root/galaxy-central/static/scripts/jquery.event.hover.js @ 2

;(function($){ // secure $ jQuery alias
/*******************************************************************************************/   
// jquery.event.hover.js - rev 5 
// Copyright (c) 2008, Three Dub Media (http://threedubmedia.com)
// Liscensed under the MIT License (MIT-LICENSE.txt)
// http://www.opensource.org/licenses/mit-license.php
// Created: 2008-06-02 | Updated: 2008-07-30
/*******************************************************************************************/

//      USE THESE PROPERTIES TO CUSTOMIZE SETTINGS...

//      $.event.special.hover.delay = 100; 
//      Defines the delay (msec) while mouse is inside the element before checking the speed

//      $.event.special.hover.speed = 100; 
//      Defines the maximum speed (px/sec) the mouse may be moving to trigger the hover event

// save the old jquery "hover" method
$.fn._hover = $.fn.hover;

// jquery method 
$.fn.hover = function( fn1, fn2, fn3 ) {
        if ( fn3 ) this.bind('hoverstart', fn1 ); // 3 args
        if ( fn2 ) this.bind('hoverend', fn3 ? fn3 : fn2 ); // 2+ args
        return !fn1 ? this.trigger('hover') // 0 args 
                : this.bind('hover', fn3 ? fn2 : fn1 ); // 1+ args
        };      

// special event configuration
var hover = $.event.special.hover = {
        delay: 100, // milliseconds
        speed: 100, // pixels per second
        setup: function( data ){
                data = $.extend({ speed: hover.speed, delay: hover.delay, hovered:0 }, data||{} );
                $.event.add( this, "mouseenter mouseleave", hoverHandler, data );
                },
        teardown: function(){
                $.event.remove( this, "mouseenter mouseleave", hoverHandler );
                }
        };

// shared event handler
function hoverHandler( event ){
        var data = event.data || event;
        switch ( event.type ){
                case 'mouseenter': // mouseover
                        data.dist2 = 0; // init mouse distanceｲ
                        data.event = event; // store the event
                        event.type = "hoverstart"; // hijack event
                        if ( $.event.handle.call( this, event ) !== false ){ // handle "hoverstart"
                                data.elem = this; // ref to the current element
                                $.event.add( this, "mousemove", hoverHandler, data ); // track the mouse
                                data.timer = setTimeout( compare, data.delay ); // start async compare
                                }
                        break;
                case 'mousemove': // track the event, mouse distanceｲ = xｲ + yｲ
                        data.dist2 += Math.pow( event.pageX-data.event.pageX, 2 ) 
                                + Math.pow( event.pageY-data.event.pageY, 2 ); 
                        data.event = event; // store current event
                        break;
                case 'mouseleave': // mouseout
                        clearTimeout( data.timer ); // uncompare
                        if ( data.hovered ){ 
                                event.type = "hoverend"; // hijack event
                                $.event.handle.call( this, event ); // handle "hoverend"
                                data.hovered--; // reset flag
                                }
                        else $.event.remove( data.elem, "mousemove", hoverHandler ); // untrack
                        break;
                default: // timeout compare // distanceｲ = xｲ + yｲ  = ( speed * time )ｲ
                        if ( data.dist2 <= Math.pow( data.speed*( data.delay/1e3 ), 2 ) ){ // speed acceptable
                                $.event.remove( data.elem, "mousemove", hoverHandler ); // untrack
                                data.event.type = "hover"; // hijack event
                                if ( $.event.handle.call( data.elem, data.event ) !== false ) // handle "hover"
                                        data.hovered++; // flag for "hoverend"
                                }
                        else data.timer = setTimeout( compare, data.delay ); // async recurse
                        data.dist2 = 0; // reset distanceｲ for next compare
                        break;
                }
        function compare(){ hoverHandler( data ); }; // timeout/recursive function
        };
        
/*******************************************************************************************/
})(jQuery); // confine scope