here is the UI that I'm trying to build
but this is the output
I tried alignment also , but that also didn't working
but when setting a fixed height this is working fine
but I can't fill this using the fit parameter,
here is the code
Scaffold(
backgroundColor: kDarkTheme,
body: SafeArea(
child: Column(
children: [
const SizedBox(height: 10),
Row(
//code for top button
),
const SizedBox(height: 150),
Stack(
children: [
Center(
child: CircleAvatar(
radius: radiusSize + 5,
backgroundColor: kDarkCounterColor,
child: CircleAvatar(
backgroundColor: kDarkTheme,
radius: radiusSize,
),
),
),
Center(
child: Padding(
padding: const EdgeInsets.only(top: 35),
child: Text(
'39',
style: GoogleFonts.italiana(
fontSize: 120, color: kDarkCounterColor),
),
),
),
],
),
const SizedBox(height: 15),
const Text(
'Tap To Count',
style: TextStyle(
fontFamily: 'Helvatica',
color: Color(0xff656158),
),
),
Expanded(
child: Align(
alignment: Alignment.bottomRight,
child: SvgPicture.asset(
kDarkThemeImage,
)),
)
],
),
))
this is the code
then the first error appears again. how could I fix this?
You are using the Expanded widget on a column that doesn't have a set size. Try adding MainAxisSize attribute to your column, like this:
Column(
mainAxisSize: MainAxisSize.max, // Add this like
children: [
...
This will make your column fit the whole available size on the previous widget (a scaffold for the whole screen). Then the expanded widget will fill the remaining space not used by the other widgets inside the column.
Related
Hi trying to figure out why my hamburger is getting misaligned when i add another Expanded() code within the body.
I tried to follow this url to develop a hamburger menu and responsive for all platforms at once.
Flutter Blog
Below is the code that i tried where i added Expanded() below the Row()
final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
#override
Widget build(BuildContext context) {
final width = MediaQuery.of(context).size.width;
return Scaffold(
key: _scaffoldKey,
drawer: AppDrawer(),
body: Row(
children: [
Row(
children: [
Padding(
padding: const EdgeInsets.all(16),
child: IconButton(
icon: Icon(Icons.menu, size: 30),
onPressed: () {
_scaffoldKey.currentState.openDrawer();
}),
),
],
),
Expanded(
child: Container(
width: width,
child: Column(
children: [
Expanded(
child: Lottie.network(
'https://assets2.lottiefiles.com/datafiles/6WfDdm3ooQTEs1L/data.json'),
),
Expanded(
child: Column(
children: [
Flexible(
child: Text(
"Multivariate Testing",
style: GoogleFonts.montserrat(
fontSize: 50,
),
),
),
SizedBox(
height: 10,
),
Flexible(
child: Text(
'Run experiments to make key flows more effective.',
style: GoogleFonts.montserrat(
fontSize: 25,
),
),
),
SizedBox(
height: 35,
),
// ignore: deprecated_member_use
TextButton(
onPressed: () {},
child: Text(
'Create Experiment',
style: GoogleFonts.montserrat(
fontSize: 20,
),
),
)
],
),
),
],
),
),
)
],
),
);
}
}
and the output that i am seeing from mobile view. Appreciate any help. Sorry for too big screenshot!
This is because of the default functionality of Row.
So change your first child for your top level Row to this,
Scaffold(
key: _scaffoldKey,
drawer: AppDrawer(),
body: Row(
children: [
Align(
alignment: Alignment.topCenter,
child: Padding(
padding: const EdgeInsets.all(16),
child: IconButton(
icon: Icon(Icons.menu, size: 30),
onPressed: () {
_scaffoldKey.currentState.openDrawer();
})),
),
Expanded( ...... rest of your code
Here, we are using the Align widget with alignment: Alignment.topCenter.
Align widget takes the entire available space in the parent and then depending on the alignment property, aligns it't child inside it.
So, saying Alignment.topCenter will place it at the top vertically and middle horizontally.
Using an AppBar will unnecessarily complicate your situation since now, the AppBar is going to take up space a the top, but in your case, you want your Lottie view to be visible at the top, so it will overlap.
Because Expanded fills up the whole space and that's why your hamburger is getting misaligned.
Why don't you try using appbar for the hamburger?
I'm building a product detail page. As the following piece of code and image shown, when there is a lot of content in the description part, the bottom overflow will occur. I'm wondering how to make the page scrollable, I've tried wrapping the Stack with SingleChildScrollView, but this is definitely not working in my case here. Can anyone help me with that? Thank you very much!!!!!
class DetailsScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
final size = MediaQuery.of(context).size;
return Scaffold(
backgroundColor: Colors.white,
body: Stack(
children: [
buildBody("path/to/image", size),
],
),
);
}
Positioned buildBody(String imagePath, Size size) {
return Positioned.fill(
child: Column(
children: [
Expanded(
child: Container(
padding: EdgeInsets.symmetric(vertical: 60, horizontal: 30),
color: Colors.green,
child: Stack(
children: [
Align(
alignment: Alignment.center,
child: Hero(
tag: 1,
child: Image.asset(
imagePath,
width: size.width * 0.7,
),
),
),
],
),
),
),
Expanded(
child: Container(
color: Colors.white,
child: Column(
children: [
SizedBox(
height: 100,
),
Container(
margin: EdgeInsets.symmetric(
horizontal: 20,
),
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
CircleAvatar(),
SizedBox(
width: 10,
),
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Anvesha Shandilya',
style: TextStyle(
fontWeight: FontWeight.bold, fontSize: 16),
),
Text(
'Owner',
style: TextStyle(
color: fadedBlack,
),
),
],
),
Expanded(child: Container()),
Text(
'Dec 16, 2020',
style: TextStyle(
color: fadedBlack,
fontSize: 12,
),
),
],
),
),
SizedBox(
height: 30,
),
Container(
margin: EdgeInsets.symmetric(
horizontal: 20,
),
child: Text(
'A lot of content..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................',
style: TextStyle(
color: fadedBlack,
height: 1.7,
),
),
),
],
),
),
),
],
),
);
}
}
Error: Bottom Overflowed
To reproduce: Change the path/to/image, to this: A image can be used with the code:
tl;dr remove Expanded widgets -> remove Stack -> replace Column with ListView (for scrollability)
Start by removing Expanded widgets from the tree as you don't really need them. If possible, you should use mainAxisAlignment and crossAxisAlignment to position your widgets. That's exactly how you should handle placing the date next to user's name.
Expanded documentation states with which widgets you can use it:
Creates a widget that expands a child of a Row, Column, or Flex so
that the child fills the available space along the flex widget's main
axis.
Then remove Stack widget. If you don't then it will still work as Stack tries to get as big as its positioned children so it will just get as big as the Column you have inside. It's redundant.
Last but not least, replace Column with ListView. Column doesn't really care about whether it's overflowing or if it's being rendered. So if you create a Column that is bigger than the screen, it will simply display it which will cause the overflow. To fix that you could wrap it SingleChildScrollView, but I think it's more appropriate to just use ListView instead.
Here's an amazing explanation of layout system in Flutter: https://flutter.dev/docs/development/ui/layout/constraints
I am making layout for flutter application
What I want to do is
-----------------------
|[i] [text] |
| |
Icon should be the left (padding 5px)
And text should be the center of screen.
At first I should use the Column
However my layout is not the same proportion
It might be simple though , how can I make it??
Stack() is one of the many options that you can use. Something like this:
Stack(
children:<Widget>[
Padding(
padding: EdgeInsets.only(left: 5),
child: Icon(Icons.info),
),
Align(
alignment: Alignment.topCenter,
child: Text("I'm on the top and centered."),
),
],
),
One way you can do this is something like this..
Widget build(BuildContext context) {
return Column(
children: [
Padding(
padding: EdgeInsets.all(5),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Icon(Icons.info),
Text('text'),
Opacity(opacity: 0, child: Icon(Icons.info)),
],
),
),
Padding(
padding: EdgeInsets.all(5),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Icon(Icons.info),
Text('second text'),
Opacity(opacity: 0, child: Icon(Icons.info)),
],
),
),
],
);
}
Result:
I might be late, but I want this answer to be there, if some one would find it better for the development purposes in future time.
We can make a reusable widget, which we can use it inside the main widget. The widget will accept text, and icon to be passed when called
// IconData is the data type for the icons
Widget myWidget(String text, IconData icon) => Row(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.start,
children: [
// this will be used a left-padding param
SizedBox(width: 20.0),
// using it here
Icon(icon, size: 28.0, color: Colors.greenAccent),
SizedBox(width: 5.0),
// this will take the remaining space, and then center the child
Expanded(child: Center(child: Text(text)))
]
);
To use in the main Widget, just do like this:
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
// calling our widget here
myWidget('FirstText', Icons.alarm),
SizedBox(height: 20.0), // this is used as a top margin
myWidget('SecondText', Icons.notifications)
]
)
If you wanna check out the sources which I used, please see:
Expanded class
SizedBox class
The result you will get is this:
This was an answer I gave a while ago for this same issue, but the other situation was vertical (a Column) instead of horizontal (a Row). Just swap the Row and Columns out for a Column and Rows in this example and you'll get the idea.
My code has grey added in order to show the difference between the two approaches.
A Stack will work, but it's overkill for this, this kind of problem is part of why we have Expandeds and Flexibles. The trick is to use three Flexibles (2 Expandeds and a Spacer). Put the Spacer on top. It and the bottom Expanded must have the same flex value in order to center the middle Expanded.
import 'package:flutter/material.dart';
class CenteringOneItemWithAnotherItemInTheColumn extends StatelessWidget {
const CenteringOneItemWithAnotherItemInTheColumn({
Key key,
}) : super(
key: key,
);
/// Adjust these values as needed
final int sameFlexValueTopAndBottom = 40; // 40%
final int middleFlexValue = 20; // 20%
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Column Alignment Question'),
),
body: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Spacer(),
const Text(
'Cent',
style: TextStyle(
fontSize: 64,
),
),
const Spacer(),
const Text(
'Bot',
style: TextStyle(
fontSize: 64,
),
),
],
),
Column(
children: <Widget>[
/// The key is to have the Spacer and the bottom Expanded
/// use the same value for flex. That will cause the middle
/// child of the Column to be centered vertically.
Expanded(
flex: sameFlexValueTopAndBottom,
child: Container(
width: 100,
color: Colors.grey[300],
),
),
Expanded(
flex: middleFlexValue,
child: const Align(
alignment: Alignment.center,
child: Text(
'Cent',
style: TextStyle(
fontSize: 64,
),
),
),
),
Expanded(
flex: sameFlexValueTopAndBottom,
child: Container(
color: Colors.grey[300],
child: const Align(
alignment: Alignment.bottomCenter,
child: Text(
'Bot',
style: TextStyle(
fontSize: 64,
),
),
),
),
),
],
),
],
),
);
}
}
I've been toying with lists in flutter, and everything is fine. I'm starting to understand the logic of the whole thing.
Now I wanted to do a simple layout like that :
My problem is that I can't find a way to make the first row. I tried to tell Row to let its two children take half and no less no more, but I didn't really find a way. (The inside thing will eventually be buttons.)I tried several things to no avail. Here is the layout I started from :
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Column(children: <Widget>[
Padding(
padding: EdgeInsets.only(top: 50.0),
),
Row(
children: <Widget>[
Padding(
padding: EdgeInsets.only(
top: buttonPaddingTop,
left: buttonPaddingSide,
right: buttonPaddingSide),
child: ButtonTheme(
child: FlatButton(
onPressed: () {},
color: Colors.grey,
child: const Text('LARGE TEXT',
overflow: TextOverflow.ellipsis,
style: TextStyle(fontSize: buttonFontSize)),
),
),
),
Padding(
padding: EdgeInsets.only(
top: buttonPaddingTop,
left: buttonPaddingSide,
right: buttonPaddingSide),
child: ButtonTheme(
child: FlatButton(
onPressed: () {},
color: Colors.grey,
child: const Text('LARGE TEXT',
overflow: TextOverflow.ellipsis,
style: TextStyle(fontSize: buttonFontSize)),
),
),
),
],
),
]),
),
);
}
Should I continue trying like this, or should I try another object than Row to arrange the layout ?
Expanded takes as much space as available in this case horizontally. That means if you would use 2 Expanded widgets inside your Row, the space will be divided by half.
Try this:
Column(
children: <Widget>[
Row(
children: <Widget>[
Expanded(
child: Text('first half'),
),
Expanded(
child: Text('second half'),
),
],
),
Row(
children: <Widget>[
Expanded(
child: Text('first half'),
),
Expanded(
child: Text('second half'),
),
],
),
Row(
children: <Widget>[
Expanded(
child: Text('full width'),
)
],
),
],
)
Make sure you read more about Flutter widgets, for example watch this video (and other ones in this series):
https://www.youtube.com/watch?v=_rnZaagadyo
I'm attempting to layout some buttons in a flutter app towards the bottom of the screen as seen here:
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
centerTitle: true,
),
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('images/foo.jpeg'),
fit: BoxFit.cover),
),
child: Column(
children: <Widget>[
Padding(
padding: EdgeInsets.only(top: 10),
child: _buttonsOne(),
),
Expanded(
child: Text(''),
),
Padding(
padding: EdgeInsets.only(bottom: 10),
child: _buttonsTwo(),
),
],
),
),
);
Counter buttons is setup thusly:
Widget _buttonsTwo() {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
_oneButton(),
_twoButton(),
_threeButton(),
_fourButton()
],
);
}
My problem is two of the buttons are using glyphs that cause them to be just right of center. Prior to attempting this layout I structured raised buttons with columns so that I could use an Align to pull these icons to the left a bit, as seen here for one of the buttons:
Widget _threeButton() {
return RaisedButton(
onPressed: () {},
elevation: 10,
color: Colors.red,
textColor: Colors.white,
padding: EdgeInsets.all(10.0),
child: Column(
children: <Widget>[
Align(
alignment: Alignment(-0.4, 0),
child: Icon(
Class.icon_name,
size: 30,
),
),
Text(
_fooCount.toString(),
style: TextStyle(fontSize: 25),
)
],
),
);
}
And here's the result I'm getting:
As you can see, the icons for the two rightmost buttons are still a little to the right. I've tried using RaisedButton.icon to no avail as it causes the icons to overlap the text, even restructuring them in a row to try and make wider buttons. What am I missing?
Try using Transform widget instead of Align and translate the X axis:
Transform(
transform: Matrix4.identity()..translate(-7.0),
child: Icon(
FiveRingsDB.conflict_political,
size: 30,
),
),
Text(
_militaryCount.toString(),
style: TextStyle(fontSize: 25),
)