root/js/dragdrop.js

// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// 
// Element.Class part Copyright (c) 2005 by Rick Olson
// 
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Element.Class = {
    // Element.toggleClass(element, className) toggles the class being on/off
    // Element.toggleClass(element, className1, className2) toggles between both classes,
    //   defaulting to className1 if neither exist
    toggle: function(element, className) {
      if(Element.Class.has(element, className)) {
        Element.Class.remove(element, className);
        if(arguments.length == 3) Element.Class.add(element, arguments[2]);
      } else {
        Element.Class.add(element, className);
        if(arguments.length == 3) Element.Class.remove(element, arguments[2]);
      }
    },

    // gets space-delimited classnames of an element as an array
    get: function(element) {
      element = $(element);
      return element.className.split(' ');
    },

    // functions adapted from original functions by Gavin Kistner
    remove: function(element) {
      element = $(element);
      var regEx;
      for(var i = 1; i < arguments.length; i++) {
        regEx = new RegExp("^" + arguments[i] + "\\b\\s*|\\s*\\b" + arguments[i] + "\\b", 'g');
        element.className = element.className.replace(regEx, '')
      }
    },

    add: function(element) {
      element = $(element);
      for(var i = 1; i < arguments.length; i++) {
        Element.Class.remove(element, arguments[i]);
        element.className += (element.className.length > 0 ? ' ' : '') + arguments[i];
      }
    },

    // returns true if all given classes exist in said element
    has: function(element) {
      element = $(element);
      if(!element || !element.className) return false;
      var regEx;
      for(var i = 1; i < arguments.length; i++) {
        regEx = new RegExp("\\b" + arguments[i] + "\\b");
        if(!regEx.test(element.className)) return false;
      }
      return true;
    },
    
    // expects arrays of strings and/or strings as optional paramters
    // Element.Class.has_any(element, ['classA','classB','classC'], 'classD')
    has_any: function(element) {
      element = $(element);
      if(!element || !element.className) return false;
      var regEx;
      for(var i = 1; i < arguments.length; i++) {
        if((typeof arguments[i] == 'object') && 
          (arguments[i].constructor == Array)) {
          for(var j = 0; j < arguments[i].length; j++) {
            regEx = new RegExp("\\b" + arguments[i][j] + "\\b");
            if(regEx.test(element.className)) return true;
          }
        } else {
          regEx = new RegExp("\\b" + arguments[i] + "\\b");
          if(regEx.test(element.className)) return true;
        }
      }
      return false;
    },
    
    childrenWith: function(element, className) {
      var children = $(element).getElementsByTagName('*');
      var elements = new Array();
      
      for (var i = 0; i < children.length; i++) {
        if (Element.Class.has(children[i], className)) {
          elements.push(children[i]);
          break;
        }
      }
      
      return elements;
    }
}

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

var Droppables = {
  drops: false,
  
  remove: function(element) {
    for(var i = 0; i < this.drops.length; i++)
      if(this.drops[i].element == element)
        this.drops.splice(i,1);
  },
  
  add: function(element) {
    var element = $(element);
    var options = Object.extend({
      greedy:     true,
      hoverclass: null  
    }, arguments[1] || {});
    
    // cache containers
    if(options.containment) {
      options._containers = new Array();
      var containment = options.containment;
      if((typeof containment == 'object') && 
        (containment.constructor == Array)) {
        for(var i=0; i<containment.length; i++)
          options._containers.push($(containment[i]));
      } else {
        options._containers.push($(containment));
      }
      options._containers_length = 
        options._containers.length-1;
    }
    
    Element.makePositioned(element); // fix IE
    
    options.element = element;
    
