/*
 * jQuery scrollsync Plugin
 * version: 1.0 (30 -Jun-2009)
 * Copyright (c) 2009 Miquel Herrera
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 */
;(function($){ // secure $ jQuery alias

/**
 * Synchronizes scroll of one element (first matching targetSelector filter)
 * with all the rest meaning that the rest of elements scroll will follow the 
 * matched one.
 * 
 * options is composed of the following properties:
 *      ------------------------------------------------------------------------
 *      targetSelector  | A jQuery selector applied to filter. The first element of
 *                                      | the resulting set will be the target all the rest scrolls
 *                                      | will be synchronised against. Defaults to ':first' which 
 *                                      | selects the first element in the set.
 *      ------------------------------------------------------------------------
 *      axis                    | sets the scroll axis which will be synchronised, can be
 *                                      | x, y or xy. Defaults to xy which will synchronise both.
 *      ------------------------------------------------------------------------
 */
$.fn.scrollsync = function( options ){
        var settings = $.extend(
                        {   
                                targetSelector:':first',
                                axis: 'xy'
                        },options || {});
        
        function scrollHandler(event) {
                if (event.data.xaxis){
                        event.data.followers.scrollLeft(event.data.target.scrollLeft());
                }
                if (event.data.yaxis){
                        event.data.followers.scrollTop(event.data.target.scrollTop());
                }
        }
        
        // Find target to follow and separate from followers
        settings.target = this.filter(settings.targetSelector).filter(':first');
        settings.followers=this.not(settings.target); // the rest of elements

        // Parse axis
        settings.xaxis= (settings.axis=='xy' || settings.axis=='x') ? true : false; 
        settings.yaxis= (settings.axis=='xy' || settings.axis=='y') ? true : false;
        if (!settings.xaxis && !settings.yaxis) return;  // No axis left 
        
        // bind scroll event passing array of followers
        settings.target.bind('scroll', settings, scrollHandler);
        
}; // end plugin scrollsync

})( jQuery ); // confine scope