This is what I am trying to achieve:
I've thought about onHover in MouseRegion widget and trying to see if this code works in body part.
I was going to implement this in AppBar in scaffold after i see this works in body part but i couldn't.
Does anyone know correct way?
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
static const String _title = 'Flutter Code Sample';
#override
Widget build(BuildContext context) {
return MaterialApp(
title: _title,
home: Scaffold(
appBar: AppBar(title: const Text(_title)),
body: Center(
child: MyStatefulWidget(),
),
),
);
}
}
class MyStatefulWidget extends StatefulWidget {
MyStatefulWidget({Key key}) : super(key: key);
#override
_MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
showMenus(BuildContext context) async {
await showMenu(
context: context,
position: RelativeRect.fromLTRB(100, 100, 100, 100),
items: [
PopupMenuItem(
child: Text("View"),
),
PopupMenuItem(
child: Text("Edit"),
),
PopupMenuItem(
child: Text("Delete"),
),
],
);
}
#override
Widget build(BuildContext context) {
return ConstrainedBox(
constraints: BoxConstraints.tight(Size(300.0, 200.0)),
child: MouseRegion(
onHover: showMenus(context),
child: Container(
color: Colors.lightBlueAccent,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('You have entered or exited this box this many times:'),
],
),
),
),
);
}
}
Your only problem is incorrectly invoking the method.
On your MouseRegion onHover it should have a () => before invoking the method:
// the onHover event gives you an event object
onHover: (event) => showMenus(context),
Related
Like this half screen
How can I achieve it in flutter? Please guide me in making this
many thanks for considering my request.
These are called bottom sheets. Please try the code below.
Bottom Sheet
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
static const String _title = 'Flutter Code Sample';
#override
Widget build(BuildContext context) {
return MaterialApp(
title: _title,
home: Scaffold(
appBar: AppBar(title: const Text(_title)),
body: const MyStatelessWidget(),
),
);
}
}
class MyStatelessWidget extends StatelessWidget {
const MyStatelessWidget({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Center(
child: ElevatedButton(
child: const Text('showModalBottomSheet'),
onPressed: () {
showModalBottomSheet<void>(
context: context,
builder: (BuildContext context) {
return Container(
height: 200,
color: Colors.amber,
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
const Text('Modal BottomSheet'),
ElevatedButton(
child: const Text('Close BottomSheet'),
onPressed: () => Navigator.pop(context),
)
],
),
),
);
},
);
},
),
);
}
}
In the application, the home page is ResultScreen, which displays the entered data. If they are not there, then when you click on the button, we go to the screen with the input. When I enter text into the input and click on the Display Result button, the data should be substituted into the text field on the first screen. I implemented such functionality, but I don’t understand what argument I should substitute in main.dart. Tell me please
Text Screen:
import 'package:flutter/material.dart';
import 'package:flutter_application_1/screens/result_screen.dart';
class TextScreen extends StatefulWidget {
const TextScreen({Key? key}) : super(key: key);
#override
State<TextScreen> createState() => _TextScreenState();
}
class _TextScreenState extends State<TextScreen> {
TextEditingController textController = TextEditingController();
#override
void dispose() {
textController.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Enter data'),
),
body: Padding(
padding: const EdgeInsets.symmetric(horizontal: 16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.center,
children: [
TextField(
controller: textController,
decoration: InputDecoration(labelText: 'Message'),
),
const SizedBox(
height: 20,
),
ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
ResultScreen(textController.text)));
},
child: Text('Display result'))
],
)),
);
}
}
Result Screen:
import 'package:flutter/material.dart';
import 'package:flutter_application_1/screens/text_screen.dart';
class ResultScreen extends StatefulWidget {
final String valueText;
ResultScreen(this.valueText);
#override
State<ResultScreen> createState() => _ResultScreenState();
}
class _ResultScreenState extends State<ResultScreen> {
// navigation to text_screen
void _buttonNav() {
Navigator.push(
context, MaterialPageRoute(builder: (context) => const TextScreen()));
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Results'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ElevatedButton(
onPressed: _buttonNav, child: const Text('Enter data')),
const SizedBox(
height: 50,
),
Text(valueText),
const SizedBox(
height: 20,
),
],
)),
);
}
}
Main.dart:
import 'package:flutter/material.dart';
import 'package:flutter_application_1/screens/result_screen.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: ResultScreen(),
);
}
}
Use the following code.
What is does is, when we enter the first screen i.e. ResultScreen, we pass an empty value for the first time.
Use this in main.dart
home: ResultScreen(''),
And as you are using statefull widget for ResultScreen, you need to use widget.valueText to access it like:
Text(widget.valueText),
I have follow dialog box. When I click 'Next' I want it to navigate to GamePage() screen. But unfortunately it doesn't work.
