source: ruby/branches/0.5/public/javascripts/dragdrop.js@ 169

Last change on this file since 169 was 169, checked in by KOBAYASHI, Shinji, 15 years ago

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File size: 30.4 KB
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1// Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
2// (c) 2005-2008 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
3//
4// script.aculo.us is freely distributable under the terms of an MIT-style license.
5// For details, see the script.aculo.us web site: http://script.aculo.us/
6
7if(Object.isUndefined(Effect))
8 throw("dragdrop.js requires including script.aculo.us' effects.js library");
9
10var Droppables = {
11 drops: [],
12
13 remove: function(element) {
14 this.drops = this.drops.reject(function(d) { return d.element==$(element) });
15 },
16
17 add: function(element) {
18 element = $(element);
19 var options = Object.extend({
20 greedy: true,
21 hoverclass: null,
22 tree: false
23 }, arguments[1] || { });
24
25 // cache containers
26 if(options.containment) {
27 options._containers = [];
28 var containment = options.containment;
29 if(Object.isArray(containment)) {
30 containment.each( function(c) { options._containers.push($(c)) });
31 } else {
32 options._containers.push($(containment));
33 }
34 }
35
36 if(options.accept) options.accept = [options.accept].flatten();
37
38 Element.makePositioned(element); // fix IE
39 options.element = element;
40
41 this.drops.push(options);
42 },
43
44 findDeepestChild: function(drops) {
45 deepest = drops[0];
46
47 for (i = 1; i < drops.length; ++i)
48 if (Element.isParent(drops[i].element, deepest.element))
49 deepest = drops[i];
50
51 return deepest;
52 },
53
54 isContained: function(element, drop) {
55 var containmentNode;
56 if(drop.tree) {
57 containmentNode = element.treeNode;
58 } else {
59 containmentNode = element.parentNode;
60 }
61 return drop._containers.detect(function(c) { return containmentNode == c });
62 },
63
64 isAffected: function(point, element, drop) {
65 return (
66 (drop.element!=element) &&
67 ((!drop._containers) ||
68 this.isContained(element, drop)) &&
69 ((!drop.accept) ||
70 (Element.classNames(element).detect(
71 function(v) { return drop.accept.include(v) } ) )) &&
72 Position.within(drop.element, point[0], point[1]) );
73 },
74
75 deactivate: function(drop) {
76 if(drop.hoverclass)
77 Element.removeClassName(drop.element, drop.hoverclass);
78 this.last_active = null;
79 },
80
81 activate: function(drop) {
82 if(drop.hoverclass)
83 Element.addClassName(drop.element, drop.hoverclass);
84 this.last_active = drop;
85 },
86
87 show: function(point, element) {
88 if(!this.drops.length) return;
89 var drop, affected = [];
90
91 this.drops.each( function(drop) {
92 if(Droppables.isAffected(point, element, drop))
93 affected.push(drop);
94 });
95
96 if(affected.length>0)
97 drop = Droppables.findDeepestChild(affected);
98
99 if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
100 if (drop) {
101 Position.within(drop.element, point[0], point[1]);
102 if(drop.onHover)
103 drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
104
105 if (drop != this.last_active) Droppables.activate(drop);
106 }
107 },
108
109 fire: function(event, element) {
110 if(!this.last_active) return;
111 Position.prepare();
112
113 if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
114 if (this.last_active.onDrop) {
115 this.last_active.onDrop(element, this.last_active.element, event);
116 return true;
117 }
118 },
119
120 reset: function() {
121 if(this.last_active)
122 this.deactivate(this.last_active);
123 }
124};
125
126var Draggables = {
127 drags: [],
128 observers: [],
129
130 register: function(draggable) {
131 if(this.drags.length == 0) {
132 this.eventMouseUp = this.endDrag.bindAsEventListener(this);
133 this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
134 this.eventKeypress = this.keyPress.bindAsEventListener(this);
135
136 Event.observe(document, "mouseup", this.eventMouseUp);
137 Event.observe(document, "mousemove", this.eventMouseMove);
138 Event.observe(document, "keypress", this.eventKeypress);
139 }
140 this.drags.push(draggable);
141 },
142
143 unregister: function(draggable) {
144 this.drags = this.drags.reject(function(d) { return d==draggable });
145 if(this.drags.length == 0) {
146 Event.stopObserving(document, "mouseup", this.eventMouseUp);
147 Event.stopObserving(document, "mousemove", this.eventMouseMove);
148 Event.stopObserving(document, "keypress", this.eventKeypress);
149 }
150 },
151
152 activate: function(draggable) {
153 if(draggable.options.delay) {
154 this._timeout = setTimeout(function() {
155 Draggables._timeout = null;
156 window.focus();
157 Draggables.activeDraggable = draggable;
158 }.bind(this), draggable.options.delay);
159 } else {
160 window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
161 this.activeDraggable = draggable;
162 }
163 },
164
165 deactivate: function() {
166 this.activeDraggable = null;
167 },
168
169 updateDrag: function(event) {
170 if(!this.activeDraggable) return;
171 var pointer = [Event.pointerX(event), Event.pointerY(event)];
172 // Mozilla-based browsers fire successive mousemove events with
173 // the same coordinates, prevent needless redrawing (moz bug?)
174 if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
175 this._lastPointer = pointer;
176
177 this.activeDraggable.updateDrag(event, pointer);
178 },
179
180 endDrag: function(event) {
181 if(this._timeout) {
182 clearTimeout(this._timeout);
183 this._timeout = null;
184 }
185 if(!this.activeDraggable) return;
186 this._lastPointer = null;
187 this.activeDraggable.endDrag(event);
188 this.activeDraggable = null;
189 },
190
191 keyPress: function(event) {
192 if(this.activeDraggable)
193 this.activeDraggable.keyPress(event);
194 },
195
196 addObserver: function(observer) {
197 this.observers.push(observer);
198 this._cacheObserverCallbacks();
199 },
200
201 removeObserver: function(element) { // element instead of observer fixes mem leaks
202 this.observers = this.observers.reject( function(o) { return o.element==element });
203 this._cacheObserverCallbacks();
204 },
205
206 notify: function(eventName, draggable, event) { // 'onStart', 'onEnd', 'onDrag'
207 if(this[eventName+'Count'] > 0)
208 this.observers.each( function(o) {
209 if(o[eventName]) o[eventName](eventName, draggable, event);
210 });
211 if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
212 },
213
214 _cacheObserverCallbacks: function() {
215 ['onStart','onEnd','onDrag'].each( function(eventName) {
216 Draggables[eventName+'Count'] = Draggables.observers.select(
217 function(o) { return o[eventName]; }
218 ).length;
219 });
220 }
221};
222
223/*--------------------------------------------------------------------------*/
224
225var Draggable = Class.create({
226 initialize: function(element) {
227 var defaults = {
228 handle: false,
229 reverteffect: function(element, top_offset, left_offset) {
230 var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
231 new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
232 queue: {scope:'_draggable', position:'end'}
233 });
234 },
235 endeffect: function(element) {
236 var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;
237 new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity,
238 queue: {scope:'_draggable', position:'end'},
239 afterFinish: function(){
240 Draggable._dragging[element] = false
241 }
242 });
243 },
244 zindex: 1000,
245 revert: false,
246 quiet: false,
247 scroll: false,
248 scrollSensitivity: 20,
249 scrollSpeed: 15,
250 snap: false, // false, or xy or [x,y] or function(x,y){ return [x,y] }
251 delay: 0
252 };
253
254 if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
255 Object.extend(defaults, {
256 starteffect: function(element) {
257 element._opacity = Element.getOpacity(element);
258 Draggable._dragging[element] = true;
259 new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});
260 }
261 });
262
263 var options = Object.extend(defaults, arguments[1] || { });
264
265 this.element = $(element);
266
267 if(options.handle && Object.isString(options.handle))
268 this.handle = this.element.down('.'+options.handle, 0);
269
270 if(!this.handle) this.handle = $(options.handle);
271 if(!this.handle) this.handle = this.element;
272
273 if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
274 options.scroll = $(options.scroll);
275 this._isScrollChild = Element.childOf(this.element, options.scroll);
276 }
277
278 Element.makePositioned(this.element); // fix IE
279
280 this.options = options;
281 this.dragging = false;
282
283 this.eventMouseDown = this.initDrag.bindAsEventListener(this);
284 Event.observe(this.handle, "mousedown", this.eventMouseDown);
285
286 Draggables.register(this);
287 },
288
289 destroy: function() {
290 Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
291 Draggables.unregister(this);
292 },
293
294 currentDelta: function() {
295 return([
296 parseInt(Element.getStyle(this.element,'left') || '0'),
297 parseInt(Element.getStyle(this.element,'top') || '0')]);
298 },
299
300 initDrag: function(event) {
301 if(!Object.isUndefined(Draggable._dragging[this.element]) &&
302 Draggable._dragging[this.element]) return;
303 if(Event.isLeftClick(event)) {
304 // abort on form elements, fixes a Firefox issue
305 var src = Event.element(event);
306 if((tag_name = src.tagName.toUpperCase()) && (
307 tag_name=='INPUT' ||
308 tag_name=='SELECT' ||
309 tag_name=='OPTION' ||
310 tag_name=='BUTTON' ||
311 tag_name=='TEXTAREA')) return;
312
313 var pointer = [Event.pointerX(event), Event.pointerY(event)];
314 var pos = Position.cumulativeOffset(this.element);
315 this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
316
317 Draggables.activate(this);
318 Event.stop(event);
319 }
320 },
321
322 startDrag: function(event) {
323 this.dragging = true;
324 if(!this.delta)
325 this.delta = this.currentDelta();
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 this._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
335 if (!this._originallyAbsolute)
336 Position.absolutize(this.element);
337 this.element.parentNode.insertBefore(this._clone, this.element);
338 }
339
340 if(this.options.scroll) {
341 if (this.options.scroll == window) {
342 var where = this._getWindowScroll(this.options.scroll);
343 this.originalScrollLeft = where.left;
344 this.originalScrollTop = where.top;
345 } else {
346 this.originalScrollLeft = this.options.scroll.scrollLeft;
347 this.originalScrollTop = this.options.scroll.scrollTop;
348 }
349 }
350
351 Draggables.notify('onStart', this, event);
352
353 if(this.options.starteffect) this.options.starteffect(this.element);
354 },
355
356 updateDrag: function(event, pointer) {
357 if(!this.dragging) this.startDrag(event);
358
359 if(!this.options.quiet){
360 Position.prepare();
361 Droppables.show(pointer, this.element);
362 }
363
364 Draggables.notify('onDrag', this, event);
365
366 this.draw(pointer);
367 if(this.options.change) this.options.change(this);
368
369 if(this.options.scroll) {
370 this.stopScrolling();
371
372 var p;
373 if (this.options.scroll == window) {
374 with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
375 } else {
376 p = Position.page(this.options.scroll);
377 p[0] += this.options.scroll.scrollLeft + Position.deltaX;
378 p[1] += this.options.scroll.scrollTop + Position.deltaY;
379 p.push(p[0]+this.options.scroll.offsetWidth);
380 p.push(p[1]+this.options.scroll.offsetHeight);
381 }
382 var speed = [0,0];
383 if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
384 if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
385 if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
386 if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
387 this.startScrolling(speed);
388 }
389
390 // fix AppleWebKit rendering
391 if(Prototype.Browser.WebKit) window.scrollBy(0,0);
392
393 Event.stop(event);
394 },
395
396 finishDrag: function(event, success) {
397 this.dragging = false;
398
399 if(this.options.quiet){
400 Position.prepare();
401 var pointer = [Event.pointerX(event), Event.pointerY(event)];
402 Droppables.show(pointer, this.element);
403 }
404
405 if(this.options.ghosting) {
406 if (!this._originallyAbsolute)
407 Position.relativize(this.element);
408 delete this._originallyAbsolute;
409 Element.remove(this._clone);
410 this._clone = null;
411 }
412
413 var dropped = false;
414 if(success) {
415 dropped = Droppables.fire(event, this.element);
416 if (!dropped) dropped = false;
417 }
418 if(dropped && this.options.onDropped) this.options.onDropped(this.element);
419 Draggables.notify('onEnd', this, event);
420
421 var revert = this.options.revert;
422 if(revert && Object.isFunction(revert)) revert = revert(this.element);
423
424 var d = this.currentDelta();
425 if(revert && this.options.reverteffect) {
426 if (dropped == 0 || revert != 'failure')
427 this.options.reverteffect(this.element,
428 d[1]-this.delta[1], d[0]-this.delta[0]);
429 } else {
430 this.delta = d;
431 }
432
433 if(this.options.zindex)
434 this.element.style.zIndex = this.originalZ;
435
