🍱 Add app icon
✨ Multiple pages
This commit is contained in:
50
lib/screens/about_page.dart
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50
lib/screens/about_page.dart
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import 'package:flutter/material.dart';
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class AboutPage extends StatelessWidget {
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const AboutPage({super.key});
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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(title: const Text('About')),
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body: Padding(
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padding: const EdgeInsets.all(16.0),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.center,
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children: [
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const SizedBox(height: 20),
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Icon(
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Icons.calculate,
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size: 80,
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color: Theme.of(context).colorScheme.primary,
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),
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const SizedBox(height: 20),
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Text(
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'方程计算器',
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style: Theme.of(context).textTheme.headlineMedium,
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textAlign: TextAlign.center,
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),
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const SizedBox(height: 10),
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Text(
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'Version 1.0.0',
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style: Theme.of(context).textTheme.bodyLarge,
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textAlign: TextAlign.center,
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),
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const SizedBox(height: 20),
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Text(
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'这是一个用于求解方程和表达式的计算器应用。\n\n支持多种类型的数学计算，包括代数方程、表达式求值等。',
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style: Theme.of(context).textTheme.bodyMedium,
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textAlign: TextAlign.center,
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),
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const SizedBox(height: 30),
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Text(
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'© 2025 Simple Math Calculator',
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style: Theme.of(context).textTheme.bodySmall,
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textAlign: TextAlign.center,
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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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195
lib/screens/calculator_home_page.dart
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195
lib/screens/calculator_home_page.dart
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import 'package:flutter/material.dart';
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import 'package:latext/latext.dart';
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import 'package:simple_math_calc/models/calculation_step.dart';
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import 'package:simple_math_calc/solver.dart';
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import 'dart:math';
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class CalculatorHomePage extends StatefulWidget {
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const CalculatorHomePage({super.key});
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@override
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State<CalculatorHomePage> createState() => _CalculatorHomePageState();
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}
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class _CalculatorHomePageState extends State<CalculatorHomePage> {
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final TextEditingController _controller = TextEditingController();
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final SolverService _solverService = SolverService();
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CalculationResult? _result;
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bool _isLoading = false;
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void _solveEquation() {
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if (_controller.text.isEmpty) {
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return;
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}
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setState(() {
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_isLoading = true;
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_result = null; // 清除上次结果
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});
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try {
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// 调用核心服务来解决问题
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final result = _solverService.solve(_controller.text);
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setState(() {
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_result = result;
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});
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} catch (e) {
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// 错误处理
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setState(() {
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_result = CalculationResult(
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steps: [],
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finalAnswer: "错误: ${e.toString()}",
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);
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});
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} finally {
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setState(() {
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_isLoading = false;
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});
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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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title: const Text('方程与表达式计算器'),
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centerTitle: false,
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leading: const Icon(Icons.calculate_outlined),
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),
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body: Column(
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children: [
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Padding(
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padding: const EdgeInsets.only(left: 16.0, right: 16.0, top: 16.0),
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child: Row(
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spacing: 8,
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children: [
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Expanded(
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child: TextField(
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controller: _controller,
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textAlign: TextAlign.center,
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decoration: InputDecoration(
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border: const OutlineInputBorder(),
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labelText: '输入方程或表达式',
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floatingLabelAlignment: FloatingLabelAlignment.center,
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hintText: '例如: 2x^2 - 8x + 6 = 0',
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),
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onSubmitted: (_) => _solveEquation(),
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),
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),
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IconButton(
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onPressed: _solveEquation,
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icon: Icon(Icons.play_arrow),
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),
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],
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),
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),
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Expanded(
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child: _isLoading
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? const Center(child: CircularProgressIndicator())
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: _result == null
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? const Center(child: Text('请输入方程开始计算'))
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: buildResultView(_result!),
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),
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],
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),
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);
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}
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// 构建结果展示视图
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Widget buildResultView(CalculationResult result) {
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return ListView(
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padding: EdgeInsets.only(
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left: 16,
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right: 16,
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bottom: MediaQuery.of(context).padding.bottom + 16,
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top: 16,
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),
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children: [
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...result.steps.map(
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(step) => Card(
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margin: const EdgeInsets.symmetric(vertical: 8),
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child: ClipRRect(
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borderRadius: const BorderRadius.all(Radius.circular(8)),
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child: Stack(
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children: [
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Padding(
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padding: const EdgeInsets.only(
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left: 12,
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right: 12,
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bottom: 4,
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top: 16,
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.center,
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children: [
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Text(
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step.title,
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style: Theme.of(context).textTheme.titleMedium,
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),
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const SizedBox(height: 4),
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SelectableText(step.explanation),
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Center(
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child: LaTexT(
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laTeXCode: Text(
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step.formula,
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style: Theme.of(context).textTheme.titleMedium,
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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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Positioned(
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left: -8,
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top: -8,
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child: Transform.rotate(
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angle: pi / -5,
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child: Opacity(
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opacity: 0.8,
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child: Badge(
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backgroundColor: Theme.of(
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context,
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).colorScheme.primary,
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label: Text(
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step.stepNumber.toString(),
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style: TextStyle(fontSize: 32),
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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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),
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),
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const SizedBox(height: 10),
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Card(
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color: Theme.of(context).colorScheme.primaryContainer,
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
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child: Column(
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children: [
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const SizedBox(height: 16),
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Text(
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"最终答案",
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style: Theme.of(context).textTheme.titleLarge?.copyWith(
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color: Theme.of(context).colorScheme.onPrimaryContainer,
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),
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),
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LaTexT(
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laTeXCode: Text(
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result.finalAnswer,
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style: Theme.of(context).textTheme.titleMedium?.copyWith(
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color: Theme.of(context).colorScheme.onPrimaryContainer,
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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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);
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}
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}
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43
lib/screens/home_screen.dart
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43
lib/screens/home_screen.dart
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@@ -0,0 +1,43 @@
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import 'package:flutter/material.dart';
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import 'calculator_home_page.dart';
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import 'about_page.dart';
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class HomeScreen extends StatefulWidget {
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const HomeScreen({super.key});
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@override
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State<HomeScreen> createState() => _HomeScreenState();
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}
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class _HomeScreenState extends State<HomeScreen> {
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int _selectedIndex = 0;
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static const List<Widget> _widgetOptions = <Widget>[
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CalculatorHomePage(),
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AboutPage(),
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];
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void _onItemTapped(int index) {
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setState(() {
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_selectedIndex = index;
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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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body: _widgetOptions.elementAt(_selectedIndex),
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bottomNavigationBar: BottomNavigationBar(
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items: const <BottomNavigationBarItem>[
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BottomNavigationBarItem(
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icon: Icon(Icons.calculate),
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label: 'Calculator',
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),
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BottomNavigationBarItem(icon: Icon(Icons.info), label: 'About'),
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],
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currentIndex: _selectedIndex,
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onTap: _onItemTapped,
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),
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);
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}
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}
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