import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';

// リスト 6.3
void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: ImagePage()
    );
  }
}

// リスト 6.4
class ImagePage extends StatefulWidget {
  @override
  _ImagePageState createState() => _ImagePageState();
}

class _ImagePageState extends State<ImagePage> {
  File? _imageFile;
  final _picker = ImagePicker();

  Future getImage(ImageSource imageSource) async {
    final pickedFile = await _picker.pickImage(source: imageSource);
    if (pickedFile != null) {
      setState(() {
        _imageFile = File(pickedFile.path);
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('ImagePage')
      ),
      body: Stack(children: [
        if (_imageFile != null)
          Container(
            decoration: BoxDecoration(
              image: DecorationImage(
                image: Image.file(_imageFile!).image,
                fit: BoxFit.cover
              )
            )
          ),
        Align(
          alignment: Alignment.bottomCenter,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              IconButton(
                onPressed: () => getImage(ImageSource.gallery),
                icon: Icon(Icons.photo_library)
              ),
              IconButton(
                onPressed: () => getImage(ImageSource.camera),
                icon: Icon(Icons.camera_alt)
              )
            ]
          )
        )
      ])
    );
  }
}