include/scriptaculous/src/dragdrop.js
// script.aculo.us dragdrop.js v1.6.4, Wed Sep 06 11:30:58 CEST 2006
// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// (c) 2005 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
//
// See scriptaculous.js for full license.
/*--------------------------------------------------------------------------*/
if (typeof Effect == 'undefined')
throw("dragdrop.js requires including script.aculo.us' effects.js library");
var Droppables = {
drops: [],
remove: function (element) {
this.drops = this.drops.reject(function (d) {
return d.element == $(element)
});
},
add: function (element) {
element = $(element);
var options = Object.extend({
greedy: true,
hoverclass: null,
tree: false
}, arguments[1] || {});
// cache containers
if (options.containment) {
options._containers = [];
var containment = options.containment;
if ((typeof containment == 'object') &&
(containment.constructor == Array)) {
containment.each(function (c) {
options._containers.push($(c))
});
} else {
options._containers.push($(containment));
}
}
if (options.accept) options.accept = [options.accept].flatten();
Element.makePositioned(element); // fix IE
options.element = element;
this.drops.push(options);
},
findDeepestChild: function (drops) {
deepest = drops[0];
for (i = 1; i < drops.length; ++i)
if (Element.isParent(drops[i].element, deepest.element))
deepest = drops[i];
return deepest;
},
isContained: function (element, drop) {
var containmentNode;
if (drop.tree) {
containmentNode = element.treeNode;
} else {
containmentNode = element.parentNode;
}
return drop._containers.detect(function (c) {
return containmentNode == c
});
},
isAffected: function (point, element, drop) {
return (
(drop.element != element) &&
((!drop._containers) ||
this.isContained(element, drop)) &&
((!drop.accept) ||
(Element.classNames(element).detect(
function (v) {
return drop.accept.include(v)
}) )) &&
Position.within(drop.element, point[0], point[1]) );
},
deactivate: function (drop) {
if (drop.hoverclass)
Element.removeClassName(drop.element, drop.hoverclass);
this.last_active = null;
},
activate: function (drop) {
if (drop.hoverclass)
Element.addClassName(drop.element, drop.hoverclass);
this.last_active = drop;
},
show: function (point, element) {
if (!this.drops.length) return;
var affected = [];
if (this.last_active) this.deactivate(this.last_active);
this.drops.each(function (drop) {
if (Droppables.isAffected(point, element, drop))
affected.push(drop);
});
if (affected.length > 0) {
drop = Droppables.findDeepestChild(affected);
Position.within(drop.element, point[0], point[1]);
if (drop.onHover)
drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
Droppables.activate(drop);
}
},
fire: function (event, element) {
if (!this.last_active) return;
Position.prepare();
if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
if (this.last_active.onDrop)
this.last_active.onDrop(element, this.last_active.element, event);
},
reset: function () {
if (this.last_active)
this.deactivate(this.last_active);
}
}
var Draggables = {
drags: [],
observers: [],
register: function (draggable) {
if (this.drags.length == 0) {
this.eventMouseUp = this.endDrag.bindAsEventListener(this);
this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
this.eventKeypress = this.keyPress.bindAsEventListener(this);
Event.observe(document, "mouseup", this.eventMouseUp);
Event.observe(document, "mousemove", this.eventMouseMove);
Event.observe(document, "keypress", this.eventKeypress);
}
this.drags.push(draggable);
},
unregister: function (draggable) {
this.drags = this.drags.reject(function (d) {
return d == draggable
});
if (this.drags.length == 0) {
Event.stopObserving(document, "mouseup", this.eventMouseUp);
Event.stopObserving(document, "mousemove", this.eventMouseMove);
Event.stopObserving(document, "keypress", this.eventKeypress);
}
},
activate: function (draggable) {
if (draggable.options.delay) {
this._timeout = setTimeout(function () {
Draggables._timeout = null;
window.focus();
Draggables.activeDraggable = draggable;
}.bind(this), draggable.options.delay);
} else {
window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
this.activeDraggable = draggable;
}
},
deactivate: function () {
this.activeDraggable = null;
},
updateDrag: function (event) {
if (!this.activeDraggable) return;
var pointer = [Event.pointerX(event), Event.pointerY(event)];
// Mozilla-based browsers fire successive mousemove events with
// the same coordinates, prevent needless redrawing (moz bug?)
