Flutter layout builder

var container = new Container(
  // Toggling width from 100 to 300 will change what is rendered
  // in the child container
  width: 100.0,
  // width: 300.0
  child: new LayoutBuilder(
    builder: (BuildContext context, BoxConstraints constraints) {
      if(constraints.maxWidth > 200.0) {
        return new Text('BIG');
      } else {
        return new Text('SMALL');
      }
    }
  ),
);

Source: stackoverflow.com

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