Page Turn Effect - By Simon Lightfoot. Replicating this behaviour. https://www.youtube.com/watch?v=JqvtZwIJMLo

page_turn.dart

// MIT License
//
// Copyright (c) 2019 Simon Lightfoot
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
import 'dart:math' as math;
import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primaryColor: Colors.indigo,
        accentColor: Colors.pinkAccent,
      ),
      home: ExampleScreen(),
    ),
  );
}

class ExampleScreen extends StatefulWidget {
  @override
  _ExampleScreenState createState() => _ExampleScreenState();
}

class _ExampleScreenState extends State<ExampleScreen> with SingleTickerProviderStateMixin {
  AnimationController _controller;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      value: 0.5,
      duration: const Duration(milliseconds: 450),
      vsync: this,
    );
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  void _onTap() {
    if (_controller.status == AnimationStatus.dismissed || _controller.status == AnimationStatus.reverse) {
      _controller.forward();
    } else {
      _controller.reverse();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Material(
      child: GestureDetector(
        behavior: HitTestBehavior.opaque,
        onTap: _onTap,
        child: Stack(
          fit: StackFit.expand,
          children: <Widget>[
            PageTurnImage(
              amount: AlwaysStoppedAnimation(1.0),
              image: NetworkImage(
                  'https://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/John_Masefield.djvu/page10-1024px-John_Masefield.djvu.jpg'),
            ),
            PageTurnWidget(
              amount: _controller,
              child: AlicePage1(),
            ),
            Positioned(
              left: 0.0,
              right: 0.0,
              bottom: 0.0,
              height: 48.0,
              child: AnimatedBuilder(
                animation: _controller,
                builder: (BuildContext context, Widget child) {
                  return Slider(
                    value: _controller.value,
                    onChanged: (double value) {
                      _controller.value = value;
                    },
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class AlicePage1 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return DefaultTextStyle.merge(
      style: TextStyle(fontSize: 16.0),
      child: SafeArea(
        child: Padding(
          padding: const EdgeInsets.symmetric(vertical: 16.0, horizontal: 24.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              Text(
                "CHAPTER I",
                style: TextStyle(
                  fontSize: 32.0,
                  fontWeight: FontWeight.bold,
                ),
                textAlign: TextAlign.center,
              ),
              Text(
                "Down the Rabbit-Hole",
                style: TextStyle(
                  fontSize: 24.0,
                  fontWeight: FontWeight.w500,
                ),
                textAlign: TextAlign.center,
              ),
              const SizedBox(height: 32.0),
              Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  Expanded(
                    child: Text("Alice was beginning to get very tired of sitting by her sister on the bank, and of"
                        " having nothing to do: once or twice she had peeped into the book her sister was "
                        "reading, but it had no pictures or conversations in it, `and what is the use of "
                        "a book,' thought Alice `without pictures or conversation?'"),
                  ),
                  Container(
                    margin: const EdgeInsets.only(left: 12.0),
                    color: Colors.black26,
                    width: 160.0,
                    height: 220.0,
                    child: Placeholder(),
                  ),
                ],
              ),
              const SizedBox(height: 16.0),
              Text(
                "So she was considering in her own mind (as well as she could, for the hot day made her "
                "feel very sleepy and stupid), whether the pleasure of making a daisy-chain would be "
                "worth the trouble of getting up and picking the daisies, when suddenly a White "
                "Rabbit with pink eyes ran close by her.\n"
                "\n"
                "There was nothing so very remarkable in that; nor did Alice think it so very much out "
                "of the way to hear the Rabbit say to itself, `Oh dear! Oh dear! I shall be "
                "late!' (when she thought it over afterwards, it occurred to her that she ought to "
                "have wondered at this, but at the time it all seemed quite natural); but when the "
                "Rabbit actually took a watch out of its waistcoat-pocket, and looked at it, and then "
                "hurried on, Alice started to her feet, for it flashed across her mind that she had "
                "never before seen a rabbit with either a waistcoat-pocket, or a watch to take out "
                "of it, and burning with curiosity, she ran across the field after it, and fortunately "
                "was just in time to see it pop down a large rabbit-hole under the hedge.",
              ),
            ],
          ),
        ),
      ),
    );
  }
}

// -----------------

class PageTurnWidget extends StatefulWidget {
  const PageTurnWidget({
    Key key,
    this.amount,
    this.backgroundColor = const Color(0xFFFFFFCC),
    this.child,
  }) : super(key: key);

  final Animation<double> amount;
  final Color backgroundColor;
  final Widget child;

