pdf_export_print 0.1.0 
pdf_export_print: ^0.1.0 copied to clipboard
A powerful and highly customizable Flutter PDF generation library with modular design.
// ignore_for_file: avoid_print
import 'package:flutter/material.dart';
import 'package:printing/printing.dart';
import 'package:pdf_export_print/pdf_export_print.dart' as pw;
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'PDF Export Print Example',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.blue),
useMaterial3: true,
),
home: const PDFExamplePage(),
);
}
}
class PDFExamplePage extends StatefulWidget {
const PDFExamplePage({super.key});
@override
State<PDFExamplePage> createState() => _PDFExamplePageState();
}
class _PDFExamplePageState extends State<PDFExamplePage> {
bool _isGenerating = false;
late pw.TypeSafeDataAdapter _adapter;
late pw.PDFConfig _config;
// 模块显示控制
bool _showLogo = true;
bool _showTitle = true;
bool _showMainTable = true;
bool _showSubTable = true;
bool _showApproval = true;
bool _showFooter = true;
// 边框显示控制
bool _globalBorder = true;
bool _mainTableBorder = true;
bool _mainTableInnerBorder = true;
bool _subTableBorder = true;
bool _approvalBorder = true;
bool _footerBorder = true;
// 页面方向控制
pw.PageOrientation _orientation = pw.PageOrientation.portrait;
@override
void initState() {
super.initState();
_initializeAdapter();
}
/// 初始化适配器
void _initializeAdapter() {
// 使用自定义配置
_adapter = pw.TypeSafeDataAdapter(config: _createCustomConfig());
_config = pw.PDFConfig.builder()
.pageSize(pw.PdfPageFormat.a4)
.withOrientation(_orientation)
.margins(pw.EdgeInsets.all(20))
.build();
}
/// 创建自定义配置
pw.DataAdapterConfig _createCustomConfig() {
// 使用增强配置，支持全局映射和模块特定映射
final customFieldLabels = pw.FieldLabelConfig.enhanced(
// 全局字段映射
globalMappings: {
// 主表字段
'name': '员工姓名',
'age': '年龄',
'department': '所属部门',
'position': '岗位职务',
'email': '邮箱地址',
'phone': '联系电话',
'salary': '薪资',
'description': '工作描述',
'city': '城市',
// 页脚字段
'preparedBy': '制单人',
'checkedBy': '审核人',
'approvedBy': '批准人',
'printDate': '打印日期',
'version': '版本号',
'pageCount': '页数',
// 审批字段
'nodeName': '审批节点',
'approver': '审批人',
'signature': '签名',
'approveTime': '审批时间',
'opinion': '审批意见',
// 通用子表字段
'projectName': '项目名称',
'startDate': '开始时间',
'endDate': '结束时间',
'status': '项目状态',
'evaluation': '项目评价',
// 模块标题
pw.ModuleType.subTable.value: '子表模块',
'testDetails': '测试详情',
'approval': '审批记录',
'footer': '页脚模块',
},
// 模块特定映射
moduleMappings: {
// 测试详情模块的特定字段标签
'testDetails': {
'testName': '测试名称',
'testType': '测试类型',
'testResult': '测试结果',
'testDate': '测试日期',
'testDuration': '测试时长',
'docNo': '测试编号', // 与主表的docNo区分
'remarks': '测试备注', // 与主表的remarks区分
},
// 月度计划详情模块的特定字段标签
'monthPlanDetails': {
'docNo': '计划编号', // 与主表的docNo区分
'remarks': '计划备注', // 与主表的remarks区分
'planDate': '计划日期',
'planAmount': '计划金额',
},
},
);
// 自定义模块配置 - 使用具体的配置类型
final customModuleConfigs = <pw.ModuleType, pw.AdapterModuleConfig>{
pw.ModuleType.logo: const pw.AdapterModuleConfig(
moduleType: pw.ModuleType.logo,
moduleConfig: pw.LogoConfig(
defaultWidth: pw.LogoConstants.defaultWidth,
defaultHeight: pw.LogoConstants.defaultHeight,
bottomSpacing: pw.LogoConstants.defaultBottomSpacing,
enabled: true, // 控制模块是否参与PDF生成
priority: 1, // 数值越小优先级越高，控制在PDF中的显示顺序
required: false, // 数据验证时是否必须提供该模块的数据
),
),
pw.ModuleType.title: const pw.AdapterModuleConfig(
