How to toggle boolean value received from another widget - flutter

I would like to pass boolean initial boolean values as arguments to a stateful widget and then change its value besides updating the UI. As it stands, I only see the initial value and am not able to toggle the value. The code and the screenshots are as follows:
This is the widget from which I'm passing the arguments:
class OtherStuff extends StatefulWidget {
OtherStuffState createState() => OtherStuffState();
}
class OtherStuffState extends State<OtherStuff> {
#override
Widget build(BuildContext context) {
var provider = Provider.of<ModelClass>(context).data;
// TODO: implement build
return Container(
width: double.infinity,
height: 150,
color: Colors.transparent,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
margin: const EdgeInsets.only(left: 5),
child: const Text('Gets more interested with this', style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 18
)),
),
SizedBox(height: 5),
Row(
children: [
StuffCards('https://static.toiimg.com/thumb/60892473.cms?imgsize=159129&width=800&height=800', false), //passing first value as false
SizedBox(width: 10),
StuffCards('https://thestayathomechef.com/wp-content/uploads/2016/06/Fried-Chicken-4-1.jpg', true), //passing second value as true
SizedBox(width: 10),
StuffCards('https://www.foodrepublic.com/wp-content/uploads/2012/03/033_FR11785.jpg', false), //passing third value as false
],
)
],
)
);
}
}
The stateful widget:
class StuffCards extends StatefulWidget {
final String imageUrl;
final bool clickedValue; //receiving the argument
StuffCards(this.imageUrl, this.clickedValue);
StuffCardsState createState() => StuffCardsState();
}
class StuffCardsState extends State<StuffCards> {
#override
Widget build(BuildContext context) {
var clicked = widget.clickedValue;
void clickedFav() {
setState(() {
clicked = !clicked; //toggling the value received
});
}
// TODO: implement build
return Stack(
children: [
// Container(
// width: 120,
// ),
Positioned(
child: Container(
width: 110,
height: 120,
margin: const EdgeInsets.only(left: 10),
decoration: BoxDecoration(
color: Theme.of(context).primaryColorDark,
borderRadius: const BorderRadius.only(
topRight: Radius.circular(100),
topLeft: Radius.circular(100),
bottomRight: Radius.circular(20),
bottomLeft: Radius.circular(20),
)
),
child: Padding(
padding: const EdgeInsets.only(top: 60),
child: Container(
width: double.infinity,
height: 60,
decoration: BoxDecoration(
color: Theme.of(context).primaryColorDark,
),
child: Column(
children: [
Text('Fried Squid', style: TextStyle(
fontWeight: FontWeight.bold,
color: Colors.white
)),
Container(
width: 75,
color: Colors.transparent,
child: Text(
'₹ 245', style: TextStyle(
fontWeight: FontWeight.bold,
color: Colors.white,
fontSize: 20
)),
),
Container(
width: double.infinity,
height: 16,
padding: EdgeInsets.only(right: 2, bottom: 1),
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
InkWell(
onTap: clickedFav, //The inkwell doesn't seem to respond and update the UI
child: clicked ? Icon(
Icons.favorite,
color: Colors.red,
size: 15
) : Icon(
Icons.favorite_border,
color: Colors.white,
size: 15
)
)
],
),
)
],
),
),
),
),
),
Strangely enough, upon clicking the Inkwell widget, the value does get changed i.e If I click it and if the boolean value is false, it gets changed to true but doesn't change back to false. Also, as stated again, the UI doesn't update.

Your UI doesn't change because
StuffCards('https://static.toiimg.com/thumb/60892473.cms?imgsize=159129&width=800&height=800', false),
Will never change. When you call setstate in the StuffCards class, the widget gets a rebuild, but with the same parameters.
So you have two options here
you make a function in the OtherStuffState class that toggles the value, and you pass that function on to the StuffCards class, en you call that function when the ontap event occurs in the InkWell.
you use provider to store the data and you make a function in the modelclass to toggle the card, so you just have to call in the StuffCards class context.read<ModelClass>().toggleCard(cardNumber)

Related

Why doesn't my state change in my stateful widget even when I pass data through constructors flutter?

