effects.js

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// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// Contributors:
//  Justin Palmer (http://encytemedia.com/)
//  Mark Pilgrim (http://diveintomark.org/)
//  Martin Bialasinki
// 
// See scriptaculous.js for full license.  

// converts rgb() and #xxx to #xxxxxx format,  
// returns self (or first argument) if not convertable  
String.prototype.parseColor = function() {  
  var color = '#';  
  if(this.slice(0,4) == 'rgb(') {  
    var cols = this.slice(4,this.length-1).split(',');  
    var i=0; do { color += parseInt(cols[i]).toColorPart() } while (++i<3);  
  } else {  
    if(this.slice(0,1) == '#') {  
      if(this.length==4) for(var i=1;i<4;i++) color += (this.charAt(i) + this.charAt(i)).toLowerCase();  
      if(this.length==7) color = this.toLowerCase();  
    }  
  }  
  return(color.length==7 ? color : (arguments[0] || this));  
}

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

Element.collectTextNodes = function(element) {  
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue : 
      (node.hasChildNodes() ? Element.collectTextNodes(node) : ''));
  }).flatten().join('');
}

Element.collectTextNodesIgnoreClass = function(element, className) {  
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue : 
      ((node.hasChildNodes() && !Element.hasClassName(node,className)) ? 
        Element.collectTextNodesIgnoreClass(node, className) : ''));
  }).flatten().join('');
}

Element.setContentZoom = function(element, percent) {
  element = $(element);  
  Element.setStyle(element, {fontSize: (percent/100) + 'em'});   
  if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
}

Element.getOpacity = function(element){  
  var opacity;
  if (opacity = Element.getStyle(element, 'opacity'))  
    return parseFloat(opacity);  
  if (opacity = (Element.getStyle(element, 'filter') || '').match(/alpha\(opacity=(.*)\)/))  
    if(opacity[1]) return parseFloat(opacity[1]) / 100;  
  return 1.0;  
}

Element.setOpacity = function(element, value){  
  element= $(element);  
  if (value == 1){
    Element.setStyle(element, { opacity: 
      (/Gecko/.test(navigator.userAgent) && !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 
      0.999999 : null });
    if(/MSIE/.test(navigator.userAgent))  
      Element.setStyle(element, {filter: Element.getStyle(element,'filter').replace(/alpha\([^\)]*\)/gi,'')});  
  } else {  
    if(value < 0.00001) value = 0;  
    Element.setStyle(element, {opacity: value});
    if(/MSIE/.test(navigator.userAgent))  
     Element.setStyle(element, 
       { filter: Element.getStyle(element,'filter').replace(/alpha\([^\)]*\)/gi,'') +
                 'alpha(opacity='+value*100+')' });  
  }
}  
 
Element.getInlineOpacity = function(element){  
  return $(element).style.opacity || '';
}  

Element.childrenWithClassName = function(element, className, findFirst) {
  return [$A($(element).getElementsByTagName('*'))[findFirst ? 'detect' : 'select']( function(c) { 
    return c.className ? Element.hasClassName(c, className) : false;
  })].flatten();
}

Element.forceRerendering = function(element) {
  try {
    element = $(element);
    var n = document.createTextNode(' ');
    element.appendChild(n);
    element.removeChild(n);
  } catch(e) { }
};

['setOpacity','getOpacity','getInlineOpacity','forceRerendering','setContentZoom',
 'collectTextNodes','collectTextNodesIgnoreClass','childrenWithClassName'].each( 
  function(f) { Element.Methods[f] = Element[f]; } 
);

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

Array.prototype.call = function() {
  var args = arguments;
  this.each(function(f){ f.apply(this, args) });
}

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

var Effect = {
  tagifyText: function(element) {
    var tagifyStyle = 'position:relative';
    if(/MSIE/.test(navigator.userAgent)) tagifyStyle += ';zoom:1';
    element = $(element);
    $A(element.childNodes).each( function(child) {
      if(child.nodeType==3) {
        child.nodeValue.toArray().each( function(character) {
          element.insertBefore(
            Builder.node('span',{style: tagifyStyle},
              character == ' ' ? String.fromCharCode(160) : character), 
              child);
        });
        Element.remove(child);
      }
    });
  },
  multiple: function(element, effect) {
    var elements;
    if(((typeof element == 'object') || 
        (typeof element == 'function')) && 
       (element.length))
      elements = element;
    else
      elements = $(element).childNodes;
      
    var options = Object.extend({
      speed: 0.1,
      delay: 0.0
    }, arguments[2] || {});
    var masterDelay = options.delay;

