Issue in PreferredSize required
this is my code:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('flutter'),
leading: IconButton(
icon: Icon(Icons.menu),
onPressed: () {
},
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.search),
onPressed: () {
},
),
IconButton(
icon: Icon(Icons.more_vert),
onPressed: () {
},
)
],
flexibleSpace: SafeArea(
child: Icon(
Icons.photo_camera,
size: 75.0,
color: Colors.white70
),
),
),
bottomSheet: (
PreferredSize(
child: Container(
color: Colors.blue,
height: 50.0,
child: Center(
child: Text('Mybutton')
)
),
)
),
body: null,
)
);
}
}
PreferredSize widget need a PreferredSize so you should declare that. It can be fromWidth, fromHeight or fromRadius, I assume you need height for your case, so check below code and write your preferred height value instead of 50.
PreferredSize(
preferredSize: Size.fromHeight(50),
child: Container(
Related
I want to implement navigation drawer in flutter like this screenshot. But don't know how.
Please give me some code hint.
Thank you.
This is the image I like to archive
use the Drawer Widget in scaffold
this is an example from the official documentation
Scaffold(
appBar: AppBar(
title: const Text('Drawer Demo'),
),
drawer: Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: const <Widget>[
DrawerHeader(
decoration: BoxDecoration(
color: Colors.blue,
),
child: Text(
'Drawer Header',
style: TextStyle(
color: Colors.white,
fontSize: 24,
),
),
),
ListTile(
leading: Icon(Icons.message),
title: Text('Messages'),
),
ListTile(
leading: Icon(Icons.account_circle),
title: Text('Profile'),
),
ListTile(
leading: Icon(Icons.settings),
title: Text('Settings'),
),
],
),
),
);
this is the result =>
You have to use the Drawer widget.
Scaffold(
drawer: Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: [
ListTile(
title: const Text('Item 1'),
onTap: (){
// do something
},
),
ListTile(
title: const Text('Item 2'),
onTap: (){
// do something
},
),
],
),
),
...
And that's pretty much it! Learn more about Drawer, here.
An easy to archive this is using another Scaffold on body and using drawer there. And to control the drawer use ScaffoldState GlobalKey.
Result
Widget
class _MyApp extends StatefulWidget {
#override
State<_MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<_MyApp> {
static final GlobalKey<ScaffoldState> _key = GlobalKey();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: IconButton(
onPressed: () {
if (_key.currentState != null) {
if (_key.currentState!.isDrawerOpen) {
Navigator.pop(_key.currentContext!);
} else {
_key.currentState!.openDrawer();
}
}
},
icon: const Icon(
Icons.more,
),
),
),
body: Scaffold(
key: _key,
drawer: Drawer(
child: Container(
color: Colors.red,
),
),
body: Column(
children: const [
Text("Child"),
],
),
));
}
}
This time I'm making an app top bar in flutter. I wrote code like this.
import 'package:flutter/material.dart';
class VideoAppBar extends StatelessWidget{
const VideoAppBar({Key? key}) : super(key: key);
#override
Widget build(BuildContext context){
return SafeArea(
child: Scaffold(
body: WillPopScope( // <- wraps only the Scaffold body.
child: Center(
),
onWillPop: () {
return Future(() => false);
},
),
appBar: AppBar(
backgroundColor: Colors.white,
title: Text('Very verse',
style: TextStyle(
color: Colors.black,
fontSize: 20,
),),
centerTitle: true,
leading: IconButton(
onPressed: () {
Navigator.pop(context);
},
color: Colors.black,
iconSize: 25,
icon: Icon(Icons.arrow_back),
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.bookmark_outline),
iconSize: 25,
color: Colors.black,
onPressed: () {
print('GD');
}
),
],
),
),
);
}
}
I'd like to put this code simply as a function on several other pages.
AppBar(title:VideoAppBar);
I figured it could be done like this.
But it doesn't go back.
How should I write the code?
Try below Code hope its helpful to you
Create your regular class or your Widget like below:
import 'package:flutter/material.dart';
void main() {
runApp(
MyApp(),
);
}
class MyApp extends StatelessWidget {
bool shouldPop = true;
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: WillPopScope(
onWillPop: () async {
return shouldPop;
},
child: Scaffold(
appBar: appBar(context),
body: Center(
child: Text('Test'),
),
),
),
);
}
}
Create another dart file like appBar.dart and declare your Appbar Widget in dart file. call your widget any file on your need
appBar(BuildContext context) {
return AppBar(
backgroundColor: Colors.white,
title: Text(
'Very verse',
style: TextStyle(
color: Colors.black,
fontSize: 20,
),
),
centerTitle: true,
leading: IconButton(
onPressed: () {
Navigator.pop(context);
},
color: Colors.black,
iconSize: 25,
icon: Icon(Icons.arrow_back),
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.bookmark_outline),
iconSize: 25,
color: Colors.black,
onPressed: () {
print('GD');
}),
],
);
}
For WillPopScope class
For Scaffold class
For AppBar
Your result screen ->
How to create a button that has text and an icon by using the latest button widget ElevatedButton.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Elevated Button',
home: FlutterExample(),
);
}
}
class FlutterExample extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Elevated Button with Icon and Text')),
body: Center(
child: ElevatedButton.icon(
icon: Icon(
Icons.home,
color: Colors.green,
size: 30.0,
),
label: Text('Elevated Button'),
onPressed: () {
print('Button Pressed');
},
style: ElevatedButton.styleFrom(
shape: new RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(20.0),
),
),
)));
}
}
you can add Row() or Wrap() Widget with multiple children in this case Icon() and Text()
ElevatedButton(
onPressed:() {},
child: Wrap(
children: <Widget>[
Icon(
Icons.favorite,
color: Colors.pink,
size: 24.0,
),
SizedBox(
width:10,
),
Text("Click me!", style:TextStyle(fontSize:20)),
],
),
),
You can use ElevatedButton.icon constructor:
ElevatedButton.icon(
onPressed: () {
//OnPressed Logic
},
icon: const Icon(Icons.plus_one),
label: const Text(
"Button Text"
)
),
You can use ElevatedButton.icon constructor for this like
ElevatedButton.icon(
icon: const Icon(Icons.add, size: 18),
label: Text('My elevated button'),
onPressed: () {},
),
I'm trying to change the icon and color of my drawer widget in Dart. I've found ways of doing it but none that apply to my scenario. My custom drawer widget is being returned from another class and so I can't change the leading icon in the home class where the app bar is or it will replace my current drawer. I won't show all the code because I don't believe it would be necessary. Any help would be appreciated.
