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+// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
+//
+// Element.Class part Copyright (c) 2005 by Rick Olson
+//
+// See scriptaculous.js for full license.
+
+/*--------------------------------------------------------------------------*/
+
+var Droppables = {
+ drops: [],
+
+ remove: function(element) {
+ this.drops = this.drops.reject(function(d) { return d.element==element });
+ },
+
+ add: function(element) {
+ element = $(element);
+ var options = Object.extend({
+ greedy: true,
+ hoverclass: null
+ }, arguments[1] || {});
+
+ // cache containers
+ if(options.containment) {
+ options._containers = [];
+ var containment = options.containment;
+ if((typeof containment == 'object') &&
+ (containment.constructor == Array)) {
+ containment.each( function(c) { options._containers.push($(c)) });
+ } else {
+ options._containers.push($(containment));
+ }
+ }
+
+ Element.makePositioned(element); // fix IE
+ options.element = element;
+
+ this.drops.push(options);
+ },
+
+ isContained: function(element, drop) {
+ var parentNode = element.parentNode;
+ return drop._containers.detect(function(c) { return parentNode == c });
+ },
+
+ isAffected: function(pX, pY, element, drop) {
+ return (
+ (drop.element!=element) &&
+ ((!drop._containers) ||
+ this.isContained(element, drop)) &&
+ ((!drop.accept) ||
+ (Element.Class.has_any(element, drop.accept))) &&
+ Position.within(drop.element, pX, pY) );
+ },
+
+ deactivate: function(drop) {
+ if(drop.hoverclass)
+ Element.Class.remove(drop.element, drop.hoverclass);
+ this.last_active = null;
+ },
+
+ activate: function(drop) {
+ if(this.last_active) this.deactivate(this.last_active);
+ if(drop.hoverclass)
+ Element.Class.add(drop.element, drop.hoverclass);
+ this.last_active = drop;
+ },
+
+ show: function(event, element) {
+ if(!this.drops.length) return;
+ var pX = Event.pointerX(event);
+ var pY = Event.pointerY(event);
+ Position.prepare();
+
+ var i = this.drops.length-1; do {
+ var drop = this.drops[i];
+ if(this.isAffected(pX, pY, element, drop)) {
+ if(drop.onHover)
+ drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
+ if(drop.greedy) {
+ this.activate(drop);
+ return;
+ }
+ }
+ } while (i--);
+
+ if(this.last_active) this.deactivate(this.last_active);
+ },
+
+ 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 = {
+ observers: [],
+ addObserver: function(observer) {
+ this.observers.push(observer);
+ },
+ removeObserver: function(element) { // element instead of obsever fixes mem leaks
+ this.observers = this.observers.reject( function(o) { return o.element==element });
+ },
+ notify: function(eventName, draggable) { // 'onStart', 'onEnd'
+ this.observers.invoke(eventName, draggable);
+ }
+}
+
+/*--------------------------------------------------------------------------*/
+
+var Draggable = Class.create();
+Draggable.prototype = {
+ initialize: function(element) {
+ this.element = $(element);
+ var options = Object.extend({
+ handle: false,
+ starteffect: function(element) {
+ new Effect.Opacity(element, {duration:0.2, from:1.0, to:0.7});
+ },
+ 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.MoveBy(element, -top_offset, -left_offset, {duration:dur});
+ },
+ endeffect: function(element) {
+ new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0});
+ },
+ zindex: 1000,
+ revert: false
+ }, arguments[1] || {});
+
+ if(options.handle && (typeof options.handle == 'string'))
+ this.handle = Element.Class.childrenWith(this.element, options.handle)[0];
+
+ if(!this.handle) this.handle = $(options.handle);
+ if(!this.handle) this.handle = this.element;
+
+ Element.makePositioned(this.element); // fix IE
+
+ this.offsetX = 0;
+ this.offsetY = 0;
+ this.originalLeft = this.currentLeft();
+ this.originalTop = this.currentTop();
+ this.originalX = this.element.offsetLeft;
+ this.originalY = this.element.offsetTop;
+
+ this.options = options;
+
+ this.active = false;
+ this.dragging = false;
+
