I'm new at flutter. I coded an example from youtube. At the home screen I have a text at the top:
#override
Widget build(BuildContext context) {
return Container(
alignment: Alignment(0, -0.5),
child: Text(
gameHasStarted ? '' : 'My App',
style: TextStyle(color: Colors.white, fontSize: 25),
),
);
}
}
Now I want to show another text at the bottom. Or on a another position. How to do that? I tried it with Row and Column but, then the two texts are depended from each other.
Thanks
Screenshot
You need to wrap this part with Stack and set your Text where you want
Stack(
children: const [
Positioned(
top: 10,
left: 50,
child: Text("Hello"),
),
Positioned(
bottom: 50,
right: 110,
child: Text("Hello"),
),
],
)
or also use with align in stack
Stack(
children: const [
Align(
alignment: Alignment.topLeft,
child: Text("Hello3"),
),
Align(
alignment: Alignment.bottomRight,
child: Text("Hello4"),
)
],
)
Maybe after wrapping both text with column ,
give mainAxisAlignment.spaceBetween .
Let me know if this solves your problem.
Only if you could provide a preview of screen, I could provide more help.
The easiest solution would be using the column and setting its properties
Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
crossAxisAlignment: CrossAxisAlignment.center,
children:[
Text('My App'),
Text('My Text'),
],
),
Related
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.
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 have the following code:
body: Column(
children: <Widget>[
Stack(
children: <Widget>[
Container(color: AppColors.LIGHT_BLUE, height: 75),
Positioned(
top: 50,
left: 0,
right: 0,
child: Center(
child: _buildAvatar(
Provider.of<AuthService>(context).getLoggedInUser(),
))),
],
),
Text(user.displayName, style: TextStyle(fontSize: 20))
],
)
which results in the Positioned avatar being clipped:
What am I doing wrong here? Is it incorrect to put a Stack inside of a Column like this? Or, do I need to wrap the Stack in something else?
I think the reason is you put the image into your Positioned widget. Stack widget is used when you want to put some widget in front of a widget.
So i think it have to be like this
body: Column(
children: <Widget>[
Container(
Stack(
children: <Widget>[
Image.network(url); // Image here
Positioned(
top: 50,
left: 0,
right: 0,
child: Center(
child: //Some widget front image (may be Text)
),
],
),
),
Text(user.displayName, style: TextStyle(fontSize: 20))
],
)
And I recommend you to use Expended widget with flex in your column so that you can divide it into many part with height of the part depend on flex.
I have a stack widgets with two widgets inside.
One of them draws the background, the other one draws on top of that.
I want both widgets to have the same size.
I want the top widget, which is a column, to expand and fill the stack vertically to the size that is set by the background widget.
I tried setting the MainAxis mainAxisSize: MainAxisSize.max but it didn't work.
How can I make it work?
Use Positioned.fill
Stack(
children: [
Positioned.fill(
child: Column(
children: [
//...
],
),
),
//...
],
);
More info about Positioned in Flutter Widget of the Week
How does it work?
This is all about constraints. Constraints are min/max width/height values that are passed from the parent to its children. In the case of Stack. The constraints it passes to its children state that they can size themselves as small as they want, which in the case of some widgets means they will be their "natural" size. After being sized, Stack will place its children in the top left corner.
Positioned.fill gets the same constraints from Stack but passes different constraints to its child, stating the it (the child) must be of exact size (which meant to fill the Stack).
Positioned.fill() is the same as:
Positioned(
top: 0,
right: 0,
left: 0,
bottom:0,
child: //...
)
For even more examples and info: How to fill a Stack widget and why? and Understanding constraints.
You can try wrapping the Column with a positioned widget. Set top to 0 and bottom to 0. This will make the column fill the stack vertically.
sample code:
Stack(
children: <Widget>[
// Background widget rep
Container(
color: Colors.pink,
),
Positioned(
top: 0,
bottom: 0,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('madonna'),
Text('flutter'),
],
),
)
],
)
I think you could wrap you column in a container like this:
Container(
height: double.infinity,
width: double.infinity,
child: Column()
),
The accepted answer did not answer my issue completely. So, I put my code here in case you have a similar issue.
class NoContentView extends StatelessWidget {
const NoContentView({Key? key, required this.message}) : super(key: key);
final String message;
#override
Widget build(BuildContext context) {
return Expanded(
child: Stack(
children: [
Positioned.fill(
child: FittedBox(
child: const Image(image: AssetImage(AppImages.noReceiptsWeb), fit: BoxFit.fitWidth),
),
),
MessageView(message: message),
],
),
);
}
}
In my case, I thought that I needed to expand the container in the light blue color with an expanded widget inside the stack widget.
