get height of a Widget using its GlobalKey in flutter

Question

I am struggling getting the height of a Widget using its GlobalKey. the function that is getting the height is called after the Layout is rendered to make sure the context i

Answer 1

Define your constructor like this:

const MyWidget(GlobalKey key) : super(key:key);.

The framework stores the BuildContext and State object in the Widget.key field which is passed into the object by constructor instead of an arbitary key field.