    // activate the droppable    
    if(!this.drops) this.drops = [];
    this.drops.push(options);
  },
  
  is_contained: function(element, drop) {
    var containers = drop._containers;
    var parentNode = element.parentNode;
    var i = drop._containers_length;
    do { if(parentNode==containers[i]) return true; } while (i--);
    return false;
  },
  
  is_affected: function(pX, pY, element, drop) {
    return (
      (drop.element!=element) &&
      ((!drop._containers) ||
        this.is_contained(element, drop)) &&
      ((!drop.accept) ||
        (Element.Class.has_any(element, drop.accept))) &&
      Position.within(drop.element, pX, pY) );
  },
  
  deactivate: function(drop) {
    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) 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.is_affected(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--);
  },
  
  fire: function(event, element) {
    if(!this.last_active) return;
    Position.prepare();
    
    if (this.is_affected(Event.pointerX(event), Event.pointerY(event), element, this.last_active))
      if (this.last_active.onDrop) 
        this.last_active.onDrop(element, this.last_active);
    
  },
  
  reset: function() {
    if(this.last_active)
      this.deactivate(this.last_active);
  }
}

Draggables = {
  observers: new Array(),
  addObserver: function(observer) {
    this.observers.push(observer);    
  },
  removeObserver: function(element) {  // element instead of obsever fixes mem leaks
    for(var i = 0; i < this.observers.length; i++)
      if(this.observers[i].element && (this.observers[i].element == element))
        this.observers.splice(i,1);
  },
  notify: function(eventName, draggable) {  // 'onStart', 'onEnd'
    for(var i = 0; i < this.observers.length; i++)
      this.observers[i][eventName](draggable);
  }
}

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

Draggable = Class.create();
Draggable.prototype = {
  initialize: function(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) {
        new Effect.MoveBy(element, -top_offset, -left_offset, {duration:0.4});
      },
      endeffect: function(element) { 
         new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0}); 
      },
      zindex: 1000,
      revert: false
    }, arguments[1] || {});
    
    this.element      = $(element);
    this.handle       = options.handle ? $(options.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.originalZ    = parseInt(this.element.style.zIndex || "0");
    
    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);
    
    Event.observe(this.handle, "mousedown", this.eventMouseDown);
    Event.observe(document, "mouseup", this.eventMouseUp);
    Event.observe(document, "mousemove", this.eventMouseMove);
    Event.observe(document, "keypress", this.eventKeypress);
  },
  destroy: function() {
    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
    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)) {
      this.active = true;
      
      var style = this.element.style;
      this.originalY = this.element.offsetTop  - this.currentTop()  - this.originalTop;
      this.originalX = this.element.offsetLeft - this.currentLeft() - this.originalLeft;
      this.offsetY =  event.clientY - this.originalY - this.originalTop;
      this.offsetX =  event.clientX - this.originalX - this.originalLeft;
      
      Event.stop(event);
    }
  },
  finishDrag: function(event, success) {
    this.active = false;
    this.dragging = false;
    
    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();
    }
    
    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 style = this.element.style;
    this.originalX = this.element.offsetLeft - this.currentLeft() - this.originalLeft;
    this.originalY = this.element.offsetTop  - this.currentTop()  - this.originalTop;
    if((!this.options.constraint) || (this.options.constraint=='horizontal'))
      style.left = ((event.clientX - this.originalX) - this.offsetX) + "px";
    if((!this.options.constraint) || (this.options.constraint=='vertical'))
      style.top  = ((event.clientY - this.originalY) - 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(style.position=="") style.position = "relative";
        style.zIndex = this.options.zindex;
        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);
   }
  }
}

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

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() {    
    if(this.lastValue != Sortable.serialize(this.element))
      this.observer(this.element)
  }
}

