Update external tool when you add data source to app
dataSourceChangeListener( provides an
option to update the external tool when a new data source is loaded into the
Ground Truth Labeler app. The app
calls this method using the
connectorObj object. You can
optionally use this method to react to a new data source being connected to the
A new data source can be a video, image sequence, or custom reader. You can load a new data source while loading a new session.