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rich_text.dart
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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'package:flutter/material.dart';
import 'diagram_step.dart';
class RichTextDiagram extends StatelessWidget with DiagramMetadata {
const RichTextDiagram(this.name, {super.key});
@override
final String name;
@override
Widget build(BuildContext context) {
return ConstrainedBox(
key: UniqueKey(),
constraints: BoxConstraints.tight(const Size(240.0, 140.0)),
child: Container(
alignment: FractionalOffset.center,
padding: const EdgeInsets.all(5.0),
color: Colors.white,
child: RichText(
text: TextSpan(
text: 'Hello ',
style: DefaultTextStyle.of(context).style,
children: const <TextSpan>[
TextSpan(
text: 'bold',
style: TextStyle(fontWeight: FontWeight.bold),
),
TextSpan(text: ' world!'),
],
),
),
),
);
}
}
class RichTextDiagramStep extends DiagramStep {
@override
final String category = 'widgets';
@override
Future<List<RichTextDiagram>> get diagrams async => <RichTextDiagram>[
const RichTextDiagram('rich_text'),
];
}