Sortable = {
  sortables: new Array(),
  options: function(element){
    var element = $(element);
    for(var i=0;i<this.sortables.length;i++)
      if(this.sortables[i].element == element)
        return this.sortables[i];
    return null;        
  },
  destroy: function(element){
    var element = $(element);
    for(var i=0;i<this.sortables.length;i++) {
      if(this.sortables[i].element == element) {
        var s = this.sortables[i];
        Draggables.removeObserver(s.element);
        for(var j=0;j<s.droppables.length;j++)
          Droppables.remove(s.droppables[j]);
        for(var j=0;j<s.draggables.length;j++)
          s.draggables[j].destroy();
        this.sortables.splice(i,1);
      }
    }
  },
  create: function(element) {
    var element = $(element);
    var options = Object.extend({ 
      element:     element,
      tag:         'li',       // assumes li children, override with tag: 'tagname'
      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,
      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,
      constraint:  options.constraint,
      handle:      handle };
    if(options.starteffect)
      options_for_draggable.starteffect = options.starteffect;
    if(options.reverteffect)
      options_for_draggable.reverteffect = options.reverteffect;
    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: function(element, dropon, overlap) { 
        if(overlap>0.5) {
          if(dropon.previousSibling != element) {
            var oldParentNode = element.parentNode;
            element.style.visibility = "hidden"; // fix gecko rendering
            dropon.parentNode.insertBefore(element, dropon);
            if(dropon.parentNode!=oldParentNode && oldParentNode.sortable) 
              oldParentNode.sortable.onChange(element);
            if(dropon.parentNode.sortable)
              dropon.parentNode.sortable.onChange(element);
          }
        } else {                
          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 && oldParentNode.sortable) 
              oldParentNode.sortable.onChange(element);
            if(dropon.parentNode.sortable)
              dropon.parentNode.sortable.onChange(element);
          }
        }
      }
    }

    // fix for gecko engine
    Element.cleanWhitespace(element); 
    
    options.draggables = [];
    options.droppables = [];
    
    // make it so 
    var elements = element.childNodes;
    for (var i = 0; i < elements.length; i++) 
      if(elements[i].tagName && elements[i].tagName==options.tag.toUpperCase() &&
        (!options.only || (Element.Class.has(elements[i], options.only)))) {
        
        // handles are per-draggable
        var handle = options.handle ? 
          Element.Class.childrenWith(elements[i], options.handle)[0] : elements[i];
        
        options.draggables.push(new Draggable(elements[i], Object.extend(options_for_draggable, { handle: handle })));
        
        Droppables.add(elements[i], options_for_droppable);
        options.droppables.push(elements[i]);
        
      }
      
    // keep reference
    this.sortables.push(options);
    
    // for onupdate
    Draggables.addObserver(new SortableObserver(element, options.onUpdate));

  },
  serialize: function(element) {
    var element = $(element);
    var sortableOptions = this.options(element);
    var options = Object.extend({
      tag:  sortableOptions.tag,
      only: sortableOptions.only,
      name: element.id
    }, arguments[1] || {});
    
    var items = $(element).childNodes;
    var queryComponents = new Array();
 
    for(var i=0; i<items.length; i++)
      if(items[i].tagName && items[i].tagName==options.tag.toUpperCase() &&
        (!options.only || (Element.Class.has(items[i], options.only))))
        queryComponents.push(
          encodeURIComponent(options.name) + "[]=" + 
          encodeURIComponent(items[i].id.split("_")[1]));

