michael@0: // script.aculo.us dragdrop.js v1.7.1_beta2, Tue May 15 15:15:45 EDT 2007
michael@0: 
michael@0: // Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
michael@0: //           (c) 2005-2007 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
michael@0: // 
michael@0: // script.aculo.us is freely distributable under the terms of an MIT-style license.
michael@0: // For details, see the script.aculo.us web site: http://script.aculo.us/
michael@0: 
michael@0: if(typeof Effect == 'undefined')
michael@0:   throw("dragdrop.js requires including script.aculo.us' effects.js library");
michael@0: 
michael@0: var Droppables = {
michael@0:   drops: [],
michael@0: 
michael@0:   remove: function(element) {
michael@0:     this.drops = this.drops.reject(function(d) { return d.element==$(element) });
michael@0:   },
michael@0: 
michael@0:   add: function(element) {
michael@0:     element = $(element);
michael@0:     var options = Object.extend({
michael@0:       greedy:     true,
michael@0:       hoverclass: null,
michael@0:       tree:       false
michael@0:     }, arguments[1] || {});
michael@0: 
michael@0:     // cache containers
michael@0:     if(options.containment) {
michael@0:       options._containers = [];
michael@0:       var containment = options.containment;
michael@0:       if((typeof containment == 'object') && 
michael@0:         (containment.constructor == Array)) {
michael@0:         containment.each( function(c) { options._containers.push($(c)) });
michael@0:       } else {
michael@0:         options._containers.push($(containment));
michael@0:       }
michael@0:     }
michael@0:     
michael@0:     if(options.accept) options.accept = [options.accept].flatten();
michael@0: 
michael@0:     Element.makePositioned(element); // fix IE
michael@0:     options.element = element;
michael@0: 
michael@0:     this.drops.push(options);
michael@0:   },
michael@0:   
michael@0:   findDeepestChild: function(drops) {
michael@0:     deepest = drops[0];
michael@0:       
michael@0:     for (i = 1; i < drops.length; ++i)
michael@0:       if (Element.isParent(drops[i].element, deepest.element))
michael@0:         deepest = drops[i];
michael@0:     
michael@0:     return deepest;
michael@0:   },
michael@0: 
michael@0:   isContained: function(element, drop) {
michael@0:     var containmentNode;
michael@0:     if(drop.tree) {
michael@0:       containmentNode = element.treeNode; 
michael@0:     } else {
michael@0:       containmentNode = element.parentNode;
michael@0:     }
michael@0:     return drop._containers.detect(function(c) { return containmentNode == c });
michael@0:   },
michael@0:   
michael@0:   isAffected: function(point, element, drop) {
michael@0:     return (
michael@0:       (drop.element!=element) &&
michael@0:       ((!drop._containers) ||
michael@0:         this.isContained(element, drop)) &&
michael@0:       ((!drop.accept) ||
michael@0:         (Element.classNames(element).detect( 
michael@0:           function(v) { return drop.accept.include(v) } ) )) &&
michael@0:       Position.within(drop.element, point[0], point[1]) );
michael@0:   },
michael@0: 
michael@0:   deactivate: function(drop) {
michael@0:     if(drop.hoverclass)
michael@0:       Element.removeClassName(drop.element, drop.hoverclass);
michael@0:     this.last_active = null;
michael@0:   },
michael@0: 
michael@0:   activate: function(drop) {
michael@0:     if(drop.hoverclass)
michael@0:       Element.addClassName(drop.element, drop.hoverclass);
michael@0:     this.last_active = drop;
michael@0:   },
michael@0: 
michael@0:   show: function(point, element) {
michael@0:     if(!this.drops.length) return;
michael@0:     var affected = [];
michael@0:     
michael@0:     if(this.last_active) this.deactivate(this.last_active);
michael@0:     this.drops.each( function(drop) {
michael@0:       if(Droppables.isAffected(point, element, drop))
michael@0:         affected.push(drop);
michael@0:     });
michael@0:         
michael@0:     if(affected.length>0) {
michael@0:       drop = Droppables.findDeepestChild(affected);
michael@0:       Position.within(drop.element, point[0], point[1]);
michael@0:       if(drop.onHover)
michael@0:         drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
michael@0:       
michael@0:       Droppables.activate(drop);
michael@0:     }
michael@0:   },
michael@0: 
michael@0:   fire: function(event, element) {
michael@0:     if(!this.last_active) return;
michael@0:     Position.prepare();
michael@0: 
michael@0:     if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
michael@0:       if (this.last_active.onDrop) {
michael@0:         this.last_active.onDrop(element, this.last_active.element, event); 
michael@0:         return true; 
michael@0:       }
michael@0:   },
michael@0: 
michael@0:   reset: function() {
michael@0:     if(this.last_active)
michael@0:       this.deactivate(this.last_active);
michael@0:   }
michael@0: }
michael@0: 
