How to use

getSlaveDocumentManager

method

in

org.eclipse.jface.text.TextViewer

/**
 * Initializes the document information mapping between the given slave document and
 * its master document.
 *
 * @param visibleDocument the slave document
 * @since 2.1
 */
protected void initializeDocumentInformationMapping(IDocument visibleDocument) {
  ISlaveDocumentManager manager= getSlaveDocumentManager();
  fInformationMapping= manager == null ? null : manager.createMasterSlaveMapping(visibleDocument);
}

/**
 * Initializes the document information mapping between the given slave document and
 * its master document.
 *
 * @param visibleDocument the slave document
 * @since 2.1
 */
protected void initializeDocumentInformationMapping(IDocument visibleDocument) {
  ISlaveDocumentManager manager= getSlaveDocumentManager();
  fInformationMapping= manager == null ? null : manager.createMasterSlaveMapping(visibleDocument);
}

/**
 * Frees the given document if it is a slave document.
 *
 * @param slave the potential slave document
 * @since 3.0
 */
protected void freeSlaveDocument(IDocument slave) {
  ISlaveDocumentManager manager= getSlaveDocumentManager();
  if (manager != null && manager.isSlaveDocument(slave))
    manager.freeSlaveDocument(slave);
}

/**
 * Frees the given document if it is a slave document.
 *
 * @param slave the potential slave document
 * @since 3.0
 */
protected void freeSlaveDocument(IDocument slave) {
  ISlaveDocumentManager manager= getSlaveDocumentManager();
  if (manager != null && manager.isSlaveDocument(slave))
    manager.freeSlaveDocument(slave);
}

/**
 * Creates a slave document for the given document if there is a slave document manager
 * associated with this viewer.
 *
 * @param document the master document
 * @return the newly created slave document
 * @since 2.1
 */
protected IDocument createSlaveDocument(IDocument document) {
  ISlaveDocumentManager manager= getSlaveDocumentManager();
  if (manager != null) {
    if (manager.isSlaveDocument(document))
      return document;
    return manager.createSlaveDocument(document);
  }
  return document;
}

/**
 * Creates a slave document for the given document if there is a slave document manager
 * associated with this viewer.
 *
 * @param document the master document
 * @return the newly created slave document
 * @since 2.1
 */
protected IDocument createSlaveDocument(IDocument document) {
  ISlaveDocumentManager manager= getSlaveDocumentManager();
  if (manager != null) {
    if (manager.isSlaveDocument(document))
      return document;
    return manager.createSlaveDocument(document);
  }
  return document;
}

@Override
public void resetVisibleRegion() {
  ISlaveDocumentManager manager= getSlaveDocumentManager();
  if (manager != null) {
    IDocument slave= getVisibleDocument();
    IDocument master= manager.getMasterDocument(slave);
    if (master != null) {
      setVisibleDocument(master);
      manager.freeSlaveDocument(slave);
    }
  }
}

@Override
public void resetVisibleRegion() {
  ISlaveDocumentManager manager= getSlaveDocumentManager();
  if (manager != null) {
    IDocument slave= getVisibleDocument();
    IDocument master= manager.getMasterDocument(slave);
    if (master != null) {
      setVisibleDocument(master);
      manager.freeSlaveDocument(slave);
    }
  }
}