  @override
  _PageTurnWidgetState createState() => _PageTurnWidgetState();
}

class _PageTurnWidgetState extends State<PageTurnWidget> {
  final _boundaryKey = GlobalKey();
  ui.Image _image;

  @override
  void didUpdateWidget(PageTurnWidget oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.child != widget.child) {
      _image = null;
    }
  }

  void _captureImage(Duration timeStamp) async {
    final pixelRatio = MediaQuery.of(context).devicePixelRatio;
    final boundary = _boundaryKey.currentContext.findRenderObject() as RenderRepaintBoundary;
    final image = await boundary.toImage(pixelRatio: pixelRatio);
    setState(() => _image = image);
  }

  @override
  Widget build(BuildContext context) {
    if (_image != null) {
      return CustomPaint(
        painter: _PageTurnEffect(
          amount: widget.amount,
          image: _image,
          backgroundColor: widget.backgroundColor,
        ),
        size: Size.infinite,
      );
    } else {
      WidgetsBinding.instance.addPostFrameCallback(_captureImage);
      return LayoutBuilder(
        builder: (BuildContext context, BoxConstraints constraints) {
          final size = constraints.biggest;
          return Stack(
            overflow: Overflow.clip,
            children: <Widget>[
              Positioned(
                left: 1 + size.width,
                top: 1 + size.height,
                width: size.width,
                height: size.height,
                child: RepaintBoundary(
                  key: _boundaryKey,
                  child: widget.child,
                ),
              ),
            ],
          );
        },
      );
    }
  }
}

class PageTurnImage extends StatefulWidget {
  const PageTurnImage({
    Key key,
    this.amount,
    this.image,
    this.backgroundColor = const Color(0xFFFFFFCC),
  }) : super(key: key);

  final Animation<double> amount;
  final ImageProvider image;
  final Color backgroundColor;

  @override
  _PageTurnImageState createState() => _PageTurnImageState();
}

class _PageTurnImageState extends State<PageTurnImage> {
  ImageStream _imageStream;
  ImageInfo _imageInfo;
  bool _isListeningToStream = false;

  ImageStreamListener _imageListener;

  @override
  void initState() {
    super.initState();
    _imageListener = ImageStreamListener(_handleImageFrame);
  }

  @override
  void dispose() {
    _stopListeningToStream();
    super.dispose();
  }

  @override
  void didChangeDependencies() {
    _resolveImage();
    if (TickerMode.of(context)) {
      _listenToStream();
    } else {
      _stopListeningToStream();
    }
    super.didChangeDependencies();
  }

  @override
  void didUpdateWidget(PageTurnImage oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (widget.image != oldWidget.image) {
      _resolveImage();
    }
  }

  @override
  void reassemble() {
    _resolveImage(); // in case the image cache was flushed
    super.reassemble();
  }

  void _resolveImage() {
    final ImageStream newStream = widget.image.resolve(createLocalImageConfiguration(context));
    assert(newStream != null);
    _updateSourceStream(newStream);
  }

  void _handleImageFrame(ImageInfo imageInfo, bool synchronousCall) {
    setState(() => _imageInfo = imageInfo);
  }

  // Updates _imageStream to newStream, and moves the stream listener
  // registration from the old stream to the new stream (if a listener was
  // registered).
  void _updateSourceStream(ImageStream newStream) {
    if (_imageStream?.key == newStream?.key) return;

    if (_isListeningToStream) _imageStream.removeListener(_imageListener);

    _imageStream = newStream;
    if (_isListeningToStream) _imageStream.addListener(_imageListener);
  }

  void _listenToStream() {
    if (_isListeningToStream) return;
    _imageStream.addListener(_imageListener);
    _isListeningToStream = true;
  }

  void _stopListeningToStream() {
    if (!_isListeningToStream) return;
    _imageStream.removeListener(_imageListener);
    _isListeningToStream = false;
  }

  @override
  Widget build(BuildContext context) {
    if (_imageInfo != null) {
      return CustomPaint(
        painter: _PageTurnEffect(
          amount: widget.amount,
          image: _imageInfo.image,
          backgroundColor: widget.backgroundColor,
        ),
        size: Size.infinite,
      );
    } else {
      return const SizedBox();
    }
  }
}

class _PageTurnEffect extends CustomPainter {
  _PageTurnEffect({
    @required this.amount,
    @required this.image,
    this.backgroundColor,
    this.radius = 0.18,
  })  : assert(amount != null && image != null && radius != null),
        super(repaint: amount);

  final Animation<double> amount;
  final ui.Image image;
  final Color backgroundColor;
  final double radius;

