As shown in the picture, I want to go directly to the corresponding list view when I press the button.
Instead of scrolling through the list, you can use the buttons to move left and right.
This is my current code.
As shown below, I am running a pageview called body (which changes briefly after using listview), and I know how to come out in order, but I don't know what to use to get it out of a specific number. Do you have a yes or another question?
GestureDetector(
onTap: () {
Navigator.push(context, MaterialPageRoute(builder: (context) => Choice821()),);
},
2
class Choice821 extends StatelessWidget {
#override
Widget build(BuildContext context) {
QuestionController _controller = Get.put(QuestionController());
return Scaffold(
appBar: AppBar(
title: Text('복습 시험', style: TextStyle(color: Colors.black, fontWeight:FontWeight.bold,fontSize: 20,),),
centerTitle: true,
elevation: 0,
),
body: Body(),
);
}
}
2
child: PageView.builder(
physics: NeverScrollableScrollPhysics(),
controller: _questionController.pageController,
onPageChanged: _questionController.updateTheQnNum,
itemCount: _questionController.questions.length,
itemBuilder: (context, index) => ayotube(
question: _questionController.questions[index],
id: _questionController.questionNumber.value,
),
),
You can simply do this:
// jump to page index with animation
_questionController.pageController.animateToPage(index);
// or jump to page index without animation
_questionController.pageController.jumpToPage(index);
Related
I have a list in my flutter app that displays some facts, I would like to make it so when I click any of the facts in the list, it animates, expands to a larger pop-up kind of screen that shows a the fact text and some buttons below like "save" inside the pop-up. Upon pressing "back" it should animate back to the list.
I have created an animation in a video editor to show the behavior I'm trying to achieve: https://drive.google.com/file/d/16GsJ1J89jn2CCVnuUecoy7VsF7BRdKF_/view?usp=sharing
Here's my build function currently:
// Main UI Build function
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: const PreferredSize(
preferredSize: Size.fromHeight(50), child: FactsAppBar()),
drawer: const FactsAppDrawer(),
body: GlowingOverscrollIndicator(
axisDirection: AxisDirection.down,
color: Theme.of(context).primaryColor,
child: ListView.separated(
// Render List View
itemCount: widgetsList
.length, // Set item count from the previously generated list
physics:
const AlwaysScrollableScrollPhysics(),
itemBuilder: (_, int index) =>
widgetsList[index], // Build items from the generated list
separatorBuilder: (_, div) => const Divider(
// Build separator between the items
thickness: 1.5,
),
),
));
}
Note: The widgetsList is a list of the facts generated during the screen load.
I use the get package, I have a bottom navigation that is updated with Obx. There is also a search for elements, at the top level of the pages everything is updated well, but when I do push, the current page is not updated, only when you call hot reload. There are suspicions that the nested page is not updated due to the fact that it goes beyond the BottomNavigation, and there is no Obx widget.
My Page Navigation controller:
Widget build(BuildContext context) {
SizeConfig().init(context);
final BottomPageController landingPageController =
Get.put(BottomPageController(), permanent: false);
return SafeArea(
child: Scaffold(
bottomNavigationBar:
BottomNavigationMenu(landingPageController: landingPageController),
body: Obx(
() => IndexedStack(
index: landingPageController.tabIndex.value,
children: [
ProductPage(),
MapPage(),
ClientPage(),
NotePage(),
],
),
),
),
);
}
My page where you need to update the ListView, depending on the entered value in the search bar:
class Product extends StatelessWidget {
#override
Widget build(BuildContext context) {
return GetX<ProductController>(
init: ProductController(),
builder: (controller) {
return FutureBuilder<List<ProductsCombined>>(
future: controller.filterProduct.value,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Expanded(
child: Container(
child: ListView.builder(
physics: BouncingScrollPhysics(),
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context, int index) =>
ProductCards(
product: snapshot.data[index],
),
),
),
);
} else {
return Center(child: CircularProgressIndicator());
}
},
);
},
);
}
}
There is also a nested page in the Product class, which is accessed in this way:
onTap: () => {
Get.toNamed(StoresScreen.routeName, arguments: companies)}
The Product class is updated immediately, you do not need to click Hot reload to do this, and the ProductScreen class that the transition is made to can no longer be updated, these 2 classes are completely identical. The search bar works, but it filters out the elements only after Hot reload.
If you need some other parts of my code, such as a controller that handles ListView, please write, I will attach it.
EDIT: I add a link to the video, with the screen that is not updated
Obx is a little tricky to work with. I always suggest to use GetX instead.
Try this :
Obx(
() => IndexedStack(
index: Get.find<BottomPageController>().tabIndex.value,
children: [
...
