kmpdfkit_demo/lib/core/document/cpdf_document.dart

import 'dart:ui' as ui;
import 'package:flutter/services.dart';

import 'cpdf_document_error.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 CPDFDocument {
  int _viewId = 0;

  late final MethodChannel _methodChannel;

  CPDFDocument(this._viewId) {
    _methodChannel =
        MethodChannel('com.compdfkit.flutter.pdfviewer.document.$_viewId');
  }

  CPDFDocument.create() : this(1000);

  Future<PDFDocumentError> open(String document, {String password = ''}) async {
    int errorCode = await _methodChannel.invokeMethod('openPDF',{
      'document' : document,
      'password' : password
    });
    return PDFDocumentError.values.firstWhere((element) => element.index == errorCode);
  }

  /// Get the number of pages in a pdf file
  Future<int> getPageCount() async {
    return await _methodChannel.invokeMethod('getPageCount');
  }

  /// Get the page size of the specified page number in the pdf file
  Future<List<double>> getPageSize(int pageIndex) async {
    Map<dynamic, dynamic> map =
        await _methodChannel.invokeMethod('getPageSize', pageIndex);
    return Future(() => [map['width'], map['height']]);
  }

  /// Render the page with the specified page number and return the image
  Future<Uint8List> renderPageAtIndex(
      int pageIndex, int width, int height) async {
    Uint8List imageData = await _methodChannel.invokeMethod('renderPageAtIndex',
        {'pageIndex': pageIndex, 'width': width, 'height': height});
    return imageData;
  }
}