'TextField inside of Row causes layout exception: Unable to calculate size
I’m getting a rendering exception that I don’t understand how to fix. I’m attempting to create a column that has 3 rows.
Row [Image]
Row [TextField ]
Row [Buttons]
Here is my code to build the container:
Container buildEnterAppContainer(BuildContext context) {
var container = new Container(
padding: const EdgeInsets.all(8.0),
child: new Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
buildImageRow(context),
buildAppEntryRow(context),
buildButtonRow(context)
],
),
);
return container;
}
and my buildAppEntryRow code for the text container
Widget buildAppEntryRow(BuildContext context) {
return new Row(
children: <Widget>[
new TextField(
decoration: const InputDecoration(helperText: "Enter App ID"),
style: Theme.of(context).textTheme.body1,
)
],
);
}
When I run I get the following exception:
I/flutter ( 7674): BoxConstraints forces an infinite width.
I/flutter ( 7674): These invalid constraints were provided to RenderStack's layout() function by the following
I/flutter ( 7674): function, which probably computed the invalid constraints in question:
I/flutter ( 7674): RenderConstrainedBox.performLayout (package:flutter/src/rendering/proxy_box.dart:256:13)
I/flutter ( 7674): The offending constraints were:
I/flutter ( 7674): BoxConstraints(w=Infinity, 0.0<=h<=Infinity)
If i change buildAppEntryRow to just a TextField instead like this
Widget buildAppEntryRow2(BuildContext context) {
return new TextField(
decoration: const InputDecoration(helperText: "Enter App ID"),
style: Theme.of(context).textTheme.body1,
);
}
I no longer get the exception. What am I missing with the Row implementation that is causing it to not be able to calculate the size of that row?
Solution 1:[1]
(I assume you're using a Row
because you want to put other widgets beside the TextField
in the future.)
The Row
widget wants to determine the intrinsic size of its non-flexible children so it knows how much space that it has left for the flexible ones. However, TextField
doesn't have an intrinsic width; it only knows how to size itself to the full width of its parent container. Try wrapping it in a Flexible
or Expanded
to tell the Row
that you're expecting the TextField
to take up the remaining space:
new Row(
children: <Widget>[
new Flexible(
child: new TextField(
decoration: const InputDecoration(helperText: "Enter App ID"),
style: Theme.of(context).textTheme.body1,
),
),
],
),
Solution 2:[2]
You get this error because TextField
expands in horizontal direction and so does the Row
, so we need to constrain the width of the TextField
, there are many ways of doing it.
Use
Expanded
Row( children: <Widget>[ Expanded(child: TextField()), OtherWidget(), ], )
Use
Flexible
Row( children: <Widget>[ Flexible(child: TextField()), OtherWidget(), ], )
Wrap it in
Container
orSizedBox
and providewidth
Row( children: <Widget>[ SizedBox(width: 100, child: TextField()), OtherWidget(), ], )
Solution 3:[3]
you should use Flexible to use a Textfield inside a row.
new Row(
children: <Widget>[
new Text("hi there"),
new Container(
child:new Flexible(
child: new TextField( ),
),//flexible
),//container
],//widget
),//row
Solution 4:[4]
As @Asif Shiraz mentioned I had same issue and solved this by Wrapping Column in a Flexible, here like this,,
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new Scaffold(
body: Row(
children: <Widget>[
Flexible(
child: Column(
children: <Widget>[
Container(
child: TextField(),
)
//container
],
))
],
mainAxisAlignment: MainAxisAlignment.spaceBetween,
),
));
}
}
Solution 5:[5]
The solution is to wrap your Text()
inside one of the following widgets:
Either Expanded
or Flexible
. So, your code using Expanded will be like:
Expanded(
child: TextField(
decoration: InputDecoration(
hintText: "Demo Text",
hintStyle: TextStyle(fontWeight: FontWeight.w300, color: Colors.red)
),
),
),
Solution 6:[6]
Row(
children: [
Expanded(
flex: 1,
child: Padding(
padding: EdgeInsets.only(left: 5.0,right: 5.0),
child: TextFormField(
controller: commentController,
validator: (String value){
if(value.isEmpty){
// ignore: missing_return
return 'Comment cannot be blank.';
}
},
decoration: InputDecoration(
labelText: "Comment",
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.green))),
),
),
),
],
),
Solution 7:[7]
The InputDecoration
of a TextField
can cause an infinite width problem when placed inside a Row
. Flutter explains this in the InputDecoration
constraints property documentation:
Typically the decorator will fill the horizontal space it is given. ... If null, then the ambient
ThemeData.inputDecorationTheme
'sInputDecorationTheme.constraints
will be used. If that is null then the decorator will fill the available width with a default height based on text size.
So, the good news is that the width of a TextField
can be constrained without the use of surrounding widgets like Expanded
. Simply provide an instance of BoxConstraints
to the constraints
parameter of the InputDecoration
that the TextField
widget uses:
const TextField(
decoration: InputDecoration(
constraints: BoxConstraints.tightFor(
width: 200,
),
),
)
As mentioned in the Flutter documentation above, a set of constraints can be applied to several widgets at once by using a Theme
with a ThemeData
that specifies an InputDecorationTheme
with the desired constraints for descendent widgets of the Theme
to inherit from and use.
Solution 8:[8]
I had the same problem.
If you want, you can use Table widget to avoid this kind of issue with TextField
Solution 9:[9]
A simple solution is to wrap your Text()
inside a Container()
.
So, your code will be like:
Container(
child: TextField()
)
Here you also get the width and height attribute of a container to adjust the look and feel of your text field. No need to use Flexible
if you are wrapping your text field inside of a Container.
Solution 10:[10]
If you want your TextField to size itself horizontally based on its content then you can wrap it with IntrinsicWidth widget.
Row(
children: [
Text("From"),
SizedBox(width: 10,),
IntrinsicWidth(child: TextField(
textAlignVertical: TextAlignVertical.center,
decoration: InputDecoration(
hintText: "Start Date Start Date Start Date",
hintStyle: TextStyle(color: Colour.pBlue, fontSize: 14),
border: InputBorder.none,
),
),),
SizedBox(width: 10,),
Text("To"),
SizedBox(width: 10,),
IntrinsicWidth(child: IntrinsicWidth(child: TextField(
textAlignVertical: TextAlignVertical.center,
decoration: InputDecoration(
hintText: "End Date",
hintStyle: TextStyle(color: Colour.pBlue, fontSize: 14),
border: InputBorder.none,
),
),)),
],
)
But before using it in your code make sure to know what Flutter says about this widget.
Creates a widget that sizes its child to the child's intrinsic width. This class is relatively expensive. Avoid using it where possible.
Solution 11:[11]
the best solution is with absouluts space values
Row(
children: <Widget>[
SizedBox(
width: MediaQuery.of(context).size.width * 0.3,
child: _telephonePrefixInput()
),
SizedBox(width: MediaQuery.of(context).size.width * 0.02),
Expanded(child: _telephoneInput()),
],
),
Sources
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Source: Stack Overflow