michael@0: var Draggables = {
michael@0:   drags: [],
michael@0:   observers: [],
michael@0:   
michael@0:   register: function(draggable) {
michael@0:     if(this.drags.length == 0) {
michael@0:       this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
michael@0:       this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
michael@0:       this.eventKeypress  = this.keyPress.bindAsEventListener(this);
michael@0:       
michael@0:       Event.observe(document, "mouseup", this.eventMouseUp);
michael@0:       Event.observe(document, "mousemove", this.eventMouseMove);
michael@0:       Event.observe(document, "keypress", this.eventKeypress);
michael@0:     }
michael@0:     this.drags.push(draggable);
michael@0:   },
michael@0:   
michael@0:   unregister: function(draggable) {
michael@0:     this.drags = this.drags.reject(function(d) { return d==draggable });
michael@0:     if(this.drags.length == 0) {
michael@0:       Event.stopObserving(document, "mouseup", this.eventMouseUp);
michael@0:       Event.stopObserving(document, "mousemove", this.eventMouseMove);
michael@0:       Event.stopObserving(document, "keypress", this.eventKeypress);
michael@0:     }
michael@0:   },
michael@0:   
michael@0:   activate: function(draggable) {
michael@0:     if(draggable.options.delay) { 
michael@0:       this._timeout = setTimeout(function() { 
michael@0:         Draggables._timeout = null; 
michael@0:         window.focus(); 
michael@0:         Draggables.activeDraggable = draggable; 
michael@0:       }.bind(this), draggable.options.delay); 
michael@0:     } else {
michael@0:       window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
michael@0:       this.activeDraggable = draggable;
michael@0:     }
michael@0:   },
michael@0:   
michael@0:   deactivate: function() {
michael@0:     this.activeDraggable = null;
michael@0:   },
michael@0:   
michael@0:   updateDrag: function(event) {
michael@0:     if(!this.activeDraggable) return;
michael@0:     var pointer = [Event.pointerX(event), Event.pointerY(event)];
michael@0:     // Mozilla-based browsers fire successive mousemove events with
michael@0:     // the same coordinates, prevent needless redrawing (moz bug?)
michael@0:     if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
michael@0:     this._lastPointer = pointer;
michael@0:     
michael@0:     this.activeDraggable.updateDrag(event, pointer);
michael@0:   },
michael@0:   
michael@0:   endDrag: function(event) {
michael@0:     if(this._timeout) { 
michael@0:       clearTimeout(this._timeout); 
michael@0:       this._timeout = null; 
michael@0:     }
michael@0:     if(!this.activeDraggable) return;
michael@0:     this._lastPointer = null;
michael@0:     this.activeDraggable.endDrag(event);
michael@0:     this.activeDraggable = null;
michael@0:   },
michael@0:   
michael@0:   keyPress: function(event) {
michael@0:     if(this.activeDraggable)
michael@0:       this.activeDraggable.keyPress(event);
michael@0:   },
michael@0:   
michael@0:   addObserver: function(observer) {
michael@0:     this.observers.push(observer);
michael@0:     this._cacheObserverCallbacks();
michael@0:   },
michael@0:   
michael@0:   removeObserver: function(element) {  // element instead of observer fixes mem leaks
michael@0:     this.observers = this.observers.reject( function(o) { return o.element==element });
michael@0:     this._cacheObserverCallbacks();
michael@0:   },
michael@0:   
michael@0:   notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
michael@0:     if(this[eventName+'Count'] > 0)
michael@0:       this.observers.each( function(o) {
michael@0:         if(o[eventName]) o[eventName](eventName, draggable, event);
michael@0:       });
michael@0:     if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
michael@0:   },
michael@0:   
michael@0:   _cacheObserverCallbacks: function() {
michael@0:     ['onStart','onEnd','onDrag'].each( function(eventName) {
michael@0:       Draggables[eventName+'Count'] = Draggables.observers.select(
michael@0:         function(o) { return o[eventName]; }
michael@0:       ).length;
michael@0:     });
michael@0:   }
michael@0: }
michael@0: 
michael@0: /*--------------------------------------------------------------------------*/
michael@0: 
michael@0: var Draggable = Class.create();
michael@0: Draggable._dragging    = {};
michael@0: 
michael@0: Draggable.prototype = {
michael@0:   initialize: function(element) {
michael@0:     var defaults = {
michael@0:       handle: false,
michael@0:       reverteffect: function(element, top_offset, left_offset) {
michael@0:         var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
michael@0:         new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
michael@0:           queue: {scope:'_draggable', position:'end'}
michael@0:         });
michael@0:       },
michael@0:       endeffect: function(element) {
michael@0:         var toOpacity = typeof element._opacity == 'number' ? element._opacity : 1.0;
