FLUT-4313-Sample updated with null safety.

README.md

@@ -3,29 +3,21 @@
 In the flutter date range picker, you can customize the month cells by using the `specialDates`, `blackoutDates`, and `showTrailingAndLeadingDates` properties.
 
 ## Step 1:
-In initState(), set the default dates for special, blackout dates, and set the default color values for the weekend days, special dates, current date, blackout dates, leading and trailing dates.
+Inside the state, set the default color values for the weekend days, special dates, current date, blackout dates, leading and trailing dates and initialize the special and blackout dates on initState().
 
 ```xml
-DateRangePickerController _controller;
-List<DateTime> _blackoutDates;
-List<DateTime> _specialDates;
-Color weekEndColor,
-    specialDatesColor,
-    todayColor,
-    leadingTrailingDatesColor,
-    blackoutDatesColor;
-
+late List<DateTime> _blackoutDates;
+late List<DateTime> _specialDates;
+final Color weekEndColor = Color(0xFF0e9aa7),
+    specialDatesColor = Color(0xFFf6cd61),
+    todayColor = Color(0xFFff6f69),
+    leadingTrailingDatesColor = Color(0xFF88d8b0),
+    blackoutDatesColor = Colors.black;
+
 @override
 void initState() {
-  // TODO: implement initState
-  _controller = DateRangePickerController();
   _blackoutDates = _getBlackoutDates();
   _specialDates = _getSpecialDates();
-  weekEndColor = Color(0xFF0e9aa7);
-  leadingTrailingDatesColor = Color(0xFF88d8b0);
-  specialDatesColor = Color(0xFFf6cd61);
-  todayColor = Color(0xFFff6f69);
-  blackoutDatesColor = Colors.black;
   super.initState();
 }
 ```
@@ -43,6 +35,7 @@ body: Card(
         specialDates: _specialDates,
         showTrailingAndLeadingDates: true,
         blackoutDates: _blackoutDates),
+    selectionColor: Color(0xFFf8dbdff),
     monthCellStyle: DateRangePickerMonthCellStyle(
         blackoutDateTextStyle: TextStyle(
             color: blackoutDatesColor,
@@ -53,7 +46,6 @@ body: Card(
             color: specialDatesColor),
         specialDatesTextStyle: TextStyle(color: Colors.black),
         cellDecoration: BoxDecoration(shape: BoxShape.circle),
-        selectionColor: Color(0xFFf8dbdff),
         todayTextStyle: TextStyle(color: Colors.white),
         todayCellDecoration:
             BoxDecoration(shape: BoxShape.circle, color: todayColor),

lib/main.dart

@@ -23,26 +23,18 @@ class MonthCellCustomization extends StatefulWidget {
 }
 
 class _MonthCellCustomizationState extends State<MonthCellCustomization> {
-  DateRangePickerController _controller;
-  List<DateTime> _blackoutDates;
-  List<DateTime> _specialDates;
-  Color weekEndColor,
-      specialDatesColor,
-      todayColor,
-      leadingTrailingDatesColor,
-      blackoutDatesColor;
+  late List<DateTime> _blackoutDates;
+  late List<DateTime> _specialDates;
+  final Color weekEndColor = Color(0xFF0e9aa7),
+      specialDatesColor = Color(0xFFf6cd61),
+      todayColor = Color(0xFFff6f69),
+      leadingTrailingDatesColor = Color(0xFF88d8b0),
+      blackoutDatesColor = Colors.black;
 
   @override
   void initState() {
-    // TODO: implement initState
-    _controller = DateRangePickerController();
     _blackoutDates = _getBlackoutDates();
     _specialDates = _getSpecialDates();
-    weekEndColor = Color(0xFF0e9aa7);
-    leadingTrailingDatesColor = Color(0xFF88d8b0);
-    specialDatesColor = Color(0xFFf6cd61);
-    todayColor = Color(0xFFff6f69);
-    blackoutDatesColor = Colors.black;
     super.initState();
   }
 
@@ -57,6 +49,7 @@ class _MonthCellCustomizationState extends State<MonthCellCustomization> {
             specialDates: _specialDates,
             showTrailingAndLeadingDates: true,
             blackoutDates: _blackoutDates),
+        selectionColor: Color(0xFFf8dbdff),
         monthCellStyle: DateRangePickerMonthCellStyle(
             blackoutDateTextStyle: TextStyle(
                 color: blackoutDatesColor,
@@ -67,7 +60,6 @@ class _MonthCellCustomizationState extends State<MonthCellCustomization> {
                 color: specialDatesColor),
             specialDatesTextStyle: TextStyle(color: Colors.black),
             cellDecoration: BoxDecoration(shape: BoxShape.circle),
-            selectionColor: Color(0xFFf8dbdff),
             todayTextStyle: TextStyle(color: Colors.white),
             todayCellDecoration:
                 BoxDecoration(shape: BoxShape.circle, color: todayColor),

pubspec.lock

@@ -1,69 +1,62 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.11"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.5.2"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.0"
+    version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
-  charcode:
+    version: "2.1.0"
+  characters:
     dependency: transitive
     description:
-      name: charcode
+      name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
-  collection:
+    version: "1.1.0"
+  charcode:
     dependency: transitive
     description:
-      name: collection
+      name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.11"
-  convert:
+    version: "1.2.0"
+  clock:
     dependency: transitive
     description:
-      name: convert
+      name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
-  crypto:
+    version: "1.1.0"
+  collection:
     dependency: transitive
     description:
-      name: crypto
+      name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.3"
+    version: "1.15.0"
   cupertino_icons:
     dependency: "direct main"
     description:
       name: cupertino_icons
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.3"
+    version: "1.0.2"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -74,74 +67,34 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  flutter_web_plugins:
-    dependency: transitive
-    description: flutter
-    source: sdk
-    version: "0.0.0"
-  image:
-    dependency: transitive
-    description:
-      name: image
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.4"
   intl:
     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: "0.12.6"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.8"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.4"
-  pedantic:
-    dependency: transitive
-    description:
-      name: pedantic
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.8.0+1"
-  petitparser:
-    dependency: transitive
-    description:
-      name: petitparser
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.4.0"
-  plugin_platform_interface:
-    dependency: transitive
-    description:
-      name: plugin_platform_interface
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.2"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.5"
+    version: "1.8.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -153,112 +106,69 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.5"
+    version: "1.8.1"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0"
   syncfusion_flutter_core:
     dependency: transitive
     description:
       name: syncfusion_flutter_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "18.1.36"
+    version: "19.1.54+1"
   syncfusion_flutter_datepicker:
     dependency: "direct main"
     description:
       name: syncfusion_flutter_datepicker
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "18.1.36-beta"
+    version: "19.1.54-beta.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.11"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.6"
-  url_launcher:
-    dependency: transitive
-    description:
-      name: url_launcher
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "5.4.2"
-  url_launcher_macos:
-    dependency: transitive
-    description:
-      name: url_launcher_macos
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.0.1+4"
-  url_launcher_platform_interface:
-    dependency: transitive
-    description:
-      name: url_launcher_platform_interface
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.6"
-  url_launcher_web:
-    dependency: transitive
-    description:
-      name: url_launcher_web
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.1.1+1"
-  utf:
-    dependency: transitive
-    description:
-      name: utf
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.0+5"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
-  xml:
-    dependency: transitive
-    description:
-      name: xml
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "3.5.0"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.5.0 <3.0.0"
-  flutter: ">=1.12.8 <2.0.0"
+  dart: ">=2.12.0 <3.0.0"