How share data between widget in PageView? - flutter

Question

I would like to make a 4 step form in a PageView. There are 4 widgets each corresponding to a stage. Each widget has a TextField and a button to go to the next page. On the last widget the button must retrieve the 4 values ​​of the Textfields to be able to save them. How can I do ?
Widget build(BuildContext context) {
super.build(context);
Size _screenSize = MediaQuery.of(context).size;
return Scaffold(
key: _scaffoldKey,
body: PageView(
controller: controller,
scrollDirection: scrollDirection,
pageSnapping: true,
children: <Widget>[
TitleInput(pcontainer: widget.pcontainer, controller: controller),
DescriptionInput(pcontainer: widget.pcontainer, controller: controller),
EstimationPage(pcontainer: widget.pcontainer, controller: controller),
ImageCapture()
],
),
);
}```
//Button to go to next page:
Widget showNextPage(PageController controller, String topicTitle) {
return new Padding(
padding: EdgeInsets.fromLTRB(12.0, 45.0, 12.0, 0.0),
child: SizedBox(
height: 60.0,
width: 70,
child: new RaisedButton(
elevation: 5.0,
shape: new RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(30.0)),
color: Colors.blue,
child: new Text('Suivant',
style: new TextStyle(fontSize: 20.0, color: Colors.white)),
onPressed: () => controller.nextPage(curve: Curves.ease, duration: Duration(milliseconds: 300)),
),
)
);
}

Answer 1

I would like to suggest you an alternative solution: rather than using a PageView, you could try the Stepper widget.
You can define the steps that indicate a sequential order of events that must happen and, of course, it's very customizable. Here's the basic skeleton of how you'd use this widget:
Stepper(
steps: [
Step(
title: Text("Step number 1"),
content: Text("widgets"),
),
Step(
title: Text("Step number 2"),
content: Text("widgets"),
),
],
)
There is a very good article on medium that shows many tips for this widget.
I think that if you have an ordered series of steps, you should really try this widget as it is easy to use and very intuitive for the user.

Answer 2

This specific requirement can be fulfilled by creating a Data Model object to hold all the required data and passing this object through each widget to update respective data.
For example:
class DataModel {
String fullName;
String aboutInfo;
String contactDetails;
}
and then Pass the Model's instance(_dataModel) as below:
mainWidget calls =>fullNameWidget(_dataModel) // updates only fullName
fullNameWidget calls =>descriptionWidget(_dataModel) // updates only aboutInfo
descriptionWidget calls =>contactWidget(_dataModel) // updates only contactDetails
contactWidget calls =>finalWidget(_dataModel) // uses data collected in the _dataModel
The important thing is that you make sure to pass the same model instance in each widget to update its respective field and then use the updated data from the instance to go ahead and save it in the last step.

Answer 3

Simply use the Static Variable
// Define the Static Variable in Global class you can use any name
class Global{
static String s1,s2,s3,s4;
}
you can Assign the Values by
Global.s1 = "someValue";
you can Access the Value by
print(Global.s1);