I have several containiers inside a ListView which will result in a scrollable content within a page. Each container has a Column as child and within the Column I have a title and a divider, then the actual content.
I want one of the container to be something like:
Title
--------- (divider)
Scrollable content (most likely a ListView)
What I have so far:
Container(
height: 250,
child: Column(children: <Widget>[
Text('Title'),
Divider(),
SingleChildScrollView(
child: ListView.builder(
shrinkWrap: true,
itemCount: 15,
itemBuilder: (BuildContext context, int index) {
return Text('abc');
}
)
)
]
)
The thing is that I want the container to have a specific height, but I get an overflow pixel error.
Wrap your ListView with Expanded. Remove your SingleChildScrollView as ListView has its own scrolling behaviour. Try as follows:
Container(
height: 250,
child: Column(children: <Widget>[
Text('Title'),
Divider(),
Expanded(
child: ListView.builder(
shrinkWrap: true,
itemCount: 15,
itemBuilder: (BuildContext context, int index) {
return Text('abc');
}
),
)
]
))
Wrap your ListView.builder() widget inside a SizedBox() widget and specify available height after accommodating Title() widget.
Container(
height: 250,
child: Column(children: <Widget>[
Text('Title'),
Divider(),
SizedBox(
height: 200, // (250 - 50) where 50 units for other widgets
child: SingleChildScrollView(
child: ListView.builder(
shrinkWrap: true,
itemCount: 15,
itemBuilder: (BuildContext context, int index) {
return Text('abc');
}
)
)
)
]
)
You can also use Container() widget instead SizedBox() widget but only if needed.
SizedBox() is a const constructor where Container() widget is not, so SizedBox() allows the compiler to create more efficient code.
Related
I have a vertical ListView inside a Card inside a Row, next to another widget, which can have different heights. Now I would like the Card to stretch to fill all the space of the Row. Here is an example:
#override
Widget build(BuildContext context) {
return Row(
children: [
Card(
child: WidgetWithDynamicHeight(),
),
Card(
child: ListView.builder(
itemCount: items.length,
itemBuilder: (context, index) => MyListTile(items[index]),
),
),
]
);
}
Now, I could wrap everything with a SizedBox and set a fixed height, but that is not what I want. I want the Row to be as big as the first Widget (WidgetWithDynamicHeight), and the second card to have the exact same size. How can I implement that?
Try Intrinsic height. It will build all children at the same height of the tallest child
return IntrinsicHeight(
child: Row(
children: [
Card(
child: WidgetWithDynamicHeight(),
),
Card(
child: ListView.builder(
itemCount: items.length,
itemBuilder: (context, index) => MyListTile(items[index]),
),
),
]
)
);
More about IntrinsicHeight
I am facing this
Exception :
FlutterError (RenderViewport does not support returning intrinsic
dimensions. Calculating the intrinsic dimensions would require
instantiating every child of the viewport, which defeats the point of
viewports being lazy. If you are merely trying to shrink-wrap the
viewport in the main axis direction, consider a
RenderShrinkWrappingViewport render object (ShrinkWrappingViewport
widget), which achieves that effect without implementing the intrinsic
dimension API.)
When i add ProductsWidget the Exception occurs.
the code of Products Widget is:
class ProductsWidget extends GetResponsiveView<HomeTabController> {
#override
Widget build(BuildContext context) {
return ListView.builder(
shrinkWrap: true,
itemCount: 3,
// padding: EdgeInsets.symmetric(vertical: 20),
physics: NeverScrollableScrollPhysics(),
itemBuilder: (context, index) => Column(
children: [
Row()])}}
the calling code is:
body: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
return SingleChildScrollView(
child: ConstrainedBox(
constraints: BoxConstraints(
minHeight: constraints.maxHeight,
),
child: IntrinsicHeight(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Expanded(
// flex: 1,
child: HomeAppBar()),
// listView
// i made shrinkWrap=true
// neverScroll
Flexible(fit: FlexFit.tight, child: ProductsWidget()),
],
),
),
),
);
}),
Try wrapping your ProductsWidget in a SizedBox and give it a width (width: double.maxFinite,) and potentially height.
I had a similar issue and I found the following post helpful: flutter listview with radio not showing in alertDialog
That is because ListView builds each child lazily. You can use a Column wrapped in a SingleChildScrollView instead of the ListView.
