I am trying to perform a dispatch action from a method. Here is how I am trying
StoreConnector<AppState, AppState>(
converter: (store) => store.state,
builder: (context, items) => Column(
children: <Widget>[
Text(items.rahi),
Text(items.mySiteUrl),
RaisedButton(
child: Text('update rahi'),
onPressed: (){_updateRahi(store);},
),
],
)
),
You can see I have cakked updateRahi method and inside this method
void _updateRahi(store){
var text = status.text;
// want to call dispatch action from here
store.dispatch('this is some texts');
}
I want to call the dispatch action. How can I call from here? Thank you.
You can do:
import 'package:flutter_redux/flutter_redux.dart';
StoreConnector<AppState, AppState>(
converter: (store) => store.state,
builder: (context, items) => Column(
children: <Widget>[
Text(items.rahi),
Text(items.mySiteUrl),
RaisedButton(
child: Text('update rahi'),
onPressed: (){_updateRahi();},
),
],
)
),
void _updateRahi(){
final store = StoreProvider.of<AppState>(context);
var text = status.text;
store.dispatch('this is some texts');
}
Related
I'm trying to make a list of items using ListWheelScrollView and I want to have the ability of tapping on items but it seems onTap doesn't work.
Here is a simple code
List<int> numbers = [
1,
2,
3,
4,
5
];
...
Container(
height: 200,
child: ListWheelScrollView(
controller: fixedExtentScrollController,
physics: FixedExtentScrollPhysics(),
children: numbers.map((month) {
return Card(
child: GestureDetector(
onTap: () {
print(123);
},
child: Row(
children: <Widget>[
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
month.toString(),
style: TextStyle(fontSize: 18.0),
),
)),
],
),
));
}).toList(),
itemExtent: 60.0,
),
)
Is there something wrong with this code ? I'm pretty sure something like this will work on a ListView or other scrolling widgets.
I solved the problem. I hope is helpful.
create a int variable in State class.
class _MenuWheelState extends State {
int _vIndiceWheel;
in the Function onSelectedItemChanged of the ListWheelScrollView set the variable:
onSelectedItemChanged: (ValueChanged) {
setState(() {
_vIndiceWheel = ValueChanged; });
},
create a GestureDetecture and put the ListWheelScrollView inside:
GestureDetector(
child: ListWheelScrollView(...
create onTap function at the GestureDetecture like this code:
// this is necessary
if (_vIndiceWheel == null) {
_vIndiceWheel = 0;
}
switch (_vIndiceWheel) {
case 0:
{
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return YourSecondScreen();
},
...
In my flutter app, i want that when i press a IconButton, the app show the image that i click in a new container.
This is my code:
Widget build(BuildContext context) {
return Container(
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
0 < favorites.length
? IconButton(
icon: Image.network(favorites[0]),
onPressed: (){
return new Container(
child: Column(
children: <Widget>[
Image.network(favorites[0])
],
),
);
},
)
: Container(),
]));
}
i want that image that i click show up in the black rectangle:
https://i.stack.imgur.com/YqOYa.png
The return value of onPressed is just ignored.
final VoidCallback onPressed;
returning from a callback passed around does not return the enclosing function (build()) and therefore returning the container won't have any effect.
What you rather want is something like
onPressed: () {
setState(() {isPressed = true;})
}
bool isPressed = false;
build() {
if(isPressed) {
return new Container(
child: Column(
children: <Widget>[
Image.network(favorites[0])
],
),
);
} else {
return /* as you have it in your question */
}
}
Calling setState() will cause build() to be executed again and there you can check the flat isPressed (or perhaps better name it wasPressed) and return different content this time.
You have to do something like:
List<String> favorites;
String selectedIcon;
Widget build(BuildContext context) {
return Column(
children: <Widget>[
Row(children: favorites.map((String src) => IconButton(
icon: Image.network(src),
onPressed: (){
setState(() {
selectedIcon = src;
});
},
)).toList(),),
Container(
child: Image.network(selectedIcon),
)
],
);
}
There are no alignment, styles, decoration in this code, I think you can add what you need by yourself
I am building a quiz app which reveals the explanation for the correct answer after the user submits their chosen answer.