436 if(this.options.endeffect)
437 this.options.endeffect(this.element);
438
439 Draggables.deactivate(this);
440 Droppables.reset();
441 },
442
443 keyPress: function(event) {
444 if(event.keyCode!=Event.KEY_ESC) return;
445 this.finishDrag(event, false);
446 Event.stop(event);
447 },
448
449 endDrag: function(event) {
450 if(!this.dragging) return;
451 this.stopScrolling();
452 this.finishDrag(event, true);
453 Event.stop(event);
454 },
455
456 draw: function(point) {
457 var pos = Position.cumulativeOffset(this.element);
458 if(this.options.ghosting) {
459 var r = Position.realOffset(this.element);
460 pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
461 }
462
463 var d = this.currentDelta();
464 pos[0] -= d[0]; pos[1] -= d[1];
465
466 if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
467 pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
468 pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
469 }
470
471 var p = [0,1].map(function(i){
472 return (point[i]-pos[i]-this.offset[i])
473 }.bind(this));
474
475 if(this.options.snap) {
476 if(Object.isFunction(this.options.snap)) {
477 p = this.options.snap(p[0],p[1],this);
478 } else {
479 if(Object.isArray(this.options.snap)) {
480 p = p.map( function(v, i) {
481 return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this));
482 } else {
483 p = p.map( function(v) {
484 return (v/this.options.snap).round()*this.options.snap }.bind(this));
485 }
486 }}
487
488 var style = this.element.style;
489 if((!this.options.constraint) || (this.options.constraint=='horizontal'))
490 style.left = p[0] + "px";
491 if((!this.options.constraint) || (this.options.constraint=='vertical'))
492 style.top = p[1] + "px";
493
494 if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
495 },
496
497 stopScrolling: function() {
498 if(this.scrollInterval) {
499 clearInterval(this.scrollInterval);
500 this.scrollInterval = null;
501 Draggables._lastScrollPointer = null;
502 }
503 },
504
505 startScrolling: function(speed) {
506 if(!(speed[0] || speed[1])) return;
507 this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
508 this.lastScrolled = new Date();
509 this.scrollInterval = setInterval(this.scroll.bind(this), 10);
510 },
511
512 scroll: function() {
513 var current = new Date();
514 var delta = current - this.lastScrolled;
515 this.lastScrolled = current;
516 if(this.options.scroll == window) {
517 with (this._getWindowScroll(this.options.scroll)) {
518 if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
519 var d = delta / 1000;
520 this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
521 }
522 }
523 } else {
524 this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
525 this.options.scroll.scrollTop += this.scrollSpeed[1] * delta / 1000;
526 }
527
528 Position.prepare();
529 Droppables.show(Draggables._lastPointer, this.element);
530 Draggables.notify('onDrag', this);
531 if (this._isScrollChild) {
532 Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
533 Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
534 Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
535 if (Draggables._lastScrollPointer[0] < 0)
536 Draggables._lastScrollPointer[0] = 0;
537 if (Draggables._lastScrollPointer[1] < 0)
538 Draggables._lastScrollPointer[1] = 0;
539 this.draw(Draggables._lastScrollPointer);
540 }
541
542 if(this.options.change) this.options.change(this);
543 },
544
545 _getWindowScroll: function(w) {
546 var T, L, W, H;
547 with (w.document) {
548 if (w.document.documentElement && documentElement.scrollTop) {
549 T = documentElement.scrollTop;
550 L = documentElement.scrollLeft;
551 } else if (w.document.body) {
552 T = body.scrollTop;
553 L = body.scrollLeft;
554 }
555 if (w.innerWidth) {
556 W = w.innerWidth;
557 H = w.innerHeight;
558 } else if (w.document.documentElement && documentElement.clientWidth) {
559 W = documentElement.clientWidth;
560 H = documentElement.clientHeight;