michael@0:         new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity, 
michael@0:           queue: {scope:'_draggable', position:'end'},
michael@0:           afterFinish: function(){ 
michael@0:             Draggable._dragging[element] = false 
michael@0:           }
michael@0:         }); 
michael@0:       },
michael@0:       zindex: 1000,
michael@0:       revert: false,
michael@0:       quiet: false,
michael@0:       scroll: false,
michael@0:       scrollSensitivity: 20,
michael@0:       scrollSpeed: 15,
michael@0:       snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }
michael@0:       delay: 0
michael@0:     };
michael@0:     
michael@0:     if(!arguments[1] || typeof arguments[1].endeffect == 'undefined')
michael@0:       Object.extend(defaults, {
michael@0:         starteffect: function(element) {
michael@0:           element._opacity = Element.getOpacity(element);
michael@0:           Draggable._dragging[element] = true;
michael@0:           new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7}); 
michael@0:         }
michael@0:       });
michael@0:     
michael@0:     var options = Object.extend(defaults, arguments[1] || {});
michael@0: 
michael@0:     this.element = $(element);
michael@0:     
michael@0:     if(options.handle && (typeof options.handle == 'string'))
michael@0:       this.handle = this.element.down('.'+options.handle, 0);
michael@0:     
michael@0:     if(!this.handle) this.handle = $(options.handle);
michael@0:     if(!this.handle) this.handle = this.element;
michael@0:     
michael@0:     if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
michael@0:       options.scroll = $(options.scroll);
michael@0:       this._isScrollChild = Element.childOf(this.element, options.scroll);
michael@0:     }
michael@0: 
michael@0:     Element.makePositioned(this.element); // fix IE    
michael@0: 
michael@0:     this.delta    = this.currentDelta();
michael@0:     this.options  = options;
michael@0:     this.dragging = false;   
michael@0: 
michael@0:     this.eventMouseDown = this.initDrag.bindAsEventListener(this);
michael@0:     Event.observe(this.handle, "mousedown", this.eventMouseDown);
michael@0:     
michael@0:     Draggables.register(this);
michael@0:   },
michael@0:   
michael@0:   destroy: function() {
michael@0:     Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
michael@0:     Draggables.unregister(this);
michael@0:   },
michael@0:   
michael@0:   currentDelta: function() {
michael@0:     return([
michael@0:       parseInt(Element.getStyle(this.element,'left') || '0'),
michael@0:       parseInt(Element.getStyle(this.element,'top') || '0')]);
michael@0:   },
michael@0:   
michael@0:   initDrag: function(event) {
michael@0:     if(typeof Draggable._dragging[this.element] != 'undefined' &&
michael@0:       Draggable._dragging[this.element]) return;
michael@0:     if(Event.isLeftClick(event)) {    
michael@0:       // abort on form elements, fixes a Firefox issue
michael@0:       var src = Event.element(event);
michael@0:       if((tag_name = src.tagName.toUpperCase()) && (
michael@0:         tag_name=='INPUT' ||
michael@0:         tag_name=='SELECT' ||
michael@0:         tag_name=='OPTION' ||
michael@0:         tag_name=='BUTTON' ||
michael@0:         tag_name=='TEXTAREA')) return;
michael@0:         
michael@0:       var pointer = [Event.pointerX(event), Event.pointerY(event)];
michael@0:       var pos     = Position.cumulativeOffset(this.element);
michael@0:       this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
michael@0:       
michael@0:       Draggables.activate(this);
michael@0:       Event.stop(event);
michael@0:     }
michael@0:   },
michael@0:   
michael@0:   startDrag: function(event) {
michael@0:     this.dragging = true;
michael@0:     
michael@0:     if(this.options.zindex) {
michael@0:       this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
michael@0:       this.element.style.zIndex = this.options.zindex;
michael@0:     }
michael@0:     
michael@0:     if(this.options.ghosting) {
michael@0:       this._clone = this.element.cloneNode(true);
michael@0:       Position.absolutize(this.element);
michael@0:       this.element.parentNode.insertBefore(this._clone, this.element);
michael@0:     }
michael@0:     
michael@0:     if(this.options.scroll) {
michael@0:       if (this.options.scroll == window) {
michael@0:         var where = this._getWindowScroll(this.options.scroll);
michael@0:         this.originalScrollLeft = where.left;
michael@0:         this.originalScrollTop = where.top;
michael@0:       } else {
michael@0:         this.originalScrollLeft = this.options.scroll.scrollLeft;
michael@0:         this.originalScrollTop = this.options.scroll.scrollTop;
michael@0:       }
michael@0:     }
michael@0:     
michael@0:     Draggables.notify('onStart', this, event);
michael@0:         
michael@0:     if(this.options.starteffect) this.options.starteffect(this.element);
