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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 have this list view in flutter which I am trying to make into a chat list. Similar to what you see in WhatsApp and telegram. However I am struggling to get the idea of how rows and columns work because I keep getting overflows.
Here is the code:
ListView(
physics: BouncingScrollPhysics(),
children: [
Dismissible(
key: Key(""),
background: Container(color: Colors.grey[200]),
direction: DismissDirection.endToStart,
child: InkWell(
onTap: () {},
child: Column(
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Flex(
direction: Axis.vertical,
children: [
Text("Hello"),
],
),
Flex(
direction: Axis.vertical,
children: [
Text(
"al;skdl;aksd a;skd ;aks;dk a;skd ;laks;d a;lsk d;lkas; dka;lsk d;laks; ldka;slk d;a",
overflow: TextOverflow.ellipsis,
maxLines: 2,
),
],
),
],
),
),
),
],
Now we often experience the text overflow problem so if we think it that we we have provided column a particular width and restricted it but if we wrap the things up with flexible widget it now tells column/Row that you can change your size and be flexible
order would be
flexible > Container > Column/Row
The reason we are applying this to container is Column/Row will ask immediate parent for width and height
now this problem can also be solved by text overflow property that is we can clip text but what if we dont want too
So all you have to do is Wrap the column/Row in Container and then into Flexible as now it will tell container that yes you can adjust your height
Your concept can be cleared by how actually widgets parent child relationship works i.e in brief
basically If am a child I will ask my parent okay what is my size so since my parent if it has a size it will bound me but if it doesnt has a size it will ask its parent okay tell me what space should I take and it goes on. Expanded and Flexible says that okay you can adjust yourself instead of being Fixed.
Flexible(
child: Container(
margin: EdgeInsets.only(left: 10.0,right: 10.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('${dataBookTitleSearch1[index]} ', style: kGoodSearchResultTextStyle, textAlign: TextAlign.left,),
SizedBox(
height: 10.0,
),
Text('${dataBookAuthorSearch1[index]}', style: kGoodSearchResultTextStyle,textAlign: TextAlign.left),
SizedBox(
height: 10.0,
),
Text('${dataBookExtensionSearch1[index]} ', style: kGoodSearchResultTextStyle,textAlign: TextAlign.left),
SizedBox(
height: 20.0,
),
Container(
width: 80.0,
height: 40.0,
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(20.0)),
color: Colors.white
),
child: Padding(
padding: const EdgeInsets.only(left:20.0,top: 12.0),
child: Text('Read'),
),
),
],
),
),
)
I have two Container widgets in a Column, each containing a Text widget. I want the Container with the shortest text to expand to match the width of the other container containing the longer text. The container with the longer text should wrap the Text widget and its padding.
I can't get it to work without resorting to fixed widths on the containers:
return Column(
mainAxisSize: MainAxisSize.min,
children: [
// This container has a shorter text than its sibling, so it should expand
// its width to match its sibling/parent
Container(
alignment: Alignment.center,
width: 50, // I don't want this fixed width
decoration: BoxDecoration(color: Colors.orange, borderRadius: BorderRadius.only(topLeft: Radius.circular(4), topRight: Radius.circular(4))),
child: Padding(
padding: const EdgeInsets.fromLTRB(8,4,8,4),
child: Text('short'),
)
),
// This container has a longer text, so it should decide the width of the
// other container (and of the parent Column)
Container(
alignment: Alignment.center,
width: 50, // I don't want this fixed width
decoration: BoxDecoration(color: Colors.orange, borderRadius: BorderRadius.only(bottomLeft: Radius.circular(4), bottomRight: Radius.circular(4))),
child: Padding(
padding: const EdgeInsets.fromLTRB(8,4,8,4),
child: Text('long text here'),
)
),
]
);
I've tried a couple of ways to solve it involving Expanded and Flexible, but they all result in the "red screen of death" (or at least "annoyance").
EDIT
Just to be clear - I want the Column to just wrap its content, i.e. adjust its width to the width of the containers. In summary - everything should be as narrow as possible, except for the container with the shortest text, which should instead be as wide as its sibling (the container with the longer text).
I saw your Fiddle on a comment. And what you need is IntrinsicWidth.
