Blog: Enrich the Flutter Inspector with Diagnosticable properties

diagnosticable_properties_complete_code.dart

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark(),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late MyColorScheme _myColorScheme;
  int _counter = 0;

  @override
  void initState() {
    _myColorScheme = MyColorScheme(Colors.black, Colors.white);
    super.initState();
  }

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(IntProperty('_counter', _counter));
    properties.add(
        DiagnosticsProperty<MyColorScheme>('myColorScheme', _myColorScheme));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

class MyColorScheme with Diagnosticable {
  final Color textColor;
  final Color backgroundColor;

  MyColorScheme(this.textColor, this.backgroundColor);

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(ColorProperty('textColor', textColor));
    properties.add(ColorProperty('backgroundColor', backgroundColor));
  }
}