transparent-appbar-in-flutter.dart

// Free Flutter Course 💙 https://linktr.ee/vandadnp
// Want to support my work 🤝? https://buymeacoffee.com/vandad

const images = [
  'https://bit.ly/3x7J5Qt',
  'https://bit.ly/3ywI8l6',
  'https://bit.ly/36fNNj9',
  'https://bit.ly/3jOueGG',
  'https://bit.ly/3qYOtDm',
  'https://bit.ly/3wt11Ec',
  'https://bit.ly/3yvFg7X',
  'https://bit.ly/3ywzOla',
  'https://bit.ly/3wnASpW',
  'https://bit.ly/3jXSDto',
];

class HomePage extends StatelessWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      extendBodyBehindAppBar: true,
      appBar: AppBar(
        elevation: 0.0,
        backgroundColor: Colors.blueAccent.withAlpha(200),
        title: const Text('Transparent App Bar in Flutter'),
      ),
      body: const ImagesScrollView(),
    );
  }
}

class ImagesScrollView extends StatelessWidget {
  const ImagesScrollView({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      padding: const EdgeInsets.only(top: 80.0),
      child: Padding(
        padding: const EdgeInsets.only(
          top: 40.0,
          left: 10.0,
          right: 10.0,
        ),
        child: Column(
          children: images
              .map((url) => ElevatedNetworkImage(url: url))
              .expand(
                (img) => [
                  img,
                  const SizedBox(height: 30.0),
                ],
              )
              .toList(),
        ),
      ),
    );
  }
}

class ElevatedNetworkImage extends StatelessWidget {
  final String url;
  const ElevatedNetworkImage({Key? key, required this.url}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return PhysicalShape(
      color: Colors.white,
      clipper: Clipper(),
      elevation: 20.0,
      clipBehavior: Clip.none,
      shadowColor: Colors.white.withAlpha(200),
      child: CutEdges(
        child: Image.network(url),
      ),
    );
  }
}

class Clipper extends CustomClipper<Path> {
  static const variance = 0.2;
  static const reverse = 1.0 - variance;

  @override
  Path getClip(Size size) {
    final path = Path();

    path.moveTo(0.0, size.height * Clipper.variance);
    path.lineTo(size.width * Clipper.variance, 0.0);
    path.lineTo(size.width, 0.0);
    path.lineTo(size.width, size.height * Clipper.reverse);
    path.lineTo(size.width * Clipper.reverse, size.height);
    path.lineTo(0.0, size.height);
    path.lineTo(0.0, size.height * Clipper.variance);
    path.close();
    return path;
  }

  @override
  bool shouldReclip(covariant CustomClipper<Path> oldClipper) => false;
}

class CutEdges extends StatelessWidget {
  final Widget child;

  const CutEdges({Key? key, required this.child}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return ClipPath(
      clipper: Clipper(),
      child: child,
    );
  }
}