Replace SingleChildScrollView with CustomScrollView like this:
return Scaffold(
appBar: AppBar(
title: Text('Expanded Scrollable'),
),
body: CustomScrollView(
physics: AlwaysScrollableScrollPhysics(),
slivers: [
SliverFillRemaining(
fillOverscroll: true,
child: Column(
children: <Widget>[
Text('Hello ... '),
Divider(
height: 2,
),
Expanded(
child: Container(color: Colors.red,), // replace this Container with your listview
)
],
),
)
],
),
);
I am trying to build a Nested listview but getting "RenderFlex children have non-zero flex but incoming height constraints are unbounded" error with below code.
Layers are like this...
Each item of a horizontal ListView has a Text widget and a ListView widget.
At the second level, each item of vertical ListView contains again a Text widget and a ListView.
At the third level, each item of the ListView contains a Text widget.
-Horizontal ListView
- Person's Name
- ListView
- Relation Name
- ListView
- Person's Name
Thanks in advance.
person.relations is a Map<String, List<Person>>
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Relationship Explorer"),
),
body: SafeArea(
child: BlocBuilder<RelationCubit, CubitState>(
bloc: _cubit,
builder: (_, state) {
if (state is RelationSuccessState) {
return ListView.builder(
scrollDirection: Axis.horizontal,
itemBuilder: (_, outerIndex) =>
_relationTreeView(context, outerIndex),
itemCount: _cubit.people.length,
);
} else {
return WaitWidget();
}
},
),
),
);
}
Widget _relationTreeView(BuildContext context, int outerIndex) {
var person = _cubit.people[outerIndex];
return Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(person.displayName ?? ''),
Expanded(
child: Container(
width: MediaQuery.of(context).size.width,
child: ListView.builder(
shrinkWrap: true,
physics: ClampingScrollPhysics(),
itemCount: person.relations?.length,
itemBuilder: (_, index) {
var persons = person.relations?[index];
return Column(
mainAxisSize: MainAxisSize.min,
children: [
Text(person.relations!.keys.elementAt(index)),
Expanded(
child: Container(
width: MediaQuery.of(context).size.width,
child: ListView.builder(
shrinkWrap: true,
physics: ClampingScrollPhysics(),
itemCount: persons.length,
itemBuilder: (_, index) {
var innerPerson = persons[index];
return Text(innerPerson.displayName ?? '');
},
),
),
)
],
);
},
),
),
),
],
);
}
Wrap the list view with a container and give a height.
I am using an API to build a movies application, I had a problem with making theListView to be from left to right instead of up and dowm.I am trying to create a horizontal list view but it displayed not as expected. You can see how it looks in the Image bellow. It works with me usually but it my first time to do that inside a listview builder. How to fix that?
Note: I want the full screen to be vertical and this part only horizontal.
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
child:
FutureBuilder(
future: getData(),
builder: (BuildContext context,AsyncSnapshot snapshot){
if(snapshot.data == null){
return Container(
child: Center(
child:CircularProgressIndicator() ,),);
}
else{
return ListView.builder(
itemCount: snapshot.data.length,
itemBuilder: (BuildContext context,int i){
if(snapshot.data==null){
return Center(
child: CircularProgressIndicator(),
);
}
else{
return Container(
height: 250,
child: Card(
child: ListView(
scrollDirection: Axis.horizontal,
children: [
Image(image: NetworkImage(snapshot.data[i].poster))
],
),
),
);
}}
);
}
}
,),
),
);
}
}
Image
You can use scrollDirection: Axis.horizontal,
inside the Listview.Builder to make it scroll horizontally and add a width for the container that's being returned.
Try below code hope its helpful to you . declare your ListView.builder() like below refer Listview here
Container(
width: double.infinity,
height: 180,
child: ListView.builder(
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemCount: 10,
itemBuilder: (BuildContext context, int i) {
return Container(
height: 50,
child: Card(
child: Image.network(
'https://tech.pelmorex.com/wp-content/uploads/2020/10/flutter.png',
),
),
);
},
),
),
Your result screen->
I want to create listview like this image. How can I achieve this using flutter?
Please do a favour if you know how to make it?
You need a List view widget and with builder which contains a card widget which has Row as child.
ListView :-
ListView.builder(
padding: EdgeInsets.all(10.0),
shrinkWrap: false,
itemCount: model.length,
itemBuilder: (BuildContext context, int index) {
return listItem(context, index);
},
List item :-
model is removed
Widget listItem(BuildContext context, int index) {
return Card(
child: Row(
children: <Widget>[
Container(margin: EdgeInsets.all(10),child: Text("1")),
Container(height: 20,width: 1,color: Colors.blue,),
Container(margin:EdgeInsets.all(10),child: Text("asdasd"))
],
),
);
}