implemented making a pdf from DetailPage.dart and croping image to 1:1 format

lib/AddPage.dart

@@ -1,8 +1,10 @@
 import 'dart:io';
+import 'dart:math';
 import 'package:firebase_storage/firebase_storage.dart';
 import 'package:flutter/material.dart';
 import 'package:image_picker/image_picker.dart';
 import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:image/image.dart' as img;
 
 
 class AddScreen extends StatefulWidget {
@@ -35,6 +37,27 @@ class _AddScreenState extends State<AddScreen> {
     return fileSize <= maxSizeInBytes;
   }
 
+  Future<File> _cropImage(File imageFile) async {
+    final originalImage = img.decodeImage(await imageFile.readAsBytes());
+
+    if (originalImage != null) {
+      int originSize = min(originalImage.width, originalImage.height);
+      final croppedImage = img.copyCrop(
+          originalImage,
+          x: (originalImage.width - originSize)~/2,
+          y: (originalImage.height - originSize)~/2,
+          width: originSize,
+          height: originSize
+      );
+      final newPath = imageFile.path.substring(0, imageFile.path.lastIndexOf('/'));
+      final newFile = File('$newPath/cropped.jpg');
+      await newFile.writeAsBytes(img.encodePng(croppedImage));
+      return newFile;
+    } else {
+      throw Exception('Unable to decode image file.');
+    }
+  }
+
   Future<void> _getImage(ImageSource source) async {
     final pickedFile = await ImagePicker().pickImage(source: source);
 
@@ -42,8 +65,9 @@ class _AddScreenState extends State<AddScreen> {
       final tempFile = File(pickedFile.path);
       final bool isValid = await isFileSizeValid(tempFile, 10);
       if (isValid) {
+        File croppedFile = await _cropImage(tempFile);  // Bild zuschneiden
         setState(() {
-          _imageFile = tempFile;
+          _imageFile = croppedFile;
         });
       } else {
         ScaffoldMessenger.of(context).showSnackBar(
@@ -53,6 +77,7 @@ class _AddScreenState extends State<AddScreen> {
     }
   }
 
+
   Future<void> addNewElementToFirestore(String title, String description, File imageFile, {required Function(bool) onComplete}) async {
     String collectionName;
     if (_selectedIndex == 0) {

lib/DetailPage.dart

@@ -1,5 +1,9 @@
-import 'package:cached_network_image/cached_network_image.dart';
+import 'dart:typed_data';
+import 'package:pdf/widgets.dart' as pdfWidgets;
+import 'package:printing/printing.dart';
 import 'package:flutter/material.dart';
+import 'package:http/http.dart' as http;
+import 'package:cached_network_image/cached_network_image.dart';
 
 class DetailPage extends StatelessWidget {
   final String title;
@@ -15,11 +19,62 @@ class DetailPage extends StatelessWidget {
     required this.imageUrl,
   }) : super(key: key);
 
+
+  Future<void> _printPdf() async {
+    final pdf = pdfWidgets.Document();
+    final image = await _loadNetworkImage(imageUrl);
+
+    pdf.addPage(
+      pdfWidgets.MultiPage(
+        build: (context) => [
+          pdfWidgets.Center(
+            child: pdfWidgets.SizedBox(
+              width: double.infinity, // Die Breite auf die maximal mögliche Breite setzen
+              child: pdfWidgets.AspectRatio(
+                aspectRatio: 1, // Sie können das Seitenverhältnis entsprechend Ihrem Bild anpassen
+                child: pdfWidgets.Image(image),
+              ),
+            ),
+          ),
+          pdfWidgets.Text(
+              title,
+              style: pdfWidgets.TextStyle(
+                  fontSize: 20,
+                  fontWeight: pdfWidgets.FontWeight.bold // Titel fett
+              )
+          ),
+          pdfWidgets.Text(datum, style: const pdfWidgets.TextStyle(fontSize: 14, )),
+          pdfWidgets.Paragraph(text: description, style: const pdfWidgets.TextStyle(fontSize: 12)),
+        ],
+      ),
+    );
+    await Printing.sharePdf(bytes: await pdf.save(), filename: '$title.pdf');
+  }
+
+  Future<pdfWidgets.ImageProvider> _loadNetworkImage(String url) async {
+    final response = await http.get(Uri.parse(url));
+
+    if (response.statusCode != 200) {
+      throw Exception('Failed to load network image.');
+    }
+
+    final Uint8List bytes = response.bodyBytes;
+    final imageProvider = pdfWidgets.MemoryImage(bytes);
+
+    return imageProvider;
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         title: Text(title),
+        actions: <Widget>[
+          IconButton(
+            icon: const Icon(Icons.picture_as_pdf),
+            onPressed: _printPdf,
+          ),
+        ],
       ),
       body: SingleChildScrollView(
         child: Column(