],
),
),
If it didn't work use GetX<BottomPageController> for this situation too. It works for all conditions
I am having a ListView, that is required to use pull to refresh function, and a floating header is needed on the design. Therefore I have tried to use the NestedScrollView to fulfill the task. However, I find that even if the list is short, as the SliverAppBar is floating, the body is always a bit longer to make the list able to scroll to hide the app bar which is not what expected on the our design flow.
The design flow considered is to
pin the appbar (not able to scroll) when the body is shorter than the available space
able to float app bar when list body is longer than the available space
I have tried to listen the scroll notification, but it seems not work as what i want to obtain. Please give me some suggestions if there is any way can solve this problem. Thank you!
The following is the code so far i have tried:
return Scaffold(
body: Builder(
builder: (context, ) {
return SafeArea(
child: NotificationListener<ScrollNotification>(
onNotification: (info){
debugPrint('scroll = ${info.metrics.pixels}');
bool isFloat = info.metrics.pixels>57.0;
if(_isFloat!=isFloat){
_isFloat= isFloat;
WidgetsBinding.instance?.addPostFrameCallback((timeStamp) {
setState((){});
});
}
return true;
},
child: NestedScrollView(
floatHeaderSlivers: false,
headerSliverBuilder: (context, isInnerScroll) {
return [
SliverAppBar(
title: Text('Demo'),
floating: _isFloat,
pinned: !_isFloat,
),
];
},
body: SmartRefresher(
controller: _refreshController,
onRefresh: () {
Future.delayed(Duration(milliseconds: 1000), () {
_refreshController.refreshCompleted();
});
},
child: ListView.builder(
itemCount: 5,
itemBuilder: (context, index) {
return ListTile(
title: Text('$index'),
);
},
),
),
),
),
);
}
),
);
I need help to do the following: when I press List 1, the screen focuses on List 1; I need the same for the rest of the options
This is the code for the example:
code
This behavior already exists in web pages but I haven't found this same behavior at the mobile app level. Thank you
Here is a small code snippet of something similar which might help you achieve you desired results.
By clicking the fab icon it will scroll down to item 35 within the ListView.
class MyHomePage extends StatelessWidget {
final _scrollController = ScrollController();
final _cardHeight = 200.0;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
floatingActionButton: FloatingActionButton(
backgroundColor: Colors.orange,
onPressed: () => _animateToIndex(35),
child: Icon(Icons.add),
),
body: ListView.builder(
controller: _scrollController,
itemCount: 100,
itemBuilder: (_, i) => Container(
height: _cardHeight,
child: Card(
color: Colors.lightBlue,
child: Center(
child: Text("Scroll Item $i", style: TextStyle(fontSize: 28.0),),
),
),
),
),
);
}
_animateToIndex(index) {
_scrollController.animateTo(_cardHeight * index,
duration: Duration(seconds: 1), curve: Curves.fastOutSlowIn);
}
}
You'll need to have a scrollable Widget (like ListView, SingleScrollableWidget) instead of a Column in ListSecondPage.
Then add a ScrollController to it and ListSecondPage should receive which button was tapped. Based on that selection you can scroll to the desired location with the ScrollController
What is the alternative to Recycle view in flutter I have tried using this code
but how to do Animination with listview widget in flutter
Is this valid?
ListView(
children: <Widget>[
ListTile(
leading: Icon(Icons.map),
title: Text('Map'),
),
ListTile(
leading: Icon(Icons.photo_album),
title: Text('Album'),
),
ListTile(
leading: Icon(Icons.phone),
title: Text('Phone'),
),
],
);
ListView:
Usually this should be used with a small number of children as the List will also construct the invisible elements in the list and a large amount of elements may render this inefficient.
ListView.builder():
The list items are constructed lazily, meaning only a specific number of list items are constructed and when a user scrolls ahead, the earlier ones are destroyed.
More info is here.
Following flutter-for/android-devs
The recommended, efficient, and effective way to build a list uses a
ListView.Builder. This method is great when you have a dynamic List or
a List with very large amounts of data. This is essentially the
equivalent of RecyclerView on Android, which automatically recycles
list elements for you:
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Sample App"),
),
body: ListView.builder(
itemCount: widgets.length,
itemBuilder: (BuildContext context, int position) {
return getRow(position);
}));
}
Widget getRow(int i) {
return GestureDetector(
child: Padding(
padding: EdgeInsets.all(10.0),
child: Text("Row $i")),
onTap: () {
setState(() {
widgets.add(getRow(widgets.length + 1));
print('row $i');
});
},
);
}
You can also use animatedlist widget for animations. code example are given in the following link.
AnimatedList