michael@0:   },
michael@0:   
michael@0:   updateDrag: function(event, pointer) {
michael@0:     if(!this.dragging) this.startDrag(event);
michael@0:     
michael@0:     if(!this.options.quiet){
michael@0:       Position.prepare();
michael@0:       Droppables.show(pointer, this.element);
michael@0:     }
michael@0:     
michael@0:     Draggables.notify('onDrag', this, event);
michael@0:     
michael@0:     this.draw(pointer);
michael@0:     if(this.options.change) this.options.change(this);
michael@0:     
michael@0:     if(this.options.scroll) {
michael@0:       this.stopScrolling();
michael@0:       
michael@0:       var p;
michael@0:       if (this.options.scroll == window) {
michael@0:         with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
michael@0:       } else {
michael@0:         p = Position.page(this.options.scroll);
michael@0:         p[0] += this.options.scroll.scrollLeft + Position.deltaX;
michael@0:         p[1] += this.options.scroll.scrollTop + Position.deltaY;
michael@0:         p.push(p[0]+this.options.scroll.offsetWidth);
michael@0:         p.push(p[1]+this.options.scroll.offsetHeight);
michael@0:       }
michael@0:       var speed = [0,0];
michael@0:       if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
michael@0:       if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
michael@0:       if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
michael@0:       if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
michael@0:       this.startScrolling(speed);
michael@0:     }
michael@0:     
michael@0:     // fix AppleWebKit rendering
michael@0:     if(Prototype.Browser.WebKit) window.scrollBy(0,0);
michael@0:     
michael@0:     Event.stop(event);
michael@0:   },
michael@0:   
michael@0:   finishDrag: function(event, success) {
michael@0:     this.dragging = false;
michael@0:     
michael@0:     if(this.options.quiet){
michael@0:       Position.prepare();
michael@0:       var pointer = [Event.pointerX(event), Event.pointerY(event)];
michael@0:       Droppables.show(pointer, this.element);
michael@0:     }
michael@0: 
michael@0:     if(this.options.ghosting) {
michael@0:       Position.relativize(this.element);
michael@0:       Element.remove(this._clone);
michael@0:       this._clone = null;
michael@0:     }
michael@0: 
michael@0:     var dropped = false; 
michael@0:     if(success) { 
michael@0:       dropped = Droppables.fire(event, this.element); 
michael@0:       if (!dropped) dropped = false; 
michael@0:     }
michael@0:     if(dropped && this.options.onDropped) this.options.onDropped(this.element);
michael@0:     Draggables.notify('onEnd', this, event);
michael@0: 
michael@0:     var revert = this.options.revert;
michael@0:     if(revert && typeof revert == 'function') revert = revert(this.element);
michael@0:     
michael@0:     var d = this.currentDelta();
michael@0:     if(revert && this.options.reverteffect) {
michael@0:       if (dropped == 0 || revert != 'failure')
michael@0:         this.options.reverteffect(this.element,
michael@0:           d[1]-this.delta[1], d[0]-this.delta[0]);
michael@0:     } else {
michael@0:       this.delta = d;
michael@0:     }
michael@0: 
michael@0:     if(this.options.zindex)
michael@0:       this.element.style.zIndex = this.originalZ;
michael@0: 
michael@0:     if(this.options.endeffect) 
michael@0:       this.options.endeffect(this.element);
michael@0:       
michael@0:     Draggables.deactivate(this);
michael@0:     Droppables.reset();
michael@0:   },
michael@0:   
michael@0:   keyPress: function(event) {
michael@0:     if(event.keyCode!=Event.KEY_ESC) return;
michael@0:     this.finishDrag(event, false);
michael@0:     Event.stop(event);
michael@0:   },
michael@0:   
michael@0:   endDrag: function(event) {
michael@0:     if(!this.dragging) return;
michael@0:     this.stopScrolling();
michael@0:     this.finishDrag(event, true);
michael@0:     Event.stop(event);
michael@0:   },
michael@0:   
michael@0:   draw: function(point) {
michael@0:     var pos = Position.cumulativeOffset(this.element);
michael@0:     if(this.options.ghosting) {
michael@0:       var r   = Position.realOffset(this.element);
michael@0:       pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
michael@0:     }
michael@0:     
michael@0:     var d = this.currentDelta();
michael@0:     pos[0] -= d[0]; pos[1] -= d[1];
michael@0:     
michael@0:     if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
michael@0:       pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
michael@0:       pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
michael@0:     }
michael@0:     
michael@0:     var p = [0,1].map(function(i){ 
michael@0:       return (point[i]-pos[i]-this.offset[i]) 
michael@0:     }.bind(this));
michael@0:     
michael@0:     if(this.options.snap) {
michael@0:       if(typeof this.options.snap == 'function') {
michael@0:         p = this.options.snap(p[0],p[1],this);
