I am trying to change my ListView to be Shown horizontally instead of veritcally by default. However, when I have done this, I face the following an error. The error occurs at both the Widgets returned by the _buildListItem function and disappears when the scrolldirection is changed from vertical back to horizontal.
RenderBox was not laid out: RenderPointerListener#98473 relayoutBoundary=up5 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
The code of the ListView Builder is
Widget _buildListItem (BuildContext context,DocumentSnapshot doc,int index)
{
if(index ==0)
{
return ListTile(title:Container( height:200,width: 100,child: Card(shape: new RoundedRectangleBorder(),child:Column(children:<Widget>[new Flexible(child:Text(widget.prayerName,style: TextStyle(fontSize: 32,fontWeight: FontWeight.bold))),Text(widget.blurb,style: TextStyle(fontSize: 28))]))));
}
else {
return RaisedButton(child: Text("a"),);
}
}
Here is the body of my build widget where my list view is declared
body: StreamBuilder(
stream: Firestore.instance.collection('quranKhwani').document(widget.docID).collection("juz").orderBy("juzNumber").snapshots(),
builder: (context,snapshot)
{
if(!snapshot.hasData)return const Text("Loading..");
return ListView.builder(
shrinkWrap: true,
scrollDirection: Axis.horizontal,
itemBuilder: (context,index)=>
_buildListItem(context,snapshot.data.documents[index],index),
itemCount: snapshot.data.documents.length,
);
}
)
));
Container(
height: _height //add height
child: StreamBuilder(
builder: (context, snapshot) {
return ListView.builder(
itemBuilder: (context, index) {},
scrollDirection: Axis.horizontal,
);
},
),
)
You have to give height to the StreamBuilder like:
body: Container(
height: 300, // Height you want
child:
StreamBuilder(
stream: Firestore.instance.collection('quranKhwani').document(widget.docID).collection("juz").orderBy("juzNumber").snapshots(),
builder: (context,snapshot)
{
if(!snapshot.hasData)return const Text("Loading..");
return ListView.builder(
shrinkWrap: true,
scrollDirection: Axis.horizontal,
itemBuilder: (context,index)=>
_buildListItem(context,snapshot.data.documents[index],index),
itemCount: snapshot.data.documents.length,
);
}
),
),
),
Related
I have this code:
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => addProductClass()),
);
},
child: const Icon(
Icons.add,
color: Colors.black,
),
),
body: Column(children: [
FutureBuilder(
future: getDocId(),
builder: (context, snapshot) {
return ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: dataIDs.length,
itemBuilder: (BuildContext context, int index) {
return GetProduct(
documentId: dataIDs[index],
);
},
);
}),
Text("text")
]));
}
And i want to use scrollDirection: Axis.horizontal for listview. When I insert this value, I got the error:
Horizontal viewport was given unbounded height
Viewports expand in the cross axis to fill their container and '
'constrain their children to match their extent in the cross axis. '
'In this case, a horizontal viewport was given an unlimited amount of '
'vertical space in which to expand
How can I resolve this?
Easiest way is to provide a fixed height, either using a SizedBox or a ConstrainedBox with a maxHeight set.
Try to set shrinkwrap to true for listview builder
here is an example of listview builder in horizontal mode :
SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: ListView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
scrollDirection: Axis.horizontal,
itemCount: 10,
itemBuilder: (BuildContext context, int index){
return Container( margin: EdgeInsets.all(5), height:10, width:20, color:black);
}
),
),
hope it will help !
Flutter newbie here!
Currently, my Scaffold has 2 listview builders and the bottom one is giving me the unbounded height (!constraints.hasBoundedHeight error) issue.
I have tried using shrinkWrap on all 3 list views, as suggested in similar questions but I get the same error.
The only thing that works is wrapping the FutureBuilder in a SizedBox. But that seems unintuitive to me, as I would want it to ideally expand as needed and be scrollable.
My rough solution is to maybe dynamically calculate the height based on the number of items the FutureBuilder needs, but again, I feel there should be a better solution.
My code snippet is attached below:
return Scaffold(
appBar: AppBar(),
body: ListView(
children: [
ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: 2,
itemBuilder: (context, index) {
return const SuggestCard(
indexKey: 'takt',
);
}),
FutureBuilder<AnimeDetails>(
future: _animeDetail,
builder: (context, snapshot) {
if (snapshot.hasData) {
return ListView.builder(
itemCount: 2, //Number of anime from list
itemBuilder: (context, index) {
var anime = snapshot.data; //Get the data from the index
return AnimeCard(
anime: anime,
);
});
} else {
return const Center(child: CircularProgressIndicator());
}
},
),
],
),
);
As per your comment I think below link will helpful to you.
