web/wp-includes/js/scriptaculous/slider.js
author Anthony Ly <anthonyly.com@gmail.com>
Wed, 19 Dec 2012 12:35:13 -0800
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// script.aculo.us slider.js v1.8.3, Thu Oct 08 11:23:33 +0200 2009
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// Copyright (c) 2005-2009 Marty Haught, Thomas Fuchs
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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 (!Control) var Control = { };
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// options:
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//  axis: 'vertical', or 'horizontal' (default)
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//
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// callbacks:
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//  onChange(value)
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//  onSlide(value)
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Control.Slider = Class.create({
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  initialize: function(handle, track, options) {
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    var slider = this;
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    if (Object.isArray(handle)) {
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      this.handles = handle.collect( function(e) { return $(e) });
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    } else {
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      this.handles = [$(handle)];
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    }
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    this.track   = $(track);
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    this.options = options || { };
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    this.axis      = this.options.axis || 'horizontal';
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    this.increment = this.options.increment || 1;
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    this.step      = parseInt(this.options.step || '1');
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    this.range     = this.options.range || $R(0,1);
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    this.value     = 0; // assure backwards compat
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    this.values    = this.handles.map( function() { return 0 });
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    this.spans     = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false;
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    this.options.startSpan = $(this.options.startSpan || null);
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    this.options.endSpan   = $(this.options.endSpan || null);
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    this.restricted = this.options.restricted || false;
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    this.maximum   = this.options.maximum || this.range.end;
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    this.minimum   = this.options.minimum || this.range.start;
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    // Will be used to align the handle onto the track, if necessary
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    this.alignX = parseInt(this.options.alignX || '0');
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    this.alignY = parseInt(this.options.alignY || '0');
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    this.trackLength = this.maximumOffset() - this.minimumOffset();
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    this.handleLength = this.isVertical() ?
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      (this.handles[0].offsetHeight != 0 ?
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        this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/,"")) :
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      (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth :
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        this.handles[0].style.width.replace(/px$/,""));
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    this.active   = false;
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    this.dragging = false;
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    this.disabled = false;
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    if (this.options.disabled) this.setDisabled();
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    // Allowed values array
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    this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
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    if (this.allowedValues) {
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      this.minimum = this.allowedValues.min();
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      this.maximum = this.allowedValues.max();
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    }
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    this.eventMouseDown = this.startDrag.bindAsEventListener(this);
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    this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
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    this.eventMouseMove = this.update.bindAsEventListener(this);
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    // Initialize handles in reverse (make sure first handle is active)
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    this.handles.each( function(h,i) {
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      i = slider.handles.length-1-i;
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      slider.setValue(parseFloat(
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        (Object.isArray(slider.options.sliderValue) ?
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          slider.options.sliderValue[i] : slider.options.sliderValue) ||
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         slider.range.start), i);
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      h.makePositioned().observe("mousedown", slider.eventMouseDown);
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    });
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    this.track.observe("mousedown", this.eventMouseDown);
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    document.observe("mouseup", this.eventMouseUp);
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    document.observe("mousemove", this.eventMouseMove);
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    this.initialized = true;
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  },
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  dispose: function() {
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    var slider = this;
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    Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
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    Event.stopObserving(document, "mouseup", this.eventMouseUp);
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    Event.stopObserving(document, "mousemove", this.eventMouseMove);
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    this.handles.each( function(h) {
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      Event.stopObserving(h, "mousedown", slider.eventMouseDown);
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    });
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  },
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  setDisabled: function(){
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    this.disabled = true;
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  },
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  setEnabled: function(){
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    this.disabled = false;
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  },
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  getNearestValue: function(value){
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    if (this.allowedValues){
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      if (value >= this.allowedValues.max()) return(this.allowedValues.max());
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      if (value <= this.allowedValues.min()) return(this.allowedValues.min());
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      var offset = Math.abs(this.allowedValues[0] - value);
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      var newValue = this.allowedValues[0];
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      this.allowedValues.each( function(v) {
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        var currentOffset = Math.abs(v - value);
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        if (currentOffset <= offset){
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          newValue = v;
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          offset = currentOffset;
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        }
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      });
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      return newValue;
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    }
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    if (value > this.range.end) return this.range.end;
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    if (value < this.range.start) return this.range.start;
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    return value;
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  },
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  setValue: function(sliderValue, handleIdx){
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    if (!this.active) {
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      this.activeHandleIdx = handleIdx || 0;
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      this.activeHandle    = this.handles[this.activeHandleIdx];
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      this.updateStyles();
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    }
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    handleIdx = handleIdx || this.activeHandleIdx || 0;
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    if (this.initialized && this.restricted) {
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      if ((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
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        sliderValue = this.values[handleIdx-1];
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      if ((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))
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        sliderValue = this.values[handleIdx+1];
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    }
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    sliderValue = this.getNearestValue(sliderValue);
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    this.values[handleIdx] = sliderValue;
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    this.value = this.values[0]; // assure backwards compat
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    this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] =
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      this.translateToPx(sliderValue);
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    this.drawSpans();
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    if (!this.dragging || !this.event) this.updateFinished();
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  },
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  setValueBy: function(delta, handleIdx) {
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    this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta,
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      handleIdx || this.activeHandleIdx || 0);
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  },
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  translateToPx: function(value) {
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    return Math.round(
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      ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) *
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      (value - this.range.start)) + "px";
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  },
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  translateToValue: function(offset) {
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    return ((offset/(this.trackLength-this.handleLength) *
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      (this.range.end-this.range.start)) + this.range.start);
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  },
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  getRange: function(range) {
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    var v = this.values.sortBy(Prototype.K);
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    range = range || 0;
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    return $R(v[range],v[range+1]);
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  },
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  minimumOffset: function(){
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    return(this.isVertical() ? this.alignY : this.alignX);
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  },
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  maximumOffset: function(){
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    return(this.isVertical() ?
