Enable external widgets to set DatePicker state

example/ios/Flutter/flutter_export_environment.sh

@@ -1,12 +1,12 @@
 #!/bin/sh
 # This is a generated file; do not edit or check into version control.
-export "FLUTTER_ROOT=/Users/vivek/development/flutter"
-export "FLUTTER_APPLICATION_PATH=/Users/vivek/StudioProjects/DatePickerTimelineFlutter/example"
-export "FLUTTER_TARGET=lib/main.dart"
+export "FLUTTER_ROOT=D:\flutter"
+export "FLUTTER_APPLICATION_PATH=D:\gcloud_projects\flutterapp\datetime\DatePickerTimelineFlutter\example"
+export "FLUTTER_TARGET=lib\main.dart"
 export "FLUTTER_BUILD_DIR=build"
-export "SYMROOT=${SOURCE_ROOT}/../build/ios"
+export "SYMROOT=${SOURCE_ROOT}/../build\ios"
 export "OTHER_LDFLAGS=$(inherited) -framework Flutter"
-export "FLUTTER_FRAMEWORK_DIR=/Users/vivek/development/flutter/bin/cache/artifacts/engine/ios"
+export "FLUTTER_FRAMEWORK_DIR=D:\flutter\bin\cache\artifacts\engine\ios"
 export "FLUTTER_BUILD_NAME=1.0.0"
 export "FLUTTER_BUILD_NUMBER=1"
 export "DART_OBFUSCATION=false"

example/lib/main.dart

@@ -29,7 +29,6 @@ class _MyHomePageState extends State<MyHomePage> {
 
   DateTime _selectedValue = DateTime.now();
 
-
   @override
   void initState() {
     super.initState();
@@ -38,12 +37,12 @@ class _MyHomePageState extends State<MyHomePage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      floatingActionButton: FloatingActionButton(
-        child: Icon(Icons.replay),
-        onPressed: () {
-          _controller.animateToSelection();
-        },
-      ),
+        floatingActionButton: FloatingActionButton(
+          child: Icon(Icons.replay),
+          onPressed: () {
+            _controller.animateToSelection();
+          },
+        ),
         appBar: AppBar(
           title: Text(widget.title),
         ),
@@ -83,6 +82,44 @@ class _MyHomePageState extends State<MyHomePage> {
                   },
                 ),
               ),
+              Padding(
+                padding: const EdgeInsets.all(40.0),
+                child: Row(
+                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                  children: [
+                    RaisedButton(
+                      color: Colors.lightBlueAccent,
+                      onPressed: () {
+                        //Make sure within valid date range of DatePicker.
+                        //Skipping the check here as its example
+                        DateTime _currentDate = _controller.getCurrentDate();
+                        _controller.setCurrentDate(
+                            _currentDate.add(Duration(days: 1)));
+                        _controller.animateToSelection();
+                      },
+                      child: Text(
+                        "Set Next day",
+                        style: TextStyle(fontSize: 15),
+                      ),
+                    ),
+                    RaisedButton(
+                      color: Colors.lightBlueAccent,
+                      onPressed: () {
+                        //Make sure within valid date range of DatePicker.
+                        //Skipping the check here as its example
+                        DateTime _currentDate = _controller.getCurrentDate();
+                        _controller.setCurrentDate(
+                            _currentDate.subtract(Duration(days: 1)));
+                        _controller.animateToSelection();
+                      },
+                      child: Text(
+                        "Set Previous day",
+                        style: TextStyle(fontSize: 15),
+                      ),
+                    ),
+                  ],
+                ),
+              )
             ],
           ),
         ));

example/pubspec.lock

@@ -7,42 +7,42 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.2"
+    version: "2.5.0-nullsafety.1"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0-nullsafety.1"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.0"
+    version: "1.1.0-nullsafety.3"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.3"
+    version: "1.2.0-nullsafety.1"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.1"
+    version: "1.1.0-nullsafety.1"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.13"
+    version: "1.15.0-nullsafety.3"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -56,14 +56,14 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "1.2.0"
+    version: "1.2.1"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0-nullsafety.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -87,21 +87,21 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.8"
+    version: "0.12.10-nullsafety.1"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.8"
+    version: "1.3.0-nullsafety.3"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0-nullsafety.1"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -113,55 +113,55 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0-nullsafety.2"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.5"
+    version: "1.10.0-nullsafety.1"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0-nullsafety.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0-nullsafety.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0-nullsafety.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.17"
+    version: "0.2.19-nullsafety.2"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.0-nullsafety.3"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
+    version: "2.1.0-nullsafety.3"
 sdks:
-  dart: ">=2.9.0-14.0.dev <3.0.0"
+  dart: ">=2.10.0-110 <2.11.0"

lib/date_picker_widget.dart

@@ -142,6 +142,12 @@ class _DatePickerState extends State<DatePicker> {
     }
   }
 
+  void setCurrentDate(DateTime date) {
+    setState(() {
+      _currentDate = date;
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     return Container(
@@ -191,13 +197,19 @@ class _DatePickerState extends State<DatePicker> {
             date: date,
             monthTextStyle: isDeactivated
                 ? deactivatedMonthStyle
-                : isSelected ? selectedMonthStyle : widget.monthTextStyle,
+                : isSelected
+                    ? selectedMonthStyle
+                    : widget.monthTextStyle,
             dateTextStyle: isDeactivated
                 ? deactivatedDateStyle
-                : isSelected ? selectedDateStyle : widget.dateTextStyle,
+                : isSelected
+                    ? selectedDateStyle
+                    : widget.dateTextStyle,
             dayTextStyle: isDeactivated
                 ? deactivatedDayStyle
-                : isSelected ? selectedDayStyle : widget.dayTextStyle,
+                : isSelected
+                    ? selectedDayStyle
+                    : widget.dayTextStyle,
             width: widget.width,
             locale: widget.locale,
             selectionColor:
@@ -207,12 +219,10 @@ class _DatePickerState extends State<DatePicker> {
               if (isDeactivated) return;
 
               // A date is selected
-              if (widget.onDateChange != null ) {
+              if (widget.onDateChange != null) {
                 widget.onDateChange(selectedDate);
+                setCurrentDate(selectedDate);
               }
-              setState(() {
-                _currentDate = selectedDate;
-              });
             },
           );
         },
@@ -236,6 +246,24 @@ class DatePickerController {
     _datePickerState = state;
   }
 
+  void setCurrentDate(DateTime date) {
+    assert(_datePickerState != null,
+        'DatePickerController is not attached to any DatePicker View.');
+
+    //Allows external widgets to set date of DatePicker.
+    //Propersolution would be to implement standard state management.
+    _datePickerState.setCurrentDate(date);
+  }
+
+  DateTime getCurrentDate() {
+    assert(_datePickerState != null,
+        'DatePickerController is not attached to any DatePicker View.');
+
+    //Allows external widgets to get date of DatePicker
+    //More propersolution would be to implement standard state management.
+    return _datePickerState._currentDate;
+  }
+
   void jumpToSelection() {
     assert(_datePickerState != null,
         'DatePickerController is not attached to any DatePicker View.');