Guarantee globalkey in super constructor

Asked Nov 05 '21 at 11:38

Active Nov 05 '21 at 11:38

Viewed 188 times

I have a StatefulWidget InfoWidget and I want to make sure it always has a key. I'm not able to provide a default value because it has to be constant. When I try to create a GlobalKey in the super constructor call I get a lot of [ERROR] { exception: Null check operator used on a null value errors in the app (everytime I want to access the currentContext key.currentContext!...)

InfoWidget(
  {required this.child,
  Key? key,
  : super(key: key ?? GlobalKey<InfoWidgetState>());

How is it possible for the key to be Null?

asked Nov 05 '21 at 11:38

user16909654

Where exactly are you calling `key.currentContext!`. I think the key works fine, but when you're calling it, the context hasn't been initiated yet – dumazy Nov 05 '21 at 11:44
why don't you make it a required argument for that widget? – pedro pimont Nov 05 '21 at 11:52
@dumazy, InfoWidget is used as a wrapper for other Widgets anywhere in the app. We just wrap like this: `return InfoWidget( ... child: this, )` – user16909654 Nov 05 '21 at 12:56
Yes, but where are you calling `key.currentContext!`? – dumazy Nov 05 '21 at 13:07
@dumazy, Error is seen in flutter widgets like EditableText `r.2521: RenderEditable get renderEditable => _editableKey.currentContext!.findRenderObject()! as RenderEditable;` – user16909654 Nov 05 '21 at 13:18
In general: is this the way to create a default value for a key? – user16909654 Nov 08 '21 at 09:54

Guarantee globalkey in super constructor

0 Answers0