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I am trying to create a custom widget that is a rounded rectangle containing 3 iconButtons, used for navigation. but, as far as I have seen, iconButtons cannot be used outside of material widgets, and i don't know how to wrap them in a widget that doesn't mess up my UI.
just a container with iconButtons throws "no material widget found, iconButton widgets require material widget"
trying to wrap with a material widget, i get positional arguments, messing up my UI
i have tried wrapping my container in other widgets to no avail.
here is a piece of my code, just one of the icons in the container. the code repeats twice with different icon and onPressed before closing the widget.
i really would like my UI to look how i planned, and for these buttons to work.
#override
Widget build(BuildContext context) {
return Container(
height: 50.0,
width: 200.0,
// color: Colors.grey[800],
decoration: new BoxDecoration(
color: Colors.grey[800],
borderRadius: new BorderRadius.all( Radius.circular(50.0)),
),
child: Stack(
children: <Widget>[
Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new Container(
child: Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
IconButton(
icon: Icon(Icons.menu),
color: Colors.white,
onPressed: () {
print('test');
},
) // IconButton
], // <Widget>[]
) //Column
), // Container
Wrap your code in Scaffold and it will work.
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Container(
height: 50.0,
width: 200.0,
decoration: BoxDecoration(
color: Colors.grey[800],
borderRadius: new BorderRadius.all(Radius.circular(50.0)),
),
child: Stack(
children: [
Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
child: Column(
mainAxisSize: MainAxisSize.max,
children: [
IconButton(
icon: Icon(Icons.menu),
color: Colors.white,
onPressed: () {
print('test');
},
)
],
),
)
],
),
)
],
),
),
); // IconButton ], // [] ) //Column ), // Container
}
I am trying to expand widget inside of Column widget but not able to make it expended.
When giving constant height to parent widget, the layout will be rendered as expected. But as I remove the constant height layout is not as expected as I want to make Listview with it and I should not give a constant height to the widget which will be used as listview item.
Below is my layout code.
import 'package:flutter/material.dart';
void main() {
runApp(MaterialApp(
title: 'layout test',
home: Layout_test_class(),
));
}
class Layout_test_class extends StatelessWidget {
Widget cell() {
return Container(
color: Colors.yellow,
// height: 200, after un commenting this will work. but i want to make it without this
child: Row(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Expanded(
child: Column(
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Expanded(
child: Container(
color: Colors.green,
child: Text('apple z'),
),
),
Container(
color: Colors.red,
child:Text('apple 2'),
)
],
),
),
Column(
children: <Widget>[
Container(
color: Colors.black,
width: 200,
height: 200,
),
],
),
],
),
);
}
#override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
appBar: AppBar(
title: Text('title'),
),
body: Center(
child: ListView(
children: <Widget>[
cell(),
],
)
),
);
}
}
Below is my expected output screenshot.
Try to wrap your Container with IntrinsicHeight
return IntrinsicHeight(
Container(
color: Colors.yellow
child: ...
)
)
Your ListView needs to be inside Flexible. Flexible inside Column will set maximum height available to ListView. ListView needs a finite height from parent, Flexible will provide that based on max. space available.
Column(
children: <Widget>[
Flexible(
child: ListView.builder(...)
),
Container(
color: Colors.red,
child:Text('apple 2'),
),
],
)
A nice way of doing this, it's to play with the MediaQuery, heigth and width.
Let me explain, if you want the widget to have the maximum heigth of a decide screen, you can set it like this:
Container(
height: MediaQuery.of(context).size.height // Full screen size
)
You can manipulate it by dividing by 2, 3, 400, the value you want.
The same things works for the width
Container(
width: MediaQuery.of(context).size.width // Can divide by any value you want here
)
Actually quite the opposite, if you're planning to use this as an item in a listViewyou can't let infinite size on the same axis your listView is scrolling.
Let me explain:
Currently you're not defining any height on your cell() widget, which is fine if you're using it alone. like this :
import 'package:flutter/material.dart';
void main() {
runApp(MaterialApp(
title: 'layout test',
home: Layout_test_class(),
));
}
class Layout_test_class extends StatelessWidget {
Widget cell() {
return Container(
color: Colors.yellow,
//height: 250, after un commenting this will work. but i want to make it without this
child: Row(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Expanded(
child: Column(
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Expanded(
child: Container(
color: Colors.green,
child: Text('apple z'),
),
),
Container(
color: Colors.red,
child: Text('apple 2'),
)
],
),
),
Column(
children: <Widget>[
Container(
color: Colors.black,
width: 200,
height: 200,
),
],
),
],
),
);
}
#override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
appBar: AppBar(
title: Text('title'),
),
body: cell(),
);
}
}
But using it with a listView you have to define a height. A listView scrolls as long as it have some content to scroll. Right now it just like you're giving it infinite content so it would scroll indefinitely. Instead Flutter is not constructing it.
