fcs/lib/pages/invoice/payment_pdf_screen.dart

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

import 'package:fcs/helpers/theme.dart';
import 'package:fcs/pages/main/model/main_model.dart';
import 'package:fcs/pages/widgets/local_text.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_pdfview/flutter_pdfview.dart';
import 'package:http/http.dart' as http;
import 'package:provider/provider.dart';
import 'package:share/share.dart';

class PaymentPDFScreen extends StatefulWidget {
  final String path;

  PaymentPDFScreen({Key key, this.path}) : super(key: key);

  _PaymentPDFScreenState createState() => _PaymentPDFScreenState();
}

class _PaymentPDFScreenState extends State<PaymentPDFScreen>
    with WidgetsBindingObserver {
  final Completer<PDFViewController> _controller =
      Completer<PDFViewController>();
  int pages = 0;
  int currentPage = 0;
  bool isReady = false;
  String errorMessage = '';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        backgroundColor: primaryColor,
        title: LocalText(context, 'invoice.pdf',
            color: Colors.white, fontSize: 20),
        leading: new IconButton(
            icon: new Icon(CupertinoIcons.back),
            onPressed: () {
              Navigator.of(context).pop();
            }),
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.file_download),
            onPressed: () async {
              // var _dir = (await getApplicationDocumentsDirectory()).path;
              // _downloadFile(widget.path, 'invoice.pdf', _dir);
            },
          ),
          IconButton(
            icon: Icon(Icons.share),
            onPressed: () => _share(widget.path),
          ),
        ],
      ),
      body: Stack(
        children: <Widget>[
          PDFView(
            filePath: widget.path,
            enableSwipe: true,
            swipeHorizontal: true,
            autoSpacing: false,
            pageFling: true,
            pageSnap: true,
            defaultPage: currentPage,
            fitPolicy: FitPolicy.BOTH,
            preventLinkNavigation:
                false, // if set to true the link is handled in flutter
            onRender: (_pages) {
              print(('pages => $pages'));
              setState(() {
                pages = _pages;
                isReady = true;
              });
            },
            onViewCreated: (PDFViewController pdfViewController) {
              _controller.complete(pdfViewController);
            },
            onLinkHandler: (String uri) {
              print('goto uri: $uri');
            },
            onPageChanged: (int page, int total) {
              print('page change: $page/$total');
              setState(() {
                currentPage = page;
              });
            },
          ),
        ],
      ),
    );
  }

  Future<File> _downloadFile(String url, String filename, String dir) async {
    var req = await http.Client().get(Uri.parse(url));
    var file = File('$dir/$filename');
    return file.writeAsBytes(req.bodyBytes);
  }

  _share(String url) async {
    MainModel mainModel = Provider.of<MainModel>(context, listen: false);
    String appUrl = mainModel.setting.appUrl;
    final RenderBox box = context.findRenderObject();
    await Share.share(
        "Join us on FCS Logistics App. Here is the link:\n $appUrl\n" + url,
        subject: "Invitation to FCS Logistics App",
        sharePositionOrigin: box.localToGlobal(Offset.zero) & box.size);
  }
}