68 lines
1.4 KiB
Dart
68 lines
1.4 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.cyan),
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useMaterial3: true,
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),
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home: const MyHomePage(title: 'Flutter Demo Home Page'),
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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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String _expression = "";
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String _result = "";
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void _setExpression(String expression) {
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setState(() {
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_expression = expression;
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_result = expression;
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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: Theme.of(context).colorScheme.inversePrimary,
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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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children: <Widget>[
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TextField(
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onChanged: (text) {
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_setExpression(text);
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},
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),
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Text(
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_result,
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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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}
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}
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