How to use

IProjectionListener

in

org.eclipse.jface.text.source.projection

/**
 * Notifies all registered projection listeners
 * that projection mode has been enabled.
 */
protected void fireProjectionEnabled() {
  if (fProjectionListeners != null) {
    Iterator<IProjectionListener> e= new ArrayList<>(fProjectionListeners).iterator();
    while (e.hasNext()) {
      IProjectionListener l= e.next();
      l.projectionEnabled();
    }
  }
}

/**
 * Notifies all registered projection listeners
 * that projection mode has been disabled.
 */
protected void fireProjectionDisabled() {
  if (fProjectionListeners != null) {
    Iterator<IProjectionListener> e= new ArrayList<>(fProjectionListeners).iterator();
    while (e.hasNext()) {
      IProjectionListener l= e.next();
      l.projectionDisabled();
    }
  }
}

/**
 * Notifies all registered projection listeners
 * that projection mode has been disabled.
 */
protected void fireProjectionDisabled() {
  if (fProjectionListeners != null) {
    Iterator<IProjectionListener> e= new ArrayList<>(fProjectionListeners).iterator();
    while (e.hasNext()) {
      IProjectionListener l= e.next();
      l.projectionDisabled();
    }
  }
}

/**
 * Notifies all registered projection listeners
 * that projection mode has been enabled.
 */
protected void fireProjectionEnabled() {
  if (fProjectionListeners != null) {
    Iterator<IProjectionListener> e= new ArrayList<>(fProjectionListeners).iterator();
    while (e.hasNext()) {
      IProjectionListener l= e.next();
      l.projectionEnabled();
    }
  }
}