+ this.eventMouseDown = this.startDrag.bindAsEventListener(this);
+ this.eventMouseUp = this.endDrag.bindAsEventListener(this);
+ this.eventMouseMove = this.update.bindAsEventListener(this);
+ this.eventKeypress = this.keyPress.bindAsEventListener(this);
+
+ this.registerEvents();
+ },
+ destroy: function() {
+ Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
+ this.unregisterEvents();
+ },
+ registerEvents: function() {
+ Event.observe(document, "mouseup", this.eventMouseUp);
+ Event.observe(document, "mousemove", this.eventMouseMove);
+ Event.observe(document, "keypress", this.eventKeypress);
+ Event.observe(this.handle, "mousedown", this.eventMouseDown);
+ },
+ unregisterEvents: function() {
+ //if(!this.active) return;
+ //Event.stopObserving(document, "mouseup", this.eventMouseUp);
+ //Event.stopObserving(document, "mousemove", this.eventMouseMove);
+ //Event.stopObserving(document, "keypress", this.eventKeypress);
+ },
+ currentLeft: function() {
+ return parseInt(this.element.style.left || '0');
+ },
+ currentTop: function() {
+ return parseInt(this.element.style.top || '0')
+ },
+ startDrag: function(event) {
+ 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=='BUTTON' ||
+ src.tagName=='TEXTAREA')) return;
+
+ // this.registerEvents();
+ this.active = true;
+ var pointer = [Event.pointerX(event), Event.pointerY(event)];
+ var offsets = Position.cumulativeOffset(this.element);
+ this.offsetX = (pointer[0] - offsets[0]);
+ this.offsetY = (pointer[1] - offsets[1]);
+ Event.stop(event);
+ }
+ },
+ finishDrag: function(event, success) {
+ // this.unregisterEvents();
+
+ this.active = false;
+ 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);
+
+ var revert = this.options.revert;
+ if(revert && typeof revert == 'function') revert = revert(this.element);
+
+ if(revert && this.options.reverteffect) {
+ this.options.reverteffect(this.element,
+ this.currentTop()-this.originalTop,
+ this.currentLeft()-this.originalLeft);
+ } else {
+ this.originalLeft = this.currentLeft();
+ this.originalTop = this.currentTop();
+ }
+
+ if(this.options.zindex)
+ this.element.style.zIndex = this.originalZ;
+
+ if(this.options.endeffect)
+ this.options.endeffect(this.element);
+
+
+ Droppables.reset();
+ },
+ keyPress: function(event) {
+ if(this.active) {
+ if(event.keyCode==Event.KEY_ESC) {
+ this.finishDrag(event, false);
+ Event.stop(event);
+ }
+ }
+ },
+ endDrag: function(event) {
+ if(this.active && this.dragging) {
+ this.finishDrag(event, true);
+ Event.stop(event);
+ }
+ this.active = false;
+ this.dragging = false;
+ },
+ draw: function(event) {
+ var pointer = [Event.pointerX(event), Event.pointerY(event)];
+ var offsets = Position.cumulativeOffset(this.element);
+ offsets[0] -= this.currentLeft();
+ offsets[1] -= this.currentTop();
+ var style = this.element.style;
+ if((!this.options.constraint) || (this.options.constraint=='horizontal'))
+ style.left = (pointer[0] - offsets[0] - this.offsetX) + "px";
+ if((!this.options.constraint) || (this.options.constraint=='vertical'))
+ style.top = (pointer[1] - offsets[1] - this.offsetY) + "px";
+ if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
+ },
+ update: function(event) {
+ if(this.active) {
+ if(!this.dragging) {
+ var style = this.element.style;
+ this.dragging = true;
+
+ if(Element.getStyle(this.element,'position')=='')
+ style.position = "relative";
+
+ if(this.options.zindex) {
+ this.options.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
+ 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);
+ }
+
+ Draggables.notify('onStart', this);
+ if(this.options.starteffect) this.options.starteffect(this.element);
+ }
+
+ Droppables.show(event, this.element);
+ this.draw(event);
+ if(this.options.change) this.options.change(this);
+
+ // fix AppleWebKit rendering
+ if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
+
+ Event.stop(event);
+ }
+ }
+}
+
+/*--------------------------------------------------------------------------*/
