dragstart event summary

I know this is a little bit difficult to explain in english

I will just simply try to say

case 

I have to two event library in same div

 1. hammer event 

 2. scroller

problem if hammer drag event catch then 

In hammer Drag event 

I use this function ev.gesture.preventDefault(); then

never scroller working

so I try to delete ev.gesture.preventDefault(); then

hammer "drag" event called irregularly

so I try to find usage of hammer 

then I Found  "dragstart"

dragstart -> drag called

this event tell me chagement of x, Y position

so I can catch the what the people want to do

example)

                    case 'dragstart' : 

var movingX = ev.gesture.deltaX;

var movingY = ev.gesture.deltaY;

if(Math.abs(movingX) > Math.abs(movingY)){  // willing to moving left or right

currentScreenStatus.isLeftScrolling = false;

}else{

currentScreenStatus.isLeftScrolling = true; //willing to mving up or down

}

break;

                   case 'touch':

                        break;

                    case 'drag':

if(currentScreenStatus.isLeftScrolling){   //if up or down will use scroller event

return;

}

                                        ev.gesture.preventDefault();