Add Flutter 3.7 compatibility

 include: package:flutter_lints/flutter.yaml
 
 analyzer:
-  strong-mode:
-    implicit-dynamic: false
   errors:
     missing_required_param: warning
     missing_return: warning

@@ -10,6 +10,7 @@
 - Fix lints
 - Add options to customise border in Dataset widget [838]
 - Add Choice Field [Carsten Fregin]
+- Add Flutter 3.7 compatibility
 
 ## 3.8.4
 

 include: package:flutter_lints/flutter.yaml
 
 analyzer:
-  strong-mode:
-    implicit-dynamic: false
   errors:
     missing_required_param: warning
     missing_return: warning

@@ -76,7 +76,6 @@ class PdfBool extends PdfDataType {
 class PdfNum extends PdfDataType {
   const PdfNum(this.value)
       : assert(value != double.infinity),
-        assert(value != double.nan),
         assert(value != double.negativeInfinity);
 
   static const int precision = 5;
@@ -85,6 +84,9 @@ class PdfNum extends PdfDataType {
 
   @override
   void output(PdfStream s, [int? indent]) {
+    assert(!value.isNaN);
+    assert(!value.isInfinite);
+
     if (value is int) {
       s.putString(value.toInt().toString());
     } else {

@@ -11,7 +11,7 @@ environment:
 dependencies:
   archive: ^3.1.0
   barcode: ">=2.2.3 <3.0.0"
-  bidi: ^2.0.2
+  bidi: ^2.0.6
   crypto: ^3.0.0
   image: ^4.0.0
   meta: ">=1.3.0 <2.0.0"

@@ -7,6 +7,7 @@
 - Update Image dependency
 - Fix canChangeOrientation option not appearing bug [Bilal Raja]
 - Add Support cmaps option on printing web [Koji Wakamiya]
+- Add Flutter 3.7 compatibility
 
 ## 5.9.3
 

 include: package:flutter_lints/flutter.yaml
 
 analyzer:
-  strong-mode:
-    implicit-dynamic: false
   errors:
     missing_required_param: warning
     missing_return: warning

@@ -25,8 +25,8 @@ import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 
 /// ImageProvider that draws a Flutter Widget on a PDF document
-class WidgetWraper extends pw.ImageProvider {
-  WidgetWraper._(
+class WidgetWrapper extends pw.ImageProvider {
+  WidgetWrapper._(
     this.bytes,
     int width,
     int height,
@@ -51,7 +51,7 @@ class WidgetWraper extends pw.ImageProvider {
   /// Future<Uint8List> _generatePdf(PdfPageFormat format) async {
   ///   final pdf = pw.Document();
   ///
-  ///   final image = await WidgetWraper.fromKey(key: rb);
+  ///   final image = await WidgetWrapper.fromKey(key: rb);
   ///
   ///   pdf.addPage(
   ///     pw.Page(
@@ -66,7 +66,7 @@ class WidgetWraper extends pw.ImageProvider {
   ///   return pdf.save();
   /// }
   /// ```
-  static Future<WidgetWraper> fromKey({
+  static Future<WidgetWrapper> fromKey({
     required GlobalKey key,
     int? width,
     int? height,
@@ -82,7 +82,7 @@ class WidgetWraper extends pw.ImageProvider {
     final byteData = await image.toByteData(format: ui.ImageByteFormat.rawRgba);
 
     if (byteData == null) {
-      return WidgetWraper._(
+      return WidgetWrapper._(
         Uint8List(0),
         0,
         0,
@@ -92,7 +92,7 @@ class WidgetWraper extends pw.ImageProvider {
     }
 
     final imageData = byteData.buffer.asUint8List();
-    return WidgetWraper._(
+    return WidgetWrapper._(
       imageData,
       image.width,
       image.height,
@@ -104,7 +104,7 @@ class WidgetWraper extends pw.ImageProvider {
   /// Wrap a Flutter Widget to an ImageProvider.
   ///
   /// ```
-  /// final wrapped = await WidgetWraper.fromWidget(
+  /// final wrapped = await WidgetWrapper.fromWidget(
   ///   widget: Container(
   ///     color: Colors.white,
   ///     child: Text(
@@ -125,7 +125,7 @@ class WidgetWraper extends pw.ImageProvider {
   ///   ),
   /// );
   /// ```
-  static Future<WidgetWraper> fromWidget({
+  static Future<WidgetWrapper> fromWidget({
     required Widget widget,
     required BoxConstraints constraints,
     double pixelRatio = 1.0,
@@ -170,11 +170,7 @@ class WidgetWraper extends pw.ImageProvider {
       configuration: ViewConfiguration(
           size: Size(_constraints.maxWidth, _constraints.maxHeight),
           devicePixelRatio: ui.window.devicePixelRatio),
-      window: _FlutterView(
-        configuration: ui.ViewConfiguration(
-          devicePixelRatio: ui.window.devicePixelRatio,
-        ),
-      ),
+      window: ui.window,
     );
 
     final pipelineOwner = PipelineOwner()..rootNode = renderView;
@@ -204,7 +200,7 @@ class WidgetWraper extends pw.ImageProvider {
       throw Exception('Unable to read image data');
     }
 
-    return WidgetWraper._(
+    return WidgetWrapper._(
       bytes.buffer.asUint8List(),
       image.width,
       image.height,
@@ -228,15 +224,51 @@ class WidgetWraper extends pw.ImageProvider {
   }
 }
 
-class _FlutterView extends ui.FlutterView {
-  _FlutterView({required this.configuration});
-
-  final ui.ViewConfiguration configuration;
+/// ImageProvider that draws a Flutter Widget on a PDF document
+@Deprecated('Use WidgetWrapper instead')
+class WidgetWraper extends WidgetWrapper {
+  WidgetWraper._(
+    Uint8List bytes,
+    int width,
+    int height,
+    PdfImageOrientation orientation,
+    double? dpi,
+  ) : super._(bytes, width, height, orientation, dpi);
 
-  @override
-  ui.PlatformDispatcher get platformDispatcher =>
-      ui.PlatformDispatcher.instance;
+  /// Wrap a Flutter Widget identified by a GlobalKey to an ImageProvider.
+  @Deprecated('Use WidgetWrapper.fromKey instead')
+  static Future<WidgetWrapper> fromKey({
+    required GlobalKey key,
+    int? width,
+    int? height,
+    double pixelRatio = 1.0,
+    PdfImageOrientation? orientation,
+    double? dpi,
+  }) {
+    return WidgetWrapper.fromKey(
+      key: key,
+      width: width,
+      pixelRatio: pixelRatio,
+      orientation: orientation,
+      dpi: dpi,
+    );
+  }
 
-  @override
-  ui.ViewConfiguration get viewConfiguration => configuration;
+  /// Wrap a Flutter Widget to an ImageProvider.
+  @Deprecated('Use WidgetWrapper.fromWidget instead')
+  static Future<WidgetWrapper> fromWidget({
+    required Widget widget,
+    required BoxConstraints constraints,
+    double pixelRatio = 1.0,
+    PdfImageOrientation? orientation,
+    double? dpi,
+  }) {
+    return WidgetWrapper.fromWidget(
+      widget: widget,
+      constraints: constraints,
+      pixelRatio: pixelRatio,
+      orientation: orientation,
+      dpi: dpi,
+    );
+  }
 }

@@ -14,13 +14,11 @@
  * limitations under the License.
  */
 
-// @dart=2.9
-
 import 'dart:io';
 
 import 'package:markdown/markdown.dart' as md;
 
-Iterable<String> getCode(List<md.Node> nodes, [bool isCode = false]) sync* {
+Iterable<String> getCode(List<md.Node>? nodes, [bool isCode = false]) sync* {
   if (nodes == null) {
     return;
   }

@@ -14,8 +14,6 @@
  * limitations under the License.
  */
 
-// @dart=2.9
-
 import 'dart:io';
 
 import 'package:pdf/pdf.dart';
@@ -154,15 +152,16 @@ Future<void> main() async {
 }
 
 class SyntaxHighlighterStyle {
-  const SyntaxHighlighterStyle(
-      {this.baseStyle,
-      this.numberStyle,
-      this.commentStyle,
-      this.keywordStyle,
-      this.stringStyle,
-      this.punctuationStyle,
-      this.classStyle,
-      this.constantStyle});
+  const SyntaxHighlighterStyle({
+    required this.baseStyle,
+    required this.numberStyle,
+    required this.commentStyle,
+    required this.keywordStyle,
+    required this.stringStyle,
+    required this.punctuationStyle,
+    required this.classStyle,
+    required this.constantStyle,
+  });
 
   final TextStyle baseStyle;
   final TextStyle numberStyle;
@@ -190,9 +189,7 @@ class SyntaxHighlighterStyle {
 }
 
 class DartSyntaxHighlighter {
-  DartSyntaxHighlighter(this._style) {
-    _spans = <_HighlightSpan>[];
-  }
+  DartSyntaxHighlighter(this._style);
 
   final SyntaxHighlighterStyle _style;
 
