kmpdfkit_demo/lib/widgets/util/stamp_util.dart

import 'dart:convert';
import 'dart:io';
import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:kmpdfkit_demo/widgets/models/text_stamp_bean.dart';
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';

import 'image_util.dart';

///  stamp_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 StampUtil {
  static Future<bool> saveTextStampData(
      GlobalKey globalKey, TextStampBean bean) async {
    RenderRepaintBoundary? boundary =
        globalKey.currentContext?.findRenderObject() as RenderRepaintBoundary?;
    ui.Image? image = await boundary?.toImage(pixelRatio: 1.0);
    final directory = await getApplicationDocumentsDirectory();
    int millisecond = DateTime.now().microsecondsSinceEpoch;
    String directoryPath = '${directory.path}/pdfview/stamp/$millisecond';
    Directory folder = Directory(directoryPath);
    folder.createSync(recursive: true);
    Future<String?> path = ImageUtil.saveByteDataImage(
        image, folder.path, 'text_stamp_preview_$millisecond.png');
    File file = File('${folder.path}/data.json');
    File resultFile = await file.writeAsString(jsonEncode(bean.toJson()));
    return path != null && resultFile.existsSync();
  }

  static Future<List<TextStampBean>> getCustomTextStampList() async {
    final directory = await getApplicationDocumentsDirectory();
    String path = '${directory.path}/pdfview/stamp/';
    final folder = Directory(path);
    if (!await folder.exists()) {
      return [];
    }
    final fileList = await folder.list().toList();
    final files = <TextStampBean>[];
    for (final entity in fileList) {
      if (entity is Directory) {
        final stampFolder = Directory(entity.path);
        final list = await stampFolder.list().toList();
        final jsonFileEntity =
            list.firstWhere((element) => basename(element.path) == 'data.json');
        final previewImageFileEntity = list.firstWhere((element) {
          String name = basename(element.path);
          String previewImageName = 'text_stamp_preview_${basename(stampFolder.path)}.png';
          return name == previewImageName;
        });
        if (await jsonFileEntity.exists() &&
            await previewImageFileEntity.exists()) {
          File jsonFile = File(jsonFileEntity.path);
          File previewImageFile = File(previewImageFileEntity.path);
          files.add(
              TextStampBean.fromJson(jsonDecode(await jsonFile.readAsString()))
                ..previewImagePath = previewImageFile.path);
        }
      }
    }
    return files;
  }

  static Future<void> deleteTextStamp(List<TextStampBean> list) async {

    for (var value in list) {
      if (value.previewImagePath != null) {
        File file = File(value.previewImagePath!);
        await file.parent.delete(recursive: true);
      }
    }
  }


}