Adds the specified
ViewPortListener to receive view port events.
Currently, view port events include the "view port changed" event and the "selection changed" event. The "view port changed" event occurs when the view port is changed by mouse actions (see
ChartViewer.setMouseUsage), or
ChartViewer.updateViewPort is called. The "selection changed" event occurs when the selection box is changed (becomes visible or invisible or change in size) by "drag to select" mouse actions.
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