adding packages
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## Example
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```dart
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:image/image.dart' as image;
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import 'package:image_resizer/image_resizer.dart';
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import 'package:universal_html/html.dart' as html;
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void main() => runApp(MyApp());
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class MyApp extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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debugShowCheckedModeBanner: false,
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title: 'Flutter Icon Resizer',
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theme: ThemeData(
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primarySwatch: Colors.blue,
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),
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home: HomeScreen(),
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);
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}
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}
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class HomeScreen extends StatefulWidget {
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@override
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_HomeScreenState createState() => _HomeScreenState();
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}
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class _HomeScreenState extends State<HomeScreen> {
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Map<String, List<FileData>> _files;
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List<int> _imageData;
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bool _loading = false;
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@override
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void initState() {
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rootBundle.load("web/icons/Icon-512.png").then((bytes) async {
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_imageData = bytes.buffer.asUint8List();
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_refresh();
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});
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super.initState();
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}
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Future _refresh() async {
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_files = {};
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_setLoading(true);
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await _generateIcons('iOS Icons', IosIconsFolder());
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await _generateIcons('Web Icons', WebIconsFolder());
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await _generateIcons('MacOS Icons', MacOSIconsFolder());
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await _generateIcons('Android Icons', AndroidIconsFolder());
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_setLoading(false);
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}
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void _setLoading(bool value) {
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if (mounted)
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setState(() {
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_loading = value;
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});
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}
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Future _generateIcons(String key, ImageFolder folder) async {
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final _image = image.decodePng(_imageData);
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final _gen = IconGenerator();
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final _archive =
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await _gen.generateIcons(_image, folder, writeToDiskIO: false);
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if (mounted)
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setState(() {
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_files[key] = _archive;
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});
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}
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Future _archive() async {
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final _gen = IconGenerator();
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List<FileData> _images = [];
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for (var key in _files.keys) {
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final _folder = _files[key];
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_images.addAll(_folder.toList());
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}
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print("Images: ${_images.length}");
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final _data = _gen.generateArchive(_images);
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await saveFile('images.zip', binaryData: _data);
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}
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Future<bool> saveFile(
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String fileName, {
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String initialDirectoryDesktop,
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List<int> binaryData,
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bool silentErrors = false,
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}) async {
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if (kIsWeb) {
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Uri dataUrl;
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try {
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if (binaryData != null) {
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dataUrl = Uri.dataFromBytes(binaryData);
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}
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} catch (e) {
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if (!silentErrors) {
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throw Exception("Error Creating File Data: $e");
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}
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return false;
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}
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final _element = html.AnchorElement()
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..href = dataUrl.toString()
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..setAttribute("download", fileName);
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_element.click();
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return true;
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}
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final _file = File(fileName)..createSync();
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_file.writeAsBytesSync(binaryData);
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return true;
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}
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Future _upload() async {
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_setLoading(true);
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final _upload = html.FileUploadInputElement();
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_upload.accept = 'image/*';
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_upload.click();
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final _file = await _upload.onChange.first;
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if (_file != null) {
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List<html.File> files = (_file.target as dynamic).files;
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final f = files.first;
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final reader = new html.FileReader();
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reader.readAsArrayBuffer(f);
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await reader.onLoadEnd.first;
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_imageData = reader.result as List<int>;
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_refresh();
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}
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_setLoading(false);
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return;
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text('Image Resizer'),
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actions: <Widget>[
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if (kIsWeb) ...[
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IconButton(
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icon: Icon(Icons.file_upload),
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onPressed: _loading ? null : _upload,
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),
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],
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IconButton(
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icon: Icon(Icons.archive),
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onPressed: _archive,
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),
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],
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),
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body: _files != null
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? ListView.separated(
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separatorBuilder: (context, index) => Container(
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height: 1.0,
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color: Colors.grey,
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),
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itemCount: _files.keys.length,
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itemBuilder: (context, index) {
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final _key = _files.keys.toList()[index];
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final _folder = _files[_key];
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return Padding(
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padding: const EdgeInsets.all(8.0),
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child: Column(
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children: <Widget>[
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Text(
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_key,
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style: Theme.of(context).textTheme.headline4,
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),
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Padding(
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padding: const EdgeInsets.all(8.0),
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child: Wrap(
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children: _folder.map((file) {
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return Padding(
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padding: const EdgeInsets.all(8.0),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: <Widget>[
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Container(
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height: 200.0,
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width: 200.0,
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child: Card(
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child: Image.memory(
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Uint8List.fromList(file.data),
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),
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),
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),
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Text(file.name),
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],
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),
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);
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}).toList(),
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),
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),
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],
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),
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);
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},
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)
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: Center(child: CircularProgressIndicator()),
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floatingActionButton: FloatingActionButton(
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onPressed: _refresh,
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tooltip: 'Generate Icons',
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child: Icon(Icons.refresh),
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),
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);
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}
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}
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```
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