My Current drawer and method of calling it:
Drawer class:
import 'package:flutter/material.dart';
import 'package:new_app/Users.dart';
import '../main.dart';
class MainDrawer extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Drawer(
child: Column(
children: <Widget>[
Container(
width: double.infinity,
padding: EdgeInsets.all(20),
color: Theme.of(context).primaryColor,
child: Center(
child: Column(
children: [
Container(
Menu Class/ home page:
import 'screens/drawer_main.dart';
class Home extends StatefulWidget {
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
#override
Widget build(BuildContext context) {
return WillPopScope(
onWillPop: () {
return new Future(() => false);
},
child: Scaffold(
backgroundColor: Colors.blueGrey[900],
appBar: AppBar(
//backgroundColor: Colors.blueGrey[900],
backgroundColor: Colors.transparent,
automaticallyImplyLeading: true,
title: Text(
"Home Page",
style: TextStyle(color: Colors.white),
),
actions: <Widget>[
//Profile Pic
IconButton(
icon: Icon(Icons.circle, color: Colors.white),
tooltip: 'Comment Icon',
onPressed: () {},
),
MainPopUp(), //IconButton
],
//IconButton
brightness: Brightness.dark,
),
//Current Method of Calling the Drawer:
drawer: MainDrawer(),
body: Center(
Add the leading property in the App Bar and then call the Drawer Widget Programmatically.
Scaffold(
backgroundColor: Colors.blueGrey[900],
appBar: AppBar(
//backgroundColor: Colors.blueGrey[900],
leading: Builder(
builder: (context) => IconButton(
icon: Icon(Icons.menu_rounded),
onPressed: () => Scaffold.of(context).openDrawer(),
),
),
backgroundColor: Colors.transparent,
automaticallyImplyLeading: true,
title: Text(
"Home Page",
style: TextStyle(color: Colors.white),
),
actions: <Widget>[
//Profile Pic
IconButton(
icon: Icon(Icons.circle, color: Colors.white),
tooltip: 'Comment Icon',
onPressed: () {},
),
MainPopUp(), //IconButton
],
//IconButton
brightness: Brightness.dark,
),
//Current Method of Calling the Drawer:
drawer: MainDrawer(),
Add a leading inside AppBar() and open drawer programatically.
AppBar(
leading: InkWell(
child: Icon(
//your preferred icon
Icons.camera
),
onTap: () {
Scaffold.of(context).openDrawer();
},
),
)
I want my app to have 2 appBars but i don't know how i can add the second one , The first one have this code :
appBar:
AppBar(
title: Text('Tariffo',
style: TextStyle(
color: Colors.white,
fontFamily: 'SignPainter',
fontSize: 45)),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.vertical(
bottom: Radius.circular(30),
),
),
actions: <Widget>[
Padding(
padding: EdgeInsets.only(right: 10),
),
IconButton(
icon: Icon(Icons.center_focus_weak),
onPressed: () async {
String scaning = await BarcodeScanner.scan();
setState(() {
qrResult = scaning;
});
},
),
IconButton(
icon: Icon(
Icons.perm_identity,
color: Colors.white,
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => UserPage()),
);
}),
And the second one have this code:
appBar: AppBar(title: const Text('Bottom App Bar')),
floatingActionButtonLocation:
FloatingActionButtonLocation.centerDocked,
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.add), onPressed: () {},),
bottomNavigationBar: BottomAppBar(
shape: CircularNotchedRectangle(),
notchMargin: 4.0,
child: new Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
IconButton(icon: Icon(Icons.menu), onPressed: () {},),
IconButton(icon: Icon(Icons.search), onPressed: () {},),
],
),
),
);
}
So how can i add the second one to not get an error? Beacuse i tried to erase the first part with appbar: Appbar and i get a lot o errors
Edit:
As Derek pointed out you should not place two Scaffolds in your App.
A different solution could be to place the first AppBar as usual in the appBar property of your Scaffold and the second as a first children in a Column.
This would look like:
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
backgroundColor: Colors.blue,
title: Text("First appbar"),
),
body: Column(
children: [
AppBar(
backgroundColor: Colors.red,
title: Text("Second appbar"),
),
HomePage()
],
),
),
);
}
}
class HomePage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Container(
color: Colors.yellow,
child: Text("Content"),
);
}
}
---------------------------
Old Answer:
Actually this is really simple.
You create your Scaffold in which you put the first AppBar as usual.
As the body of this Scaffold you put a second Scaffold in which you place your second AppBar.
The result would look like:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
backgroundColor: Colors.blue,
title: Text("First appbar"),
),
body: Scaffold(
appBar: AppBar(
backgroundColor: Colors.red,
title: Text("Second appbar"),
),
),
),
);
}
}