feat: Introduce PDFService for optimized PDF generation and caching in container and equipment management
This commit is contained in:
ElPoyo
336
em2rp/lib/services/pdf_service.dart
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336
em2rp/lib/services/pdf_service.dart
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import 'dart:typed_data';
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import 'package:flutter/services.dart';
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import 'package:pdf/pdf.dart';
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import 'package:pdf/widgets.dart' as pw;
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import 'package:em2rp/services/qr_code_service.dart';
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/// Formats d'étiquettes QR disponibles
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enum QRLabelFormat { small, medium, large }
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/// Configuration pour la génération de PDF
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class PDFGeneratorConfig {
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final double qrCodeSize;
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final int itemsPerPage;
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final bool withProgress;
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const PDFGeneratorConfig({
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required this.qrCodeSize,
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required this.itemsPerPage,
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this.withProgress = false,
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});
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static const small = PDFGeneratorConfig(
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qrCodeSize: 150,
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itemsPerPage: 20,
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);
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static const medium = PDFGeneratorConfig(
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qrCodeSize: 250,
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itemsPerPage: 6,
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);
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static const large = PDFGeneratorConfig(
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qrCodeSize: 300,
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itemsPerPage: 10,
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);
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static PDFGeneratorConfig fromFormat(QRLabelFormat format) {
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switch (format) {
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case QRLabelFormat.small:
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return small;
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case QRLabelFormat.medium:
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return medium;
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case QRLabelFormat.large:
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return large;
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}
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}
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}
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/// Service UNIQUE et optimisé pour la génération de PDFs avec QR codes
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/// Remplace PDFGeneratorService, ContainerPDFGeneratorService et UnifiedPDFGeneratorService
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class PDFService {
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static Uint8List? _cachedLogoBytes;
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static bool _logoLoadAttempted = false;
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/// Charge le logo en cache une seule fois
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static Future<void> _ensureLogoLoaded() async {
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if (_logoLoadAttempted) return;
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_logoLoadAttempted = true;
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try {
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final logoData = await rootBundle.load('assets/logos/LowQRectangleLogoBlack.png');
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_cachedLogoBytes = logoData.buffer.asUint8List();
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} catch (e) {
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_cachedLogoBytes = Uint8List(0);
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}
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}
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/// Tronque un texte
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static String _truncate(String text, int max) {
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return text.length <= max ? text : '${text.substring(0, max - 3)}...';
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}
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/// Génère un PDF avec QR codes pour n'importe quel type d'objet
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///
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/// [items] : Liste des objets à générer
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/// [format] : Format des étiquettes (small, medium, large)
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/// [getId] : Fonction pour obtenir l'ID unique
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/// [getTitle] : Fonction pour obtenir le titre (optionnel)
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/// [getDetails] : Fonction pour obtenir les détails (optionnel, seulement pour large)
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/// [onProgress] : Callback de progression (optionnel)
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static Future<Uint8List> generatePDF<T>({
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required List<T> items,
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required QRLabelFormat format,
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required String Function(T) getId,
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String Function(T)? getTitle,
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List<String> Function(T)? getDetails,
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Function(int current, int total)? onProgress,
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}) async {
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if (items.isEmpty) {
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throw Exception('La liste d\'items est vide');
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}
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final config = PDFGeneratorConfig.fromFormat(format);
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final pdf = pw.Document();
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// Pré-charger le logo pour format large
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if (format == QRLabelFormat.large) {
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await _ensureLogoLoaded();
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}
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// Générer tous les QR codes en bulk avec progression
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final allQRImages = await QRCodeService.generateBulkQRCodes(
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items.map((item) => getId(item)).toList(),
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size: config.qrCodeSize,
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withLogo: false,
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useCache: true,
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onProgress: onProgress,
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);
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// Générer les pages
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switch (format) {
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case QRLabelFormat.small:
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_addSmallLabels(pdf, items, getId, allQRImages, config);
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break;
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case QRLabelFormat.medium:
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_addMediumLabels(pdf, items, getId, getTitle, allQRImages, config);
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break;
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case QRLabelFormat.large:
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_addLargeLabels(pdf, items, getId, getTitle, getDetails, allQRImages, config);
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break;
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}
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return pdf.save();
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}
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// ========================================================================
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// PETITS LABELS (2x2 cm, 20 par page)
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// ========================================================================
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static void _addSmallLabels<T>(
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pw.Document pdf,
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List<T> items,
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String Function(T) getId,
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List<Uint8List> qrImages,
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PDFGeneratorConfig config,
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) {
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const qrSize = 56.69; // 2cm
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for (int pageStart = 0; pageStart < items.length; pageStart += config.itemsPerPage) {
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final pageItems = items.skip(pageStart).take(config.itemsPerPage).toList();
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final pageQRs = qrImages.skip(pageStart).take(config.itemsPerPage).toList();
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pdf.addPage(
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pw.Page(
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pageFormat: PdfPageFormat.a4,
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margin: const pw.EdgeInsets.all(20),
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build: (_) => pw.Wrap(
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spacing: 10,
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runSpacing: 10,
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children: List.generate(pageItems.length, (i) {
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return pw.Container(
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width: qrSize,
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height: qrSize + 20,
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child: pw.Column(
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mainAxisAlignment: pw.MainAxisAlignment.center,
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children: [
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pw.Image(pw.MemoryImage(pageQRs[i])),
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pw.SizedBox(height: 2),
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pw.Text(
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getId(pageItems[i]),
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style: pw.TextStyle(fontSize: 6, fontWeight: pw.FontWeight.bold),
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textAlign: pw.TextAlign.center,
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),
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],
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),
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);
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}),
