Ace editor touch devices scrolling

var ace_editor = ace.edit('my-dom-id');
var touch_start_x = 0;
var touch_start_y = 0;
$('.ace_scroller').on('touchstart', function(event){
    touch_start_x = event.originalEvent.touches[0].pageX;
    touch_start_y = event.originalEvent.touches[0].pageY;
});
$('.ace_scroller').on('touchmove', function(e){
    var touch = e.originalEvent.touches[0] || e.originalEvent.changedTouches[0];
    var x = touch.pageX - touch_start_x;
    var y = touch.pageY - touch_start_y;
    // now move
    cms_ace_editor.renderer.scrollBy(x,y);
});