pass value to other widget without goto page flutter code example

Example 1: get position of a widget in screen flutter

extension GlobalKeyEx on GlobalKey {
  Rect get globalPaintBounds {
    final renderObject = currentContext?.findRenderObject();
    var translation = renderObject?.getTransformTo(null)?.getTranslation();
    if (translation != null && renderObject.paintBounds != null) {
      return renderObject.paintBounds
          .shift(Offset(translation.x, translation.y));
    } else {
      return null;
    }
  }
}

Example 2: get position of a widget in screen flutter

//creating Key for red panelGlobalKey _keyRed = GlobalKey();...//set key    Flexible(             flex: 2,             child: Container(               key: _keyRed,               color: Colors.red,             ),     ),

Example 3: pass string to a provider flutter

class SecondPage extends StatelessWidget {  final Data data;  SecondPage({this.data});  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text(‘Constructor — second page’),      ),      body: Container(        padding: EdgeInsets.all(12.0),        alignment: Alignment.center,        child: Column(          children: <Widget>[            Container(              height: 54.0,              padding: EdgeInsets.all(12.0),              child: Text(‘Data passed to this page:’,               style: TextStyle(fontWeight: FontWeight.w700))),            Text(‘Text: ${data.text}’),            Text(‘Counter: ${data.counter}’),            Text(‘Date: ${data.dateTime}’),          ],        ),      ),    );  }}

Example 4: pass string to a provider flutter

_secondPage(BuildContext context, Widget page) async {    final dataFromSecondPage = await Navigator.push(  context,  MaterialPageRoute(builder: (context) => page),  ) as Data;  // Here we have the data from the second screen  data.counter = dataFromSecondPage.counter;  data.dateTime = dataFromSecondPage.dateTime;  data.text = dataFromSecondPage.text;}