Instances of this class implement rubber banding rectangles that are drawn onto a parent Composite or Display. These rectangles can be specified to respond to mouse and key events by either moving or resizing themselves accordingly. Trackers are typically used to represent window geometries in a lightweight manner.

Styles:

LEFT, RIGHT, UP, DOWN, RESIZE

Events:

Move, Resize

Note: Rectangle move behavior is assumed unless RESIZE is specified.

IMPORTANT: This class is not intended to be subclassed.