How to use

ensureHoverControlManagerInstalled

method

in

org.eclipse.jface.text.TextViewer

@Override
public void setTextHover(ITextHover hover, String contentType, int stateMask) {
  TextHoverKey key= new TextHoverKey(contentType, stateMask);
  if (hover != null) {
    if (fTextHovers == null) {
      fTextHovers= new HashMap<>();
    }
    fTextHovers.put(key, hover);
  } else if (fTextHovers != null)
    fTextHovers.remove(key);
  ensureHoverControlManagerInstalled();
}

@Override
public void setTextHover(ITextHover hover, String contentType, int stateMask) {
  TextHoverKey key= new TextHoverKey(contentType, stateMask);
  if (hover != null) {
    if (fTextHovers == null) {
      fTextHovers= new HashMap<>();
    }
    fTextHovers.put(key, hover);
  } else if (fTextHovers != null)
    fTextHovers.remove(key);
  ensureHoverControlManagerInstalled();
}

@Override
public void activatePlugins() {
  if (fDoubleClickStrategies != null && !fDoubleClickStrategies.isEmpty() && fDoubleClickStrategyConnector == null) {
    fDoubleClickStrategyConnector= new TextDoubleClickStrategyConnector();
    fTextWidget.addWordMovementListener(fDoubleClickStrategyConnector);
    fTextWidget.addMouseListener(fDoubleClickStrategyConnector);
  }
  ensureHoverControlManagerInstalled();
  ensureHyperlinkManagerInstalled();
  if (fUndoManager != null) {
    fUndoManager.connect(this);
    fUndoManager.reset();
  }
}

@Override
public void activatePlugins() {
  if (fDoubleClickStrategies != null && !fDoubleClickStrategies.isEmpty() && fDoubleClickStrategyConnector == null) {
    fDoubleClickStrategyConnector= new TextDoubleClickStrategyConnector();
    fTextWidget.addWordMovementListener(fDoubleClickStrategyConnector);
    fTextWidget.addMouseListener(fDoubleClickStrategyConnector);
  }
  ensureHoverControlManagerInstalled();
  ensureHyperlinkManagerInstalled();
  if (fUndoManager != null) {
    fUndoManager.connect(this);
    fUndoManager.reset();
  }
}