/**
 * @author Ryan Johnson <http://syntacticx.com/>
 * @copyright 2008 PersonalGrid Corporation <http://personalgrid.com/>
 * @package LivePipe UI
 * @license MIT
 * @url http://livepipe.net/core
 * @require prototype.js
 */

if(typeof(Control) == 'undefined')
    Control = {};
    
var $proc = function(proc){
    return typeof(proc) == 'function' ? proc : function(){return proc};
};

var $value = function(value){
    return typeof(value) == 'function' ? value() : value;
};

Object.Event = {
    extend: function(object){
        object._objectEventSetup = function(event_name){
            this._observers = this._observers || {};
            this._observers[event_name] = this._observers[event_name] || [];
        };
        object.observe = function(event_name,observer){
            if(typeof(event_name) == 'string' && typeof(observer) != 'undefined'){
                this._objectEventSetup(event_name);
                if(!this._observers[event_name].include(observer))
                    this._observers[event_name].push(observer);
            }else
                for(var e in event_name)
                    this.observe(e,event_name[e]);
        };
        object.stopObserving = function(event_name,observer){
            this._objectEventSetup(event_name);
            if(event_name && observer)
                this._observers[event_name] = this._observers[event_name].without(observer);
            else if(event_name)
                this._observers[event_name] = [];
            else
                this._observers = {};
        };
        object.observeOnce = function(event_name,outer_observer){
            var inner_observer = function(){
                outer_observer.apply(this,arguments);
                this.stopObserving(event_name,inner_observer);
            }.bind(this);
            this._objectEventSetup(event_name);
            this._observers[event_name].push(inner_observer);
        };
        object.notify = function(event_name){
            this._objectEventSetup(event_name);
            var collected_return_values = [];
            var args = $A(arguments).slice(1);
            try{
                for(var i = 0; i < this._observers[event_name].length; ++i)
                    collected_return_values.push(this._observers[event_name][i].apply(this._observers[event_name][i],args) || null);
            }catch(e){
                if(e == $break)
                    return false;
                else
                    throw e;
            }
            return collected_return_values;
        };
        if(object.prototype){
            object.prototype._objectEventSetup = object._objectEventSetup;
            object.prototype.observe = object.observe;
            object.prototype.stopObserving = object.stopObserving;
            object.prototype.observeOnce = object.observeOnce;
            object.prototype.notify = function(event_name){
                if(object.notify){
                    var args = $A(arguments).slice(1);
                    args.unshift(this);
                    args.unshift(event_name);
                    object.notify.apply(object,args);
                }
                this._objectEventSetup(event_name);
                var args = $A(arguments).slice(1);
                var collected_return_values = [];
                try{
                    if(this.options && this.options[event_name] && typeof(this.options[event_name]) == 'function')
                        collected_return_values.push(this.options[event_name].apply(this,args) || null);
                    for(var i = 0; i < this._observers[event_name].length; ++i)
                        collected_return_values.push(this._observers[event_name][i].apply(this._observers[event_name][i],args) || null);
                }catch(e){
                    if(e == $break)
                        return false;
                    else
                        throw e;
                }
                return collected_return_values;
            };
        }
    }
};

/* Begin Core Extensions */

//Element.observeOnce
Element.addMethods({
    observeOnce: function(element,event_name,outer_callback){
        var inner_callback = function(){
            outer_callback.apply(this,arguments);
            Element.stopObserving(element,event_name,inner_callback);
        };
        Element.observe(element,event_name,inner_callback);
    }
});

//mouse:wheel
(function(){
    function wheel(event){
        var delta, element, custom_event;
        // normalize the delta
        if (event.wheelDelta) { // IE & Opera
            delta = event.wheelDelta / 120;
        } else if (event.detail) { // W3C
            delta =- event.detail / 3;
        }
		if (capa == 'galeria')
			colocarImagenes();
        if (!delta) { return; }
        element = Event.extend(event).target;
        element = Element.extend(element.nodeType === Node.TEXT_NODE ? element.parentNode : element);
        custom_event = element.fire('mouse:wheel',{ delta: delta });
        if (custom_event.stopped) {
            Event.stop(event);
            return false;
        }
    }
    document.observe('mousewheel',wheel);
    document.observe('DOMMouseScroll',wheel);
})();

/* End Core Extensions */

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);
        this.boundMouseWheelEvent = this.onMouseWheel.bindAsEventListener(this);
        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_height: 25,
            scroll_to_smoothing: 0.01,
            scroll_to_steps: 15,
            proportional: true,
            slider_options: {}
        },options || {});
        this.slider = new Control.Slider(this.handle,this.track,Object.extend({
            axis: 'vertical',
            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.container.observe('mouse:wheel',this.boundMouseWheelEvent);
        this.slider.setEnabled();
        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.container.stopObserving('mouse:wheel',this.boundMouseWheelEvent);
        this.slider.setDisabled();
        this.track.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.scrollHeight <= this.container.offsetHeight)
            this.disable();
        else{
            this.enable();
            this.slider.trackLength = this.slider.maximumOffset() - this.slider.minimumOffset();
            if(this.options.proportional){
                this.handle.style.height = Math.max(this.container.offsetHeight * (this.container.offsetHeight / this.container.scrollHeight),this.options.handle_minimum_height) + 'px';
                this.slider.handleLength = this.handle.style.height.replace(/px/,'');
            }
        }
    },
    onWindowResize: function(){
        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)); //put in math to account for the window height
        event.stop();
        return false;
    },
    onChange: function(value){
        this.container.scrollTop = Math.round(value / this.slider.maximum * (this.container.scrollHeight - this.container.offsetHeight));
        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.scrollHeight - this.container.offsetHeight);
    },
    getDeltaToElement: function(element){
        return this.slider.maximum * ((element.positionedOffset().top + (element.getHeight() / 2)) - (this.container.getHeight() / 2));
    },
    scrollTo: function(y,animate){
        var current_maximum_delta = this.getCurrentMaximumDelta();
        if(y == 'top')
            y = 0;
        else if(y == 'bottom')
            y = current_maximum_delta;
        else if(typeof(y) != "number")
            y = this.getDeltaToElement($(y));
        if(this.enabled){
            y = Math.max(0,Math.min(y,current_maximum_delta));
            if(this.auto_sliding_executer)
                this.auto_sliding_executer.stop();
            var target_value = y / 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(y){
        if(!this.enabled)
            return false;
        this.slider.setValueBy(y / this.getCurrentMaximumDelta());
    }
});
Object.Event.extend(Control.ScrollBar);