Displaying a created PDF in a new tab for flutter web - flutter

Question

I am currently creating a PDF to display inputted data from the user and I want to display the pdf in a new tab so they can either print it or download it or just close out.
The current PDF creation method is:
Future<void> createPDF() async{
final PdfDocument document = PdfDocument();
document.pages.add().graphics.drawString(
'Hello World!', PdfStandardFont(PdfFontFamily.helvetica, 20),
brush: PdfSolidBrush(PdfColor(0, 0, 0)),
bounds: Rect.fromLTWH(20, 60, 150, 30));
List<int> bytes = await document.save();
document.dispose();
saveAndLaunchFile(bytes, '$NewConfig.pdf');
}
then to open the file I have this method:
Future<void> saveAndLaunchFile(List<int> bytes, String fileName) async {
Uint8List test = Uint8List.fromList(bytes);
final pdfController = PdfController(document:PdfDocument.openData(test));
PdfView(controller: pdfController);
}
The issue I am running into is the new tab that opens displays this:
37806870454946551310371311462502541310493248321119810613106060131047841211121013247679711697108111103131047809710310111532503248328213106262131010111010011198106131050324832111981061310606013104784121112101324780971031011151310477510510011532915132483282931310476711111711011632491310478210111511111711499101115326060626213101310477710110010597661111203291483248325357533256525093131062621310101110100111981061310513248321119810613106060131047671111171101163249131047841211121013247809710310111513104775105100115329152324832829313104780971141011101163250324832821310626213101011101001119810613105232483211198106131060601310478412111210132478097103101131047809711410111011632513248328213104767111110116101110116115329153324832823254324832823255324832829313104782101115111117114991011153260601310478011411199831011163291478068703247841011201169313104770111110116326060131047994998565353545345534851514552101565345985399504553565154485748981015048513256324832821310626213101310626213101310626213101011101001119810613105332483211198106131060601310477010510811610111432477010897116101681019911110010113104776101110103116104325713106262131011511611410197109131012094434001140114131010111010011511611410197109131010111010011198106131054324832111981061310606013104770105108116101114324770108971161016810199111100101131047761011101031161043257131062621310115116114101971091310120941140082082131010111010011511611410197109131010111010011198106131055324832111981061310606013104770105108116101114324770108971161016810199111100101131047761011101031161043250505713106262131011511611410197109131012094101143657534916133239129252135241322146718217921720554949169175213642071871051869320038539138254122147698014597301321532472302034337215176592471105216061243225561856225136314915325146710778105157252165162164620485841822824418812023711612918515227228989410517881108111961551426748148156415712843203422444621814625525521417525223914411496171408922315518373155231199452369425460117164423832424364215131201621976962111762147219361615719178233240147195177114221341688311317017616894244613148201231158207322789229127168204178122502141225624896143871835514860100184613795972178011310101110100115116114101971091310101110100111981061310563248321119810613106060131047841211121013247701111101161310478311798116121112101324784121112101491310476697115101701111101163247721011081181011161059997131047691109911110010511010332478710511065110115105691109911110010511010313106262131010111010011198106131012011410110213104832571310484848484848484848483254535351533210213104848484848484848495532484848484832110131048484848484848485550324848484848321101310484848484848484956483248484848483211013104848484848484850535732484848484832110131048484848484848525256324848484848321101310484848484848485351543248484848483211013104848484848484854505232484848484832110131048484848484848575152324848484848321101310116114971051081011141310606013104782111111116324932483282131047831051221013257131062621310131011511697114116120114101102131049485157131037376979701310
which I am guessing is the bytes but am at a loss as to what I am supposed to do from here.
any info?

Answer 1

I suggest you to directly use a pub package like native_pdf_view.
Its easyer than your method in my opinion and you dont need to reinvente the wheel.
EDIT:
Here is a code that i do quickly, it can be improve with a ChangeNotifier etc... to handle Future function, But it work.
main.dart
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:native_pdf_view/native_pdf_view.dart';
import 'package:syncfusion_flutter_pdf/pdf.dart' as scPdf;
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
late PdfController _pdfController;
bool isPdfLoaded = false;
Future<void> createPDF() async{
final scPdf.PdfDocument document = scPdf.PdfDocument();
document.pages.add().graphics.drawString(
'Hello World!', scPdf.PdfStandardFont(scPdf.PdfFontFamily.helvetica, 20),
brush: scPdf.PdfSolidBrush(scPdf.PdfColor(0, 0, 0)),
bounds: Rect.fromLTWH(20, 60, 150, 30));
List<int> bytes = await document.save();
document.dispose();
saveAndLaunchFile(bytes, 'test.pdf');
}
Future<void> saveAndLaunchFile(List<int> bytes, String fileName) async {
Uint8List test = Uint8List.fromList(bytes);
final pdfController = PdfController(document:PdfDocument.openData(test));
setState(() {
isPdfLoaded = true;
_pdfController = pdfController;
});
}
#override
Widget build(BuildContext context) {
var size = MediaQuery.of(context).size;
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'PDF',
),
isPdfLoaded ? Container(width : size.width, height: size.height * 0.5, child : PdfView(controller: _pdfController)) : Text("Pdf not loaded"),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: createPDF,
tooltip: 'CreatePDF',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
Re-EDIT:
This is the exemple using Navigator.push to display the pdf in another page:
main.dart
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:native_pdf_view/native_pdf_view.dart';
import 'package:stackoverflow/pdf_view.dart';
import 'package:syncfusion_flutter_pdf/pdf.dart' as scPdf;
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
late PdfController _pdfController;
bool isPdfLoaded = false;
Future<void> createPDF() async{
final scPdf.PdfDocument document = scPdf.PdfDocument();
document.pages.add().graphics.drawString(
'Hello World!', scPdf.PdfStandardFont(scPdf.PdfFontFamily.helvetica, 20),
brush: scPdf.PdfSolidBrush(scPdf.PdfColor(0, 0, 0)),
bounds: Rect.fromLTWH(20, 60, 150, 30));
List<int> bytes = await document.save();
document.dispose();
saveAndLaunchFile(bytes, 'test.pdf');
}
Future<void> saveAndLaunchFile(List<int> bytes, String fileName) async {
Uint8List test = Uint8List.fromList(bytes);
final pdfController = PdfController(document:PdfDocument.openData(test));
await Navigator.of(context).push((MaterialPageRoute(builder: (context) => PdfViewPage(pdfController: pdfController))));
}
#override
Widget build(BuildContext context) {
var size = MediaQuery.of(context).size;
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'Click on Floating button to create and open your pdf in another view',
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: createPDF,
tooltip: 'CreatePDF',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
pdf_view.dart
import 'package:flutter/material.dart';
import 'package:native_pdf_view/native_pdf_view.dart';
class PdfViewPage extends StatelessWidget {
const PdfViewPage({Key? key, required this.pdfController}) : super(key: key);
final PdfController pdfController;
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: PdfView(controller: pdfController)
),
);
}
}