How to get readyState from GWT Frame object?

I'm using GWT 2.3.0 in my project and I have an iframe and a loading mask. When the iframe content (to be more specific, the content is a PDF) is loaded I need to hide the loading mask.

I tried using:

Frame frame = new Frame("https://www.example.com.br/example开发者_运维问答.pdf") {{
   addDomHandler(new LoadHandler() {
      public void onLoad(LoadEvent event) {
         loadingMask.setVisible(false);
      }
   }, LoadEvent.getType());
}};

Because of the content is a PDF, it does not work in IE.

Is there a way to get the readyState iframe property with GWT?

I would appreciate any feedback. Thanks for all.

to get the readyState GWT Frame property:

frame.getElement().getAttribute("readyState")

Just override the onLoad() method on Frame:

Frame frame = new Frame("https://www.example.com.br/example.pdf") {
    @Override
    protected void onLoad() {
        super.onLoad();
        loadingMask.setVisible(false);
    }
};