I made a navbar widget and a MaterialApp inside a Row widget and I want access MaterialApp routes from the navbar. the problem is Navbar context has no idea about MaterialApp Routes. Any idea how can I achieve this?!
Widget build(BuildContext context) {
return Row(
children: <Widget>[
Expanded(
child: NavBar(),
),
Expanded(
child: MaterialApp(
onGenerateRoute: routes,
),
),
],
);
}
Related
I am trying to set an image in the center of Column, and the Text at the bottom of the image, by wrapping Image and Text in the Column widget and placing it in the Center widget.
Unfortunately, it centers the Column and makes Image to be above the center of the screen.
How can I solve it?
My current code:
#override
Widget build(BuildContext context) {
return Container(
decoration: BoxDecoration(color: Theme.of(context).primaryColor),
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Image.asset(ImagePaths.newLogoLogin),
Text(Strings.beALocal)
],
),
),
);
}
This can be achieved using the Expanded widget:
#override
Widget build(BuildContext context) {
return Container(
decoration: BoxDecoration(color: Theme.of(context).primaryColor),
child: Column(
children: [
Spacer(),
Image.asset(ImagePaths.newLogoLogin),
Expanded(
Column(
children: [ Text(Strings.beALocal) ],
mainAxisAlignment: MainAxisAlignment.start
)
)
],
),
);
}
You could use a Stack with a Positioned Text widget inside it.
Full example:
void main() => runApp(App());
class App extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: Text("Test")),
body: Stack(children: [Placeholder(), Test()]),
),
);
}
}
class Test extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Center(
child: Stack(
alignment: AlignmentDirectional.bottomCenter,
overflow: Overflow.visible,
children: <Widget>[
Container(
width: 150,
height: 150,
color: Colors.blue,
),
Positioned(child: Text("Some text"), bottom: -25),
],
),
);
}
}
you can use widget SafaArea or calc size of the appbar and the navigation bar, when you have this result use this for remove in height size of screen after this you can add column MainAxisAlignment.center, CrossAxisAlignment.center and add other widget in Column
When I provide the SafeArea to a Widget, then it gets some margin from the notches and home button (horizontal line in iPhone X +). How can I change the background of the unsafe area ? (The margin portion)?
Wrap your SafeArea into a widget that adds a background:
Container(
color: Colors.red,
child: SafeArea(...),
),
Another way to do it.
import 'package:flutter/services.dart';
Scaffold(
body: AnnotatedRegion<SystemUiOverlayStyle>(
value: SystemUiOverlayStyle.light.copyWith(
statusBarColor: Theme.of(context).primaryColor
),
child: SafeArea(
child: Container(...),
),
),
)
Following on from Rémi Rousselet's answer...
In my case, I created a new widget called ColoredSafeArea:
import 'package:flutter/material.dart';
class ColoredSafeArea extends StatelessWidget {
final Widget child;
final Color? color;
const ColoredSafeArea({
Key? key,
required this.child,
this.color,
}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
color: color ?? Theme.of(context).appBarTheme.backgroundColor,
child: SafeArea(
child: Container(
color: Theme.of(context).colorScheme.background,
child: child,
),
),
);
}
}
And use this in place of SafeArea in my Scaffold. I have it set up to use the current AppBar colour from my theme, by default. But you can use whatever works for you, of course.
Basically, this widget will change the SafeArea colour without affecting your app background colour, due to the Container within, which takes the background colour from the current theme's colorScheme. The advantage of this is that the background colour will work with any dark or light themes you have set up.
This is probably the easiest way to accomplish this:
const Scaffold(
backgroundColor: Colors.white,
body: SafeArea(
child: Text(
"White scaffold background that also applies to status bar",
style: TextStyle(fontSize: 20),
),
),
);
Basically use SafeArea as a child of Scaffold and set the scaffold's background color to whatever you want or use ThemeData to set it globally using the scaffoldBackgroundColor prop
I have combined both the above answers to achieve
the system theme set (dark/light)
the color/gradient of unsafe area
The code I've used is
var brightness = SchedulerBinding.instance.window.platformBrightness;
bool isDarkModeOn = brightness == Brightness.dark;
Widget build(BuildContext context) {
return Scaffold(
body: AnnotatedRegion<SystemUiOverlayStyle>(
value: isDarkModeOn
? SystemUiOverlayStyle.dark.copyWith(
statusBarColor: Theme.of(context).primaryColor,
)
: SystemUiOverlayStyle.light.copyWith(
statusBarColor: Theme.of(context).primaryColor,
),
child: Container(
decoration: getScreenGradient(),
child: SafeArea(
child: Container(
child: Center(
child: Stack(
children: [
getBackgroundImage(),
getBody(),
],
),
),
),
),
),
),
);
}
I have a Stack widget as follows:
Widget build(BuildContext context) {
final title = StringsES.title_meter_list_screen;
_context = context;
return Scaffold(
appBar: appbar,
body: Stack(
children: <Widget>[
GridView.count(
padding: EdgeInsets.all(10.0),
primary: false,
crossAxisCount: 2,
children: _buildWidgetList(),
),
Align(
child: _progressBarWidget(),
),
],
)
);
}
And the _progressBarWidget is the following:
Widget _progressBarWidget() {
return (_isProgressBarVisible)
? CircularProgressIndicator(strokeWidth: 4.0, )
: Container();
}
In this way, the CircularProgressIndicator Widget is displayed behind the GridView, and I want it to appear in front of the GridView.
If I change my code and replace the CircularProgressIndicator with a simple text widget, it works correctly.
What am I doing wrong?
I can't figure it out how to make this background properly sized to the rest of the screen. Anyone could point me whats wrong ??
I kinda trying to make this fit the rest screen but can;t manage to do it...
class HomeScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Column(
children: <Widget>[
new GradientAppBar('Milkyway Galaxy'),
new Container(
child: new Stack(
children: <Widget>[
_buildBackground(),
_buildDescription(),
],
),
),
],
);
}
Widget _buildBackground() {
return new Container(
// constraints: new BoxConstraints.expand(),
child: new Image.asset('assets/images/milkyway.gif', fit: BoxFit.cover,),
);
}
Widget _buildDescription() {
return new Container(
child: new Center(
child: new Text(milkyWayGalaxy.description),
),
);
}
}
Use BoxDecoration to apply your image as a background image of your Container. Use the Expanded widget to make sure that the Container fills the remaining space of the screen:
class HomeScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Column(
children: <Widget>[
new GradientAppBar('Milkyway Galaxy'),
new Expanded(
child: new Container(
decoration: new BoxDecoration(
image: new DecorationImage(
image: new AssetImage('assets/images/milkyway.gif'),
fit: BoxFit.cover,
),
),
child: new Center(
child: new Text(milkyWayGalaxy.description),
),
),
),
],
);
}
}
If the text is longer, you may want to wrap it in a SingleChildScrollView.
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