[Flutter] Image Crop & Rotate ( 이미지 자르기 & 회전 )

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본문에서 소스는, Android 만을 예제로 만들어졌음을 미리 말씀드립니다.

이미지를 회전하고 자르는 방법은 여러가지가 있겠지만, image_cropper 라는 Flutter SDK를 이용하시면,

그 어떤 방법보다 간단하고 신속하게 해당 기능을 사용할 수 있습니다.

1. Dependency 추가

# 이번 샘플 작성을 위한 dependency 추가
image_cropper: ^3.0.0
dotted_border: ^2.0.0+2
image_picker: ^0.8.5+3

터미널에서 flutter pub get 실행

- Android

[AndroidManifest.xml]

<activity
    android:name="com.yalantis.ucrop.UCropActivity"
    android:screenOrientation="portrait"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar"/>

AndroidManifest.xml 에 해당 내용을 추가해주도록 합니다.

- iOS

-설정 필요 없음-

- Web

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/croppie/2.6.5/croppie.css" />
<script defer src="https://cdnjs.cloudflare.com/ajax/libs/exif-js/2.3.0/exif.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/croppie/2.6.5/croppie.min.js"></script>

해당 내용을 index.html 의 <head> 태그 내부에 기입해주도록 합니다.

이로써, cropper 사용에 대한 준비는 마쳤습니다.

2. Dart Source

[main.dart]

import 'dart:io';

import 'package:dotted_border/dotted_border.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

import 'package:image_cropper/image_cropper.dart';
import 'package:image_picker/image_picker.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
          primarySwatch: Colors.blue,
          highlightColor: const Color(0xFFEA6357),
          backgroundColor: const Color(0xFFFDF5EC),
          canvasColor: const Color(0xFFFDF5EC),
          textTheme: TextTheme(
            headline5: ThemeData.light()
                .textTheme
                .headline5!
                .copyWith(color: const Color(0xFFEA6357)),
          ),
          iconTheme: IconThemeData(
            color: Colors.grey[600],
          ),
          appBarTheme: const AppBarTheme(
            backgroundColor: Color(0xFFEA6357),
            centerTitle: false,
            foregroundColor: Colors.white,
            actionsIconTheme: IconThemeData(color: Colors.white),
          ),
          elevatedButtonTheme: ElevatedButtonThemeData(
            style: ButtonStyle(
              backgroundColor: MaterialStateColor.resolveWith(
                      (states) => const Color(0xFFEA6357)),
            ),
          ),
          outlinedButtonTheme: OutlinedButtonThemeData(
            style: ButtonStyle(
              foregroundColor: MaterialStateColor.resolveWith(
                    (states) => const Color(0xFFEA6357),
              ),
              side: MaterialStateBorderSide.resolveWith(
                      (states) => const BorderSide(color: Color(0xFFEA6357))),
            ),
          )),
      home: const HomePage(title: 'Image Cropping'),
    );
  }
}

class HomePage extends StatefulWidget {
  final String title;

  const HomePage({
    Key? key,
    required this.title,
  }) : super(key: key);

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

class _HomePageState extends State<HomePage> {
  XFile? _pickedFile;
  CroppedFile? _croppedFile;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(widget.title)),
      body: Column(
        mainAxisSize: MainAxisSize.max,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Expanded(child: BodyWidget()),
        ],
      ),
    );
  }

  Widget BodyWidget() {
    if (_croppedFile != null || _pickedFile != null) {
      return ImageCardWiget();
    } else {
      return UploaderCardWidget();
    }
  }

  /**
   * ImageCard Widget
   */
  Widget ImageCardWiget() {
    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Padding(
            padding:
            const EdgeInsets.symmetric(horizontal: 16.0),
            child: Card(
              elevation: 4.0,
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: ImageWidget(),
              ),
            ),
          ),
          const SizedBox(height: 24.0),
          MenuWidget(),
        ],
      ),
    );
  }

