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'),
],
),
),
],
),
Related
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 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: ...
),
],
),
),
)
I am trying to build a view as in the image below.
The tweet your reply is just stack at the bottom while the other stuff are scrollable.
I've been banging my head on how to achieve this for a couple of hours.
Exactly;y like in the image below. There are four sections:
The post (tweet)
The row of icons
The comments (which scrolls)
The tweet your reply which is static
The solution would be to use the Align Widget. So in your Stack you would put as the last element in the stack:
Align(
alignment: Alignment.bottomCenter,
child: // your widget would go here
),
I'm judging by your question that you have figured out how to do all of the other parts, and was just wondering about the bottom part. You can use Align to align things in other ways as well (such as topCenter, bottomLeft, etc). Hope this helps, and if so please up vote and accept as answer and if not leave a comment below.
Edit:
I wouldn't use a Stack. I would wrap the entire widget tree in a Column, and put the post in a Expanded Widget with a flex factor of 1, and a Row of Icons below it. Then put a ListView in an Expanded Widget with a flex of 4 (you can experiment with values). And lastly in the Column I would add you "Tweet you reply" Widget.
Simple layout code to give you an idea of how to implement it:
Column(
children: <Widget>[
Expanded(
child: ListView(
shrinkWrap: true,
children: <Widget>[
//your post
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
// your icons
],
),
//your comments
],
),
),
Align(
alignment: Alignment.bottomCenter,
child: // you textField,
),
],
)
Try this
class Home extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Expanded(
child: Column(
children: <Widget>[
Container(
padding: EdgeInsets.all(50),
child: Center(
child: Text(
"A POST"
),
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
Icon(Icons.details),
Icon(Icons.print),
Icon(Icons.translate),
Icon(Icons.map)
],
),
Expanded(
child: ListView(
children: List.generate(10, (index) => ListTile(title: Text("Comment $index"),)),
),
)
],
),
),
TextField(
decoration: InputDecoration(
labelText: "Tweet your reply"
),
)
],
),
),
);
}
}
The output:
If you want the post to scroll with it, this should help
import 'package:flutter/material.dart';
class Home extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Expanded(
child: SingleChildScrollView(
child: Column(
children: <Widget>[
Container(
padding: EdgeInsets.all(50),
child: Center(
child: Text(
"A POST"
),
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
Icon(Icons.details),
Icon(Icons.print),
Icon(Icons.translate),
Icon(Icons.map)
],
),
Column(
children: List.generate(10, (index) => ListTile(title: Text("Comment $index"),)),
)
],
),
),
),
TextField(
decoration: InputDecoration(
labelText: "Tweet your reply"
),
)
],
),
),
);
}
}
in this simplified code i have two TextFormField into one of flutter PageView pages, that they are into another class which that extended from Container, not any Scaffold, now when i click into one of this TextFormFields, resizeToAvoidBottom* don't work in my code
Widget build(BuildContext context) {
return Consumer<ThemeManager>(builder: (context, theme, child) {
return Directionality(
textDirection: TextDirection.rtl,
child: Scaffold(
key: _scaffoldKey,
backgroundColor: theme.accentColor,
resizeToAvoidBottomPadding: false,
resizeToAvoidBottomInset: false,
body: NotificationListener<OverscrollIndicatorNotification>(
onNotification: (overScroll) {
overScroll.disallowGlow();
return false;
},
child: Container(
width: double.infinity,
height: double.infinity,
child: IntrinsicHeight(
child: Stack(
children: <Widget>[
Container(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height - 50,
child: Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
BuildLoginHeaderScreen(theme: theme),
Expanded(
child: PageView(
controller: _pageController,
children: <Widget>[
... // contains two TextFormFields
],
),
),
],
),
),
],
),
),
),
),
),
);
});
}
You can go around using resizeToAvoidBottomPadding by wrapping appropriate part of your code with SingleChildScrollView. For example
child: SingleChildScrollView(
child: Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
BuildLoginHeaderScreen(theme: theme),
Expanded(
child: PageView(
controller: _pageController,
children: <Widget>[
... // contains two TextFormFields
],
),
),
],
),
),
This will prevent pixel overflow when the keyboard reduces the view area.