pfhwyigou/mobile/web/js/scroll.js

        (function(){
 
            var special = jQuery.event.special,
                uid1 = 'D' + (+new Date()),
                uid2 = 'D' + (+new Date() + 1);
         
            special.scrollstart = {
                setup: function() {
         
                    var timer,
                        handler =  function(evt) {
         
                            var _self = this,
                                _args = arguments;
         
                            if (timer) {
                                clearTimeout(timer);
                            } else {
                                evt.type = 'scrollstart';
                                jQuery.event.dispatch.apply(_self, _args);
                            }
         
                            timer = setTimeout( function(){
                                timer = null;
                            }, special.scrollstop.latency);
         
                        };
         
                    jQuery(this).bind('scroll', handler).data(uid1, handler);
         
                },
                teardown: function(){
                    jQuery(this).unbind( 'scroll', jQuery(this).data(uid1) );
                }
            };
         
            special.scrollstop = {
                latency: 300,
                setup: function() {
         
                    var timer,
                            handler = function(evt) {
         
                            var _self = this,
                                _args = arguments;
         
                            if (timer) {
                                clearTimeout(timer);
                            }
         
                            timer = setTimeout( function(){
         
                                timer = null;
                                evt.type = 'scrollstop';
                                jQuery.event.dispatch.apply(_self, _args);
         
                            }, special.scrollstop.latency);
         
                        };
         
                    jQuery(this).bind('scroll', handler).data(uid2, handler);
         
                },
                teardown: function() {
                    jQuery(this).unbind( 'scroll', jQuery(this).data(uid2) );
                }
            };
         
        })();