There are two buttons on the layout -- "Next Question" & "Submit Answer."
In the initial state, the "Next Question" button is subtle as it is not clickable and only the "Submit Answer" buttons is clickable.
Click Here to View the Layout of the Initial State
When the "Submit Answer" button is clicked, two actions should happen:
1. The "Submit Answer" button then becomes subtle and not clickable and the "Next Question" button becomes bold and vibrant and, of course, clickable.
2. Also, below the row of the two buttons, an additional section appears (another container maybe, i don't know) revealing the explanation for the correct answer.
I'd like some help in implementing the above two actions
So far, this is the code that I have:
Widget nextQuestion = new RaisedButton(
padding: const EdgeInsets.all(10.0),
child: const Text('Next Question'),
color: Color(0xFFE9E9E9),
elevation: 0.0,
onPressed: () {
null;
},
);
Widget submitAnswer = new RaisedButton(
padding: const EdgeInsets.all(10.0),
child: const Text('Submit Answer'),
color: Color(0xFFE08284),
elevation: 5.0,
onPressed: () {
null;
},
);
return Scaffold(
body: new CustomScrollView(
slivers: <Widget>[
new SliverPadding(
padding: new EdgeInsets.all(0.0),
sliver: new SliverList(
delegate: new SliverChildListDelegate([
new Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
mainAxisSize: MainAxisSize.min,
children: <Widget>[nextQuestion, submitAnswer]),
new SizedBox(height: 50.0),
]),
),
),
],
),
);
you can implement using setState method.
i implement something like that just go through that.
import 'package:flutter/material.dart';
void main() {
runApp(MaterialApp(
title: 'Demo',
initialRoute: '/',
routes: {
'/': (context) => FirstScreen(),
'/second': (context) => SecondScreen(),
},
));
}
class FirstScreen extends StatefulWidget {
#override
_FirstScreenState createState() => _FirstScreenState();
}
class _FirstScreenState extends State<FirstScreen> {
int submit = 0;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Demo"),
),
body: new Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Row(
children: <Widget>[
new RaisedButton(
padding: const EdgeInsets.all(10.0),
child: const Text('Next Question'),
color: submit == 0 ? Color(0xFFE9E9E9) : Colors.grey,
elevation: 0.0,
onPressed: () {
submit == 0 ? null : Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondScreen()),
);
}
),
new RaisedButton(
padding: const EdgeInsets.all(10.0),
child: const Text('Submit Answer'),
color: Color(0xFFE08284),
elevation: 0.0,
onPressed: () {
setState(() {
submit = 1;
});
},
),
],
),
submit == 1 ? new Container(
child: new Text("hello World"),
) : new Container()
],
)
);
}
}
class SecondScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Second Screen"),
),
body: Center(
child: RaisedButton(
onPressed: () {
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}
I've created a flutter app where I'm managing array for todolist in app. I've can add the text by add button.
I've created a widget to show in list.
My question is how am i supposed manage the UI of individual.
