88 lines
2.1 KiB
Dart
88 lines
2.1 KiB
Dart
import 'dart:math';
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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: 'My Test App',
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debugShowCheckedModeBanner: false,
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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(title: 'My Test App'),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({super.key, required this.title});
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final String title;
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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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int _counter = 0;
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Color _color = Colors.orangeAccent;
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Color _fcolor = Colors.black;
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void _incrementCounter() {
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setState(() {
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_counter++;
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_color = Color((Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(1);
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_fcolor =
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(_color.computeLuminance() <= 0.3) ? Colors.white : Colors.black;
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});
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}
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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: _color,
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foregroundColor: _fcolor,
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title: Text(widget.title),
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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(
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'You have pushed the button this many times:',
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),
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Text(
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'$_counter',
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style: Theme.of(context).textTheme.headlineMedium,
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),
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Visibility(
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visible: _counter > 10,
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child: Text(
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'Why are you clicking?',
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style: Theme.of(context).textTheme.headlineMedium,
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),
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)
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],
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),
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),
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floatingActionButton: FloatingActionButton(
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backgroundColor: _color,
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foregroundColor: _fcolor,
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onPressed: _incrementCounter,
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tooltip: 'Increment',
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child: const Icon(Icons.add),
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),
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);
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}
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}
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