356 lines
15 KiB
Dart
356 lines
15 KiB
Dart
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import 'dart:convert';
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:archive/archive.dart';
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import 'package:path/path.dart' as p;
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import 'package:pdf/pdf.dart';
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import 'package:pdf/widgets.dart' as pw;
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enum ExportFormat { pdf, pptx }
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extension ExportFormatExtension on ExportFormat {
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String get label {
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switch (this) {
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case ExportFormat.pdf:
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return 'PDF';
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case ExportFormat.pptx:
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return 'PowerPoint (PPTX)';
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}
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}
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String get extension {
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switch (this) {
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case ExportFormat.pdf:
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return '.pdf';
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case ExportFormat.pptx:
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return '.pptx';
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}
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}
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}
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class ExportResult {
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final bool success;
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final String? outputPath;
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final String? error;
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const ExportResult._({required this.success, this.outputPath, this.error});
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factory ExportResult.ok(String path) =>
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ExportResult._(success: true, outputPath: path);
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factory ExportResult.fail(String error) =>
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ExportResult._(success: false, error: error);
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}
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/// Builds PDF and PPTX files from pre-rendered slide images (WYSIWYG export).
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/// Slides are expected to be 16:9 PNG bytes (see [SlideRasterizer]).
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class ExportService {
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// 16:9 widescreen slide size in EMU (English Metric Units): 13.333" x 7.5".
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static const int _slideWidthEmu = 12192000;
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static const int _slideHeightEmu = 6858000;
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/// Write [images] to a file derived from [deckPath] (same folder/base name)
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/// in the requested [format].
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Future<ExportResult> export(
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String deckPath,
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ExportFormat format,
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List<Uint8List> images,
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) async {
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if (images.isEmpty) {
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return ExportResult.fail('Geen slides om te exporteren.');
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}
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final outputPath = '${p.withoutExtension(deckPath)}${format.extension}';
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try {
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final Uint8List bytes;
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switch (format) {
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case ExportFormat.pdf:
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bytes = await _buildPdf(images);
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case ExportFormat.pptx:
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bytes = _buildPptx(images);
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}
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await File(outputPath).writeAsBytes(bytes, flush: true);
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return ExportResult.ok(outputPath);
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} catch (e) {
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return ExportResult.fail('Export fout: $e');
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}
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}
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// ── PDF ───────────────────────────────────────────────────────────────────
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Future<Uint8List> _buildPdf(List<Uint8List> images) async {
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final doc = pw.Document();
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// Page size in points; only the ratio matters for a full-bleed image.
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const format = PdfPageFormat(1280, 720, marginAll: 0);
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for (final png in images) {
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final image = pw.MemoryImage(png);
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doc.addPage(
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pw.Page(
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pageFormat: format,
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build: (_) => pw.Image(image, fit: pw.BoxFit.fill),
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),
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);
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}
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return doc.save();
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}
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// ── PPTX (Office Open XML) ─────────────────────────────────────────────────
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Uint8List _buildPptx(List<Uint8List> images) {
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final archive = Archive();
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void addText(String name, String content) {
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final data = utf8Bytes(content);
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archive.add(ArchiveFile(name, data.length, data));
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}
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final slideCount = images.length;
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addText('[Content_Types].xml', _contentTypes(slideCount));
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addText('_rels/.rels', _rootRels());
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addText('ppt/presentation.xml', _presentationXml(slideCount));
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addText('ppt/_rels/presentation.xml.rels', _presentationRels(slideCount));
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addText('ppt/presProps.xml', _presProps());
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addText('ppt/theme/theme1.xml', _theme1());
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addText('ppt/slideMasters/slideMaster1.xml', _slideMaster());
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addText('ppt/slideMasters/_rels/slideMaster1.xml.rels', _slideMasterRels());
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addText('ppt/slideLayouts/slideLayout1.xml', _slideLayout());
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addText('ppt/slideLayouts/_rels/slideLayout1.xml.rels', _slideLayoutRels());
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for (var i = 0; i < slideCount; i++) {
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final n = i + 1;
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addText('ppt/slides/slide$n.xml', _slideXml());
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addText('ppt/slides/_rels/slide$n.xml.rels', _slideRels(n));
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final png = images[i];
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archive.add(ArchiveFile('ppt/media/image$n.png', png.length, png));
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}
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return ZipEncoder().encodeBytes(archive);
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}
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static List<int> utf8Bytes(String s) => utf8.encode(s);
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String _contentTypes(int count) {
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final overrides = StringBuffer();
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for (var i = 1; i <= count; i++) {
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overrides.write(
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'<Override PartName="/ppt/slides/slide$i.xml" '
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'ContentType="application/vnd.openxmlformats-officedocument.presentationml.slide+xml"/>',
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);
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}
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">'
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'<Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>'
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'<Default Extension="xml" ContentType="application/xml"/>'
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'<Default Extension="png" ContentType="image/png"/>'
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'<Override PartName="/ppt/presentation.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.presentation.main+xml"/>'
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'<Override PartName="/ppt/presProps.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.presProps+xml"/>'
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'<Override PartName="/ppt/slideMasters/slideMaster1.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.slideMaster+xml"/>'
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'<Override PartName="/ppt/slideLayouts/slideLayout1.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.slideLayout+xml"/>'
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'<Override PartName="/ppt/theme/theme1.xml" ContentType="application/vnd.openxmlformats-officedocument.theme+xml"/>'
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'$overrides'
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'</Types>';
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}
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String _rootRels() {
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">'
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'<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="ppt/presentation.xml"/>'
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'</Relationships>';
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}
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String _presentationXml(int count) {
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final sldIds = StringBuffer();
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for (var i = 0; i < count; i++) {
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// Slide relationship ids start at rId2 (rId1 = master).
