/**
 * jquery.keyboard-focus.js (defines classes for when focus was obtained via the keyboard)
 * @version 0.3
 * @author Andrew Ramsden
 * @see http://irama.org/web/dhtml/key-focus/
 * @license Common Public License Version 1.0 <http://www.opensource.org/licenses/cpl1.0.txt>
 * @requires jQuery (tested with version 1.3.1) <http://jquery.com/>
 */
if (typeof jQuery == 'undefined') {
    if (console && console.log) { console.log('Keyboard Focus plugin could not be initialised because jQuery is not available'); }
} else { /* Start if jQuery exists */
jQuery.keyFocus = {};
jQuery.keyFocus.conf = {
    keyFocusClass : 'keyboard-focus',
    mouseFocusClass : 'mouse-focus',
    focusClass : 'focus',
    mouseTimeout  : 50
};
(function($){ /* start closure (protects variables from global scope) */
    
    $(document).ready(function(){
        $('body').trackFocus();
    });
    
    /**
     * @see http://www.w3.org/TR/wai-aria-practices/#kbd_generalnav
     * @param DOMNode this The container element that acts as "toolbar" for the controls.
     * @param jQuerySelector controlSelector Individual controls to navigate between.
     * @param Object options A set of options to override the $.AKN.defaultOptions. 
     */
    $.fn.trackFocus = function () {
        $(this).data('last-device-used', '');
        
        $(this)
            .bind('mousedown', function(e){
                $(this).data('last-device-used', 'mouse');
                $(this).data('last-device-used-when', new Date().getTime());
            })
            .bind('keydown', function(e){
                $(this).data('last-device-used', 'keyboard');
            })
            .bind('focusin', function(e){
                // Keyboard events sometimes go undetected (if tabbing in from outside the document,
                // but mouse clicks used to focus will always be closely
                // followed by the focus event. Clearing the last-device-used
                // after a short timeout and assuming keyboard when no device is known
                // works!
                    if ($(this).data('last-device-used') != 'mouse' || new Date().getTime()-50 > $(this).data('last-device-used-when')) {
                        $(e.target).addClass($.keyFocus.conf.keyFocusClass);
                    } else {
                        $(e.target).addClass($.keyFocus.conf.mouseFocusClass);
                    }
                    $(e.target).addClass($.keyFocus.conf.focusClass);
            })
            .bind('focusout', function(e){
                $('.'+$.keyFocus.conf.keyFocusClass+', .'+$.keyFocus.conf.mouseFocusClass).removeClass($.keyFocus.conf.keyFocusClass+' '+$.keyFocus.conf.mouseFocusClass);
                $(e.target).removeClass($.keyFocus.conf.focusClass);
            })
        ;
    };
        
    
    
})(jQuery); /* end closure */
} /* end if jQuery exists */