Complete Example

Let's add two more components, CustomCard and CustomTextField, with different use cases for manual and generator approaches.

Folder structure#

lib/
├── components/
│ ├── container.dart
│ ├── custom_card.dart
│ └── custom_text_field.dart
├── widgetbook_generator.dart (for generator approach)
├── widgetbook_generator.g.dart (will be generated eventually)
└── widgetbook.dart (for manual approach)

Component#

Let's create both components

CustomCard Component#

Create a file named custom_card.dart in the lib/components directory and add the following code:

// lib/components/custom_card.dart
import 'package:flutter/material.dart';

class CustomCard extends StatelessWidget {
  final Widget child;
  final Color backgroundColor;
  final double borderRadius;

  const CustomCard({
    Key? key,
    required this.child,
    this.backgroundColor = Colors.white,
    this.borderRadius = 8.0,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Card(
      color: backgroundColor,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(borderRadius),
      ),
      child: child,
    );
  }
}

CustomTextField Component#

Create a file named custom_text_field.dart in the lib/components directory and add the following code:

// lib/components/custom_text_field.dart
import 'package:flutter/material.dart';

class CustomTextField extends StatelessWidget {
  final TextEditingController controller;
  final String hintText;

  const CustomTextField({
    Key? key,
    required this.controller,
    this.hintText = '',
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: controller,
      decoration: InputDecoration(
        hintText: hintText,
        border: const OutlineInputBorder(),
      ),
    );
  }
}

Add components#

Update the lib/widgetbook.dart file to add the new components and their use-cases:

Update the lib/components/custom_card.dart and lib/components/custom_text_field.dart files to add the @UseCase annotation for the new components:

// lib/components/custom_card.dart

import 'package:widgetbook_annotation/widgetbook_annotation.dart' as widgetbook;

/// ... [Rest of the code]

@widgetbook.UseCase(
  name: 'Default Style',
  type: CustomCard,
)
CustomCard defaultCustomCard(BuildContext context) {
  return const CustomCard(
    child: Text('This is a custom card'),
  );
}

@widgetbook.UseCase(
  name: 'With Custom Background Color',
  type: CustomCard,
)
CustomCard customBackgroundCustomCard(BuildContext context) {
  return CustomCard(
    backgroundColor: Colors.green.shade100,
    child: const Text('This is a custom card with a custom background color'),
  );
}

// lib/components/custom_text_field.dart
import 'package:widgetbook_annotation/widgetbook_annotation.dart' as widgetbook;

/// ... [Rest of the code]

@widgetbook.UseCase(
  name: 'Default Style',
  type: CustomTextField,
)
CustomTextField defaultCustomTextField(BuildContext context) {
  return CustomTextField(
    controller: TextEditingController(),
  );
}

@widgetbook.UseCase(
  name: 'With Hint Text',
  type: CustomTextField,
)
CustomTextField hintTextCustomTextField(BuildContext context) {
  return CustomTextField(
    controller: TextEditingController(),
    hintText: 'Enter your text here',
  );
}

Then update widgetbook_generator.dart to include @App annotation:

import 'package:flutter/material.dart';
import 'package:widgetbook/widgetbook.dart';
import 'package:widgetbook_annotation/widgetbook_annotation.dart' as widgetbook;

// import generated directories
import 'widgetbook_generator.g.dart';

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

// use @App annotation
@widgetbook.App()
class WidgetbookApp extends StatelessWidget {
  const WidgetbookApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Widgetbook.material(
      // Use the generated directories variable
      directories: directories,
      addons: [],
    );
  }
}

run flutter pub run build_runner build;
run flutter run -d chrome -t lib/widgetbook_generator.dart

Add both component to your directories under WidgetbookFolder names Widgets;

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

import 'components/container.dart';
import 'components/custom_card.dart';
import 'components/custom_text_field.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return Widgetbook.material(
      addons: [],
      directories: [
        WidgetbookFolder(
          name: 'Widgets',
          children: [
            WidgetbookComponent(
              name: 'CustomContainer',
              useCases: [
                WidgetbookUseCase(
                  name: 'Default Style',
                  builder: (context) => greenContainerUseCase(context),
                ),
              ],
            ),
            WidgetbookComponent(
              name: 'CustomCard',
              useCases: [
                WidgetbookUseCase(
                  name: 'Default Style',
                  builder: (context) => const CustomCard(
                    child: Text('This is a custom card'),
                  ),
                ),
                WidgetbookUseCase(
                  name: 'With Custom Background Color',
                  builder: (context) => CustomCard(
                    backgroundColor: Colors.green.shade100,
                    child: const Text(
                      'This is a custom card with a custom background color',
                    ),
                  ),
                ),
              ],
            ),
            // CustomTextField component use-cases
            WidgetbookComponent(
              name: 'CustomTextField',
              useCases: [
                WidgetbookUseCase(
                  name: 'Default Style',
                  builder: (context) => CustomTextField(
                    controller: TextEditingController(),
                  ),
                ),
                WidgetbookUseCase(
                  name: 'With Hint Text',
                  builder: (context) => CustomTextField(
                    controller: TextEditingController(),
                    hintText: 'Enter your text here',
                  ),
                ),
              ],
            ),
          ],
        ),
      ],
    );
  }
}

run flutter run -d chrome -t lib/widgetbook.dart

See source code