Getting the correct editor width and height.

Hi there.

I'm trying to find a way to get the editor text area  width and height,

I saw this piece of code on stackoverflow

editor.ui.space( 'contents' ).getStyle( 'height' ); // e.g. 200px

But unfortunately it dosen't return the true size when scroll bars are in operation, does anyone know what method I would use to get the correct width and height dimensions of the editor text area.

Regards

Brett