How to use

setVisibleDocument

method

in

org.eclipse.jface.text.TextViewer

@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);
    }
  }
}

@Override
public void setDocument(IDocument document) {
  fReplaceTextPresentation= true;
  fireInputDocumentAboutToBeChanged(fDocument, document);
  IDocument oldDocument= fDocument;
  fDocument= document;
  setVisibleDocument(fDocument);
  resetPlugins();
  inputChanged(fDocument, oldDocument);
  fireInputDocumentChanged(oldDocument, fDocument);
  fLastSentSelectionChange= null;
  fReplaceTextPresentation= false;
}

@Override
public void setDocument(IDocument document) {
  fReplaceTextPresentation= true;
  fireInputDocumentAboutToBeChanged(fDocument, document);
  IDocument oldDocument= fDocument;
  fDocument= document;
  setVisibleDocument(fDocument);
  resetPlugins();
  inputChanged(fDocument, oldDocument);
  fireInputDocumentChanged(oldDocument, fDocument);
  fLastSentSelectionChange= null;
  fReplaceTextPresentation= false;
}

@Override
public void setDocument(IDocument document, int modelRangeOffset, int modelRangeLength) {
  fReplaceTextPresentation= true;
  fireInputDocumentAboutToBeChanged(fDocument, document);
  IDocument oldDocument= fDocument;
  fDocument= document;
  try {
    IDocument slaveDocument= createSlaveDocument(document);
    updateSlaveDocument(slaveDocument, modelRangeOffset, modelRangeLength);
    setVisibleDocument(slaveDocument);
  } catch (BadLocationException x) {
    throw new IllegalArgumentException(JFaceTextMessages.getString("TextViewer.error.invalid_visible_region_1")); //$NON-NLS-1$
  }
  resetPlugins();
  inputChanged(fDocument, oldDocument);
  fireInputDocumentChanged(oldDocument, fDocument);
  fLastSentSelectionChange= null;
  fReplaceTextPresentation= false;
}

@Override
public void setDocument(IDocument document, int modelRangeOffset, int modelRangeLength) {
  fReplaceTextPresentation= true;
  fireInputDocumentAboutToBeChanged(fDocument, document);
  IDocument oldDocument= fDocument;
  fDocument= document;
  try {
    IDocument slaveDocument= createSlaveDocument(document);
    updateSlaveDocument(slaveDocument, modelRangeOffset, modelRangeLength);
    setVisibleDocument(slaveDocument);
  } catch (BadLocationException x) {
    throw new IllegalArgumentException(JFaceTextMessages.getString("TextViewer.error.invalid_visible_region_1")); //$NON-NLS-1$
  }
  resetPlugins();
  inputChanged(fDocument, oldDocument);
  fireInputDocumentChanged(oldDocument, fDocument);
  fLastSentSelectionChange= null;
  fReplaceTextPresentation= false;
}

@Override
public void setVisibleRegion(int start, int length) {
  IRegion region= getVisibleRegion();
  if (start == region.getOffset() && length == region.getLength()) {
    // nothing to change
    return;
  }
  setRedraw(false);
  try {
    IDocument slaveDocument= createSlaveDocument(getVisibleDocument());
    if (updateSlaveDocument(slaveDocument, start, length))
      setVisibleDocument(slaveDocument);
  } catch (BadLocationException x) {
    throw new IllegalArgumentException(JFaceTextMessages.getString("TextViewer.error.invalid_visible_region_2")); //$NON-NLS-1$
  } finally {
    setRedraw(true);
  }
}

@Override
public void setVisibleRegion(int start, int length) {
  IRegion region= getVisibleRegion();
  if (start == region.getOffset() && length == region.getLength()) {
    // nothing to change
    return;
  }
  setRedraw(false);
  try {
    IDocument slaveDocument= createSlaveDocument(getVisibleDocument());
    if (updateSlaveDocument(slaveDocument, start, length))
      setVisibleDocument(slaveDocument);
  } catch (BadLocationException x) {
    throw new IllegalArgumentException(JFaceTextMessages.getString("TextViewer.error.invalid_visible_region_2")); //$NON-NLS-1$
  } finally {
    setRedraw(true);
  }
}