  @override
  void paint(ui.Canvas canvas, ui.Size size) {
    final pos = amount.value;
    final movX = (1.0 - pos) * 0.85;
    final calcR = (movX < 0.20) ? radius * movX * 5 : radius;
    final wHRatio = 1 - calcR;
    final hWRatio = image.height / image.width;
    final hWCorrection = (hWRatio - 1.0) / 2.0;

    final w = size.width.toDouble();
    final h = size.height.toDouble();
    final c = canvas;
    final shadowXf = (wHRatio - movX);
    final shadowSigma = Shadow.convertRadiusToSigma(8.0 + (32.0 * (1.0 - shadowXf)));
    final pageRect = Rect.fromLTRB(0.0, 0.0, w * shadowXf, h);
    if (backgroundColor != null) {
      c.drawRect(pageRect, Paint()..color = backgroundColor);
    }
    c.drawRect(
      pageRect,
      Paint()
        ..color = Colors.black54
        ..maskFilter = MaskFilter.blur(BlurStyle.outer, shadowSigma),
    );

    final ip = Paint();
    for (double x = 0; x < size.width; x++) {
      final xf = (x / w);
      final v = (calcR * (math.sin(math.pi / 0.5 * (xf - (1.0 - pos)))) + (calcR * 1.1));
      final xv = (xf * wHRatio) - movX;
      final sx = (xf * image.width);
      final sr = Rect.fromLTRB(sx, 0.0, sx + 1.0, image.height.toDouble());
      final yv = ((h * calcR * movX) * hWRatio) - hWCorrection;
      final ds = (yv * v);
      final dr = Rect.fromLTRB(xv * w, 0.0 - ds, xv * w + 1.0, h + ds);
      c.drawImageRect(image, sr, dr, ip);
    }
  }

  @override
  bool shouldRepaint(_PageTurnEffect oldDelegate) {
    return oldDelegate.image != image || oldDelegate.amount.value != amount.value;
  }
}

100% give this a builder and handle each animation controller internally and release this as a package replacement for PageView :)

Hi, I find an issus. Unhandled exception when calling first time RenderRepaintBoundary.toImage()
flutter/flutter#22308
if i fellow this solution. page content will every ugly.

HI, how can I use this effect with PageView?

Could you please upgrade this to null safety?

How to solve the problem of unclear font sawtooth. please help me o(╥﹏╥)o

Upgrade this code to null safety

import 'dart:math' as math;
import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  AnimationController? _controller;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      value: 0.5,
      duration: const Duration(milliseconds: 450),
      vsync: this,
    );
  }

  @override
  void dispose() {
    _controller?.dispose();
    super.dispose();
  }