if (this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
this._lastPointer = pointer;
this.activeDraggable.updateDrag(event, pointer);
},
endDrag: function (event) {
if (this._timeout) {
clearTimeout(this._timeout);
this._timeout = null;
}
if (!this.activeDraggable) return;
this._lastPointer = null;
this.activeDraggable.endDrag(event);
this.activeDraggable = null;
},
keyPress: function (event) {
if (this.activeDraggable)
this.activeDraggable.keyPress(event);
},
addObserver: function (observer) {
this.observers.push(observer);
this._cacheObserverCallbacks();
},
removeObserver: function (element) { // element instead of observer fixes mem leaks
this.observers = this.observers.reject(function (o) {
return o.element == element
});
this._cacheObserverCallbacks();
},
notify: function (eventName, draggable, event) { // 'onStart', 'onEnd', 'onDrag'
if (this[eventName + 'Count'] > 0)
this.observers.each(function (o) {
if (o[eventName]) o[eventName](eventName, draggable, event);
});
if (draggable.options[eventName]) draggable.options[eventName](draggable, event);
},
_cacheObserverCallbacks: function () {
['onStart', 'onEnd', 'onDrag'].each(function (eventName) {
Draggables[eventName + 'Count'] = Draggables.observers.select(
function (o) {
return o[eventName];
}
).length;
});
}
}
/*--------------------------------------------------------------------------*/
var Draggable = Class.create();
Draggable._dragging = {};
Draggable.prototype = {
initialize: function (element) {
var defaults = {
handle: false,
reverteffect: function (element, top_offset, left_offset) {
var dur = Math.sqrt(Math.abs(top_offset ^ 2) + Math.abs(left_offset ^ 2)) * 0.02;
new Effect.Move(element, {
x: -left_offset, y: -top_offset, duration: dur,
queue: {scope: '_draggable', position: 'end'}
});
},
endeffect: function (element) {
var toOpacity = typeof element._opacity == 'number' ? element._opacity : 1.0;
new Effect.Opacity(element, {
duration: 0.2, from: 0.7, to: toOpacity,
queue: {scope: '_draggable', position: 'end'},
afterFinish: function () {
Draggable._dragging[element] = false
}
});
},
zindex: 1000,
revert: false,
scroll: false,
scrollSensitivity: 20,
scrollSpeed: 15,
snap: false, // false, or xy or [x,y] or function(x,y){ return [x,y] }
delay: 0
};
if (arguments[1] && typeof arguments[1].endeffect == 'undefined')
Object.extend(defaults, {
starteffect: function (element) {
element._opacity = Element.getOpacity(element);
Draggable._dragging[element] = true;
new Effect.Opacity(element, {duration: 0.2, from: element._opacity, to: 0.7});
}
});
var options = Object.extend(defaults, arguments[1] || {});
this.element = $(element);
if (options.handle && (typeof options.handle == 'string')) {
var h = Element.childrenWithClassName(this.element, options.handle, true);
if (h.length > 0) this.handle = h[0];
}
if (!this.handle) this.handle = $(options.handle);
if (!this.handle) this.handle = this.element;
if (options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
options.scroll = $(options.scroll);
this._isScrollChild = Element.childOf(this.element, options.scroll);
}
Element.makePositioned(this.element); // fix IE
this.delta = this.currentDelta();
this.options = options;
this.dragging = false;
this.eventMouseDown = this.initDrag.bindAsEventListener(this);
Event.observe(this.handle, "mousedown", this.eventMouseDown);
Draggables.register(this);
},
destroy: function () {
Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
Draggables.unregister(this);
},
currentDelta: function () {
return ([
parseInt(Element.getStyle(this.element, 'left') || '0'),
parseInt(Element.getStyle(this.element, 'top') || '0')]);
},
initDrag: function (event) {
if (typeof Draggable._dragging[this.element] != 'undefined' &&
Draggable._dragging[this.element]) return;
if (Event.isLeftClick(event)) {
// abort on form elements, fixes a Firefox issue
var src = Event.element(event);
if (src.tagName && (
src.tagName == 'INPUT' ||
src.tagName == 'SELECT' ||
src.tagName == 'OPTION' ||
src.tagName == 'BUTTON' ||
src.tagName == 'TEXTAREA')) return;
var pointer = [Event.pointerX(event), Event.pointerY(event)];
var pos = Position.cumulativeOffset(this.element);
this.offset = [0, 1].map(function (i) {
return (pointer[i] - pos[i])
});
Draggables.activate(this);
Event.stop(event);
}
},
startDrag: function (event) {
this.dragging = true;
if (this.options.zindex) {
this.originalZ = parseInt(Element.getStyle(this.element, 'z-index') || 0);