    return queryComponents.join("&");
  }
}
1	dpavlin	83	// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
2			//
3			// Element.Class part Copyright (c) 2005 by Rick Olson
4			//
5			// Permission is hereby granted, free of charge, to any person obtaining
6			// a copy of this software and associated documentation files (the
7			// "Software"), to deal in the Software without restriction, including
8			// without limitation the rights to use, copy, modify, merge, publish,
9			// distribute, sublicense, and/or sell copies of the Software, and to
10			// permit persons to whom the Software is furnished to do so, subject to
11			// the following conditions:
12			//
13			// The above copyright notice and this permission notice shall be
14			// included in all copies or substantial portions of the Software.
15			//
16			// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17			// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18			// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19			// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20			// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21			// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22			// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23
24			Element.Class = {
25			// Element.toggleClass(element, className) toggles the class being on/off
26			// Element.toggleClass(element, className1, className2) toggles between both classes,
27			// defaulting to className1 if neither exist
28			toggle: function(element, className) {
29			if(Element.Class.has(element, className)) {
30			Element.Class.remove(element, className);
31			if(arguments.length == 3) Element.Class.add(element, arguments[2]);
32			} else {
33			Element.Class.add(element, className);
34			if(arguments.length == 3) Element.Class.remove(element, arguments[2]);
35			}
36			},
37
38			// gets space-delimited classnames of an element as an array
39			get: function(element) {
40			element = $(element);
41			return element.className.split(' ');
42			},
43
44			// functions adapted from original functions by Gavin Kistner
45			remove: function(element) {
46			element = $(element);
47			var regEx;
48			for(var i = 1; i < arguments.length; i++) {
49			regEx = new RegExp("^" + arguments[i] + "\\b\\s\|\\s\\b" + arguments[i] + "\\b", 'g');
50			element.className = element.className.replace(regEx, '')
51			}
52			},
53
54			add: function(element) {
55			element = $(element);
56			for(var i = 1; i < arguments.length; i++) {
57			Element.Class.remove(element, arguments[i]);
58			element.className += (element.className.length > 0 ? ' ' : '') + arguments[i];
59			}
60			},
61
62			// returns true if all given classes exist in said element
63			has: function(element) {
64			element = $(element);
65			if(!element \|\| !element.className) return false;
66			var regEx;
67			for(var i = 1; i < arguments.length; i++) {
68			regEx = new RegExp("\\b" + arguments[i] + "\\b");
69			if(!regEx.test(element.className)) return false;
70			}
71			return true;
72			},
73
74			// expects arrays of strings and/or strings as optional paramters
75			// Element.Class.has_any(element, ['classA','classB','classC'], 'classD')
76			has_any: function(element) {
77			element = $(element);
78			if(!element \|\| !element.className) return false;
79			var regEx;
80			for(var i = 1; i < arguments.length; i++) {
81			if((typeof arguments[i] == 'object') &&
82			(arguments[i].constructor == Array)) {
83			for(var j = 0; j < arguments[i].length; j++) {
84			regEx = new RegExp("\\b" + arguments[i][j] + "\\b");
85			if(regEx.test(element.className)) return true;
86			}
87			} else {
88			regEx = new RegExp("\\b" + arguments[i] + "\\b");
89			if(regEx.test(element.className)) return true;
90			}
91			}
92			return false;
93			},
94
95			childrenWith: function(element, className) {
96			var children = $(element).getElementsByTagName('*');
97			var elements = new Array();
98
99			for (var i = 0; i < children.length; i++) {
100			if (Element.Class.has(children[i], className)) {
101			elements.push(children[i]);
102			break;
103			}
104			}
105
106			return elements;
107			}
108			}
109
110			/--------------------------------------------------------------------------/
111
112			var Droppables = {
113			drops: false,
114
115			remove: function(element) {
116			for(var i = 0; i < this.drops.length; i++)
117			if(this.drops[i].element == element)
118			this.drops.splice(i,1);
119			},
120
121			add: function(element) {
122			var element = $(element);
123			var options = Object.extend({
124			greedy: true,
125			hoverclass: null
126			}, arguments[1] \|\| {});