+
+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 = {
+ sortables: new Array(),
+ options: function(element){
+ element = $(element);
+ return this.sortables.detect(function(s) { return s.element == element });
+ },
+ destroy: function(element){
+ element = $(element);
+ this.sortables.findAll(function(s) { return s.element == element }).each(function(s){
+ Draggables.removeObserver(s.element);
+ s.droppables.each(function(d){ Droppables.remove(d) });
+ s.draggables.invoke('destroy');
+ });
+ this.sortables = this.sortables.reject(function(s) { return s.element == element });
+ },
+ create: function(element) {
+ element = $(element);
+ var options = Object.extend({
+ element: element,
+ tag: 'li', // assumes li children, override with tag: 'tagname'
+ dropOnEmpty: false,
+ tree: false, // fixme: unimplemented
+ 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,
+ hoverclass: null,
+ ghosting: false,
+ format: null,
+ onChange: function() {},
+ onUpdate: function() {}
+ }, arguments[1] || {});
+
+ // clear any old sortable with same element
+ this.destroy(element);
+
+ // build options for the draggables
+ var options_for_draggable = {
+ revert: true,
+ 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,
+ hoverclass: options.hoverclass,
+ onHover: Sortable.onHover,
+ greedy: !options.dropOnEmpty
+ }
+
+ // fix for gecko engine
+ Element.cleanWhitespace(element);
+
+ options.draggables = [];
+ options.droppables = [];
+
+ // make it so
+
+ // drop on empty handling
+ if(options.dropOnEmpty) {
+ Droppables.add(element,
+ {containment: options.containment, onHover: Sortable.onEmptyHover, greedy: false});
+ options.droppables.push(element);
+ }
+
+ (this.findElements(element, options) || []).each( function(e) {
+ // handles are per-draggable
+ var handle = options.handle ?
+ Element.Class.childrenWith(e, options.handle)[0] : e;
+ options.draggables.push(
+ new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
+ Droppables.add(e, options_for_droppable);
+ options.droppables.push(e);
+ });
+
+ // keep reference
+ this.sortables.push(options);
+
+ // for onupdate
+ Draggables.addObserver(new SortableObserver(element, options.onUpdate));
+
+ },
+
+ // return all suitable-for-sortable elements in a guaranteed order
+ findElements: function(element, options) {
+ if(!element.hasChildNodes()) return null;
+ var elements = [];
+ $A(element.childNodes).each( function(e) {
+ if(e.tagName && e.tagName==options.tag.toUpperCase() &&
+ (!options.only || (Element.Class.has(e, options.only))))
+ elements.push(e);
+ if(options.tree) {
+ var grandchildren = this.findElements(e, options);
+ if(grandchildren) elements.push(grandchildren);
+ }
+ });
+
+ return (elements.length>0 ? elements.flatten() : null);
+ },
+
+ onHover: function(element, dropon, overlap) {
+ 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) {
+ if(element.parentNode!=dropon) {
+ dropon.appendChild(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.Class.add(Sortable._marker, 'dropmarker');
+ Sortable._marker.style.position = 'absolute';
+ document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
+ }
+ var offsets = Position.cumulativeOffset(dropon);
+ Sortable._marker.style.top = offsets[1] + 'px';
+ if(position=='after') Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
+ Sortable._marker.style.left = offsets[0] + 'px';
+ Element.show(Sortable._marker);
+ },
+
+ serialize: function(element) {
+ element = $(element);
+ var sortableOptions = this.options(element);
+ var options = Object.extend({
+ tag: sortableOptions.tag,
+ only: sortableOptions.only,
+ name: element.id,
+ format: sortableOptions.format || /^[^_]*_(.*)$/
+ }, arguments[1] || {});
+ return $(this.findElements(element, options) || []).collect( function(item) {
+ return (encodeURIComponent(options.name) + "[]=" +
+ encodeURIComponent(item.id.match(options.format) ? item.id.match(options.format)[1] : ''));
+ }).join("&");
+ }
+} \ No newline at end of file