pdf.js/web/annotation_layer_builder.js

/* Copyright 2014 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { AnnotationLayer } from 'pdfjs-lib';
import { NullL10n } from './ui_utils';
import { SimpleLinkService } from './pdf_link_service';

/**
 * @typedef {Object} AnnotationLayerBuilderOptions
 * @property {HTMLDivElement} pageDiv
 * @property {PDFPage} pdfPage
 * @property {string} [imageResourcesPath] - Path for image resources, mainly
 *   for annotation icons. Include trailing slash.
 * @property {boolean} renderInteractiveForms
 * @property {IPDFLinkService} linkService
 * @property {DownloadManager} downloadManager
 * @property {IL10n} l10n - Localization service.
 */

class AnnotationLayerBuilder {
  /**
   * @param {AnnotationLayerBuilderOptions} options
   */
  constructor({ pageDiv, pdfPage, linkService, downloadManager,
                imageResourcesPath = '', renderInteractiveForms = false,
                l10n = NullL10n, }) {
    this.pageDiv = pageDiv;
    this.pdfPage = pdfPage;
    this.linkService = linkService;
    this.downloadManager = downloadManager;
    this.imageResourcesPath = imageResourcesPath;
    this.renderInteractiveForms = renderInteractiveForms;
    this.l10n = l10n;

    this.div = null;
    this._cancelled = false;
  }

  /**
   * @param {PageViewport} viewport
   * @param {string} intent (default value is 'display')
   */
  render(viewport, intent = 'display') {
    this.pdfPage.getAnnotations({ intent, }).then((annotations) => {
      if (this._cancelled) {
        return;
      }

      let parameters = {
        viewport: viewport.clone({ dontFlip: true, }),
        div: this.div,
        annotations,
        page: this.pdfPage,
        imageResourcesPath: this.imageResourcesPath,
        renderInteractiveForms: this.renderInteractiveForms,
        linkService: this.linkService,
        downloadManager: this.downloadManager,
      };

      if (this.div) {
        // If an annotationLayer already exists, refresh its children's
        // transformation matrices.
        AnnotationLayer.update(parameters);
      } else {
        // Create an annotation layer div and render the annotations
        // if there is at least one annotation.
        if (annotations.length === 0) {
          return;
        }
        this.div = document.createElement('div');
        this.div.className = 'annotationLayer';
        this.pageDiv.appendChild(this.div);
        parameters.div = this.div;

        AnnotationLayer.render(parameters);
        this.l10n.translate(this.div);
      }
    });
  }

  cancel() {
    this._cancelled = true;
  }

  hide() {
    if (!this.div) {
      return;
    }
    this.div.setAttribute('hidden', 'true');
  }
}

/**
 * @implements IPDFAnnotationLayerFactory
 */
class DefaultAnnotationLayerFactory {
  /**
   * @param {HTMLDivElement} pageDiv
   * @param {PDFPage} pdfPage
   * @param {string} [imageResourcesPath] - Path for image resources, mainly
   *   for annotation icons. Include trailing slash.
   * @param {boolean} renderInteractiveForms
   * @param {IL10n} l10n
   * @returns {AnnotationLayerBuilder}
   */
  createAnnotationLayerBuilder(pageDiv, pdfPage, imageResourcesPath = '',
                               renderInteractiveForms = false,
                               l10n = NullL10n) {
    return new AnnotationLayerBuilder({
      pageDiv,
      pdfPage,
      imageResourcesPath,
      renderInteractiveForms,
      linkService: new SimpleLinkService(),
      l10n,
    });
  }
}

export {
  AnnotationLayerBuilder,
  DefaultAnnotationLayerFactory,
};