Hero Animation Create beautiful transitions between screens the with the Hero widget

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Task: Image Assets

Grab the image assets from the full source code and copy them into the assets folder in your project. Update the pubspec.yaml file to include the image assets.

file_type_flutter pubspec.yaml
flutter:

  uses-material-design: true
  assets:
    - assets/
    - assets/covers/
    - assets/congrats.gif

Topic Card

Create a file called topic_item.dart in the topics folder. Create a card to represent an individual topic.

file_type_dartlang topics_item.dart
import 'package:flutter/material.dart';
import 'package:quizapp/services/models.dart';
import 'package:quizapp/shared/progress_bar.dart';

class TopicItem extends StatelessWidget {
  final Topic topic;
  const TopicItem({ Key? key, required this.topic}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Hero(
      tag: topic.img,
      child: Card(
        clipBehavior: Clip.antiAlias,
        child: InkWell(
          onTap: () {
            Navigator.of(context).push(
              MaterialPageRoute(
                builder: (BuildContext context) => TopicScreen(topic: topic),
              ),
            );
          },
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Flexible(
                flex: 3,
                child: SizedBox(
                  child: Image.asset(
                    'assets/covers/${topic.img}',
                    fit: BoxFit.contain,
                  ),
                ),
              ),
              Flexible(
                child: Padding(
                  padding: const EdgeInsets.only(left: 10, right: 10),
                  child: Text(
                    topic.title,
                    style: const TextStyle(
                      height: 1.5,
                      fontWeight: FontWeight.bold,
                    ),
                    overflow: TextOverflow.fade,
                    softWrap: false,
                  ),
                ),
              ),
              Flexible(child: TopicProgress(topic: topic)),
            ],
          ),
        ),
      ),
    );
  }
}

Individual Topic Screen

When tapped, the card to navigate to the topic screen and keep the image in the view thanks to the Hero widget.

file_type_dartlang topics_item.dart
class TopicScreen extends StatelessWidget {
  final Topic topic;

  const TopicScreen({Key? key,required this.topic}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.transparent,
      ),
      body: ListView(children: [
        Hero(
          tag: topic.img,
          child: Image.asset('assets/covers/${topic.img}',
              width: MediaQuery.of(context).size.width),
        ),
        Text(
          topic.title,
          style:
              const TextStyle(height: 2, fontSize: 20, fontWeight: FontWeight.bold),
        ),
      ]),
    );
  }
}

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