gistfile1.n

[Unit]
class Draggable
{
  public OffsetX : int { get; set; }
  public OffsetY : int { get; set; }

  public this(moveHandler = null, downHandler = null, upHandler = null)
  {}

  public Handler() : void
  {
    event mousedown( c ) {
      downHandler(c);
      event mousemove( m ) {
        moveHandler( m )
        OffsetX = c.posx - m.posx;
        OffsetY = c.posy - m.posy;
      } until mouseup ( u ) {
        upHandler( u );
      }      
    }
  }
}


[Page]
class Page
{
  public DivDraggable : Draggable { get; set; }

  <div bind="$DivDraggable.Handler" style-left="$(DivDraggable.OffsetX)" />
}