fcs/lib/pages/do/photo_page.dart

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:provider/provider.dart';
import 'package:fcs/model/language_model.dart';
import 'package:fcs/theme/theme.dart';
import 'package:fcs/widget/localization/app_translations.dart';

import '../util.dart';

class PhotoPage extends StatefulWidget {
  PhotoPage({Key key}) : super(key: key);

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

class _PhotoPageState extends State<PhotoPage> {
  File receiptImageFile;

  @override
  Widget build(BuildContext context) {
    var languageModel = Provider.of<LanguageModel>(context);

    final receiptImageBox = Padding(
      padding: EdgeInsets.symmetric(vertical: 5.0),
      child: Container(
        color: Colors.grey[400],
        child: Column(
          children: <Widget>[
            Container(
              padding: EdgeInsets.only(top: 15),
              child: Text(
                AppTranslations.of(context).text('do.receipt'),
                style:
                    languageModel.isEng ? photoLabelStyle : photoLabelStyleMM,
              ),
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                ButtonTheme.bar(
                    child: new ButtonBar(
                  alignment: MainAxisAlignment.start,
                  children: <Widget>[
                    new FlatButton(
                      child: Icon(
                        Icons.add_photo_alternate,
                        size: 60.0,
                        color: Colors.black,
                      ),
                      onPressed: () {
                        pickImageFromGallery(ImageSource.gallery);
                      },
                    ),
                  ],
                )),
                ButtonTheme.bar(
                    child: new ButtonBar(
                  alignment: MainAxisAlignment.start,
                  children: <Widget>[
                    new FlatButton(
                      child: Icon(
                        Icons.add_a_photo,
                        size: 50.0,
                        color: Colors.black,
                      ),
                      onPressed: () {
                        pickImageFromCamera(ImageSource.camera);
                      },
                    ),
                  ],
                )),
              ],
            ),
            receiptShowImage(),
            SizedBox(
              height: 10,
            )
          ],
        ),
      ),
    );

    return Scaffold(
      appBar: AppBar(
        backgroundColor: primaryColor,
        title: Text(AppTranslations.of(context).text("do.receipt.title"),
            style: Provider.of<LanguageModel>(context).isEng
                ? TextStyle(fontSize: 18)
                : TextStyle(fontSize: 18, fontFamily: 'MyanmarUnicode')),
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.send),
            onPressed: () {
              if (receiptImageFile == null) {
                showMsgDialog(
                    context, "Error", "Please insert delivery receipt file");
                return;
              }
              Navigator.pop(context, receiptImageFile);
            },
          )
        ],
      ),
      body: Column(
        children: <Widget>[
          Expanded(
            child: ListView(
              shrinkWrap: true,
              padding: EdgeInsets.only(left: 24.0, right: 24.0, top: 20),
              children: <Widget>[
                receiptImageBox,
              ],
            ),
          ),
          SizedBox(
            height: 20,
          )
        ],
      ),
    );
  }

  Widget receiptShowImage() {
    return Container(
      child: receiptImageFile == null ? initialImage() : receiptEnableImage(),
    );
  }

  Widget initialImage() {
    var languageModel = Provider.of<LanguageModel>(context);

    return Center(
      child: Text(
        AppTranslations.of(context).text('do.no.photo'),
        style: languageModel.isEng ? photoLabelStyle : photoLabelStyleMM,
      ),
    );
  }

  Widget receiptEnableImage() {
    return Center(
      child: Image.file(
        receiptImageFile,
      ),
    );
  }

  pickImageFromGallery(ImageSource source) async {
    var tempImage = await ImagePicker.pickImage(
        source: source, imageQuality: 80, maxWidth: 300);
    setState(() {
      receiptImageFile = tempImage;
    });
  }

  pickImageFromCamera(ImageSource source) async {
    var tempImage = await ImagePicker.pickImage(
        source: source, imageQuality: 80, maxWidth: 300);
    setState(() {
      receiptImageFile = tempImage;
    });
  }
}