Having a little hard time doing what I want to achieve.
I am using googlesheets as database, with autosort function to sort the products.
In flutter, after editing 3 products, the flutter app stops "refreshing" so It stops updating inside the app, but in the googlesheets it's always updating.
This is what I currently have to edit the date.
Future<void> _updateDate(
BuildContext context) async {
final DateTime? nD =
await showDatePicker(
context: context,
initialDate: DateTime.now(),
firstDate: DateTime(1901, 1),
lastDate: DateTime(2100));
if (nD != oD) {
await widget.provider
.pushNewDate(_nDF, index);
setState(() {});
//this is what I added after changing some code
Future.delayed(const Duration(seconds: 1),
(() => (setState(() {}))));
///
}
}
If you wrap the _updateDate in a set state it will propably work . If it doesnt try _updateDate.then(SetState(){});
after a long time I figured it out it was not on my end bue on google sheets that took a litle time to update. I went for another route!
Related
I have a Future (async) Date&Time picker function which works fine from within the body of my stateful widget which contains the "Builder" and the function can be called via the onpressed by just this:
onPressed: () {SelectDayAndTimeL();},
Code:
Future _selectDayAndTimeL(BuildContext context) async {
DateTime _selectedDay = await showDatePicker(
context: context,
initialDate: DateTime.now(),
firstDate: DateTime(2021),
lastDate: DateTime(2030),
builder: (BuildContext context, Widget child) => child);
TimeOfDay _selectedTime = await showTimePicker(
context: context,
initialTime: TimeOfDay.now(),
);
if (_selectedDay != null && _selectedTime != null) {
//a little check
}
setState(() {
selectedDateAndTime = DateTime(
_selectedDay.year,
_selectedDay.month,
_selectedDay.day,
_selectedTime.hour,
_selectedTime.minute,
);
// _selectedDate = _selectedDay;
});
// print('...');
}
Now I want to be able to call this function from different dart files/screens which means I have to keep this function on a different dart file which I have tried to do, but because of the setState in the function it needs to be inside a stateful widget. I have tried putting it inside a stateful widget but keeps getting errors.
class Picker extends StatefulWidget {
#override
_PickerState createState() => _PickerState();
}
class _PickerState extends State<Picker> {
#override
Future<Widget> build(BuildContext context) async { //the error in on the build on this line
DateTime _selectedDay = await showDatePicker(
context: context,
initialDate: DateTime.now(),
firstDate: DateTime(2021),
lastDate: DateTime(2030),
builder: (BuildContext context, Widget child) => child);
TimeOfDay _selectedTime = await showTimePicker(
context: context,
initialTime: TimeOfDay.now(),
);
if (_selectedDay != null && _selectedTime != null) {
//a little check
}
setState(() {
selectedDateAndTime = DateTime(
_selectedDay.year,
_selectedDay.month,
_selectedDay.day,
_selectedTime.hour,
_selectedTime.minute,
);
// _selectedDate = _selectedDay;
});
}
}
How do I properly place the Future Function inside a stateful widget and how to call it on an onpressed?
I don't know if the title I gave this question is actually what it's supposed to be, but I don't know how else to put it.
The whole setState inside your method is the problem. Your method should do one thing: get a date and time from the user. And there it's responsibility ends.
Future<DateTime> SelectDayAndTimeL(BuildContext context) async {
DateTime _selectedDay = await showDatePicker(
context: context,
initialDate: DateTime.now(),
firstDate: DateTime(2021),
lastDate: DateTime(2030),
builder: (BuildContext context, Widget child) => child);
TimeOfDay _selectedTime = await showTimePicker(
context: context,
initialTime: TimeOfDay.now(),
);
if (_selectedDay != null && _selectedTime != null) {
//a little check
}
return DateTime(
_selectedDay.year,
_selectedDay.month,
_selectedDay.day,
_selectedTime.hour,
_selectedTime.minute,
);
}
Now your onPressed becomes:
onPressed: () async {
final pickedDatetime = await SelectDayAndTimeL(context);
setState(() { selectedDateAndTime = pickedDatetime });
},
You have sucessfully divided your code into the function that picks a thing and your widget, which updates after the thing is picked.
The function that picks the date and time can now be reused in every other widget.
Create a function which will take datetime as a parameter and setstate of the stateful widget. Write this inside the stateful widget. Pass this function to the other class as an argument. Once the date is picked call this method by passing the datetime selected.
You should pass the setState function itself as a parameter to the method. This way, inside the method you will always be using the correct state setter function. That is especially necessary since you need to keep the variables _selectedDay etc inside the widget, not on the static method. Try this:
Future selectDayAndTimeL(BuildContext context, Function(DateTime) dateTimeSetter) async { //add a function to receive and use the
DateTime _selectedDay = await showDatePicker(
context: context,
initialDate: DateTime.now(),
firstDate: DateTime(2021),
lastDate: DateTime(2030),
builder: (BuildContext context, Widget child) => child);
TimeOfDay _selectedTime = await showTimePicker(
context: context,
initialTime: TimeOfDay.now(),
);
if (_selectedDay != null && _selectedTime != null) {
//a little check
}
// Create the variable with the picked date
DateTime selectedDateAndTime = DateTime(
_selectedDay.year,
_selectedDay.month,
_selectedDay.day,
_selectedTime.hour,
_selectedTime.minute,
);
//call the function from the parameter, which will be executed on the calling widget
dateTimeSetter(selectedDateAndTime);
....