Following is the GamePage Widget
class GamePage extends StatelessWidget {
final homeCtrl = Get.find<HomeController>();
GamePage({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: const Color(0xFF8fb1ca),
body: SafeArea(
child: ListView(
children: [
Padding(
padding: EdgeInsets.all(3.0.wp),
child: Row(
children: [
IconButton(
onPressed: () {
Get.back();
},
icon: const Icon(Icons.arrow_back),
),
],
),
),
Padding(
padding: EdgeInsets.symmetric(vertical: 4.0.wp),
child: Column(
children: [
SizedBox(
height: 2.0.wp,
),
Center(
child: Text(
'What ${homeCtrl.currentWord.first.wordtype} is this?',
style: TextStyle(
fontSize: 18.0.sp,
color: Colors.grey[800],
),
),
),
SizedBox(height: 10.0.wp),
WordsWidget(currentWord: homeCtrl.currentWord.first),
],
),
),
],
),
),
);
}
}
Following is the Word Widget being called from GamePage Widget
class WordsWidget extends StatelessWidget {
final currentWord;
WordsWidget({Key? key, this.currentWord}) : super(key: key);
final homeCtrl = Get.find<HomeController>();
#override
Widget build(BuildContext context) {
// var currentWord = homeCtrl.nextWord();
var shuffleword = [].obs;
shuffleword.addAll(homeCtrl.shuffleWord(currentWord.word));
TextToSpeech tts = TextToSpeech();
String language = 'en-US';
tts.setLanguage(language);
return Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
ElevatedButton(
onPressed: () {
print('pressed here');
Get.defaultDialog(
title: 'Go to next page',
content: Container(
child: Column(
children: [
Text('You are about to move to another screen'),
ElevatedButton.icon(
onPressed: () {
Get.to(() => GamePage());
},
icon: Icon(
Icons.arrow_right,
),
label: Text('Go'))
],
),
));
},
child: Text('Open Dialog')),
],
);
}
}
Get.back() is working but not Get.to
Try
ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (BuildContext context) {
return const GamePage();
},
),
);
},
child: Text("Next Word"),
)
Try this code -
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:image_memory/next_page.dart';
import 'package:image_picker/image_picker.dart';
void main() {
//check getMaterialApp is used
runApp(const GetMaterialApp(
title: 'Temp',
home: const MyApp(),
));
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
#override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Image Picker'),
),
body: Center(
child: ElevatedButton(
onPressed: () {
print('pressed here');
Get.defaultDialog(
title: 'Go to next page',
content: Container(
child: Column(
children: [
Text('You are about to move to another screen'),
ElevatedButton.icon(
onPressed: () {
Get.to(() => NextPage());
},
icon: Icon(
Icons.arrow_right,
),
label: Text('Go'))
],
),
));
},
child: Text('Open Dialog')),
),
);
}
}
and next page is -
import 'package:flutter/material.dart';
class NextPage extends StatefulWidget {
const NextPage({ Key? key }) : super(key: key);
#override
State<NextPage> createState() => _NextPageState();
}
class _NextPageState extends State<NextPage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Next Page'),
),
body: Container(
child: Center(
child: Text("this is next page"),
),
),
);
}
}
And yes, you need to insure that you are using 'GetMaterialApp'.
If you want to use GetX navigation system, you should wrap your application in a GetMaterialApp instead of MaterialApp.
So in your main use this:
class GetxApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return GetMaterialApp(
home: HomePage(),
);
}
}
Instead of this:
class NormalApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: HomePage(),
);
}
}
I am trying to have a global integer that is displayed in a widget and then is updated by something (a button click or something) from another widget. All of the other ways i have tried don't work. What is the best way to do this?
Stack overflow says i have too much code so more text more text more text
import 'package:flutter/material.dart';
void main() {
runApp(
MaterialApp(
home: Scaffold(
body: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
ScoreDisplay(),
PointButton(),
],
),
),
),
),
);
}
int score = 0;
class ScoreDisplay extends StatefulWidget {
#override
_ScoreDisplayState createState() => _ScoreDisplayState();
}
class _ScoreDisplayState extends State<ScoreDisplay> {
#override
Widget build(BuildContext context) {
return Center(
child: Container(
child: Text(
'Score: $score',
),
),
);
}
}
class PointButton extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Center(
child: Container(
child: RaisedButton(
//onPressed: //increment score,
),
),
);
}
}
You need to implement some kind of State Management for that.
Here are two basic ways to implement such a feature: with a StatefulWidget and with Riverpod.
1. With a StatefulWidget
I extracted your Scaffold as a StatefulWidget maintaining the score of your application.
