How to use

JavadocHover$OpenDeclarationAction

in

org.eclipse.jdt.internal.ui.text.java.hover

final OpenDeclarationAction openDeclarationAction= new OpenDeclarationAction(iControl);
tbm.add(openDeclarationAction);

  @Override
  public void inputChanged(Object newInput) {
    backAction.update();
    forwardAction.update();
    if (newInput == null) {
      selectionProvider.setSelection(new StructuredSelection());
    } else if (newInput instanceof BrowserInformationControlInput) {
      BrowserInformationControlInput input= (BrowserInformationControlInput) newInput;
      Object inputElement= input.getInputElement();
      selectionProvider.setSelection(new StructuredSelection(inputElement));
      boolean isJavaElementInput= inputElement instanceof IJavaElement;
      showInJavadocViewAction.setEnabled(isJavaElementInput);
      openDeclarationAction.setEnabled(isJavaElementInput);
    }
  }
};

public OpenDeclarationAction(BrowserInformationControl infoControl) {
  fInfoControl= infoControl;
  setText(JavaHoverMessages.JavadocHover_openDeclaration);
  JavaPluginImages.setLocalImageDescriptors(this, "goto_input.png"); //$NON-NLS-1$ //TODO: better images
}

public OpenDeclarationAction(BrowserInformationControl infoControl) {
  fInfoControl= infoControl;
  setText(JavaHoverMessages.JavadocHover_openDeclaration);
  JavaPluginImages.setLocalImageDescriptors(this, "goto_input.png"); //$NON-NLS-1$ //TODO: better images
}

  @Override
  public void inputChanged(Object newInput) {
    backAction.update();
    forwardAction.update();
    if (newInput == null) {
      selectionProvider.setSelection(new StructuredSelection());
    } else if (newInput instanceof BrowserInformationControlInput) {
      BrowserInformationControlInput input= (BrowserInformationControlInput) newInput;
      Object inputElement= input.getInputElement();
      selectionProvider.setSelection(new StructuredSelection(inputElement));
      boolean isJavaElementInput= inputElement instanceof IJavaElement;
      showInJavadocViewAction.setEnabled(isJavaElementInput);
      openDeclarationAction.setEnabled(isJavaElementInput);
    }
  }
};

final OpenDeclarationAction openDeclarationAction= new OpenDeclarationAction(iControl);
tbm.add(openDeclarationAction);