127
128			// cache containers
129			if(options.containment) {
130			options._containers = new Array();
131			var containment = options.containment;
132			if((typeof containment == 'object') &&
133			(containment.constructor == Array)) {
134			for(var i=0; i<containment.length; i++)
135			options._containers.push($(containment[i]));
136			} else {
137			options._containers.push($(containment));
138			}
139			options._containers_length =
140			options._containers.length-1;
141			}
142
143			Element.makePositioned(element); // fix IE
144
145			options.element = element;
146
147			// activate the droppable
148			if(!this.drops) this.drops = [];
149			this.drops.push(options);
150			},
151
152			is_contained: function(element, drop) {
153			var containers = drop._containers;
154			var parentNode = element.parentNode;
155			var i = drop._containers_length;
156			do { if(parentNode==containers[i]) return true; } while (i--);
157			return false;
158			},
159
160			is_affected: function(pX, pY, element, drop) {
161			return (
162			(drop.element!=element) &&
163			((!drop._containers) \|\|
164			this.is_contained(element, drop)) &&
165			((!drop.accept) \|\|
166			(Element.Class.has_any(element, drop.accept))) &&
167			Position.within(drop.element, pX, pY) );
168			},
169
170			deactivate: function(drop) {
171			Element.Class.remove(drop.element, drop.hoverclass);
172			this.last_active = null;
173			},
174
175			activate: function(drop) {
176			if(this.last_active) this.deactivate(this.last_active);
177			if(drop.hoverclass) {
178			Element.Class.add(drop.element, drop.hoverclass);
179			this.last_active = drop;
180			}
181			},
182
183			show: function(event, element) {
184			if(!this.drops) return;
185			var pX = Event.pointerX(event);
186			var pY = Event.pointerY(event);
187			Position.prepare();
188
189			var i = this.drops.length-1; do {
190			var drop = this.drops[i];
191			if(this.is_affected(pX, pY, element, drop)) {
192			if(drop.onHover)
193			drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
194			if(drop.greedy) {
195			this.activate(drop);
196			return;
197			}
198			}
199			} while (i--);
200			},
201
202			fire: function(event, element) {
203			if(!this.last_active) return;
204			Position.prepare();
205
206			if (this.is_affected(Event.pointerX(event), Event.pointerY(event), element, this.last_active))
207			if (this.last_active.onDrop)
208			this.last_active.onDrop(element, this.last_active);
209
210			},
211
212			reset: function() {
213			if(this.last_active)
214			this.deactivate(this.last_active);
215			}
216			}
217
218			Draggables = {
219			observers: new Array(),
220			addObserver: function(observer) {
221			this.observers.push(observer);
222			},
223			removeObserver: function(element) { // element instead of obsever fixes mem leaks
224			for(var i = 0; i < this.observers.length; i++)
225			if(this.observers[i].element && (this.observers[i].element == element))
226			this.observers.splice(i,1);
227			},
228			notify: function(eventName, draggable) { // 'onStart', 'onEnd'
229			for(var i = 0; i < this.observers.length; i++)
230			this.observers[i][eventName](draggable);
231			}
232			}
233
234			/--------------------------------------------------------------------------/
235
236			Draggable = Class.create();
237			Draggable.prototype = {
238			initialize: function(element) {
239			var options = Object.extend({
240			handle: false,
241			starteffect: function(element) {
242			new Effect.Opacity(element, {duration:0.2, from:1.0, to:0.7});
243			},
244			reverteffect: function(element, top_offset, left_offset) {
245			new Effect.MoveBy(element, -top_offset, -left_offset, {duration:0.4});
246			},
247			endeffect: function(element) {
248			new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0});
249			},
250			zindex: 1000,
251			revert: false
252			}, arguments[1] \|\| {});
253
254			this.element = $(element);
255			this.handle = options.handle ? $(options.handle) : this.element;
256
257			Element.makePositioned(this.element); // fix IE
258
259			this.offsetX = 0;
260			this.offsetY = 0;
261			this.originalLeft = this.currentLeft();
262			this.originalTop = this.currentTop();
263			this.originalX = this.element.offsetLeft;
264			this.originalY = this.element.offsetTop;
265			this.originalZ = parseInt(this.element.style.zIndex \|\| "0");
266
267			this.options = options;
268
269			this.active = false;
270			this.dragging = false;
271
272			this.eventMouseDown = this.startDrag.bindAsEventListener(this);
273			this.eventMouseUp = this.endDrag.bindAsEventListener(this);
274			this.eventMouseMove = this.update.bindAsEventListener(this);
