Develop Reference

How to get dynamically FormFiledWidget values on button click in flutter

I want to get all the input field values from the listTilewidget on the button click how can I do this?
I have provided the image as well which is here...
we can easily do this with this javascript but is there any way to achieve this type of functionality?
I looked for the solution to this problem on the internet but did not find any solution for that problem.
FutureBuilder(
future: SupervisorAttendanceServices.getAttendancesDetailsList(
widget.attendanceId),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.hasData) {
var data = snapshot.data['hamal'];
return ListView.builder(
itemCount: data.length,
physics: const NeverScrollableScrollPhysics(),
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return Card(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(children: [
Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.start,
children: [
const SizedBox(
width: 10,
height: 50,
),
const Icon(FeatherIcons.user),
const SizedBox(
width: 20,
),
Text(
data[index]['worker_name'],
style: const TextStyle(fontSize: 18),
),
],
),
Row(
mainAxisAlignment:
MainAxisAlignment.start,
children: [
SizedBox(
width: 150,
height: 50,
child: TextFormField(
cursorHeight: 25,
controller: _mainWagesController,
// onChanged: _onChangeHandler,
// initialValue: _mainWagesController.text,
decoration: const InputDecoration(
border: OutlineInputBorder(),
hintText: "Wages",
prefixIcon: Icon(
Icons.wallet,
color: Colors.blue,
)),
)),
],
)
]),
),
);
});
} else if (snapshot.hasError) {
return const Center(
child: Text("Something went wrong !"),
);
} else {
return const Center(child: LinearProgressIndicator());
}
},
),

Flutter Nested ListView in FutureBuilder with CheckboxListTyle Returns Constraint Error

Hello so the problem i am having is the following code
return Scaffold(
body: Padding(
padding: EdgeInsets.all(20),
child: Row(
children: [
const SizedBox(width: 15),
Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(widget.routine.title!, style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20)),
SizedBox(height: 6),
Text(widget.routine.description!),
const Divider(
height: 10,
thickness: 2,
indent: 20,
endIndent: 0,
color: Colors.white,
),
FutureBuilder<List<RoutineTask>>(
future: _getRoutineTasks(widget.routine.id!),
builder: (BuildContext context, AsyncSnapshot<List<RoutineTask>> snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if(snapshot.data == null) {
return Center(
child: Text("No Tasks!"),
);
} else if (snapshot.hasError) {
return Center(
child: Text("An Error has Occured: ${snapshot.error}"),
);
} else {
return ListView.separated(
reverse: false,
itemCount: snapshot.data!.length,
scrollDirection: Axis.vertical,
shrinkWrap: true,
separatorBuilder: (BuildContext context, index) => const Divider(),
itemBuilder: (BuildContext context, index) {
return Container(
height: MediaQuery.of(context).size.height * 0.45,
decoration: BoxDecoration(
color: Colors.blue,
borderRadius: BorderRadius.circular(25)
),
child: CheckboxListTile(
value: snapshot.data![index].isComplete,
onChanged: (bool? value) {
setState(() {
snapshot.data![index].isComplete = value;
});
},
),
);
},
);
}
} else {
return Center(child: CircularProgressIndicator(),);
}
}
)
],
),
],
)),
);
is Returning the error
'package:flutter/src/rendering/viewport.dart': Failed assertion: line 1869 pos 16: 'constraints.hasBoundedWidth': is not true.
and i have no idea how to fix it, been trying every possible combination i can come up with.

Edited: This works. Try to follow this tree structure.
return Scaffold(
body: Row(
children:[
Text('ROWWWWWWWWWWW'),
Expanded(
child: Column(
children:[
Text('COLUMN'),
Expanded(
child: ListView(
children:[
Text('LISTVIEW'),
],
),
),
]
),
)
],
),
);

Why does my widget get squished when the keyboard appears?

The chatScreen holds the receivedChats (top) and the msgInput (bottom) widgets. For some reason, the words "Write message..." go outside of their text input widget and I'm not sure why.
chatScreen:
#override
Widget build(BuildContext context) {
final groupIDPath = 'groupChats/path';
return Scaffold(
appBar: AppBar(
title: Text('Group Chat Screen'),
backgroundColor: Color.fromRGBO(102, 204, 125, 1.0),
elevation: 0.0,
),
body: Column(
children: [
Expanded(
flex: 8,
child: Row(
children: [
Expanded(
child: ReceivedChats(groupIDPath: groupIDPath),
),
],
),
),
Expanded(
flex: 2,
child: Row(
children: [
Expanded(
child: MsgInput(groupIDPath: groupIDPath),
)
],
),
)
],
)
);
}
receivedChats:
#override
Widget build(BuildContext context) {
final messageDao = MessageDao(groupIDPath: widget.groupIDPath);
var msg;
return Scaffold(
body: Container(
child: ListView.builder(
itemCount: data?.length ?? 0,
itemBuilder: (context, index) {
data?.forEach((key, value) {
msg = Message.fromJson(value);
dataList?.add(msg);
});
if (dataList?[index] == null) {
return Text('');
} else {
return messageDao.messageWidget(dataList?[index].type, dataList?[index].uid, dataList?[index].text);
}
}
),
)
);
}
msgInput:
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: [
Expanded(
flex: 3,
child: Row(
children: [
Expanded(
child: Container(color: Colors.blue,)
),
],
),
),
Expanded(
flex: 1,
child: Row(
children: [
Expanded(
flex: 10,
child: TextField(
controller: messageController,
decoration: InputDecoration(
hintText: "Write message...",
)
)
),
Expanded(
flex: 3,
child: Container(color: Colors.green,)
)
],
),
),
],
),
);
}

