pdfjs-dist/lib/display/xfa_layer.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.XfaLayer = void 0;

class XfaLayer {
  static setupStorage(html, fieldId, element, storage) {
    const storedData = storage.getValue(fieldId, {
      value: null
    });

    switch (element.name) {
      case "textarea":
        html.textContent = storedData.value !== null ? storedData.value : "";
        html.addEventListener("input", event => {
          storage.setValue(fieldId, {
            value: event.target.value
          });
        });
        break;

      case "input":
        if (storedData.value !== null) {
          html.setAttribute("value", storedData.value);
        }

        if (element.attributes.type === "radio") {
          html.addEventListener("change", event => {
            const {
              target
            } = event;

            for (const radio of document.getElementsByName(target.name)) {
              if (radio !== target) {
                const id = radio.id;
                storage.setValue(id.split("-")[0], {
                  value: false
                });
              }
            }

            storage.setValue(fieldId, {
              value: target.checked
            });
          });
        } else {
          html.addEventListener("input", event => {
            storage.setValue(fieldId, {
              value: event.target.value
            });
          });
        }

        break;

      case "select":
        if (storedData.value !== null) {
          for (const option of element.children) {
            if (option.attributes.value === storedData.value) {
              option.attributes.selected = true;
            }
          }
        }

        html.addEventListener("input", event => {
          const options = event.target.options;
          const value = options.selectedIndex === -1 ? null : options[options.selectedIndex].value;
          storage.setValue(fieldId, {
            value
          });
        });
        break;
    }
  }

  static setAttributes(html, element, storage) {
    const {
      attributes
    } = element;

    for (const [key, value] of Object.entries(attributes)) {
      if (value === null || value === undefined || key === "fieldId") {
        continue;
      }

      if (key !== "style") {
        if (key === "textContent") {
          html.textContent = value;
        } else {
          html.setAttribute(key, value);
        }
      } else {
        Object.assign(html.style, value);
      }
    }

    if (storage && attributes.fieldId !== undefined) {
      this.setupStorage(html, attributes.fieldId, element, storage);
    }
  }

  static render(parameters) {
    const storage = parameters.annotationStorage;
    const root = parameters.xfa;
    const rootHtml = document.createElement(root.name);

    if (root.attributes) {
      this.setAttributes(rootHtml, root);
    }

    const stack = [[root, -1, rootHtml]];
    const rootDiv = parameters.div;
    rootDiv.appendChild(rootHtml);
    const coeffs = parameters.viewport.transform.join(",");
    rootDiv.style.transform = `matrix(${coeffs})`;
    rootDiv.setAttribute("class", "xfaLayer xfaFont");

    while (stack.length > 0) {
      const [parent, i, html] = stack[stack.length - 1];

      if (i + 1 === parent.children.length) {
        stack.pop();
        continue;
      }

      const child = parent.children[++stack[stack.length - 1][1]];

      if (child === null) {
        continue;
      }

      const {
        name
      } = child;

      if (name === "#text") {
        html.appendChild(document.createTextNode(child.value));
        continue;
      }

      const childHtml = document.createElement(name);
      html.appendChild(childHtml);

      if (child.attributes) {
        this.setAttributes(childHtml, child, storage);
      }

      if (child.children && child.children.length > 0) {
        stack.push([child, -1, childHtml]);
      } else if (child.value) {
        childHtml.appendChild(document.createTextNode(child.value));
      }
    }
  }

  static update(parameters) {
    const transform = `matrix(${parameters.viewport.transform.join(",")})`;
    parameters.div.style.transform = transform;
    parameters.div.hidden = false;
  }

}

exports.XfaLayer = XfaLayer;