275			this.eventKeypress = this.keyPress.bindAsEventListener(this);
276
277			Event.observe(this.handle, "mousedown", this.eventMouseDown);
278			Event.observe(document, "mouseup", this.eventMouseUp);
279			Event.observe(document, "mousemove", this.eventMouseMove);
280			Event.observe(document, "keypress", this.eventKeypress);
281			},
282			destroy: function() {
283			Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
284			Event.stopObserving(document, "mouseup", this.eventMouseUp);
285			Event.stopObserving(document, "mousemove", this.eventMouseMove);
286			Event.stopObserving(document, "keypress", this.eventKeypress);
287			},
288			currentLeft: function() {
289			return parseInt(this.element.style.left \|\| '0');
290			},
291			currentTop: function() {
292			return parseInt(this.element.style.top \|\| '0')
293			},
294			startDrag: function(event) {
295			if(Event.isLeftClick(event)) {
296			this.active = true;
297
298			var style = this.element.style;
299			this.originalY = this.element.offsetTop - this.currentTop() - this.originalTop;
300			this.originalX = this.element.offsetLeft - this.currentLeft() - this.originalLeft;
301			this.offsetY = event.clientY - this.originalY - this.originalTop;
302			this.offsetX = event.clientX - this.originalX - this.originalLeft;
303
304			Event.stop(event);
305			}
306			},
307			finishDrag: function(event, success) {
308			this.active = false;
309			this.dragging = false;
310
311			if(success) Droppables.fire(event, this.element);
312			Draggables.notify('onEnd', this);
313
314			var revert = this.options.revert;
315			if(revert && typeof revert == 'function') revert = revert(this.element);
316
317			if(revert && this.options.reverteffect) {
318			this.options.reverteffect(this.element,
319			this.currentTop()-this.originalTop,
320			this.currentLeft()-this.originalLeft);
321			} else {
322			this.originalLeft = this.currentLeft();
323			this.originalTop = this.currentTop();
324			}
325
326			this.element.style.zIndex = this.originalZ;
327
328			if(this.options.endeffect)
329			this.options.endeffect(this.element);
330
331			Droppables.reset();
332			},
333			keyPress: function(event) {
334			if(this.active) {
335			if(event.keyCode==Event.KEY_ESC) {
336			this.finishDrag(event, false);
337			Event.stop(event);
338			}
339			}
340			},
341			endDrag: function(event) {
342			if(this.active && this.dragging) {
343			this.finishDrag(event, true);
344			Event.stop(event);
345			}
346			this.active = false;
347			this.dragging = false;
348			},
349			draw: function(event) {
350			var style = this.element.style;
351			this.originalX = this.element.offsetLeft - this.currentLeft() - this.originalLeft;
352			this.originalY = this.element.offsetTop - this.currentTop() - this.originalTop;
353			if((!this.options.constraint) \|\| (this.options.constraint=='horizontal'))
354			style.left = ((event.clientX - this.originalX) - this.offsetX) + "px";
355			if((!this.options.constraint) \|\| (this.options.constraint=='vertical'))
356			style.top = ((event.clientY - this.originalY) - this.offsetY) + "px";
357			if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
358			},
359			update: function(event) {
360			if(this.active) {
361			if(!this.dragging) {
362			var style = this.element.style;
363			this.dragging = true;
364			if(style.position=="") style.position = "relative";
365			style.zIndex = this.options.zindex;
366			Draggables.notify('onStart', this);
367			if(this.options.starteffect) this.options.starteffect(this.element);
368			}
369
370			Droppables.show(event, this.element);
371			this.draw(event);
372			if(this.options.change) this.options.change(this);
373
374			// fix AppleWebKit rendering
375			if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
376
377			Event.stop(event);
378			}
379			}
380			}
381
382			/--------------------------------------------------------------------------/
383
384			SortableObserver = Class.create();
385			SortableObserver.prototype = {
386			initialize: function(element, observer) {
387			this.element = $(element);
388			this.observer = observer;
389			this.lastValue = Sortable.serialize(this.element);
390			},
391			onStart: function() {
392			this.lastValue = Sortable.serialize(this.element);
393			},
394			onEnd: function() {
395			if(this.lastValue != Sortable.serialize(this.element))
396			this.observer(this.element)
397			}
398			}
399
400			Sortable = {
401			sortables: new Array(),
402			options: function(element){
403			var element = $(element);
404			for(var i=0;i<this.sortables.length;i++)
405			if(this.sortables[i].element == element)
406			return this.sortables[i];
