if(typeof(Prototype)=="undefined")throw"Control.ScrollBar requires Prototype to be loaded.";if(typeof(Control.Slider)=="undefined")throw"Control.ScrollBar requires Control.Slider to be loaded.";if(typeof(Object.Event)=="undefined")throw"Control.ScrollBar requires Object.Event to be loaded.";Control.ScrollBar=Class.create({initialize:function(container,track,options){this.enabled=false;this.notificationTimeout=false;this.container=$(container).parentNode;this.boundResizeObserver=this.onWindowResize.bind(this);this.track=$(track);this.handle=this.track.firstDescendant();this.options=Object.extend({active_class_name:'scrolling',apply_active_class_name_to:this.container,notification_timeout_length:125,handle_minimum_width:100,scroll_to_smoothing:10,scroll_to_steps:200,proportional:true,slider_options:{}},options||{});this.slider=new Control.Slider(this.handle,this.track,Object.extend({axis:'horizontal',onSlide:this.onChange.bind(this),onChange:this.onChange.bind(this)},this.options.slider_options));this.recalculateLayout();Event.observe(window,'resize',this.boundResizeObserver);this.handle.observe('mousedown',function(){if(this.auto_sliding_executer)this.auto_sliding_executer.stop()}.bind(this))},destroy:function(){Event.stopObserving(window,'resize',this.boundResizeObserver)},enable:function(){this.enabled=true;this.slider.setEnabled();$(this.track.parentNode.id).show();this.track.show();if(this.options.active_class_name)$(this.options.apply_active_class_name_to).addClassName(this.options.active_class_name);this.notify('enabled')},disable:function(){this.enabled=false;this.slider.setDisabled();this.track.hide();$(this.track.parentNode.id).hide();if(this.options.active_class_name)$(this.options.apply_active_class_name_to).removeClassName(this.options.active_class_name);this.notify('disabled');this.reset()},reset:function(){this.slider.setValue(0)},recalculateLayout:function(){if(this.container.scrollWidth<=this.container.offsetWidth){this.disable()}else{this.slider.trackLength=this.slider.maximumOffset()-this.slider.minimumOffset();if(this.options.proportional){this.handle.style.width=Math.max(this.track.offsetWidth*(this.container.offsetWidth/this.container.scrollWidth),this.options.handle_minimum_width)+'px'; this.slider.handleLength=this.handle.style.width.replace(/px/,'')}this.enable()}},onWindowResize:function(){$(this.track.parentNode.id).show();this.track.show();this.recalculateLayout();this.scrollBy(0)},onMouseWheel:function(event){if(this.auto_sliding_executer)this.auto_sliding_executer.stop();this.slider.setValueBy(-(event.memo.delta/20)); event.stop();return false},onChange:function(value){this.container.scrollLeft=Math.round(value/this.slider.maximum*(this.container.scrollWidth-this.container.offsetWidth));if(this.notification_timeout)window.clearTimeout(this.notificationTimeout);this.notificationTimeout=window.setTimeout(function(){this.notify('change',value)}.bind(this),this.options.notification_timeout_length)},getCurrentMaximumDelta:function(){return this.slider.maximum*(this.container.scrollWidth-this.container.offsetWidth)},getDeltaToElement:function(element){return this.slider.maximum*((element.positionedOffset().left+(element.getWidth()/2))-(this.container.getWidth()/2))},scrollTo:function(x,animate){var current_maximum_delta=this.getCurrentMaximumDelta();if(x=='left')x=0;else if(x=='right')x=current_maximum_delta;else if(typeof(x)!="number")x=this.getDeltaToElement($(x));if(this.enabled){x=Math.max(0,Math.min(x,current_maximum_delta));if(this.auto_sliding_executer)this.auto_sliding_executer.stop();var target_value=x/current_maximum_delta;var original_slider_value=this.slider.value;var delta=(target_value-original_slider_value)*current_maximum_delta;if(animate){this.auto_sliding_executer=new PeriodicalExecuter(function(){if(Math.round(this.slider.value*100)/100<Math.round(target_value*100)/ 100 || Math.round(this.slider.value * 100)/100>Math.round(target_value*100)/100){this.scrollBy(delta/this.options.scroll_to_steps)}else{this.auto_sliding_executer.stop();this.auto_sliding_executer=null;if(typeof(animate)=="function")animate()}}.bind(this),this.options.scroll_to_smoothing)}else this.scrollBy(delta)}else if(typeof(animate)=="function")animate()},scrollBy:function(x){if(!this.enabled)return false;this.slider.setValueBy(x/this.getCurrentMaximumDelta())}});Object.Event.extend(Control.ScrollBar);