Problems arose, especially since I was adding the stack widget in the column widget, and the way to make the container double.infinity dimensions I definitely had a problem with the vertical axis.
In the end, I managed to show it like this photo...
Column(
children: [
//filter
Container(
color: orange,
height: 50,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
Padding(
padding: const EdgeInsets.fromLTRB(20, 0, 20, 0),
child: Text(
'All',
style: getRegular(color: white.withOpacity(.6)),
),
),
Container(
color: white.withOpacity(.6),
width: 1,
height: 50,
),
Padding(
padding: const EdgeInsets.fromLTRB(20, 0, 10, 0),
child: Text(
'Ready',
style: getRegular(color: white.withOpacity(.6)),
),
),
freeh(),
Container(
color: white.withOpacity(.6),
width: 1,
height: 50,
),
],
),
Row(
children: [
Icon(
filter,
color: white.withOpacity(.7),
size: 20,
),
Text(
'FILTER',
style: getLight(
color: white.withOpacity(.7),
),
),
freeh(),
],
),
],
),
),
Expanded(
child: Stack(
alignment: Alignment.topLeft,
children: [
Container(
color: lightBlue, //here to use map>>>>
),
Container(
height: 35,
width: 120,
margin: const EdgeInsets.all(20),
decoration: BoxDecoration(
color: primary,
borderRadius: BorderRadius.circular(20),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Icon(
FontAwesomeIcons.listUl,
color: white.withOpacity(.8),
size: 20,
),
Text(
'List View',
style: getRegular(color: white.withOpacity(.8)),
)
],
),
),
],
),
)
],
),
I'm trying to bottom-center a widget at the bottom of a Column, but it keeps aligning to the left.
return new Column(
new Stack(
new Positioned(
bottom: 0.0,
new Center(
new Container(),
),
),
),
);
The existence of the Positioned forces the Container to the left, instead of centering. Removing the Positioned, however, puts the Container in the middle-center.
Align is the way to go if you have only one child.
If you have more, consider doing something like this:
return new Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
// Your elements here
],
);
The easiest and the correct way to do it - use Spacer()
Example:
Column(
children: [
SomeWidgetOnTheTop(),
Spacer(),
SomeCenterredBottomWidget(),
],
);
Expanded(
child: Align(
alignment: FractionalOffset.bottomCenter,
child: Padding(
padding: EdgeInsets.only(bottom: 10.0),
child: //Your widget here,
),
),
),
I have used this approach,
What i want is, A layout always in bottom but whenever Keyboard pops-up that layout also comes over it
body: Container(
color: Colors.amber,
height: double.maxFinite,
child: new Stack(
//alignment:new Alignment(x, y)
children: <Widget>[
new Positioned(
child: myWidget(context, data.iconName, Colors.red),
),
new Positioned(
child: new Align(
alignment: FractionalOffset.bottomCenter,
child: myWidget(context, data.iconName, Colors.green)
),
)
],
),
),
1) You can use an Align widget, with FractionalOffset.bottomCenter.
2) You can also set left: 0.0 and right: 0.0 in the Positioned.
Just expanding the answers:
Spacer is an option no one mentioned yet; it is used in case you prefer not to use Positioned / Align.
Align works if you want to specify the alignment of a child inside a parent. Use it anywhere but directly inside Stack
Positioned is similar to Align, but works only under Stack directly.
Design everything using Expanded() is one of the easiest way to do this
Column(
children: [
Expanded(
child: Placeholder(),
flex: 1,
),
Expanded(
child: Placeholder(),
flex: 10,
),
Expanded(
flex: 2,
child: Placeholder(),
)
],
),
If you wish to leave content as it, can wrap it with scrollable.
Useful if you have inputs in the children:
return Stack(
children: <Widget>[
Positioned(
child: SingleChildScrollView(
child: Column(
children: children
..add(Container(
height: 56, // button heigh, so could scroll underlapping area
)))),
),
Positioned(
child: Align(
alignment: Alignment.bottomCenter,
child: button,
),
)
],
);
Widget _bottom() {
return Column(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Expanded(
child: Container(
color: Colors.amberAccent,
width: double.infinity,
child: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: new List<int>.generate(50, (index) => index + 1)
.map((item) {
return Text(
item.toString(),
style: TextStyle(fontSize: 20),
);
}).toList(),
),
),
),
),
Container(
color: Colors.blue,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
'BoTToM',
textAlign: TextAlign.center,
style: TextStyle(fontSize: 33),
),
],
),
),
],
);
}
Wrap your Container in SingleChildScrollView() widget. Then it will not come above when keyboard pops up.
In addition of Stack:
to avoid floating container on keyboard, use this
return Scaffold(
appBar: getAppBar(title),
resizeToAvoidBottomInset: false,
body: