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// script.aculo.us dragdrop.js v1.8.0, Tue Nov 06 15:01:40 +0300 2007

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// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)

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//           (c) 2005-2007 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)

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// 

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// script.aculo.us is freely distributable under the terms of an MIT-style license.

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// For details, see the script.aculo.us web site: http://script.aculo.us/

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if(Object.isUndefined(Effect))

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  throw("dragdrop.js requires including script.aculo.us' effects.js library");

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var Droppables = {

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  drops: [],

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  remove: function(element) {

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    this.drops = this.drops.reject(function(d) { return d.element==$(element) });

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  },

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  add: function(element) {

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    element = $(element);

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    var options = Object.extend({

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      greedy:     true,

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      hoverclass: null,

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      tree:       false

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    }, arguments[1] || { });

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    // cache containers

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    if(options.containment) {

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      options._containers = [];

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      var containment = options.containment;

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      if(Object.isArray(containment)) {

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        containment.each( function(c) { options._containers.push($(c)) });

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      } else {

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        options._containers.push($(containment));

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      }

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    }

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    if(options.accept) options.accept = [options.accept].flatten();

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    Element.makePositioned(element); // fix IE

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    options.element = element;

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    this.drops.push(options);

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  },

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  findDeepestChild: function(drops) {

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    deepest = drops[0];

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    for (i = 1; i < drops.length; ++i)

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      if (Element.isParent(drops[i].element, deepest.element))

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        deepest = drops[i];

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    return deepest;

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  },

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  isContained: function(element, drop) {

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    var containmentNode;

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    if(drop.tree) {

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      containmentNode = element.treeNode; 

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    } else {

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      containmentNode = element.parentNode;

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    }

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    return drop._containers.detect(function(c) { return containmentNode == c });

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  },

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  isAffected: function(point, element, drop) {

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    return (

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      (drop.element!=element) &&

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      ((!drop._containers) ||

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        this.isContained(element, drop)) &&

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      ((!drop.accept) ||

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        (Element.classNames(element).detect( 

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          function(v) { return drop.accept.include(v) } ) )) &&

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      Position.within(drop.element, point[0], point[1]) );

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  },

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  deactivate: function(drop) {

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    if(drop.hoverclass)

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      Element.removeClassName(drop.element, drop.hoverclass);

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    this.last_active = null;

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  },

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  activate: function(drop) {

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    if(drop.hoverclass)

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      Element.addClassName(drop.element, drop.hoverclass);

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    this.last_active = drop;

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  },

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  show: function(point, element) {

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    if(!this.drops.length) return;

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    var drop, affected = [];

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    this.drops.each( function(drop) {

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      if(Droppables.isAffected(point, element, drop))

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        affected.push(drop);

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    });

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    if(affected.length>0)

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      drop = Droppables.findDeepestChild(affected);

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    if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);

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    if (drop) {

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      Position.within(drop.element, point[0], point[1]);

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      if(drop.onHover)

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        drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));

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      if (drop != this.last_active) Droppables.activate(drop);

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    }

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  },

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  fire: function(event, element) {

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    if(!this.last_active) return;

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    Position.prepare();

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    if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))

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      if (this.last_active.onDrop) {

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        this.last_active.onDrop(element, this.last_active.element, event); 

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        return true; 

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      }

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  },

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  reset: function() {

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    if(this.last_active)

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      this.deactivate(this.last_active);

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  }

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}

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var Draggables = {

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  drags: [],

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  observers: [],

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  register: function(draggable) {

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    if(this.drags.length == 0) {

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      this.eventMouseUp   = this.endDrag.bindAsEventListener(this);

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      this.eventMouseMove = this.updateDrag.bindAsEventListener(this);

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      this.eventKeypress  = this.keyPress.bindAsEventListener(this);

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      Event.observe(document, "mouseup", this.eventMouseUp);

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      Event.observe(document, "mousemove", this.eventMouseMove);

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      Event.observe(document, "keypress", this.eventKeypress);

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    }

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    this.drags.push(draggable);

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  },

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  unregister: function(draggable) {

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    this.drags = this.drags.reject(function(d) { return d==draggable });

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    if(this.drags.length == 0) {

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      Event.stopObserving(document, "mouseup", this.eventMouseUp);

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      Event.stopObserving(document, "mousemove", this.eventMouseMove);

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      Event.stopObserving(document, "keypress", this.eventKeypress);

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    }

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  },

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  activate: function(draggable) {

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    if(draggable.options.delay) { 

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      this._timeout = setTimeout(function() { 

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        Draggables._timeout = null; 

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        window.focus(); 

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        Draggables.activeDraggable = draggable; 

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      }.bind(this), draggable.options.delay); 

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    } else {

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      window.focus(); // allows keypress events if window isn't currently focused, fails for Safari

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      this.activeDraggable = draggable;

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    }

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  },

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  deactivate: function() {

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    this.activeDraggable = null;

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  },

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  updateDrag: function(event) {

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    if(!this.activeDraggable) return;

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    var pointer = [Event.pointerX(event), Event.pointerY(event)];

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    // Mozilla-based browsers fire successive mousemove events with

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    // the same coordinates, prevent needless redrawing (moz bug?)

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    if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;

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    this._lastPointer = pointer;

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    this.activeDraggable.updateDrag(event, pointer);

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  },

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  endDrag: function(event) {

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    if(this._timeout) { 

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      clearTimeout(this._timeout); 

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      this._timeout = null; 

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    }

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    if(!this.activeDraggable) return;

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    this._lastPointer = null;

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    this.activeDraggable.endDrag(event);

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    this.activeDraggable = null;

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  },

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  keyPress: function(event) {

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    if(this.activeDraggable)

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      this.activeDraggable.keyPress(event);

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  },

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  addObserver: function(observer) {

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    this.observers.push(observer);

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    this._cacheObserverCallbacks();

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  },

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  removeObserver: function(element) {  // element instead of observer fixes mem leaks

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    this.observers = this.observers.reject( function(o) { return o.element==element });

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    this._cacheObserverCallbacks();

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  },

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  notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'

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    if(this[eventName+'Count'] > 0)

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      this.observers.each( function(o) {

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        if(o[eventName]) o[eventName](eventName, draggable, event);

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      });

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    if(draggable.options[eventName]) draggable.options[eventName](draggable, event);

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  },

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  _cacheObserverCallbacks: function() {

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    ['onStart','onEnd','onDrag'].each( function(eventName) {

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      Draggables[eventName+'Count'] = Draggables.observers.select(

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        function(o) { return o[eventName]; }

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      ).length;

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    });

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  }

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}

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/*--------------------------------------------------------------------------*/

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var Draggable = Class.create({

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  initialize: function(element) {

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    var defaults = {

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      handle: false,

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      reverteffect: function(element, top_offset, left_offset) {

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        var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;

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        new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,

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          queue: {scope:'_draggable', position:'end'}

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        });

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      },

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      endeffect: function(element) {

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        var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;

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        new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity, 

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          queue: {scope:'_draggable', position:'end'},

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          afterFinish: function(){ 

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            Draggable._dragging[element] = false 

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          }

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        }); 

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      },

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      zindex: 1000,

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      revert: false,

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      quiet: false,

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      scroll: false,

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      scrollSensitivity: 20,

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      scrollSpeed: 15,

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      snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }

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      delay: 0

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    };

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    if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))

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      Object.extend(defaults, {

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        starteffect: function(element) {

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          element._opacity = Element.getOpacity(element);

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          Draggable._dragging[element] = true;

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          new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7}); 

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        }

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      });

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    var options = Object.extend(defaults, arguments[1] || { });

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    this.element = $(element);

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    if(options.handle && Object.isString(options.handle))

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      this.handle = this.element.down('.'+options.handle, 0);

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    if(!this.handle) this.handle = $(options.handle);

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    if(!this.handle) this.handle = this.element;

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    if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {

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      options.scroll = $(options.scroll);

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      this._isScrollChild = Element.childOf(this.element, options.scroll);

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    }

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    Element.makePositioned(this.element); // fix IE    

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    this.options  = options;

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    this.dragging = false;   

