Merge pull request #1 from Sasikumar3595/main

FLUT-4313-Sample updated with null safety.

Author: jayaleshwari

lib/main.dart

@@ -10,14 +10,7 @@ class HeaderStyle extends StatefulWidget {
 }
 
 class CalendarExample extends State<HeaderStyle> {
-  DateRangePickerHeaderStyle _headerStyle;
-  int _count;
-  DateTime _midDate;
-
-  @override
-  initState() {
-    super.initState();
-  }
+  DateRangePickerHeaderStyle _headerStyle = DateRangePickerHeaderStyle();
 
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -37,15 +30,13 @@ class CalendarExample extends State<HeaderStyle> {
   }
 
   void viewChanged(DateRangePickerViewChangedArgs viewChangedDetails) {
-    SchedulerBinding.instance.addPostFrameCallback((duration) {
-      _count = (viewChangedDetails.visibleDateRange.endDate
-          .difference(viewChangedDetails.visibleDateRange.startDate)
-          .inDays);
-      var _middleDate = (_count ~/ 2).toInt();
-      _midDate = viewChangedDetails.visibleDateRange.startDate
-          .add(Duration(days: _middleDate));
+    final DateTime startDate = viewChangedDetails.visibleDateRange.startDate!;
+    final DateTime endDate = viewChangedDetails.visibleDateRange.endDate!;
+    final int count = endDate.difference(startDate).inDays;
+    final DateTime midDate = startDate.add(Duration(days: count ~/ 2));
+    SchedulerBinding.instance!.addPostFrameCallback((duration) {
       setState(() {
-        if (_midDate.month % 2 == 0) {
+        if (midDate.month % 2 == 0) {
           _headerStyle = DateRangePickerHeaderStyle(
               textAlign: TextAlign.center,
               backgroundColor: Colors.lightGreen,

pubspec.lock

@@ -7,42 +7,42 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0-nullsafety.3"
+    version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.3"
+    version: "2.1.0"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.5"
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.2.0"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.3"
+    version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0-nullsafety.5"
+    version: "1.15.0"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -56,7 +56,7 @@ packages:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -73,28 +73,28 @@ packages:
       name: intl
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.16.1"
+    version: "0.17.0"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.10-nullsafety.3"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety.6"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0-nullsafety.3"
+    version: "1.8.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -106,69 +106,69 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0-nullsafety.4"
+    version: "1.8.1"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.10.0-nullsafety.6"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.3"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety.3"
+    version: "1.1.0"
   syncfusion_flutter_core:
     dependency: transitive
     description:
       name: syncfusion_flutter_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "18.4.41"
+    version: "19.1.55"
   syncfusion_flutter_datepicker:
     dependency: "direct main"
     description:
       name: syncfusion_flutter_datepicker
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "18.4.41-beta"
+    version: "19.1.55-beta"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0-nullsafety.3"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19-nullsafety.6"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety.5"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety.5"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.12.0-0.0 <3.0.0"
+  dart: ">=2.12.0 <3.0.0"

pubspec.yaml

@@ -18,19 +18,19 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
 #  syncfusion_flutter_calendar:
 #    path: E:\jan 20\flutter-calendar\flutter_calendar\syncfusion_flutter_calendar
-  syncfusion_flutter_datepicker: 18.4.41-beta
-  intl: ^0.16.1
+  syncfusion_flutter_datepicker: ^19.1.55-beta
+  intl: ^0.17.0
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^1.0.1
+  cupertino_icons: ^1.0.2
 
 dev_dependencies:
   flutter_test: