store current page to restore and navigate to latest page which we read about flutter_cached_pdfview HOT 6 CLOSED

   PDF(
           defaultPage: //get page from sharedPreference
           onPageChanged: (page, total) {
            //save page to sharedPreference
             },
          ).cachedFromUrl('http://africau.edu/images/default/sample.pdf')

class _ShowPdfFromUrlState extends State<ShowPdfFromUrl> {
  final Completer<PDFViewController> _pdfViewController = Completer<PDFViewController>();
  final ValueNotifier<int> _pageCount = ValueNotifier<int>(0);
  final ValueNotifier<int> _currentPage = ValueNotifier<int>(1);
  Preference<int> _pdfPageIndex;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
  }

  @override
  Widget build(BuildContext context) {
    _pdfPageIndex = Provider.of<ApplicationSettings>(context).pdfPageIndex ?? 0;

    return Scaffold(
      appBar: AppBar(
        title: Row(
          mainAxisAlignment: MainAxisAlignment.start,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Icon(Icons.picture_as_pdf),
            Expanded(
              child: Text(
                ' - ${widget.productName}',
                overflow: TextOverflow.ellipsis,
                maxLines: 1,
              ),
            ),
          ],
        ),
      ),
      body: PreferenceBuilder(
        preference: _pdfPageIndex,
        builder: (context, int pageIndex) {
          return Stack(
            children: [
              PDF(
                onPageChanged: (page, total) {
                  _pageCount.value = total;
                  _currentPage.value = page == 0 ? 1 : page;
                  _pdfPageIndex.setValue(_currentPage.value);
                  print('CURRENT PAGE: ${_currentPage.value}');
                },
                onViewCreated: (PDFViewController pdfViewController) async {
                  _pdfViewController.complete(pdfViewController);
                  _pageCount.value = await pdfViewController.getPageCount();
                  print('SAVED PAGE: ${_pdfPageIndex.getValue()}');

                  pdfViewController.setPage(_pdfPageIndex.getValue());

                  /* this code don't work too */
                  //pdfViewController.setPage(30);

                },
              ).cachedFromUrl(
                '${widget.pdfUrl}',
                placeholder: (progress) => Center(child: Text('Yükleniyor $progress %')),
                errorWidget: (error) {
                  return Container(
                    width: double.infinity,
                    height: double.infinity,
                    child: Center(
                        child: Column(
                      mainAxisSize: MainAxisSize.max,
                      mainAxisAlignment: MainAxisAlignment.start,
                      crossAxisAlignment: CrossAxisAlignment.center,
                      children: [
                        Text('PDF hatası indiriliyor'),
                        Padding(
                          padding: const EdgeInsets.only(top: 16.0),
                          child: OutlineButton(
                            onPressed: () {
                              setState(() {});
                            },
                            child: Text('lütfen tekrar deneyin'),
                          ),
                        ),
                      ],
                    )),
                  );
                },
              ),
              Positioned(
                top: 8.0,
                left: 8.0,
                child: ValueListenableBuilder2<int, int>(
                  _pageCount,
                  _currentPage,
                  builder: (_, count, current, __) {
                    return Container(
                      padding: EdgeInsets.all(8.0),
                      decoration: BoxDecoration(
                        borderRadius: BorderRadius.circular(8.0),
                        color: Colors.black,
                      ),
                      child: Text(
                        '$current / ($count)',
                        style: TextStyle(
                          color: Colors.white,
                        ),
                      ),
                    );
                  },
                ),
              ),
            ],
          );
        },
      ),
    );
  }
}

class ValueListenableBuilder2<A, B> extends StatelessWidget {
  ValueListenableBuilder2(
    this.first,
    this.second, {
    Key key,
    this.builder,
    this.child,
  }) : super(key: key);

  final ValueListenable<A> first;
  final ValueListenable<B> second;
  final Widget child;
  final Widget Function(BuildContext context, A a, B b, Widget child) builder;

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<A>(
      valueListenable: first,
      builder: (_, a, __) {
        return ValueListenableBuilder<B>(
          valueListenable: second,
          builder: (context, b, __) {
            return builder(context, a, b, child);
          },
        );
      },
    );
  }
}

class _ShowPdfFromUrlState extends State<ShowPdfFromUrl> {
  final Completer<PDFViewController> _pdfViewController = Completer<PDFViewController>();
  final ValueNotifier<int> _pageCount = ValueNotifier<int>(0);
  final ValueNotifier<int> _currentPage = ValueNotifier<int>(1);
  Preference<int> _pdfPageIndex;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
  }