Wrap your Scaffold body with SingleChildScrollView, i think its better to use in chatScreen:
return Scaffold(
body: SingleChildScrollView(
child: ...
),
);
or give resizeToAvoidBottomPadding: false to Scaffold to avoid this problem
read about SingleChildScrollView

Flutter : How to prevent rebuild of whole Reorderable Listview?

Currently I'm using flutter package 'Reorderables' to show a reorderable listview which contains several images.These images can be deleted from listview through a button , everything works fine. But the listview rebuild everytime when I delete an image. I'm using a class called 'ReorderableListviewManager' with ChangeNotifier to update images and Provider.of<ReorderableListviewManager>(context) to get latest images . The problem now is that using Provider.of<ReorderableListviewManager>(context) makes build() called everytime I delete an image , so the listview rebuid. I koow I
can use consumer to only rebuild part of widget tree, but it seems like that there's no place to put consumer in children of this Listview. Is there a way to rebuild only image but not whole ReorderableListview ? Thanks very much!
Below is my code:
class NotePicturesEditScreen extends StatefulWidget {
final List<Page> notePictures;
final NotePicturesEditBloc bloc;
NotePicturesEditScreen({#required this.notePictures, #required this.bloc});
static Widget create(BuildContext context, List<Page> notePictures) {
return Provider<NotePicturesEditBloc>(
create: (context) => NotePicturesEditBloc(),
child: Consumer<NotePicturesEditBloc>(
builder: (context, bloc, _) =>
ChangeNotifierProvider<ReorderableListviewManager>(
create: (context) => ReorderableListviewManager(),
child: NotePicturesEditScreen(
bloc: bloc,
notePictures: notePictures,
),
)),
dispose: (context, bloc) => bloc.dispose(),
);
}
#override
_NotePicturesEditScreenState createState() => _NotePicturesEditScreenState();
}
class _NotePicturesEditScreenState extends State<NotePicturesEditScreen> {
PreloadPageController _pageController;
ScrollController _reorderableScrollController;
List<Page> notePicturesCopy;
int longPressIndex;
List<double> smallImagesWidth;
double scrollOffset = 0;
_reorderableScrollListener() {
scrollOffset = _reorderableScrollController.offset;
}
#override
void initState() {
Provider.of<ReorderableListviewManager>(context, listen: false)
.notePictures = widget.notePictures;
notePicturesCopy = widget.notePictures;
_reorderableScrollController = ScrollController();
_pageController = PreloadPageController();
_reorderableScrollController.addListener(_reorderableScrollListener);
Provider.of<ReorderableListviewManager>(context, listen: false)
.getSmallImagesWidth(notePicturesCopy, context)
.then((imagesWidth) {
smallImagesWidth = imagesWidth;
});
super.initState();
}
#override
void dispose() {
_pageController.dispose();
_reorderableScrollController.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
ReorderableListviewManager reorderableManager =
Provider.of<ReorderableListviewManager>(context, listen: false);
return SafeArea(
child: Scaffold(
appBar: AppBar(
backgroundColor: Colors.white,
shape: Border(bottom: BorderSide(color: Colors.black12)),
iconTheme: IconThemeData(color: Colors.black87),
elevation: 0,
automaticallyImplyLeading: false,
titleSpacing: 0,
centerTitle: true,
title: Row(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Container(
child: IconButton(
padding: EdgeInsets.only(left: 20, right: 12),
onPressed: () => Navigator.of(context).pop(),
icon: Icon(Icons.close),
),
),
Text('編輯',
style: TextStyle(color: Colors.black87, fontSize: 18))
],
),
actions: <Widget>[
FlatButton(
onPressed: () {},
child: Text(
'下一步',
),
)
],
),
backgroundColor: Color(0xffeeeeee),
body: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Spacer(),
StreamBuilder<List<Page>>(
initialData: widget.notePictures,
stream: widget.bloc.notePicturesStream,
builder: (context, snapshot) {
notePicturesCopy = snapshot.data;
return Container(
margin: EdgeInsets.symmetric(horizontal: 20),
height: MediaQuery.of(context).size.height * 0.65,
child: PreloadPageView.builder(
preloadPagesCount: snapshot.data.length,
controller: _pageController,
itemCount: snapshot.data.length,
onPageChanged: (index) {
reorderableManager.updateCurrentIndex(index);
reorderableManager.scrollToCenter(
smallImagesWidth,
index,
scrollOffset,
_reorderableScrollController,
context);
},
itemBuilder: (context, index) {
return Container(
child: Image.memory(
File.fromUri(
