FLUT-4313-Sample updated with null safety.

Author: Sasikumar3595

lib/main.dart

@@ -20,13 +20,7 @@ class RangeSelectionInPicker extends StatefulWidget {
 }
 
 class RangeSelectionInPickerState extends State<RangeSelectionInPicker> {
-  DateRangePickerController _controller;
-
-  @override
-  void initState() {
-    _controller = DateRangePickerController();
-    super.initState();
-  }
+  final DateRangePickerController _controller = DateRangePickerController();
 
   @override
   Widget build(BuildContext context) {
@@ -44,23 +38,24 @@ class RangeSelectionInPickerState extends State<RangeSelectionInPicker> {
                   onSelectionChanged: selectionChanged))
         ],
       ),
-      // This trailing comma makes auto-formatting nicer for build methods.
     );
   }
 
   void selectionChanged(DateRangePickerSelectionChangedArgs args) {
-    List<PickerDateRange> dateRanges, ranges;
-    dateRanges = (args.value as List<PickerDateRange>);
-    DateTime date = dateRanges[dateRanges.length - 1].startDate;
-    if (_controller.selectedRanges != null) {
-    _controller.selectedRanges.clear();
-    ranges = _controller.selectedRanges;
-    ranges.addAll(<PickerDateRange>[
-      PickerDateRange(
-          date.add(Duration(days: -3)), date.add(Duration(days: -1))),
-      PickerDateRange(date.add(Duration(days: 1)), date.add(Duration(days: 3)))
-    ]);
-    _controller.selectedRanges = ranges;
+    final List<PickerDateRange> dateRanges =
+        (args.value as List<PickerDateRange>);
+    final DateTime? date = dateRanges.isNotEmpty
+        ? dateRanges[dateRanges.length - 1].startDate!
+        : null;
+    if (date != null &&
+        _controller.selectedRanges != null &&
+        dateRanges[dateRanges.length - 1].endDate == null) {
+      _controller.selectedRanges = <PickerDateRange>[
+        PickerDateRange(
+            date.add(Duration(days: -3)), date.add(Duration(days: -1))),
+        PickerDateRange(
+            date.add(Duration(days: 1)), date.add(Duration(days: 3)))
+      ];
     }
   }
 }

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
@@ -68,40 +68,33 @@ packages:
     source: sdk
     version: "0.0.0"
   intl:
-    dependency: "direct main"
+    dependency: transitive
     description:
       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"
-  pedantic:
-    dependency: transitive
-    description:
-      name: pedantic
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.9.2"
+    version: "1.8.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -113,83 +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"
-  syncfusion_flutter_calendar:
-    dependency: "direct main"
-    description:
-      name: syncfusion_flutter_calendar
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "18.4.32"
+    version: "1.1.0"
   syncfusion_flutter_core:
     dependency: transitive
     description:
       name: syncfusion_flutter_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "18.4.32"
+    version: "19.1.55"
   syncfusion_flutter_datepicker:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: syncfusion_flutter_datepicker
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "18.4.32-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"
-  timezone:
-    dependency: transitive
-    description:
-      name: timezone
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.5.9"
+    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

@@ -18,18 +18,17 @@ 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_datepicker: 18.4.32-beta
-  intl: ^0.16.1
-  syncfusion_flutter_calendar: 18.4.32
+
+  syncfusion_flutter_datepicker: ^19.1.55-beta
 
   # 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: