351 lines
9.4 KiB
Dart
351 lines
9.4 KiB
Dart
import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'dart:ui' as ui;
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import 'package:flutter/services.dart';
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import 'package:path_provider/path_provider.dart';
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class MineSignPage extends StatelessWidget {
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const MineSignPage({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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body: const SignatureConfirmPage(),
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);
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}
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}
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class SignatureConfirmPage extends StatefulWidget {
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const SignatureConfirmPage({super.key});
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@override
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State<SignatureConfirmPage> createState() => _SignatureConfirmPageState();
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}
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class _SignatureConfirmPageState extends State<SignatureConfirmPage> {
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final GlobalKey _signatureKey = GlobalKey();
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List<Offset?> _points = [];
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bool _hasSignature = false;
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File? fileN;
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Uint8List? _postBytes;
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late String imagepath = "";
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void _clearSignature() {
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setState(() {
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_points.clear();
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_hasSignature = false;
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});
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}
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void _confirmSignature() {
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if (!_hasSignature) {
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ScaffoldMessenger.of(context).showSnackBar(
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const SnackBar(content: Text('请先签名')),
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);
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return;
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}
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_saveSignPic();
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// // 保存签名逻辑
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// ScaffoldMessenger.of(context).showSnackBar(
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// const SnackBar(content: Text('签名已确认')),
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// );
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//模拟保存后返回
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}
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// 保存签名
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void _saveSignPic() async {
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RenderRepaintBoundary boundary = _signatureKey.currentContext!
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.findRenderObject() as RenderRepaintBoundary;
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var image = await boundary.toImage(pixelRatio: 1);
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ByteData? byteData =
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await image.toByteData(format: ui.ImageByteFormat.png);
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int timestamp = DateTime.now().millisecondsSinceEpoch;
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Directory dir = await getTemporaryDirectory();
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// 在文件名中添加时间戳
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String path = '${dir.path}/sign_$timestamp.png';
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File file2 = File(path);
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// 检查文件是否存在
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if (await file2.exists()) {
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await file2.delete();
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}
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var file = await File(path).create(recursive: true);
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if (byteData != null) {
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file.writeAsBytesSync(byteData.buffer.asInt8List(), flush: true);
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setState(() {
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_postBytes = byteData.buffer.asUint8List();
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fileN = file;
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imagepath = file.path;
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Future.delayed(const Duration(milliseconds: 500), () {
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Navigator.pop(context, imagepath);
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});
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});
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}
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}
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@override
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void initState() {
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super.initState();
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SystemChrome.setPreferredOrientations([
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DeviceOrientation.landscapeRight,
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DeviceOrientation.landscapeLeft,
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]);
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}
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@override
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void dispose() {
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// 不要忘记重置方向设置，以避免影响其他页面或应用。
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SystemChrome.setPreferredOrientations([
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DeviceOrientation.portraitUp,
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DeviceOrientation.portraitDown,
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DeviceOrientation.landscapeLeft,
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DeviceOrientation.landscapeRight,
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]);
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super.dispose();
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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: SafeArea(
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child: Column(
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children: [
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// 标题区域
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_buildTitleBar(),
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// MyAppbar(title: "签字"),
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// 签字区域
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Expanded(
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child: _buildSignatureArea(),
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),
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// 按钮区域
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_buildActionButtons(),
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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 _buildTitleBar() {
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return Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [
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IconButton(
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icon: const Icon(Icons.arrow_back),
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onPressed: () => Navigator.pop(context),
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),
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const Text(
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'签字',
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style: TextStyle(
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fontSize: 20,
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(width: 48), // 占位保持标题居中
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],
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),
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);
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}
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Widget _buildSignatureArea() {
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return Padding(
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padding: const EdgeInsets.symmetric(horizontal: 24),
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child: Container(
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(12),
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border: Border.all(color: Colors.grey[300]!),
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),
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child: Column(
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children: [
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// 签字画布
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Expanded(
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child: GestureDetector(
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onPanStart: (details) {
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setState(() {
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_points.add(details.localPosition);
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_hasSignature = true;
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});
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},
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onPanUpdate: (details) {
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setState(() {
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_points.add(details.localPosition);
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});
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},
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onPanEnd: (details) {
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setState(() {
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_points.add(null);
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});
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},
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child: RepaintBoundary(
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key: _signatureKey,
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child: Container(
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// 给画布添加白色背景，不透明导出
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color: Colors.white,
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child: Stack(
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children: [
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// if (imagepath.length > 0)
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// Image.file(
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// File(imagepath), // 显示选择的图片文件
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// fit: BoxFit.contain, // 设置图片填充方式为完整显示，保持宽高比例
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// ),
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// 背景横线
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_buildBackgroundLines(),
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// 签名画布
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CustomPaint(
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painter: SignaturePainter(points: _points),
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size: Size.infinite,
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),
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// 提示文字
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if (!_hasSignature)
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const Center(
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child: Text(
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'请在此处签名',
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style: TextStyle(
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fontSize: 16,
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color: Colors.grey,
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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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),
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);
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}
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Widget _buildBackgroundLines() {
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return LayoutBuilder(
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builder: (context, constraints) {
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return CustomPaint(
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painter: BackgroundLinesPainter(),
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size: Size(constraints.maxWidth, constraints.maxHeight),
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);
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},
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);
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}
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Widget _buildActionButtons() {
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return Padding(
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padding: const EdgeInsets.only(left: 24,right: 24,top: 10,bottom: 10),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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children: [
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// 重签按钮
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Expanded(
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child: OutlinedButton(
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onPressed: _clearSignature,
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style: OutlinedButton.styleFrom(
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padding: const EdgeInsets.symmetric(vertical: 8),
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side: const BorderSide(color: Colors.blue),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(8),
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),
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),
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child: const Text(
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'重签',
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style: TextStyle(
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fontSize: 16,
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color: Colors.blue,
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fontWeight: FontWeight.w500,
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),
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),
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),
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),
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const SizedBox(width: 20),
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// 确定按钮
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Expanded(
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child: ElevatedButton(
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onPressed: _confirmSignature,
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.blue,
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padding: const EdgeInsets.symmetric(vertical: 8),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(8),
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),
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),
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child: const Text(
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'确定',
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style: TextStyle(
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fontSize: 16,
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color: Colors.white,
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fontWeight: FontWeight.w500,
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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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// 签名绘制器
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class SignaturePainter extends CustomPainter {
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final List<Offset?> points;
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SignaturePainter({required this.points});
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@override
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void paint(Canvas canvas, Size size) {
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Paint paint = Paint()
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..color = Colors.black
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..strokeCap = StrokeCap.round
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..strokeWidth = 3.0;
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for (int i = 0; i < points.length - 1; i++) {
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if (points[i] != null && points[i + 1] != null) {
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canvas.drawLine(points[i]!, points[i + 1]!, paint);
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}
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}
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}
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@override
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bool shouldRepaint(SignaturePainter oldDelegate) =>
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oldDelegate.points != points;
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}
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// 背景横线绘制器
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class BackgroundLinesPainter extends CustomPainter {
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@override
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void paint(Canvas canvas, Size size) {
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Paint paint = Paint()
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// ..color = Colors.grey[200]!
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..color = Color.from(alpha: 0, red: 0, green: 0, blue: 0)!
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..strokeWidth = 0;
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// 绘制横线
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for (double y = 40; y < size.height; y += 40) {
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canvas.drawLine(
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Offset(0, y),
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Offset(size.width, y),
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paint,
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);
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}
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}
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@override
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bool shouldRepaint(CustomPainter oldDelegate) => false;
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} |