I need to show text selection controls on:
setState( () {
textController.selection = TextSelection(baseOffset: 0, extentOffset: textController.text.length);
});
But it did not appear on the screen. So, how to force flutter show the cut/copy/paste menu?
I hope it helps you.
You can use Selectable Widget.
https://www.youtube.com/watch?v=ZSU3ZXOs6hc&list=PLjxrf2q8roU23XGwz3Km7sQZFTdB996iG&index=56
Second suggestion
When I test with below code, it works well.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: "App",
theme: new ThemeData(primarySwatch: Colors.amber),
home: Test(),
);
}
}
class Test extends StatefulWidget {
#override
_TestState createState() => _TestState();
}
class _TestState extends State<Test> {
TextEditingController controller = new TextEditingController(text: 'Kevin A');
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: "Title",
theme: new ThemeData(primarySwatch: Colors.amber),
home: Scaffold(
body: SafeArea(
child: TextField(
controller: controller,
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
controller.selection = new TextSelection(
baseOffset: 0,
extentOffset: controller.text.length,
);
showMenu(
context: context,
// TODO: Position dynamically based on cursor or textfield
position: RelativeRect.fromLTRB(0.0, 300.0, 300.0, 0.0),
items: [
PopupMenuItem(
child: Row(
children: <Widget>[
// TODO: Dynamic items / handle click
PopupMenuItem(
child: Text(
"Paste",
style: Theme.of(context)
.textTheme
.body2
.copyWith(color: Colors.red),
),
),
PopupMenuItem(
child: Text("Select All"),
),
],
),
),
],
);
},
child: Icon(Icons.navigation),
backgroundColor: Colors.green,
),
),
);
}
}
Related
Hello flutter family I stucked in changing the color of the three-dot button of the popup menu button in my flutter project please anyone help me to clear this error
how to achieve this
my code
PopupMenuButton<Menumodels>(color: Colors.grey,
onSelected: (item)=>onSelected(context,item),
itemBuilder: (context)=>[...MenuItems.items.map(buildItem).toList(
)])
],
PopupMenuItem<Menumodels>buildItem(
Menumodels item)=>PopupMenuItem<Menumodels>(value: item,
child: Row(
children: [
Icon(item.icon,color: Colors.black,size: 20),
SizedBox(width: 11),
Text(item.text),
],
));
You can use icon param
PopupMenuButton(
icon: Icon(Icons.more_vert,color: Colors.white), // add this line
itemBuilder: (_) => ......,
onSelected:....
)
Hope this will work for you.
import 'package:flutter/material.dart';
// This is the type used by the popup menu below.
enum Menu { itemOne, itemTwo, itemThree, itemFour }
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
static const String _title = 'Flutter Code Sample';
#override
Widget build(BuildContext context) {
return const MaterialApp(
title: _title,
home: MyStatefulWidget(),
);
}
}
class MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({super.key});
#override
State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
String _selectedMenu = '';
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
actions: <Widget>[
// This button presents popup menu items.
PopupMenuButton<Menu>(
icon: Icon(Icons.more_vert,color: Colors.white), //add this
// Callback that sets the selected popup menu item.
onSelected: (Menu item) {
setState(() {
_selectedMenu = item.name;
});
},
itemBuilder: (BuildContext context) => <PopupMenuEntry<Menu>>[
const PopupMenuItem<Menu>(
value: Menu.itemOne,
child: Text('Item 1'),
),
const PopupMenuItem<Menu>(
value: Menu.itemTwo,
child: Text('Item 2'),
),
const PopupMenuItem<Menu>(
value: Menu.itemThree,
child: Text('Item 3'),
),
const PopupMenuItem<Menu>(
value: Menu.itemFour,
child: Text('Item 4'),
),
]),
],
),
body: Center(
child: Text('_selectedMenu: $_selectedMenu'),
),
);
}
}
The easy way of doing this overriding the icon as #Rohan Jariwala shown on his post. The icon color comes from iconTheme's color. You can override it on theme level like
Theme(
data: Theme.of(context).copyWith(
iconTheme: IconTheme.of(context).copyWith(
color: Colors.amber,
)),
child: PopupMenuButton(
I want to use a Dismissible Widget in a PopupMenuButton to delete items in the popup list.
My example code (see the example main() code below) works for deleting an item (String) in the PopupMenuButton, but the list is not refreshed and resized letting a blank space in the list while the popup is still displayed.
The list is only displayed resized after the popup is closed and then reopened.
I remove the item from the list in a setState in the onDismissed callback so the widget tree should be rebuild.
How can I update and resize the displayed list in the popup without having to close and reopen it?
