@pdfme/pdf-lib
Version:
Create and modify PDF files with JavaScript
86 lines • 3.12 kB
JavaScript
import PDFString from '../objects/PDFString';
import PDFHexString from '../objects/PDFHexString';
import PDFArray from '../objects/PDFArray';
import PDFName from '../objects/PDFName';
import PDFAcroTerminal from './PDFAcroTerminal';
import { IndexOutOfBoundsError } from '../errors';
class PDFAcroButton extends PDFAcroTerminal {
Opt() {
return this.dict.lookupMaybe(PDFName.of('Opt'), PDFString, PDFHexString, PDFArray);
}
setOpt(opt) {
this.dict.set(PDFName.of('Opt'), this.dict.context.obj(opt));
}
getExportValues() {
const opt = this.Opt();
if (!opt)
return undefined;
if (opt instanceof PDFString || opt instanceof PDFHexString) {
return [opt];
}
const values = [];
for (let idx = 0, len = opt.size(); idx < len; idx++) {
const value = opt.lookup(idx);
if (value instanceof PDFString || value instanceof PDFHexString) {
values.push(value);
}
}
return values;
}
removeExportValue(idx) {
const opt = this.Opt();
if (!opt)
return;
if (opt instanceof PDFString || opt instanceof PDFHexString) {
if (idx !== 0)
throw new IndexOutOfBoundsError(idx, 0, 0);
this.setOpt([]);
}
else {
if (idx < 0 || idx > opt.size()) {
throw new IndexOutOfBoundsError(idx, 0, opt.size());
}
opt.remove(idx);
}
}
// Enforce use use of /Opt even if it isn't strictly necessary
normalizeExportValues() {
const exportValues = this.getExportValues() ?? [];
const Opt = [];
const widgets = this.getWidgets();
for (let idx = 0, len = widgets.length; idx < len; idx++) {
const widget = widgets[idx];
const exportVal = exportValues[idx] ?? PDFHexString.fromText(widget.getOnValue()?.decodeText() ?? '');
Opt.push(exportVal);
}
this.setOpt(Opt);
}
/**
* Reuses existing opt if one exists with the same value (assuming
* `useExistingIdx` is `true`). Returns index of existing (or new) opt.
*/
addOpt(opt, useExistingOptIdx) {
this.normalizeExportValues();
const optText = opt.decodeText();
let existingIdx;
if (useExistingOptIdx) {
const exportValues = this.getExportValues() ?? [];
for (let idx = 0, len = exportValues.length; idx < len; idx++) {
const exportVal = exportValues[idx];
if (exportVal.decodeText() === optText)
existingIdx = idx;
}
}
const Opt = this.Opt();
Opt.push(opt);
return existingIdx ?? Opt.size() - 1;
}
addWidgetWithOpt(widget, opt, useExistingOptIdx) {
const optIdx = this.addOpt(opt, useExistingOptIdx);
const apStateValue = PDFName.of(String(optIdx));
this.addWidget(widget);
return apStateValue;
}
}
export default PDFAcroButton;
//# sourceMappingURL=PDFAcroButton.js.map