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),
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),
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);
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}
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}
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// ========================================================================
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// LABELS MOYENS (4x4 cm, 6 par page)
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// ========================================================================
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static void _addMediumLabels<T>(
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pw.Document pdf,
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List<T> items,
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String Function(T) getId,
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String Function(T)? getTitle,
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List<Uint8List> qrImages,
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PDFGeneratorConfig config,
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) {
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const qrSize = 113.39; // 4cm
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for (int pageStart = 0; pageStart < items.length; pageStart += config.itemsPerPage) {
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final pageItems = items.skip(pageStart).take(config.itemsPerPage).toList();
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final pageQRs = qrImages.skip(pageStart).take(config.itemsPerPage).toList();
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pdf.addPage(
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pw.Page(
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pageFormat: PdfPageFormat.a4,
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margin: const pw.EdgeInsets.all(20),
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build: (_) => pw.Wrap(
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spacing: 20,
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runSpacing: 20,
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children: List.generate(pageItems.length, (i) {
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return pw.Container(
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width: qrSize,
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height: qrSize + 30,
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child: pw.Column(
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mainAxisAlignment: pw.MainAxisAlignment.center,
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children: [
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pw.Image(pw.MemoryImage(pageQRs[i])),
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pw.SizedBox(height: 4),
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pw.Text(
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getId(pageItems[i]),
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style: pw.TextStyle(fontSize: 10, fontWeight: pw.FontWeight.bold),
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textAlign: pw.TextAlign.center,
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),
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if (getTitle != null) ...[
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pw.SizedBox(height: 2),
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pw.Text(
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_truncate(getTitle(pageItems[i]), 25),
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style: const pw.TextStyle(fontSize: 8, color: PdfColors.grey700),
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textAlign: pw.TextAlign.center,
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),
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],
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],
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),
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);
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}),
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),
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),
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);
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}
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}
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// ========================================================================
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// GRANDS LABELS (avec détails, 10 par page)
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// ========================================================================
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static void _addLargeLabels<T>(
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pw.Document pdf,
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List<T> items,
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String Function(T) getId,
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String Function(T)? getTitle,
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List<String> Function(T)? getDetails,
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List<Uint8List> qrImages,
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PDFGeneratorConfig config,
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) {
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const qrSize = 100.0;
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for (int pageStart = 0; pageStart < items.length; pageStart += config.itemsPerPage) {
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final pageItems = items.skip(pageStart).take(config.itemsPerPage).toList();
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final pageQRs = qrImages.skip(pageStart).take(config.itemsPerPage).toList();
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pdf.addPage(
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pw.Page(
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pageFormat: PdfPageFormat.a4,
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margin: const pw.EdgeInsets.all(20),
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build: (_) => pw.Wrap(
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spacing: 10,
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runSpacing: 10,
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children: List.generate(pageItems.length, (i) {
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final item = pageItems[i];
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return pw.Container(
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width: 260,
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height: 120,
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decoration: pw.BoxDecoration(
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border: pw.Border.all(color: PdfColors.grey400),
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borderRadius: pw.BorderRadius.circular(4),
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),
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padding: const pw.EdgeInsets.all(8),
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child: pw.Row(
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crossAxisAlignment: pw.CrossAxisAlignment.start,
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children: [
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// QR Code
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pw.Container(
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width: qrSize,
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height: qrSize,
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child: pw.Image(pw.MemoryImage(pageQRs[i])),
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),
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pw.SizedBox(width: 8),
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// Détails
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pw.Expanded(
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child: pw.Column(
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crossAxisAlignment: pw.CrossAxisAlignment.start,
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children: [
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// Logo
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if (_cachedLogoBytes != null && _cachedLogoBytes!.isNotEmpty)
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pw.Center(
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child: pw.Container(
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height: 25,
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margin: const pw.EdgeInsets.only(bottom: 6),
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child: pw.Image(pw.MemoryImage(_cachedLogoBytes!)),
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),
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),
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// Titre
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if (getTitle != null) ...[
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pw.SizedBox(height: 2),
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pw.Text(
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_truncate(getTitle(item), 20),
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style: pw.TextStyle(fontSize: 10, fontWeight: pw.FontWeight.bold),
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maxLines: 2,
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),
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],
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// ID
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pw.SizedBox(height: 2),
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pw.Text(
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getId(item),
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style: const pw.TextStyle(fontSize: 8, color: PdfColors.grey700),
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maxLines: 1,
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),
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// Détails supplémentaires
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if (getDetails != null) ...[
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pw.SizedBox(height: 4),
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...getDetails(item).take(5).map((line) {
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return pw.Padding(
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padding: const pw.EdgeInsets.only(bottom: 1),
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child: pw.Text(
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_truncate(line, 25),
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style: const pw.TextStyle(fontSize: 6, color: PdfColors.grey800),
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),
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);
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}),
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],
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],
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),
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),
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],
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),
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);
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}),
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),
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),
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);
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}
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}
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/// Nettoie le cache (logo)
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static void clearCache() {
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_cachedLogoBytes = null;
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_logoLoadAttempted = false;
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}
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}
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