}
Then, call your function to show the datetime picker passing the context, and a function that receives a DateTime parameter, which will be the parameter picked by the user. When the user picks a date, this function body will be executed, calling setState and setting the pickedTime variable.
class Picker extends StatefulWidget {
DateTime pickedTime;
#override
_PickerState createState() => _PickerState();
}
class _PickerState extends State<Picker> {
#override
Future<Widget> build(BuildContext context) async {
return ...
_selectDayAndTimeL(context, (DateTime time){
setState((){
widget.pickedTime = time;
});
});
...
You can also extract the function from the parameter into a normal named function, and just use its name in the parameter, but I'll leave it as is for now to make it simpler.
Also, don't forget to make your method public and static if necessary for the scope of your code.
I'm trying to let the user select only a certain time into business-hours (using 24H format), but I don't know how to achieve this. Is there a way to do it? I tried this plugin https://pub.dev/packages/time_picker_widget but it's not available in 24H format and sometimes it doesn't let you select a "correct" time
you need to use alwaysUse24HourFormat in MediaQuery like this
void inputTimeSelect() async {
final TimeOfDay picked = await showTimePicker(
context: context,
initialTime: TimeOfDay.now(),
builder: (BuildContext context, Widget child) {
return MediaQuery(
data: MediaQuery.of(context).copyWith(alwaysUse24HourFormat: true),
child: child,
);
},
);
}
i have this date picker in my app, and i want the last date to be 3 years ago from the time using the app how can i solve it, i tried to give the last date now.year -3 but it doesn't work! it keeps tell me that 'The instance member 'noww' can't be accessed in an initializer.'
var noww = DateTime.now();
DateTime selectedDate = DateTime(noww.year - 3);
showDatePicker(
context: context,
initialDate: selectedDate, // Refer step 1
firstDate: DateTime(now.year - 10),
lastDate: DateTime(now.year + 1),
Declare the variable now like this
var noww;
But then after that, run the rest of the code in initState(), like this
#override
void initState(){
super.initState();
noww = DateTime.now();
DateTime selectedDate = DateTime(noww.year - 3);
showDatePicker(
context: context,
initialDate: selectedDate, // Refer step 1
firstDate: DateTime(now.year - 10),
lastDate: DateTime(now.year + 1),
);
}
#override
Widget build(context){
...
}
This is because you cannot use initialisers outside of functions.
I want the user to pick a date using datePicker widget, when the user finish picking a date, a timePicker widget should appear and do the same thing. After that an item will be added to a list which uses the picked date & time. But what really happens is that everything shows up at the same time.
onPressed: () {
var date = DateTime.now();
showMaterialDatePicker(
context: context,
selectedDate: date,
onChanged: (value) => setState(() => date = value),
);
//Should wait until DatePicker finish
var time = TimeOfDay.now();
showMaterialTimePicker(
context: context,
selectedTime: time,
onChanged: (value) => setState(() => time = value),
);
//Should wait until timePicker finish, to add the item to the list
this.widget.litems.add(Reminder(
time: time,
date: date,
));
setState((){});
}
I suggest using the showDatePicker & showTimePicker. As per the documentation showDatePicker and showTimePicker returns Future. You can simply await these for the desired outcome.
onPressed: () async {
var date = DateTime.now();
date = await showDatePicker(
context: context,
initialDate: date,
);
//Should wait until DatePicker finish
var time = TimeOfDay.now();
time = await showTimePicker(
context: context,
initialTime: time,
);
//Should wait until timePicker finish, to add the item to the list
this.widget.litems.add(Reminder(
time: time,
date: date,
));
setState((){});
}
If you don't want to use these, then you should add showMaterialDatePicker & showMaterialTimePicker to separate functions which returns a Future and handle the logic inside those functions.
I've created an InkWell with an onTap function call as such
new InkWell(onTap: _handleSelectedDate,
...
)
Handle _handleSelectedDate is defined as a Future as the following
Future<Null> _handleSelectedDate(BuildContext context, AppModel model) async {
var endYear = new DateTime.now().year + 10;
var startYear = new DateTime.now().year - 100;
DateTime picked = await showDatePicker(
context: context,
initialDate: model.trackDate,
firstDate: new DateTime(startYear, 1),
lastDate: new DateTime(endYear));
if (picked != null) {
if (picked != model.trackDate) {
model.setTrackDate(picked);
}
}
}
If I call _handleSelectedDate with no parameters the call is valid, but I need to be able to pass a BuildContext and my Pages Model data through to it. As soon as I do this I get the following build error.
error: The argument type '(BuildContext, AppModel) → Future<Null>'
can't be assigned to the parameter type '() → void'.
I'm not sure how to resolve this. I just need a way to pass data through to the call so that I can reference my Model data (I'm experimenting with scoped_model)
You can wrap your call in a closure
new InkWell(
onTap: () => _handleSelectedDate(context, myModel),
)
The correct way of calling a Future is
new InkWell(
onTap: () async => await _handleSelectedDate(context, myModel),
)