huixiang_app/lib/order/invoices_manage/pdf_screen.dart

import 'dart:async';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_pdfview/flutter_pdfview.dart';

class PDFScreen extends StatefulWidget {
  final String path;
  final int inlet;

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

  _PDFScreenState createState() => _PDFScreenState();
}

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

  @override
  Widget build(BuildContext context) {
    return widget.inlet == 1 ?Material(
      type: MaterialType.transparency,
      child: Stack(
        children:  <Widget>[
          Center(
            child: Container(
              height:250,
              decoration: BoxDecoration(
                color: Colors.transparent,
              ),
              child: 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) {
                  setState(() {
                    pages = _pages;
                    isReady = true;
                  });
                },
                onError: (error) {
                  setState(() {
                    errorMessage = error.toString();
                  });
                  print(error.toString());
                },
                onPageError: (page, error) {
                  setState(() {
                    errorMessage = '$page: ${error.toString()}';
                  });
                  print('$page: ${error.toString()}');
                },
                onViewCreated: (PDFViewController pdfViewController) {
                  _controller.complete(pdfViewController);
                },
                onLinkHandler: (String uri) {
                  print('goto uri: $uri');
                },
                onPageChanged: (int page, int total) {
                  if(total >0){
                    print('page change: $page/$total');
                    setState(() {
                      currentPage = page +1;
                      pageTotal = total;
                    });
                  }else{
                    pageTotal = 1;
                  }
                },
              ),
            ),
          ),
          errorMessage.isEmpty
              ? !isReady
              ? Center(
            child: CircularProgressIndicator(),
          )
              : Container()
              : Center(
            child: Text(errorMessage),
          ),
          //pdfindex显示
          Positioned(
            width: MediaQuery.of(context).size.width,
            bottom:45,
            child: Center(
              child: Text("${currentPage}/${pageTotal}",style: TextStyle(color: Colors.white,fontSize: 16)),
            ),
          ),
        ],
      ),
    ):Scaffold(
      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) {
              setState(() {
                pages = _pages;
                isReady = true;
              });
            },
            onError: (error) {
              setState(() {
                errorMessage = error.toString();
              });
              print(error.toString());
            },
            onPageError: (page, error) {
              setState(() {
                errorMessage = '$page: ${error.toString()}';
              });
              print('$page: ${error.toString()}');
            },
            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;
                pageTotal = total;
              });
            },
          ),
          errorMessage.isEmpty
              ? !isReady
              ? Center(
            child: CircularProgressIndicator(),
          )
              : Container()
              : Center(
            child: Text(errorMessage),
          ),
          //pdfindex显示
          Positioned(
            bottom: 45,
            width: MediaQuery.of(context).size.width,
            child: Center(
              child: Text("${currentPage+1}/${pageTotal}",style: TextStyle(color: Colors.black,fontSize: 16)),
            ),
          ),
          Positioned(//右上角关闭按钮
            right: 10,
            top: MediaQuery.of(context).padding.top,
            child: IconButton(
              icon: Icon(Icons.close,size: 30,color: Colors.black,),
              onPressed: (){
                Navigator.of(context).pop();
              },
            ),
          ),
        ],
      ),

    );

  }
}