catalog.dart
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/*
* Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
*
* 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 '../document.dart';
import '../format/array.dart';
import '../format/dict.dart';
import '../format/name.dart';
import '../format/num.dart';
import 'annotation.dart';
import 'metadata.dart';
import 'names.dart';
import 'object_dict.dart';
import 'outline.dart';
import 'page_label.dart';
import 'page_list.dart';
/// Pdf Catalog object
class PdfCatalog extends PdfObjectDict {
/// This constructs a Pdf Catalog object
PdfCatalog(
PdfDocument pdfDocument,
this.pdfPageList,
this.pageMode,
) : super(pdfDocument, type: '/Catalog');
/// The pages of the document
final PdfPageList pdfPageList;
/// The outlines of the document
PdfOutline? outlines;
/// The document metadata
PdfMetadata? metadata;
/// The initial page mode
final PdfPageMode pageMode;
/// The anchor names
PdfNames? names;
/// The page labels of the document
PdfPageLabels? pageLabels;
/// These map the page modes just defined to the page modes setting of the Pdf.
static const List<String> _pdfPageModes = <String>[
'/UseNone',
'/UseOutlines',
'/UseThumbs',
'/FullScreen'
];
@override
void prepare() {
super.prepare();
/// the PDF specification version, overrides the header version starting from 1.4
params['/Version'] = PdfName('/${pdfDocument.versionString}');
params['/Pages'] = pdfPageList.ref();
// the Outlines object
if (outlines != null && outlines!.outlines.isNotEmpty) {
params['/Outlines'] = outlines!.ref();
}
if (metadata != null) {
params['/Metadata'] = metadata!.ref();
}
// the Names object
if (names != null) {
params['/Names'] = names!.ref();
}
// the PageLabels object
if (pageLabels != null && pageLabels!.labels.isNotEmpty) {
params['/PageLabels'] = pageLabels!.ref();
}
// the /PageMode setting
params['/PageMode'] = PdfName(_pdfPageModes[pageMode.index]);
if (pdfDocument.sign != null) {
if (pdfDocument.sign!.value.hasMDP) {
params['/Perms'] = PdfDict({
'/DocMDP': pdfDocument.sign!.ref(),
});
}
final dss = PdfDict();
if (pdfDocument.sign!.crl.isNotEmpty) {
dss['/CRLs'] = PdfArray.fromObjects(pdfDocument.sign!.crl);
}
if (pdfDocument.sign!.cert.isNotEmpty) {
dss['/Certs'] = PdfArray.fromObjects(pdfDocument.sign!.cert);
}
if (pdfDocument.sign!.ocsp.isNotEmpty) {
dss['/OCSPs'] = PdfArray.fromObjects(pdfDocument.sign!.ocsp);
}
if (dss.values.isNotEmpty) {
params['/DSS'] = dss;
}
}
final widgets = <PdfAnnot>[];
for (final page in pdfDocument.pdfPageList.pages) {
for (final annot in page.annotations) {
if (annot.annot.subtype == '/Widget') {
widgets.add(annot);
}
}
}
if (widgets.isNotEmpty) {
final acroForm = (params['/AcroForm'] ??= PdfDict()) as PdfDict;
acroForm['/SigFlags'] = PdfNum(pdfDocument.sign?.flagsValue ?? 0) |
(acroForm['/SigFlags'] as PdfNum? ?? const PdfNum(0));
final fields = (acroForm['/Fields'] ??= PdfArray()) as PdfArray;
for (final w in widgets) {
fields.add(w.ref());
}
}
}
}