I am trying to learn how to create complex UI elements in flutter and faced this problem. Suppose I want to put a pageview in my listView and display the same items as in the horizontal scrolling list. Is there any way to do this?
Here is my code of build method with listview:
#override
Widget build(BuildContext context) {
return ListView.builder(
itemCount: _catList.length,
itemBuilder: (context, index) {
return Card(
child: Column(
children: [
Card(
child: ListTile(
title: Text(_catList[index].name),
),
),
IntrinsicWidth(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Expanded(
child: Column (
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text ('ID: ${_catList[index].id}'),
Text ('Country code: ${_catList[index].countryCodes}'),
Text ('Temperament: ${_catList[index].temperament}'),
Text ('Origin: ${_catList[index].origin}')
],
)
),
Expanded(
child: Card(
child: Text(_catList[index].description),
),
)
],
),
),
Container (
child: PageView.builder (itemBuilder: (context, index) {
} ),
)
],
),
);
},
);
}
As i under stand you want to add PageView in side ListView. So your ListView scroll in vertical direction and your PageView scroll in horizontal direction. If i am not wrong then below is my code to do the same things.
I have made my List which contain multiple List like below.
var modelListOne = ["model_1_1.png", "model_1_2.png",];
var modelListTwo = ["model_2_1.png", "model_2_2.png",];
var modelList = [modelListOne, modelListTwo,];
return ListView.builder(
itemCount: modelList.length,
itemBuilder: (context, index) {
return InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => YOURPAGE());
},
child: Card(
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Container(
height: 350,
width: double.maxFinite,
child: PageView.builder(
itemCount: modelList[index].length,
scrollDirection: Axis.horizontal,
itemBuilder: (context, pageIndex) {
return Container(
height: 300,
width: double.maxFinite,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage(
"assets/images/${modelList[index][pageIndex]}",
),
fit: BoxFit.cover)),
);
}),
)),
),
);
});
Make changes regarding to your requirements. Thanks.
Related
I am trying to create a horizontally scrollable list of cards but it breaks each. I am just not sure where I am going wrong. I tried adding Expandable in several places and I still get errors.
I am hoping this is resolvable or do I need to separate each element within the Container/Column (2nd one).
It is definitely some sort of sizing I am missing but just not able to pinpoint where.
body: SafeArea(
child: Column(
children: [
Container(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(...),
Padding(...),
Padding(...),
SizedBox(...),
Padding(...),
SizedBox(...),
Padding(...),
SizedBox(...),
Container(
height: 200,
color: Colors.blue[200],
child: ListView(
shrinkWrap: true,
physics: ScrollPhysics(),
scrollDirection: Axis.vertical,
children: [
FutureBuilder(
future: getAudioList(),
builder: (context, data) {
if (data.hasError) {
return Center(child: Text("${data.error}"));
} else if (data.hasData) {
var items = data.data as List<MyOtherFunc>;
var categories;
//Split into categories
if (items != null) {
categories = groupBy(
items, (MyOtherFunc ma) => ma.category);
Map<String, List<MindfulAudio>> catMap =
categories;
return new ListView.builder(
padding:
const EdgeInsets.fromLTRB(8, 0, 8, 0),
itemCount: catMap.length,
physics:
const AlwaysScrollableScrollPhysics(),
shrinkWrap: true,
itemBuilder: (context, index) {
String key = catMap.keys.elementAt(index);
return Card(
child: ListTile(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
MyFunc(
catMap[key], key),
),
);
},
leading: Icon(icons[index],
size: 25, color: colour[index]),
title: new Text("$key"),
trailing: new IconButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
MyFunc(
catMap[key], key),
),
);
},
icon: Icon(
FontAwesomeIcons.chevronRight,
color: PINK,
)),
),
);
},
);
}
return Center(
child: CircularProgressIndicator(),
);
} else {
return Center(
child: CircularProgressIndicator(),
);
}
},
),
],
),
),
],
),
),
],
),
),
Try this layout
SizedBox(
height: MediaQuery.of(context).size.height,
width : MediaQuery.of(context).size.width,
child: SingleChildScrollView (
child: Column(
children: [
//Other widgets which will scroll vertically in the column
SingleChildScrollView (
scrollDirection: Axis.horizontal,
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
//Items you wish to scroll horizontally
]
)
),
//Some more widgets if you wish to add below the horizontal scroll
]
)
)
)
Newbie here. I have managed to implement a ListView that simply displays images. However the ListView isn't scrollable. I have attempted to wrap it in SingleChildScrollView, have added physics to AlwaysScrollableScrollPhysics and also tried removing Expand widgets from the layout. What am I missing?