moduleType: pw.ModuleType.title,
moduleConfig: pw.TitleConfig(
topSpacing: 5.0,
bottomSpacing: 15.0,
titleSpacing: 5.0,
color: 'red',
enabled: true, // 启用标题模块
priority: 2, // 在Logo之后显示
required: true, // 必须提供标题数据，否则验证失败
),
),
pw.ModuleType.mainTable: const pw.AdapterModuleConfig(
moduleType: pw.ModuleType.mainTable,
fieldConfigs: [
pw.FieldConfig(fieldKey: 'position', widthPercent: 0.33, sort: 1),
pw.FieldConfig(fieldKey: 'name', widthPercent: 1, sort: 2),
pw.FieldConfig(fieldKey: 'description', widthPercent: 0.67, sort: 3),
pw.FieldConfig(fieldKey: 'department', widthPercent: 0.33, sort: 4),
pw.FieldConfig(fieldKey: 'email', widthPercent: 1, sort: 5),
],
moduleConfig: pw.MainTableConfig(
showBorder: true,
showInnerBorder: true,
cellPadding: pw.EdgeInsets.all(4),
fieldsPerRow: 3,
enabled: true,
priority: 3, // 在标题之后显示
required: false,
),
),
pw.ModuleType.subTable: const pw.AdapterModuleConfig(
moduleType: pw.ModuleType.subTable,
fieldConfigs: [
pw.FieldConfig(fieldKey: 'projectName', widthPercent: 0.4, sort: 1),
pw.FieldConfig(fieldKey: 'status', widthPercent: 0.2, sort: 2),
pw.FieldConfig(fieldKey: 'startDate', widthPercent: 0.2, sort: 3),
pw.FieldConfig(fieldKey: 'endDate', widthPercent: 0.2, sort: 4),
// 保留图片字段配置
pw.FieldConfig(fieldKey: '项目', widthPercent: 0.25, sort: 5),
pw.FieldConfig(fieldKey: '图片', widthPercent: 0.2, sort: 6),
pw.FieldConfig(fieldKey: '状态', widthPercent: 0.15, sort: 7),
pw.FieldConfig(fieldKey: '进度', widthPercent: 0.1, sort: 8),
pw.FieldConfig(fieldKey: '负责人', widthPercent: 0.15, sort: 9),
pw.FieldConfig(fieldKey: '开始时间', widthPercent: 0.35, sort: 10),
// evaluation 字段自动分配剩余空间
],
moduleConfig: pw.SubTableConfig(
showBorder: true,
cellPadding: pw.EdgeInsets.all(4),
headerHeight: 25.0,
dataAlignment: pw.Alignment.center,
enabled: true, // 启用子表模块
priority: 4,
required: false,
),
),
pw.ModuleType.approval: const pw.AdapterModuleConfig(
moduleType: pw.ModuleType.approval,
fieldConfigs: [
pw.FieldConfig(fieldKey: 'nodeName', widthPercent: 0.25, sort: 1),
pw.FieldConfig(fieldKey: 'approver', widthPercent: 0.20, sort: 2),
pw.FieldConfig(fieldKey: 'approveTime', widthPercent: 0.25, sort: 3),
pw.FieldConfig(fieldKey: 'signature', widthPercent: 0.15, sort: 4),
pw.FieldConfig(fieldKey: 'opinion', widthPercent: 0.15, sort: 5),
// 其他字段自动分配剩余空间
],
moduleConfig: pw.SubTableConfig(
showBorder: true,
cellPadding: pw.EdgeInsets.all(4),
headerHeight: 25.0,
defaultColumnWidths: pw.SubTableConfig.approvalDefaultColumnWidths,
dataAlignment: pw.Alignment.center,
enabled: true,
priority: 5,
required: false,
),
),
pw.ModuleType.footer: const pw.AdapterModuleConfig(
moduleType: pw.ModuleType.footer,
fieldConfigs: [
pw.FieldConfig(fieldKey: 'totalAmount', widthPercent: 0.67, sort: 1),
pw.FieldConfig(fieldKey: 'createDate', widthPercent: 0.33, sort: 2),
],
moduleConfig: pw.FooterConfig(
fieldsPerRow: 3,
showBorder: true,
showInnerBorder: false,
cellPadding: pw.EdgeInsets.all(4),
enabled: true,
priority: 6,
required: false,
),
),
};
// 扩展的模块描述符集合（支持自定义模块）
final customModuleDescriptors = <pw.ModuleDescriptor>{
// 标准模块描述符（使用静态常量）
pw.ModuleDescriptor.logo.copyWith(
data: {
'logoUrl': 'https://picsum.photos/100/50?random=1',
'width': 100.0,
'height': 50.0,
},
),
pw.ModuleDescriptor.title.copyWith(
data: {
'titles': ['示例文档', '副标题'],
'color': 'blue',
'alignment': 'center',
