/**

 * jQuery.LocalScroll

 * Copyright (c) 2007-2008 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com

 * Dual licensed under MIT and GPL.

 * Date: 3/10/2008

 *

 * @projectDescription Animated scrolling navigation, using anchors.

 * http://flesler.blogspot.com/2007/10/jquerylocalscroll-10.html

 * @author Ariel Flesler

 * @version 1.2.5

 *

 * @id jQuery.fn.localScroll

 * @param {Object} settings Hash of settings, it is passed in to jQuery.ScrollTo, none is required.

 * @return {jQuery} Returns the same jQuery object, for chaining.

 *

 * @example $('ul.links').localScroll();

 *

 * @example $('ul.links').localScroll({ filter:'.animated', duration:400, axis:'x' });

 *

 * @example $.localScroll({ target:'#pane', axis:'xy', queue:true, event:'mouseover' });

 *

 * Notes:

 *  - The plugin requires jQuery.ScrollTo.

 *  - The hash of settings, is passed to jQuery.ScrollTo, so the settings are valid for that plugin as well.

 *  - jQuery.localScroll can be used if the desired links, are all over the document, it accepts the same settings.

 *  - If the setting 'lazy' is set to true, then the binding will still work for later added anchors.

 *  - The setting 'speed' is deprecated, use 'duration' instead.

 *  - If onBefore returns false, the event is ignored.

 **/

;(function( $ ){

    var URI = location.href.replace(/#.*/,'');//local url without hash



    var $localScroll = $.localScroll = function( settings ){

        $('body').localScroll( settings );

    };



    //Many of these defaults, belong to jQuery.ScrollTo, check it's demo for an example of each option.

    //@see http://www.freewebs.com/flesler/jQuery.ScrollTo/

    $localScroll.defaults = {//the defaults are public and can be overriden.

        duration:1000, //how long to animate.

        axis:'y',//which of top and left should be modified.

        event:'click',//on which event to react.

        stop:true//avoid queuing animations 

        /*

        lock:false,//ignore events if already animating

        lazy:false,//if true, links can be added later, and will still work.

        target:null, //what to scroll (selector or element). Keep it null if want to scroll the whole window.

        filter:null, //filter some anchors out of the matched elements.

        hash: false//if true, the hash of the selected link, will appear on the address bar.

        */

    };



    //if the URL contains a hash, it will scroll to the pointed element

    $localScroll.hash = function( settings ){

        settings = $.extend( {}, $localScroll.defaults, settings );

        settings.hash = false;//can't be true

        if( location.hash )

            setTimeout(function(){ scroll( 0, location, settings ); }, 0 );//better wrapped with a setTimeout

    };



    $.fn.localScroll = function( settings ){

        settings = $.extend( {}, $localScroll.defaults, settings );



        return ( settings.persistent || settings.lazy ) 

                ? this.bind( settings.event, function( e ){//use event delegation, more links can be added later.

                    var a = $([e.target, e.target.parentNode]).filter(filter)[0];//if a valid link was clicked.

                    a && scroll( e, a, settings );//do scroll.

                })

                : this.find('a')//bind concretely, to each matching link

                        .filter( filter ).bind( settings.event, function(e){

                            scroll( e, this, settings );

                        }).end()

                    .end();



        function filter(){//is this a link that points to an anchor and passes a possible filter ? href is checked to avoid a bug in FF.

            return !!this.href && !!this.hash && this.href.replace(this.hash,'') == URI && (!settings.filter || $(this).is( settings.filter ));

        };

    };



    function scroll( e, link, settings ){

        var id = link.hash.slice(1),

            elem = document.getElementById(id) || document.getElementsByName(id)[0];

        if ( elem ){

            e && e.preventDefault();

            var $target = $( settings.target || $.scrollTo.window() );//if none specified, then the window.



            if( settings.lock && $target.is(':animated') ||

            settings.onBefore && settings.onBefore.call(link, e, elem, $target) === false ) return;



            if( settings.stop )

                $target.queue('fx',[]).stop();//remove all its animations

            $target

                .scrollTo( elem, settings )//do scroll

                .trigger('notify.serialScroll',[elem]);//notify serialScroll about this change

            if( settings.hash )

                $target.queue(function(){

                    location = link.hash;

                });

        }

    };



})( jQuery );