plateaukao

import 'dart:io' as Io;
import 'package:image/image.dart';
void main() {
  // Read an image from file (webp in this case).
  // decodeImage will identify the format of the image and use the appropriate
  // decoder.
  Image image = decodeImage(new Io.File('test.webp').readAsBytesSync());

  // Resize the image to a 120x? thumbnail (maintaining the aspect ratio).
  Image thumbnail = copyResize(image, 120);

plateaukao

  Future<dynamic> downloadImage() async {
    String dir = (await getApplicationDocumentsDirectory()).path;
    File file = new File('$dir/$filename');

    if (file.existsSync()) {
      print('file already exist');
      var image = await file.readAsBytes();
      return image;
    } else {
      print('file not found downloading from server');

plateaukao

  Future<Uint8List> _downloadImage() async {
    String dir = (await getApplicationDocumentsDirectory()).path;
    File file = new File('$dir/$_filename');

    if (file.existsSync()) {
      var image = await file.readAsBytes();
      return image;
    } else {
      var response = await http.get(_url,);
      var bytes = response.bodyBytes;

plateaukao

Isolate isolate;

void startRealAsyncTask() async {
  // need a ReceivePort to receive messages.
  ReceivePort receivePort= ReceivePort(); 
  isolate = await Isolate.spawn(heavyTask, receivePort.sendPort);
  receivePort.listen((data) {
    stdout.write('RECEIVE: ' + data + ', ');
  });
}

plateaukao

static Image processImage(Image srcImage) {
  return srcImage.replaceColor(Colors.white, Colors.transparent);
}

Image _getTransparentBackgroundImage(Image srcImage) async {
  Image resultImage = await compute(processImage, srcImage);
  return resultImae;
}

plateaukao

@startuml
alt case: no local cache
    autonumber "<font color=red><b>[0]"
    CalliImage -> http: get (image file)
    http --> CalliImage: image file with white background
    CalliImage -> ImageProcessing: compute(removeWhiteBackground, bytes)
    ImageProcessing --> CalliImage: processed image
    CalliImage -> CalliImage: save file to local storage
    CalliImage -> CalliImage: in build(), Image.memory(processed image)
else case: local cache exists

plateaukao

import 'package:oauth1/oauth1.dart' as oauth1;

const String FLICKR_API_URL_OAUTH_BASE="https://www.flickr.com/services/oauth";
const String FLICKR_API_URL_REQUEST_TOKEN ="$FLICKR_API_URL_OAUTH_BASE/request_token";
const String FLICKR_API_URL_AUTHORIZE="$FLICKR_API_URL_OAUTH_BASE/authorize";
const String FLICKR_API_URL_ACCESS_TOKEN="$FLICKR_API_URL_OAUTH_BASE/access_token";

class FlickrApiClient {
  
  final platform = new oauth1.Platform(

plateaukao

import 'package:url_launcher/url_launcher.dart';

RaisedButton(
  onPressed: () => client.getRequestTokenUrl().then((url){
    launch(url);
    // other handlings.
  }
),

plateaukao

  TextEditingController _textFieldController = TextEditingController();
  
  
  @override
  Widget build(BuildContext context) {
  ...
  ...
          AlertDialog(
            title: Text('Input verification code'),

plateaukao

import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

class _MyHomePageState extends State<MyHomePage> {
    FlutterWebviewPlugin _flutterWebviewPlugin;
  
      @override
  void initState() {
    super.initState();
    ...
    _flutterWebviewPlugin = FlutterWebviewPlugin()..onUrlChanged.listen((url) {