How to scroll or jump to position of PageView.builder or PageController in Flutter? - scroll

Question

Issue: Unable to scroll to POSITION after loading the Pageviews using PageController *
like ViewPager scroll to specific page in Android
Widget _buildCarousel(BuildContext context, int selectedIndex) {
PageController controller = PageController(viewportFraction: 1, keepPage: true);
return Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
SizedBox(
// you may want to use an aspect ratio here for tablet support
height: 400.0,
width: 240,
child: PageView.builder(
itemCount: assetImageList.length,
controller: controller,
itemBuilder: (BuildContext context, int itemIndex) {
return _buildCarouselItem(context, selectedIndex, itemIndex);
},
),
)
],
);
}

Answer 1

Finally found the answer. Just set the initialPage: mSelectedPosition attribute like:
child: PageView.builder(
itemCount: mTemplateModelList.length,
controller: PageController(initialPage: mSelectedPosition, keepPage: true, viewportFraction: 1),
itemBuilder: (BuildContext context, int itemIndex) {
return _buildCarouselItem(context, selectedIndex, itemIndex);
},
),
OR if you want to scroll the page after the button is clicked then, you can use jumpTo() method using PageController which is clearly mentioned below by another user: #android.

Answer 2

Currently there's 2 options to handle your request:
PageView.builder(
controller: _pageController,
itemCount: _list.length,
itemBuilder: (context, index) {
return GestureDetector(
onTap: () {
_pageController.jumpToPage(index); // for regular jump
_pageController.animateToPage(_position, curve: Curves.decelerate, duration: Duration(milliseconds: 300)); // for animated jump. Requires a curve and a duration
},
child: Container();
);
}
),

Answer 3

You can use jumpTo() method to scroll position for PageView.
I have create one changePageViewPostion() method in below example:
import 'package:flutter/material.dart';
class MyPageView extends StatefulWidget {
createState() {
return StateKeeper();
}
}
class StateKeeper extends State<MyPageView> {
PageController controller = PageController(viewportFraction: 1, keepPage: true);
var currentPageValue = 0.0;
var mItemCount = 10;
#override
void initState() {
// TODO: implement initState
super.initState();
controller.addListener(() {
setState(() {
currentPageValue = controller.page;
});
});
}
void changePageViewPostion(int whichPage) {
if(controller != null){
whichPage = whichPage + 1; // because position will start from 0
double jumpPosition = MediaQuery.of(context).size.width / 2;
double orgPosition = MediaQuery.of(context).size.width / 2;
for(int i=0; i<mItemCount; i++){
controller.jumpTo(jumpPosition);
if(i==whichPage){
break;
}
jumpPosition = jumpPosition + orgPosition;
}
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('PageView position change'),
),
body: PageView.builder(
controller: controller,
itemBuilder: (context, position) {
return Container(
color: position % 2 == 0 ? Colors.blue : Colors.pink,
child: Column(
children: <Widget>[
Center(
child: Text(
"Page " + (position + 1).toString(),
style: TextStyle(color: Colors.white, fontSize: 22.0),
),
),
Align(
alignment: FractionalOffset.bottomCenter,
child: Padding(padding: EdgeInsets.only(bottom: 20),
child: FloatingActionButton(
elevation: 0.0,
child: new Icon(Icons.check),
backgroundColor: new Color(0xFFE57373),
onPressed: (){
changePageViewPostion(5);
}
),),
),
],
),
);
},
itemCount: mItemCount,
)
);
}
}
We can get current position with controller as below:
controller.addListener(() {
setState(() {
currentPageValue = controller.page.toInt();
print((currentPageValue + 1).toString());
});
});
Hope it helps :)

Answer 4

If you just want to scroll to the next page using a button, you can simply use the following method.
//Create a PageController variable
late PageController _pageController;
//Initialize the variable in the init method.
#override
void initState() {
_pageController = PageController(
initialPage: _activePage, keepPage: true, viewportFraction: 1);
super.initState();
}
//Use this nextPage() method in the onPressed() method.
onPressed: () {
setState(() {
_activePage < 2
? _activePage++
: Navigator.pushReplacementNamed(
context, LoginScreen.id);
});
_pageController.nextPage(
duration: const Duration(milliseconds: 300),
curve: Curves.decelerate,
);
}