Add text input to the demo

@@ -16,6 +16,7 @@
 
 import 'dart:async';
 import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -28,6 +29,7 @@ import 'package:printing_demo/certificate.dart';
 import 'package:url_launcher/url_launcher.dart' as ul;
 
 import 'calendar.dart';
+import 'data.dart';
 import 'document.dart';
 import 'invoice.dart';
 import 'report.dart';
@@ -40,7 +42,7 @@ class MyApp extends StatefulWidget {
     Example('INVOICE', 'invoice.dart', generateInvoice),
     Example('REPORT', 'report.dart', generateReport),
     Example('CALENDAR', 'calendar.dart', generateCalendar),
-    Example('CERTIFICATE', 'certificate.dart', generateCertificate),
+    Example('CERTIFICATE', 'certificate.dart', generateCertificate, true),
   ];
 
   @override
@@ -55,12 +57,21 @@ class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
 
   PrintingInfo? printingInfo;
 
+  var _data = CustomData();
+  var _hasData = false;
+  var _pending = false;
+
   @override
   void initState() {
     super.initState();
     _init();
   }
 
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+  }
+
   Future<void> _init() async {
     final info = await Printing.info();
 
@@ -73,6 +84,18 @@ class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
       setState(() {
         _tab = _tabController!.index;
       });
+      if (MyApp.examples[_tab].needsData && !_hasData && !_pending) {
+        _pending = true;
+        askName(context).then((value) {
+          if (value != null) {
+            setState(() {
+              _data = CustomData(name: value);
+              _hasData = true;
+              _pending = false;
+            });
+          }
+        });
+      }
     });
 
     setState(() {
@@ -81,10 +104,7 @@ class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
   }
 
   void _showPrintedToast(BuildContext context) {
-    final scaffold = Scaffold.of(context);
-
-    // ignore: deprecated_member_use
-    scaffold.showSnackBar(
+    ScaffoldMessenger.of(context).showSnackBar(
       const SnackBar(
         content: Text('Document printed successfully'),
       ),
@@ -92,10 +112,7 @@ class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
   }
 
   void _showSharedToast(BuildContext context) {
-    final scaffold = Scaffold.of(context);
-
-    // ignore: deprecated_member_use
-    scaffold.showSnackBar(
+    ScaffoldMessenger.of(context).showSnackBar(
       const SnackBar(
         content: Text('Document shared successfully'),
       ),
@@ -144,7 +161,7 @@ class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
       ),
       body: PdfPreview(
         maxPageWidth: 700,
-        build: MyApp.examples[_tab].builder,
+        build: (format) => MyApp.examples[_tab].builder(format, _data),
         actions: actions,
         onPrinted: _showPrintedToast,
         onShared: _showSharedToast,
@@ -162,14 +179,47 @@ class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
       'https://github.com/DavBfr/dart_pdf/blob/master/demo/lib/${MyApp.examples[_tab].file}',
     );
   }
+
+  Future<String?> askName(BuildContext context) {
+    return showDialog<String>(
+        barrierDismissible: false,
+        context: context,
+        builder: (context) {
+          final controller = TextEditingController();
+
+          return AlertDialog(
+            title: Text('Please type your name:'),
+            contentPadding: EdgeInsets.symmetric(horizontal: 20),
+            content: TextField(
+              decoration: InputDecoration(hintText: '[your name]'),
+              controller: controller,
+            ),
+            actions: [
+              TextButton(
+                onPressed: () {
+                  if (controller.text != '') {
+                    Navigator.pop(context, controller.text);
+                  }
+                },
+                child: Text('OK'),
+              ),
+            ],
+          );
+        });
+  }
 }
 
+typedef LayoutCallbackWithData = Future<Uint8List> Function(
+    PdfPageFormat pageFormat, CustomData data);
+
 class Example {
-  const Example(this.name, this.file, this.builder);
+  const Example(this.name, this.file, this.builder, [this.needsData = false]);
 
   final String name;
 
   final String file;
 
-  final LayoutCallback builder;
+  final LayoutCallbackWithData builder;
+
+  final bool needsData;
 }

@@ -21,6 +21,8 @@ import 'package:intl/intl.dart';
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart';
 
+import 'data.dart';
+
 class Calendar extends StatelessWidget {
   Calendar({
     this.date,
@@ -174,7 +176,8 @@ class Calendar extends StatelessWidget {
   }
 }
 