Hello guys i have two stateful widget InactiveCustomersListView and MessageCustomerHeader
InactiveCustomersListView has a List of tiles, and these tiles have checkboxes
class InactiveCustomersListView extends StatefulWidget {
final bool checkAll;
const InactiveCustomersListView({
Key key,
this.checkAll,
}) : super(key: key);
#override
State<InactiveCustomersListView> createState() =>
_InactiveCustomersListViewState();
}
class _InactiveCustomersListViewState extends State<InactiveCustomersListView> {
bool checkAll;
List<CheckBoxModel> listOfCustomers = [];
#override
void initState() {
listOfCustomers.addAll({
CheckBoxModel(selected: false),
});
super.initState();
}
#override
Widget build(BuildContext context) {
final controller = Get.put(CustomersController());
return ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: listOfCustomers.length,
itemBuilder: (context, index) {
return Obx(() {
return Container(
color: Color(0xffFFFFFF),
child: ListTile(
contentPadding: controller.isCheboxVisible.isTrue
? EdgeInsets.only(left: 0, right: 22, top: 10, bottom: 10)
: EdgeInsets.only(left: 22, right: 22, top: 10, bottom: 10),
horizontalTitleGap: 5,
leading: controller.isCheboxVisible.isTrue
? Visibility(
visible: controller.isCheboxVisible.value,
child: Transform.scale(
scale: 1.3,
child: Checkbox(
side: MaterialStateBorderSide.resolveWith(
(Set<MaterialState> states) {
if (states.contains(MaterialState.selected)) {
return const BorderSide(
width: 2, color: Color(0xff34495E));
}
return const BorderSide(
width: 1, color: Color(0xffB0BEC1));
},
),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(5)),
activeColor: Color(0xff34495E),
//materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
//visualDensity: VisualDensity(horizontal: -4, vertical: -4),
value: listOfCustomers[index].selected,
onChanged: (value) {
setState(() {
listOfCustomers[index].selected = value;
final check = listOfCustomers
.every((element) => element.selected);
checkAll = check;
});
},
),
),
)
: null,
title: Row(
children: [
SizedBox(
width: 60,
height: 60,
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(80)),
child: CachedNetworkImage(
height: 100,
width: double.infinity,
fit: BoxFit.cover,
imageUrl:
Get.find<AuthService>().user.value.avatar.thumb,
placeholder: (context, url) => Image.asset(
'assets/img/loading.gif',
fit: BoxFit.cover,
width: double.infinity,
height: 80,
),
errorWidget: (context, url, error) =>
Icon(Icons.error_outline),
),
),
),
SizedBox(
width: 10,
),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
'John Cletus',
style: GoogleFonts.poppins(
fontSize: 14,
fontWeight: FontWeight.w500,
color: Color(0xff151515)),
),
Container(
decoration: BoxDecoration(
color: Color(0xffECF0F1),
borderRadius: BorderRadius.circular(20),
),
child: Padding(
padding: const EdgeInsets.only(
left: 10.0,
right: 10.0,
top: 5.0,
bottom: 5.0),
child: Text(
'Inactive',
style: GoogleFonts.poppins(
fontSize: 10,
fontWeight: FontWeight.w400,
color: Color(0xff7F8D90)),
),
),
),
],
),
SizedBox(
height: 10,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
Text(
'2',
style: GoogleFonts.poppins(
fontSize: 14,
fontWeight: FontWeight.w500,
color: Color(0xff151515)),
),
SizedBox(
width: 5,
),
Text(
'jobs',
style: GoogleFonts.poppins(
fontSize: 12,
fontWeight: FontWeight.w400,
color: Color(0xff151515)),
),
],
),
Text(
'Last job 5 days ago',
style: GoogleFonts.poppins(
fontSize: 9,
fontStyle: FontStyle.italic,
fontWeight: FontWeight.w400,
color: Color(0xff151515)),
),
],
),
],
),
),
],
),
),
);
});
});
}
}
