Pas horizontal en scintillement
Je veux créer un stepper horizontal, ce qui est facile je sais, mais cette fois, le nombre de pas devrait être important.
Juste pour donner un exemple, c'est ce que je fais pour la verticale,
import 'package:flutter/material.Dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new HomePage(),
);
}
}
class HomePage extends StatelessWidget{
@override
Widget build(BuildContext context) {
return new Scaffold(
body: Container(
margin: EdgeInsets.symmetric(vertical: 20.0),
child: new ListView(
children: <Widget>[
new Text("Helllo "),
new Text( " Welcome"),
new Text (" Yaaa0"),
new SimpleWidget(),
],
), ),
);
}
}
class SimpleWidget extends StatefulWidget {
@override
SimpleWidgetState createState() => new SimpleWidgetState();
}
class SimpleWidgetState extends State<SimpleWidget> {
int stepCounter = 0;
List<Step> steps = [];
@override
void initState() {
prepareState();
super.initState();
}
void prepareState(){
for (var i= 0; i<100; i++){
var stepVal = new Step(
title:new Text("Step $i"),
content: new Text("This is the child of $i step"),
isActive: true,
);
steps.add(stepVal);
}
}
@override
Widget build(BuildContext context) {
return new Container(
child: new Stepper(
type: StepperType.vertical,
physics : ClampingScrollPhysics(),
currentStep: this.stepCounter,
steps: steps,
onStepTapped: (step) {
setState(() {
stepCounter = step;
});
},
onStepCancel: () {
setState(() {
stepCounter > 0 ? stepCounter -= 1 : stepCounter = 0;
});
},
onStepContinue: () {
setState(() {
stepCounter < steps.length - 1 ? stepCounter += 1 : stepCounter = 0;
});
},
),
);
}
}
Dès que j'essaye de recréer cela en mode horizontal, cela ne montre rien. J'ai essayé de rendre le listView horizontal, j'ai essayé de rendre le stepper horizontal, à la fois individuellement et aussi ensemble. Aucun ne fonctionne. Vous pouvez essayer cela dans le dartpad.
Ma question: 1. Comment faire un Stepper en horizontal qui peut faire défiler en mode horizontal. 2. Le contenu du Stepper est scrollable, je peux le voir. Peut-il être désactivé?
essayez ceci exemple , par exemple: conf fichier pubspec: fa_stepper: ^ 0.0.2, puis les packages flutter obtiennent, après cela: en utilisant le constructeur FAStepper pour définir quelque chose comme ceci:
Widget w1(BuildContext context) {
return Scaffold(
// Body
body: Container(
child: FAStepper(
// physics: ClampingScrollPhysics(),
// Using a variable here for handling the currentStep
currentStep: this.currentStep,
// List the steps you would like to have
titleHeight: 120,
steps: mySteps,
// Define the type of Stepper style
// StepperType.horizontal : Horizontal Style
// StepperType.vertical : Vertical Style
type: FAStepperType.horizontal,
titleIconArrange: FAStepperTitleIconArrange.column,
stepNumberColor: Colors.pinkAccent,
// Know the step that is tapped
onStepTapped: (step) {
// On hitting step itself, change the state and jump to that step
setState(() {
// update the variable handling the current step value
// jump to the tapped step
currentStep = step;
});
// Log function call
print("onStepTapped : " + step.toString());
},
onStepCancel: () {
// On hitting cancel button, change the state
setState(() {
// update the variable handling the current step value
// going back one step i.e subtracting 1, until its 0
if (currentStep > 0) {
currentStep = currentStep - 1;
} else {
currentStep = 0;
}
});
// Log function call
print("onStepCancel : " + currentStep.toString());
},
// On hitting continue button, change the state
onStepContinue: () {
setState(() {
// update the variable handling the current step value
// going back one step i.e adding 1, until its the length of the step
if (currentStep < mySteps.length - 1) {
currentStep = currentStep + 1;
} else {
currentStep = 0;
}
});
// Log function call
print("onStepContinue : " + currentStep.toString());
},
)),
);
}
Enveloppez le stepper avec un ConstrainedBox et définissez sa hauteur sur une constante et faites le StepperType comme horizontal. Vous pouvez le vérifier dans le dartpad.
return ConstrainedBox(
constraints: BoxConstraints.tightFor(height: 500.0),
child: Stepper(
type: StepperType.horizontal,
),
);
Il y a un problème à ce sujet sur github https://github.com/flutter/flutter/issues/40601
MAIS
C'est ce que j'utilise en ce moment
import 'package:flutter/material.Dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme:ThemeData(
primarySwatch:Colors.amber
),
debugShowCheckedModeBanner: false,
home: Scaffold(
body: Center(
child: MyWidget(),
),
),
);
}
}
class CustomStep {
final String title;
final Widget page;
CustomStep(
{@required this.title, @required this.page});
}
class MyWidget extends StatefulWidget {
const MyWidget({ Key key }) : super(key: key);
@override
_MyWidgetState createState() => _MyWidgetState();
}
class _MyWidgetState extends State<MyWidget> {
ScrollController _scrollController = new ScrollController();
static const double STEP_WIDTH = 90;
PageController pageController = PageController();
List<CustomStep> stepsList;
int currentPage=0;
@override
void initState() {
super.initState();
stepsList = [
CustomStep(
title: 'ddddd',
page: Placeholder(
color: Colors.pink,
),
),
CustomStep(
title: 'zzzzzzzz',
page: Placeholder(
color: Colors.deepPurple,
),
),
];
}
SizedBox buildStepDivider(int index) {
return SizedBox(
height: 90,
child: Container(
alignment: Alignment.topCenter,
child: Transform.translate(
offset: Offset(0, 16),
child: Container(
color: index < currentPage
? Theme.of(context).primaryColor
: Colors.grey,
width: 30,
height: 3,
padding: EdgeInsets.symmetric(horizontal: 10),
),
),
),
);
}
buildStep(int index) {
return Padding(
padding: const EdgeInsets.symmetric(horizontal: 5),
child: SizedBox(
height: 90,
width: STEP_WIDTH,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
decoration: BoxDecoration(
shape: BoxShape.circle,
color: index <= currentPage
? Theme.of(context).primaryColor
: Colors.grey[300],
),
padding: EdgeInsets.all(10),
child: Text((index + 1).toString()),
),
Expanded(
child: Text(
stepsList[index].title,
textAlign: TextAlign.center,
))
],
),
),
);
}
_buildStepper(int currentStep) {
Future.delayed(
Duration(milliseconds: 100),
() => _scrollController.animateTo((STEP_WIDTH * currentStep).toDouble(),
duration: const Duration(milliseconds: 300),
curve: Curves.easeOut));
return Center(
child: SizedBox(
height: 110,
child: ListView.builder(
controller: _scrollController,
shrinkWrap: true,
scrollDirection: Axis.horizontal,
itemCount: stepsList.length,
itemBuilder: (ctx, index) => index < stepsList.length - 1
? Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
buildStep(index),
buildStepDivider(index)
],
)
:Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
buildStep(index)]) ),
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('hello'), centerTitle: true),
body: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
_buildStepper(currentPage),
Expanded(
child: PageView.builder(
controller: pageController,
physics: NeverScrollableScrollPhysics(),
onPageChanged: (index) {
setState(() {
currentPage = index;
});
},
itemCount: stepsList.length,
itemBuilder: (ctx, index) =>
stepsList[index].page,
)),
],
),
);
}
}