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I have a problem with ListView. I need to make it scrollable and set its size to max space it can take. Below listView I have a button that should be visible, but the ListView covers it.
I tried solutions from similar topics:
put ListView into SingleChildScrollView
make ListView Expanded
So the problem is:
how to make this listView scrollable?
how can I set its size to max as it can take (I mean it should be between 'List of participants' and Leave button)
how can I attach this button to be always on the bottom of screen, no matter what size of screen I have?
I hope pictures help you to understand what I mean. I also add the code but it is formatted weird, so sorry about that.
Screenshoot from device with above problem:
How it looks on another device and how it should look:
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
appBar: AppBar(
title: const Text('Flutter SDK'),
centerTitle: true),
body: Padding(
padding: const EdgeInsets.all(16),
child: !isInitializedList
? Column(
children: [
TextField(
controller: usernameController,
readOnly: true),
const SizedBox(height: 12),
TextField(
decoration: const InputDecoration(hintText: 'Conference name'),
controller: conferenceNameController),
const SizedBox(height: 12),
ElevatedButton(
onPressed: () async {
// Step 5: Call joinConference()
await joinConference();
},
child: isJoining
? const Text('Joining...')
: const Text('Join the conference')),
const Divider(thickness: 2),
const Text("Join the conference to see the list of participants.")
],
)
: Column(
children: [
Text(
'Conference name: ${conferenceNameController.text}',
style: const TextStyle(fontWeight: FontWeight.w400, fontSize: 16)),
const SizedBox(height: 16),
Column(
children: [
const Align(
alignment: Alignment.centerLeft,
child: Text(
'List of participants:',
style: TextStyle(color: Colors.blue, fontWeight: FontWeight.w600))),
const SizedBox(height: 16),
// Step 7: Display the list of participants
ListView.separated(
separatorBuilder: (BuildContext context, int index) {
return const SizedBox(height: 5);
},
shrinkWrap: true,
itemCount: participants.length,
itemBuilder: (context, index) {
var participant = participants[index];
return Padding(
padding: const EdgeInsets.all(4),
child: Row(children: [
Expanded(
flex: 1,
child: SizedBox(
height: 150,
width: 150,
child: VideoView.withMediaStream(
participant: participant,
mediaStream: participant.streams?.firstWhereOrNull((s) =>
s.type == MediaStreamType.camera),
key: ValueKey('video_view_tile_${participant.id}'))),
),
Expanded(
flex: 1,
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 8.0),
child: Column(
mainAxisAlignment:
MainAxisAlignment.center,
children: [
Text(
"${participant.info?.name.toString()}"),
Text(
"status: ${participant.status?.name}")
]),
),
)
]),
);
}),
]),
const SizedBox(height: 16),
ElevatedButton(
style: ElevatedButton.styleFrom(primary: Colors.red),
onPressed: () async {
// Step 6: Call leaveConference()
await leaveConference();
},
child: isJoining
? const Text('Leaving...')
: const Text('Leave the conference'))
])
)
);
}
When you want to make list view expand as much as available, you need to wrap it with Expanded widget, by that you tell to column give it space as much as you have, also you need to do this for inside column agin, like this:
Column(
children: [
Text('Conference name: ${conferenceNameController.text}',
style: const TextStyle(fontWeight: FontWeight.w400, fontSize: 16)),
const SizedBox(height: 16),
Expanded(// <--- add this
child: Column(
children: [
const Align(
alignment: Alignment.centerLeft,
child: Text('List of participants:',
style: TextStyle(
color: Colors.blue,
fontWeight: FontWeight.w600))),
const SizedBox(height: 16),
Expanded( // <--- add this
child: ListView.separated(
separatorBuilder:
...
)
You can make listview scrollable with shrinkwrap parameter inside Listview.builder()
I have joined tables of data that I need to scroll together on both horizontal and vertical axis, with heading First Row that should not scroll with vertical data, but should scroll with horizontal.
You can see from my video that my simplified example below will scroll as desired vertically, but the rows, being independent do not scroll horizontally together as needed. The question is how to scroll each independent list horizontally together without losing the vertical functionality. The number of rows and columns is variable and can be quite large. My example code below is simplified to illustrate the behavior.
