Mouse Methods

• We don't need all the methods, so we'll use the Adapter classes rather than the interfaces
  
  
• We obviously want to use mouseDragged from MouseMotionAdapter


• mouseDragged is not enough, because we don't want dragging across an image to do anything
  
  
• It's convenient to use mousePressed to check for starting a drag, and mouseReleased to end one
  
  
• These are defined in MouseAdapter