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FLUT-4313-Sample updated with null safety. #4

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14 changes: 4 additions & 10 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,16 +3,10 @@
In the flutter date range picker, you can select the entire week when selecting a single day using the `onSelectionChanged` callback and `enableSwipeSelection` property.

## Step 1:
In initState(), initialize the controller for date range picker.
Inside the state, initialize the controller for date range picker.

```xml
DateRangePickerController _controller;
@override
void initState() {
// TODO: implement initState
_controller = DateRangePickerController();
super.initState();
}
final DateRangePickerController _controller = DateRangePickerController();
```
## Step 2:
Place the date range picker inside the body of the Scaffold widget, set the `selectionMode` as range selection and trigger the `onSelectionChanged` callback of the flutter date picker.
Expand Down Expand Up @@ -45,8 +39,8 @@ void selectionChanged(DateRangePickerSelectionChangedArgs args) {
int endDayOfWeek = (firstDayOfWeek - 1) % 7;
endDayOfWeek = endDayOfWeek < 0? 7 + endDayOfWeek : endDayOfWeek;
PickerDateRange ranges = args.value;
DateTime date1 = ranges.startDate;
DateTime date2 = ranges.endDate?? ranges.startDate;
DateTime date1 = ranges.startDate!;
DateTime date2 = (ranges.endDate?? ranges.startDate)!;
if(date1.isAfter(date2))
{
var date=date1;
Expand Down
40 changes: 16 additions & 24 deletions lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ class WeekSelection extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false ,
debugShowCheckedModeBanner: false,
home: WeekSelectionInPicker(),
);
}
Expand All @@ -20,14 +20,7 @@ class WeekSelectionInPicker extends StatefulWidget {
}

class _WeekSelectionInPickerState extends State<WeekSelectionInPicker> {
DateRangePickerController _controller;

@override
void initState() {
// TODO: implement initState
_controller = DateRangePickerController();
super.initState();
}
final DateRangePickerController _controller = DateRangePickerController();

@override
Widget build(BuildContext context) {
Expand All @@ -41,7 +34,8 @@ class _WeekSelectionInPickerState extends State<WeekSelectionInPicker> {
view: DateRangePickerView.month,
selectionMode: DateRangePickerSelectionMode.range,
onSelectionChanged: selectionChanged,
monthViewSettings: DateRangePickerMonthViewSettings(enableSwipeSelection: false),
monthViewSettings:
DateRangePickerMonthViewSettings(enableSwipeSelection: false),
),
)
],
Expand All @@ -51,33 +45,31 @@ class _WeekSelectionInPickerState extends State<WeekSelectionInPicker> {
);
}


void selectionChanged(DateRangePickerSelectionChangedArgs args) {
int firstDayOfWeek = DateTime.sunday % 7;
int endDayOfWeek = (firstDayOfWeek - 1) % 7;
endDayOfWeek = endDayOfWeek < 0? 7 + endDayOfWeek : endDayOfWeek;
endDayOfWeek = endDayOfWeek < 0 ? 7 + endDayOfWeek : endDayOfWeek;
PickerDateRange ranges = args.value;
DateTime date1 = ranges.startDate;
DateTime date2 = ranges.endDate?? ranges.startDate;
if(date1.isAfter(date2))
{
var date=date1;
date1=date2;
date2=date;
}
DateTime date1 = ranges.startDate!;
DateTime date2 = (ranges.endDate ?? ranges.startDate)!;
if (date1.isAfter(date2)) {
var date = date1;
date1 = date2;
date2 = date;
}
int day1 = date1.weekday % 7;
int day2 = date2.weekday % 7;

DateTime dat1 = date1.add(Duration(days: (firstDayOfWeek - day1)));
DateTime dat2 = date2.add(Duration(days: (endDayOfWeek - day2)));

if( !isSameDate(dat1, ranges.startDate)|| !isSameDate(dat2,ranges.endDate))
{
if (!isSameDate(dat1, ranges.startDate) ||
!isSameDate(dat2, ranges.endDate)) {
_controller.selectedRange = PickerDateRange(dat1, dat2);
}
}

bool isSameDate(DateTime date1, DateTime date2) {
bool isSameDate(DateTime? date1, DateTime? date2) {
if (date2 == date1) {
return true;
}
Expand All @@ -88,4 +80,4 @@ class _WeekSelectionInPickerState extends State<WeekSelectionInPicker> {
date1.year == date2.year &&
date1.day == date2.day;
}
}
}
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