I want to make children use flexible sizes
how can i set the size of the child inside the row? can you guys help me? and find the error constraint
anyone help me
return SafeArea(
child: Column(
children: [
SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
children: [
Container(
color: Colors.lightBlue,
child: Row(
children: [
Expanded(
flex: 5,
child: Container(
color: Colors.green,
),
),
Expanded(
flex: 5,
child: Container(
color: Colors.blue,
),
)
],
),
)
],
),
)
],
),
);
To place children in a row you can use Flexible widget. The value of flex defines how much space each child should take. In the example that you provided.. Both children will be equally spaced since you gave flex value 5 for both.
return Scaffold(
body: Center(
child: SizedBox(
height: 50,
child: Row(
children: [
Flexible(
flex: 5,
child: Container(
color: Colors.red,
)),
Flexible(
flex: 5,
child: Container(
color: Colors.green,
)),
],
),
),
),
);
If you change the flex value to 1 and 5.. Now the total divisions will be 6 and out of that the first child will take 1 part and the second child will take 5 parts like below
return Scaffold(
body: Center(
child: SizedBox(
height: 50,
child: Row(
children: [
Flexible(
flex: 1,
child: Container(
color: Colors.red,
)),
Flexible(
flex: 5,
child: Container(
color: Colors.green,
)),
],
),
),
),
);
Also if you use a singleChildScrollView and an expanded inside that it then the expanded widget has no bounds so it will throw an error. So wrapping the Expanded with a SizedBox with a specific width will give you expected results.
EDIT
To have a SingleChildScrollView with dynamic content in the row you can do this
SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
mainAxisSize : MainAxisSize.min,
children:[
SizedBox(
width: 100,//this is important since its a row and the row will take full width and throw an error.
child: Image.asset(""),
),
//Another SizedBox or Text or any widget..
]
)
)
Related
I'm facing some problem by composing layout of my App.
My widget at the end sould look like this
This is my code
Row(
mainAxisSize: MainAxisSize.max,
children: [
Column(
children: [
// Widget A
SizedBox(
height: widget.screenHeight * 0.9,
child: AspectRatio(
aspectRatio: 16 / 9,
child: Container(
color: Colors.red,
),
),
),
// Widget B
Container(
height: widget.screenHeight * 0.1,
color: Colors.green,
)
],
),
// Widget C
Expanded(
child: Container(
color: Colors.pink,
),
)
],
)
I want Widget A to occupy 90% of screen height and mantain a 16/9 aspect ratio, Widget B to occupy remaining 10% height and have the same width of his sibling, and Widget C to fill remaining space
With that code, Widget A and Widget C are showed correctly, but widget B doesn't fill his space as i expect.
What's wrong?
Column(
children: [
Expanded(
child: Row(
children: [
Expanded(
flex: 2,
child: Column(
children: [
Expanded(
flex:4,
child: Container(
color: Colors.yellow,
),
),
Expanded(
flex: 1,
child: Container(
color: Colors.blue,
),
)
],
),
),
Expanded(
flex: 1,
child: Container(
color: Colors.green,
),
),
],
),
)
],
),
you have to play with the expanded widget
So I'm working on my first Project. Basically I want to alignment 4 containers equally. they should have same size H/W so i could scroll on them whenever extra data has been put into them later.....
Here's my Code
Widget build(BuildContext context) {
return Center(
child: Scaffold(
body: Center(
child: Padding(
padding: const EdgeInsets.all(20.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Row(
children: [
Row(
children: [
VerticalText1(),
DoBuilder(),
],
),
Column(
children: const [
SizedBox(
width: 10,
)
],
),
Column(
children: [
DecideBuilder(),
],
),
],
),
Row(
children: const [
SizedBox(
height: 10,
)
],
),
Row(
children: [
Row(
children: [
VerticalText2(),
DelegateBuilder(),
],
),
Column(
children: const [
SizedBox(
width: 10,
)
],
),
Align(
alignment: Alignment.bottomLeft,
child: DeleteBuilder(),
),
So I'm working on my first Project. Basically I want to alignment 4 containers equally. they should have same size H/W so i could scroll on them whenever extra data has been put into them later.....So I'm working on my first Project. Basically I want to alignment 4 containers equally. they should have same size H/W so i could scroll on them whenever extra data has been put into them later.....
for me I'm also a beginner in flutter but I know something that if you want actual size for container and you want it to be some kind of responsive you have 2 ways to do that:
first you can use:
(Mediaquery).of(context).size.width or
(media.query).of(context).size.height
that will give you the size of your screen and you can use as much as you need from it for each container for example:
Container(
child:,
width: (MediaQuery.of(context).size.width / 2))
that will give you half of your screen width what ever the device run the app the size will be the same for the screen size
and other way you can use expanded widget:
put every container in expanded widget and give the flex parameter value of one
here is an example:
Row(children:[
Expanded(flex:1,child:Container()),
Expanded(flex:1,child:Container()),]),
expanded will sum the flexes and will divide the space of the screen on element all equal repeat the above code in single Column has 2 Rows and I hope your code will work as you want
Instead of row and column, you should try with the GridView otherwise you can try with media query height and width.
