Expandable Entry?

Hello,

I was wondering if it is possible to obtain the effect of an expandable Entry or Editor control, that expands as you type.
Imagine any instant messaging app, like WhatsApp, your phone's SMS app etc.

There is, at the bottom, what looks like an Entry element where you type your message.
As you keep typing tho, if the text is long enough, the Entry becomes more like a multi-line Editor.

How would you achieve something like that?

Thanks!