michael@0:       } else {
michael@0:       if(this.options.snap instanceof Array) {
michael@0:         p = p.map( function(v, i) {
michael@0:           return Math.round(v/this.options.snap[i])*this.options.snap[i] }.bind(this))
michael@0:       } else {
michael@0:         p = p.map( function(v) {
michael@0:           return Math.round(v/this.options.snap)*this.options.snap }.bind(this))
michael@0:       }
michael@0:     }}
michael@0:     
michael@0:     var style = this.element.style;
michael@0:     if((!this.options.constraint) || (this.options.constraint=='horizontal'))
michael@0:       style.left = p[0] + "px";
michael@0:     if((!this.options.constraint) || (this.options.constraint=='vertical'))
michael@0:       style.top  = p[1] + "px";
michael@0:     
michael@0:     if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
michael@0:   },
michael@0:   
michael@0:   stopScrolling: function() {
michael@0:     if(this.scrollInterval) {
michael@0:       clearInterval(this.scrollInterval);
michael@0:       this.scrollInterval = null;
michael@0:       Draggables._lastScrollPointer = null;
michael@0:     }
michael@0:   },
michael@0:   
michael@0:   startScrolling: function(speed) {
michael@0:     if(!(speed[0] || speed[1])) return;
michael@0:     this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
michael@0:     this.lastScrolled = new Date();
michael@0:     this.scrollInterval = setInterval(this.scroll.bind(this), 10);
michael@0:   },
michael@0:   
michael@0:   scroll: function() {
michael@0:     var current = new Date();
michael@0:     var delta = current - this.lastScrolled;
michael@0:     this.lastScrolled = current;
michael@0:     if(this.options.scroll == window) {
michael@0:       with (this._getWindowScroll(this.options.scroll)) {
michael@0:         if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
michael@0:           var d = delta / 1000;
michael@0:           this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
michael@0:         }
michael@0:       }
michael@0:     } else {
michael@0:       this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
michael@0:       this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
michael@0:     }
michael@0:     
michael@0:     Position.prepare();
michael@0:     Droppables.show(Draggables._lastPointer, this.element);
michael@0:     Draggables.notify('onDrag', this);
michael@0:     if (this._isScrollChild) {
michael@0:       Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
michael@0:       Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
michael@0:       Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
michael@0:       if (Draggables._lastScrollPointer[0] < 0)
michael@0:         Draggables._lastScrollPointer[0] = 0;
michael@0:       if (Draggables._lastScrollPointer[1] < 0)
michael@0:         Draggables._lastScrollPointer[1] = 0;
michael@0:       this.draw(Draggables._lastScrollPointer);
michael@0:     }
michael@0:     
michael@0:     if(this.options.change) this.options.change(this);
michael@0:   },
michael@0:   
michael@0:   _getWindowScroll: function(w) {
michael@0:     var T, L, W, H;
michael@0:     with (w.document) {
michael@0:       if (w.document.documentElement && documentElement.scrollTop) {
michael@0:         T = documentElement.scrollTop;
michael@0:         L = documentElement.scrollLeft;
michael@0:       } else if (w.document.body) {
michael@0:         T = body.scrollTop;
michael@0:         L = body.scrollLeft;
michael@0:       }
michael@0:       if (w.innerWidth) {
michael@0:         W = w.innerWidth;
michael@0:         H = w.innerHeight;
michael@0:       } else if (w.document.documentElement && documentElement.clientWidth) {
michael@0:         W = documentElement.clientWidth;
michael@0:         H = documentElement.clientHeight;
michael@0:       } else {
michael@0:         W = body.offsetWidth;
michael@0:         H = body.offsetHeight
michael@0:       }
michael@0:     }
michael@0:     return { top: T, left: L, width: W, height: H };
michael@0:   }
michael@0: }
michael@0: 
michael@0: /*--------------------------------------------------------------------------*/
michael@0: 
michael@0: var SortableObserver = Class.create();
michael@0: SortableObserver.prototype = {
michael@0:   initialize: function(element, observer) {
michael@0:     this.element   = $(element);
michael@0:     this.observer  = observer;
michael@0:     this.lastValue = Sortable.serialize(this.element);
michael@0:   },
michael@0:   
michael@0:   onStart: function() {
michael@0:     this.lastValue = Sortable.serialize(this.element);
michael@0:   },
michael@0:   
michael@0:   onEnd: function() {
michael@0:     Sortable.unmark();
michael@0:     if(this.lastValue != Sortable.serialize(this.element))
michael@0:       this.observer(this.element)
michael@0:   }
michael@0: }
michael@0: 
michael@0: var Sortable = {
michael@0:   SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
michael@0:   
michael@0:   sortables: {},
