Set movingOffset progmatically

[spstrademark]

Hello,

i am developing an application with multiple draggable objects that are in within of a div element with #myBounds that look like this :

<div #myBounds id="main-content" >
    <window  *ngFor="let item of itemss | async; index as i;"   [item]="item" [bounds]="myBounds" ></window>
</div>

the children have the following div content

<div>
     [bounds]="bounds"
     [inBounds]="true"
     ngDraggable
     (started)="onEventBegin($event)"
     (stopped)="onEventEnd($event)"
     (rzStart)="onEventBegin($event)"
     (rzStop)="onEventEnd($event)"
     ngResizable [rzHandles]="'n,e,s,w,se,sw,ne,nw'"
     rzMinHeight="200"
     rzMinWidth="200"
     [preventDefaultEvent]="true"
>
...
</div>

these elements are created dynamically by the user which he can drag around.
When the application is closed and reopened i want to have the old positions of the elements before it was closed.
I am saving the data width, height and transform in onEventEnd($event).
My question is how can i set the property movingOffset in the child div that it is being shown here https://xieziyu.github.io/angular2-draggable/#/draggable/usage/events programatically?

Thank you for your time!