  @override
  Widget build(BuildContext context) {
    _pdfPageIndex = Provider.of<ApplicationSettings>(context).pdfPageIndex ?? 0;

    return Scaffold(
      appBar: AppBar(
        title: Row(
          mainAxisAlignment: MainAxisAlignment.start,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Image.asset(
              'assets/images/acrobat.png',
              width: 40.0,
            ),
            Expanded(
              child: Text(
                ' - ${widget.productName}',
                overflow: TextOverflow.ellipsis,
                maxLines: 1,
              ),
            ),
          ],
        ),
      ),
      body: Stack(
        children: [
          PDF(
            onPageChanged: (page, total) {
              _pageCount.value = total;
              _currentPage.value = page;
              _pdfPageIndex.setValue(_currentPage.value);
              print('CURRENT PAGE: ${_currentPage.value}');
              print('SAVED PAGE: ${_pdfPageIndex.getValue()}');
            },
            onViewCreated: (PDFViewController pdfViewController) async {
              _pdfViewController.complete(pdfViewController);
              _pageCount.value = await pdfViewController.getPageCount();
            },
          ).cachedFromUrl(
            '${widget.pdfUrl}',
            placeholder: (progress) => Center(child: Text('Yükleniyor $progress %')),
            errorWidget: (error) {
              return Container(
                width: double.infinity,
                height: double.infinity,
                child: Center(
                    child: Column(
                      mainAxisSize: MainAxisSize.max,
                      mainAxisAlignment: MainAxisAlignment.start,
                      crossAxisAlignment: CrossAxisAlignment.center,
                      children: [
                        Text('PDF hatası indiriliyor'),
                        Padding(
                          padding: const EdgeInsets.only(top: 16.0),
                          child: OutlineButton(
                            onPressed: () {
                              setState(() {});
                            },
                            child: Text('lütfen tekrar deneyin'),
                          ),
                        ),
                      ],
                    )),
              );
            },
          ),
          FutureBuilder<PDFViewController>(
            future: _pdfViewController.future,
            builder: (_, AsyncSnapshot<PDFViewController> snapshot) {
              if (snapshot.hasData && snapshot.data != null) {
                final PDFViewController pdfController = snapshot.data;
                pdfController.setPage(_pdfPageIndex.getValue());
                return Positioned(
                  top: 8.0,
                  left: 8.0,
                  child: ValueListenableBuilder2<int, int>(
                    _pageCount,
                    _currentPage,
                    builder: (_, count, current, __) {
                      return Container(
                        padding: EdgeInsets.all(8.0),
                        decoration: BoxDecoration(
                          borderRadius: BorderRadius.circular(8.0),
                          color: Colors.black,
                        ),
                        child: Text(
                          '$current / ($count)',
                          style: TextStyle(
                            color: Colors.white,
                          ),
                        ),
                      );
                    },
                  ),
                );
              } else {
                return Container();
              }
            },
          ),
        ],
      ),
    );
  }
}

import 'dart:async';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:caferilik/core/database/cache_ebook.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_cached_pdfview/flutter_cached_pdfview.dart';
import 'package:hive/hive.dart';

class ShowPdfFromUrl extends StatefulWidget {
  final String pdfUrl;
  final String productName;

  ShowPdfFromUrl({@required this.pdfUrl, @required this.productName});

  @override
  _ShowPdfFromUrlState createState() => _ShowPdfFromUrlState();
}

class _ShowPdfFromUrlState extends State<ShowPdfFromUrl> {
  final Completer<PDFViewController> _pdfViewController = Completer<PDFViewController>();
  final StreamController<String> _pageCountController = StreamController<String>();
  final TextEditingController _controller = TextEditingController();
  Box cacheEbook;
  int cachedIndex = 0;

  @override
  void initState() {
    super.initState();
    cacheEbook = Hive.box('cache_ebook');
    cachedIndex = cacheEbook.values.toList().indexWhere((ebook) => ebook.productName == widget.productName);
    if (cachedIndex < 0) {
      var _c = CacheEbook()
        ..productName = widget.productName
        ..currentPage = 0;
      cacheEbook.add(_c);
      cachedIndex = cacheEbook.length - 1;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Row(
          mainAxisAlignment: MainAxisAlignment.start,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Image.asset(
              'assets/images/acrobat.png',
              width: 40.0,
            ),
            Expanded(
              child: Text(
                ' ${widget.productName}',
                overflow: TextOverflow.ellipsis,
                maxLines: 1,
              ),
            ),
          ],
        ),
      ),
      body: Stack(
        children: [
          PDF(
            onPageChanged: (page, total) {
              //_pageCount.value = total;
              //_currentPage.value = page;
              //_pdfPageIndex.setValue(_currentPage.value);
              //print('CURRENT PAGE: ${_currentPage.value}');
              //print('SAVED PAGE: ${_pdfPageIndex.getValue()}');

