Why 2 expanded widgets' widths not equal
Between the Personal widget and Sick Widget. You will see the number zero text that does not align with the personal widget.
So I find the widget tree of the personal widget to take 73 widths while the sick widget takes 100 widths.
return Container(
margin: const EdgeInsets.only(top: 12.0, right: 4.0, left: 4.0),
child: Column(
children: [
Row(
children: [
Expanded(
child: StatusItem(
img: Assets.images.svgIcons.icPersonal.svg(
width: 20.0,
height: 20.0,
fit: BoxFit.contain,
),
label: translations.personalText,
total: personalLeave,
),
),
const SizedBox(
width: 8,
),
Expanded(
child: StatusItem(
img: Assets.images.svgIcons.icSwitch.svg(
width: 20.0,
height: 20.0,
fit: BoxFit.contain,
color: FigmaColors.slateColor,
),
label: translations.switchText,
total: switchHoliday,
),
),
],
),
const SizedBox(
height: 14.0,
),
Row(
children: [
Expanded(
child: StatusItem(
img: Assets.images.svgIcons.icSick.svg(
width: 20.0,
height: 20.0,
fit: BoxFit.contain,
),
label: translations.sickText,
total: sickLeave,
),
),
Expanded(child: Container())
],
),
],
),
);
Can you explain and fix this one?
Expanded is A widget that expands so that the child fills the
available space.
in first Row you have 3 children :
Expanded , SizedBox, and Expanded
so they will divide by 2 space after reduced the Sizedbox width
in second Row your there is no SizedBox that take any space. thats why Expanded will divide by 2 all the space
how wo fix: add same size of SizeBox to the second Row
Row(
children:[
Expanded(),
SizedBox(width:8),
Expanded(),
])
Related
I was having issues increasing the size of my circular progress indicator and after doing some research I landed on this Stack Overflow question: How to set size to CircularProgressIndicator?
So I wrapped my item in a SizedBox() and increased the height and width and nothing changed.
I Also tried adding an expanded to the circular progress indicator but that didnt work either:
return Expanded(
child: PageView(
controller: pageViewController,
children: [
PackSummaryWeightGraph(
categoryWeightList: categoryWeightList,
totalWeight: totalWeight),
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
SizedBox(
height: 40,
width: 40,
child: CircularProgressIndicator(
value: packedItemsPercent,
),
),
],
),
const Center(
child: Text('Third Page'),
),
],
),
);
Edit:
IS there anyway to do this programmatically so I do not need to set the size of the width and height manually? I just want it to fill the space.
It needs a parent with constraint, try to wrap it inside a Center or Align
Center(
child: SizedBox(
height: 40,
width: 40,
child: CircularProgressIndicator(
value: packedItemsPercent,
),
),
),
Try wrapping the CircularProgessIndicator in a FittedBox like so:
SizedBox(
height: 40,
width: 40,
child: FittedBox(
child: CircularProgressIndicator(
value: packedItemsPercent,
),
),
)
I have these three containers. That the first one needs to grow to cater for the children that will be in it. The second one could have a fixed height say a flex factor of 1, while the third one has a fixed height too say flex of 2. The whole of this screen can be scrollable. It actually has to be scrollable since the children of the first container can be a lot.
Note: the children of the first container will have a fixed height, the container will house a listview or column which will have fixed height children, say containers each of 50.0. How do I achieve this, especially the 'growability' of the first container, while maintaining the heights of the other containers.
What I have currently is
SingleChildScrollView(
child: Container(
height: MediaQuery.of(context).size.height,
child: ListView(
children: [
Flexible(
flex: 1,
child: Container(
color: Colors.blueAccent[200],
child: Column(children: [
Container(
height: 100.0,
color: Colors.greenAccent[200],
),
Container(
height: 100.0,
color: Colors.purpleAccent[200],
),
Container(
height: 100.0,
color: Colors.orangeAccent[200],
)
]),
)),
Expanded(
flex: 1,
child: Container(
color: Colors.redAccent[100],
),
),
Expanded(
flex: 1,
child: Container(
//height: 120.0,
color: Colors.redAccent[400],
),
),
],
),
),
),
Which just brings up lots and lots of errors, does not matter how I lay it out using flexibles and Expanded widgets. Again, I don't need the first container to scroll internally, it should grow according to the number of children in it, while the rest of the two containers maintain their heights.
You can not user Expanded or Flexible inside a scrollable widget since the child of Expanded will then get a height of infinity and the height of the child of Flexible will not get its parents height to compare with.
You can set the height of the bottom two containers based on the height of the screen.
SingleChildScrollView(
child: Container(
height: MediaQuery.of(context).size.height,
child: ListView(
children: [
Container(
color: Colors.blueAccent[200],
child: Column(
children: [
Container(
height: 100.0,
color: Colors.greenAccent[200],
),
Container(
height: 100.0,
color: Colors.purpleAccent[200],
),
Container(
height: 100.0,
color: Colors.orangeAccent[200],
)
],
),
),
Container(
// 33 % of the screen height
height: .33 * MediaQuery.of(context).size.height,
color: Colors.redAccent[100],
),
Container(
// 33 % of the screen height
height: .33 * MediaQuery.of(context).size.height,
color: Colors.redAccent[400],
),
],
),
),
),
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 working on a Flutter project. I'm trying to create a widget like the image below and I can't manage to do it.
So what I'm trying to do, is to create a widget with a Text at the top left (the size of this widget is not constant and depends on the text in it).
I'm trying to align 2 other widgets with the Text:
The Widget 1 is aligned horizontaly and centered with the Text widget and at its right with no space between
The Widget 2's right edge is aligned verticaly with the Text widget's right edge, and is positioned under it (and there is no space between the 2 widgets).
I tried to implement this with Column and Row widgets or with a GridView but I couldn't manage to do so.
Also the overall size of this custom widget has to be shrinked.
Does someone know how to do something like that ?
Thank you.
This works
Container(
width: double.infinity,
height: 300,
color: Colors.grey[200],
child: Column(
children: <Widget>[
Row(
children: [
Flexible(
flex: 2,
child: Container(
height: 200,
color: Colors.blue,
),
),
Flexible(
flex: 1,
child: Container(
height: 100,
color: Colors.green,
),
),
],
),
Row(
children: <Widget>[
Flexible(
flex: 2,
child: Align(
alignment: Alignment.centerRight,
child: Container(
width: 150,
height: 100,
color: Colors.orange,
),
),
),
Flexible(
flex: 1,
child: Container(),
),
],
),
],
),
),
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)),
)
],
),
),
],
),
)
],
),