flutter_pdfview 1.4.5-beta.5

flutter_pdfview: ^1.4.5-beta.5 copied to clipboard

example/lib/main.dart

import 'dart:async';
import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_pdfview/flutter_pdfview.dart';
import 'package:path_provider/path_provider.dart';

void main() => runApp(const MyApp());

/// Home screen of the example app: copies the bundled sample documents to disk
/// and offers a button per document.
class MyApp extends StatefulWidget {
  /// Creates the example app.
  ///
  /// When [loadDocuments] is false, asset copies and the remote PDF download are
  /// skipped. Widget tests use this so the home screen stays deterministic and
  /// does not hit the network or file system.
  const MyApp({super.key, this.loadDocuments = true});

  /// Whether [initState] should copy sample assets and download the remote PDF.
  final bool loadDocuments;

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String pathPDF = '';
  String landscapePathPdf = '';
  String remotePDFpath = '';
  String corruptedPathPDF = '';

  @override
  void initState() {
    super.initState();
    if (!widget.loadDocuments) {
      return;
    }
    fromAsset('assets/corrupted.pdf', 'corrupted.pdf').then((f) {
      setState(() {
        corruptedPathPDF = f.path;
      });
    });
    fromAsset('assets/demo-link.pdf', 'demo.pdf').then((f) {
      setState(() {
        pathPDF = f.path;
      });
    });
    fromAsset('assets/demo-landscape.pdf', 'landscape.pdf').then((f) {
      setState(() {
        landscapePathPdf = f.path;
      });
    });

    createFileOfPdfUrl().then((f) {
      setState(() {
        remotePDFpath = f.path;
      });
    });
  }

  Future<File> createFileOfPdfUrl() async {
    final Completer<File> completer = Completer();
    debugPrint('Start download file from internet!');
    try {
      // 'https://berlin2017.droidcon.cod.newthinking.net/sites/global.droidcon.cod.newthinking.net/files/media/documents/Flutter%20-%2060FPS%20UI%20of%20the%20future%20%20-%20DroidconDE%2017.pdf';
      // final url = 'https://pdfkit.org/docs/guide.pdf';
      final url = 'http://www.pdf995.com/samples/pdf.pdf';
      final filename = url.substring(url.lastIndexOf('/') + 1);
      final request = await HttpClient().getUrl(Uri.parse(url));
      final response = await request.close();
      final bytes = await consolidateHttpClientResponseBytes(response);
      final dir = await getApplicationDocumentsDirectory();
      debugPrint('Download files');
      debugPrint('${dir.path}/$filename');
      final File file = File('${dir.path}/$filename');

      await file.writeAsBytes(bytes, flush: true);
      completer.complete(file);
    } catch (e) {
      throw Exception('Error parsing asset file!');
    }

    return completer.future;
  }

  Future<File> fromAsset(String asset, String filename) async {
    // To open from assets, you can copy them to the app storage folder, and the access them "locally"
    final Completer<File> completer = Completer();

    try {
      final dir = await getApplicationDocumentsDirectory();
      final File file = File('${dir.path}/$filename');
      final data = await rootBundle.load(asset);
      final bytes = data.buffer.asUint8List();
      await file.writeAsBytes(bytes, flush: true);
      completer.complete(file);
    } catch (e) {
      throw Exception('Error parsing asset file!');
    }

    return completer.future;
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter PDF View',
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(title: const Text('Plugin example app')),
        body: Center(
          child: Builder(
            builder: (BuildContext context) {
              return Column(
                children: <Widget>[
                  TextButton(
                    child: const Text('Open PDF'),
                    onPressed: () {
                      if (pathPDF.isNotEmpty) {
                        Navigator.push(
                          context,
                          MaterialPageRoute(builder: (context) => PDFScreen(path: pathPDF)),
                        );
                      }
                    },
                  ),
                  TextButton(
                    child: const Text('Open Landscape PDF'),
                    onPressed: () {
                      if (landscapePathPdf.isNotEmpty) {
                        Navigator.push(
                          context,
                          MaterialPageRoute(
                            builder: (context) => PDFScreen(path: landscapePathPdf),
                          ),
                        );
                      }
                    },
                  ),
                  TextButton(
                    child: const Text('Remote PDF'),
                    onPressed: () {
                      if (remotePDFpath.isNotEmpty) {
                        Navigator.push(
                          context,
                          MaterialPageRoute(builder: (context) => PDFScreen(path: remotePDFpath)),
                        );
                      }
                    },
                  ),
                  TextButton(
                    child: const Text('Open PDF (iPad Safe Mode)'),
                    onPressed: () {
                      if (pathPDF.isNotEmpty) {
                        Navigator.push(
                          context,
                          MaterialPageRoute(
                            builder: (context) => PDFScreen(path: pathPDF, isIPadSafe: true),
                          ),
                        );
                      }
                    },
                  ),
                  TextButton(
                    child: const Text('Open Corrupted PDF'),
                    onPressed: () {
                      if (pathPDF.isNotEmpty) {
                        Navigator.push(
                          context,
                          MaterialPageRoute(
                            builder: (context) => PDFScreen(path: corruptedPathPDF),
                          ),
                        );
                      }
                    },
                  ),
                ],
              );
            },
          ),
        ),
      ),
    );
  }
}