},
),
pw.ModuleDescriptor.mainTable.copyWith(
data: {
'name': '张三',
'age': 28,
'city': '北京',
'email': 'zhangsan@example.com',
'department': '技术部',
'position': '高级工程师',
'description': '软件工程师',
},
),
pw.ModuleDescriptor.subTable.copyWith(
data: [
{
'projectName': 'PDF导出系统',
'startDate': '2024-01-01',
'endDate': '2024-03-31',
'status': '已完成',
'evaluation': '优秀',
// 保留图片展示功能
'项目': 'Flutter PDF 组件',
'图片': 'https://picsum.photos/200/150?random=1',
'状态': '已发布',
'进度': '100%',
'负责人': '张三',
'开始时间': '2024-01-01',
},
{
'projectName': '用户管理平台',
'startDate': '2024-04-01',
'endDate': '2024-06-30',
'status': '进行中',
'evaluation': '良好',
// 保留图片展示功能
'项目': 'PDF 预览功能',
'图片': 'https://picsum.photos/200/150?random=2',
'状态': '开发中',
'进度': '80%',
'负责人': '李四',
'开始时间': '2024-04-01',
},
{
'projectName': '数据分析系统',
'startDate': '2024-07-01',
'endDate': '2024-09-30',
'status': '计划中',
'evaluation': '一般',
},
{
'projectName': '移动应用开发',
'startDate': '2024-10-01',
'endDate': '2024-12-31',
'status': '已完成',
'evaluation': '优秀',
},
],
),
pw.ModuleDescriptor.approval.copyWith(
data: [
{
'nodeName': '申请',
'approver': '李四',
'signature': '李四',
'approveTime': '2024-01-15 09:30:00',
'opinion': '申请提交',
},
{
'nodeName': '部门审批',
'approver': '王五',
'signature': '王五',
'approveTime': '2024-01-15 14:20:00',
'opinion': '同意',
},
{
'nodeName': '财务审批',
'approver': '赵六',
'signature': '赵六',
'approveTime': '2024-01-16 10:15:00',
'opinion': '财务审核通过',
},
],
),
pw.ModuleDescriptor.footer.copyWith(
data: {'totalAmount': '18000元', 'createDate': '2024-01-16'},
),
// 自定义模块描述符（调用方创建）
const pw.ModuleDescriptor(pw.ModuleType.subTable, 'testDetails', [
{
'testName': '单元测试',
'testType': '自动化测试',
'testResult': '通过',
'testDate': '2024-01-10',
'testDuration': '2小时',
},
{
'testName': '集成测试',
'testType': '手动测试',
'testResult': '通过',
'testDate': '2024-01-15',
'testDuration': '4小时',
},
{
'testName': '性能测试',
'testType': '压力测试',
'testResult': '待优化',
'testDate': '2024-01-20',
'testDuration': '6小时',
},
]),
};
return pw.DataAdapterConfig(
fieldLabelConfig: customFieldLabels,
moduleConfigs: customModuleConfigs,
moduleDescriptors: customModuleDescriptors,
);
}
/// 演示多子表标题配置功能
///
/// 展示如何为不同的子表实例设置不同的标题和数据源：
/// 1. 默认子表模块：数据源 'details' -> 标题 '项目详情'
/// 2. 自定义子表模块：数据源 'testDetails' -> 标题 '测试详情表'
/// 3. 审批记录模块：数据源 'approvals' -> 标题 '审批记录'
void _demonstrateMultiSubTableTitles() {
print('=== 多子表标题配置演示 ===');
print('');
print('配置的标题映射：');
print(' sub_table -> 项目详情 (默认子表，使用details数据)');
print(' testDetails -> 测试详情表 (自定义子表，使用testDetails数据)');
print(' approval -> 审批记录 (审批模块，使用approvals数据)');
print('');
print('数据源配置：');
print(' 1. details: [项目数据] -> SubTableModule()');
print(
' 2. testDetails: [测试数据] -> SubTableModule(moduleId: "testDetails")',
);
print(' 3. approvals: [审批数据] -> SubTableModule(moduleId: "approval")');
print('');
print('工作原理：');
print(' 1. 系统首先尝试使用moduleId作为数据键查找数据');
print(' 2. 如果找到，直接使用该数据进行适配');
print(' 3. 同时使用moduleId作为标题查找键');
print(' 4. 实现不同子表使用不同数据源和标题');
print('');
}
/// 更新适配器配置以反映当前的控制面板设置
void _updateAdapterConfig() {
// 根据当前控制面板设置更新模块配置
final updatedModuleConfigs =
Map<pw.ModuleType, pw.AdapterModuleConfig>.from(
_adapter.config.moduleConfigs,
);
// 更新各模块的enabled状态
if (updatedModuleConfigs.containsKey(pw.ModuleType.logo)) {
final logoConfig = updatedModuleConfigs[pw.ModuleType.logo]!;