Lists
The parent ListView handling scroll event for body and while second ListView will have fixed height, you can do it like this
return Scaffold(
body: LayoutBuilder(
builder: (context, constraints) => ListView(
children: [
SizedBox(
height: constraints.maxHeight * .3,
child: ListView.builder(
itemCount: 122,
shrinkWrap: true,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) => Text("H $index"),
),
),
ListView.builder(
shrinkWrap: true,
physics:
const NeverScrollableScrollPhysics(), // parent controll the scroll event
itemCount: 44,
itemBuilder: (context, index) => Text("$index"),
),
],
),
));
I just added the below lines to your code. You can try the below code.
shrinkWrap: true,
physics: const NeverScrollableScrollPhysics(),
return Scaffold(
appBar: AppBar(),
body: ListView(
children: [
ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: 2,
shrinkWrap: true,
physics: const NeverScrollableScrollPhysics(),
itemBuilder: (context, index) {
return const SuggestCard(
indexKey: 'takt',
);
}),
FutureBuilder<AnimeDetails>(
future: _animeDetail,
builder: (context, snapshot) {
if (snapshot.hasData) {
return ListView.builder(
itemCount: 2, //Number of anime from list
shrinkWrap: true,
physics: const NeverScrollableScrollPhysics(),
itemBuilder: (context, index) {
var anime = snapshot.data; //Get the data from the index
return AnimeCard(
anime: anime,
);
});
} else {
return const Center(child: CircularProgressIndicator());
}
},
),
],
),
);
Problem: I am beginner for flutter developing. I tried to get data from firestore and display it. But scrolling listview didn't respond to one finger so I had to use more than one. How to solve this problem.
body: StreamBuilder(
stream: _firebase_auth.collection("ContactData").snapshots(),
builder: (BuildContext context, snapshot) {
if (snapshot.hasData) {
return ListView.builder(
itemCount: snapshot.data.docs.length,
itemExtent: 100.0,
itemBuilder: (context, index) {
DocumentSnapshot data = snapshot.data.docs[index];
return Card(
child: ListView(padding: EdgeInsets.all(8.0), children: [
Text('sds'),
Text('sds'),
Text('sds'),
Text('sds'),
Text('sds'),
]),
);
});
} else {
return Text('Loading Data.....');
}
},
),
you should wrap streamBuilder with the SingleChild scroll view or use shrinkWrap: true,physics: ScrollPhysics(),
body: StreamBuilder(
stream: _firebase_auth.collection("ContactData").snapshots(),
builder: (BuildContext context, snapshot) {
if (snapshot.hasData) {
return ListView.builder(
shrinkWrap: true,
physics: ScrollPhysics(),
itemCount: snapshot.data.docs.length,
itemExtent: 100.0,
itemBuilder: (context, index) {
DocumentSnapshot data = snapshot.data.docs[index];
return Card(
child: ListView(padding: EdgeInsets.all(8.0), children: [
Text('sds'),
Text('sds'),
Text('sds'),
Text('sds'),
Text('sds'),
]),
);
});
} else {
return Text('Loading Data.....');
}
},
),
add this line in listView.builder
physics: AlwaysScrollableScrollPhysics(),
Wrap stream builder with SingleChildScrolView.
This will make the screen a scrollable element.
Set physics of ListView.builder to NeverScrollablePhysics.
This will prevent the scrolling of the parent ListView.Builder, but it's okay because it's parent, SingleChildScrollView is
scrollable.
Set physics of ListView to Scrollable
If you want to, not sure if you want to scroll these items or just display.
I'm trying to make my listview always focus on the last element in a chat, but I don't know how to do it, I appreciate if someone can help me
Widget ChatMessageList(){
return StreamBuilder(
stream: chatMessageStream,
builder: (context, snapshot){
return snapshot.hasData ? ListView.builder(
controller: _scrollController,
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index){
return MessageTile(snapshot.data.documents[index].data()['message'],
snapshot.data.documents[index].data()['sendBy'] == userSnapshop.uid);
}
) : Container();
},
);
}
List view can be reverse by wrapping another scrollable widget.
so you just need to wrap your ListView by SingleChildScrollView and change the reading direction by revers property.
SingleChildScrollView(
reverse: true,
child: ListView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
itemCount: 100,
itemBuilder: (context, index) => Text(
index.toString(),
),
),
)
_animateToLast() {
debugPrint('scroll down');
_scrollController.animateTo(
_scrollController.position.maxScrollExtent,
curve: Curves.easeOut,
duration: const Duration(milliseconds: 500),
);
}
I am trying to add 70.0px at the bottom of each of my Container item in my ListView.
I have been looking at a lot of answers from StackOverflow and trying them in many different ways, and adding padding inside ListView doesn't work somehow. However, I still couldn't tackle it.
Can someone please give me some advice please?
class PortfolioRow extends StatelessWidget {
#override
Widget build(BuildContext context) {
return LayoutBuilder(builder: (context, constraints) {
return Container(
margin: const EdgeInsets.only(bottom: 70.0),
child: StreamBuilder(
stream: Firestore.instance
.collection('portfolio')
.where('category')
.snapshots(),
builder: (context, snapshot) {
return ListView.builder(
physics: ScrollPhysics(),
shrinkWrap: true,
itemExtent: 450.0,
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) => portfolioContainer(
context, snapshot.data.documents[index]));
}));
...
}
Widget portfolioContainer(
BuildContext context, DocumentSnapshot documentSnapshot) {
return Align(
child: SizedBox(
height: 540,
width: 330,
child: Container( // if I add padding bottom here, there will be a pixel overflow in my container
child: Column(children: [
Container(
...
}
ListView has a named constructor for exactly that : ListView.separated(). The separatorBuilder parameter lets you specify a widget that will be added at the bottom of each item :
ListView.separated(
itemCount: 25,
separatorBuilder: (BuildContext context, int index) => Divider(),
itemBuilder: (BuildContext context, int index) {
return ListTile(
title: Text('item $index'),
);
},
)