561 } else {
562 W = body.offsetWidth;
563 H = body.offsetHeight;
564 }
565 }
566 return { top: T, left: L, width: W, height: H };
567 }
568});
569
570Draggable._dragging = { };
571
572/*--------------------------------------------------------------------------*/
573
574var SortableObserver = Class.create({
575 initialize: function(element, observer) {
576 this.element = $(element);
577 this.observer = observer;
578 this.lastValue = Sortable.serialize(this.element);
579 },
580
581 onStart: function() {
582 this.lastValue = Sortable.serialize(this.element);
583 },
584
585 onEnd: function() {
586 Sortable.unmark();
587 if(this.lastValue != Sortable.serialize(this.element))
588 this.observer(this.element)
589 }
590});
591
592var Sortable = {
593 SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
594
595 sortables: { },
596
597 _findRootElement: function(element) {
598 while (element.tagName.toUpperCase() != "BODY") {
599 if(element.id && Sortable.sortables[element.id]) return element;
600 element = element.parentNode;
601 }
602 },
603
604 options: function(element) {
605 element = Sortable._findRootElement($(element));
606 if(!element) return;
607 return Sortable.sortables[element.id];
608 },
609
610 destroy: function(element){
611 element = $(element);
612 var s = Sortable.sortables[element.id];
613
614 if(s) {
615 Draggables.removeObserver(s.element);
616 s.droppables.each(function(d){ Droppables.remove(d) });
617 s.draggables.invoke('destroy');
618
619 delete Sortable.sortables[s.element.id];
620 }
621 },
622
623 create: function(element) {
624 element = $(element);
625 var options = Object.extend({
626 element: element,
627 tag: 'li', // assumes li children, override with tag: 'tagname'
628 dropOnEmpty: false,
629 tree: false,
630 treeTag: 'ul',
631 overlap: 'vertical', // one of 'vertical', 'horizontal'
632 constraint: 'vertical', // one of 'vertical', 'horizontal', false
633 containment: element, // also takes array of elements (or id's); or false
634 handle: false, // or a CSS class
635 only: false,
636 delay: 0,
637 hoverclass: null,
638 ghosting: false,
639 quiet: false,
640 scroll: false,
641 scrollSensitivity: 20,
642 scrollSpeed: 15,
643 format: this.SERIALIZE_RULE,
644
645 // these take arrays of elements or ids and can be
646 // used for better initialization performance
647 elements: false,
648 handles: false,
649
650 onChange: Prototype.emptyFunction,
651 onUpdate: Prototype.emptyFunction
652 }, arguments[1] || { });
653
654 // clear any old sortable with same element
655 this.destroy(element);
656
657 // build options for the draggables
658 var options_for_draggable = {
659 revert: true,
660 quiet: options.quiet,
661 scroll: options.scroll,
662 scrollSpeed: options.scrollSpeed,
663 scrollSensitivity: options.scrollSensitivity,
664 delay: options.delay,
665 ghosting: options.ghosting,
666 constraint: options.constraint,
667 handle: options.handle };
668
669 if(options.starteffect)
670 options_for_draggable.starteffect = options.starteffect;
671
672 if(options.reverteffect)
673 options_for_draggable.reverteffect = options.reverteffect;
674 else
675 if(options.ghosting) options_for_draggable.reverteffect = function(element) {
676 element.style.top = 0;
677 element.style.left = 0;
678 };
679
680 if(options.endeffect)
681 options_for_draggable.endeffect = options.endeffect;
682
683 if(options.zindex)
684 options_for_draggable.zindex = options.zindex;
685
686 // build options for the droppables
687 var options_for_droppable = {
688 overlap: options.overlap,
689 containment: options.containment,
690 tree: options.tree,
691 hoverclass: options.hoverclass,
692 onHover: Sortable.onHover
693 };
694
695 var options_for_tree = {
696 onHover: Sortable.onEmptyHover,
697 overlap: options.overlap,
698 containment: options.containment,
699 hoverclass: options.hoverclass
700 };
701
702 // fix for gecko engine