LAYOUT
return Scaffold(
body: SingleChildScrollView(
child: Column(children: [
SizedBox(
height: 6,
),
StreamBuilder(
stream: ref.onValue,
builder: (context, AsyncSnapshot snapshot) {
if (snapshot.hasData &&
!snapshot.hasError &&
snapshot.data.snapshot.value != null) {
lists.clear();
DataSnapshot dataValues = snapshot.data.snapshot;
Map<dynamic, dynamic> values = dataValues.value as Map;
values.forEach((key, values) {
lists.add(values);
});
return new ListView.builder(
physics: AlwaysScrollableScrollPhysics(),
shrinkWrap: true,
itemCount: lists.length,
itemBuilder: (BuildContext context, int index) {
return Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.start,
children: [
Card(
margin: EdgeInsets.fromLTRB(2, 2, 2, 2),
elevation: 20,
child: GestureDetector(
onTap: () {
String imageurl = lists[index]["image"];
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => FullScreenImageViewer(
imagurl: imageurl,
),
));
},
child: Padding(
padding: EdgeInsets.all(5),
child: Container(
width: 400,
child: Image(
image:
NetworkImage(lists[index]["image"]),
),
),
),
),
),
],
);
},
);
}
return Container();
},
),
]),
),
);
You can remove the single child scroll view, i believ the problem here is because you are using a column and the listview is not expanding to the whole screen. If you want to make sure the listview occupy the all the space remaining you can use the Flex and expanded widget.
Flex can work like a column or row depending on which direction you are providing it with. anything that is placed here behave exactly like when they is placed in the column or row except for Expanded, as they fill the remainning space.
I've changed your code a bit here to accomodate the Flex and Expanded widget (you just need to readd your logic and the streambuilder to make it work)
return Scaffold(
body: Flex(direction: Axis.vertical, children: [
const SizedBox(
height: 6,
),
Expanded(
// Change the children to stream builder if neccesary
child: ListView.builder(
shrinkWrap: true,
itemCount: 5,
itemBuilder: (BuildContext context, int index) {
return Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.start,
children: [
Card(
margin: const EdgeInsets.all(2),
elevation: 20,
child: GestureDetector(
onTap: () {
// ACTION HERE
},
child: const Padding(
padding: EdgeInsets.all(5),
child: Image(
image: NetworkImage("https://picsum.photos/200/300"),
),
),
),
),
],
);
},
),
)
]),
);
There's a property within listView() that tells it which irection the overflow is so as to scroll. Set it to
scrollDirection: Axis.horizontal
I am trying to add a GestureDetector on my ListView widget which contains Images but it does not seem to work. A similar question has been asked about it before but that did not help either.
Here is my code:
ListView.builder(
scrollDirection: Axis.horizontal,
itemBuilder: (BuildContext ctx, int index) {
return Container(
width: 160,
child: Card(
child: Wrap(
children: <Widget>[
GestureDetector( onTap: () => Print_on_layout(index),
child: Image.network(a[index], fit: BoxFit.fill,)
)
],
),
),
);
},
itemCount: a.length,
),
I suppose this has something to do with the wrap Widget, which might be messing with the space where the tap can be detected. Try removing it. If that doesn't work, please tell us if you get an error.