The below is a complete project example that can be cut and pasted into a dartpad flutter project or just click here: https://dartpad.dev/?id=6c4ea40ceee87ce9de4bcfe38ba0b750
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData.light(),
debugShowCheckedModeBanner: false,
home: Scaffold(
body: MyWidget(),
),
);
}
}
class MyWidget extends StatelessWidget {
#override
Widget build(BuildContext context) {
List listDates = ['Jan', 'Feb', 'Mar', 'Apr'];
Map<String, List> all = {
'Todd': [1,2,3,4],
'Mary': [5,6,7,8],
'Henry': [9,10,11,12],
};
List<String> names = [];
all.forEach((key,value) {
names.add(key);
});
return Column(
children: [
SizedBox(
height: 200,
child: Row(
crossAxisAlignment: CrossAxisAlignment.end,
children: [
const SizedBox(
height: 200,
width: 200,
),
Expanded(
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: listDates.length,
itemBuilder: (context, index) {
return Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(
width: 200,
child: Center(
child: Text(
listDates[index],
style: const TextStyle(
fontWeight: FontWeight.w600,
),
maxLines: 1,
textAlign: TextAlign.center,
),
),
),
],
);
},),
),
],
),
),
Expanded(
child: ListView.builder(
itemCount: 3,
itemBuilder: (context, index) {
return Container(
decoration: BoxDecoration(
color: index.isOdd ? Colors.blue.withOpacity(.2) : Colors.grey.withOpacity(.2),
),
child: SizedBox(
height: 200,
width: double.infinity,
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.max,
children: [
SizedBox(
width: 200,
height: 200,
child: Padding(
padding: const EdgeInsets.all(4.0),
child: Text(
names[index],
style: const TextStyle(
fontWeight: FontWeight.w500,
),
),
),
),
Expanded(
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: listDates.length,
itemBuilder: (context, index2) {
List ints = all[names[index]]!;
return SizedBox(
width: 200,
child: Center(
child: Text(
ints[index2].toString(),
style: const TextStyle(
fontWeight: FontWeight.w600,
),
maxLines: 1,
textAlign: TextAlign.center,
),
),
);
},
),
),
],
),
),
);
},
),),
],
);
}
}
it's possible to make listview in expand and fill the container without overflow the container, and shrink when listview is short of content without declare manual min or max height?
Code
Flexible(
fit: FlexFit.loose,
child: Container(
padding: EdgeInsets.symmetric(vertical: 20, horizontal: 10),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(kBoxRadius),
boxShadow: [kBoxShadow]),
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
DText(
"Aug 2021",
size: 12,
weight: FontWeight.bold,
),
SizedBox(height: 10),
Row(
children: dates,
),
SizedBox(height: 15),
Container(
height: 1,
color: Color(0xFFE7E7E7),
),
Container(
constraints:
BoxConstraints(minHeight: 0, maxHeight: 600),
child: ListView.separated(
shrinkWrap: true,
itemBuilder: (context, index) {
return DText("Asd");
},
separatorBuilder: (_, __) {
return SizedBox(height: 10);
},
itemCount: 20,
),
)
],
),
),
)
Expectation
when the content is big
because i set manually max height.
Yes, it is possible using shrinkWrap: true. The code will be something like below,
class App extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(),
body: Center(
child: Container(
color: Colors.red,
child: ListView(
shrinkWrap: true,
children: <Widget>[
ListTile(title: Text('Apple')),
ListTile(title: Text('Orange')),
ListTile(title: Text('Banana')),
],
),
),
),
),
);
}
}
I currently have a listview with an alphabet scroller on the side. I'm trying to add a searchbox to the top, but whenever I wrap something in a column, I get errors.
Using the current code, ListView inside Stack is throwing Vertical viewport was given unbounded height.
When I remove the column and Text('TestString'), my code works fine. I have tried adding an Expandable around the ListView.Builder but this also doesn't seem to solve it.
