Question 187850 in Flutter Question posted in
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Flutter – Method to find the height of list of widgets?

I was trying to find the heights of individual widget in listview. Method I followed is as followed-

  1. Make a list of global keys and assign it to individual container widget.
  2. Then use this function function
  3. It is giving me error that currentContext is not defined Error
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2

Answers


  1. 0

    You should use a GlobalKey and template it depending on the state it is holding if this is the case.

    // If you are holding a statefulWidget
final myKey = GlobalKey<YourState>();

// else
final myKey = GlobalKey();
...
RenderBox renderBox = myKey.currentContext.findRenderObject();

    You can also use the LayoutBuilder to wrap your child widget with and get their height.

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  2. 0

    This is valid code calculateHeight() fill fix ur problem.

    

class MyHomePage extends StatefulWidget {
  const MyHomePage({
    super.key,
  });

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey _key = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Center(
      child: SizedBox(
        key: _key,
        width: 200,
        height: 200,
      ),
    ));
  }

  double calculateHeight() {
    final renderObject = _key.currentContext?.findRenderObject();
    if (renderObject == null) return 0;
    if (renderObject is! RenderBox) return 0;
    return renderObject.size.height;
  }
}
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