this.element.style.zIndex = this.options.zindex;
}
if (this.options.ghosting) {
this._clone = this.element.cloneNode(true);
Position.absolutize(this.element);
this.element.parentNode.insertBefore(this._clone, this.element);
}
if (this.options.scroll) {
if (this.options.scroll == window) {
var where = this._getWindowScroll(this.options.scroll);
this.originalScrollLeft = where.left;
this.originalScrollTop = where.top;
} else {
this.originalScrollLeft = this.options.scroll.scrollLeft;
this.originalScrollTop = this.options.scroll.scrollTop;
}
}
Draggables.notify('onStart', this, event);
if (this.options.starteffect) this.options.starteffect(this.element);
},
updateDrag: function (event, pointer) {
if (!this.dragging) this.startDrag(event);
Position.prepare();
Droppables.show(pointer, this.element);
Draggables.notify('onDrag', this, event);
this.draw(pointer);
if (this.options.change) this.options.change(this);
if (this.options.scroll) {
this.stopScrolling();
var p;
if (this.options.scroll == window) {
with (this._getWindowScroll(this.options.scroll)) {
p = [left, top, left + width, top + height];
}
} else {
p = Position.page(this.options.scroll);
p[0] += this.options.scroll.scrollLeft;
p[1] += this.options.scroll.scrollTop;
p[0] += (window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0);
p[1] += (window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0);
p.push(p[0] + this.options.scroll.offsetWidth);
p.push(p[1] + this.options.scroll.offsetHeight);
}
var speed = [0, 0];
if (pointer[0] < (p[0] + this.options.scrollSensitivity)) speed[0] = pointer[0] - (p[0] + this.options.scrollSensitivity);
if (pointer[1] < (p[1] + this.options.scrollSensitivity)) speed[1] = pointer[1] - (p[1] + this.options.scrollSensitivity);
if (pointer[0] > (p[2] - this.options.scrollSensitivity)) speed[0] = pointer[0] - (p[2] - this.options.scrollSensitivity);
if (pointer[1] > (p[3] - this.options.scrollSensitivity)) speed[1] = pointer[1] - (p[3] - this.options.scrollSensitivity);
this.startScrolling(speed);
}
// fix AppleWebKit rendering
if (navigator.appVersion.indexOf('AppleWebKit') > 0) window.scrollBy(0, 0);
Event.stop(event);
},
finishDrag: function (event, success) {
this.dragging = false;
if (this.options.ghosting) {
Position.relativize(this.element);
Element.remove(this._clone);
this._clone = null;
}
if (success) Droppables.fire(event, this.element);
Draggables.notify('onEnd', this, event);
var revert = this.options.revert;
if (revert && typeof revert == 'function') revert = revert(this.element);
var d = this.currentDelta();
if (revert && this.options.reverteffect) {
this.options.reverteffect(this.element,
d[1] - this.delta[1], d[0] - this.delta[0]);
} else {
this.delta = d;
}
if (this.options.zindex)
this.element.style.zIndex = this.originalZ;
if (this.options.endeffect)
this.options.endeffect(this.element);
Draggables.deactivate(this);
Droppables.reset();
},
keyPress: function (event) {
if (event.keyCode != Event.KEY_ESC) return;
this.finishDrag(event, false);
Event.stop(event);
},
endDrag: function (event) {
if (!this.dragging) return;
this.stopScrolling();
this.finishDrag(event, true);
Event.stop(event);
},
draw: function (point) {
var pos = Position.cumulativeOffset(this.element);
if (this.options.ghosting) {
var r = Position.realOffset(this.element);
window.status = r.inspect();
pos[0] += r[0] - Position.deltaX;
pos[1] += r[1] - Position.deltaY;
}
var d = this.currentDelta();
pos[0] -= d[0];
pos[1] -= d[1];
if (this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
pos[0] -= this.options.scroll.scrollLeft - this.originalScrollLeft;
pos[1] -= this.options.scroll.scrollTop - this.originalScrollTop;
}
var p = [0, 1].map(function (i) {
return (point[i] - pos[i] - this.offset[i])
}.bind(this));
if (this.options.snap) {
if (typeof this.options.snap == 'function') {
p = this.options.snap(p[0], p[1], this);
} else {
if (this.options.snap instanceof Array) {
p = p.map(function (v, i) {
return Math.round(v / this.options.snap[i]) * this.options.snap[i]
}.bind(this))
} else {
p = p.map(function (v) {
return Math.round(v / this.options.snap) * this.options.snap
}.bind(this))
}
}
}
var style = this.element.style;
if ((!this.options.constraint) || (this.options.constraint == 'horizontal'))
style.left = p[0] + "px";
if ((!this.options.constraint) || (this.options.constraint == 'vertical'))
style.top = p[1] + "px";