#override
Widget build(BuildContext context) {
height = MediaQuery.of(context).size.height;
return Scaffold(
appBar: AppBar(
title: Text(widget.title,
style: TextStyle(
fontSize: 20.0,
color: Colors.white,
fontWeight: FontWeight.bold)),
centerTitle: true,
),
body: Column(
children: [
Text('TestString'),
new LayoutBuilder(
builder: (context, constraints) {
return new Stack(children: [
//Causes the current issue
ListView.builder(
itemCount: exampleList.length,
controller: _controller,
itemExtent: _itemsizeheight,
itemBuilder: (context, position) {
return Padding(
padding: const EdgeInsets.only(right: 32.0),
child: Card(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Text(
exampleList[position],
style: TextStyle(fontSize: 20.0),
),
),
));
},
),
Positioned(
right: _marginRight,
top: _offsetContainer,
child: _getSpeechBubble()),
Align(
alignment: Alignment.centerRight,
child: GestureDetector(
onTapDown: (details) {
_onTapDown(details);
},
child: GestureDetector(
onVerticalDragUpdate: _onVerticalDragUpdate,
onVerticalDragStart: _onVerticalDragStart,
onVerticalDragEnd: (details) {
setState(() {
isPressed = false;
});
},
child: Container(
//height: 20.0 * 26,
color: Colors.transparent,
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: []..addAll(
new List.generate(_alphabet.length,
(index) => _getAlphabetItem(index)),
),
),
),
),
),
),
]);
},
),
],
),
);
}
_getSpeechBubble() {
return isPressed
? new SpeechBubble(
nipLocation: NipLocation.RIGHT,
child: Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
width: 30,
child: Center(
child: Text(
"${_text ?? "${_alphabet.first}"}",
style: TextStyle(
color: Colors.white,
fontSize: 18.0,
),
),
),
),
],
),
)
: SizedBox.shrink();
}
ValueGetter? callback(int value) {}
_getAlphabetItem(int index) {
return new Expanded(
child: new Container(
width: 40,
height: 20,
alignment: Alignment.center,
child: new Text(
_alphabet[index],
style: (index == posSelected)
? new TextStyle(fontSize: 16, fontWeight: FontWeight.w700)
: new TextStyle(fontSize: 12, fontWeight: FontWeight.w400),
),
),
);
}
You can wrap your LayoutBuilder() with Expanded() like this and it won't show an error.
return Container(
child: Column(
children: [
Text("Header"),
Expanded(
child: ListView.builder(
itemCount:50,
itemBuilder: (BuildContext context, int index) {
return Text("List Item $index");
},
),
),
Text("Footer"),
],
),
);
You can try the code here
I am developing a Flutter application and I want to dynamically adjust the height of the ListView.
I want the list to have a maximum height of 200. If the height is more than that, user will have to scroll to reach the bottom. If height is below 200, it will take only as much space as needed.
Preview of application: Screenshot. As you can see Restaurants nearby is pushed to the very bottom of the page. I want the ListView to only take height of 200 or less so that the content below isn't pushed to the bottom.
Here is my current code:
#override
Widget build(BuildContext context) {
return Container(
padding: EdgeInsets.all(10.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
'Restaurants nearby',
style: TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
Divider(),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
RaisedButton(
child: Text('Enter restaurant manually'),
onPressed: () {
print('Button pressed');
},
),
],
),
Flexible(
child: ListView.builder(
itemBuilder: (BuildContext context, int index) {
return ListTile(
leading: CircleAvatar(
backgroundColor: Colors.cyan,
),
title: Text('Test restaurant'),
subtitle: Text('80m'),
);
},
itemCount: 15,
),
),
Text(
'Restaurants nearby',
style: TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
],
),
);
}
You are using Flexible widget, that's why your ListView expands. You have to change Flexible to ConstrainedBox and add shrinkWrap: true to your ListView.
