easy_pdf_viewer 1.0.3

A flutter plugin for handling PDF files. Works on both Android & iOS

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:easy_pdf_viewer/easy_pdf_viewer.dart';

void main() => runApp(MyApp(
      progressExample: true,
    ));

class MyApp extends StatefulWidget {
  const MyApp({this.progressExample = false});

  final bool progressExample;

  @override
  State<MyApp> createState() {
    if (progressExample) return _MyAppStateWithProgress();
    return _MyAppState();
  }
}

class _MyAppStateWithProgress extends State<MyApp> {
  bool _isLoading = true;
  PDFDocument document;
  DownloadProgress downloadProgress;

  @override
  void initState() {
    loadDocument();
    super.initState();
  }

  @override
  void setState(VoidCallback fn) {
    if (mounted) {
      super.setState(fn);
    }
  }

  void loadDocument() async {

    /// Clears the cache before download, so [PDFDocument.fromURLWithDownloadProgress.downloadProgress()]
    /// is always executed (meant only for testing).
    await DefaultCacheManager().emptyCache();

    PDFDocument.fromURLWithDownloadProgress(
      'https://www.ecma-international.org/wp-content/uploads/ECMA-262_12th_edition_june_2021.pdf',
      downloadProgress: (downloadProgress) => setState(() {
        this.downloadProgress = downloadProgress;
      }),
      onDownloadComplete: (document) => setState(() {
        this.document = document;
        _isLoading = false;
      }),
    );
  }

  Widget buildProgress() {
    if (downloadProgress == null) return SizedBox();

    String parseBytesToKBs(int bytes) {
      return '${(bytes / 1000).toStringAsFixed(2)} KBs';
    }

    String progressString =
        parseBytesToKBs(downloadProgress.downloaded);
    if (downloadProgress.totalSize != null) {
      progressString += '/ ${parseBytesToKBs(downloadProgress.totalSize)}';
    }

    return Column(
      children: [
        SizedBox(height: 20),
        Text(progressString),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: SafeArea(
          child: _isLoading
              ? Center(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      CircularProgressIndicator(),
                      buildProgress(),
                    ],
                  ),
                )
              : PDFViewer(
                  document: document,
                ),
        ),
      ),
    );
  }
}

class _MyAppState extends State<MyApp> {
  bool _isLoading = true;
  PDFDocument document;

  @override
  void initState() {
    super.initState();
    loadDocument();
  }

  loadDocument() async {
    document = await PDFDocument.fromAsset('assets/sample.pdf');

    setState(() => _isLoading = false);
  }

  changePDF(value) async {
    setState(() => _isLoading = true);
    if (value == 1) {
      document = await PDFDocument.fromAsset('assets/sample2.pdf');
    } else if (value == 2) {
      document = await PDFDocument.fromURL(
        "https://www.ecma-international.org/wp-content/uploads/ECMA-262_12th_edition_june_2021.pdf",

        /* cacheManager: CacheManager(
          Config(
            "customCacheKey",
            stalePeriod: const Duration(days: 2),
            maxNrOfCacheObjects: 10,
          ),
        ), */
      );
    } else {
      document = await PDFDocument.fromAsset('assets/sample.pdf');
    }
    setState(() => _isLoading = false);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        drawer: Drawer(
          child: Column(
            children: <Widget>[
              SizedBox(height: 36),
              ListTile(
                title: Text('Load from Assets'),
                onTap: () {
                  changePDF(1);
                },
              ),
              ListTile(
                title: Text('Load from URL'),
                onTap: () {
                  changePDF(2);
                },
              ),
              ListTile(
                title: Text('Restore default'),
                onTap: () {
                  changePDF(3);
                },
              ),
            ],
          ),
        ),
        appBar: AppBar(
          title: const Text('PDFViewer'),
        ),
        body: Center(
          child: _isLoading
              ? Center(child: CircularProgressIndicator())
              : PDFViewer(
                  document: document,
                  lazyLoad: false,
                  zoomSteps: 1,
                  //uncomment below line to preload all pages
                  // lazyLoad: false,
                  // uncomment below line to scroll vertically
                  // scrollDirection: Axis.vertical,

                  //uncomment below code to replace bottom navigation with your own
                  /* navigationBuilder:
                      (context, page, totalPages, jumpToPage, animateToPage) {
                    return ButtonBar(
                      alignment: MainAxisAlignment.spaceEvenly,
                      children: <Widget>[
                        IconButton(
                          icon: Icon(Icons.first_page),
                          onPressed: () {
                            jumpToPage()(page: 0);
                          },
                        ),
                        IconButton(
                          icon: Icon(Icons.arrow_back),
                          onPressed: () {
                            animateToPage(page: page - 2);
                          },
                        ),
                        IconButton(
                          icon: Icon(Icons.arrow_forward),
                          onPressed: () {
                            animateToPage(page: page);
                          },
                        ),
                        IconButton(
                          icon: Icon(Icons.last_page),
                          onPressed: () {
                            jumpToPage(page: totalPages - 1);
                          },
                        ),
                      ],
                    );
                  }, */
                ),
        ),
      ),
    );
  }
}