  void _onTap() {
    if (_controller?.status == AnimationStatus.dismissed ||
        _controller?.status == AnimationStatus.reverse) {
      _controller?.forward();
    } else {
      _controller?.reverse();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: const Text('title'),
      ),
      body: Material(
        child: GestureDetector(
          behavior: HitTestBehavior.opaque,
          onTap: _onTap,
          child: Stack(
            fit: StackFit.expand,
            children: [
              const PageTurnImage(
                amount: AlwaysStoppedAnimation(1.0),
                image: NetworkImage(
                  'https://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/John_Masefield.djvu/page10-1024px-John_Masefield.djvu.jpg',
                ),
              ),
              PageTurnWidget(
                amount: _controller!,
                child: const AlicePage(),
              ),
              Positioned(
                left: 0.0,
                right: 0.0,
                bottom: 0.0,
                height: 48.0,
                child: AnimatedBuilder(
                  animation: _controller!,
                  builder: (context, child) {
                    return Slider(
                      value: _controller!.value,
                      onChanged: (double value) {
                        _controller?.value = value;
                      },
                    );
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return DefaultTextStyle.merge(
      style: const TextStyle(fontSize: 16.0),
      child: SafeArea(
        child: Padding(
          padding: const EdgeInsets.symmetric(vertical: 16.0, horizontal: 24.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              const Text(
                "CHAPTER I",
                style: TextStyle(
                  fontSize: 32.0,
                  fontWeight: FontWeight.bold,
                ),
                textAlign: TextAlign.center,
              ),
              const Text(
                "Down the Rabbit-Hole",
                style: TextStyle(
                  fontSize: 24.0,
                  fontWeight: FontWeight.w500,
                ),
                textAlign: TextAlign.center,
              ),
              const SizedBox(height: 32.0),
              Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  const Expanded(
                    child: Text(
                        "Alice was beginning to get very tired of sitting by her sister on the bank, and of"
                        " having nothing to do: once or twice she had peeped into the book her sister was "
                        "reading, but it had no pictures or conversations in it, `and what is the use of "
                        "a book,' thought Alice `without pictures or conversation?'"),
                  ),
                  Container(
                    margin: const EdgeInsets.only(left: 12.0),
                    color: Colors.black26,
                    width: 160.0,
                    height: 220.0,
                    child: const Placeholder(),
                  ),
                ],
              ),
              const SizedBox(height: 16.0),
              const Text(
                "So she was considering in her own mind (as well as she could, for the hot day made her "
                "feel very sleepy and stupid), whether the pleasure of making a daisy-chain would be "
                "worth the trouble of getting up and picking the daisies, when suddenly a White "
                "Rabbit with pink eyes ran close by her.\n"
                "\n"
                "There was nothing so very remarkable in that; nor did Alice think it so very much out "
                "of the way to hear the Rabbit say to itself, `Oh dear! Oh dear! I shall be "
                "late!' (when she thought it over afterwards, it occurred to her that she ought to "
                "have wondered at this, but at the time it all seemed quite natural); but when the "
                "Rabbit actually took a watch out of its waistcoat-pocket, and looked at it, and then "
                "hurried on, Alice started to her feet, for it flashed across her mind that she had "
                "never before seen a rabbit with either a waistcoat-pocket, or a watch to take out "
                "of it, and burning with curiosity, she ran across the field after it, and fortunately "
                "was just in time to see it pop down a large rabbit-hole under the hedge.",
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class PageTurnWidget extends StatefulWidget {
  const PageTurnWidget({
    Key? key,
    required this.amount,
    this.backgroundColor = const Color(0xFFFFFFCC),
    required this.child,
  }) : super(key: key);

  final Animation<double> amount;
  final Color backgroundColor;
  final Widget child;

  @override
  _PageTurnWidgetState createState() => _PageTurnWidgetState();
}

class _PageTurnWidgetState extends State<PageTurnWidget> {
  final _boundaryKey = GlobalKey();
  ui.Image? _image;

  @override
  void didUpdateWidget(PageTurnWidget oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.child != widget.child) {
      _image = null;
    }
  }

  void _captureImage(Duration timeStamp) async {
    final pixelRatio = MediaQuery.of(context).devicePixelRatio;
    final boundary = _boundaryKey.currentContext?.findRenderObject()
        as RenderRepaintBoundary;
    final image = await boundary.toImage(pixelRatio: pixelRatio);
    setState(() => _image = image);
  }

  @override
  Widget build(BuildContext context) {
    if (_image != null) {
      return CustomPaint(
        painter: _PageTurnEffect(
          amount: widget.amount,
          image: _image!,
          backgroundColor: widget.backgroundColor,
        ),
        size: Size.infinite,
      );
    } else {
      WidgetsBinding.instance?.addPostFrameCallback(_captureImage);
      return LayoutBuilder(
        builder: (BuildContext context, BoxConstraints constraints) {
          final size = constraints.biggest;
          return Stack(
            clipBehavior: Clip.hardEdge,
            children: [
              Positioned(
                left: 1 + size.width,
                top: 1 + size.height,
                width: size.width,
                height: size.height,
                child: RepaintBoundary(
                  key: _boundaryKey,
                  child: widget.child,
                ),
              ),
            ],
          );
        },
      );
    }
  }
}

class PageTurnImage extends StatefulWidget {
  const PageTurnImage({
    Key? key,
    required this.amount,
    required this.image,
    this.backgroundColor = const Color(0xFFFFFFCC),
  }) : super(key: key);

  final Animation<double> amount;
  final ImageProvider image;
  final Color backgroundColor;

  @override
  _PageTurnImageState createState() => _PageTurnImageState();
}

class _PageTurnImageState extends State<PageTurnImage> {
  ImageStream? _imageStream;
  ImageInfo? _imageInfo;
  bool _isListeningToStream = false;

  ImageStreamListener? _imageListener;

  @override
  void initState() {
    super.initState();
    _imageListener = ImageStreamListener(_handleImageFrame);
  }

  @override
  void dispose() {
    _stopListeningToStream();
    super.dispose();
  }

  @override
  void didChangeDependencies() {
    _resolveImage();
    if (TickerMode.of(context)) {
      _listenToStream();
    } else {
      _stopListeningToStream();
    }
    super.didChangeDependencies();
  }

  @override
  void didUpdateWidget(PageTurnImage oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (widget.image != oldWidget.image) {
      _resolveImage();
    }
  }

  @override
  void reassemble() {
    _resolveImage(); // in case the image cache was flushed
    super.reassemble();
  }

  void _resolveImage() {
    final ImageStream newStream =
        widget.image.resolve(createLocalImageConfiguration(context));
    _updateSourceStream(newStream);
  }

  void _handleImageFrame(ImageInfo imageInfo, bool synchronousCall) {
    setState(() => _imageInfo = imageInfo);
  }

  // Updates _imageStream to newStream, and moves the stream listener
  // registration from the old stream to the new stream (if a listener was
  // registered).
  void _updateSourceStream(ImageStream newStream) {
    if (_imageStream?.key == newStream.key) return;

    if (_isListeningToStream) _imageStream?.removeListener(_imageListener!);

    _imageStream = newStream;
    if (_isListeningToStream) _imageStream?.addListener(_imageListener!);
  }

  void _listenToStream() {
    if (_isListeningToStream) return;
    _imageStream?.addListener(_imageListener!);
    _isListeningToStream = true;
  }

  void _stopListeningToStream() {
    if (!_isListeningToStream) return;
    _imageStream?.removeListener(_imageListener!);
    _isListeningToStream = false;
  }

  @override
  Widget build(BuildContext context) {
    if (_imageInfo != null) {
      return CustomPaint(
        painter: _PageTurnEffect(
          amount: widget.amount,
          image: _imageInfo!.image,
          backgroundColor: widget.backgroundColor,
        ),
        size: Size.infinite,
      );
    } else {
      return const SizedBox();
    }
  }
}

class _PageTurnEffect extends CustomPainter {
  final Animation<double> amount;
  final ui.Image image;
  final Color backgroundColor;
  final double radius;

  _PageTurnEffect({
    required this.amount,
    required this.image,
    required this.backgroundColor,
    this.radius = 0.18,
  })  : super(repaint: amount);

  @override
  void paint(ui.Canvas canvas, ui.Size size) {
    final pos = amount.value;
    final movX = (1.0 - pos) * 0.85;
    final calcR = (movX < 0.20) ? radius * movX * 5 : radius;
    final wHRatio = 1 - calcR;
    final hWRatio = image.height / image.width;
    final hWCorrection = (hWRatio - 1.0) / 2.0;

    final w = size.width.toDouble();
    final h = size.height.toDouble();
    final c = canvas;
    final shadowXf = (wHRatio - movX);
    final shadowSigma =
        Shadow.convertRadiusToSigma(8.0 + (32.0 * (1.0 - shadowXf)));
    final pageRect = Rect.fromLTRB(0.0, 0.0, w * shadowXf, h);
    c.drawRect(pageRect, Paint()..color = backgroundColor);
    c.drawRect(
      pageRect,
      Paint()
        ..color = Colors.black54
        ..maskFilter = MaskFilter.blur(BlurStyle.outer, shadowSigma),
    );

    final ip = Paint();
    for (double x = 0; x < size.width; x++) {
      final xf = (x / w);
      final v = (calcR * (math.sin(math.pi / 0.5 * (xf - (1.0 - pos)))) +
          (calcR * 1.1));
      final xv = (xf * wHRatio) - movX;
      final sx = (xf * image.width);
      final sr = Rect.fromLTRB(sx, 0.0, sx + 1.0, image.height.toDouble());
      final yv = ((h * calcR * movX) * hWRatio) - hWCorrection;
      final ds = (yv * v);
      final dr = Rect.fromLTRB(xv * w, 0.0 - ds, xv * w + 1.0, h + ds);
      c.drawImageRect(image, sr, dr, ip);
    }
  }

  @override
  bool shouldRepaint(_PageTurnEffect oldDelegate) {
    return oldDelegate.image != image ||
        oldDelegate.amount.value != amount.value;
  }
}

This null-safety code works on large screens only and if the screen is a bit small the whole app falls apart and shows overflow and does not work. if you could also curl the page with finger touch instead of that bottom bar it would be waaaay more better. thank you.

can anyone make it to work with "TranstionBuilder"?

Can I implement this animation in pdf view?

is there any way to implement it in pdf view?

I have been looking for the pdf view as well.

@slightfoot ListView is not working in a child as GestureDetector will avoid the scrolling. any solution for this?