snapshot.data[index].polygon.isNotEmpty
? snapshot.data[index]
.documentPreviewImageFileUri
: snapshot.data[index]
.originalPreviewImageFileUri)
.readAsBytesSync(),
gaplessPlayback: true,
alignment: Alignment.center,
),
);
}),
);
},
),
Spacer(),
Container(
height: MediaQuery.of(context).size.height * 0.1,
margin: EdgeInsets.symmetric(horizontal: 20),
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: ReorderableRow(
scrollController: _reorderableScrollController,
buildDraggableFeedback: (context, constraints, __) =>
Container(
width: constraints.maxWidth,
height: constraints.maxHeight,
child: Image.memory(File.fromUri(
notePicturesCopy[longPressIndex]
.polygon
.isNotEmpty
? notePicturesCopy[longPressIndex]
.documentPreviewImageFileUri
: notePicturesCopy[longPressIndex]
.originalPreviewImageFileUri)
.readAsBytesSync()),
),
onReorder: (oldIndex, newIndex) async {
List<Page> result = await widget.bloc.reorderPictures(
oldIndex,
newIndex,
reorderableManager.notePictures);
_pageController.jumpToPage(newIndex);
reorderableManager.updateNotePictures(result);
reorderableManager
.getSmallImagesWidth(result, context)
.then((imagesWidth) {
smallImagesWidth = imagesWidth;
});
},
footer: Container(
width: 32,
height: 32,
margin: EdgeInsets.only(left: 16),
child: SizedBox(
child: FloatingActionButton(
backgroundColor: Colors.white,
elevation: 1,
disabledElevation: 0,
highlightElevation: 1,
child: Icon(Icons.add, color: Colors.blueAccent),
onPressed: notePicturesCopy.length >= 20
? () {
Scaffold.of(context)
.showSnackBar(SnackBar(
content: Text('筆記上限為20頁 !'),
));
}
: () async {
List<Page> notePictures =
await widget.bloc.addPicture(
reorderableManager.notePictures);
List<double> imagesWidth =
await reorderableManager
.getSmallImagesWidth(
notePictures, context);
smallImagesWidth = imagesWidth;
reorderableManager.updateCurrentIndex(
notePictures.length - 1);
reorderableManager
.updateNotePictures(notePictures);
_pageController
.jumpToPage(notePictures.length - 1);
},
),
),
),
children: Provider.of<ReorderableListviewManager>(
context)
.notePictures
.asMap()
.map((index, page) {
return MapEntry(
index,
Consumer<ReorderableListviewManager>(
key: ValueKey('value$index'),
builder: (context, manager, _) =>
GestureDetector(
onTapDown: (_) {
longPressIndex = index;
},
onTap: () {
reorderableManager.scrollToCenter(
smallImagesWidth,
index,
scrollOffset,
_reorderableScrollController,
context);
_pageController.jumpToPage(index);
},
child: Container(
margin: EdgeInsets.only(
left: index == 0 ? 0 : 12),
decoration: BoxDecoration(
border: Border.all(
width: 1.5,
color: index ==
manager
.getCurrentIndex
? Colors.blueAccent
: Colors.transparent)),
child: index + 1 <=
manager.notePictures.length
? Image.memory(
File.fromUri(manager
.notePictures[
index]
.polygon
.isNotEmpty
? manager
.notePictures[
index]
.documentPreviewImageFileUri
: manager
.notePictures[
index]
.originalPreviewImageFileUri)
.readAsBytesSync(),
gaplessPlayback: true,
)
: null),
),
));
})
.values
.toList()),
)),
Spacer(),
Container(
decoration: BoxDecoration(
color: Colors.white,
border: Border(top: BorderSide(color: Colors.black12))),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
FlatButton(
onPressed: () async => await widget.bloc
.cropNotePicture(reorderableManager.notePictures,
_pageController.page.round())
.then((notePictures) {
reorderableManager.updateNotePictures(notePictures);
reorderableManager
.getSmallImagesWidth(notePictures, context)
.then((imagesWidth) {
smallImagesWidth = imagesWidth;
});
}),
child: Column(
children: <Widget>[
Icon(
Icons.crop,
color: Colors.blueAccent,
),
Container(
margin: EdgeInsets.only(top: 1),
child: Text(
'裁切',
style: TextStyle(color: Colors.blueAccent),
),
)
],
),
),
FlatButton(
onPressed: () {
int deleteIndex = _pageController.page.round();
widget.bloc
.deletePicture(
reorderableManager.notePictures, deleteIndex)
.then((notePictures) {
if (deleteIndex == notePictures.length) {
reorderableManager
.updateCurrentIndex(notePictures.length - 1);
}
reorderableManager.updateNotePictures(notePictures);
reorderableManager
.getSmallImagesWidth(notePictures, context)
.then((imagesWidth) {
smallImagesWidth = imagesWidth;
});
if (reorderableManager.notePictures.length == 0) {
Navigator.pop(context);
}
});
},
child: Column(
children: <Widget>[
Icon(
Icons.delete_outline,
color: Colors.blueAccent,
),
Container(
margin: EdgeInsets.only(top: 1),
child: Text(
'刪除',
style: TextStyle(color: Colors.blueAccent),
),
),
],
),
)
],
),
)
],
)),
);
}
}

