I have as screen that is centered using:
SafeArea(
child: Column(
children: <Widget>[
Expanded(
child: Center(
child: ...,
),
),
],
),
)
But if the content is larger than the screen size, it will overflow. How can I keep the content centered, but at the same time start scrolling if it overflows?
You could use ListView widget and then put your content into it's children
Like so:
SafeArea(
child: ListView(
children: <Widget>[
Expanded(
children: <Widget>[
Center(
child: ...,
),
]
),
],
),
)
Replace your column with a ListView.
Following #Tembero's logic, I added a shrinkWraped ListView, removed the Expanded, and wrapped the ListView in a Center widget, so now it behaves exactly as expected:
SafeArea(
child: Center(
child: ListView(
shrinkWrap: true,
children: <Widget>[
Center(
child: ...
),
],
),
),
)
Related
The widgets inside the child scroll view doesn't scroll and throws bottom overflow exception on the screen when there are more widgets in that list view. I am not sure where I am doing a mistake.
home: Scaffold(
body: Column(
children: [
APPbar(),
Container(
color: Colors.grey[200],
child: Expanded(
child: Column(
children: [
searchBar(),
Row(children: casewidgets),
],
)
),
)
SingleChildScrollView(
child:Column(
children: [
Text("a new column"),
Text("a new column"),
Text("a new column"),
Text("a new column"),
],
)
),
]
)),
You can use Expanded on SingleChildScollView to get aviable height, and remove column's Expanded.
home: Scaffold(
body: Column(children: [
// APPbar(),
Container(
color: Colors.grey[200],
child: Column(
children: [
// searchBar(),
Row(children: []),
],
),
),
Expanded(
child: SingleChildScrollView(
child: Column(
children: [
for (int i = 0; i < 33; i++) Text("a new column"),
],
)),
),
])),
You cannot use expand when using a singlechildscrollview in appropriate way. First you need to understand that expand covers the maximum height and width on the screen or the specific section in which you use expand.
Instead of using SingleChildScrollView, It's easier to use CustomScrollView with a SliverFillRemaining. and it's works work's great.
CustomScrollView(
slivers: [
SliverFillRemaining(
hasScrollBody: false,
child: Column(
children: <Widget>[
const Text('TextData'),
Expanded(
child: Container(
color: Colors.green,
child: Text("Your Text Data",),
),
),
const Text('Add Other Widgets'),
],
),
),
],
),
I have a ListView.builder where I want to show containers with shadows. And I want a shadow of one container to cover another container. Example of how it should looks.
It easily to do with Stack widget, but I have no idea how to do it inside ListView.builder.
Solution that works fine for me
Instead of using ListView I've decided to use CustomScrollView that takes slivers as parameters. Inside slivers I'm maping through a list of items and return my container wrapped with SliverToBoxAdapter. I don't know exactly how it works, but it works fine for me.
CustomScrollView(
slivers: [
...names.map(
(e) => SliverToBoxAdapter(
child: Center(
child: CustomContainer(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('Container #${e['name']}'),
Text('Age is ${e['age']} y.o.')
],
),
),
),
),
),
),
],
),
// if scroll view overflow on other widget then use ClipRRect With Expanded.
ClipRRect(
child: Expanded(
child: CustomScrollView(
clipBehavior: Clip.none, //add this line inside CustomScrollView
slivers: [
...names.map(
(e) => SliverToBoxAdapter(
child: Center(
child: CustomContainer(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('Container #${e['name']}'),
Text('Age is ${e['age']} y.o.')
],
),
),
),
),
),
),
],
),),),
I face the same problem and i use this tricks and it's solved.
You can use index of listview and give different elevation of card according to index.
ListView.builder(
itemCount:10,
shrinkWrap: true,
itemBuilder: (ctx, i) {
return Card(
elevation: (i%2 == 1)?10 :0,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
crossAxisAlignment:CrossAxisAlignment.center,
mainAxisAlignment:MainAxisAlignment.center,
children: [
Text("Container $i"),
],
),
),
);
}),
If I use the following structure in the Scaffold:
body: Container(
alignment: Alignment.center,
child:
Text('Test')
)
Then the text is vertically and centrally structured, as I want. But if I do the following:
body: Container(
alignment: Alignment.center,
child:
ListView(
children:people.map(person).toList(),
),
)
Then the ListView is stuck to the top left of the body and isn't centered.
Why is that, and how can I center the ListView the same way that Text was centered?
Vertical
body: Container(
alignment: Alignment.center,
child:
ListView(
shrinkWrap: true,
children:people.map(person).toList(),
),
)
Horizontal
ListView(
shrinkWrap: true,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('text'),
],
),
Text('text'),
Text('text'),
],
),
It's because ListView take all the space available. To tell Listview to take only children sizes, add property "shrinkWrap" to true.
Center(
child: ListView(
shrinkWrap: true,
children: <Widget>[
Center(
child: Text("Hello world !"),
),
],
),
)
i need to fix overflowed pixel, but when i use SingleChildScrollView, it just show white screen
Widget build(BuildContext context) {
SizeConfig().init(context);
return Scaffold(
appBar: buildAppBar(),
body:
Container(
child: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Flexible(flex:5, child: Textselamatdatang(), ),
Flexible(flex:4, child:
Container(
child: Column(
children: <Widget>[
Loginformcontrainer(),
SizedBox(height: 30,),
Loginbutton()
],
),
)
) ),
],
),
),
),
);
}
This is for your Flexibles Widgets . In SingleChildScrollView you should define height for objects and you can't use Expanded or Flexible Widget.
I removed Your Flexible Widgets and your code works fine
I have a question, how do I make a image on top of a listview and still be able to scroll on the listview? Like scroll though the image, so the image is not moving.
When I stack them with 'stack widget' I still can't scroll, only in the parts of the scrollview that dosn't have an image on top of it.
Please help me, this is like a big part of my app that i've been developing for 6 weeks now, and if I can't make it work, my app is kinda done for it!
Here's an example:
Stack(
children: <Widget>[
ListView(
controller: scrollController,
children: <Widget>[
Container(
child: Text('widget 1'),
),
Container(
child: Text('widget 2'),
),
Container(
child: Text('widget 3'),
),
],
),
Image.asset('assets/myImage.png'),
],
),
You can wrap the image with an IgnorePointer widget:
Stack(
children: <Widget>[
ListView(
controller: scrollController,
children: <Widget>[
Container(
child: Text('widget 1'),
),
Container(
child: Text('widget 2'),
),
Container(
child: Text('widget 3'),
),
],
),
IgnorePointer(child: Image.asset('assets/myImage.png')),
],
),