IntrinsicWidth(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
// This container has a shorter text than its sibling, so it should expand
// its width to match its sibling/parent
Padding(
padding: const EdgeInsets.symmetric(vertical: 1.0),
child: Container(
color: Colors.orange,
child: Padding(
padding: const EdgeInsets.fromLTRB(8, 4, 8, 4),
child: Text(
'short',
textAlign: TextAlign.center,
),
),
),
),
// This container has a longer text, so it should decide the width of the
// other container (and of the parent Column)
Padding(
padding: const EdgeInsets.symmetric(vertical: 1.0),
child: Container(
color: Colors.orange,
child: Padding(
padding: const EdgeInsets.fromLTRB(8, 4, 8, 4),
child: Text(
'long text here',
textAlign: TextAlign.center,
),
),
),
),
],
),
),
You can use something like this to take the entire width of the Widget (make sure to be inside a MaterialApp and a Scaffold/Material child (home):
Wrap(
children: <Widget>[
Container(
color: Colors.red,
child: IntrinsicWidth(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
color: Colors.black,
height: 200,
child: Align(
alignment: Alignment.bottomRight,
child: Text(
"Hello World",
style: TextStyle(color: Colors.white),
),
),
),
Container(
color: Colors.blue,
height: 100,
child: Align(
alignment: Alignment.topRight,
child: Text(
"Bottom Text Longer Text",
style: TextStyle(color: Colors.white),
),
),
),
],
),
),
),
],
)
The Align is not necessary, is just to showcase how the width actually works with "double.infinity" and moving a text to the bottom right or top right portion of it.
I am unable to set the dynamic size to my list item of list view builder, every time it shows blank screen and when I specify a constant size it works.
I tried by using column by setting mainAxisSize=minimum and by using container as we know container wraps the child height but nothing works
listItem (GuideLines news) =>Column(
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: <Widget>[Container(
decoration: BoxDecoration(image: new DecorationImage(image: AdvancedNetworkImage(
"${news.featured_image}",
useDiskCache: true,
cacheRule: CacheRule(maxAge: const Duration(days: 7)),
),fit: BoxFit.cover)),
margin: EdgeInsets.only(bottom: 10.0),
child: ListTile(
onTap: (){
print(news.web_link);
Navigator.push(context, MaterialPageRoute(builder: (context) => NewsDetailsPage(news)));
},
title: new Container(
margin: EdgeInsets.only(left: 30.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 20.0),
child: new Text("${DateFormat("E, d MMM y").format(CommonService.dateFormat(news.publish_date.toString()))}", style: TextStyle(fontFamily: 'SF-Display-Regular' ,fontSize: 13.0 ,color: Colors.white),),
),
SizedBox(height: 13.0),
new Flexible(
child: new Container( width: MediaQuery.of(context).size.width *0.45,
child: Padding(
padding: const EdgeInsets.only(bottom: 20.0),
child: new Text("${news.title}" ,maxLines: 3, overflow: TextOverflow.ellipsis, style: TextStyle(fontFamily: 'SF-Display-Semibold' ,fontSize: 22.0 ,color: Colors.white),),
)
),
)
],
)),
trailing: Padding(
padding: const EdgeInsets.only(right: 20),
child: Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[Icon(Icons.arrow_forward_ios, color: Colors.white),SizedBox(width: 8,)],
),
),
),
)],
);
Just add these two properties of shrinkWrap and physics to make the height of list dynamic
ListView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(), //Optional
itemCount: size,
itemBuilder: (context, position) {}
),
The problem with your code is, that you used a Flexible widget in a Column. A Flexible widget expands to the remaining space of the Column or Row. However, this only works if you have restricted the size of the Column or Row widget. Because otherwise, the size of the element in the Column would expand to infinity as the remaining space is not restricted and therefore also infinity.
When using Flexible or Expanded widgets you always need to restrict their parent size, else you get this error:
RenderFlex children have non-zero flex but incoming height constraints
are unbounded. When a column is in a parent that does not provide a
finite height constraint, for example if it is in a vertical
scrollable, it will try to shrink-wrap its children along the vertical
axis. Setting a flex on a child (e.g. using Expanded) indicates that
the child is to expand to fill the remaining space in the vertical
direction.