You can't prevent a rebuild on your ReorderableListView widget because it will be rebuild every time there's an update on the Provider. What you can do here is to keep track the current index of all visible ListView items. When new data should be displayed coming from the Provider, you can retain the current indices of previous ListView items, and add the newly added items at the end of the list, or wherever you like.

Flutter : Grid View inside list view

I have tried :
ListView.builder(
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return GridView.count(
crossAxisCount: 5,
children: List.generate(10, (index) {
return Center(
child: Text(
'$index AM',
),
);
}),
);
},
itemCount: partnerArr.length,
)
I want to make this type of list view in my Scaffold body, how can I do so?

You can try this Code:
#override
Widget build(BuildContext context) {
return Scaffold(
body: ListView.separated(
separatorBuilder: (context, int) {
return Divider(color: Colors.black,);
},
// shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return GridView.count(
shrinkWrap: true,
crossAxisCount: 3,
childAspectRatio: 2.0,
children: List.generate(6, (index) {
return Center(
child: RaisedButton(
onPressed: (){},
color: Colors.greenAccent,
child: Text(
'$index AM',
),
),
);
}),
);
},
itemCount: 4,
));
}
Output:

use CustomScrollView
CustomScrollView(
slivers: List.generate(
10,
(item) => SliverGrid(
gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
maxCrossAxisExtent: 150.0,
mainAxisSpacing: 10.0,
crossAxisSpacing: 10.0,
childAspectRatio: 4.0,
),
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container(
alignment: Alignment.center,
color: Colors.amber[100 * (index % 9)],
child: Text('grid item $index'),
);
},
childCount: 6,
),
)),
)

import 'package:flutter/material.dart';
class SubmitRequest extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return _SubmitRequest();
}
}
class _SubmitRequest extends State<SubmitRequest> {
#override
Widget build(BuildContext context) {
return new Scaffold(
drawer: Drawer(
child: Container(
color: Colors.black54,
child: ListView(
padding: EdgeInsets.only(top: 40.0),
children: <Widget>[
ListTile(
title: Text('Dashboard'),
),
ListTile(
title: Text('Submit Reports'),
),
ListTile(
title: Text('Inbox Requests'),
),
],
),
),
),
appBar: AppBar(
backgroundColor: Colors.blue,
leading: IconButton(icon: Icon(Icons.menu), onPressed: () {}),
actions: <Widget>[
// IconButton(icon: Icon(Icons.search), onPressed: () {}),
IconButton(icon: Icon(Icons.help), onPressed: () {}),
],
bottom: PreferredSize(
child: Padding(
padding: const EdgeInsets.fromLTRB(0.0, 0.0, 15.0, 16.0),
child: Container(
margin: EdgeInsets.only(left: 16.0),
child: TextField(
decoration: new InputDecoration(
suffixIcon: IconButton(
icon: Icon(Icons.search),
onPressed: () {
debugPrint('222');
}),
border: new OutlineInputBorder(
borderRadius: const BorderRadius.all(
const Radius.circular(50.0),
),
),
filled: true,
hintStyle: new TextStyle(color: Colors.grey[800]),
hintText: "Search",
fillColor: Colors.white),
),
),
),
preferredSize: Size(0.0, 80.0),
),
),
body: Scaffold(
body: ListView.builder(
// separatorBuilder: (context, int) {
// return Divider(color: Colors.black,);
// },
// shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return GridView.count(
shrinkWrap: true,
crossAxisCount: 4,
childAspectRatio: 1.0,
children: List.generate(6, (index) {
return GridTile(
child: new Card(
color: Colors.blue.shade100,
child: new Center(
child: new Text('Exterior $index'),
),
),
);
}),
);
},
itemCount: 4,
)
)
);
}
}