/// Full-screen viewer that renders a single document with [PDFView].
class PDFScreen extends StatefulWidget {
  /// Path of the document to display.
  final String? path;

  /// Whether to use the conservative scroll configuration that behaves best on
  /// iPad.
  final bool isIPadSafe;

  /// Creates a viewer for the document at [path].
  const PDFScreen({super.key, this.path, this.isIPadSafe = false});

  @override
  State<PDFScreen> createState() => _PDFScreenState();
}

class _PDFScreenState extends State<PDFScreen> with WidgetsBindingObserver {
  final Completer<PDFViewController> _controller = Completer<PDFViewController>();
  int? _pages = 0;
  int? _currentPage = 0;
  bool _isReady = false;
  String _errorMessage = '';

  double _xOffset = 0.0;
  double _yOffset = 0.0;
  double _scale = 1.0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Document'),
        actions: <Widget>[IconButton(icon: const Icon(Icons.share), onPressed: () {})],
      ),
      body: Stack(
        children: <Widget>[
          PDFView(
            filePath: widget.path,
            enableSwipe: true,
            // iPad Safe Mode: Avoid conflicting scroll configurations
            swipeHorizontal: widget.isIPadSafe
                ? false
                : true, // Vertical scrolling is safer on iPad
            // Spacing only — does not affect fit/zoom (#150).
            autoSpacing: widget.isIPadSafe ? true : false,
            pageFling: widget.isIPadSafe ? false : true, // Disable page fling to avoid conflicts
            pageSnap: false, // Disable page snap for smoother scrolling
            showScrollIndicators: true,
            defaultPage: _currentPage!,
            fitPolicy: FitPolicy.BOTH,
            preventLinkNavigation: false, // if set to true the link is handled in flutter
            backgroundColor: const Color(0xFFFEF7FF),
            nightMode: true,
            maxZoom: 4.0,
            minZoom: 1.0,
            onRender: (pages) {
              setState(() {
                _pages = pages;
                _isReady = true;
              });
            },
            onError: (error) {
              setState(() {
                _errorMessage = error.toString();
              });
              debugPrint(error.toString());
            },
            onPageError: (page, error) {
              setState(() {
                _errorMessage = '$page: ${error.toString()}';
              });
              debugPrint('$page: ${error.toString()}');
            },
            onViewCreated: (PDFViewController pdfViewController) {
              _controller.complete(pdfViewController);
            },
            onLinkHandler: (String? uri) {
              debugPrint('goto uri: $uri');
            },
            onPageChanged: (int? page, int? total) {
              debugPrint('page change: ${(page ?? 0) + 1}/$total');
              setState(() {
                _currentPage = page;
              });
            },
            onLoadComplete: (int? pages) {
              final pagesText = '# of pages: $pages';
              final snackBar = SnackBar(content: Text(pagesText));
              ScaffoldMessenger.of(context).showSnackBar(snackBar);
              debugPrint(pagesText);
            },
            onDraw: (double pdfXOffset, double pdfYOffset, double pdfScale) {
              setState(() {
                _xOffset = pdfXOffset;
                _yOffset = pdfYOffset;
                _scale = pdfScale;
              });
              debugPrint('onDraw - x offset: $pdfXOffset, y offset: $pdfYOffset scale: $pdfScale');
            },
          ),
          _errorMessage.isEmpty
              ? !_isReady
                    ? const Center(child: CircularProgressIndicator())
                    : Container()
              : Center(child: Text(_errorMessage)),
          Positioned(
            left: 10,
            top: 10,
            child: Container(
              color: Colors.orange,
              padding: const EdgeInsets.all(10),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  Text('X Offset: ${_xOffset.toStringAsFixed(2)}'),
                  Text('Y Offset: ${_yOffset.toStringAsFixed(2)}'),
                  Text('Scale: ${_scale.toStringAsFixed(2)}'),
                ],
              ),
            ),
          ),
        ],
      ),
      floatingActionButton: FutureBuilder<PDFViewController>(
        future: _controller.future,
        builder: (context, AsyncSnapshot<PDFViewController> snapshot) {
          final int? pages = _pages;
          if (snapshot.hasData && pages != null) {
            final int targetPage = pages ~/ 2;
            return FloatingActionButton.extended(
              label: Text('Go to $targetPage'),
              onPressed: () async {
                await snapshot.data!.setPage(targetPage);
              },
            );
          }

          return Container();
        },
      ),
    );
  }
}