Flutter camera preview (full screen)

main.dart

final mediaSize = MediaQuery.of(context).size;
final scale = 1 / (controller.value.aspectRatio * mediaSize.aspectRatio);
return ClipRect(
  clipper: _MediaSizeClipper(mediaSize),
  child: Transform.scale(
    scale: scale,
    alignment: Alignment.topCenter,
    child: CameraPreview(controller),
  ),
);
class _MediaSizeClipper extends CustomClipper<Rect> {
  final Size mediaSize;
  const _MediaSizeClipper(this.mediaSize);
  @override
  Rect getClip(Size size) {
    return Rect.fromLTWH(0, 0, mediaSize.width, mediaSize.height);
  }
  @override
  bool shouldReclip(CustomClipper<Rect> oldClipper) {
    return true;
  }
}