only, options.tree ? true : false, options.treeTag);
750 },
751
752 onHover: function(element, dropon, overlap) {
753 if(Element.isParent(dropon, element)) return;
754
755 if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
756 return;
757 } else if(overlap>0.5) {
758 Sortable.mark(dropon, 'before');
759 if(dropon.previousSibling != element) {
760 var oldParentNode = element.parentNode;
761 element.style.visibility = "hidden"; // fix gecko rendering
762 dropon.parentNode.insertBefore(element, dropon);
763 if(dropon.parentNode!=oldParentNode)
764 Sortable.options(oldParentNode).onChange(element);
765 Sortable.options(dropon.parentNode).onChange(element);
766 }
767 } else {
768 Sortable.mark(dropon, 'after');
769 var nextElement = dropon.nextSibling || null;
770 if(nextElement != element) {
771 var oldParentNode = element.parentNode;
772 element.style.visibility = "hidden"; // fix gecko rendering
773 dropon.parentNode.insertBefore(element, nextElement);
774 if(dropon.parentNode!=oldParentNode)
775 Sortable.options(oldParentNode).onChange(element);
776 Sortable.options(dropon.parentNode).onChange(element);
777 }
778 }
779 },
780
781 onEmptyHover: function(element, dropon, overlap) {
782 var oldParentNode = element.parentNode;
783 var droponOptions = Sortable.options(dropon);
784
785 if(!Element.isParent(dropon, element)) {
786 var index;
787
788 var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
789 var child = null;
790
791 if(children) {
792 var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
793
794 for (index = 0; index < children.length; index += 1) {
795 if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
796 offset -= Element.offsetSize (children[index], droponOptions.overlap);
797 } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
798 child = index + 1 < children.length ? children[index + 1] : null;
799 break;
800 } else {
801 child = children[index];
802 break;
803 }
804 }
805 }
806
807 dropon.insertBefore(element, child);
808
809 Sortable.options(oldParentNode).onChange(element);
810 droponOptions.onChange(element);
811 }
812 },
813
814 unmark: function() {
815 if(Sortable._marker) Sortable._marker.hide();
816 },
817
818 mark: function(dropon, position) {
819 // mark on ghosting only
820 var sortable = Sortable.options(dropon.parentNode);
821 if(sortable && !sortable.ghosting) return;
822
823 if(!Sortable._marker) {
824 Sortable._marker =
825 ($('dropmarker') || Element.extend(document.createElement('DIV'))).
826 hide().addClassName('dropmarker').setStyle({position:'absolute'});
827 document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
828 }
829 var offsets = Position.cumulativeOffset(dropon);
830 Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
831
832 if(position=='after')
833 if(sortable.overlap == 'horizontal')
834 Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
835 else
836 Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
837
838 Sortable._marker.show();
839 },
840
841 _tree: function(element, options, parent) {
842 var children = Sortable.findElements(element, options) || [];
843
844 for (var i = 0; i < children.length; ++i) {
845 var match = children[i].id.match(options.format);
846
847 if (!match) continue;
848
849 var child = {
850 id: encodeURIComponent(match ? match[1] : null),
851 element: element,
852 parent: parent,
853 children: [],
854 position: parent.children.length,
855 container: $(children[i]).down(options.treeTag)
856 }
857
858 /* Get the element containing the children and recurse over it */
859 if (child.container)
860 this._tree(child.container, options, child)
861
862 parent.children.push (child);
863 }
864
865 return parent;
866 },
867
868 tree: function(element) {
869 element = $(element);
870 var sortableOptions = this.options(element);
871 var options = Object.extend({
872 tag: sortableOptions.tag,
873 treeTag: sortableOptions.treeTag,
874 only: sortableOptions.only,
875 name: element.id,
876 format: sortableOptions.format
877 }, arguments[1] || { });
878
879 var root = {
880 id: null,
881 parent: null,
882 children: [],
883 container: element,
884 position: 0
885 }
886
887 return Sortable._tree(element, options, root);
888 },
889
890 /* Construct a [i] index for a particular node */
891 _constructIndex: function(node) {
892 var index = '';
893 do {
894 if (node.id) index = '[' + node.position + ']' + index;
895 } while ((node = node.parent) != null);
896 return index;
897 },
898
899 sequence: function(element) {
900 element = $(element);
901 var options = Object.extend(this.options(element), arguments[1] || { });
902
903 return $(this.findElements(element, options) || []).map( function(item) {
904 return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
905 });
906 },
907
908 setSequence: function(element, new_sequence) {
909 element = $(element);
910 var options = Object.extend(this.options(element), arguments[2] || { });
911
912 var nodeMap = { };
913 this.findElements(element, options).each( function(n) {
914 if (n.id.match(options.format))
915 nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
916 n.parentNode.removeChild(n);
917 });
918
919 new_sequence.each(function(ident) {
920 var n = nodeMap[ident];
921 if (n) {
922 n[1].appendChild(n[0]);
923 delete nodeMap[ident];
924 }
925 });
926 },
927
928 serialize: function(element) {
929 element = $(element);
930 var options = Object.extend(Sortable.options(element), arguments[1] || { });
931 var name = encodeURIComponent(
932 (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
933
934 if (options.tree) {
935 return Sortable.tree(element, arguments[1]).children.map( function (item) {
936 return [name + Sortable._constructIndex(item) + "[id]=" +
937 encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
938 }).flatten().join('&');
939 } else {
940 return Sortable.sequence(element, arguments[1]).map( function(item) {
941 return name + "[]=" + encodeURIComponent(item);
942 }).join('&');
943 }
944 }
945}
946
947// Returns true if child is contained within element
948Element.isParent = function(child, element) {
949 if (!child.parentNode || child == element) return false;
950 if (child.parentNode == element) return true;
951 return Element.isParent(child.parentNode, element);
952}
953
954Element.findChildren = function(element, only, recursive, tagName) {
955 if(!element.hasChildNodes()) return null;
956 tagName = tagName.toUpperCase();
957 if(only) only = [only].flatten();
958 var elements = [];
959 $A(element.childNodes).each( function(e) {
960 if(e.tagName && e.tagName.toUpperCase()==tagName &&
961 (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
962 elements.push(e);
963 if(recursive) {
964 var grandchildren = Element.findChildren(e, only, recursive, tagName);
965 if(grandchildren) elements.push(grandchildren);
966 }
967 });
968
969 return (elements.length>0 ? elements.flatten() : []);
970}
971
972Element.offsetSize = function (element, type) {
973 return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
974}
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