updatedModuleConfigs[pw.ModuleType.logo] = pw.AdapterModuleConfig(
moduleType: logoConfig.moduleType,
moduleConfig: (logoConfig.moduleConfig as pw.LogoConfig).copyWith(
enabled: _showLogo,
),
fieldConfigs: logoConfig.fieldConfigs,
);
}
if (updatedModuleConfigs.containsKey(pw.ModuleType.title)) {
final titleConfig = updatedModuleConfigs[pw.ModuleType.title]!;
updatedModuleConfigs[pw.ModuleType.title] = pw.AdapterModuleConfig(
moduleType: titleConfig.moduleType,
moduleConfig: (titleConfig.moduleConfig as pw.TitleConfig).copyWith(
enabled: _showTitle,
),
fieldConfigs: titleConfig.fieldConfigs,
);
}
if (updatedModuleConfigs.containsKey(pw.ModuleType.mainTable)) {
final mainTableConfig = updatedModuleConfigs[pw.ModuleType.mainTable]!;
updatedModuleConfigs[pw.ModuleType.mainTable] = pw.AdapterModuleConfig(
moduleType: mainTableConfig.moduleType,
moduleConfig: (mainTableConfig.moduleConfig as pw.MainTableConfig)
.copyWith(
enabled: _showMainTable,
showBorder: _mainTableBorder,
showInnerBorder: _mainTableInnerBorder,
),
fieldConfigs: mainTableConfig.fieldConfigs,
);
}
if (updatedModuleConfigs.containsKey(pw.ModuleType.subTable)) {
final subTableConfig = updatedModuleConfigs[pw.ModuleType.subTable]!;
updatedModuleConfigs[pw.ModuleType.subTable] = pw.AdapterModuleConfig(
moduleType: subTableConfig.moduleType,
moduleConfig: (subTableConfig.moduleConfig as pw.SubTableConfig)
.copyWith(enabled: _showSubTable, showBorder: _subTableBorder),
fieldConfigs: subTableConfig.fieldConfigs,
);
}
if (updatedModuleConfigs.containsKey(pw.ModuleType.approval)) {
final approvalConfig = updatedModuleConfigs[pw.ModuleType.approval]!;
updatedModuleConfigs[pw.ModuleType.approval] = pw.AdapterModuleConfig(
moduleType: approvalConfig.moduleType,
moduleConfig: (approvalConfig.moduleConfig as pw.SubTableConfig)
.copyWith(enabled: _showApproval, showBorder: _approvalBorder),
fieldConfigs: approvalConfig.fieldConfigs,
);
}
if (updatedModuleConfigs.containsKey(pw.ModuleType.footer)) {
final footerConfig = updatedModuleConfigs[pw.ModuleType.footer]!;
updatedModuleConfigs[pw.ModuleType.footer] = pw.AdapterModuleConfig(
moduleType: footerConfig.moduleType,
moduleConfig: (footerConfig.moduleConfig as pw.FooterConfig).copyWith(
enabled: _showFooter,
showBorder: _footerBorder,
),
fieldConfigs: footerConfig.fieldConfigs,
);
}
// 创建新的配置
final updatedConfig = pw.DataAdapterConfig(
fieldLabelConfig: _adapter.config.fieldLabelConfig,
moduleConfigs: updatedModuleConfigs,
moduleDescriptors: _adapter.config.moduleDescriptors,
);
// 重新创建适配器
_adapter = pw.TypeSafeDataAdapter(config: updatedConfig);
}
// 水印配置控制
bool _watermarkEnabled = false;
pw.WatermarkType _watermarkType = pw.WatermarkType.text;
String _watermarkContent = 'DRAFT';
pw.WatermarkPosition _watermarkPosition = pw.WatermarkPosition.center;
pw.WatermarkMode _watermarkMode = pw.WatermarkMode.background;
double _watermarkOpacity = 0.5;
double _watermarkRotation = 0.0;
pw.PdfColor? _watermarkTextColor;
/// 生成并预览PDF
Future<void> _generatePDF() async {
setState(() {
_isGenerating = true;
});
try {
// 演示多子表标题配置功能
_demonstrateMultiSubTableTitles();
// 更新适配器配置以反映当前控制面板设置
_updateAdapterConfig();
// 数据现在来自 ModuleDescriptor，无需单独创建
print('📊 使用 ModuleDescriptor 中的内置数据');
// 创建PDF构建器
final pdfBuilder = pw.PDFPrintBuilder()
.withConfig(_config)
.withDataAdapter(_adapter);