703 Element.cleanWhitespace(element);
704
705 options.draggables = [];
706 options.droppables = [];
707
708 // drop on empty handling
709 if(options.dropOnEmpty || options.tree) {
710 Droppables.add(element, options_for_tree);
711 options.droppables.push(element);
712 }
713
714 (options.elements || this.findElements(element, options) || []).each( function(e,i) {
715 var handle = options.handles ? $(options.handles[i]) :
716 (options.handle ? $(e).select('.' + options.handle)[0] : e);
717 options.draggables.push(
718 new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
719 Droppables.add(e, options_for_droppable);
720 if(options.tree) e.treeNode = element;
721 options.droppables.push(e);
722 });
723
724 if(options.tree) {
725 (Sortable.findTreeElements(element, options) || []).each( function(e) {
726 Droppables.add(e, options_for_tree);
727 e.treeNode = element;
728 options.droppables.push(e);
729 });
730 }
731
732 // keep reference
733 this.sortables[element.id] = options;
734
735 // for onupdate
736 Draggables.addObserver(new SortableObserver(element, options.onUpdate));
737
738 },
739
740 // return all suitable-for-sortable elements in a guaranteed order
741 findElements: function(element, options) {
742 return Element.findChildren(
743 element, options.only, options.tree ? true : false, options.tag);
744 },
745
746 findTreeElements: function(element, options) {
747 return Element.findChildren(
748 element, options.only, options.tree ? true : false, options.treeTag);
749 },
750
751 onHover: function(element, dropon, overlap) {
752 if(Element.isParent(dropon, element)) return;
753
754 if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
755 return;
756 } else if(overlap>0.5) {
757 Sortable.mark(dropon, 'before');
758 if(dropon.previousSibling != element) {
759 var oldParentNode = element.parentNode;
760 element.style.visibility = "hidden"; // fix gecko rendering
761 dropon.parentNode.insertBefore(element, dropon);
762 if(dropon.parentNode!=oldParentNode)
763 Sortable.options(oldParentNode).onChange(element);
764 Sortable.options(dropon.parentNode).onChange(element);
765 }
766 } else {
767 Sortable.mark(dropon, 'after');
768 var nextElement = dropon.nextSibling || null;
769 if(nextElement != element) {
770 var oldParentNode = element.parentNode;
771 element.style.visibility = "hidden"; // fix gecko rendering
772 dropon.parentNode.insertBefore(element, nextElement);
773 if(dropon.parentNode!=oldParentNode)
774 Sortable.options(oldParentNode).onChange(element);
775 Sortable.options(dropon.parentNode).onChange(element);
776 }
777 }
778 },
779
780 onEmptyHover: function(element, dropon, overlap) {
781 var oldParentNode = element.parentNode;
782 var droponOptions = Sortable.options(dropon);
783
784 if(!Element.isParent(dropon, element)) {
785 var index;
786
787 var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
788 var child = null;
789
790 if(children) {
791 var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
792
793 for (index = 0; index < children.length; index += 1) {
794 if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
795 offset -= Element.offsetSize (children[index], droponOptions.overlap);
796 } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
797 child = index + 1 < children.length ? children[index + 1] : null;
798 break;
799 } else {
800 child = children[index];
801 break;
802 }
803 }
804 }
805
806 dropon.insertBefore(element, child);
807
808 Sortable.options(oldParentNode).onChange(element);
809 droponOptions.onChange(element);
810 }
811 },
812
813 unmark: function() {
814 if(Sortable._marker) Sortable._marker.hide();
815 },
816
817 mark: function(dropon, position) {
818 // mark on ghosting only
819 var sortable = Sortable.options(dropon.parentNode);
820 if(sortable && !sortable.ghosting) return;
821
822 if(!Sortable._marker) {
823 Sortable._marker =
824 ($('dropmarker') || Element.extend(document.createElement('DIV'))).