@@ -259,10 +256,10 @@ class DartSyntaxHighlighter {
     'bool'
   ];
 
-  String _src;
-  StringScanner _scanner;
+  late String _src;
+  late StringScanner _scanner;
 
-  List<_HighlightSpan> _spans;
+  final _spans = <_HighlightSpan>[];
 
   TextSpan format(String source) {
     _src = source;
@@ -306,18 +303,18 @@ class DartSyntaxHighlighter {
       // Block comments
       if (_scanner.scan(RegExp(r'/\*(.|\n)*\*/'))) {
         _spans.add(_HighlightSpan(_HighlightType.comment,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Line comments
       if (_scanner.scan('//')) {
-        final int startComment = _scanner.lastMatch.start;
+        final int startComment = _scanner.lastMatch!.start;
 
         bool eof = false;
         int endComment;
         if (_scanner.scan(RegExp(r'.*\n'))) {
-          endComment = _scanner.lastMatch.end - 1;
+          endComment = _scanner.lastMatch!.end - 1;
         } else {
           eof = true;
           endComment = _src.length;
@@ -336,78 +333,78 @@ class DartSyntaxHighlighter {
       // Raw r"String"
       if (_scanner.scan(RegExp(r'r".*"'))) {
         _spans.add(_HighlightSpan(_HighlightType.string,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Raw r'String'
       if (_scanner.scan(RegExp(r"r'.*'"))) {
         _spans.add(_HighlightSpan(_HighlightType.string,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Multiline """String"""
       if (_scanner.scan(RegExp(r'"""(?:[^"\\]|\\(.|\n))*"""'))) {
         _spans.add(_HighlightSpan(_HighlightType.string,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Multiline '''String'''
       if (_scanner.scan(RegExp(r"'''(?:[^'\\]|\\(.|\n))*'''"))) {
         _spans.add(_HighlightSpan(_HighlightType.string,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // "String"
       if (_scanner.scan(RegExp(r'"(?:[^"\\]|\\.)*"'))) {
         _spans.add(_HighlightSpan(_HighlightType.string,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // 'String'
       if (_scanner.scan(RegExp(r"'(?:[^'\\]|\\.)*'"))) {
         _spans.add(_HighlightSpan(_HighlightType.string,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Double
       if (_scanner.scan(RegExp(r'\d+\.\d+'))) {
         _spans.add(_HighlightSpan(_HighlightType.number,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Integer
       if (_scanner.scan(RegExp(r'\d+'))) {
         _spans.add(_HighlightSpan(_HighlightType.number,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Punctuation
       if (_scanner.scan(RegExp(r'[\[\]{}().!=<>&\|\?\+\-\*/%\^~;:,]'))) {
         _spans.add(_HighlightSpan(_HighlightType.punctuation,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Meta data
       if (_scanner.scan(RegExp(r'@\w+'))) {
         _spans.add(_HighlightSpan(_HighlightType.keyword,
-            _scanner.lastMatch.start, _scanner.lastMatch.end));
+            _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         continue;
       }
 
       // Words
       if (_scanner.scan(RegExp(r'\w+'))) {
-        _HighlightType type;
+        _HighlightType? type;
 
-        String word = _scanner.lastMatch[0];
+        String word = _scanner.lastMatch![0]!;
         if (word.startsWith('_')) {
           word = word.substring(1);
         }
@@ -425,7 +422,7 @@ class DartSyntaxHighlighter {
 
         if (type != null) {
           _spans.add(_HighlightSpan(
-              type, _scanner.lastMatch.start, _scanner.lastMatch.end));
+              type, _scanner.lastMatch!.start, _scanner.lastMatch!.end));
         }
       }