Use gesturedetector as a parent of the container not on image.
as in the list you are only returning a single widgit so you should container with gesture detector.
Try this code:
ListView.builder(
scrollDirection: Axis.horizontal,
itemBuilder: (BuildContext ctx, int index) {
return
GestureDetector(onTap: () => Print_on_layout(index),
child: Container(
width: 160,
child: Card(
child: Wrap(
children: <Widget>[
Image.network(a[index], fit: BoxFit.fill,)
],
),
),
),
);
},
itemCount: a.length,
),
I'd like to add carousel above in listview.builder but the scrolling only happens below in carousel, and the carousel is fixed
// scroll carousel here
new Expanded(
child: new ListView.builder(
itemCount: 4,
itemBuilder: (BuildContext context, int index) {
return itemFeed(context: context, index: index);
}
)
)
You can use a Column to achieve this. Remember to wrap the ListView.builder with a Expanded widget inside the Column.
Example -
Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Container(
height: 100.0,
width: double.infinity,
child: Text('Fixed Box'),
color: Colors.pink,
),
Expanded(
child: ListView.builder(
itemBuilder: (context, index) => Text("Index - " + index.toString()),
itemCount: 100,
),
)
],
)
In my Flutter project, I have a container with a fixed height. Inside that container I have a Listview.
Here's the code-
return new Scaffold(
appBar: AppBar(
title: Text("All Values"),
),
body: new Column(
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
Container(
height: isLoading ? 50.0 : 0,
color: Colors.white70,
child: Center(
child: new CircularProgressIndicator(),
),
),
Expanded(
child: Container(
height: 350,
color: Colors.red,
alignment: Alignment.bottomLeft,
child:
new ListView.builder(
itemCount: data.length-8,
itemBuilder: (BuildContext cxtx, int index) {
return Padding(
padding: const EdgeInsets.fromLTRB(10, 0.0, 10, 0),
child: Container(
child: showCard(index, radius),
),
);
},
controller: _scrollController,
),
),),
],
),
resizeToAvoidBottomPadding: false,
);
The code outputs like below-
So, the problem is I want to align these items at bottom left of the container. I could have done that using reverse: true but I need the list items with the same sequence. So, I need suggestion how can I do that?
You need those items in a row or a column? Follow with a row possibility:
Try this:
return new Scaffold(
appBar: AppBar(
title: Text("All Values"),
),
body: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
if(isLoading)
Container(
height: 50.0 ,
color: Colors.white70,
child: Center(
child: new CircularProgressIndicator(),
),
),
Expanded(
child: Container(
height: 350,
color: Colors.red,
alignment: Alignment.bottomLeft,
child: new ListView.builder(
itemCount: data.length - 8,
itemBuilder: (BuildContext cxtx, int index) {
return Padding(
padding: const EdgeInsets.fromLTRB(10, 0.0, 10, 0),
child: Container(
child: Text('asdf'),
),
);
},
controller: _scrollController,
),
),
),
],
),
resizeToAvoidBottomPadding: false,
);
StoreConnector<_ViewModel, List<Message>>(
converter: (store) {
// check mark ,reverse data list
if (isReverse) return store.state.dialogList;
return store.state.dialogList.reversed.toList();
},
builder: (context, dialogs) {
// Add a callback when UI render after. then change it direction;
WidgetsBinding.instance.addPostFrameCallback((t) {
// check it's items could be scroll
bool newMark = _listViewController.position.maxScrollExtent > 0;
if (isReverse != newMark) { // need
isReverse = newMark; // rebuild listview
setState(() {});
}
});
return ListView.builder(
reverse: isReverse, // 反转列表,insert数据时,刷新到0,加载更多时,滚动偏移不变
controller: _listViewController,
itemBuilder: (context, index) => _bubbleItem(context, dialogs[index], index),
itemCount: dialogs.length,
);
},
)