How to use

IAnnotationHoverExtension2

in

org.eclipse.jface.text.source

@Override
protected Point computeLocation(Rectangle subjectArea, Point controlSize, Anchor anchor) {
  MouseEvent event= getHoverEvent();
  IAnnotationHover hover= getHover(event);
  boolean allowMouseExit= false;
  if (hover instanceof IAnnotationHoverExtension) {
    IAnnotationHoverExtension extension= (IAnnotationHoverExtension) hover;
    allowMouseExit= extension.canHandleMouseCursor();
  }
  boolean hideOnMouseWheel= true;
  if (hover instanceof IAnnotationHoverExtension2) {
    IAnnotationHoverExtension2 extension= (IAnnotationHoverExtension2) hover;
    hideOnMouseWheel= !extension.canHandleMouseWheel();
  }
  fHideOnMouseWheel= hideOnMouseWheel;
  if (allowMouseExit) {
    fAllowMouseExit= true;
    Control subjectControl= getSubjectControl();
    // return a location that just overlaps the annotation on the bar
    if (anchor == AbstractInformationControlManager.ANCHOR_RIGHT)
      return subjectControl.toDisplay(subjectArea.x - 4, subjectArea.y - 2);
    else if (anchor == AbstractInformationControlManager.ANCHOR_LEFT)
      return subjectControl.toDisplay(subjectArea.x + subjectArea.width - controlSize.x + 4, subjectArea.y - 2);
  }
  fAllowMouseExit= false;
  return super.computeLocation(subjectArea, controlSize, anchor);
}

@Override
protected Point computeLocation(Rectangle subjectArea, Point controlSize, Anchor anchor) {
  MouseEvent event= getHoverEvent();
  IAnnotationHover hover= getHover(event);
  boolean allowMouseExit= false;
  if (hover instanceof IAnnotationHoverExtension) {
    IAnnotationHoverExtension extension= (IAnnotationHoverExtension) hover;
    allowMouseExit= extension.canHandleMouseCursor();
  }
  boolean hideOnMouseWheel= true;
  if (hover instanceof IAnnotationHoverExtension2) {
    IAnnotationHoverExtension2 extension= (IAnnotationHoverExtension2) hover;
    hideOnMouseWheel= !extension.canHandleMouseWheel();
  }
  fHideOnMouseWheel= hideOnMouseWheel;
  if (allowMouseExit) {
    fAllowMouseExit= true;
    Control subjectControl= getSubjectControl();
    // return a location that just overlaps the annotation on the bar
    if (anchor == AbstractInformationControlManager.ANCHOR_RIGHT)
      return subjectControl.toDisplay(subjectArea.x - 4, subjectArea.y - 2);
    else if (anchor == AbstractInformationControlManager.ANCHOR_LEFT)
      return subjectControl.toDisplay(subjectArea.x + subjectArea.width - controlSize.x + 4, subjectArea.y - 2);
  }
  fAllowMouseExit= false;
  return super.computeLocation(subjectArea, controlSize, anchor);
}