// TypeSafe适配器会自动根据配置添加模块，无需手动添加
print('📄 开始生成PDF文档...');
final pdfDocument = await pdfBuilder.build();
print('✅ PDF文档生成完成');
// 显示PDF预览
if (mounted) {
await Navigator.push(
context,
MaterialPageRoute(
builder: (context) => PdfPreview(
build: (format) => pdfDocument.save(),
allowPrinting: true,
allowSharing: true,
canChangePageFormat: false,
canChangeOrientation: false,
canDebug: false,
),
),
);
}
} catch (e) {
print(e);
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text('PDF生成失败: $e'), backgroundColor: Colors.red),
);
}
} finally {
if (mounted) {
setState(() {
_isGenerating = false;
});
}
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('PDF Export Print 示例'),
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
// 控制面板
_buildControlPanel(),
const SizedBox(height: 16),
const SizedBox(height: 24),
ElevatedButton.icon(
onPressed: _isGenerating ? null : _generatePDF,
icon: _isGenerating
? const SizedBox(
width: 20,
height: 20,
child: CircularProgressIndicator(strokeWidth: 2),
)
: const Icon(Icons.create),
label: Text(_isGenerating ? '生成中...' : '生成PDF'),
style: ElevatedButton.styleFrom(
padding: const EdgeInsets.symmetric(vertical: 16),
textStyle: const TextStyle(fontSize: 16),
),
),
const SizedBox(height: 16),
const Card(
child: Padding(
padding: EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'功能特性',
style: TextStyle(
fontSize: 16,
fontWeight: FontWeight.bold,
),
),
SizedBox(height: 8),
Text('• 模块化设计，支持Logo、标题、主表、子表、审批、页脚模块'),
Text('• 高度可配置的样式和布局，支持跨列合并'),
Text('• 灵活的数据适配机制，自动处理复杂数据结构'),
Text('• 智能分页处理，支持大数据集自动分页'),
Text('• 支持自定义主题和企业级样式定制'),
Text('• 完整的审批流程展示和页脚信息管理'),
Text('• 🆕 子表图片展示功能，支持网络图片自适应缩放'),
Text('• 🆕 TypeSafe数据适配器，提供类型安全的数据处理'),
],
),
),
),
],
),
),
),
);
}
/// 构建控制面板
Widget _buildControlPanel() {
return Card(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text(
'控制面板',
style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
),
const SizedBox(height: 16),
// 模块显示控制
const Text(
'模块显示控制',
style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
),
const SizedBox(height: 8),
Wrap(
spacing: 16,
runSpacing: 8,
children: [
_buildModuleSwitch('Logo模块', _showLogo, (value) {
setState(() => _showLogo = value);
}),
_buildModuleSwitch('标题模块', _showTitle, (value) {
setState(() => _showTitle = value);
}),
_buildModuleSwitch('主表模块', _showMainTable, (value) {
setState(() => _showMainTable = value);
}),
_buildModuleSwitch('子表模块', _showSubTable, (value) {
setState(() => _showSubTable = value);
}),
_buildModuleSwitch('审批模块', _showApproval, (value) {
setState(() => _showApproval = value);
}),
_buildModuleSwitch('页脚模块', _showFooter, (value) {
setState(() => _showFooter = value);
}),
],
),
const SizedBox(height: 16),
const Divider(),
const SizedBox(height: 16),
// 边框显示控制
const Text(
'边框显示控制',
style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
),
const SizedBox(height: 8),
Wrap(
spacing: 16,
runSpacing: 8,
children: [
_buildModuleSwitch('全局边框', _globalBorder, (value) {
setState(() => _globalBorder = value);
}),
_buildModuleSwitch('主表边框', _mainTableBorder, (value) {
setState(() => _mainTableBorder = value);
}),
_buildModuleSwitch('主表内边框', _mainTableInnerBorder, (value) {
setState(() => _mainTableInnerBorder = value);
}),
_buildModuleSwitch('子表边框', _subTableBorder, (value) {
setState(() => _subTableBorder = value);
}),
