Flutter Zoomable Widget

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As of Flutter 1.20, InteractiveViewer widget supports pan and Zoom out of the box.
To make any widget zoomable you need to simply wrap the child with InteractiveViewer.

@override
Widget build(BuildContext context) {
  return Center(
    child: InteractiveViewer(
      panEnabled: false, // Set it to false to prevent panning. 
      boundaryMargin: EdgeInsets.all(80),
      minScale: 0.5,
      maxScale: 4, 
      child: FlutterLogo(size: 200),
    ),
  );
}

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