    $A(elements).each( function(element, index) {
      new effect(element, Object.extend(options, { delay: index * options.speed + masterDelay }));
    });
  },
  PAIRS: {
    'slide':  ['SlideDown','SlideUp'],
    'blind':  ['BlindDown','BlindUp'],
    'appear': ['Appear','Fade']
  },
  toggle: function(element, effect) {
    element = $(element);
    effect = (effect || 'appear').toLowerCase();
    var options = Object.extend({
      queue: { position:'end', scope:(element.id || 'global'), limit: 1 }
    }, arguments[2] || {});
    Effect[element.visible() ? 
      Effect.PAIRS[effect][1] : Effect.PAIRS[effect][0]](element, options);
  }
};

var Effect2 = Effect; // deprecated

/* ------------- transitions ------------- */

Effect.Transitions = {}

Effect.Transitions.linear = function(pos) {
  return pos;
}
Effect.Transitions.sinoidal = function(pos) {
  return (-Math.cos(pos*Math.PI)/2) + 0.5;
}
Effect.Transitions.reverse  = function(pos) {
  return 1-pos;
}
Effect.Transitions.flicker = function(pos) {
  return ((-Math.cos(pos*Math.PI)/4) + 0.75) + Math.random()/4;
}
Effect.Transitions.wobble = function(pos) {
  return (-Math.cos(pos*Math.PI*(9*pos))/2) + 0.5;
}
Effect.Transitions.pulse = function(pos) {
  return (Math.floor(pos*10) % 2 == 0 ? 
    (pos*10-Math.floor(pos*10)) : 1-(pos*10-Math.floor(pos*10)));
}
Effect.Transitions.none = function(pos) {
  return 0;
}
Effect.Transitions.full = function(pos) {
  return 1;
}

/* ------------- core effects ------------- */

Effect.ScopedQueue = Class.create();
Object.extend(Object.extend(Effect.ScopedQueue.prototype, Enumerable), {
  initialize: function() {
    this.effects  = [];
    this.interval = null;
  },
  _each: function(iterator) {
    this.effects._each(iterator);
  },
  add: function(effect) {
    var timestamp = new Date().getTime();
    
    var position = (typeof effect.options.queue == 'string') ? 
      effect.options.queue : effect.options.queue.position;
    
    switch(position) {
      case 'front':
        // move unstarted effects after this effect  
        this.effects.findAll(function(e){ return e.state=='idle' }).each( function(e) {
            e.startOn  += effect.finishOn;
            e.finishOn += effect.finishOn;
          });
        break;
      case 'end':
        // start effect after last queued effect has finished
        timestamp = this.effects.pluck('finishOn').max() || timestamp;
        break;
    }
    
    effect.startOn  += timestamp;
    effect.finishOn += timestamp;

    if(!effect.options.queue.limit || (this.effects.length < effect.options.queue.limit))
      this.effects.push(effect);
    
    if(!this.interval) 
      this.interval = setInterval(this.loop.bind(this), 40);
  },
  remove: function(effect) {
    this.effects = this.effects.reject(function(e) { return e==effect });
    if(this.effects.length == 0) {
      clearInterval(this.interval);
      this.interval = null;
    }
  },
  loop: function() {
    var timePos = new Date().getTime();
    this.effects.invoke('loop', timePos);
  }
});

Effect.Queues = {
  instances: $H(),
  get: function(queueName) {
    if(typeof queueName != 'string') return queueName;
    
    if(!this.instances[queueName])
      this.instances[queueName] = new Effect.ScopedQueue();
      
    return this.instances[queueName];
  }
}
Effect.Queue = Effect.Queues.get('global');

Effect.DefaultOptions = {
  transition: Effect.Transitions.sinoidal,
  duration:   1.0,   // seconds
  fps:        25.0,  // max. 25fps due to Effect.Queue implementation
  sync:       false, // true for combining
  from:       0.0,
  to:         1.0,
  delay:      0.0,
  queue:      'parallel'
}

Effect.Base = function() {};
Effect.Base.prototype = {
  position: null,
  start: function(options) {
    this.options      = Object.extend(Object.extend({},Effect.DefaultOptions), options || {});
    this.currentFrame = 0;
    this.state        = 'idle';
    this.startOn      = this.options.delay*1000;
    this.finishOn     = this.startOn + (this.options.duration*1000);
    this.event('beforeStart');
    if(!this.options.sync)
      Effect.Queues.get(typeof this.options.queue == 'string' ? 
        'global' : this.options.queue.scope).add(this);
  },
  loop: function(timePos) {
    if(timePos >= this.startOn) {
      if(timePos >= this.finishOn) {
        this.render(1.0);
        this.cancel();
        this.event('beforeFinish');
        if(this.finish) this.finish(); 
        this.event('afterFinish');
        return;  
      }
      var pos   = (timePos - this.startOn) / (this.finishOn - this.startOn);
      var frame = Math.round(pos * this.options.fps * this.options.duration);
      if(frame > this.currentFrame) {
        this.render(pos);
        this.currentFrame = frame;
      }
    }
  },
  render: function(pos) {
    if(this.state == 'idle') {
      this.state = 'running';
      this.event('beforeSetup');
      if(this.setup) this.setup();
      this.event('afterSetup');
    }
    if(this.state == 'running') {
      if(this.options.transition) pos = this.options.transition(pos);
      pos *= (this.options.to-this.options.from);
      pos += this.options.from;
      this.position = pos;
      this.event('beforeUpdate');
      if(this.update) this.update(pos);
      this.event('afterUpdate');
    }
  },
  cancel: function() {