It's actually quite ok to define a global size for your container (as an item). You can even define a specific size for each using a parameter like this :
import 'package:flutter/material.dart';
void main() {
runApp(MaterialApp(
title: 'layout test',
home: Layout_test_class(),
));
}
class Layout_test_class extends StatelessWidget {
Widget cell(double height) {
return Container(
color: Colors.yellow,
height: height, //after un commenting this will work. but i want to make it without this
child: Row(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Expanded(
child: Column(
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Expanded(
child: Container(
color: Colors.green,
child: Text('apple z'),
),
),
Container(
color: Colors.red,
child: Text('apple 2'),
)
],
),
),
Column(
children: <Widget>[
Container(
color: Colors.black,
width: 200,
height: 200,
),
],
),
],
),
);
}
#override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
appBar: AppBar(
title: Text('title'),
),
body: ListView(
children: <Widget>[
cell(250.0),
cell(230.0),
cell(300.0),
],
)
);
}
}
I'm trying to build a layout where there are two Text objects at the top and bottom which stays stationery and a ListView at their center.
Here's the code for the Screen
class HomeScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Container(
padding: EdgeInsets.symmetric(horizontal: 40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Container(
margin: EdgeInsets.symmetric(vertical: 40.0),
child: Text(
DateFormat("hh:mm 'PM ,' MMMM d").format(DateTime.now()),
style: Theme.of(context).textTheme.title,
),
),
Expanded(
child: ListView.builder(
itemCount: 4,
itemBuilder: (BuildContext context, int index) =>
CustomAppText(
text: 'Custom App',
),
),
),
Container(
margin: EdgeInsets.symmetric(vertical: 40.0),
child: Text(
"Settings",
style: Theme.of(context).textTheme.title,
),
),
],
),
),
),
);
}
}
The output of the given code
The Design I'm looking for
I have tried using the Center widget but it does not center the ListView
The ListView fills the entire Expanded Widget, that's why using the Center widget didn't work, so shrinkWrap: true should be added so the ListView takes only the height of it's children.
After skimming through the documentation I found about Flexible Widget
Flexible, which does not force the child to fill the available space.
Made the change and works like a charm
Flexible(
child: ListView.builder(
shrinkWrap: true,
itemCount: 4,
itemBuilder: (BuildContext context, int index) =>
CustomAppText(
text: 'Custom App',
),
),
),
For those still looking for an answer, this is what worked for me:
Column(
children: [
Container(), // some top content
Expanded(
child: Center(
child: ListView(
shrinkWrap: true,
children: [] //your list view content here
)
)
),
Container(), // some bottom content
]
)
The Expanded widget makes the content take up all available space.
The Center widget centers the content you want to display.
The ListView holds your list content and the "shrinkWrap: true" property makes your list view shrink according to content size(allowing it to centralized by the Center widget when it's not taking a lot of space).
Hope it helps. Give the top and bottom widgets the 25% of the screen size. Give the listview the 50% of the screen size.
import 'package:flutter/material.dart';
class TestPage extends StatefulWidget {
#override
_TestPageState createState() => _TestPageState();
}
class _TestPageState extends State<TestPage> {
#override
Widget build(BuildContext context) {
final _size = MediaQuery.of(context).size;
return Scaffold(
body: SafeArea(
child: Padding(
padding: const EdgeInsets.all(28.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
// Top Widgets
Container(
width: double.infinity,
// color: Colors.green,
height: _size.height * 0.25, // Take 25% width of the screen height
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text('11: 25 AM', style: TextStyle(fontSize: 23.0),),
Text('Set As Launcher', style: TextStyle(fontSize: 23.0),)
],
),
),
Expanded(
child: Container(
// color: Colors.yellow,
child: ListView(
children: List.generate(25, (index){
return Text('Custom App $index', style: TextStyle(fontSize: 45.0),);
}),
),
),
),
// Bottom Widgets
Container(
width: double.infinity,
// color: Colors.blue,
height: _size.height * 0.25, // Take 25% width of the screen height
child: Column(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text('Settings', style: TextStyle(fontSize: 23.0),),
],
),
)
],
),
),
),
);
}
}
Just add an Expanded as a wrapper for your first Container inside the Column
Expanded(
child: Container(
margin: EdgeInsets.symmetric(vertical: 40.0),
child: Text(
DateFormat("hh:mm 'PM ,' MMMM d").format(DateTime.now()),
style: Theme.of(context).textTheme.title,
),
),
),
Just wrap your ListView.builder inside a container class and give it a height, either explicitly in double or as a percentage of screen height.
class Trial extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Container(
padding: EdgeInsets.symmetric(horizontal: 40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Container(
margin: EdgeInsets.symmetric(vertical: 40.0),
child: Text(
"Some Text",
style: Theme.of(context).textTheme.title,
),
),
Container(
// height: 40,
height: MediaQuery.of(context).size.height * 0.4,
child: ListView.builder(
itemCount: 20,
itemBuilder: (BuildContext context, int index) {
return Text("Hello");
}
),
),
Container(
margin: EdgeInsets.symmetric(vertical: 40.0),
child: Text(
"Settings",
style: Theme.of(context).textTheme.title,
),
),
],
),
),
),
);
}
}
Add two spacer it will give you 100% same result as you expected
Spacer(),
Expanded(
child: ListView.builder(
itemCount: 4,
itemBuilder: (BuildContext context, int index) =>
CustomAppText(
text: 'Custom App',
),
),
),
Spacer(),
It have to use shrinkWrap: true and Flexible together to show
all items of ListView.