ConstrainedBox(
constraints: BoxConstraints(maxHeight: 200, minHeight: 56.0),
child: ListView.builder(
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return ListTile(
leading: CircleAvatar(
backgroundColor: Colors.cyan,
),
title: Text('Test restaurant'),
subtitle: Text('80m'),
);
},
itemCount: 15,
),
),
More info here: https://api.flutter.dev/flutter/widgets/ConstrainedBox-class.html
You can use LimitedBox
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(...),
Divider(),
Row(...),
LimitedBox(
maxHeight: 200.0,
child: ListView.builder(...),
),
Text(...),
],
),
Recommended solution in case when the incoming constraints are unbounded
Consider wrapping the ListView into this
LimitedBox(
maxHeight: 200,
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Flexible(
child: ListView.builder(
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return ListTile(
leading: CircleAvatar(
backgroundColor: Colors.cyan,
),
title: Text('Test restaurant'),
subtitle: Text('80m'),
);
},
itemCount: _itemsCount,
),
),
]
)
),
Note that:
shrinkWrap of ListView is set to true
mainAxisSize of Column is set to MainAxisSize.min
maxHeight of LimitedBox is set to 200
A complete snippet:
import 'package:flutter/material.dart';
class DebugWidget extends StatefulWidget {
#override
_DebugWidgetState createState() => _DebugWidgetState();
}
class _DebugWidgetState extends State<DebugWidget> {
int _itemsCount = 1;
#override
Widget build(BuildContext context) {
Widget child = Container(
padding: EdgeInsets.all(10.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
'Restaurants nearby',
style: TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
Divider(),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
RaisedButton(
child: Text('Enter restaurant manually'),
onPressed: () {
print('Button pressed');
},
),
RaisedButton(
child: Text('+1'),
onPressed: () {
setState(() {
_itemsCount += 1;
});
},
),
RaisedButton(
child: Text('-1'),
onPressed: () {
setState(() {
_itemsCount -= 1;
});
},
),
],
),
LimitedBox(
maxHeight: 200,
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Flexible(
child: ListView.builder(
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return ListTile(
leading: CircleAvatar(
backgroundColor: Colors.cyan,
),
title: Text('Test restaurant'),
subtitle: Text('80m'),
);
},
itemCount: _itemsCount,
),
),
]
)
),
Text(
'Restaurants nearby',
style: TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
],
),
);
return Scaffold(
body: child,
);
}
}
I found a solution to this problem. you should wrap your ListView with LimittedBox or ConstraintBox and give them maxHeight and set shrinkWrap property of ListView to true. the solution would be something like this.
LimitedBox(
maxHeight: 200,
child: ListView.builder(
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return ListTile(
leading: CircleAvatar(
backgroundColor: Colors.cyan,
),
title: Text('Test restaurant'),
subtitle: Text('80m'),
);
},
itemCount: 15,
),
),
I see that this question has never been answered only with giving a fixed height, so here is what works for me.
For some reason if you set the shrinkwrap to true it doesn't look like it is working but it does, the problem is in the padding settings of the ListView, set the padding to edgeinstets.zero. That fixes it for me.
Wrap inside a Flexible
ShrinkWrap true
Padding, zero
and if needed the column to MainAxisSize.min.
Hope it helps some people.
Example of my code:
Flexible(
child: Container(
decoration: BStyles.cardDecoration1,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
const Text(
'PRODUCTION TASKS',
),
const SizedBox(
height: textVerticalSpacing,
),
Flexible(
child: ListView.builder(
itemCount: recentTasks.length,
padding: EdgeInsets.zero,
physics: const NeverScrollableScrollPhysics(),
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return TaskCard(
task: recentTasks[index],
widthInfo: MediaQuery.of(context).size.width * 0.6,
);
},
),
),
const SizedBox(
height: itemSpacing,
),
Align(
alignment: Alignment.centerRight,
child: InkWell(
onTap: () { },
child: const Text(
'View more',
),
),
),
const SizedBox(
height: textVerticalSpacing,
),
],
),
),
),
),
ConstrainedBox(
constraints: BoxConstraints(maxHeight: 200.0),
child: [your child here],
)
This make your child's height not bigger than 200.0
You can always size the ListView container as % of the viewport (assuming of course that the other widgets also are sized in the same manner):
return Container(
height: MediaQuery.of(context).size.height * 0.75,
child: ListView.builder(
itemBuilder: (ctx, index) {
return Card(...