GridView.builder(
itemCount: 4,
gridDelegate:
SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemBuilder: (BuildContext context, int index) {
return new Card(
child: Container(
color: Colors.green,
child: Center(child: Text("$index"),),
),
);
},
)
And Using Column and row
idget build(BuildContext context) {
double height = MediaQuery.of(context).size.height;
double width = MediaQuery.of(context).size.width-20;
return Scaffold(
appBar: AppBar(
title: Text("widget.title"),
),
body: Stack(
children: [
Column(
children: [
Expanded(
child: Row(
children: [
Container(
height: height / 2,
width: width/2,
color: Colors.green,
),
SizedBox(width: 10,),
Container(
height: height / 2,
width: width / 2,
color: Colors.green,
)
],
),
),
SizedBox(height: 10,),
Expanded(
child: Row(
children: [
Container(
height: height / 2,
width: width / 2,
color: Colors.green,
),
SizedBox(width: 10,),
Container(
height: height / 2,
width: width / 2,
color: Colors.green,
)
],
),
),
],
),
Center(
child: Padding(
padding: const EdgeInsets.only(right:10.0),
child: CircleAvatar(child: Icon(Icons.home),),
),
)
],
),
);
}
Output:
Is there a way to have a fixed size for the child inside GridView? I wanted to have the red color be same height. I tried using Expanded or specified the size for the Container, but it just won't work. GridView just makes the child same size.
Note: I tried specify the height for the red Container. It didn't work.
This is what I got.
This is what I did.
return GridView.count(
crossAxisCount: 2,
children: List.generate(drinksData.length, (index) {
return Container(
padding: EdgeInsets.all(20.0),
child: Column(
children: [
Expanded(
child: Container(
color: Colors.red,
),
),
Text(drinksData[index].label),
],
),
);
}),
);
GridView.count(
crossAxisCount: 2,
children: List.generate(drinksData.length, (index) {
return Container(
padding: const EdgeInsets.all(20.0),
child: Column(
children: [
Expanded(
child: Container(
// height:90,//or whatever size you want!
color: Colors.red,
),
),
SizedBox(
height: 45,
child: Text(drinksData[index])
),
],
),
);
}),
)
```
Here is my widget:
return Card(
child: Container(
height: 150,
child: Row(
children: <Widget>[
Placeholder(
fallbackHeight: 100,
fallbackWidth: 100,
),
Container(
width: _deviceHeight,
color: Colors.red,
child: Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Flexible(
child: Text(
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasssssaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
overflow: TextOverflow.ellipsis,
maxLines: 4,
)),
// Expanded(flex: 8, child: Text("bbb")),
Flexible(child: Text("bbb")),
// Flexible(child: Text("aaa")),
],
),
)
],
),
));
I expected that text will be placed on new line, but I am getting overflow:
Wrap your inner Container with an Expanded to provide it with the available parent constraints, otherwise the Container has infinite height and will result in an overflow (because you are on landscape).
Expanded(
child: Container(
width: _deviceHeight,
color: Colors.red,
child: Column(
...
You could wrap the second element of the Row with Flexible, like this:
Row(
children: <Widget>[
Placeholder(..),
Flexible(
child: Container(
color: Colors.red,
child: Column(...
Inside the Row you need Placeholder to keep its width and Container width to be flexible.
Edit: And you should remove the width of the Container, since it would be flexible and it should take as much as possible to fit the screen.
Can I position a widget based on another widget?
like this:
Tiled Layout
Without
flutter_staggered_grid_view Library
There is no Widget similar to ConstraintLayout but you can achieve what you want using different widgets, like this example:
class Testing2 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Container(
color: Colors.red,
child: Row(
children: <Widget>[
Flexible(
child: Column(
children: <Widget>[
Flexible(
flex: 1,
child: Container(
color: Colors.deepOrange,
),
),
Flexible(
flex: 2,
child: Container(
color: Colors.lightBlue,
),
),
],
),
),
Flexible(
child: Column(
children: <Widget>[
Flexible(
flex: 3,
child: Container(
color: Colors.orange,
)),
Flexible(
flex: 1,
child: Row(
children: <Widget>[
Flexible(
flex: 2,
child: Container(
color: Colors.blue,
)),
Flexible(child: Container(color: Colors.green))
],
),
)
],
),
)
],
),
);
}
Also you can take a look this link to know about Layout Widgets: https://flutter.io/widgets/layout/
You can try this:
https://github.com/hackware1993/Flutter-ConstraintLayout
Build flexible layouts with constraints, Similar to Android ConstraintLayout.
No matter how complex the layout is and how deep the dependencies are, each child element of ConstraintLayout will only be measured once, This results in extremely high layout performance.