// script.aculo.us slider.js v1.6.5, Wed Nov 08 14:17:49 CET 2006

// Copyright (c) 2005, 2006 Marty Haught, Thomas Fuchs 
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

if(!Control) var Control = {};
Control.Slider = Class.create();

// options:
//  axis: 'vertical', or 'horizontal' (default)
//
// callbacks:
//  onChange(value)
//  onSlide(value)
Control.Slider.prototype = {
  initialize: function(handle, track, options) {
    var slider = this;
    
    if(handle instanceof Array) {
      this.handles = handle.collect( function(e) { return $(e) });
    } else {
      this.handles = [$(handle)];
    }
    
    this.track = $(track);
    this.options = options || {};

    this.axis = this.options.axis || 'horizontal';
    this.increment = this.options.increment || 1;
    this.step = parseInt(this.options.step || '1');
    this.range = this.options.range || $R(0,1);
    
     _proxy_jslib_assign('', this, 'value', '=', ( 0)); // assure backwards compat
    this.values = this.handles.map( function() { return 0 });
    this.spans = this.options.spans ? this.options.spans.map(function(s) { return $(s) }) : false;
    this.options.startSpan = $(this.options.startSpan || null);
    this.options.endSpan = $(this.options.endSpan || null);

    this.restricted = this.options.restricted || false;

    this.maximum = this.options.maximum || this.range.end;
    this.minimum = this.options.minimum || this.range.start;

    // Will be used to align the handle onto the track, if necessary
    this.alignX = parseInt(this.options.alignX || '0');
    this.alignY = parseInt(this.options.alignY || '0');
    
    this.trackLength = this.maximumOffset() - this.minimumOffset();

    this.handleLength = this.isVertical() ? 
      (this.handles[0].offsetHeight != 0 ? 
        this.handles[0].offsetHeight :  _proxy_jslib_handle(this.handles[0].style.height, 'replace', '', 1, 0)(/px$/,"")) : 
      (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth : 
         _proxy_jslib_handle(this.handles[0].style.width, 'replace', '', 1, 0)(/px$/,""));

    this.active = false;
    this.dragging = false;
    this.disabled = false;

    if(this.options.disabled) this.setDisabled();

    // Allowed values array
    this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
    if(this.allowedValues) {
      this.minimum = this.allowedValues.min();
      this.maximum = this.allowedValues.max();
    }

    this.eventMouseDown = this.startDrag.bindAsEventListener(this);
    this.eventMouseUp = this.endDrag.bindAsEventListener(this);
    this.eventMouseMove = this.update.bindAsEventListener(this);

    // Initialize handles in reverse (make sure first handle is active)
    this.handles.each( function(h,i) {
      i = slider.handles.length-1-i;
      slider.setValue(parseFloat(
        (slider.options.sliderValue instanceof Array ? 
           _proxy_jslib_handle(slider.options.sliderValue, (i), 0, 0) : slider.options.sliderValue) || 
         slider.range.start), i);
      Element.makePositioned(h); // fix IE
      Event.observe(h, "mousedown", slider.eventMouseDown);
    });
    
    Event.observe(this.track, "mousedown", this.eventMouseDown);
    Event.observe(document, "mouseup", this.eventMouseUp);
    Event.observe(document, "mousemove", this.eventMouseMove);
    
    this.initialized = true;
  },
  dispose: function() {
    var slider = this;    
    Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
    Event.stopObserving(document, "mouseup", this.eventMouseUp);
    Event.stopObserving(document, "mousemove", this.eventMouseMove);
    this.handles.each( function(h) {
      Event.stopObserving(h, "mousedown", slider.eventMouseDown);
    });
  },
  setDisabled: function() {
    this.disabled = true;
  },
  setEnabled: function() {
    this.disabled = false;
  },  
  getNearestValue: function(value) {
    if(this.allowedValues){
      if( _proxy_jslib_handle(null, 'value', value, 0, 0) >= this.allowedValues.max()) return(this.allowedValues.max());
      if( _proxy_jslib_handle(null, 'value', value, 0, 0) <= this.allowedValues.min()) return(this.allowedValues.min());
      
      var offset = Math.abs(this.allowedValues[0] -  _proxy_jslib_handle(null, 'value', value, 0, 0));
      var newValue = this.allowedValues[0];
      this.allowedValues.each( function(v) {
        var currentOffset = Math.abs(v -  _proxy_jslib_handle(null, 'value', value, 0, 0));
        if(currentOffset <= offset){
          newValue = v;
          offset = currentOffset;
        } 
      });
      return newValue;
    }
    if( _proxy_jslib_handle(null, 'value', value, 0, 0) > this.range.end) return this.range.end;
    if( _proxy_jslib_handle(null, 'value', value, 0, 0) < this.range.start) return this.range.start;
    return  _proxy_jslib_handle(null, 'value', value, 0, 0);
  },
  setValue: function(sliderValue, handleIdx) {
    if(!this.active) {
      this.activeHandleIdx = handleIdx || 0;
      this.activeHandle =  _proxy_jslib_handle(this.handles, (this.activeHandleIdx), 0, 0);
      this.updateStyles();
    }
    handleIdx = handleIdx || this.activeHandleIdx || 0;
    if(this.initialized && this.restricted) {
      if((handleIdx>0) && (sliderValue< _proxy_jslib_handle(this.values, (handleIdx-1), 0, 0)))
        sliderValue =  _proxy_jslib_handle(this.values, (handleIdx-1), 0, 0);
      if((handleIdx < (this.handles.length-1)) && (sliderValue> _proxy_jslib_handle(this.values, (handleIdx+1), 0, 0)))
        sliderValue =  _proxy_jslib_handle(this.values, (handleIdx+1), 0, 0);
    }
    sliderValue = this.getNearestValue(sliderValue);
     _proxy_jslib_assign('', this.values, (handleIdx), '=', ( sliderValue));
     _proxy_jslib_assign('', this, 'value', '=', ( this.values[0])); // assure backwards compat
    
