title: Using drag mouse handlers with GWT canvas
body: <p>I am currently developing a paint-like application for GWT. I would like to add a mouse handler that runs when the user drags the mouse across the canvas(like making a square,etc;), the problem is that I'm not surewhat handler to use. Looking through the handlers implemented in canvas has lead me to some hints, but the documentation as to what event the apply to is scant. </p>
  
  <p>Does anyone know how I should implement it? Thanks. </p>