Flutter equivalents to `View::onAttachedToWindow` and `View::onDetachedFromWindow`

Question

What are Flutter equivalents to Android's View::onAttachedToWindow and View::onDetachedFromWindow?

Basically, in Flutter, how to determine if user can see a particular widget on screen or is it covered, for example, with another screen on top?

Answer 1

Flutter seem to have limited lifecycle events. Maybe what you're looking for can be achieved by overriding initState() and deactivate(). Checkout widget lifecycle here for more info