  /**
   * 실제 이미지 Widget
   */
  Widget ImageWidget() {
    final screenWidth = MediaQuery.of(context).size.width;
    final screenHeight = MediaQuery.of(context).size.height;
    if (_croppedFile != null) {
      final path = _croppedFile!.path;
      return ConstrainedBox(
        constraints: BoxConstraints(
          maxWidth: 0.8 * screenWidth,
          maxHeight: 0.7 * screenHeight,
        ),
        child: Image.file(File(path)),
      );
    } else if (_pickedFile != null) {
      final path = _pickedFile!.path;
      return ConstrainedBox(
        constraints: BoxConstraints(
          maxWidth: 0.8 * screenWidth,
          maxHeight: 0.7 * screenHeight,
        ),
        child: Image.file(File(path)),
      );
    } else {
      return const SizedBox.shrink();
    }
  }

  /**
   * 이미지 카드 위젯 내 버튼
   */
  Widget MenuWidget() {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        FloatingActionButton(
          onPressed: () {
            fn_clear();
          },
          backgroundColor: Colors.redAccent,
          tooltip: 'Delete',
          child: const Icon(Icons.delete),
        ),
        if (_croppedFile == null)
          Padding(
            padding: const EdgeInsets.only(left: 32.0),
            child: FloatingActionButton(
              onPressed: () {
                fn_cropImage();
              },
              backgroundColor: const Color(0xFFEA6357),
              tooltip: 'Crop',
              child: const Icon(Icons.crop),
            ),
          )
      ],
    );
  }

  /*
  * Image Upload Widget
  * */
  Widget UploaderCardWidget() {
    return Center(
      child: Card(
        elevation: 4.0,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(16.0),
        ),
        child: SizedBox(
          width: 320.0,
          height: 300.0,
          child: Column(
            mainAxisSize: MainAxisSize.max,
            crossAxisAlignment: CrossAxisAlignment.center,
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Expanded(
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: DottedBorder(
                    radius: const Radius.circular(12.0),
                    borderType: BorderType.RRect,
                    dashPattern: const [8, 4],
                    color: Theme.of(context).highlightColor.withOpacity(0.4),
                    child: Center(
                      child: Column(
                        mainAxisSize: MainAxisSize.min,
                        crossAxisAlignment: CrossAxisAlignment.center,
                        children: [
                          Icon(
                            Icons.image,
                            color: Theme.of(context).highlightColor,
                            size: 80.0,
                          ),
                          const SizedBox(height: 24.0),
                          Text(
                            'Upload an image to start',
                            style: Theme.of(context)
                                .textTheme
                                .bodyText2!
                                .copyWith(
                                color:
                                Theme.of(context).highlightColor),
                          )
                        ],
                      ),
                    ),
                  ),
                ),
              ),
              Padding(
                padding: const EdgeInsets.symmetric(vertical: 24.0),
                child: ElevatedButton(
                  onPressed: () {
                    fn_uploadImage();
                  },
                  child: const Text('Upload'),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  /**
   * 수정된 이미지를 받아서 기존 변수 _croppedFile에 수정된 이미지로 덮어씌움.
   */
  Future<void> fn_cropImage() async {
    if (_pickedFile != null) {
      final croppedFile = await ImageCropper().cropImage(
        sourcePath: _pickedFile!.path,
        compressFormat: ImageCompressFormat.jpg,
        compressQuality: 100,
        uiSettings: [
          AndroidUiSettings(
              toolbarTitle: 'Cropper',
              toolbarColor: Colors.deepOrange,
              toolbarWidgetColor: Colors.white,
              initAspectRatio: CropAspectRatioPreset.original,
              lockAspectRatio: false),
        ],
      );
      if (croppedFile != null) {
        setState(() {
          _croppedFile = croppedFile;
        });
      }
    }
  }

  /**
   * 이미지 업로드 함수
   */
  Future<void> fn_uploadImage() async {
    final pickedFile =
    await ImagePicker().pickImage(source: ImageSource.gallery);
    if (pickedFile != null) {
      setState(() {
        _pickedFile = pickedFile;
      });
    }
  }

  void fn_clear() {
    setState(() {
      _pickedFile = null;
      _croppedFile = null;
    });
  }
}

3. 실행

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