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    this.eventMouseDown = this.initDrag.bindAsEventListener(this);

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    Event.observe(this.handle, "mousedown", this.eventMouseDown);

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    Draggables.register(this);

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  },

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  destroy: function() {

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    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);

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    Draggables.unregister(this);

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  },

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  currentDelta: function() {

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    return([

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      parseInt(Element.getStyle(this.element,'left') || '0'),

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      parseInt(Element.getStyle(this.element,'top') || '0')]);

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  },

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  initDrag: function(event) {

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    if(!Object.isUndefined(Draggable._dragging[this.element]) &&

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      Draggable._dragging[this.element]) return;

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    if(Event.isLeftClick(event)) {    

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      // abort on form elements, fixes a Firefox issue

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      var src = Event.element(event);

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      if((tag_name = src.tagName.toUpperCase()) && (

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        tag_name=='INPUT' ||

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        tag_name=='SELECT' ||

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        tag_name=='OPTION' ||

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        tag_name=='BUTTON' ||

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        tag_name=='TEXTAREA')) return;

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      var pointer = [Event.pointerX(event), Event.pointerY(event)];

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      var pos     = Position.cumulativeOffset(this.element);

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      this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });

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      Draggables.activate(this);

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      Event.stop(event);

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    }

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  },

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  startDrag: function(event) {

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    this.dragging = true;

   326

    if(!this.delta)

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      this.delta = this.currentDelta();

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    if(this.options.zindex) {

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      this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);

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      this.element.style.zIndex = this.options.zindex;

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    }

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    if(this.options.ghosting) {

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      this._clone = this.element.cloneNode(true);

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      this.element._originallyAbsolute = (this.element.getStyle('position') == 'absolute');

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      if (!this.element._originallyAbsolute)

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        Position.absolutize(this.element);

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      this.element.parentNode.insertBefore(this._clone, this.element);

   340

    }

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   342

    if(this.options.scroll) {

   343

      if (this.options.scroll == window) {

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        var where = this._getWindowScroll(this.options.scroll);

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        this.originalScrollLeft = where.left;

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        this.originalScrollTop = where.top;

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      } else {

   348

        this.originalScrollLeft = this.options.scroll.scrollLeft;

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        this.originalScrollTop = this.options.scroll.scrollTop;

   350

      }

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    }

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    Draggables.notify('onStart', this, event);

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    if(this.options.starteffect) this.options.starteffect(this.element);

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  },

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  updateDrag: function(event, pointer) {

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    if(!this.dragging) this.startDrag(event);

   360

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    if(!this.options.quiet){

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      Position.prepare();

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      Droppables.show(pointer, this.element);

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    }

   365

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    Draggables.notify('onDrag', this, event);

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    this.draw(pointer);

   369

    if(this.options.change) this.options.change(this);

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    if(this.options.scroll) {

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      this.stopScrolling();

   373

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      var p;

   375

      if (this.options.scroll == window) {

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        with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }

   377

      } else {

   378

        p = Position.page(this.options.scroll);

   379

        p[0] += this.options.scroll.scrollLeft + Position.deltaX;

   380

        p[1] += this.options.scroll.scrollTop + Position.deltaY;

   381

        p.push(p[0]+this.options.scroll.offsetWidth);

   382

        p.push(p[1]+this.options.scroll.offsetHeight);

   383

      }

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      var speed = [0,0];

   385

      if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);

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      if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);

   387

      if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);

   388

      if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);

   389

      this.startScrolling(speed);

   390

    }

   391

   392

    // fix AppleWebKit rendering

   393

    if(Prototype.Browser.WebKit) window.scrollBy(0,0);

   394

   395

    Event.stop(event);

   396

  },

   397

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  finishDrag: function(event, success) {

   399

    this.dragging = false;

   400

   401

    if(this.options.quiet){

   402

      Position.prepare();

   403

      var pointer = [Event.pointerX(event), Event.pointerY(event)];

   404

      Droppables.show(pointer, this.element);

   405

    }

   406

   407

    if(this.options.ghosting) {

   408

      if (!this.element._originallyAbsolute)

   409

        Position.relativize(this.element);