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter PopupMenuButton sample',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
String dropdownValue = 'Orange';
final _items = [
'Orange',
'Banana',
'Grapes',
'Apple',
'watermelon',
'Pineapple'
];
#override
Widget build(BuildContext context) {
print("build Scaffold");
return Scaffold(
appBar: AppBar(
title: Text("DropDownList Example"),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text("$dropdownValue"),
const Spacer(),
PopupMenuButton<String>(
icon: Icon(Icons.bookmarks_outlined),
onSelected: (String value) {
setState(() {
dropdownValue = value;
});
print(value);
},
itemBuilder: (BuildContext context) {
return _items.map<PopupMenuItem<String>>((String _value) {
return PopupMenuItem(
value: _value,
child: Dismissible(
key: UniqueKey(),
direction: DismissDirection.endToStart,
onDismissed: (i) {
print("onDismissed $_value");
setState(() {
_items.remove(_value);
});
},
child: ListTile(
title: Text(_value),
trailing: const Icon(Icons.arrow_back),
),
background: Container(
color: Colors.red,
margin: const EdgeInsets.symmetric(horizontal: 15),
alignment: Alignment.centerRight,
child: const Icon(
Icons.delete,
color: Colors.white,
),
),
),
);
}).toList();
},
),
const Spacer(
flex: 10,
),
],
),
),
);
}
}
My dropdown button's popup position is incorrect. I don't get what's causing this issue, popup moves in the right side of the button, its somewhat related to the Row widget and builder. I am on the master branch. Check the sample code here
DartPad Sample
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
builder: (context, child) => Scaffold(
body: Row(
children: [
Container(
width: 200,
color: Colors.blue,
child: Column(children: [
Text("Side Menu"),
])
),
Expanded(child: child),
],
),
),
initialRoute: "/",
onGenerateRoute: (_) => MaterialPageRoute(
builder: (BuildContext context) => Center(
child: DropdownButton(
hint: Text("test"),
value: 0,
items: [
DropdownMenuItem(child: Text("test 1"), value: 0),
DropdownMenuItem(child: Text("test 2"), value: 1),
DropdownMenuItem(child: Text("test 3"), value: 2),
],
onChanged: (value) {},
),
),
),
);
}
}
Try implementing this code, it will definitely work Good luck :)
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
/// This Widget is the main application widget.
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> {
String dropdownValue = 'One';
#override
Widget build(BuildContext context) {
return DropdownButton<String>(
value: dropdownValue,
icon: Icon(Icons.arrow_downward),
iconSize: 24,
elevation: 16,
style: TextStyle(color: Colors.deepPurple),
underline: Container(
height: 2,
color: Colors.deepPurpleAccent,
),
onChanged: (String newValue) {
setState(() {
dropdownValue = newValue;
});
},
items: <String>['One', 'Two', 'three', 'Four']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
);
}
}
This is my code don't know why its not moving to screen 2 on button press:
Am beginner in dart/flutter please help. On press of button it's not showing screen2
//main.dart
import 'package:flutter/material.dart';
import 'screen_1.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Screen1(),
);
}
}
//screen_1.dart
import 'package:flutter/material.dart';
import 'screen_2.dart';
class Screen1 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Screen 1'),
),
body: Container(
child: Center(
child: RaisedButton(
color: Colors.pink,
child: Text(
'Go to Screen 2',
style: TextStyle(
color: Colors.white,
),
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return Screen2();
},
),
);
},
),
),
),
);
}
}
//screen_2.dart
import 'package:flutter/material.dart';
class Screen2 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.blue,
title: Text('Screen 2'),
),
body: Center(
child: RaisedButton(
color: Colors.blue,
child: Text('Go Back To Screen 1'),
onPressed: () {},
),
),
);
}
}
onPressed of Screen1 class should show Screen2 but it's not happening.
I tried this and it does move to Screen2:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Screen1(),
);
}
}
//screen_1.dart
class Screen1 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Screen 1'),
),
body: Container(
child: Center(
child: RaisedButton(
color: Colors.pink,
child: Text(
'Go to Screen 2',
style: TextStyle(
color: Colors.white,
),
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return Screen2();
},
),
);
},
),
),
),
);
}
}
//screen_2.dart
class Screen2 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.blue,
title: Text('Screen 2'),
),
body: Center(
child: RaisedButton(
color: Colors.blue,
child: Text('Go Back To Screen 1'),
onPressed: () {},
),
),
);
}
}
This may be because StatelessWidget is part of material.dart yet you failed to import it in the first dart file.
my drop down box cycles through 5 strings
['blue','red','yellow','orange','grey']
I want my appbar title to be that dropdown box and for the value in the dropdown to determine the appbar color
DropDownWidget ddw = DropDownWidget();
var color = {
"blue": Colors.blue,
"red": Colors.red,
"yellow": Colors.yellow,
"orange": Colors.orange,
"grey": Colors.grey,
};
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
centerTitle: true,
title: ddw,
backgroundColor: color[ddw],
),
}
The dropdown (ddw) shows up as the title, no problem.
I made a dictionary with those strings as the keys and the corresponding color as the value, but I am not able to use the string value of the dropdown to change the background.
Any suggestions?
You can copy paste run full code below
You can call setState in onChanged of DropdownButton
code snippet
appBar: AppBar(
backgroundColor: _appbarColor,
...
DropdownButton<Item>(
hint: Text("Select item"),
value: selectedColor,
onChanged: (Item Value) {
setState(() {
selectedColor = Value;
_appbarColor = selectedColor.color;
});
},
working demo
full code
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class Item {
const Item(this.name, this.color);
final String name;
final Color color;
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
Color _appbarColor = Colors.blue;
Item selectedColor;
List<Item> colorList = <Item>[
const Item('blue', Colors.blue),
const Item('red', Colors.red),
const Item('yellow', Colors.yellow),
];
void _incrementCounter() {
setState(() {
_counter++;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: _appbarColor,
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
DropdownButton<Item>(
hint: Text("Select item"),
value: selectedColor,
onChanged: (Item Value) {
setState(() {
selectedColor = Value;
_appbarColor = selectedColor.color;
});
},
items: colorList.map((Item item) {
return DropdownMenuItem<Item>(
value: item,
child: Row(
children: <Widget>[
Container(
height: 15,
width: 15,
color: item.color,
),
SizedBox(
width: 10,
),
Text(
item.name,
style: TextStyle(color: Colors.black),
),
],
),
);
}).toList()),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}