pdfjs-dist/lib/web/pdf_layer_viewer.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2021 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.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.PDFLayerViewer = void 0;

var _base_tree_viewer = require("./base_tree_viewer.js");

class PDFLayerViewer extends _base_tree_viewer.BaseTreeViewer {
  constructor(options) {
    super(options);
    this.l10n = options.l10n;

    this.eventBus._on("resetlayers", this._resetLayers.bind(this));

    this.eventBus._on("togglelayerstree", this._toggleAllTreeItems.bind(this));
  }

  reset() {
    super.reset();
    this._optionalContentConfig = null;
  }

  _dispatchEvent(layersCount) {
    this.eventBus.dispatch("layersloaded", {
      source: this,
      layersCount
    });
  }

  _bindLink(element, {
    groupId,
    input
  }) {
    const setVisibility = () => {
      this._optionalContentConfig.setVisibility(groupId, input.checked);

      this.eventBus.dispatch("optionalcontentconfig", {
        source: this,
        promise: Promise.resolve(this._optionalContentConfig)
      });
    };

    element.onclick = evt => {
      if (evt.target === input) {
        setVisibility();
        return true;
      } else if (evt.target !== element) {
        return true;
      }

      input.checked = !input.checked;
      setVisibility();
      return false;
    };
  }

  async _setNestedName(element, {
    name = null
  }) {
    if (typeof name === "string") {
      element.textContent = this._normalizeTextContent(name);
      return;
    }

    element.textContent = await this.l10n.get("additional_layers");
    element.style.fontStyle = "italic";
  }

  _addToggleButton(div, {
    name = null
  }) {
    super._addToggleButton(div, name === null);
  }

  _toggleAllTreeItems() {
    if (!this._optionalContentConfig) {
      return;
    }

    super._toggleAllTreeItems();
  }

  render({
    optionalContentConfig,
    pdfDocument
  }) {
    if (this._optionalContentConfig) {
      this.reset();
    }

    this._optionalContentConfig = optionalContentConfig || null;
    this._pdfDocument = pdfDocument || null;
    const groups = optionalContentConfig?.getOrder();

    if (!groups) {
      this._dispatchEvent(0);

      return;
    }

    const fragment = document.createDocumentFragment(),
          queue = [{
      parent: fragment,
      groups
    }];
    let layersCount = 0,
        hasAnyNesting = false;

    while (queue.length > 0) {
      const levelData = queue.shift();

      for (const groupId of levelData.groups) {
        const div = document.createElement("div");
        div.className = "treeItem";
        const element = document.createElement("a");
        div.appendChild(element);

        if (typeof groupId === "object") {
          hasAnyNesting = true;

          this._addToggleButton(div, groupId);

          this._setNestedName(element, groupId);

          const itemsDiv = document.createElement("div");
          itemsDiv.className = "treeItems";
          div.appendChild(itemsDiv);
          queue.push({
            parent: itemsDiv,
            groups: groupId.order
          });
        } else {
          const group = optionalContentConfig.getGroup(groupId);
          const input = document.createElement("input");

          this._bindLink(element, {
            groupId,
            input
          });

          input.type = "checkbox";
          input.id = groupId;
          input.checked = group.visible;
          const label = document.createElement("label");
          label.setAttribute("for", groupId);
          label.textContent = this._normalizeTextContent(group.name);
          element.appendChild(input);
          element.appendChild(label);
          layersCount++;
        }

        levelData.parent.appendChild(div);
      }
    }

    this._finishRendering(fragment, layersCount, hasAnyNesting);
  }

  async _resetLayers() {
    if (!this._optionalContentConfig) {
      return;
    }

    const optionalContentConfig = await this._pdfDocument.getOptionalContentConfig();
    this.eventBus.dispatch("optionalcontentconfig", {
      source: this,
      promise: Promise.resolve(optionalContentConfig)
    });
    this.render({
      optionalContentConfig,
      pdfDocument: this._pdfDocument
    });
  }

}

exports.PDFLayerViewer = PDFLayerViewer;