flutter_image_crop_widget 1.0.0+4 flutter_image_crop_widget: ^1.0.0+4 copied to clipboard
an image crop widget implemented by flutter. two finger to scale the image and crop part of it.
import 'dart:typed_data';
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_image_crop_widget/flutter_image_crop_widget.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Uint8List? imageData;
@override
void initState() {
super.initState();
rootBundle.load('assets/pasted_image.png').then((data) {
setState(() {
imageData = data.buffer.asUint8List();
});
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: SizedBox.expand(
child: imageData == null
? Placeholder()
: ImageCropWidget.memory(
imageData!,
onUpdate: (originImage, rectInImage) async {
// 这里获取到原图片和裁剪区域
ui.PictureRecorder recorder = ui.PictureRecorder();
final canvas = Canvas(recorder);
canvas.drawImageRect(
originImage,
rectInImage,
Rect.fromLTWH(
0, 0, rectInImage.width, rectInImage.height),
Paint());
final p = recorder.endRecording();
final image = await p.toImage(rectInImage.width.toInt(),
rectInImage.height.toInt());
// final f = File('./hello.jpg');
// final png = i.PngEncoder().encodeImage(i.Image.fromBytes(image.width, image.height,(await image.toByteData())!.buffer.asUint8List()));
// print('path: ${f.absolute}');
// f.writeAsBytes(png);
},
)));
}
}