if (style.visibility == "hidden") style.visibility = ""; // fix gecko rendering
},
stopScrolling: function () {
if (this.scrollInterval) {
clearInterval(this.scrollInterval);
this.scrollInterval = null;
Draggables._lastScrollPointer = null;
}
},
startScrolling: function (speed) {
if (!(speed[0] || speed[1])) return;
this.scrollSpeed = [speed[0] * this.options.scrollSpeed, speed[1] * this.options.scrollSpeed];
this.lastScrolled = new Date();
this.scrollInterval = setInterval(this.scroll.bind(this), 10);
},
scroll: function () {
var current = new Date();
var delta = current - this.lastScrolled;
this.lastScrolled = current;
if (this.options.scroll == window) {
with (this._getWindowScroll(this.options.scroll)) {
if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
var d = delta / 1000;
this.options.scroll.scrollTo(left + d * this.scrollSpeed[0], top + d * this.scrollSpeed[1]);
}
}
} else {
this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
this.options.scroll.scrollTop += this.scrollSpeed[1] * delta / 1000;
}
Position.prepare();
Droppables.show(Draggables._lastPointer, this.element);
Draggables.notify('onDrag', this);
if (this._isScrollChild) {
Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
if (Draggables._lastScrollPointer[0] < 0)
Draggables._lastScrollPointer[0] = 0;
if (Draggables._lastScrollPointer[1] < 0)
Draggables._lastScrollPointer[1] = 0;
this.draw(Draggables._lastScrollPointer);
}
if (this.options.change) this.options.change(this);
},
_getWindowScroll: function (w) {
var T, L, W, H;
with (w.document) {
if (w.document.documentElement && documentElement.scrollTop) {
T = documentElement.scrollTop;
L = documentElement.scrollLeft;
} else if (w.document.body) {
T = body.scrollTop;
L = body.scrollLeft;
}
if (w.innerWidth) {
W = w.innerWidth;
H = w.innerHeight;
} else if (w.document.documentElement && documentElement.clientWidth) {
W = documentElement.clientWidth;
H = documentElement.clientHeight;
} else {
W = body.offsetWidth;
H = body.offsetHeight
}
}
return {top: T, left: L, width: W, height: H};
}
}
/*--------------------------------------------------------------------------*/
var SortableObserver = Class.create();
SortableObserver.prototype = {
initialize: function (element, observer) {
this.element = $(element);
this.observer = observer;
this.lastValue = Sortable.serialize(this.element);
},
onStart: function () {
this.lastValue = Sortable.serialize(this.element);
},
onEnd: function () {
Sortable.unmark();
if (this.lastValue != Sortable.serialize(this.element))
this.observer(this.element)
}
}
var Sortable = {
SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
sortables: {},
_findRootElement: function (element) {
while (element.tagName != "BODY") {
if (element.id && Sortable.sortables[element.id]) return element;
element = element.parentNode;
}
},
options: function (element) {
element = Sortable._findRootElement($(element));
if (!element) return;
return Sortable.sortables[element.id];
},
destroy: function (element) {
var s = Sortable.options(element);
if (s) {
Draggables.removeObserver(s.element);
s.droppables.each(function (d) {
Droppables.remove(d)
});
s.draggables.invoke('destroy');
delete Sortable.sortables[s.element.id];
}
},
create: function (element) {
element = $(element);
var options = Object.extend({
element: element,
tag: 'li', // assumes li children, override with tag: 'tagname'
dropOnEmpty: false,
tree: false,
treeTag: 'ul',
overlap: 'vertical', // one of 'vertical', 'horizontal'
constraint: 'vertical', // one of 'vertical', 'horizontal', false
containment: element, // also takes array of elements (or id's); or false
handle: false, // or a CSS class
only: false,
delay: 0,
hoverclass: null,
ghosting: false,
scroll: false,
scrollSensitivity: 20,
scrollSpeed: 15,
format: this.SERIALIZE_RULE,
onChange: Prototype.emptyFunction,
onUpdate: Prototype.emptyFunction
}, arguments[1] || {});
// clear any old sortable with same element
this.destroy(element);
// build options for the draggables
var options_for_draggable = {
revert: true,
scroll: options.scroll,
scrollSpeed: options.scrollSpeed,
scrollSensitivity: options.scrollSensitivity,
delay: options.delay,
ghosting: options.ghosting,
constraint: options.constraint,
handle: options.handle
};
if (options.starteffect)
options_for_draggable.starteffect = options.starteffect;
if (options.reverteffect)
options_for_draggable.reverteffect = options.reverteffect;
