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InputDecorator appears not to expand for entire widget
I noticed that when you set TextField's input decoration border to OutlineInputBorder it does encompass it's full size.
TextField example: https://dartpad.dev/?id=9fdc5bbe62239c8912ced4d1677abe89
InputDecorator example: https://dartpad.dev/?id=4c1d9d0962bfaf77f57a519cafb3a1e8
Expected results:
I would expect the OutlineInputBorder to wrap the entire TextField.
Actual results:
The OutlineInputBorder just wraps the first line.
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Hey @NebulaFox. I can see the outline around the text field in your sample on Dartpad. But it doesn't seem to have a focus border. Is that the issue you're raising here?
Hey @exaby73 No. The problem is the TextField is filling the entire space on the screen, but the OutlineInputBorder doesn't. Here is a screenshot to demonstrate the problem.
Looking at the devtools, and your screenshot, the decorator seems to be covering the screen, which makes sense since it's in an Expanded widget. If you want the TextField to expand too, you can wrap the TextField in a SizedBox.expand
Thanks for your reply @exaby73.
It is good to see there is a working solution to have the InputDecorator be the same size as an expanded TextField, but it's a shame that it is not the TextField's internal InputDecorator.
Is the solution then to not use the internal TextField's InputDecorator but wrap the TextField with an InputDecorator and then expand the TextField?
Example: https://dartpad.dev/?id=7550d138a36a1693031d9c3534a4d053
The _Decorator in the screenshot is from the TextField's internal InputDecorator.
@NebulaFox Please correct me if I'm wrong or lacking some information here. I ran your first sample code and see the TextField's InputDecoration still be shown when the text is expanded:
Demo
| normal visual | inspecting devtool |
|---|---|
 |
 |
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@huycozy No, the TextField's InputDecoration isn't expanded when I run the the example. It is like my earlier screenshot.
The only difference I can see is yours includes text in the TextField while mine doesn't. I expected the TextField's InputDecorator to fill the expanded space, without text.
Hope that helps.
Ah, I see the issue now. Without filled text, TextField's InputDecoration should be expanded to its max height. My first thought is that this issue may be similar to #82709 (a duplicate of #108813) but it is not because of the different behavior.
Labeling this issue for further insights. I would like to summarise the issue as below:
Step to reproduce
- Run this sample code
Sample code
import 'package:flutter/material.dart';
void main() {
runApp(App());
}
class App extends StatelessWidget {
const App({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const HomePage(),
);
}
}
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
@override
State<HomePage> createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
@override
Widget build(BuildContext context) {
final theme = Theme.of(context);
return Scaffold(
appBar: AppBar(),
body: Padding(
padding: const EdgeInsets.only(left: 8, right: 8, bottom: 8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text("LABEL", style: theme.textTheme.bodySmall,),
SizedBox(height: 8.0,),
Expanded(
child: TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
),
maxLines: null,
keyboardType: TextInputType.multiline,
),
)
],
)
)
);
}
}
- The TextField's InputDecoration is not expanded even though it's inside an Expanded widget.
| Actual result | Expected result |
|---|---|
 |
 |
Workaround
https://github.com/flutter/flutter/issues/120633#issuecomment-1445124226
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How do we expect this to work with the expands parameter too? I think there might be some kind of conflict between the expands parameter and the Expanded widget, like what we expect to happen when expands is false but it's inside of Expanded, etc.
The fact that you can click below the border to focus the field does seem like a bug... I'm not sure exactly what the solution should look like in every case, though.
Here is the original PR where I introduced expanded, for the record: https://github.com/flutter/flutter/pull/27205.
