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LavanyaA
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Merge pull request #854 from LokeshPalani/master
Added missing files in the pdf folder
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‎lib/samples/pdf/import_and_export_annotation_data.dart

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///Pdf import
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import 'dart:convert';
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:syncfusion_flutter_pdf/pdf.dart';
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///Local imports
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import '../../model/sample_view.dart';
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import 'helper/save_file_mobile.dart'
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if (dart.library.html) 'helper/save_file_web.dart';
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/// Import and export Annotation data from the PDF document.
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class ImportAndExportAnnotationData extends SampleView {
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/// Import and export Annotation data from the PDF document.
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const ImportAndExportAnnotationData(Key key) : super(key: key);
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@override
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_ImportAndExportAnnotationDataState createState() =>
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_ImportAndExportAnnotationDataState();
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}
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class _ImportAndExportAnnotationDataState extends SampleViewState {
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_ImportAndExportAnnotationDataState();
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int _groupDataTypeValue = 0;
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int _groupProcessValue = 0;
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String _processText = 'Import Annotation Data';
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PdfAnnotationDataFormat _dataFormat = PdfAnnotationDataFormat.xfdf;
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String _fileExtension = 'xfdf';
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void _dataTypeChanged(int? value) {
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setState(() {
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_groupDataTypeValue = value!;
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switch (_groupDataTypeValue) {
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case 0:
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_dataFormat = PdfAnnotationDataFormat.xfdf;
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_fileExtension = 'xfdf';
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break;
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case 1:
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_dataFormat = PdfAnnotationDataFormat.json;
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_fileExtension = 'json';
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break;
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default:
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_dataFormat = PdfAnnotationDataFormat.fdf;
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_fileExtension = 'fdf';
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break;
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}
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});
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}
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void _processChanged(int? value) {
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setState(() {
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_groupProcessValue = value!;
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if (_groupProcessValue == 0) {
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_processText = 'Import Annotation Data';
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} else {
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_processText = 'Export Annotation Data';
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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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backgroundColor: model.sampleOutputCardColor,
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body: SingleChildScrollView(
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child: Padding(
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padding: const EdgeInsets.fromLTRB(10, 10, 10, 10),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: <Widget>[
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Text(
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'This sample shows how to import or export annotation data from the PDF document. It supports XFDF, FDF, and JSON format for import and export.',
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style: TextStyle(fontSize: 16, color: model.textColor)),
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const SizedBox(height: 20, width: 30),
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Text('Choose the data type for import or export:',
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style: TextStyle(
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fontSize: 16,
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color: model.textColor,
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fontWeight: FontWeight.bold)),
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const SizedBox(height: 10, width: 30),
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if (MediaQuery.of(context).size.width > 800)
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Row(children: getDataTypeChildWidgets(context))
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else
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Column(children: getDataTypeChildWidgets(context)),
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const SizedBox(height: 20, width: 30),
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Text('Select import or export:',
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style: TextStyle(
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fontSize: 16,
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color: model.textColor,
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fontWeight: FontWeight.bold)),
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const SizedBox(height: 10, width: 30),
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if (MediaQuery.of(context).size.width > 800)
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Row(children: getProcessChildWidgets(context))
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else
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Column(children: getProcessChildWidgets(context)),
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const SizedBox(height: 20, width: 30),
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Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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const SizedBox(height: 10, width: 30),
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TextButton(
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style: ButtonStyle(
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backgroundColor:
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MaterialStateProperty.all<Color>(model.primaryColor),
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padding: model.isMobile
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? null
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: MaterialStateProperty.all(
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const EdgeInsets.symmetric(
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vertical: 15, horizontal: 15)),
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),
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onPressed: _viewTemplate,
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child: const Text('View Template',
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style: TextStyle(color: Colors.white)),
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),
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const SizedBox(
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height: 10,
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width: 20,
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),
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TextButton(
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style: ButtonStyle(
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backgroundColor:
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MaterialStateProperty.all<Color>(model.primaryColor),
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padding: model.isMobile
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? null
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: MaterialStateProperty.all(
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const EdgeInsets.symmetric(
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vertical: 15, horizontal: 15)),
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),
