flutter_drawing_board 0.2.0

A Flutter package of drawing board, provides basic drawing tools, canvas operations, and image data acquisition.

example/lib/main.dart

import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_drawing_board/flutter_drawing_board.dart';

void main() {
  FlutterError.onError = (FlutterErrorDetails details) {
    FlutterError.dumpErrorToConsole(details);
    if (kReleaseMode) {
      exit(1);
    }
  };

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Drawing Test',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {
  ///绘制控制器
  final DrawingController _drawingController = DrawingController(
    ///配置
    config: DrawConfig(
      paintType: PaintType.simpleLine,
      color: Colors.red,
      thickness: 2.0,
      angle: 0,
      text: '输入文本',
    ),
  );

  @override
  void dispose() {
    _drawingController.dispose();
    super.dispose();
  }

  ///获取画板数据 `getImageData()`
  Future<void> _getImageData() async {
    final Uint8List? data =
        (await _drawingController.getImageData())?.buffer.asUint8List();
    if (data == null) {
      print('获取图片数据失败');
      return;
    }
    showDialog<void>(
      context: context,
      builder: (BuildContext c) {
        return Material(
          color: Colors.transparent,
          child:
              InkWell(onTap: () => Navigator.pop(c), child: Image.memory(data)),
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      resizeToAvoidBottomInset: false,
      backgroundColor: Colors.grey,
      appBar: AppBar(
        title: const Text('Drawing Test'),
        systemOverlayStyle: SystemUiOverlayStyle.light,
        actions: <Widget>[
          IconButton(icon: const Icon(Icons.check), onPressed: _getImageData)
        ],
      ),
      body: Column(
        children: <Widget>[
          Expanded(
            child: DrawingBoard(
              controller: _drawingController,
              background:
                  Container(width: 400, height: 400, color: Colors.white),
              showDefaultActions: true,
              showDefaultTools: true,
            ),
          ),
          const Padding(
            padding: EdgeInsets.all(8.0),
            child: SelectableText(
              'https://github.com/xSILENCEx/flutter_drawing_board',
              style: TextStyle(fontSize: 10, color: Colors.white),
            ),
          ),
        ],
      ),
    );
  }
}