I then use ScoreDisplay as a pure StatelessWidget receiving the score as a parameter. And your PointButton is also Stateless and call the ScorePage thanks to a simple VoidCallback function.
Full source code:
import 'package:flutter/material.dart';
void main() {
runApp(
MaterialApp(
home: ScorePage(),
),
);
}
class ScorePage extends StatefulWidget {
const ScorePage({
Key key,
}) : super(key: key);
#override
_ScorePageState createState() => _ScorePageState();
}
class _ScorePageState extends State<ScorePage> {
int score = 0;
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
ScoreDisplay(score: score),
PointButton(onIncrement: () => setState(() => score++)),
],
),
),
);
}
}
class ScoreDisplay extends StatelessWidget {
final int score;
const ScoreDisplay({Key key, this.score}) : super(key: key);
#override
Widget build(BuildContext context) {
return Center(
child: Container(
child: Text(
'Score: $score',
),
),
);
}
}
class PointButton extends StatelessWidget {
final VoidCallback onIncrement;
const PointButton({Key key, this.onIncrement}) : super(key: key);
#override
Widget build(BuildContext context) {
return Center(
child: Container(
child: ElevatedButton(
onPressed: () => onIncrement?.call(),
child: Text('CLICK ME'),
),
),
);
}
}
2. With Riverpod
Create a StateProvider:
final scoreProvider = StateProvider<int>((ref) => 0);
Watch the StateProvider:
final score = useProvider(scoreProvider).state;
Update the StateProvider
context.read(scoreProvider).state++
Full Source Code
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
void main() {
runApp(
ProviderScope(
child: MaterialApp(
home: Scaffold(
body: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
ScoreDisplay(),
PointButton(),
],
),
),
),
),
),
);
}
int score = 0;
class ScoreDisplay extends HookWidget {
#override
Widget build(BuildContext context) {
final score = useProvider(scoreProvider).state;
return Center(
child: Container(
child: Text(
'Score: $score',
),
),
);
}
}
class PointButton extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Center(
child: Container(
child: ElevatedButton(
onPressed: () => context.read(scoreProvider).state++,
child: Text('CLICK ME'),
),
),
);
}
}
final scoreProvider = StateProvider<int>((ref) => 0);
Check Riverpod Website for more info and more advanced use cases.
But you have many more flavors of State Management available.
The best example is to use "provider" package which can be found on www.pub.dev
It is very easy state management package that can help You solve this problem. Keep in my that provider instead of setState() uses notifyListener()
I want to intercept the back-button of the soft keyboard in flutter. So when I want to close the keyboard by pressing the back-button I want an additional function to be called.
How can I do that?
Keyboard Back button
you can use the keyboard_visibility package to achieve this.
Working Example
the following code displays a SnackBar once the keyboard is dismissed.
import 'package:flutter/material.dart';
import 'package:keyboard_visibility/keyboard_visibility.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
GlobalKey<ScaffoldState> _key;
#override
void initState() {
super.initState();
_key = GlobalKey<ScaffoldState>();
KeyboardVisibilityNotification().addNewListener(
onHide: () {
_key.currentState.showSnackBar(
SnackBar(
content: Text("Keyboard closed"),
),
);
},
);
}
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
key: _key,
body: Center(
child: TextField(),
),
),
);
}
}
you can use the https://pub.dev/packages/flutter_keyboard_visibility package to achieve this.
import 'package:flutter/material.dart';
import 'package:flutter_keyboard_visibility/flutter_keyboard_visibility.dart';
import 'package:flutter_keyboard_visibility_example/keyboard_dismiss_demo.dart';
import 'package:flutter_keyboard_visibility_example/provider_demo.dart';
void main() {
runApp(App());
}
class App extends StatelessWidget {
const App({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Demo(),
);
}
}
class Demo extends StatelessWidget {
#override
Widget build(BuildContext context) {
return KeyboardDismissOnTap(
child: Scaffold(
appBar: AppBar(
title: Text('Keyboard Visibility Example'),
),
body: Center(
child: Padding(
padding: EdgeInsets.all(24.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => ProviderDemo()),
);
},
child: Text('Provider Demo'),
),
ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => KeyboardDismissDemo()),
);
},
child: Text('KeyboardDismiss Demo'),
),
Spacer(),
TextField(
keyboardType: TextInputType.text,
decoration: InputDecoration(
labelText: 'Input box for keyboard test',
),
),
Container(height: 60.0),
KeyboardVisibilityBuilder(builder: (context, visible) {
return Text(
'The keyboard is: ${visible ? 'VISIBLE' : 'NOT VISIBLE'}',
);
}),
Spacer(),
],
),
),
),
),
);
}
}