     _proxy_jslib_assign('',  _proxy_jslib_handle(this.handles, (handleIdx), 0, 0).style, (this.isVertical() ? 'top' : 'left'), '=', ( 
      this.translateToPx(sliderValue)));
    
    this.drawSpans();
    if(!this.dragging || !this.event) this.updateFinished();
  },
  setValueBy: function(delta, handleIdx) {
    this.setValue( _proxy_jslib_handle(this.values, (handleIdx || this.activeHandleIdx || 0), 0, 0) + delta, 
      handleIdx || this.activeHandleIdx || 0);
  },
  translateToPx: function(value) {
    return Math.round(
      ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) * 
      ( _proxy_jslib_handle(null, 'value', value, 0, 0) - this.range.start)) + "px";
  },
  translateToValue: function(offset) {
    return ((offset/(this.trackLength-this.handleLength) * 
      (this.range.end-this.range.start)) + this.range.start);
  },
  getRange: function(range) {
    var v = this.values.sortBy(Prototype.K); 
    range = range || 0;
    return $R( _proxy_jslib_handle(v, (range), 0, 0), _proxy_jslib_handle(v, (range+1), 0, 0));
  },
  minimumOffset: function() {
    return(this.isVertical() ? this.alignY : this.alignX);
  },
  maximumOffset: function() {
    return(this.isVertical() ? 
      (this.track.offsetHeight != 0 ? this.track.offsetHeight :
         _proxy_jslib_handle(this.track.style.height, 'replace', '', 1, 0)(/px$/,"")) - this.alignY : 
      (this.track.offsetWidth != 0 ? this.track.offsetWidth : 
         _proxy_jslib_handle(this.track.style.width, 'replace', '', 1, 0)(/px$/,"")) - this.alignY);
  },  
  isVertical:  function() {
    return (this.axis == 'vertical');
  },
  drawSpans: function() {
    var slider = this;
    if(this.spans)
      $R(0, this.spans.length-1).each(function(r) { slider.setSpan( _proxy_jslib_handle(slider.spans, (r), 0, 0), slider.getRange(r)) });
    if(this.options.startSpan)
      this.setSpan(this.options.startSpan,
        $R(0, this.values.length>1 ? this.getRange(0).min() :  _proxy_jslib_handle(this, 'value', '', 0, 0) ));
    if(this.options.endSpan)
      this.setSpan(this.options.endSpan, 
        $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() :  _proxy_jslib_handle(this, 'value', '', 0, 0), this.maximum));
  },
  setSpan: function(span, range) {
    if(this.isVertical()) {
       _proxy_jslib_assign('', span.style, 'top', '=', ( this.translateToPx(range.start)));
      span.style.height = this.translateToPx(range.end - range.start + this.range.start);
    } else {
      span.style.left = this.translateToPx(range.start);
      span.style.width = this.translateToPx(range.end - range.start + this.range.start);
    }
  },
  updateStyles: function() {
    this.handles.each( function(h) { Element.removeClassName(h, 'selected') });
    Element.addClassName(this.activeHandle, 'selected');
  },
  startDrag: function(event) {
    if(Event.isLeftClick(event)) {
      if(!this.disabled){
        this.active = true;
        
        var handle = Event.element(event);
        var pointer  = [Event.pointerX(event), Event.pointerY(event)];
        var track = handle;
        if(track==this.track) {
          var offsets  = Position.cumulativeOffset(this.track); 
          this.event = event;
          this.setValue(this.translateToValue( 
           (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)
 ));
          var offsets  = Position.cumulativeOffset(this.activeHandle);
          this.offsetX = (pointer[0] - offsets[0]);
          this.offsetY = (pointer[1] - offsets[1]);
        } else {
          // find the handle (prevents issues with Safari)
          while((this.handles.indexOf(handle) == -1) && handle.parentNode) 
            handle = handle.parentNode;
            
          if(this.handles.indexOf(handle)!=-1) {
            this.activeHandle = handle;
            this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
            this.updateStyles();
            
            var offsets  = Position.cumulativeOffset(this.activeHandle);
            this.offsetX = (pointer[0] - offsets[0]);
            this.offsetY = (pointer[1] - offsets[1]);
          }
        }
      }
      Event.stop(event);
    }
  },
  update: function(event) {
   if(this.active) {
      if(!this.dragging) this.dragging = true;
      this.draw(event);
      // fix AppleWebKit rendering
      if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
      Event.stop(event);
   }
  },
  draw: function(event) {
    var pointer = [Event.pointerX(event), Event.pointerY(event)];
    var offsets = Position.cumulativeOffset(this.track);
    pointer[0] -= this.offsetX + offsets[0];
    pointer[1] -= this.offsetY + offsets[1];
    this.event = event;
    this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
    if(this.initialized && this.options.onSlide)
      this.options.onSlide(this.values.length>1 ? this.values :  _proxy_jslib_handle(this, 'value', '', 0, 0), this);
  },
  endDrag: function(event) {
    if(this.active && this.dragging) {
      this.finishDrag(event, true);
      Event.stop(event);
    }
    this.active = false;
    this.dragging = false;
  },  
  finishDrag: function(event, success) {
    this.active = false;
    this.dragging = false;
    this.updateFinished();
  },
  updateFinished: function() {
    if(this.initialized && this.options.onChange) 
      this.options.onChange(this.values.length>1 ? this.values :  _proxy_jslib_handle(this, 'value', '', 0, 0), this);
    this.event = null;
  }
} ;
_proxy_jslib_flush_write_buffers() ;