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sldIds.write('<p:sldId id="${256 + i}" r:id="rId${i + 2}"/>');
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}
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<p:presentation xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" '
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'xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" '
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'xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main">'
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'<p:sldMasterIdLst><p:sldMasterId id="2147483648" r:id="rId1"/></p:sldMasterIdLst>'
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'<p:sldIdLst>$sldIds</p:sldIdLst>'
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'<p:sldSz cx="$_slideWidthEmu" cy="$_slideHeightEmu" type="screen16x9"/>'
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'<p:notesSz cx="6858000" cy="9144000"/>'
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'</p:presentation>';
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}
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String _presentationRels(int count) {
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final rels = StringBuffer();
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rels.write(
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'<Relationship Id="rId1" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideMaster" '
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'Target="slideMasters/slideMaster1.xml"/>',
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);
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for (var i = 0; i < count; i++) {
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final n = i + 1;
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rels.write(
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'<Relationship Id="rId${i + 2}" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide" '
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'Target="slides/slide$n.xml"/>',
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);
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}
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final presPropsId = 'rId${count + 2}';
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final themeId = 'rId${count + 3}';
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rels.write(
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'<Relationship Id="$presPropsId" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/presProps" '
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'Target="presProps.xml"/>',
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);
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rels.write(
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'<Relationship Id="$themeId" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme" '
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'Target="theme/theme1.xml"/>',
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);
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">'
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'$rels'
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'</Relationships>';
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}
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String _presProps() {
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<p:presentationPr xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" '
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'xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" '
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'xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main"/>';
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}
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String _slideMaster() {
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<p:sldMaster xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" '
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'xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" '
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'xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main">'
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'<p:cSld>'
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'<p:bg><p:bgRef idx="1001"><a:schemeClr val="bg1"/></p:bgRef></p:bg>'
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'${_emptySpTree()}'
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'</p:cSld>'
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'<p:clrMap bg1="lt1" tx1="dk1" bg2="lt2" tx2="dk2" accent1="accent1" '
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'accent2="accent2" accent3="accent3" accent4="accent4" accent5="accent5" '
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'accent6="accent6" hlink="hlink" folHlink="folHlink"/>'
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'<p:sldLayoutIdLst><p:sldLayoutId id="2147483649" r:id="rId1"/></p:sldLayoutIdLst>'
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'<p:txStyles><p:titleStyle/><p:bodyStyle/><p:otherStyle/></p:txStyles>'
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'</p:sldMaster>';
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}
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String _slideMasterRels() {
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">'
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'<Relationship Id="rId1" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideLayout" '
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'Target="../slideLayouts/slideLayout1.xml"/>'
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'<Relationship Id="rId2" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme" '
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'Target="../theme/theme1.xml"/>'
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'</Relationships>';
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}
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String _slideLayout() {
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<p:sldLayout xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" '
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'xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" '
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'xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" '
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'type="blank" preserve="1">'
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'<p:cSld name="Leeg">${_emptySpTree()}</p:cSld>'
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'<p:clrMapOvr><a:masterClrMapping/></p:clrMapOvr>'
