OnBoardingPage.dart

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:introduction_screen/introduction_screen.dart';


class OnBoardingPage extends StatefulWidget {
  @override
  _OnBoardingPageState createState() => _OnBoardingPageState();
}

class _OnBoardingPageState extends State<OnBoardingPage> {
  final introKey = GlobalKey<IntroductionScreenState>();

  void _onIntroEnd(context) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => const DrawerHome(),
      ),
    );
    /*Navigator.of(context).push(
      MaterialPageRoute(builder: (_) => HomePage()),
    );*/
  }

  Widget _buildFullscreenImage() {
    return Image.asset(
      'assets/rafiki_01search.jpg',
      fit: BoxFit.cover,
      height: double.infinity,
      width: double.infinity,
      alignment: Alignment.center,
    );
  }

  Widget _buildImage(String assetName, [double width = 350]) {
    return Image.asset('assets/pics/$assetName', width: width);
  }

  @override
  Widget build(BuildContext context) {
    const bodyStyle = TextStyle(fontSize: 19.0);

    const pageDecoration = PageDecoration(
      titleTextStyle: TextStyle(fontSize: 28.0, fontWeight: FontWeight.w700),
      bodyTextStyle: bodyStyle,
      bodyPadding: EdgeInsets.fromLTRB(16.0, 0.0, 16.0, 16.0),
      pageColor: Colors.white,
      imagePadding: EdgeInsets.zero,
    );

    return IntroductionScreen(
      key: introKey,
      globalBackgroundColor: Colors.white,
      globalHeader: Align(
        alignment: Alignment.topRight,
        child: SafeArea(
          child: Padding(
            padding: const EdgeInsets.only(top: 16, right: 16),
            child: _buildImage('flutter.png', 100),
          ),
        ),
      ),
      /*globalFooter: SizedBox(
        width: double.infinity,
        height: 60,
        child: ElevatedButton(
          child: const Text(
            'Let\'s go right away!',
            style: TextStyle(fontSize: 16.0, fontWeight: FontWeight.bold),
          ),
          onPressed: () => _onIntroEnd(context),
        ),
      ),*/
      pages: [
        PageViewModel(
          title: "Fractional shares",
          body:
              "Instead of having to buy an entire share, invest any amount you want.",
          image: _buildImage('rafiki_01search.png'),
          decoration: pageDecoration,
        ),
        PageViewModel(
          title: "Learn as you go",
          body:
              "Download the Stockpile app and master the market with our mini-lesson.",
          image: _buildImage('rafiki_02park.png'),
          decoration: pageDecoration,
        ),
        PageViewModel(
          title: "Kids and teens",
          body:
              "Kids and teens can track their stocks 24/7 and place trades that you approve.",
          image: _buildImage('rafiki_03start.png'),
          decoration: pageDecoration,
        ),
        PageViewModel(
          title: "Full Screen Page",
          body:
              "Pages can be full screen as well.\n\nLorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc id euismod lectus, non tempor felis. Nam rutrum rhoncus est ac venenatis.",
          image: _buildFullscreenImage(),
          decoration: pageDecoration.copyWith(
            contentMargin: const EdgeInsets.symmetric(horizontal: 16),
            fullScreen: true,
            bodyFlex: 2,
            imageFlex: 3,
          ),
        ),
        PageViewModel(
          title: "Another title page",
          body: "Another beautiful body text for this example onboarding",
          image: _buildImage('img2.jpg'),
          footer: ElevatedButton(
            onPressed: () {
              introKey.currentState?.animateScroll(0);
            },
            child: const Text(
              'FooButton',
              style: TextStyle(color: Colors.white),
            ),
            style: ElevatedButton.styleFrom(
              primary: green,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(8.0),
              ),
            ),
          ),
          decoration: pageDecoration,
        ),
        PageViewModel(
          title: "Title of last page - reversed",
          bodyWidget: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: const [
              Text("Click on ", style: bodyStyle),
              Icon(Icons.edit),
              Text(" to edit a post", style: bodyStyle),
            ],
          ),
          decoration: pageDecoration.copyWith(
            bodyFlex: 2,
            imageFlex: 4,
            bodyAlignment: Alignment.bottomCenter,
            imageAlignment: Alignment.topCenter,
          ),
          image: _buildImage('img1.jpg'),
          reverse: true,
        ),
      ],
      onDone: () => _onIntroEnd(context),
      //onSkip: () => _onIntroEnd(context), // You can override onSkip callback
      showSkipButton: false,
      skipOrBackFlex: 0,
      nextFlex: 0,
      showBackButton: true,
      //rtl: true, // Display as right-to-left
      back: const Icon(
        Icons.chevron_left_rounded,
        color: active,
      ),
      skip: const Text(
        'Skip',
        style: TextStyle(fontWeight: FontWeight.w600, color: active),
      ),
      next: const Icon(
        Icons.chevron_right_rounded,
        color: active,
      ),
      done: const Text(
        'Fertig',
        style: TextStyle(fontWeight: FontWeight.w600, color: active),
      ),
      curve: Curves.fastLinearToSlowEaseIn,
      controlsMargin: const EdgeInsets.all(20),
      controlsPadding: kIsWeb
          ? const EdgeInsets.all(12.0)
          : const EdgeInsets.fromLTRB(8.0, 4.0, 8.0, 4.0),
      dotsDecorator: const DotsDecorator(
        size: Size(10.0, 10.0),
        color: grey200,
        activeSize: Size(22.0, 10.0),
        activeColor: active,
        activeShape: RoundedRectangleBorder(
          borderRadius: BorderRadius.all(Radius.circular(25.0)),
        ),
      ),
      dotsContainerDecorator: ShapeDecoration(
        color: white, //Colors.black87,
        shape: const RoundedRectangleBorder(
          borderRadius: BorderRadius.all(
            Radius.circular(20),
          ),
        ),
        shadows: <BoxShadow>[
          BoxShadow(
            color: black.withOpacity(0.15),
            blurRadius: 20,
          ),
        ],
      ),
    );
  }
}