DART

flutter fittedbox

Container(
      height: 200,
      width: 200,
      color: Colors.red,
      child: FittedBox(
        alignment: Alignment.center,
        clipBehavior: Clip.none,
        child: Image.network('https://flutter.github.io/assets-for-api-docs/assets/widgets/owl-2.jpg'),
        fit: BoxFit.fill,
      ),
    ),

fitted box flutter

Container(
height:200, width:20,
child:FittedBox(
      child: Text('Some Example Text.'))
)
//In this example fitted box helps text to fit in the container even if it have
//to increase or scale the size of text(its child)...