   410

      delete this.element._originallyAbsolute;

   411

      Element.remove(this._clone);

   412

      this._clone = null;

   413

    }

   414

   415

    var dropped = false; 

   416

    if(success) { 

   417

      dropped = Droppables.fire(event, this.element); 

   418

      if (!dropped) dropped = false; 

   419

    }

   420

    if(dropped && this.options.onDropped) this.options.onDropped(this.element);

   421

    Draggables.notify('onEnd', this, event);

   422

   423

    var revert = this.options.revert;

   424

    if(revert && Object.isFunction(revert)) revert = revert(this.element);

   425

   426

    var d = this.currentDelta();

   427

    if(revert && this.options.reverteffect) {

   428

      if (dropped == 0 || revert != 'failure')

   429

        this.options.reverteffect(this.element,

   430

          d[1]-this.delta[1], d[0]-this.delta[0]);

   431

    } else {

   432

      this.delta = d;

   433

    }

   434

   435

    if(this.options.zindex)

   436

      this.element.style.zIndex = this.originalZ;

   437

   438

    if(this.options.endeffect) 

   439

      this.options.endeffect(this.element);

   440

   441

    Draggables.deactivate(this);

   442

    Droppables.reset();

   443

  },

   444

   445

  keyPress: function(event) {

   446

    if(event.keyCode!=Event.KEY_ESC) return;

   447

    this.finishDrag(event, false);

   448

    Event.stop(event);

   449

  },

   450

   451

  endDrag: function(event) {

   452

    if(!this.dragging) return;

   453

    this.stopScrolling();

   454

    this.finishDrag(event, true);

   455

    Event.stop(event);

   456

  },

   457

   458

  draw: function(point) {

   459

    var pos = Position.cumulativeOffset(this.element);

   460

    if(this.options.ghosting) {

   461

      var r   = Position.realOffset(this.element);

   462

      pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;

   463

    }

   464

   465

    var d = this.currentDelta();

   466

    pos[0] -= d[0]; pos[1] -= d[1];

   467

   468

    if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {

   469

      pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;

   470

      pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;

   471

    }

   472

   473

    var p = [0,1].map(function(i){ 

   474

      return (point[i]-pos[i]-this.offset[i]) 

   475

    }.bind(this));

   476

   477

    if(this.options.snap) {

   478

      if(Object.isFunction(this.options.snap)) {

   479

        p = this.options.snap(p[0],p[1],this);

   480

      } else {

   481

      if(Object.isArray(this.options.snap)) {

   482

        p = p.map( function(v, i) {

   483

          return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this))

   484

      } else {

   485

        p = p.map( function(v) {

   486

          return (v/this.options.snap).round()*this.options.snap }.bind(this))

   487

      }

   488

    }}

   489

   490

    var style = this.element.style;

   491

    if((!this.options.constraint) || (this.options.constraint=='horizontal'))

   492

      style.left = p[0] + "px";

   493

    if((!this.options.constraint) || (this.options.constraint=='vertical'))

   494

      style.top  = p[1] + "px";

   495

   496

    if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering

   497

  },

   498

   499

  stopScrolling: function() {

   500

    if(this.scrollInterval) {

   501

      clearInterval(this.scrollInterval);

   502

      this.scrollInterval = null;

   503

      Draggables._lastScrollPointer = null;

   504

    }

   505

  },

   506

   507

  startScrolling: function(speed) {

   508

    if(!(speed[0] || speed[1])) return;

   509

    this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];

   510

    this.lastScrolled = new Date();

   511

    this.scrollInterval = setInterval(this.scroll.bind(this), 10);

   512

  },

   513

   514

  scroll: function() {

   515

    var current = new Date();

   516

    var delta = current - this.lastScrolled;

   517

    this.lastScrolled = current;

   518

    if(this.options.scroll == window) {

   519

      with (this._getWindowScroll(this.options.scroll)) {

   520

        if (this.scrollSpeed[0] || this.scrollSpeed[1]) {

   521

          var d = delta / 1000;

   522

          this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );

   523

        }

   524

      }

   525

    } else {

   526

      this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;

   527

      this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;

   528

    }

   529

   530