A subclass of Ext.dd.DragTracker which handles dragging any Component.
This is configured with a Component to be made draggable, and a config object for the Ext.dd.DragTracker
A delegate may be provided which may be either the element to use as the mousedown target or a Ext.DomQuery selector to activate multiple mousedown targets.
When the Component begins to be dragged, its beginDrag method will be called if implemented.
When the drag ends, its endDrag method will be called if implemented.
Specify as true to constrain the Component to within the bounds of the constrainTo region.
Specify as true to constrain the drag handles within the constrainTo region.