_buildModuleSwitch('审批边框', _approvalBorder, (value) {
setState(() => _approvalBorder = value);
}),
_buildModuleSwitch('页脚边框', _footerBorder, (value) {
setState(() => _footerBorder = value);
}),
],
),
const SizedBox(height: 16),
const Divider(),
const SizedBox(height: 16),
// 页面方向控制
const Text(
'页面方向控制',
style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
),
const SizedBox(height: 8),
DropdownButton<pw.PageOrientation>(
value: _orientation,
onChanged: (pw.PageOrientation? newValue) {
if (newValue != null) {
setState(() => _orientation = newValue);
}
},
items: const [
DropdownMenuItem(
value: pw.PageOrientation.portrait,
child: Text('Portrait（竖屏）'),
),
DropdownMenuItem(
value: pw.PageOrientation.landscape,
child: Text('Landscape（横屏）'),
),
],
),
const SizedBox(height: 16),
const Divider(),
const SizedBox(height: 16),
// 水印配置控制
_buildWatermarkControls(),
],
),
),
);
}
/// 构建模块开关
Widget _buildModuleSwitch(
String label,
bool value,
ValueChanged<bool> onChanged,
) {
return SizedBox(
width: 120,
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
Switch(value: value, onChanged: onChanged),
const SizedBox(width: 8),
Expanded(child: Text(label, style: const TextStyle(fontSize: 12))),
],
),
);
}
/// 构建水印配置控制
Widget _buildWatermarkControls() {
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text(
'水印配置',
style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
),
const SizedBox(height: 8),
// 水印启用开关
_buildModuleSwitch('启用水印', _watermarkEnabled, (value) {
setState(() => _watermarkEnabled = value);
}),
if (_watermarkEnabled) ...[
const SizedBox(height: 16),
// 水印类型选择
Row(
children: [
const Text('水印类型：'),
const SizedBox(width: 8),
DropdownButton<pw.WatermarkType>(
value: _watermarkType,
onChanged: (pw.WatermarkType? newValue) {
if (newValue != null) {
setState(() => _watermarkType = newValue);
}
},
items: pw.WatermarkType.values.map((type) {
return DropdownMenuItem(
value: type,
child: Text(_getWatermarkTypeDisplayName(type)),
);
}).toList(),
),
],
),
const SizedBox(height: 8),
// 水印内容输入
Row(
children: [
const Text('水印内容：'),
const SizedBox(width: 8),
Expanded(
child: TextField(
controller: TextEditingController(text: _watermarkContent),
onChanged: (value) {
setState(() => _watermarkContent = value);
},
decoration: const InputDecoration(
border: OutlineInputBorder(),
isDense: true,
contentPadding: EdgeInsets.symmetric(
horizontal: 8,
vertical: 8,
),
),
),
),
],
),
const SizedBox(height: 8),
// 水印位置选择
Row(
children: [
const Text('水印位置：'),
const SizedBox(width: 8),
DropdownButton<pw.WatermarkPosition>(
value: _watermarkPosition,
onChanged: (pw.WatermarkPosition? newValue) {
if (newValue != null) {
setState(() => _watermarkPosition = newValue);
}
},
items: pw.WatermarkPosition.values.map((position) {
return DropdownMenuItem(
value: position,
child: Text(_getWatermarkPositionDisplayName(position)),
);
}).toList(),
),
],
),
const SizedBox(height: 8),
// 水印模式选择
Row(
children: [
const Text('水印模式：'),
const SizedBox(width: 8),
DropdownButton<pw.WatermarkMode>(
value: _watermarkMode,
onChanged: (pw.WatermarkMode? newValue) {
if (newValue != null) {
setState(() => _watermarkMode = newValue);
}
},
items: pw.WatermarkMode.values.map((mode) {
return DropdownMenuItem(
value: mode,
child: Text(_getWatermarkModeDisplayName(mode)),
);
}).toList(),
),
],
),
const SizedBox(height: 8),
// 水印颜色选择
Row(
children: [
const Text('水印颜色：'),
const SizedBox(width: 8),
DropdownButton<pw.PdfColor?>(
value: _watermarkTextColor,
onChanged: (pw.PdfColor? newValue) {
setState(() => _watermarkTextColor = newValue);
},
items: [
const DropdownMenuItem(value: null, child: Text('默认灰色')),
DropdownMenuItem(
value: pw.PdfColors.red,
child: SizedBox(
width: 60,
child: Row(
children: [
Container(width: 16, height: 16, color: Colors.red),
const SizedBox(width: 4),
const Text('红色'),
],
),
),
),
DropdownMenuItem(
value: pw.PdfColors.blue,
child: SizedBox(
width: 60,
child: Row(
children: [
Container(width: 16, height: 16, color: Colors.blue),
const SizedBox(width: 4),
const Text('蓝色'),
],
),
),
),
DropdownMenuItem(
value: pw.PdfColors.green,
child: SizedBox(
width: 60,
child: Row(
children: [
Container(width: 16, height: 16, color: Colors.green),
const SizedBox(width: 4),
const Text('绿色'),
],
),
),
),
DropdownMenuItem(
value: pw.PdfColors.orange,
child: SizedBox(
width: 60,
child: Row(
children: [
Container(
width: 16,
height: 16,
color: Colors.orange,
),
const SizedBox(width: 4),
const Text('橙色'),
],
),
),
),
DropdownMenuItem(
value: pw.PdfColors.purple,
child: SizedBox(
width: 60,
child: Row(
children: [
Container(
width: 16,
height: 16,
color: Colors.purple,
),
const SizedBox(width: 4),
const Text('紫色'),
],
),
),
),
],
),
],
),
const SizedBox(height: 8),
// 水印透明度滑块
Row(
children: [
const Text('透明度：'),
const SizedBox(width: 8),
Expanded(
child: Slider(
value: _watermarkOpacity,
min: 0.1,
max: 1.0,
divisions: 9,
label: _watermarkOpacity.toStringAsFixed(1),
onChanged: (value) {
setState(() => _watermarkOpacity = value);
},
),
),
Text(_watermarkOpacity.toStringAsFixed(1)),
],
),
// 水印旋转角度滑块
Row(
children: [
const Text('旋转角度：'),
const SizedBox(width: 8),
Expanded(
child: Slider(
value: _watermarkRotation,
min: -3.14159,
max: 3.14159,
divisions: 12,
label: '${(_watermarkRotation * 180 / 3.14159).round()}°',
onChanged: (value) {
setState(() => _watermarkRotation = value);
},
),
),
Text('${(_watermarkRotation * 180 / 3.14159).round()}°'),
],
),
],
],
);
}
/// 获取水印类型显示名称
String _getWatermarkTypeDisplayName(pw.WatermarkType type) {
switch (type) {
case pw.WatermarkType.text:
return '文本水印';
case pw.WatermarkType.image:
return '图片水印';
}
}
/// 获取水印位置显示名称
String _getWatermarkPositionDisplayName(pw.WatermarkPosition position) {
switch (position) {
case pw.WatermarkPosition.topLeft:
return '左上角';
case pw.WatermarkPosition.topCenter:
return '顶部居中';
case pw.WatermarkPosition.topRight:
return '右上角';
case pw.WatermarkPosition.centerLeft:
return '左侧居中';
case pw.WatermarkPosition.center:
return '正中央';
case pw.WatermarkPosition.centerRight:
return '右侧居中';
case pw.WatermarkPosition.bottomLeft:
return '左下角';
case pw.WatermarkPosition.bottomCenter:
return '底部居中';
case pw.WatermarkPosition.bottomRight:
return '右下角';
}
}
/// 获取水印模式显示名称
String _getWatermarkModeDisplayName(pw.WatermarkMode mode) {
switch (mode) {
case pw.WatermarkMode.background:
return '背景水印';
case pw.WatermarkMode.foreground:
return '前景水印';
}
}
}Metadata
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Metadata
A powerful and highly customizable Flutter PDF generation library with modular design.
Repository (GitHub)
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License
MIT (license)