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onPressed: _processData,
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child: Text(_processText,
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style: const TextStyle(color: Colors.white)),
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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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List<Widget> getDataTypeChildWidgets(BuildContext context) {
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return <Widget>[
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Row(children: <Widget>[
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Radio<int>(
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value: 0,
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groupValue: _groupDataTypeValue,
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onChanged: _dataTypeChanged),
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Text('XFDF', style: TextStyle(fontSize: 16, color: model.textColor)),
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]),
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Row(children: <Widget>[
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Radio<int>(
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value: 1,
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groupValue: _groupDataTypeValue,
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onChanged: _dataTypeChanged),
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Text('JSON', style: TextStyle(fontSize: 16, color: model.textColor)),
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]),
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Row(children: <Widget>[
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Radio<int>(
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value: 2,
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groupValue: _groupDataTypeValue,
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onChanged: _dataTypeChanged),
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Text('FDF', style: TextStyle(fontSize: 16, color: model.textColor)),
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])
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];
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}
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List<Widget> getProcessChildWidgets(BuildContext context) {
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return <Widget>[
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Row(children: <Widget>[
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Radio<int>(
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value: 0,
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groupValue: _groupProcessValue,
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onChanged: _processChanged),
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Text('Import', style: TextStyle(fontSize: 16, color: model.textColor)),
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]),
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Row(children: <Widget>[
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Radio<int>(
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value: 1,
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groupValue: _groupProcessValue,
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onChanged: _processChanged),
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Text('Export', style: TextStyle(fontSize: 16, color: model.textColor)),
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])
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];
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}
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Future<void> _viewTemplate() async {
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final List<int> documentBytes = await _readDocumentData(
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_groupProcessValue == 0
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? 'annotation_template.pdf'
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: 'annotations_export_template.pdf');
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await FileSaveHelper.saveAndLaunchFile(
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documentBytes, 'annotation_template.pdf');
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}
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Future<void> _processData() async {
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if (_groupProcessValue == 0) {
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await _importData();
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} else {
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await _exportData();
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}
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}
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Future<void> _importData() async {
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//Read the input PDF docuemnt bytes.
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final List<int> inputBytes =
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await _readDocumentData('annotation_template.pdf');
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//Load the PDF data
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final PdfDocument document = PdfDocument(inputBytes: inputBytes);
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//Get input file name
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final String importFileName = 'import_annotation_data.$_fileExtension';
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//Read the input form data to import.
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final List<int> importData = await _readDocumentData(importFileName);
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//Import form data
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document.importAnnotation(importData, _dataFormat);
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//Save and launch the PDF document
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final List<int> documentBytes = await document.save();
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await FileSaveHelper.saveAndLaunchFile(
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documentBytes, 'annotation_import.pdf');
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}
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Future<void> _exportData() async {
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//Read the input PDF docuemnt bytes.
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final List<int> inputBytes =
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await _readDocumentData('annotations_export_template.pdf');
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//Load the PDF data
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final PdfDocument document = PdfDocument(inputBytes: inputBytes);
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//Export the form data
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final List<int> dataBytes = document.exportAnnotation(_dataFormat);
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//Show the extracted form data.
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_showDialog(utf8.decode(dataBytes));
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}
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Future<List<int>> _readDocumentData(String name) async {
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final ByteData data = await rootBundle.load('assets/pdf/$name');
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return data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
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}
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void _showDialog(String text) {
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showDialog<Widget>(
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context: context,
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builder: (BuildContext context) {
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return AlertDialog(
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title: Text(_fileExtension.toUpperCase() + ' Data'),
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content: Scrollbar(
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child: SingleChildScrollView(
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physics: const BouncingScrollPhysics(
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parent: AlwaysScrollableScrollPhysics()),
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child: Text(text),
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),
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),
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actions: <Widget>[
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TextButton(
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onPressed: () {
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Navigator.of(context).pop();
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},
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child: const Text('Close'),
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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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