I need a Function to make the swiper go to the first index I have
I am using card_swiperpackage
Swiper(
loop: true,
itemCount: 2,
itemBuilder: (context, index) {
return Image.asset(index == 0
? blackImages[imageNumber].imagePath
: blackImages[imageNumber].imagePath1);
},
),
am just using setState for state management
Use a SwiperController
final controller = SwiperController();
.....
Swiper(
controller: controller,
and to move 1st index use , no need to call setState
controller.move(0);
Test snippet
#override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: () {
controller.move(0);
},
),
body: Column(
children: [
Swiper(
controller: controller,
loop: true,
itemCount: 2,
itemBuilder: (context, index) {
return Container(
color: index.isEven ? Colors.red : Colors.blue,
);
},
),
],
),
);
Related
This is the code where the error occurred using GetX. If anyone want to help thanks for advance
body: SafeArea(
child: Column(
children: [
Expanded(
child: GetX<CustomerController> (
builder: (customerController) {
return ListView.builder(
itemCount: customerController.count,
itemBuilder: (context, index) {
return ListTile(
selectedTileColor:Colors.blueGrey.shade50,
title: Text(customerController.results.string),
);
});
},
),
)
],
),
),
Create a GetX Controller and then assign it to your GetX Widget
GetX<ControllerName>(
builder: (customerController) {
return ListView.builder(
itemCount: customerController.controllervalueinobx.length, //should be obx/Rx type variable
itemBuilder: (context, index) {
return ListTile(
selectedTileColor: Colors.blueGrey.shade50,
title: Text(
"customerController.results.string",
), );
});
},
),
i want to add a row ( list of buttons that do filter the list), i tried wrapping listTile in column, listview.builde in column but it doesn't work. tried wrapping GetBuilder also but it doesn't work.
enter image description here
My Code :-
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:quizzy/data_controller.dart';
import '../models/showQuestion.dart';
class AllQuestionBank extends StatefulWidget {
const AllQuestionBank({Key? key}) : super(key: key);
#override
State<AllQuestionBank> createState() => _AllQuestionBankState();
}
class _AllQuestionBankState extends State<AllQuestionBank> {
final DataController controller = Get.put(DataController());
#override
Widget build(BuildContext context) {
WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
controller.getQuestionList();
});
return Scaffold(
appBar: AppBar(
title: const Text(' Question Bank'),
),
body: GetBuilder<DataController>(
builder: (controller) => controller.QuestionList.isEmpty
? const Center(
child: Text('😔 NO DATA FOUND (: 😔'),
)
: ListView.builder(
itemCount: controller.QuestionList.length,
itemBuilder: (context, index) {
return ListTile(
title: showQuestion(controller.QuestionList[index]),
);
}),
),
);
}
}
You could redefine your ListView as:
ListView.builder(
itemCount: controller.QuestionList.length + 1,
itemBuilder: (context, index) {
if (index == 0) {
return WhateverRowYouWant();
}
return ListTile(
title: showQuestion(controller.QuestionList[index - 1]),
);
}),
You can just define the scroll direction to be horizontal.
ListView.builder(
itemCount: controller.QuestionList.length,
scrollDirection: Axis.horizontal, <- added this line
itemBuilder: (context, index) {
return ListTile(
title: showQuestion(controller.QuestionList[index]),
);
}),
You can also find an example from the official docs here
Try this.
physics: NeverScrollableScrollPhysics(), shrinkWrap: true,
To add Row() on top you need Column() widget for sure
After that, you have to wrap ListView.builder() with the Expanded() widget this will help you
Ex.
return Scaffold(
body: SafeArea(
child: Column(
children: [
Row(
children: [
TextButton(
onPressed: () {},
child: Text('Filter'),
),
],
),
Expanded(
child: GetBuilder<DataController>(
builder: (controller) => controller.QuestionList.isEmpty
? const Center(
child: Text('😔 NO DATA FOUND (: 😔'),
)
: ListView.builder(
shrinkWrap: true,
itemCount: controller.QuestionList.length,
itemBuilder: (context, index) {
return ListTile(
title: showQuestion(controller.QuestionList[index]),
);
},
),
),
),
],
),
),
);
Please, try this!!
This is the combination of GetxController and ListView with a top row I use:
class MyController extends GetxController {
var isRunning = true.obs; // set to isRunning.value = false; if done loading QuestionList
RxList<ProductModel> QuestionList = <ProductModel>[].obs;
}
Obx( () => controller.isRunning.isTrue
? 'Loading'
: ListView.builder(
itemCount: controller.QuestionList.length + 1,
itemBuilder: (BuildContext context, int index) {
if (index == 0) {
return Text('TOP ROW');
}
return ListTile(
title: showQuestion(controller.QuestionList[index - 1]),
);
}),
);
I'm creating a chat feature in flutter but noticed this behavior on IOS that doesnt shrink the list so you can see the last sent message. How can I have the listview builder shrink to show the last message when the keyboard appears?