michael@0:   
michael@0:   _findRootElement: function(element) {
michael@0:     while (element.tagName.toUpperCase() != "BODY") {  
michael@0:       if(element.id && Sortable.sortables[element.id]) return element;
michael@0:       element = element.parentNode;
michael@0:     }
michael@0:   },
michael@0: 
michael@0:   options: function(element) {
michael@0:     element = Sortable._findRootElement($(element));
michael@0:     if(!element) return;
michael@0:     return Sortable.sortables[element.id];
michael@0:   },
michael@0:   
michael@0:   destroy: function(element){
michael@0:     var s = Sortable.options(element);
michael@0:     
michael@0:     if(s) {
michael@0:       Draggables.removeObserver(s.element);
michael@0:       s.droppables.each(function(d){ Droppables.remove(d) });
michael@0:       s.draggables.invoke('destroy');
michael@0:       
michael@0:       delete Sortable.sortables[s.element.id];
michael@0:     }
michael@0:   },
michael@0: 
michael@0:   create: function(element) {
michael@0:     element = $(element);
michael@0:     var options = Object.extend({ 
michael@0:       element:     element,
michael@0:       tag:         'li',       // assumes li children, override with tag: 'tagname'
michael@0:       dropOnEmpty: false,
michael@0:       tree:        false,
michael@0:       treeTag:     'ul',
michael@0:       overlap:     'vertical', // one of 'vertical', 'horizontal'
michael@0:       constraint:  'vertical', // one of 'vertical', 'horizontal', false
michael@0:       containment: element,    // also takes array of elements (or id's); or false
michael@0:       handle:      false,      // or a CSS class
michael@0:       only:        false,
michael@0:       delay:       0,
michael@0:       hoverclass:  null,
michael@0:       ghosting:    false,
michael@0:       quiet:       false, 
michael@0:       scroll:      false,
michael@0:       scrollSensitivity: 20,
michael@0:       scrollSpeed: 15,
michael@0:       format:      this.SERIALIZE_RULE,
michael@0:       
michael@0:       // these take arrays of elements or ids and can be 
michael@0:       // used for better initialization performance
michael@0:       elements:    false,
michael@0:       handles:     false,
michael@0:       
michael@0:       onChange:    Prototype.emptyFunction,
michael@0:       onUpdate:    Prototype.emptyFunction
michael@0:     }, arguments[1] || {});
michael@0: 
michael@0:     // clear any old sortable with same element
michael@0:     this.destroy(element);
michael@0: 
michael@0:     // build options for the draggables
michael@0:     var options_for_draggable = {
michael@0:       revert:      true,
michael@0:       quiet:       options.quiet,
michael@0:       scroll:      options.scroll,
michael@0:       scrollSpeed: options.scrollSpeed,
michael@0:       scrollSensitivity: options.scrollSensitivity,
michael@0:       delay:       options.delay,
michael@0:       ghosting:    options.ghosting,
michael@0:       constraint:  options.constraint,
michael@0:       handle:      options.handle };
michael@0: 
michael@0:     if(options.starteffect)
michael@0:       options_for_draggable.starteffect = options.starteffect;
michael@0: 
michael@0:     if(options.reverteffect)
michael@0:       options_for_draggable.reverteffect = options.reverteffect;
michael@0:     else
michael@0:       if(options.ghosting) options_for_draggable.reverteffect = function(element) {
michael@0:         element.style.top  = 0;
michael@0:         element.style.left = 0;
michael@0:       };
michael@0: 
michael@0:     if(options.endeffect)
michael@0:       options_for_draggable.endeffect = options.endeffect;
michael@0: 
michael@0:     if(options.zindex)
michael@0:       options_for_draggable.zindex = options.zindex;
michael@0: 
michael@0:     // build options for the droppables  
michael@0:     var options_for_droppable = {
michael@0:       overlap:     options.overlap,
michael@0:       containment: options.containment,
michael@0:       tree:        options.tree,
michael@0:       hoverclass:  options.hoverclass,
michael@0:       onHover:     Sortable.onHover
michael@0:     }
michael@0:     
michael@0:     var options_for_tree = {
michael@0:       onHover:      Sortable.onEmptyHover,
michael@0:       overlap:      options.overlap,
michael@0:       containment:  options.containment,
michael@0:       hoverclass:   options.hoverclass
michael@0:     }
michael@0: 
michael@0:     // fix for gecko engine
michael@0:     Element.cleanWhitespace(element); 
michael@0: 
michael@0:     options.draggables = [];
michael@0:     options.droppables = [];
michael@0: 
michael@0:     // drop on empty handling
michael@0:     if(options.dropOnEmpty || options.tree) {
michael@0:       Droppables.add(element, options_for_tree);
michael@0:       options.droppables.push(element);
michael@0:     }
michael@0: 
michael@0:     (options.elements || this.findElements(element, options) || []).each( function(e,i) {