pubspec.lock

@@ -25,6 +25,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.10.0"
+  barcode:
+    dependency: transitive
+    description:
+      name: barcode
+      sha256: "52570564684bbb0240a9f1fdb6bad12adc5e0540103c1c96d6dd550bd928b1c9"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.3"
+  bidi:
+    dependency: transitive
+    description:
+      name: bidi
+      sha256: dc00274c7edabae2ab30c676e736ea1eb0b1b7a1b436cb5fe372e431ccb39ab0
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.6"
   boolean_selector:
     dependency: transitive
     description:
@@ -312,6 +328,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.0.16"
+  image_cropper:
+    dependency: "direct main"
+    description:
+      name: image_cropper
+      sha256: "710ab4b7953e9ce1d27d833f741e5f8f3afb0b0ba3556dc0b844741b5f55c2b3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
+  image_cropper_for_web:
+    dependency: transitive
+    description:
+      name: image_cropper_for_web
+      sha256: "09e93a8ec0435adcaa23622ac090442872f18145d70b9ff605ffedcf97d56255"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.3"
+  image_cropper_platform_interface:
+    dependency: transitive
+    description:
+      name: image_cropper_platform_interface
+      sha256: "62349e3aab63873ea9b9ab9f69d036ab8a0d74b3004beec4303981386cb9273f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
   image_picker:
     dependency: "direct main"
     description:
@@ -416,6 +456,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.8.2"
+  path_parsing:
+    dependency: transitive
+    description:
+      name: path_parsing
+      sha256: e3e67b1629e6f7e8100b367d3db6ba6af4b1f0bb80f64db18ef1fbabd2fa9ccf
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.1"
   path_provider:
     dependency: transitive
     description:
@@ -464,6 +512,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.6"
+  pdf:
+    dependency: "direct main"
+    description:
+      name: pdf
+      sha256: "586d3debf5432e5377044754032cfa53ab45e9abf371d4865e9ad5019570e246"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.10.1"
+  pdf_widget_wrapper:
+    dependency: transitive
+    description:
+      name: pdf_widget_wrapper
+      sha256: "754867bf32c4683da29ccc6bf31250905431fb0818a7258c153e21cd627b3212"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   pedantic:
     dependency: transitive
     description:
@@ -504,6 +568,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.7.3"
+  printing:
+    dependency: "direct main"
+    description:
+      name: printing
+      sha256: "6aa86779d51f1c60608defee7b231e1133ab9b00f63b3b71abfa85cb39898571"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.10.4"
   process:
     dependency: transitive
     description:
@@ -512,6 +584,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.2.4"
+  qr:
+    dependency: transitive
+    description:
+      name: qr
+      sha256: "64957a3930367bf97cc211a5af99551d630f2f4625e38af10edd6b19131b64b3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.1"
   rxdart:
     dependency: transitive
     description:
@@ -647,4 +727,4 @@ packages:
     version: "6.2.2"
 sdks:
   dart: ">=2.19.0 <3.0.0"
-  flutter: ">=3.3.0"
+  flutter: ">=3.7.0"

pubspec.yaml

@@ -47,6 +47,9 @@ dependencies:
   change_app_package_name: ^1.1.0
   cached_network_image: ^3.2.3
   image: ^4.0.16
+  pdf: ^3.10.1
+  printing: ^5.10.4
+  image_cropper: ^3.0.3
 
 
 dev_dependencies: