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Edit File: draw_layer_builder.js

/* Copyright 2022 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 { DrawLayer } from "pdfjs-lib";

/**
 * @typedef {Object} DrawLayerBuilderOptions
 * @property {number} pageIndex
 */

/**
 * @typedef {Object} DrawLayerBuilderRenderOptions
 * @property {string} [intent] - The default value is "display".
 */

class DrawLayerBuilder {
  #drawLayer = null;

/**
   * @param {DrawLayerBuilderOptions} options
   */
  constructor(options) {
    this.pageIndex = options.pageIndex;
  }

/**
   * @param {DrawLayerBuilderRenderOptions} options
   * @returns {Promise<void>}
   */
  async render({ intent = "display" }) {
    if (intent !== "display" || this.#drawLayer || this._cancelled) {
      return;
    }
    this.#drawLayer = new DrawLayer({
      pageIndex: this.pageIndex,
    });
  }

cancel() {
    this._cancelled = true;

if (!this.#drawLayer) {
      return;
    }
    this.#drawLayer.destroy();
    this.#drawLayer = null;
  }

setParent(parent) {
    this.#drawLayer?.setParent(parent);
  }

getDrawLayer() {
    return this.#drawLayer;
  }
}

export { DrawLayerBuilder };