Code:
import 'package:flutter/material.dart';
class TodoList extends StatefulWidget {
_TodoListState createState() => new _TodoListState();
}
class _TodoListState extends State<TodoList> {
List _list = new List();
Widget listTile({String data: '[Empty data]'}) {
bool _writable = false;
TextEditingController _textController = new TextEditingController(text: data);
String _text = _textController.text;
if(!_writable){
return new Row(
children: <Widget>[
new Expanded(
child: new Text(data)
),
new IconButton(icon: new Icon(Icons.edit),
onPressed: () {
// setState(() {
_writable = ! _writable;
print(_writable.toString());
// });
}),
new IconButton(icon: new Icon(Icons.remove_circle), onPressed: null),
],
);
} else {
return new Row(
children: <Widget>[
new Expanded(
child: new TextField( controller: _textController )
),
new IconButton(icon: new Icon(Icons.done), onPressed: null),
],
);
}
}
void addInList(String string) {
print(string);
setState(() {
_list.add(string);
});
print(_list);
}
void removeFromList(int index){
}
static final TextEditingController _textController = new TextEditingController();
String get _text => _textController.text;
#override
Widget build(BuildContext context) {
Widget adderTile = new Row(
children: <Widget>[
new Expanded(
child:
new TextField(
textAlign: TextAlign.center,
controller: _textController ,
decoration: new InputDecoration( hintText: 'New item.!' ),
),
),
new IconButton(icon: new Icon(Icons.add), onPressed: (){addInList(_text);}),
],
);
return new MaterialApp(
title: 'TodoList',
home: new Scaffold(
appBar: new AppBar(title: new Text('TodoList'),),
body: new Column(
children: <Widget>[
adderTile,
new ListView.builder(
shrinkWrap: true,
itemCount: _list.length,
itemBuilder: (context, int index){
return listTile(data: _list[index]);
}
),
],
),
),
);
}
}
if i change _writable inside setState then it rerenders widget and _writable becomes false again. if i do it without setState, then _writable becomes true but widget doesn't rerender.
P.S.: i don't want to add another array in to manage which is writable and which is not. Thanks in advance.
The variable
bool _writable = false;
is declared as local variable in the method listTile(), but should be moved next to List _list = new List(); to become a member variable. Then use setState() to set it and rebuild the view.
Edit:
You should create a dedicated StatefulWidget (TodoListEntry), having _writable as member as suggested above. Move almost the whole method body of listTile(...) to the build()-method of the TodoListEntryState, make the parameter String data also a member and pass the value via the constructor.
I'm new to Flutter,
I want to destruct cards created initially and construct them again as per data provided in API call.
Basically when I tap on button in UI, it should call APIs and based on data from API call, if it is different from the data I already have, I want to destruct cards and construct them again.
How I can achieve this?
The cards will auto update their content when you make the call again, it is like refreshing your data.
I have made a simple example with a single card that shows data from this JSON Where I am calling the API first time in initState and then repeating the call each time I press on the FAB.
I am adding the index variable just to show you the updates (updating my single card with the next item in the list)
Also it is worth noting that I am handling the null or empty values poorly for the sake of time.
Also forget about the UI overflow ¯_(ツ)_/¯
class CardListExample extends StatefulWidget {
#override
_CardListExampleState createState() => new _CardListExampleState();
}
class _CardListExampleState extends State<CardListExample> {
Map cardList = {};
int index = 0;
#override
void initState() {
_getRequests();
super.initState();
}
_getRequests() async {
String url = "https://jsonplaceholder.typicode.com/users";
var httpClinet = createHttpClient();
var response = await httpClinet.get(
url,
);
var data = JSON.decode(response.body);
//print (data);
setState(() {
this.cardList = data[index];
this.index++;
});
print(cardList);
print(cardList["name"]);
}
#override
Widget build(BuildContext context) {
return new Scaffold(
floatingActionButton:
new FloatingActionButton(onPressed: () => _getRequests()),
appBar: new AppBar(
title: new Text("Card List Example"),
),
body: this.cardList != {}
? new ListView(children: <Widget>[
new Card(
child: new Column(
children: <Widget>[
new Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
new Text(
cardList["name"] ?? '',
style: Theme.of(context).textTheme.display1,
),
new Text(
this.cardList['email'] ?? '',
maxLines: 50,
),
],
),
new Text(cardList["website"] ?? '')
],
),
),
])
: new Center(child: new CircularProgressIndicator()),
);
}
}
Yes, Answer from Aziza works.