The solution and some cleanup of your code:
Widget listItem(GuideLines news) {
return Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AdvancedNetworkImage(
"${news.featured_image}",
useDiskCache: true,
cacheRule: CacheRule(maxAge: const Duration(days: 7)),
),
fit: BoxFit.cover),
),
margin: EdgeInsets.only(bottom: 10.0),
child: ListTile(
onTap: () {
print(news.web_link);
Navigator.push(context, MaterialPageRoute(builder: (context) => NewsDetailsPage(news)));
},
title: Container(
margin: EdgeInsets.only(left: 30.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 20.0, bottom: 13.0),
child: Text(
"${DateFormat("E, d MMM y").format(CommonService.dateFormat(news.publish_date.toString()))}",
style: TextStyle(fontFamily: 'SF-Display-Regular', fontSize: 13.0, color: Colors.white),
),
),
Container(
width: MediaQuery.of(context).size.width * 0.45,
padding: const EdgeInsets.only(bottom: 20.0),
child: new Text(
"${news.title}",
maxLines: 3,
overflow: TextOverflow.ellipsis,
style: TextStyle(fontFamily: 'SF-Display-Semibold', fontSize: 22.0, color: Colors.white),
),
)
],
),
),
trailing: Padding(
padding: const EdgeInsets.only(right: 28),
child: Icon(Icons.arrow_forward_ios, color: Colors.white),
),
),
);
}
In your specific case, this Flexible widget was redundant anyway.
I need a Container with some text in to auto expand. I have an API call, which can be anything from 5 words to 500 words. I don't want to just have 1 fixed size that's huge, but contains 10 words.
I have tried Expanded() and SizedBox.Expand(), but I might be using them wrong
Card(
elevation: defaultTargetPlatform ==
TargetPlatform.android ? 5.0 : 0.0,
child: Column(
children: <Widget>[
Container(
margin: const EdgeInsets.all(0.0),
padding: const EdgeInsets.all(2.0),
decoration: BoxDecoration(color: Colors.black),
width: _screenSize.width,
height: 250,
child: Column(
children: <Widget>[
Container(
color: Colors.black,
width: _screenSize.width,
height: 35,
child: Padding(
padding: const EdgeInsets.only(
left: 15, top: 11),
child: Text("Title".toUpperCase(),
style: TextStyle(
color: Colors.white
),
),
),
),
Container(
color: Colors.white,
width: _screenSize.width,
height: 210,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 8, bottom: 5),
child: Text("Title of expanding text", style: TextStyle(
fontSize: 25,
),
),
),
Text("Expanding text", style: TextStyle(
fontSize: 35,
fontWeight: FontWeight.w800
),),
],
),
),
],
),
),
],
),
),
I just need the Container to expand, but stay small/get bigger
Have you tried not specifying height at all? The Container should wrap according to the child in this case.
Otherwise, the widget has a child but no height, no width, no
constraints, and no alignment, and the Container passes the
constraints from the parent to the child and sizes itself to match the
child.
Above is an extract from the official flutter documentation for Container.
Here is the official flutter documentation link.
You can use FittedBox, this will resize your text according to available area.
You can use it like this :
FittedBox(child: Text('...............Your text...............'));
I would suggest you to use Constraints...this will set Container height according to the Text child's requirement. Please see the example...
Container(
constraints: BoxConstraints(
maxHeight: double.infinity,
),
child: Column(
children: [
Text(
'Hello flutter...i like flutter...i like google...',
softWrap: true,
style: TextStyle(
color: Colors.white, fontSize: 20 , ),
),],),)
we just neeed to add mainAxisSize: MainAxisSize.min, properties inside child Column or Row where the child is set to Container
for example
AnythingYourWidget(
child: Container(
child: Column( // For Example Column
mainAxisSize: MainAxisSize.min, // these properties following the children content height available.
children: [
// YourWidget
]
)
)
),
I too had a container with a text widget inside that would not scale as the text increased in character count. Make the widget tree Container -> IntrinsicWidth -> Text/TextField and it seems to play nicely for me.
IntrinsicWidth will scale the size of the container to its child.