drag with move position events?

I'm trying to implement an drag-like UI gesture where the user clicks
on a shape in a canvas, starts dragging it, and event handlers adjust
a value and redraw the canvas, based on the position of the drag. I'm
looking at the java doc for DragStartHandler, et al, but it's sparse.
I thought I'd listen to mousemove, along with the drag events, but it
stops when the drag starts. Is there a way to get the x,y positions
as the drag proceeds? I'd do it all with mouse down, move, and up;
except I loose the mouse-up event if it occurs outside the narrow
canvas element.

Rob

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