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'</p:sldLayout>';
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}
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String _slideLayoutRels() {
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">'
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'<Relationship Id="rId1" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideMaster" '
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'Target="../slideMasters/slideMaster1.xml"/>'
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'</Relationships>';
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}
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String _slideXml() {
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<p:sld xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" '
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'xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" '
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'xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main">'
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'<p:cSld><p:spTree>'
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'<p:nvGrpSpPr><p:cNvPr id="1" name=""/><p:cNvGrpSpPr/><p:nvPr/></p:nvGrpSpPr>'
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'<p:grpSpPr><a:xfrm><a:off x="0" y="0"/><a:ext cx="0" cy="0"/>'
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'<a:chOff x="0" y="0"/><a:chExt cx="0" cy="0"/></a:xfrm></p:grpSpPr>'
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'<p:pic>'
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'<p:nvPicPr><p:cNvPr id="2" name="Slide"/>'
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'<p:cNvPicPr><a:picLocks noChangeAspect="1"/></p:cNvPicPr><p:nvPr/></p:nvPicPr>'
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'<p:blipFill><a:blip r:embed="rId2"/><a:stretch><a:fillRect/></a:stretch></p:blipFill>'
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'<p:spPr><a:xfrm><a:off x="0" y="0"/>'
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'<a:ext cx="$_slideWidthEmu" cy="$_slideHeightEmu"/></a:xfrm>'
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'<a:prstGeom prst="rect"><a:avLst/></a:prstGeom></p:spPr>'
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'</p:pic>'
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'</p:spTree></p:cSld>'
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'<p:clrMapOvr><a:masterClrMapping/></p:clrMapOvr>'
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'</p:sld>';
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}
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String _slideRels(int n) {
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return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
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'<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">'
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'<Relationship Id="rId1" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideLayout" '
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'Target="../slideLayouts/slideLayout1.xml"/>'
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'<Relationship Id="rId2" '
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'Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image" '
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'Target="../media/image$n.png"/>'
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'</Relationships>';
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}
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String _emptySpTree() {
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return '<p:spTree>'
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'<p:nvGrpSpPr><p:cNvPr id="1" name=""/><p:cNvGrpSpPr/><p:nvPr/></p:nvGrpSpPr>'
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'<p:grpSpPr><a:xfrm><a:off x="0" y="0"/><a:ext cx="0" cy="0"/>'
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'<a:chOff x="0" y="0"/><a:chExt cx="0" cy="0"/></a:xfrm></p:grpSpPr>'
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'</p:spTree>';
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|
}
|
||
|
|
|
||
|
|
String _theme1() {
|
||
|
|
return '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'
|
||
|
|
'<a:theme xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" name="Office">'
|
||
|
|
'<a:themeElements>'
|
||
|
|
'<a:clrScheme name="Office">'
|
||
|
|
'<a:dk1><a:sysClr val="windowText" lastClr="000000"/></a:dk1>'
|
||
|
|
'<a:lt1><a:sysClr val="window" lastClr="FFFFFF"/></a:lt1>'
|
||
|
|
'<a:dk2><a:srgbClr val="44546A"/></a:dk2>'
|
||
|
|
'<a:lt2><a:srgbClr val="E7E6E6"/></a:lt2>'
|
||
|
|
'<a:accent1><a:srgbClr val="4472C4"/></a:accent1>'
|
||
|
|
'<a:accent2><a:srgbClr val="ED7D31"/></a:accent2>'
|
||
|
|
'<a:accent3><a:srgbClr val="A5A5A5"/></a:accent3>'
|
||
|
|
'<a:accent4><a:srgbClr val="FFC000"/></a:accent4>'
|
||
|
|
'<a:accent5><a:srgbClr val="5B9BD5"/></a:accent5>'
|
||
|
|
'<a:accent6><a:srgbClr val="70AD47"/></a:accent6>'
|
||
|
|
'<a:hlink><a:srgbClr val="0563C1"/></a:hlink>'
|
||
|
|
'<a:folHlink><a:srgbClr val="954F72"/></a:folHlink>'
|
||
|
|
'</a:clrScheme>'
|
||
|
|
'<a:fontScheme name="Office">'
|
||
|
|
'<a:majorFont><a:latin typeface="Calibri Light"/><a:ea typeface=""/><a:cs typeface=""/></a:majorFont>'
|
||
|
|
'<a:minorFont><a:latin typeface="Calibri"/><a:ea typeface=""/><a:cs typeface=""/></a:minorFont>'
|
||
|
|
'</a:fontScheme>'
|
||
|
|
'<a:fmtScheme name="Office">'
|
||
|
|
'<a:fillStyleLst>'
|
||
|
|
'<a:solidFill><a:schemeClr val="phClr"/></a:solidFill>'
|
||
|
|
'<a:solidFill><a:schemeClr val="phClr"/></a:solidFill>'
|
||
|
|
'<a:solidFill><a:schemeClr val="phClr"/></a:solidFill>'
|
||
|
|
'</a:fillStyleLst>'
|
||
|
|
'<a:lnStyleLst>'
|
||
|
|
'<a:ln w="6350" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill><a:prstDash val="solid"/></a:ln>'
|
||
|
|
'<a:ln w="12700" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill><a:prstDash val="solid"/></a:ln>'
|
||
|
|
'<a:ln w="19050" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill><a:prstDash val="solid"/></a:ln>'
|
||
|
|
'</a:lnStyleLst>'
|
||
|
|
'<a:effectStyleLst>'
|
||
|
|
'<a:effectStyle><a:effectLst/></a:effectStyle>'
|
||
|
|
'<a:effectStyle><a:effectLst/></a:effectStyle>'
|
||
|
|
'<a:effectStyle><a:effectLst/></a:effectStyle>'
|
||
|
|
'</a:effectStyleLst>'
|
||
|
|
'<a:bgFillStyleLst>'
|
||
|
|
'<a:solidFill><a:schemeClr val="phClr"/></a:solidFill>'
|
||
|
|
'<a:solidFill><a:schemeClr val="phClr"/></a:solidFill>'
|
||
|
|
'<a:solidFill><a:schemeClr val="phClr"/></a:solidFill>'
|
||
|
|
'</a:bgFillStyleLst>'
|
||
|
|
'</a:fmtScheme>'
|
||
|
|
'</a:themeElements>'
|
||
|
|
'</a:theme>';
|
||
|
|
}
|
||
|
|
}
|