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1 lines
1.4 KiB
1 lines
1.4 KiB
define(["jquery"],function(a){var b={SCROLL_THRESHOLD:30,SCROLL_FREQUENCY:1e3/60,SCROLL_SPEED:.5,scrollingId:null,scrollAmount:0,callback:null,start:function(c){a(window).on("mousemove",b.mouseMove),a(window).on("touchmove",b.touchMove),b.callback=c},stop:function(){a(window).off("mousemove",b.mouseMove),a(window).off("touchmove",b.touchMove),null!==b.scrollingId&&b.stopScrolling()},touchMove:function(a){for(var c=0;c<a.changedTouches.length;c++)b.handleMove(a.changedTouches[c].clientX,a.changedTouches[c].clientY)},mouseMove:function(a){b.handleMove(a.clientX,a.clientY)},handleMove:function(c,d){d<b.SCROLL_THRESHOLD?b.scrollAmount=-Math.min(b.SCROLL_THRESHOLD-d,b.SCROLL_THRESHOLD):d>a(window).height()-b.SCROLL_THRESHOLD?b.scrollAmount=Math.min(d-(a(window).height()-b.SCROLL_THRESHOLD),b.SCROLL_THRESHOLD):b.scrollAmount=0,b.scrollAmount&&null===b.scrollingId?b.startScrolling():b.scrollAmount||null===b.scrollingId||b.stopScrolling()},startScrolling:function(){var c=a(document).height()-a(window).height();b.scrollingId=window.setInterval(function(){var d=a(window).scrollTop(),e=Math.round(b.scrollAmount*b.SCROLL_SPEED);if(d+e<0&&(e=-d),d+e>c&&(e=c-d),0!==e){a(window).scrollTop(d+e);var f=a(window).scrollTop()-d;0!==f&&b.callback&&b.callback(f)}},b.SCROLL_FREQUENCY)},stopScrolling:function(){window.clearInterval(b.scrollingId),b.scrollingId=null}};return{start:b.start,stop:b.stop}});
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