michael@0:       var handle = options.handles ? $(options.handles[i]) :
michael@0:         (options.handle ? $(e).getElementsByClassName(options.handle)[0] : e); 
michael@0:       options.draggables.push(
michael@0:         new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
michael@0:       Droppables.add(e, options_for_droppable);
michael@0:       if(options.tree) e.treeNode = element;
michael@0:       options.droppables.push(e);      
michael@0:     });
michael@0:     
michael@0:     if(options.tree) {
michael@0:       (Sortable.findTreeElements(element, options) || []).each( function(e) {
michael@0:         Droppables.add(e, options_for_tree);
michael@0:         e.treeNode = element;
michael@0:         options.droppables.push(e);
michael@0:       });
michael@0:     }
michael@0: 
michael@0:     // keep reference
michael@0:     this.sortables[element.id] = options;
michael@0: 
michael@0:     // for onupdate
michael@0:     Draggables.addObserver(new SortableObserver(element, options.onUpdate));
michael@0: 
michael@0:   },
michael@0: 
michael@0:   // return all suitable-for-sortable elements in a guaranteed order
michael@0:   findElements: function(element, options) {
michael@0:     return Element.findChildren(
michael@0:       element, options.only, options.tree ? true : false, options.tag);
michael@0:   },
michael@0:   
michael@0:   findTreeElements: function(element, options) {
michael@0:     return Element.findChildren(
michael@0:       element, options.only, options.tree ? true : false, options.treeTag);
michael@0:   },
michael@0: 
michael@0:   onHover: function(element, dropon, overlap) {
michael@0:     if(Element.isParent(dropon, element)) return;
michael@0: 
michael@0:     if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
michael@0:       return;
michael@0:     } else if(overlap>0.5) {
michael@0:       Sortable.mark(dropon, 'before');
michael@0:       if(dropon.previousSibling != element) {
michael@0:         var oldParentNode = element.parentNode;
michael@0:         element.style.visibility = "hidden"; // fix gecko rendering
michael@0:         dropon.parentNode.insertBefore(element, dropon);
michael@0:         if(dropon.parentNode!=oldParentNode) 
michael@0:           Sortable.options(oldParentNode).onChange(element);
michael@0:         Sortable.options(dropon.parentNode).onChange(element);
michael@0:       }
michael@0:     } else {
michael@0:       Sortable.mark(dropon, 'after');
michael@0:       var nextElement = dropon.nextSibling || null;
michael@0:       if(nextElement != element) {
michael@0:         var oldParentNode = element.parentNode;
michael@0:         element.style.visibility = "hidden"; // fix gecko rendering
michael@0:         dropon.parentNode.insertBefore(element, nextElement);
michael@0:         if(dropon.parentNode!=oldParentNode) 
michael@0:           Sortable.options(oldParentNode).onChange(element);
michael@0:         Sortable.options(dropon.parentNode).onChange(element);
michael@0:       }
michael@0:     }
michael@0:   },
michael@0:   
michael@0:   onEmptyHover: function(element, dropon, overlap) {
michael@0:     var oldParentNode = element.parentNode;
michael@0:     var droponOptions = Sortable.options(dropon);
michael@0:         
michael@0:     if(!Element.isParent(dropon, element)) {
michael@0:       var index;
michael@0:       
michael@0:       var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
michael@0:       var child = null;
michael@0:             
michael@0:       if(children) {
michael@0:         var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
michael@0:         
michael@0:         for (index = 0; index < children.length; index += 1) {
michael@0:           if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
michael@0:             offset -= Element.offsetSize (children[index], droponOptions.overlap);
michael@0:           } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
michael@0:             child = index + 1 < children.length ? children[index + 1] : null;
michael@0:             break;
michael@0:           } else {
michael@0:             child = children[index];
michael@0:             break;
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:       
michael@0:       dropon.insertBefore(element, child);
michael@0:       
michael@0:       Sortable.options(oldParentNode).onChange(element);
michael@0:       droponOptions.onChange(element);
michael@0:     }
michael@0:   },
michael@0: 
michael@0:   unmark: function() {
michael@0:     if(Sortable._marker) Sortable._marker.hide();
michael@0:   },
michael@0: 
michael@0:   mark: function(dropon, position) {
michael@0:     // mark on ghosting only
michael@0:     var sortable = Sortable.options(dropon.parentNode);
michael@0:     if(sortable && !sortable.ghosting) return; 
michael@0: 
michael@0:     if(!Sortable._marker) {
michael@0:       Sortable._marker = 
michael@0:         ($('dropmarker') || Element.extend(document.createElement('DIV'))).
