Function createFormField

src/document/forms/fields/factory.ts:25–63

(
  dict: PdfDict,
  ref: PdfRef | null,
  registry: ObjectRegistry,
  acroForm: AcroFormLike,
  name: string,
)

 * Non-terminal fields (containers) are created directly in AcroForm.
 */
export function createFormField(
  dict: PdfDict,
  ref: PdfRef | null,
  registry: ObjectRegistry,
  acroForm: AcroFormLike,
  name: string,
): TerminalField {
  const ft = getInheritableFieldName(dict, "FT", registry);
  const ff = getInheritableFieldNumber(dict, "Ff", registry);

  switch (ft) {
    case "Tx":
      return new TextField(dict, ref, registry, acroForm, name);

    case "Btn":
      if (ff & FieldFlags.PUSHBUTTON) {
        return new ButtonField(dict, ref, registry, acroForm, name);
      }

      if (ff & FieldFlags.RADIO) {
        return new RadioField(dict, ref, registry, acroForm, name);
      }

      return new CheckboxField(dict, ref, registry, acroForm, name);

    case "Ch":
      if (ff & FieldFlags.COMBO) {
        return new DropdownField(dict, ref, registry, acroForm, name);
      }

      return new ListBoxField(dict, ref, registry, acroForm, name);

    case "Sig":
      return new SignatureField(dict, ref, registry, acroForm, name);

    default:
      return new UnknownField(dict, ref, registry, acroForm, name);
  }
}

/**
 * Get inheritable name value from field hierarchy.