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

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Merged
merged 1 commit into from
Apr 5, 2021
Merged

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

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16 changes: 8 additions & 8 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ Row(
highlightColor: Colors.lightGreen,
onPressed: () {
setState(() {
_controller.backward();
_controller.backward!();
});
},
)),
Expand All @@ -64,7 +64,7 @@ Row(
highlightColor: Colors.lightGreen,
onPressed: () {
setState(() {
_controller.forward();
_controller.forward!();
});
},
)),
Expand Down Expand Up @@ -104,13 +104,13 @@ Using the `onViewChanged` callback of the date picker, you can get the mid date

```xml
void viewChanged(DateRangePickerViewChangedArgs args) {
_startDate = (args.visibleDateRange.startDate
.difference(args.visibleDateRange.endDate)
.inDays);
var middleDate = (_startDate ~/ 2).toInt();
midDate = args.visibleDateRange.startDate.add(Duration(days: middleDate));
final DateTime visibleStartDate = args.visibleDateRange.startDate!;
final DateTime visibleEndDate = args.visibleDateRange.endDate!;
final int totalVisibleDays = (visibleStartDate.difference(visibleEndDate).inDays);
final DateTime midDate =
visibleStartDate.add(Duration(days: totalVisibleDays ~/ 2));
headerString = DateFormat('MMMM yyyy').format(midDate).toString();
SchedulerBinding.instance.addPostFrameCallback((duration) {
SchedulerBinding.instance!.addPostFrameCallback((duration) {
setState(() {});
});
}
Expand Down
50 changes: 16 additions & 34 deletions lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -23,36 +23,17 @@ class HeaderCustomization extends StatefulWidget {
}

class _HeaderCustomizationState extends State<HeaderCustomization> {
DateRangePickerController _controller;
int _startDate;
String headerString;
DateTime midDate;
double width, cellWidth, height, cellHeight;

@override
void initState() {
// TODO: implement initState
_controller = DateRangePickerController();
_startDate = 0;
width = 0.0;
cellWidth = 0.0;
height = 0.0;
cellHeight = 0.0;
midDate = DateTime.now();
headerString = '';
super.initState();
}
final DateRangePickerController _controller = DateRangePickerController();
String headerString = '';

@override
Widget build(BuildContext context) {
width = MediaQuery.of(context).size.width;
cellWidth = width / 9;
height = MediaQuery.of(context).size.height;
cellHeight = height / 17;
final double width = MediaQuery.of(context).size.width;
final double cellWidth = width / 9;

return Scaffold(
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
children: <Widget>[
Expand All @@ -71,7 +52,7 @@ class _HeaderCustomizationState extends State<HeaderCustomization> {
highlightColor: Colors.lightGreen,
onPressed: () {
setState(() {
_controller.backward();
_controller.backward!();
});
},
)),
Expand All @@ -94,7 +75,7 @@ class _HeaderCustomizationState extends State<HeaderCustomization> {
highlightColor: Colors.lightGreen,
onPressed: () {
setState(() {
_controller.forward();
_controller.forward!();
});
},
)),
Expand All @@ -118,22 +99,23 @@ class _HeaderCustomizationState extends State<HeaderCustomization> {
monthCellStyle: DateRangePickerMonthCellStyle(
cellDecoration: BoxDecoration(color: Color(0xFF6fb98f)),
leadingDatesDecoration:
BoxDecoration(color: Color(0xFF6fb98f)),
BoxDecoration(color: Color(0xFF6fb98f)),
trailingDatesDecoration:
BoxDecoration(color: Color(0xFF6fb98f)))),
BoxDecoration(color: Color(0xFF6fb98f)))),
)
],
));
}

void viewChanged(DateRangePickerViewChangedArgs args) {
_startDate = (args.visibleDateRange.startDate
.difference(args.visibleDateRange.endDate)
.inDays);
var middleDate = (_startDate ~/ 2).toInt();
midDate = args.visibleDateRange.startDate.add(Duration(days: middleDate));
final DateTime visibleStartDate = args.visibleDateRange.startDate!;
final DateTime visibleEndDate = args.visibleDateRange.endDate!;
final int totalVisibleDays =
(visibleStartDate.difference(visibleEndDate).inDays);
final DateTime midDate =
visibleStartDate.add(Duration(days: totalVisibleDays ~/ 2));
headerString = DateFormat('MMMM yyyy').format(midDate).toString();
SchedulerBinding.instance.addPostFrameCallback((duration) {
SchedulerBinding.instance!.addPostFrameCallback((duration) {
setState(() {});
});
}
Expand Down
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