118 lines
2.6 KiB
Dart
118 lines
2.6 KiB
Dart
import 'package:flutter/material.dart';
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void main() {
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runApp(const MyApp());
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}
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class MyApp extends StatelessWidget {
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const MyApp({super.key});
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter Demo',
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theme: ThemeData(
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colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
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useMaterial3: true,
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),
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home: const MyHomePage(),
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);
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}
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}
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///
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/// Shape Builder
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///
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abstract class ShapeBuilder {
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Widget build(Size size, Widget child) {
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return Container(
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height: size.height,
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width: size.width,
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decoration: BoxDecoration(shape: boxShape, color: shapeColor),
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child: Center(child: child),
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);
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}
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BoxShape get boxShape;
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Color get shapeColor;
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}
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class RedSquareBuilder extends ShapeBuilder {
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@override
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BoxShape get boxShape => BoxShape.rectangle;
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@override
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Color get shapeColor => Colors.red;
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}
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class BlueCircleBuilder extends ShapeBuilder {
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@override
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BoxShape get boxShape => BoxShape.circle;
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@override
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Color get shapeColor => Colors.blue;
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}
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///
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/// Message Builder (Writer seemed appropriate)
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///
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abstract class MessageWriter {
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Text write(String text);
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}
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class HotMessageWriter extends MessageWriter {
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@override
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Text write(String text) => Text(text, style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 18));
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}
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class ColdMessageWriter extends MessageWriter {
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@override
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Text write(String text) => Text(text, style: const TextStyle(color: Colors.white, fontSize: 14));
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}
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final List<ShapeBuilder> builders = [
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RedSquareBuilder(),
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BlueCircleBuilder(),
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RedSquareBuilder(),
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];
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final List<MessageWriter> writers = [
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ColdMessageWriter(),
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HotMessageWriter(),
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HotMessageWriter(),
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];
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class MyHomePage extends StatefulWidget {
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const MyHomePage({super.key});
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@override
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State<MyHomePage> createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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backgroundColor: Theme.of(context).colorScheme.inversePrimary,
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title: const Text('Builders'),
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),
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body: Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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const Text('Builders!!'),
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...List.generate(
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3,
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(index) => builders[index].build(
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Size(80.0 * (index + 1), 90.0 * (index + 1)),
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writers[index].write('build ${index + 1}'),
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),
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),
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],
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),
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),
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);
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}
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}
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