407			return null;
408			},
409			destroy: function(element){
410			var element = $(element);
411			for(var i=0;i<this.sortables.length;i++) {
412			if(this.sortables[i].element == element) {
413			var s = this.sortables[i];
414			Draggables.removeObserver(s.element);
415			for(var j=0;j<s.droppables.length;j++)
416			Droppables.remove(s.droppables[j]);
417			for(var j=0;j<s.draggables.length;j++)
418			s.draggables[j].destroy();
419			this.sortables.splice(i,1);
420			}
421			}
422			},
423			create: function(element) {
424			var element = $(element);
425			var options = Object.extend({
426			element: element,
427			tag: 'li', // assumes li children, override with tag: 'tagname'
428			overlap: 'vertical', // one of 'vertical', 'horizontal'
429			constraint: 'vertical', // one of 'vertical', 'horizontal', false
430			containment: element, // also takes array of elements (or id's); or false
431			handle: false, // or a CSS class
432			only: false,
433			hoverclass: null,
434			onChange: function() {},
435			onUpdate: function() {}
436			}, arguments[1] \|\| {});
437
438			// clear any old sortable with same element
439			this.destroy(element);
440
441			// build options for the draggables
442			var options_for_draggable = {
443			revert: true,
444			constraint: options.constraint,
445			handle: handle };
446			if(options.starteffect)
447			options_for_draggable.starteffect = options.starteffect;
448			if(options.reverteffect)
449			options_for_draggable.reverteffect = options.reverteffect;
450			if(options.endeffect)
451			options_for_draggable.endeffect = options.endeffect;
452			if(options.zindex)
453			options_for_draggable.zindex = options.zindex;
454
455			// build options for the droppables
456			var options_for_droppable = {
457			overlap: options.overlap,
458			containment: options.containment,
459			hoverclass: options.hoverclass,
460			onHover: function(element, dropon, overlap) {
461			if(overlap>0.5) {
462			if(dropon.previousSibling != element) {
463			var oldParentNode = element.parentNode;
464			element.style.visibility = "hidden"; // fix gecko rendering
465			dropon.parentNode.insertBefore(element, dropon);
466			if(dropon.parentNode!=oldParentNode && oldParentNode.sortable)
467			oldParentNode.sortable.onChange(element);
468			if(dropon.parentNode.sortable)
469			dropon.parentNode.sortable.onChange(element);
470			}
471			} else {
472			var nextElement = dropon.nextSibling \|\| null;
473			if(nextElement != element) {
474			var oldParentNode = element.parentNode;
475			element.style.visibility = "hidden"; // fix gecko rendering
476			dropon.parentNode.insertBefore(element, nextElement);
477			if(dropon.parentNode!=oldParentNode && oldParentNode.sortable)
478			oldParentNode.sortable.onChange(element);
479			if(dropon.parentNode.sortable)
480			dropon.parentNode.sortable.onChange(element);
481			}
482			}
483			}
484			}
485
486			// fix for gecko engine
487			Element.cleanWhitespace(element);
488
489			options.draggables = [];
490			options.droppables = [];
491
492			// make it so
493			var elements = element.childNodes;
494			for (var i = 0; i < elements.length; i++)
495			if(elements[i].tagName && elements[i].tagName==options.tag.toUpperCase() &&
496			(!options.only \|\| (Element.Class.has(elements[i], options.only)))) {
497
498			// handles are per-draggable
499			var handle = options.handle ?
500			Element.Class.childrenWith(elements[i], options.handle)[0] : elements[i];
501
502			options.draggables.push(new Draggable(elements[i], Object.extend(options_for_draggable, { handle: handle })));
503
504			Droppables.add(elements[i], options_for_droppable);
505			options.droppables.push(elements[i]);
506
507			}
508
509			// keep reference
510			this.sortables.push(options);
511
512			// for onupdate
513			Draggables.addObserver(new SortableObserver(element, options.onUpdate));
514
515			},
516			serialize: function(element) {
517			var element = $(element);
518			var sortableOptions = this.options(element);
519			var options = Object.extend({
520			tag: sortableOptions.tag,
521			only: sortableOptions.only,
522			name: element.id
523			}, arguments[1] \|\| {});
524
525			var items = $(element).childNodes;
526			var queryComponents = new Array();
527
528			for(var i=0; i<items.length; i++)
529			if(items[i].tagName && items[i].tagName==options.tag.toUpperCase() &&
530			(!options.only \|\| (Element.Class.has(items[i], options.only))))
531			queryComponents.push(
532			encodeURIComponent(options.name) + "[]=" +
533			encodeURIComponent(items[i].id.split("_")[1]));
534
535			return queryComponents.join("&");
536			}
537			}