How to get position and size of project editor?

How can I get the position and size of the whole editor? (no matter how many files are opened I need the whole area):

This I how I get the current editor and then I apply a VisibleAreaListener:

MyVisibleAreaListener visibleAreaChangedListener = new MyVisibleAreaListener();

EditorFactory.getInstance().getEventMulticaster().addVisibleAreaListener(visibleAreaChangedListener, new Disposable() {
  @Override
  public void dispose() {
    // TODO
  }
});

And the listener:

public class MyVisibleAreaListener implements VisibleAreaListener {

    public void visibleAreaChanged(VisibleAreaEvent event) {
        Rectangle rect = event.getNewRectangle();
        System.out.println("Rect x: " + rect.x + ", Rect y:" + rect.y);
        System.out.println("Rect width: " + rect.width + ", Rect height:" + rect.height);
    }

}

This allows me to get the current width and height of the editor but rect.x and rect.y are always zero