michael@0:           hide().addClassName('dropmarker').setStyle({position:'absolute'});
michael@0:       document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
michael@0:     }    
michael@0:     var offsets = Position.cumulativeOffset(dropon);
michael@0:     Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
michael@0:     
michael@0:     if(position=='after')
michael@0:       if(sortable.overlap == 'horizontal') 
michael@0:         Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
michael@0:       else
michael@0:         Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
michael@0:     
michael@0:     Sortable._marker.show();
michael@0:   },
michael@0:   
michael@0:   _tree: function(element, options, parent) {
michael@0:     var children = Sortable.findElements(element, options) || [];
michael@0:   
michael@0:     for (var i = 0; i < children.length; ++i) {
michael@0:       var match = children[i].id.match(options.format);
michael@0: 
michael@0:       if (!match) continue;
michael@0:       
michael@0:       var child = {
michael@0:         id: encodeURIComponent(match ? match[1] : null),
michael@0:         element: element,
michael@0:         parent: parent,
michael@0:         children: [],
michael@0:         position: parent.children.length,
michael@0:         container: $(children[i]).down(options.treeTag)
michael@0:       }
michael@0:       
michael@0:       /* Get the element containing the children and recurse over it */
michael@0:       if (child.container)
michael@0:         this._tree(child.container, options, child)
michael@0:       
michael@0:       parent.children.push (child);
michael@0:     }
michael@0: 
michael@0:     return parent; 
michael@0:   },
michael@0: 
michael@0:   tree: function(element) {
michael@0:     element = $(element);
michael@0:     var sortableOptions = this.options(element);
michael@0:     var options = Object.extend({
michael@0:       tag: sortableOptions.tag,
michael@0:       treeTag: sortableOptions.treeTag,
michael@0:       only: sortableOptions.only,
michael@0:       name: element.id,
michael@0:       format: sortableOptions.format
michael@0:     }, arguments[1] || {});
michael@0:     
michael@0:     var root = {
michael@0:       id: null,
michael@0:       parent: null,
michael@0:       children: [],
michael@0:       container: element,
michael@0:       position: 0
michael@0:     }
michael@0:     
michael@0:     return Sortable._tree(element, options, root);
michael@0:   },
michael@0: 
michael@0:   /* Construct a [i] index for a particular node */
michael@0:   _constructIndex: function(node) {
michael@0:     var index = '';
michael@0:     do {
michael@0:       if (node.id) index = '[' + node.position + ']' + index;
michael@0:     } while ((node = node.parent) != null);
michael@0:     return index;
michael@0:   },
michael@0: 
michael@0:   sequence: function(element) {
michael@0:     element = $(element);
michael@0:     var options = Object.extend(this.options(element), arguments[1] || {});
michael@0:     
michael@0:     return $(this.findElements(element, options) || []).map( function(item) {
michael@0:       return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
michael@0:     });
michael@0:   },
michael@0: 
michael@0:   setSequence: function(element, new_sequence) {
michael@0:     element = $(element);
michael@0:     var options = Object.extend(this.options(element), arguments[2] || {});
michael@0:     
michael@0:     var nodeMap = {};
michael@0:     this.findElements(element, options).each( function(n) {
michael@0:         if (n.id.match(options.format))
michael@0:             nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
michael@0:         n.parentNode.removeChild(n);
michael@0:     });
michael@0:    
michael@0:     new_sequence.each(function(ident) {
michael@0:       var n = nodeMap[ident];
michael@0:       if (n) {
michael@0:         n[1].appendChild(n[0]);
michael@0:         delete nodeMap[ident];
michael@0:       }
michael@0:     });
michael@0:   },
michael@0:   
michael@0:   serialize: function(element) {
michael@0:     element = $(element);
michael@0:     var options = Object.extend(Sortable.options(element), arguments[1] || {});
michael@0:     var name = encodeURIComponent(
michael@0:       (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
michael@0:     
michael@0:     if (options.tree) {
michael@0:       return Sortable.tree(element, arguments[1]).children.map( function (item) {
michael@0:         return [name + Sortable._constructIndex(item) + "[id]=" + 
michael@0:                 encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
michael@0:       }).flatten().join('&');
michael@0:     } else {
michael@0:       return Sortable.sequence(element, arguments[1]).map( function(item) {
michael@0:         return name + "[]=" + encodeURIComponent(item);
michael@0:       }).join('&');
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: // Returns true if child is contained within element
michael@0: Element.isParent = function(child, element) {
michael@0:   if (!child.parentNode || child == element) return false;
michael@0:   if (child.parentNode == element) return true;
michael@0:   return Element.isParent(child.parentNode, element);
michael@0: }
michael@0: 
michael@0: Element.findChildren = function(element, only, recursive, tagName) {   
michael@0:   if(!element.hasChildNodes()) return null;
michael@0:   tagName = tagName.toUpperCase();
michael@0:   if(only) only = [only].flatten();
michael@0:   var elements = [];
michael@0:   $A(element.childNodes).each( function(e) {
michael@0:     if(e.tagName && e.tagName.toUpperCase()==tagName &&
michael@0:       (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
michael@0:         elements.push(e);
michael@0:     if(recursive) {
michael@0:       var grandchildren = Element.findChildren(e, only, recursive, tagName);
michael@0:       if(grandchildren) elements.push(grandchildren);
michael@0:     }
michael@0:   });
michael@0: 
michael@0:   return (elements.length>0 ? elements.flatten() : []);
michael@0: }
michael@0: 
michael@0: Element.offsetSize = function (element, type) {
michael@0:   return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
michael@0: }