kmpdfkit_demo/lib/widgets/util/signature_image_util.dart

import 'dart:async';
import 'dart:io';
import 'dart:typed_data';
import 'dart:ui' as ui;
import 'dart:ui';

import 'package:kmpdfkit_demo/widgets/function/attrwidget/attr_signature_list_widget.dart';
import 'package:path_provider/path_provider.dart';

///  signature_image_util.dart
///
///  Copyright © 2014-2023 PDF Technologies, Inc. All Rights Reserved.
///
///  THIS SOURCE CODE AND ANY ACCOMPANYING DOCUMENTATION ARE PROTECTED BY INTERNATIONAL COPYRIGHT LAW
///  AND MAY NOT BE RESOLD OR REDISTRIBUTED. USAGE IS BOUND TO THE ComPDFKit LICENSE AGREEMENT.
///  UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS SUBJECT TO CIVIL AND CRIMINAL PENALTIES.
///  This notice may not be removed from this file.

class SignatureImageUtil {
  static Future<String?> saveByteDataImage(ui.Image? image) async {
    ByteData? byteData = await image?.toByteData(format: ImageByteFormat.png);
    final pngBytes = byteData?.buffer.asUint8List();

    // 写入文件
    final directory = await getApplicationDocumentsDirectory();
    Directory folder = Directory('${directory.path}/pdfview/signature/');
    folder.createSync(recursive: true);
    String path =
        '${folder.path}/signature_image_${DateTime.now().millisecond}.png';
    final file = File(path);
    await file.writeAsBytes(pngBytes!.toList());
    return file.existsSync() ? path : null;
  }

  static Future<List<SignatureImageBean>> signatureImages() async {
    final directory = await getApplicationDocumentsDirectory();
    String path = '${directory.path}/pdfview/signature/';
    final folder = Directory(path);
    if (!await folder.exists()) {
      return [];
    }
    final fileList = await folder.list().toList();
    final files = <SignatureImageBean>[];
    for (final entity in fileList) {
      if (entity is File) {
        files.add(SignatureImageBean(File(entity.path), false));
      }
    }
    return files;
  }

  static void delete(List<SignatureImageBean> list) async {
    for (var value in list) {
      value.file.delete();
    }
  }
}