              if (page > 0) {
                var _c = CacheEbook()
                  ..productName = widget.productName
                  ..currentPage = page;
                cacheEbook.putAt(cachedIndex, _c);
              }
            },
            onViewCreated: (PDFViewController pdfViewController) async {
              _pdfViewController.complete(pdfViewController);
              //_pageCount.value = await pdfViewController.getPageCount();
            },
          ).cachedFromUrl(
            '${widget.pdfUrl}',
            placeholder: (progress) => Center(child: Text('Yükleniyor $progress %')),
            errorWidget: (error) {
              return Container(
                width: double.infinity,
                height: double.infinity,
                child: Center(
                    child: Column(
                  mainAxisSize: MainAxisSize.max,
                  mainAxisAlignment: MainAxisAlignment.start,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: [
                    Text('PDF hatası indiriliyor'),
                    Padding(
                      padding: const EdgeInsets.only(top: 16.0),
                      child: OutlineButton(
                        onPressed: () {
                          setState(() {});
                        },
                        child: Text('lütfen tekrar deneyin'),
                      ),
                    ),
                  ],
                )),
              );
            },
          ),
          Align(
            alignment: Alignment.bottomCenter,
            child: FutureBuilder<PDFViewController>(
              future: _pdfViewController.future,
              builder: (_, AsyncSnapshot<PDFViewController> snapshot) {
                final PDFViewController pdfController = snapshot.data;

                return Card(
                  margin: EdgeInsets.zero,
                  child: BottomAppBar(
                    shape: const CircularNotchedRectangle(),
                    child: Container(
                      height: kBottomNavigationBarHeight,
                      child: Row(
                        mainAxisSize: MainAxisSize.max,
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[
                          SizedBox(
                            width: 16.0,
                          ),
                          IconButton(
                              icon: Icon(Icons.add),
                              onPressed: () async {
                                final int currentPage = await pdfController.getCurrentPage() + 1;
                                final int numberOfPages = await pdfController.getPageCount();
                                if (numberOfPages > currentPage) {
                                  await pdfController.setPage(currentPage);
                                  var _c = CacheEbook()
                                    ..productName = widget.productName
                                    ..currentPage = currentPage;
                                  cacheEbook.putAt(cachedIndex, _c);
                                }
                              }),
                          SizedBox(
                            width: 16.0,
                          ),
                          IconButton(
                              icon: Icon(Icons.remove),
                              onPressed: () async {
                                final int currentPage = await pdfController.getCurrentPage() - 1;
                                if (currentPage >= 0) {
                                  await pdfController.setPage(currentPage);
                                  var _c = CacheEbook()
                                    ..productName = widget.productName
                                    ..currentPage = currentPage;
                                  cacheEbook.putAt(cachedIndex, _c);
                                }
                              }),
                          SizedBox(
                            width: 16.0,
                          ),
                          /*Expanded(
                              child: TextFormField(
                            controller: _controller,
                            decoration: InputDecoration(hintText: 'Page Number'),
                          )),
                          SizedBox(
                            width: 16.0,
                          ),*/

                          Spacer(),
                          ValueListenableBuilder(
                            valueListenable: cacheEbook.listenable(),
                            builder: (context, Box box, child) {
                              return RaisedButton(
                                onPressed: () async => await pdfController.setPage(box.getAt(cachedIndex).currentPage),
                                child: Row(
                                  mainAxisAlignment: MainAxisAlignment.center,
                                  crossAxisAlignment: CrossAxisAlignment.center,
                                  children: <Widget>[
                                    Text('Kitap Ayracı (${box.getAt(cachedIndex).currentPage})'),
                                    Icon(Icons.double_arrow),
                                  ],
                                ),
                              );
                            },
                          ),
                          SizedBox(
                            width: 16.0,
                          ),
                        ],
                      ),
                    ),
                  ),
                );
              },
            ),
          )
        ],
      ),
    );
  }

  @override
  void dispose() {
    _pageCountController.close();
    super.dispose();
  }
}

class ValueListenableBuilder2<A, B> extends StatelessWidget {
  ValueListenableBuilder2(
    this.first,
    this.second, {
    Key key,
    this.builder,
    this.child,
  }) : super(key: key);

  final ValueListenable<A> first;
  final ValueListenable<B> second;
  final Widget child;
  final Widget Function(BuildContext context, A a, B b, Widget child) builder;

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<A>(
      valueListenable: first,
      builder: (_, a, __) {
        return ValueListenableBuilder<B>(
          valueListenable: second,
          builder: (context, b, __) {
            return builder(context, a, b, child);
          },
        );
      },
    );
  }
}