else if (options.ghosting) options_for_draggable.reverteffect = function (element) {
element.style.top = 0;
element.style.left = 0;
};
if (options.endeffect)
options_for_draggable.endeffect = options.endeffect;
if (options.zindex)
options_for_draggable.zindex = options.zindex;
// build options for the droppables
var options_for_droppable = {
overlap: options.overlap,
containment: options.containment,
tree: options.tree,
hoverclass: options.hoverclass,
onHover: Sortable.onHover
//greedy: !options.dropOnEmpty
}
var options_for_tree = {
onHover: Sortable.onEmptyHover,
overlap: options.overlap,
containment: options.containment,
hoverclass: options.hoverclass
}
// fix for gecko engine
Element.cleanWhitespace(element);
options.draggables = [];
options.droppables = [];
// drop on empty handling
if (options.dropOnEmpty || options.tree) {
Droppables.add(element, options_for_tree);
options.droppables.push(element);
}
(this.findElements(element, options) || []).each(function (e) {
// handles are per-draggable
var handle = options.handle ?
Element.childrenWithClassName(e, options.handle)[0] : e;
options.draggables.push(
new Draggable(e, Object.extend(options_for_draggable, {handle: handle})));
Droppables.add(e, options_for_droppable);
if (options.tree) e.treeNode = element;
options.droppables.push(e);
});
if (options.tree) {
(Sortable.findTreeElements(element, options) || []).each(function (e) {
Droppables.add(e, options_for_tree);
e.treeNode = element;
options.droppables.push(e);
});
}
// keep reference
this.sortables[element.id] = options;
// for onupdate
Draggables.addObserver(new SortableObserver(element, options.onUpdate));
},
// return all suitable-for-sortable elements in a guaranteed order
findElements: function (element, options) {
return Element.findChildren(
element, options.only, options.tree ? true : false, options.tag);
},
findTreeElements: function (element, options) {
return Element.findChildren(
element, options.only, options.tree ? true : false, options.treeTag);
},
onHover: function (element, dropon, overlap) {
if (Element.isParent(dropon, element)) return;
if (overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
return;
} else if (overlap > 0.5) {
Sortable.mark(dropon, 'before');
if (dropon.previousSibling != element) {
var oldParentNode = element.parentNode;
element.style.visibility = "hidden"; // fix gecko rendering
dropon.parentNode.insertBefore(element, dropon);
if (dropon.parentNode != oldParentNode)
Sortable.options(oldParentNode).onChange(element);
Sortable.options(dropon.parentNode).onChange(element);
}
} else {
Sortable.mark(dropon, 'after');
var nextElement = dropon.nextSibling || null;
if (nextElement != element) {
var oldParentNode = element.parentNode;
element.style.visibility = "hidden"; // fix gecko rendering
dropon.parentNode.insertBefore(element, nextElement);
if (dropon.parentNode != oldParentNode)
Sortable.options(oldParentNode).onChange(element);
Sortable.options(dropon.parentNode).onChange(element);
}
}
},
onEmptyHover: function (element, dropon, overlap) {
var oldParentNode = element.parentNode;
var droponOptions = Sortable.options(dropon);
if (!Element.isParent(dropon, element)) {
var index;
var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
var child = null;
if (children) {
var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
for (index = 0; index < children.length; index += 1) {
if (offset - Element.offsetSize(children[index], droponOptions.overlap) >= 0) {
offset -= Element.offsetSize(children[index], droponOptions.overlap);
} else if (offset - (Element.offsetSize(children[index], droponOptions.overlap) / 2) >= 0) {
child = index + 1 < children.length ? children[index + 1] : null;
break;
} else {
child = children[index];
break;
}
}
}
dropon.insertBefore(element, child);
Sortable.options(oldParentNode).onChange(element);
droponOptions.onChange(element);
}
},
unmark: function () {
if (Sortable._marker) Element.hide(Sortable._marker);
},
mark: function (dropon, position) {
// mark on ghosting only
var sortable = Sortable.options(dropon.parentNode);
if (sortable && !sortable.ghosting) return;
if (!Sortable._marker) {
Sortable._marker = $('dropmarker') || document.createElement('DIV');
Element.hide(Sortable._marker);
Element.addClassName(Sortable._marker, 'dropmarker');
Sortable._marker.style.position = 'absolute';
document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
}
var offsets = Position.cumulativeOffset(dropon);
Sortable._marker.style.left = offsets[0] + 'px';
Sortable._marker.style.top = offsets[1] + 'px';
if (position == 'after')
if (sortable.overlap == 'horizontal')
Sortable._marker.style.left = (offsets[0] + dropon.clientWidth) + 'px';
else
Sortable._marker.style.top = (offsets[1] + dropon.clientHeight) + 'px';
Element.show(Sortable._marker);
},
_tree: function (element, options, parent) {
var children = Sortable.findElements(element, options) || [];
for (var i = 0; i < children.length; ++i) {
var match = children[i].id.match(options.format);
if (!match) continue;
var child = {
id: encodeURIComponent(match ? match[1] : null),
element: element,
parent: parent,
children: new Array,
position: parent.children.length,
container: Sortable._findChildrenElement(children[i], options.treeTag.toUpperCase())
}
/* Get the element containing the children and recurse over it */
if (child.container)
this._tree(child.container, options, child)
parent.children.push(child);
}
return parent;
},
/* Finds the first element of the given tag type within a parent element.
Used for finding the first LI[ST] within a L[IST]I[TEM].*/
_findChildrenElement: function (element, containerTag) {
if (element && element.hasChildNodes)
for (var i = 0; i < element.childNodes.length; ++i)
if (element.childNodes[i].tagName == containerTag)
return element.childNodes[i];
return null;
},
tree: function (element) {
element = $(element);
var sortableOptions = this.options(element);
var options = Object.extend({
tag: sortableOptions.tag,
treeTag: sortableOptions.treeTag,
only: sortableOptions.only,
name: element.id,
format: sortableOptions.format
}, arguments[1] || {});
var root = {
id: null,
parent: null,
children: new Array,
container: element,
position: 0
}
return Sortable._tree(element, options, root);
},
/* Construct a [i] index for a particular node */
_constructIndex: function (node) {
var index = '';
do {
if (node.id) index = '[' + node.position + ']' + index;
} while ((node = node.parent) != null);
return index;
},
sequence: function (element) {
element = $(element);
var options = Object.extend(this.options(element), arguments[1] || {});
return $(this.findElements(element, options) || []).map(function (item) {
return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
});
},
setSequence: function (element, new_sequence) {
element = $(element);
var options = Object.extend(this.options(element), arguments[2] || {});
var nodeMap = {};
this.findElements(element, options).each(function (n) {
if (n.id.match(options.format))
nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
n.parentNode.removeChild(n);
});
new_sequence.each(function (ident) {
var n = nodeMap[ident];
if (n) {
n[1].appendChild(n[0]);
delete nodeMap[ident];
}
});
},
serialize: function (element) {
element = $(element);
var options = Object.extend(Sortable.options(element), arguments[1] || {});
var name = encodeURIComponent(
(arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
if (options.tree) {
return Sortable.tree(element, arguments[1]).children.map(function (item) {
return [name + Sortable._constructIndex(item) + "[id]=" +
encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
}).flatten().join('&');
} else {
return Sortable.sequence(element, arguments[1]).map(function (item) {
return name + "[]=" + encodeURIComponent(item);
}).join('&');
}
}
}
/* Returns true if child is contained within element */
Element.isParent = function (child, element) {
if (!child.parentNode || child == element) return false;
if (child.parentNode == element) return true;
return Element.isParent(child.parentNode, element);
}
Element.findChildren = function (element, only, recursive, tagName) {
if (!element.hasChildNodes()) return null;
tagName = tagName.toUpperCase();
if (only) only = [only].flatten();
var elements = [];
$A(element.childNodes).each(function (e) {
if (e.tagName && e.tagName.toUpperCase() == tagName &&
(!only || (Element.classNames(e).detect(function (v) {
return only.include(v)
}))))
elements.push(e);
if (recursive) {
var grandchildren = Element.findChildren(e, only, recursive, tagName);
if (grandchildren) elements.push(grandchildren);
}
});
return (elements.length > 0 ? elements.flatten() : []);
}
Element.offsetSize = function (element, type) {
if (type == 'vertical' || type == 'height')
return element.offsetHeight;
else
return element.offsetWidth;
}