Update the example to use PdfPreview

 # Changelog
 
+## 3.6.1
+
+- Update the example to use PdfPreview
+
 ## 3.6.0
 
 - Added pdfFileName prop to PdfPreview Widget [Marcos Rodriguez]

@@ -134,6 +134,23 @@ final pdf = await rootBundle.load('document.pdf');
 await Printing.layoutPdf(onLayout: (_) => pdf.buffer.asUint8List());
 ```
 
+## Designing your PDF document
+
+A good starting point is to use PdfPreview which features hot-reload pdf build
+and refresh.
+
+Take a look at the [example tab](example) for a sample project.
+
+This widget also features a debug switch at the bottom right to display the
+drawing constraints used. This switch is available only on debug builds.
+
+Moving on to your production application, you can keep only the `_generatePdf`
+function and print the document using:
+
+```dart
+await Printing.layoutPdf(onLayout: (format) => _generatePdf(format, title));
+```
+
 ## Encryption and Digital Signature
 
 Encryption using RC4-40, RC4-128, AES-128, and AES-256 is fully supported using a separate library.

 // ignore_for_file: always_specify_types
 // ignore_for_file: public_member_api_docs
 
+import 'dart:typed_data';
+
 import 'package:flutter/material.dart';
+import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 import 'package:printing/printing.dart';
 
-void main() => runApp(MyApp());
+void main() => runApp(const MyApp('Printing Demo'));
 
 class MyApp extends StatelessWidget {
+  const MyApp(this.title);
+
+  final String title;
+
   @override
   Widget build(BuildContext context) {
-    const title = 'Printing Demo';
-
     return MaterialApp(
-      title: title,
       home: Scaffold(
-        appBar: AppBar(
-          title: const Text(title),
-        ),
-        body: Center(
-          child: IconButton(
-            icon: const Icon(Icons.print),
-            onPressed: _printDocument,
-          ),
+        appBar: AppBar(title: Text(title)),
+        body: PdfPreview(
+          build: (format) => _generatePdf(format, title),
         ),
       ),
     );
   }
 
-  void _printDocument() {
-    Printing.layoutPdf(
-      onLayout: (pageFormat) {
-        final doc = pw.Document();
-
-        doc.addPage(
-          pw.Page(
-            build: (pw.Context context) => pw.Center(
-              child: pw.Text('Hello World!'),
-            ),
-          ),
-        );
-
-        return doc.save();
-      },
+  Future<Uint8List> _generatePdf(PdfPageFormat format, String title) async {
+    final pdf = pw.Document();
+
+    pdf.addPage(
+      pw.Page(
+        pageFormat: format,
+        build: (context) {
+          return pw.Center(
+            child: pw.Text(title),
+          );
+        },
+      ),
     );
+
+    return pdf.save();
   }
 }

@@ -4,7 +4,7 @@ description: Plugin that allows Flutter apps to generate and print documents to
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/printing
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 3.6.0
+version: 3.6.1
 
 environment:
   sdk: ">=2.3.0 <3.0.0"