image_crop 0.1.1

A flutter plugin to crop image on iOS and Android. It processes image files off main thread natively. The plugin provides a Crop widget to display image cropping to a user.

example/lib/main.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:image_crop/image_crop.dart';

// Hidden import to let `flutter packages pub publish --dry-run` complete without errors
// FIXME: uncomment to try out example code
// import 'package:image_picker/image_picker.dart';

void main() {
  SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
    statusBarColor: Colors.transparent,
    statusBarBrightness: Brightness.dark,
    statusBarIconBrightness: Brightness.light,
    systemNavigationBarIconBrightness: Brightness.light,
  ));

  runApp(new MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final cropKey = GlobalKey<CropState>();
  File _file;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: SafeArea(
        child: Container(
          color: Colors.black,
          padding: const EdgeInsets.symmetric(vertical: 40.0, horizontal: 20.0),
          child: _file == null ? _buildOpeningImage() : _buildCroppingImage(),
        ),
      ),
    );
  }

  Widget _buildOpeningImage() {
    return Center(child: _buildOpenImage());
  }

  Widget _buildCroppingImage() {
    return Column(
      children: <Widget>[
        Expanded(
          child: Crop.file(
            _file,
            key: cropKey,
          ),
        ),
        Container(
          padding: const EdgeInsets.only(top: 20.0),
          alignment: AlignmentDirectional.center,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: <Widget>[
              FlatButton(
                child: Text(
                  'Crop Image',
                  style: Theme.of(context).textTheme.button.copyWith(color: Colors.white),
                ),
                onPressed: () => _cropImage(),
              ),
              _buildOpenImage(),
            ],
          ),
        )
      ],
    );
  }

  Widget _buildOpenImage() {
    return FlatButton(
      child: Text(
        'Open Image',
        style: Theme.of(context).textTheme.button.copyWith(color: Colors.white),
      ),
      onPressed: () => _openImage(),
    );
  }

  Future<void> _openImage() async {
    final file = await ImagePicker.pickImage(source: ImageSource.gallery);
    final sample = await ImageCrop.sampleImage(file: file, preferredSize: 2000);

    setState(() {
      _file = sample;
    });
  }

  Future<void> _cropImage() async {
    final scale = cropKey.currentState.scale;
    final area = cropKey.currentState.area;
    if (area == null) {
      // cannot crop, widget is not setup
      return;
    }

    final file = await ImageCrop.cropImage(file: _file, area: area, scale: scale);
    debugPrint('$file');
  }
}