RichTextArea do not fire the click event when click the input area

I would like to fire an event when the user click the any place of the RichTextArea, such as any button on the tool bar or the input area. So I used the following code to implement the idea:

richTextArea.AddListener(new LayoutClickListener(){
@Override
public void layoutClick(LayoutClickEvent event){
//my code here …
}
})

By using this way, when the toolbar is clicked, the event is fired as expected. But the event does not fire when the input area was clicked. Could anyone help me out how to fire an event when click the input area.

Thanks,