Though I used the code as below :
void main() =>
runApp(new MaterialApp(
onGenerateRoute: (RouteSettings settings) {
switch (settings.name) {
case '/about':
return new FromRightToLeft(
builder: (_) => new _aboutPage.About(),
settings: settings,
);
}
},
home : new HomePage(),
theme: new ThemeData(
fontFamily: 'Poppins',
primarySwatch: Colors.blue,
),
));
class HomePage extends StatefulWidget{
#override
HomePageState createState() => new HomePageState();
}
class HomePageState extends State<HomePage>{
List data;
Future<String> getData() async{
var response = await http.get(
Uri.encodeFull(<SOMEURL>),
headers: {
"Accept" : "application/json"
}
);
this.setState((){
data = JSON.decode(response.body);
});
return "Success";
}
#override
void initState() {
// TODO: implement initState
super.initState();
this.getData();
}
#override
Widget build(BuildContext context){
return new Scaffold(
appBar : new AppBar(
title : new Text("ABC API"),
actions: <Widget>[
new IconButton( // action button
icon: new Icon(Icons.cached),
onPressed: () => getData(),
)],
),
drawer: new Drawer(
child: new ListView(
children: <Widget> [
new Container(
height: 120.0,
child: new DrawerHeader(
padding: new EdgeInsets.all(0.0),
decoration: new BoxDecoration(
color: new Color(0xFFECEFF1),
),
child: new Center(
child: new FlutterLogo(
colors: Colors.blueGrey,
size: 54.0,
),
),
),
),
new ListTile(
leading: new Icon(Icons.chat),
title: new Text('Support'),
onTap: () {
Navigator.pop(context);
Navigator.of(context).pushNamed('/support');
}
),
new ListTile(
leading: new Icon(Icons.info),
title: new Text('About'),
onTap: () {
Navigator.pop(context);
Navigator.of(context).pushNamed('/about');
}
),
new Divider(),
new ListTile(
leading: new Icon(Icons.exit_to_app),
title: new Text('Sign Out'),
onTap: () {
Navigator.pop(context);
}
),
],
)
),
body: this.data != null ?
new ListView.builder(
itemCount: data.length,
itemBuilder: (BuildContext context, int index){
return new Container(
padding: new EdgeInsets.fromLTRB(8.0,5.0,8.0,0.0),
child: new Card(
child: new Padding(
padding: new EdgeInsets.fromLTRB(10.0,12.0,8.0,0.0),
child: new Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
new ListTile(
enabled: data[index]['active'] == '1' ? true : false,
title: new Text(data[index]['header'],
style:Theme.of(context).textTheme.headline,
),
subtitle: new Text("\n" + data[index]['description']),
),
new ButtonTheme.bar(
child: new ButtonBar(
children: <Widget>[
new FlatButton(
child: new Text(data[index]['action1']),
onPressed: data[index]['active'] == '1' ? _launchURL :null,
),
],
),
),
],
),
),
),
);
},
)
:new Center(child: new CircularProgressIndicator()),
);
}
}
_launchURL() async {
const url = 'http://archive.org';
if (await canLaunch(url)) {
await launch(url);
} else {
throw 'Could not launch $url';
}
}
class FromRightToLeft<T> extends MaterialPageRoute<T> {
FromRightToLeft({ WidgetBuilder builder, RouteSettings settings })
: super(builder: builder, settings: settings);
#override
Widget buildTransitions(
BuildContext context,
Animation<double> animation,
Animation<double> secondaryAnimation,
Widget child) {
if (settings.isInitialRoute)
return child;
return new SlideTransition(
child: new Container(
decoration: new BoxDecoration(
boxShadow: [
new BoxShadow(
color: Colors.black26,
blurRadius: 25.0,
)
]
),
child: child,
),
position: new Tween(
begin: const Offset(1.0, 0.0),
end: const Offset(0.0, 0.0),
)
.animate(
new CurvedAnimation(
parent: animation,
curve: Curves.fastOutSlowIn,
)
),
);
}
#override Duration get transitionDuration => const Duration(milliseconds: 400);
}
The above code includes Navigation drawer, page navigation animation and also answer to the above question.