dataMatrixSize property
Define the size that is used to encode the amount of data.
Defaults to DataMatrixSize.auto.
Also refer DataMatrixSize.
Widget build(BuildContext context) {
   return Container(
       child: SfBarcodeGenerator(value:'123456',
       symbology: DataMatrix( dataMatrixSize: DataMatrixSize.size52x52,
           )));
}
```dart
Implementation
final DataMatrixSize dataMatrixSize;