PDF

lib/platform/pdf_platform.dart

@@ -0,0 +1,3 @@
+export 'pdf_platform_stub.dart'
+  if (dart.library.html) 'pdf_platform_web.dart'
+  if (dart.library.io) 'pdf_platform_io.dart';

lib/platform/pdf_platform_io.dart

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+import 'dart:typed_data';
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:open_filex/open_filex.dart';
+import 'package:path_provider/path_provider.dart';
+
+Future<void> platformViewPdf(BuildContext context, Uint8List bytes, {required String filename}) async {
+  final dir = await getTemporaryDirectory();
+  final f = File('${dir.path}/$filename');
+  await f.writeAsBytes(bytes);
+  await OpenFilex.open(f.path);
+}
+
+Future<void> platformDownloadPdf(Uint8List bytes, {required String filename}) async {
+  final savePath = await FilePicker.platform.saveFile(
+    dialogTitle: 'PDF speichern als',
+    fileName: filename,
+    type: FileType.custom,
+    allowedExtensions: ['pdf'],
+    lockParentWindow: true,
+  );
+  if (savePath == null) return;
+  final f = File(savePath);
+  await f.writeAsBytes(bytes);
+}

lib/platform/pdf_platform_stub.dart

@@ -0,0 +1,5 @@
+import 'dart:typed_data';
+import 'package:flutter/widgets.dart';
+
+Future<void> platformViewPdf(BuildContext context, Uint8List bytes, {required String filename}) async {}
+Future<void> platformDownloadPdf(Uint8List bytes, {required String filename}) async {}

lib/platform/pdf_platform_web.dart

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+import 'dart:typed_data';
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+// ignore: avoid_web_libraries_in_flutter
+import 'dart:html' as html;
+
+Future<void> platformViewPdf(BuildContext context, Uint8List bytes, {required String filename}) async {
+  final blob = html.Blob([bytes], 'application/pdf');
+  final url = html.Url.createObjectUrlFromBlob(blob);
+  final viewType = 'pdf-view-${DateTime.now().microsecondsSinceEpoch}';
+  final iframe = html.IFrameElement()
+    ..src = url
+    ..style.border = '0'
+    ..style.width = '100%'
+    ..style.height = '100%';
+  // ignore: undefined_prefixed_name
+  ui.platformViewRegistry.registerViewFactory(viewType, (int _) => iframe);
+
+  await showDialog<void>(
+    context: context,
+    builder: (ctx) => Dialog(
+      insetPadding: const EdgeInsets.all(16),
+      child: SizedBox(
+        width: 1000, height: 700,
+        child: Stack(children: [
+          HtmlElementView(viewType: viewType),
+          Positioned(
+            right: 8, top: 8,
+            child: IconButton(
+              tooltip: 'In neuem Tab öffnen',
+              icon: const Icon(Icons.open_in_new),
+              onPressed: () => html.window.open(url, '_blank'),
+            ),
+          ),
+        ]),
+      ),
+    ),
+  );
+  html.Url.revokeObjectUrl(url);
+}
+
+Future<void> platformDownloadPdf(Uint8List bytes, {required String filename}) async {
+  final blob = html.Blob([bytes], 'application/pdf');
+  final url = html.Url.createObjectUrlFromBlob(blob);
+  final a = html.AnchorElement(href: url)..download = filename;
+  a.click();
+  html.Url.revokeObjectUrl(url);
+}