394 lines
13 KiB
Dart
394 lines
13 KiB
Dart
import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:google_fonts/google_fonts.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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late final FocusNode _focusNode;
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CalculationResult? _result;
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bool _isLoading = false;
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bool _isInputFocused = false;
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@override
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void initState() {
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super.initState();
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_focusNode = FocusNode();
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_focusNode.addListener(() {
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setState(() {
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_isInputFocused = _focusNode.hasFocus;
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});
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});
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}
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@override
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void dispose() {
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_focusNode.dispose();
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super.dispose();
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}
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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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void _insertSymbol(String symbol) {
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final text = _controller.text;
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final selection = _controller.selection;
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final newText = text.replaceRange(selection.start, selection.end, symbol);
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_controller.text = newText;
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_controller.selection = TextSelection.collapsed(
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offset: selection.start + symbol.length,
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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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focusNode: _focusNode,
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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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keyboardType: kIsWeb
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? TextInputType.numberWithOptions(
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signed: true,
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decimal: true,
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)
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: TextInputType.number,
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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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if (_isInputFocused) _buildToolbar(),
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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: 16,
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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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if (!step.explanation.contains(r'$'))
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SelectableText(
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step.explanation,
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textAlign: TextAlign.center,
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)
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else
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LaTexT(
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laTeXCode: Text(
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step.explanation,
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textAlign: TextAlign.center,
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),
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),
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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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textColor: Theme.of(context).colorScheme.onPrimary,
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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: 24),
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child: Column(
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children: [
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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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Widget _buildToolbar() {
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return Material(
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elevation: 8,
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 8.0, vertical: 8),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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spacing: 8,
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children: [
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Expanded(
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child: Tooltip(
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message: '左括号',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('('),
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child: Text('(', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '右括号',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol(')'),
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child: Text(')', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '幂符号',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('^'),
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child: Text('^', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '平方',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('^2'),
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child: Text('²', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '未知数',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('x'),
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child: Text('x', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '未知数二号',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('y'),
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child: Text('y', style: GoogleFonts.robotoMono()),
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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: 8),
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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spacing: 8,
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children: [
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Expanded(
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child: Tooltip(
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message: '加法',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('+'),
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child: Text('+', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '减法',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('-'),
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child: Text('-', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '乘法',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('*'),
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child: Text('*', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '除法',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('/'),
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child: Text('/', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '小数点',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('.'),
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child: Text('.', style: GoogleFonts.robotoMono()),
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),
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),
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),
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Expanded(
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child: Tooltip(
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message: '等于号',
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child: FilledButton.tonal(
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onPressed: () => _insertSymbol('='),
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child: Text('=', style: GoogleFonts.robotoMono()),
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),
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),
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),
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],
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),
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if (!kIsWeb) const SizedBox(height: 8),
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if (!kIsWeb)
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Row(
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children: [
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Expanded(
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child: FilledButton.icon(
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icon: const Icon(Icons.keyboard_hide),
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onPressed: () => _focusNode.unfocus(),
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label: Text('收起键盘'),
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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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