825 hide().addClassName('dropmarker').setStyle({position:'absolute'});
826 document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
827 }
828 var offsets = Position.cumulativeOffset(dropon);
829 Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
830
831 if(position=='after')
832 if(sortable.overlap == 'horizontal')
833 Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
834 else
835 Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
836
837 Sortable._marker.show();
838 },
839
840 _tree: function(element, options, parent) {
841 var children = Sortable.findElements(element, options) || [];
842
843 for (var i = 0; i < children.length; ++i) {
844 var match = children[i].id.match(options.format);
845
846 if (!match) continue;
847
848 var child = {
849 id: encodeURIComponent(match ? match[1] : null),
850 element: element,
851 parent: parent,
852 children: [],
853 position: parent.children.length,
854 container: $(children[i]).down(options.treeTag)
855 };
856
857 /* Get the element containing the children and recurse over it */
858 if (child.container)
859 this._tree(child.container, options, child);
860
861 parent.children.push (child);
862 }
863
864 return parent;
865 },
866
867 tree: function(element) {
868 element = $(element);
869 var sortableOptions = this.options(element);
870 var options = Object.extend({
871 tag: sortableOptions.tag,
872 treeTag: sortableOptions.treeTag,
873 only: sortableOptions.only,
874 name: element.id,
875 format: sortableOptions.format
876 }, arguments[1] || { });
877
878 var root = {
879 id: null,
880 parent: null,
881 children: [],
882 container: element,
883 position: 0
884 };
885
886 return Sortable._tree(element, options, root);
887 },
888
889 /* Construct a [i] index for a particular node */
890 _constructIndex: function(node) {
891 var index = '';
892 do {
893 if (node.id) index = '[' + node.position + ']' + index;
894 } while ((node = node.parent) != null);
895 return index;
896 },
897
898 sequence: function(element) {
899 element = $(element);
900 var options = Object.extend(this.options(element), arguments[1] || { });
901
902 return $(this.findElements(element, options) || []).map( function(item) {
903 return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
904 });
905 },
906
907 setSequence: function(element, new_sequence) {
908 element = $(element);
909 var options = Object.extend(this.options(element), arguments[2] || { });
910
911 var nodeMap = { };
912 this.findElements(element, options).each( function(n) {
913 if (n.id.match(options.format))
914 nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
915 n.parentNode.removeChild(n);
916 });
917
918 new_sequence.each(function(ident) {
919 var n = nodeMap[ident];
920 if (n) {
921 n[1].appendChild(n[0]);
922 delete nodeMap[ident];
923 }
924 });
925 },
926
927 serialize: function(element) {
928 element = $(element);
929 var options = Object.extend(Sortable.options(element), arguments[1] || { });
930 var name = encodeURIComponent(
931 (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
932
933 if (options.tree) {
934 return Sortable.tree(element, arguments[1]).children.map( function (item) {
935 return [name + Sortable._constructIndex(item) + "[id]=" +
936 encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
937 }).flatten().join('&');
938 } else {
939 return Sortable.sequence(element, arguments[1]).map( function(item) {
940 return name + "[]=" + encodeURIComponent(item);
941 }).join('&');
942 }
943 }
944};
945
946// Returns true if child is contained within element
947Element.isParent = function(child, element) {
948 if (!child.parentNode || child == element) return false;
949 if (child.parentNode == element) return true;
950 return Element.isParent(child.parentNode, element);
951};
952
953Element.findChildren = function(element, only, recursive, tagName) {
954 if(!element.hasChildNodes()) return null;
955 tagName = tagName.toUpperCase();
956 if(only) only = [only].flatten();
957 var elements = [];
958 $A(element.childNodes).each( function(e) {
959 if(e.tagName && e.tagName.toUpperCase()==tagName &&
960 (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
961 elements.push(e);
962 if(recursive) {
963 var grandchildren = Element.findChildren(e, only, recursive, tagName);
964 if(grandchildren) elements.push(grandchildren);
965 }
966 });
967
968 return (elements.length>0 ? elements.flatten() : []);
969};
970
971Element.offsetSize = function (element, type) {
972 return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
973};
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