Note: This issue doesn't happen on Android
Scaffold(
resizeToAvoidBottomInset: true,
body: Stack(
children: <Widget>[
StreamBuilder(
stream: _chats,
builder: (context, snapshot) {
if (!snapshot.hasData) return Container();
return snapshot.hasData
? GestureDetector(
onPanDown: (_) {
FocusScope.of(context).requestFocus(FocusNode());
},
child: ListView.builder(
shrinkWrap: true,
controller: _scrollController,
padding: EdgeInsets.only(top: 10, bottom: 100),
itemCount: snapshot.data.docs.length,
itemBuilder: (context, index) {
return MessageWidget(
tripId: widget.docId,
uid: snapshot.data.docs[index].data()["uid"],
messageId: snapshot.data.docs[index].id,
message: snapshot.data.docs[index].data()["message"],
sender: snapshot.data.docs[index].data()["senderName"],
sentByMe: widget.uid ==
snapshot.data.docs[index].data()["uid"],
mediaFileUrl:
snapshot.data.docs[index].data()["mediaFileUrl"],
);
}),
)
: Container();
},
);
]
)
)
I think you can try the 'reverse' property from the ListView.builder.
Tell me if this example didn't fit your needs, can you share us your code ? (I didn't see why you use a Stack and what could be the issue around that).
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: <Widget>[
Expanded(
child: Stack(
children: <Widget>[
StreamBuilder<dynamic>(
builder: (context, dynamic snapshot) {
return GestureDetector(
onPanDown: (_) {
FocusScope.of(context).unfocus();
},
child: ListView.builder(
reverse: true,
shrinkWrap: true,
itemCount: 100,
padding: const EdgeInsets.only(top: 10, bottom: 10),
itemBuilder: (context, index) {
return ListTile(title: Text(index.toString()));
},
),
);
},
),
],
),
),
Container(
padding: const EdgeInsets.all(8),
color: Colors.black12,
child: const TextField(),
),
],
),
);
}
}
I have checkbox for selecting and deselecting photos.
There is a visible loading screen for each tap.
_mediaList has the photo asset. mediaModel has the necessary methods to add and remove the path of selected and deselected photos respectively.
Widget build(BuildContext context) {
super.build(context);
return GridView.builder(
itemCount: _mediaList.length,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3, mainAxisSpacing: 4.0, crossAxisSpacing: 4.0),
itemBuilder: (BuildContext context, int index) {
final saved = mediaModel.getMedia().contains(
_mediaList[index].relativePath + '/' + _mediaList[index].title);
return FutureBuilder(
future: _mediaList[index].thumbDataWithSize(200, 200),
builder: (BuildContext context, snapshot) => snapshot.hasData
? GridTile(
header: saved
? Icon(Icons.check_circle, color: Colors.white,)
: Icon(Icons.check_circle_outline, color: Colors.white,),
child: GestureDetector(
child: Image.memory(
snapshot.data,
fit: BoxFit.cover,
),
onTap: () => setState(() => saved
? mediaModel.removeMedia(
_mediaList[index].relativePath +
'/' +
_mediaList[index].title)
: mediaModel.addMedia(
_mediaList[index].relativePath +
'/' +
_mediaList[index].title))),
)
: Container());
},
);
}
EDIT: After some analysis, I found out using Provider to load images might be the right way.
Can you help me in converting this code to Provider?
Thanks in advance!!!
Screenshot:
Full code:
class FooPage extends State<SoPage> {
static const int _count = 10;
final List<bool> _checks = List.generate(_count, (_) => false);
#override
Widget build(BuildContext context) {
return Scaffold(
body: GridView.builder(
itemCount: _count,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemBuilder: (_, i) {
return Stack(
children: [
Container(color: Colors.red[(i * 100) % 900]),
Align(
alignment: Alignment.topCenter,
child: Checkbox(
value: _checks[i],
onChanged: (newValue) => setState(() => _checks[i] = newValue),
),
),
],
);
},
),
);
}
}
I have widget which return CircularProgressIndicator()
it shows on the circular mark upper left of screen.
However I want to put this as overlay and put at the center of screen.
I am checking widget list but I cant find what Widget should I use as overlay.
On which layer should I put this on??
For now my code is like this ,when loading it shows CircularProgressIndicator instead of ListView
However I want to put CircularProgressIndicator() on ListView
Widget build(BuildContext context) {
if(loading) {
return CircularProgressIndicator();
}
return ListView.builder(
controller: _controller,
itemCount: articles.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(articles[index]),
);
},
);
}
Thank you very much for answers.
I solve with stack Widget like this below.
At first I try to use overlay, but I bumped into some errors.
So, I use simply stack.
#override
Widget build(BuildContext context) {
Widget tempWidget = new CircularProgressIndicator();
if(loading) {
tempWidget = new CircularProgressIndicator();
}
else {
tempWidget = new Center();//EmptyWidget
}
return Stack(
children: <Widget>[
ListView.builder(
controller: _controller,
itemCount: articles.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(articles[index].title),
onTap: () => onTapped(context,articles[index].url),
);
},
),
Center(
child: tempWidget
),
]
);
}
Stack(
children: <Widget>[
ListView.builder(
itemBuilder: (BuildContext context, int index) {
return Container(
height: 100,
color: Colors.red,
);
},
itemCount: 10,
),
Center(
child: CircularProgressIndicator(),
),
],
)
Stack(
children: <Widget>[
ListView.builder(
itemBuilder: (BuildContext context, int index) {
return Container(
height: 100,
color: Colors.red,
);
},
itemCount: 10,
),
isLoading? Container(child: Center(
child: CircularProgressIndicator(),
)): Container(), //if isLoading flag is true it'll display the progress indicator
],
)
or you can use futureBuilder or streamBuilder when loading data from somewhere and you want to change the ui depending on the state
To overlay or position items on top of each other you would usually use a Stack widget or Overlay as described here. For your usecase I would recommend checking out the modal progress hud package.