Flexible(
child: ListView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
scrollDirection: Axis.vertical,
itemCount: models.length,
If you replace your Expanded widget with a Container and give that a fixed height, I think you get what you are looking for.
In my MaterialApp I have a Column inside a horizontal ListView.
Inside that Column is a Text widget.
ListView(
children: [
Column(
children: [
Text('this is the text widget'),
// here I have another widget placed, just imagine a rectangle
],
],)
textAlign: TextAlign.center, nor surrounding it with a Center will change the position of the Text. The Text will always stay in the top left corner.
Also, I saw a lot about axis alignments in answers regarding similar problems, but I tried every axis settings I saw without success.
As you can see the text in the upper image is not centered.
You need crossAxisAlignment: CrossAxisAlignment.center
ListView(
children: [
Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Text('this is the text widget'),
// here I have another widget placed, just imagine a rectangle
],
),
],
)
EDIT:
Since, you are unsatisfied with above answer. I re-did what you exactly want. Please refer below code:
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'MediaQuery Demo',
theme: new ThemeData(
primarySwatch: Colors.red,
),
home: new MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
Widget widgetToRepeat() {
return new Column(
children: <Widget>[
new Text('Hello'),
new Container(
width: 100.0,
height: 150.0,
color: Colors.green,
margin: new EdgeInsets.all(8.0),
)
],
);
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Demo'),
),
body: new Column(
children: <Widget>[
new Container(
child: new ListView(
scrollDirection: Axis.horizontal,
children: <Widget>[
widgetToRepeat(),
widgetToRepeat(),
widgetToRepeat(),
widgetToRepeat(),
widgetToRepeat(),
],
),
height: 150.0 + 16.0 + 20.0 + 16.0,
padding: new EdgeInsets.all(10.0),
)
],
),
);
}
}
I hope this helps. I am able to achieve text at horizontally center.
return new ListView(children: [
new Center(
child: Column(
children: [
Text('this is the text widget'),
// here I have another widget placed, just imagine a rectangle
],
),
)
]);
warp with new Center Widget
I'm trying to build a generic home page and I want to align the last child of my column (which contains all the widgets for the page) to the bottom of the screen but the widget wrapped in the Align is not moving. The following is what makes the most sense to me:
Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
ChildA(),
ChildB(),
Align(
alignment: Alignment.bottomCenter,
child: BottomAlignedChild()
)
]
)
What am I doing wrong?
You can use Expanded to make the last widget expand to the whole remaining space.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'My Layout',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Align Bottom Demo"),
),
body: new Column(children: <Widget>[
new Text("Text 1"),
new Text("Text 2"),
new Expanded(
child: new Align(
alignment: Alignment.bottomCenter,
child: new Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Icon(Icons.star),
new Text("Bottom Text")
],
)))
]),
);
}
}
Here is the result
Another approach is using Spacer():
...
Column(children: [Text1, Text2, Spacer(), YourBottomWidget()]),
...
I have always used Spacer for these kind of cases in Column or Row. Spacer takes up all the available space between two widgets of Row/Column.
For given example, you can try following
Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
ChildA(),
ChildB(),
Spacer(),
BottomAlignedChild()
]
)
There are multiple ways of doing it.
Use Spacer:
Column(
children: <Widget>[
TopContainer(),
Spacer(), // <-- Spacer
BottomContainer(),
],
)
Use mainAxisAlignment:
Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween, // <-- spaceBetween
children: <Widget>[
TopContainer(),
BottomContainer(),
],
)
Combine Expanded and Align:
Column(
children: <Widget>[
TopContainer(),
Expanded(
child: Align(
alignment: Alignment.bottomCenter,
child: BottomContainer(),
),
),
],
)
Screenshot (same for all)
If you are flexible to change column to a stack, you can do the following.
body: Container(
child: Stack(children: <Widget>[
Text('Text 1'),
Text('Text 2'),
Align(
alignment: Alignment.bottomCenter,
child: Text(
"Text in bottom",
),
),
]),
),
You can try wrapping the widgets which needs to be at the top inside another Column widget, thereby making the root widget containing only two children. 1st child containing all the widgets which need to be aligned at the top and the 2nd child containing widget which is to be placed at the bottom. Now you use mainAxisAlignment: MainAxisAlignment.spaceBetween to align 1st child to the top and second to the bottom.
Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Column(
children: <Widget>[
ChildA(),
ChildB(),
]
),
BottomAlignedChild(),
]
);