native_pdf_renderer 4.0.1

Flutter plugin to render PDF pages as images on Web, MacOS, Windows, Android and iOS.

example/lib/main.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:native_pdf_renderer/native_pdf_renderer.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(ExampleApp());
}

class ExampleApp extends StatelessWidget {
  Future<PdfDocument> _getDocument() async {
    if (await hasPdfSupport()) {
      return PdfDocument.openAsset('assets/sample.pdf');
    }

    throw Exception(
      'PDF Rendering does not '
      'support on the system of this version',
    );
  }

  @override
  Widget build(BuildContext context) {
    SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      statusBarBrightness: Brightness.light,
      statusBarIconBrightness: Brightness.dark,
      systemNavigationBarColor: Colors.white,
      systemNavigationBarIconBrightness: Brightness.dark,
    ));

    final storage = Map<int, PdfPageImage>();

    return MaterialApp(
      title: 'PDF View example',
      color: Colors.white,
      home: Scaffold(
        body: FutureBuilder(
          future: _getDocument(),
          builder: (context, AsyncSnapshot<PdfDocument> snapshot) {
            if (!snapshot.hasData) {
              return Center(
                child: CircularProgressIndicator(),
              );
            }

            if (snapshot.hasError) {
              return Center(
                child: Text(snapshot.error.toString()),
              );
            }

            return PageView(
              children: <Widget>[
                ImageLoader(
                  storage: storage,
                  document: snapshot.data,
                  pageNumber: 1,
                ),
                ImageLoader(
                  storage: storage,
                  document: snapshot.data,
                  pageNumber: 2,
                ),
              ],
            );
          },
        ),
        bottomNavigationBar: BottomAppBar(
          child: Padding(
            padding: EdgeInsets.all(16),
            child: Row(
              mainAxisSize: MainAxisSize.max,
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Text(
                  'Swipe to right',
                  style: Theme.of(context).textTheme.headline6,
                ),
                Icon(Icons.keyboard_arrow_right),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class ImageLoader extends StatelessWidget {
  ImageLoader({
    required this.storage,
    required this.document,
    required this.pageNumber,
    Key? key,
  }) : super(key: key);

  final Map<int, PdfPageImage?> storage;
  final PdfDocument? document;
  final int pageNumber;

  @override
  Widget build(BuildContext context) => Center(
        child: FutureBuilder(
          future: _renderPage(),
          builder: (context, AsyncSnapshot<PdfPageImage?> snapshot) {
            if (snapshot.hasError) {
              return Center(
                child: Text('Error'),
              );
            }
            if (!snapshot.hasData) {
              return Center(
                child: CircularProgressIndicator(),
              );
            }

            return Image(
              image: MemoryImage(snapshot.data!.bytes),
            );
          },
        ),
      );

  Future<PdfPageImage?> _renderPage() async {
    if (storage.containsKey(pageNumber)) {
      return storage[pageNumber];
    }
    final page = await document!.getPage(pageNumber);
    final pageImage = await page.render(
      width: page.width * 2,
      height: page.height * 2,
      format: PdfPageFormat.PNG,
    );
    await page.close();
    storage[pageNumber] = pageImage;
    return pageImage;
  }
}