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      (this.track.offsetHeight != 0 ? this.track.offsetHeight :
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        this.track.style.height.replace(/px$/,"")) - this.alignY :
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      (this.track.offsetWidth != 0 ? this.track.offsetWidth :
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        this.track.style.width.replace(/px$/,"")) - this.alignX);
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  },
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  isVertical:  function(){
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    return (this.axis == 'vertical');
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  },
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  drawSpans: function() {
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    var slider = this;
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    if (this.spans)
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      $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });
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    if (this.options.startSpan)
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      this.setSpan(this.options.startSpan,
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        $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));
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    if (this.options.endSpan)
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      this.setSpan(this.options.endSpan,
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        $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));
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  },
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  setSpan: function(span, range) {
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    if (this.isVertical()) {
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      span.style.top = this.translateToPx(range.start);
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      span.style.height = this.translateToPx(range.end - range.start + this.range.start);
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    } else {
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      span.style.left = this.translateToPx(range.start);
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      span.style.width = this.translateToPx(range.end - range.start + this.range.start);
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    }
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  },
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  updateStyles: function() {
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    this.handles.each( function(h){ Element.removeClassName(h, 'selected') });
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    Element.addClassName(this.activeHandle, 'selected');
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  },
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  startDrag: function(event) {
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    if (Event.isLeftClick(event)) {
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      if (!this.disabled){
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        this.active = true;
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        var handle = Event.element(event);
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        var pointer  = [Event.pointerX(event), Event.pointerY(event)];
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        var track = handle;
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        if (track==this.track) {
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          var offsets  = this.track.cumulativeOffset();
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          this.event = event;
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          this.setValue(this.translateToValue(
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           (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)
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          ));
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          var offsets  = this.activeHandle.cumulativeOffset();
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          this.offsetX = (pointer[0] - offsets[0]);
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          this.offsetY = (pointer[1] - offsets[1]);
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        } else {
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          // find the handle (prevents issues with Safari)
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          while((this.handles.indexOf(handle) == -1) && handle.parentNode)
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            handle = handle.parentNode;
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          if (this.handles.indexOf(handle)!=-1) {
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            this.activeHandle    = handle;
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            this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
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            this.updateStyles();
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            var offsets  = this.activeHandle.cumulativeOffset();
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            this.offsetX = (pointer[0] - offsets[0]);
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            this.offsetY = (pointer[1] - offsets[1]);
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          }
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        }
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      }
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      Event.stop(event);
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    }
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  },
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  update: function(event) {
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   if (this.active) {
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      if (!this.dragging) this.dragging = true;
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      this.draw(event);
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      if (Prototype.Browser.WebKit) window.scrollBy(0,0);
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      Event.stop(event);
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   }
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  },
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  draw: function(event) {
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    var pointer = [Event.pointerX(event), Event.pointerY(event)];
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    var offsets = this.track.cumulativeOffset();
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    pointer[0] -= this.offsetX + offsets[0];
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    pointer[1] -= this.offsetY + offsets[1];
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    this.event = event;
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    this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
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    if (this.initialized && this.options.onSlide)
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      this.options.onSlide(this.values.length>1 ? this.values : this.value, this);
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  },
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  endDrag: function(event) {
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    if (this.active && this.dragging) {
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      this.finishDrag(event, true);
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      Event.stop(event);
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    }
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    this.active = false;
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    this.dragging = false;
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  },
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  finishDrag: function(event, success) {
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    this.active = false;
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    this.dragging = false;
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    this.updateFinished();
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  },
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  updateFinished: function() {
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    if (this.initialized && this.options.onChange)
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      this.options.onChange(this.values.length>1 ? this.values : this.value, this);
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    this.event = null;
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  }
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});