-Future<Uint8List> generateCalendar(PdfPageFormat pageFormat) async {
+Future<Uint8List> generateCalendar(
+    PdfPageFormat pageFormat, CustomData data) async {
   //Create a PDF document.
   final document = Document();
   final date = DateTime.now();

@@ -23,6 +23,8 @@ import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 import 'package:vector_math/vector_math_64.dart';
 
+import 'data.dart';
+
 final _cache = <String, Uint8List>{};
 
 Future<Uint8List> _download(String url) async {
@@ -41,7 +43,8 @@ Future<pw.Font> _downloadFont(String url) async {
   return pw.Font.ttf(data.buffer.asByteData());
 }
 
-Future<Uint8List> generateCertificate(PdfPageFormat pageFormat) async {
+Future<Uint8List> generateCertificate(
+    PdfPageFormat pageFormat, CustomData data) async {
   final lorem = pw.LoremText();
   final pdf = pw.Document();
 
@@ -97,7 +100,7 @@ Future<Uint8List> generateCertificate(PdfPageFormat pageFormat) async {
             child: pw.Divider(color: PdfColors.grey, thickness: 1.5),
           ),
           pw.Text(
-            'Louis Mitchell',
+            data.name,
             style: pw.TextStyle(
               fontWeight: pw.FontWeight.bold,
               fontSize: 20,
@@ -127,7 +130,7 @@ Future<Uint8List> generateCertificate(PdfPageFormat pageFormat) async {
               pw.Padding(
                 padding: pw.EdgeInsets.symmetric(horizontal: 10),
                 child: pw.Text(
-                  'Rubix Cube Challenge',
+                  'Flutter PDF Demo',
                   style: pw.TextStyle(
                     fontSize: 10,
                   ),

+class CustomData {
+  const CustomData({this.name = '[your name]'});
+
+  final String name;
+}

@@ -19,7 +19,10 @@ import 'dart:typed_data';
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 
-Future<Uint8List> generateDocument(PdfPageFormat format) async {
+import 'data.dart';
+
+Future<Uint8List> generateDocument(
+    PdfPageFormat format, CustomData data) async {
   final doc = pw.Document(pageMode: PdfPageMode.outlines);
 
   doc.addPage(pw.MultiPage(

@@ -21,7 +21,10 @@ import 'package:intl/intl.dart';
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 
-Future<Uint8List> generateInvoice(PdfPageFormat pageFormat) async {
+import 'data.dart';
+
+Future<Uint8List> generateInvoice(
+    PdfPageFormat pageFormat, CustomData data) async {
   final lorem = pw.LoremText();
 
   final products = <Product>[

@@ -21,7 +21,10 @@ import 'package:flutter/services.dart';
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 
-Future<Uint8List> generateReport(PdfPageFormat pageFormat) async {
+import 'data.dart';
+
+Future<Uint8List> generateReport(
+    PdfPageFormat pageFormat, CustomData data) async {
   const tableHeaders = ['Category', 'Budget', 'Expense', 'Result'];
 
   const dataTable = [

@@ -21,12 +21,13 @@ import 'dart:typed_data';
 import 'package:flutter/services.dart';
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
+import 'package:printing_demo/data.dart';
 
 const PdfColor green = PdfColor.fromInt(0xff9ce5d0);
 const PdfColor lightGreen = PdfColor.fromInt(0xffcdf1e7);
 const sep = 120.0;
 
-Future<Uint8List> generateResume(PdfPageFormat format) async {
+Future<Uint8List> generateResume(PdfPageFormat format, CustomData data) async {
   final doc = pw.Document(title: 'My Résumé', author: 'David PHAM-VAN');
 
   final profileImage = pw.MemoryImage(

@@ -2,11 +2,13 @@ import 'dart:io';
 
 import 'package:flutter_test/flutter_test.dart';
 import 'package:pdf/pdf.dart';
+import 'package:printing_demo/data.dart';
 import 'package:printing_demo/document.dart';
 
 void main() {
   testWidgets('Pdf Generate the document', (WidgetTester tester) async {
-    final doc = await generateDocument(PdfPageFormat.a4);
+    final data = CustomData();
+    final doc = await generateDocument(PdfPageFormat.a4, data);
 
     final file = File('document.pdf');
     file.writeAsBytesSync(doc);