class CheckBoxModel {
bool selected;
CheckBoxModel({this.selected});
}
MessageCustomerHeader widget class has a checkbox that controls the Check boxes in the InactiveCustomersListView widget class:
class MessageCustomerHeader extends StatefulWidget {
final List<CheckBoxModel> listOfCustomers;
const MessageCustomerHeader({
Key key,
this.listOfCustomers,
}) : super(key: key);
#override
State<MessageCustomerHeader> createState() => _MessageCustomerHeaderState();
}
class _MessageCustomerHeaderState extends State<MessageCustomerHeader> {
bool checkAll = false;
#override
Widget build(BuildContext context) {
return Container(
color: Colors.white,
child: Padding(
padding: const EdgeInsets.all(20.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Select customers you woult like to message',
style: GoogleFonts.poppins(
color: Color(0xff596780).withOpacity(0.8),
fontSize: 14,
fontWeight: FontWeight.w500),
),
SizedBox(
height: 10,
),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Transform.scale(
scale: 1.3,
child: Checkbox(
side: MaterialStateBorderSide.resolveWith(
(Set<MaterialState> states) {
if (states.contains(MaterialState.selected)) {
return const BorderSide(
width: 2, color: Color(0xff34495E));
}
return const BorderSide(
width: 1, color: Color(0xffB0BEC1));
},
),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(5)),
activeColor: Color(0xff34495E),
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
visualDensity: VisualDensity(horizontal: -4, vertical: -4),
value: checkAll,
onChanged: (value) {
setState(() {
checkAll = value;
widget.listOfCustomers.forEach((element) {
element.selected = value;
});
});
},
),
),
SizedBox(
width: 10,
),
Text(
'Select all',
style: GoogleFonts.poppins(
color: Colors.black87,
fontSize: 12,
fontWeight: FontWeight.w400),
),
],
),
],
),
),
);
}
}
I tried using constructor to pass "listOfCustomers" from InactiveCustomersListView widget to MessageCustomerHeader widget
And also passing "checkAll" from MessageCustomerHeader to InactiveCustomersListView widget by also using constructors.
The problem is having is that when i click on the checkbox in MessageCustomerHeader widget to check all the check boxes in InactiveCustomersListView widget, the state don't seem to change and it doesn't even after setting all the logic. What am i doing wrong guys and how do i resolve this issue :(
This is the error i get when i tap the checkbox on the MessageCustomerHeader checkbox.
"The method 'forEach' was called on null.
Receiver: null
Tried calling: forEach(Closure: (CheckBoxModel) => Null)"
Thank you.
If you have the proper lints enabled you would have seen this warning: DON'T put any logic in createState().
From the associated description:
Implementations of createState() should return a new instance of a State object and do nothing more. Since state access is preferred via the widget field, passing data to State objects using custom constructor parameters should also be avoided and so further, the State constructor is required to be passed no arguments.
(emphasis added)
You are passing arguments to your State constructors. Instead, use widget.checkAll and widget.listOfCustomers to access widget properties from the state objects.
Also:
It would be better to specify a type for checkAll. In your code you just have final checkAll;.
It is difficult to read the screen shot of the error message. It would be better to include the error message as text in the question, along with an indication in your code of the line to which the error message is referring.

Pass a parameters to stateful class

How can I pass a parameters to a stateful class in flutter?
I couldn't pass a parameter in the class as I'm a beginner and don't know the method.
I want to pass data from a list to build the class x times, and display the data in a container.
The text I want to pass is labeled tH.
I hope if someone can pass the argument for me.
My class:
class Thkr extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return _ThkrState();
}
}
class _ThkrState extends State<Thkr> {
int Thkr_count = 3;
void _incrementCounter() {
setState(() {
Thkr_count--;
});
}
#override
Widget build(BuildContext) {
return (Column(children: [
Container(
padding: EdgeInsets.all(35),
margin: EdgeInsets.all(20),
decoration: BoxDecoration(
border: Border.all(color: Colors.black, width: 3),
borderRadius: BorderRadius.circular(8),
boxShadow: [
BoxShadow(
color: Colors.lightGreen,
offset: Offset(6.0, 6.0),
),
],
),
child: Text({here I want to pass the data},
style: TextStyle(fontSize: textSize, color: themeli[themei])),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Card(
child: SizedBox(
width: 100,
height: 30,
child: Center(
child: ElevatedButton(
style: ElevatedButton.styleFrom(
backgroundColor: Colors.lightGreen,
minimumSize: Size.fromHeight(40), //
),
onPressed: () {
_incrementCounter();
},
child: Text(
'Count',
style: TextStyle(color: themeli[themei]),
),
)),
),
),
Card(
child: SizedBox(
width: 100,
height: 30,
child: Center(
child: Text("$Thkr_count left",
style: TextStyle(
backgroundColor: Colors.white12,
))),
),
),
],
)
]));
}
}

Flutter - How can I make these Containers to work like a Button?

This is my first App and my first steps in programming. I started with designing the Homepage. Now I want the Containers to act like Buttons, so that I can navigate to other pages. I just can't figure out a way to do so. Maybe u guys got some ideas.
Do i have to delete the 5 Containers and add 5 buttons and redesign them?
I Think there might be a problem since I wrote the buttons as widget?
The Code so far:
//import 'dart:html';
import 'package:apptierpark/Anfahrt.dart';
import 'package:flutter/material.dart';
void main () => runApp(MaterialApp(home: Tierpark()));
class Tierpark extends StatelessWidget {
get assets => null;
get image => null;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: PreferredSize(
preferredSize: Size.fromHeight(60.0),
child: AppBar(
title: Text('Tierpark Marzahne',
style: TextStyle (
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 45,
fontFamily: 'Amatic',
shadows: [
Shadow(
blurRadius: 10.0,
color: Colors.white,
offset: Offset(5.0, 5.0),
)
]
)),
flexibleSpace: Image(
image: AssetImage('images/urwald4.jpg'),
fit: BoxFit.fill,
),
backgroundColor: Colors.transparent,
),
),
body: Container(
decoration: BoxDecoration(
image: DecorationImage(image: AssetImage('images/bamboo.jpg'), fit: BoxFit.fill)),
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children:
<Widget>[
MenuButton2('Bewohner',),
SizedBox(height: 50),
MenuButton2('Parkplan'),
SizedBox(height: 40),
MenuButton2('Zeiten & Preise'),
SizedBox(height: 40),
MenuButton2('Anfahrt'),
SizedBox(height: 40),
MenuButton2 ('Über Uns')
]
,)
,)
)
);
}
}
//Button Mainpage Neu
class MenuButton2 extends StatelessWidget {
final String title;
const MenuButton2(this.title);
#override
Widget build(BuildContext context) {
return Container(
decoration: BoxDecoration(
color: const Color(0xFFa9d470),
border: Border.all(
color: const Color(0xFFa9d470)
),
borderRadius: BorderRadius.all(Radius.circular(20)),
boxShadow: [
BoxShadow(
color: Colors.black.withOpacity(0.9),
spreadRadius: 10,
blurRadius: 12
)
]
),
width: MediaQuery.of(context).size.height*0.38,
height: MediaQuery.of(context).size.height*0.11,
child: Align(
alignment: Alignment.center,
child: Text (title,
style: TextStyle(
fontSize: 50,
fontFamily: 'Amatic',
fontWeight: FontWeight.bold
),))
);
}
}
Wrap the Container with GestureDetector or InkWell like this and call functions with it's properties,
class MenuButton2 extends StatelessWidget {
final String title;
final int buttonId;
const MenuButton2(this.title,this.buttonId);
#override
Widget build(BuildContext context) {
return InkWell(
onTap: () {
if(buttonId == 1){
// do 1
}
else if(buttonId == 2){
// do 2
}
else if(buttonId == 3){
// do 3
}
else if(buttonId == 4){
// do 4
}
else {
// do 5
}
},
child:Container(
decoration: BoxDecoration(
color: const Color(0xFFa9d470),
border: Border.all(
color: const Color(0xFFa9d470)
),
borderRadius: BorderRadius.all(Radius.circular(20)),
boxShadow: [
BoxShadow(
color: Colors.black.withOpacity(0.9),
spreadRadius: 10,
blurRadius: 12
)
]
),
width: MediaQuery.of(context).size.height*0.38,
height: MediaQuery.of(context).size.height*0.11,
child: Align(
alignment: Alignment.center,
child: Text (title,
style: TextStyle(
fontSize: 50,
fontFamily: 'Amatic',
fontWeight: FontWeight.bold
),
),
),
);
}
And in the place where you call the function do this,
...
<Widget>[
MenuButton2('Bewohner', 1),
SizedBox(height: 50),
MenuButton2('Parkplan', 2),
SizedBox(height: 40),
MenuButton2('Zeiten & Preise', 3),
SizedBox(height: 40),
MenuButton2('Anfahrt', 4),
SizedBox(height: 40),
MenuButton2 ('Über Uns', 5)
],
...
Add your Container inside Inkwell or GestureDetector Widgtes refer below code hope its help to you.
Inkwell Widget
GestureDetector Widgets
// GestureDetector( you use GestureDetector also here instead of InkWell Widgets
InkWell(
onTap: () {
print('button Pressed');
// Call your onPressed or onTap function here
},
child: Container(
alignment: Alignment.center,
decoration: BoxDecoration(
color: Colors.blue,
borderRadius: BorderRadius.all(
Radius.circular(30),
),
),
height: 50,
width: 200,
child: Text(
'Search',
style: TextStyle(
color: Colors.white,
fontSize: 20,
),
),
),
),
Your result screen ->

Flutter : Use function from another file in widget

I'm using flutter and i'm completely a newbie with this framework. I'm trying to use the visibility widget to show and hide a Row.
I'm trying to use this widget when I declare the variable bool _isVisible = false in a stateful or stateless widget, but I have a problem when I want to show and hide the row() through a widget from another dart file. I don't know how to do it. To solve this problem i'm trying to create a dart file for create a function and variable bool _isVisible = false; so that all widgets can access but I am unable to use the bool variable and the function of this dart file in my widgets.
in this picture: ontap in the green circle i want the pink color all the row() with the rating and the button to be hidden.
A screenshot of the issue from my application
P.S: sorry for my english
This is the widget( AnimeMovieDialog ) with the rating section that i want to be hidden (or show) when user tap on the CardAnimeMovie widget.
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Tutorial by Woolha.com',
home: AnimeMovieDialog(),
debugShowCheckedModeBanner: false,
);
}
}
class AnimeMovieDialog extends StatefulWidget {
#override
_AnimeMovieDialogState createState() => _AnimeMovieDialogState();
}
class _AnimeMovieDialogState extends State<AnimeMovieDialog> {
double _rating = 1;
double count = 1;
bool _isVisible = true;
void _change() {
setState(() {
_isVisible = !_isVisible;
print("tap succes");
});
}
void _close() {
setState(() {
_isVisible = false;
});
}
#override
Widget build(BuildContext context) {
double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;
return SafeArea(
child: Visibility(
visible: _isVisible,
child: Stack(children: [
Container(
width: width,
height: height,
decoration: BoxDecoration(color: Color(0xffffff).withOpacity(0.6)),
),
Center(
child: SingleChildScrollView(
child: Container(
width: width / 1.05,
height: height / 1.2,
decoration: BoxDecoration(color: Color(0xff212529)),
child: Column(
children: [
Row(
children: [
Container(
width: width / 1.05,
height: 60,
decoration: BoxDecoration(color: Color(0xff212529)),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Padding(
padding:
const EdgeInsets.fromLTRB(4.0, 5, 35, 0),
child: GestureDetector(
onTap: () {
_close();
},
child: Container(
width: 65,
height: 45,
color: Colors.blue,
child: Icon(Icons.clear,
color: Colors.white)),
),
),
Container(
width: width / 2,
height: height / 2,
child: TextField(
cursorColor: Colors.orange,
style: TextStyle(
color: Colors.white,
),
maxLines: 1,
decoration: InputDecoration(
enabledBorder: UnderlineInputBorder(
borderSide: BorderSide(
color: Colors.white)),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(
color: Colors.orange)),
border: UnderlineInputBorder(
borderSide: BorderSide(
color: Colors.white)),
hintText: 'Rechercher',
hintStyle:
TextStyle(color: Colors.white),
)),
),
Padding(
padding:
const EdgeInsets.fromLTRB(15, 0, 8, 0),
child: Container(
child: Icon(Icons.search,
color: Colors.white)),
)
],
),
)
],
),
Row(
children: [
Container(
width: width / 1.05,
height: height / 1.5,
child: ListView(
children: [
CardAnimeMovie(),
CardAnimeMovie(),
CardAnimeMovie(),
CardAnimeMovie(),
CardAnimeMovie(),
CardAnimeMovie()
],
),
)
],
),
Row(children: [
Column(
children: [
Container(
width: width / 2,
height: height / 11.25,
color: null,
child: Row(
children: [
Padding(
padding: const EdgeInsets.fromLTRB(
25, 0, 0, 0),
child: GFRating(
onChanged: (value) {
setState(() {
_rating = value;
});
},
value: _rating,
size: 25,
color: Colors.orange,
borderColor: Colors.orange,
),
)
],
)),
],
),
Padding(
padding: const EdgeInsets.fromLTRB(35, 0, 8, 0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Container(
width: width / 3,
height: height / 18,
decoration: BoxDecoration(
color: Colors.orange,
borderRadius: BorderRadius.only(
topLeft: Radius.circular(25.0),
topRight: Radius.circular(25.0),
bottomLeft: Radius.circular(25.0),
bottomRight: Radius.circular(25.0))),
child: TextButton(
style: TextButton.styleFrom(
primary: Colors.blue,
onSurface: Colors.red,
),
onPressed: null,
child: Text('Noter',
style: TextStyle(
color: Colors.white,
fontFamily: 'DBIcons',
fontSize: 17)),
),
),
],
),
)
])
],
)),
),
),
]),
),
);
}
}
This is the movie resume (green in the picture)
class CardAnimeMovie extends StatefulWidget {
#override
_CardAnimeMovieState createState() => _CardAnimeMovieState();
}
class _CardAnimeMovieState extends State<CardAnimeMovie> {
// bool _visible = false;
// void ratechange() {
// setState(() {
// _visible = !_visible;
// });
// }
#override
Widget build(BuildContext context) {
double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;
return Padding(
padding: const EdgeInsets.all(2.0),
child: GestureDetector(
onTap: () {
ratechange();
},
child: Container(
width: width / 5,
height: height / 3.2,
decoration: BoxDecoration(color: Color(0xff272824)),
child: Row(
children: [
Column(children: [
Container(
width: width / 2.1,
height: height / 3.2,
child: Image.network(
'https://image.noelshack.com/fichiers/2014/31/1406628082-btlbdfqiyaasamj.jpg',
fit: BoxFit.cover,
),
)
]),
Column(children: [
Container(
width: width / 2.15,
height: height / 3.2,
decoration: BoxDecoration(
border: Border(
bottom: BorderSide(color: Colors.white, width: 0.5),
),
),
child: Padding(
padding: const EdgeInsets.fromLTRB(15, 5, 0, 0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisAlignment: MainAxisAlignment.start,
children: [
Row(
children: [
Text(
'Titre : oeuvre',
style: TextStyle(
color: Colors.white,
fontFamily: 'DBIcons',
fontSize: 18,
),
)
],
),
SizedBox(
height: 0.5,
),
Row(
children: [
Text(
'Auteur : XXXX',
style: TextStyle(
color: Colors.white,
fontFamily: 'DBIcons',
fontSize: 18,
),
)
],
),
SizedBox(height: 7),
Row(
children: [
Container(
width: width / 2.5,
height: height / 5,
child: Text(
"Résume : Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries,",
style: TextStyle(
color: Colors.white,
fontFamily: 'DBIcons',
fontSize: 18,
),
),
)
],
)
],
),
),
)
])
],
)),
),
);
}
}
You can give function to another dart file and with this you can invoke function in another dart file.
For example:
class AnotherWidget extends StatelessWidget{
final Function myFunction;
AnotherWidget ({this.myFunction});
#override
Widget build(BuildContext context) {
return FlatButton(onPressed: myFunction,....);
}

trying to add to bag and to update prices and cups

I am trying to do this test TODOs: but i have been have issuses pls help: i am trying to Uncomment the _confirmOrderModalBottomSheet() method to show summary of order, Uncomment the setState() function to clear the price and cups, and Change the 'price' to 0 when this button is clicked Increment the _cupsCounter when 'Add to Bag' button is clicked, and to Call setState((){}) method to update both price and cups counter when 'Add to Bag' button is clicked
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: 'Coffee Test',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primaryColor: Colors.white,
),
home: MyHomePage(title: 'Coffee Test'),
);
}
}
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 _selectedPosition = -1;
String _coffeePrice ="0";
int _cupsCounter =0;
int price = 0;
String _currency ="₦";
static const String coffeeCup ="images/coffee_cup_size.png";
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
elevation: 0,
title: FlatButton(
onPressed: (){
//TODO: Uncomment the _confirmOrderModalBottomSheet() method to show summary of order
//_confirmOrderModalBottomSheet(totalPrice: "$_currency$price", numOfCups: "x $_cupsCounter");
},
child: Text("Buy Now",style: TextStyle(color: Colors.black87),),
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18.0), side: BorderSide(color: Colors.blue))
),
actions: [
InkWell(
onTap: () {
//TODO: Uncomment the setState() function to clear the price and cups
//TODO: Change the 'price' to 0 when this button is clicked
setState(() {
this.price = -1;
this._cupsCounter = 0;
});
Icon(Icons.clear);
}),
SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Container(
height: double.maxFinite,
alignment: Alignment.center,
child: Text("$_cupsCounter Cups = $_currency$price.00", style: TextStyle(fontSize: 18),),
),
)
],
),
body: Padding(padding: EdgeInsets.all(20), child: _mainBody(),) // This trailing comma makes auto-formatting nicer for build methods.
);
}
Widget _mainBody(){
return SingleChildScrollView(
child: Container(
height: double.maxFinite,
width: double.maxFinite,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Expanded(
flex: 0,
child: Stack(
children: [
Container(
width: double.maxFinite,
height: 250,
margin: EdgeInsets.only(left: 50, right: 50, bottom: 50, top: 60),
decoration: BoxDecoration(borderRadius:
BorderRadius.all(Radius.circular(180)),
color: Color.fromRGBO(239, 235, 233, 100)),
),
Container(
alignment: Alignment.center,
width: double.maxFinite,
height: 350,
child: Image.asset("images/cup_of_coffee.png", height: 300,),
)
],
)),
Padding(padding: EdgeInsets.all(10),),
Expanded(flex: 0,child: Text("Caffè Americano",
style: TextStyle(fontWeight: FontWeight.bold,
fontSize: 30),)),
Padding(padding: EdgeInsets.all(6),),
Expanded(flex: 0, child: Text("Select the cup size you want and we will deliver it to you in less than 48hours",
style: TextStyle(fontWeight: FontWeight.bold,
fontSize: 14, color: Colors.black45,),
textAlign: TextAlign.start,),
),
Container(
margin: EdgeInsets.only(top: 30, left: 20),
height: 55,
width: double.maxFinite,
alignment: Alignment.center,
child:Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
RichText(text: TextSpan(
text: _currency,
style: TextStyle(fontWeight: FontWeight.bold,
fontSize: 25, color: Colors.black87),
children: [
TextSpan(text: _coffeePrice, style: TextStyle(fontSize: 50, fontWeight: FontWeight.bold))
]
),),
Padding(
padding: EdgeInsets.only(right: 15),
),
ListView.builder(itemBuilder: (context, index){
return InkWell(
child: _coffeeSizeButton(_selectedPosition == index,
index ==0? "S" : index ==1? "M": "L"),
onTap: (){
setState(() {
this._coffeePrice= index ==0? "300" : index ==1? "600": "900";
_selectedPosition = index;
});
},
);
}, scrollDirection: Axis.horizontal,
itemCount: 3, shrinkWrap: true,),
],),
),
Container(
margin: EdgeInsets.only(top: 30),
padding: EdgeInsets.all(10),
width: double.maxFinite,
height: 70,
child: FlatButton(onPressed: (){
//TODO: Currently _cupsCounter only show 1 when this button is clicked.
// TODO: Increment the _cupsCounter when 'Add to Bag' button is clicked'
//TODO: Call setState((){}) method to update both price and cups counter when 'Add to Bag' button is clicked
this._cupsCounter = 1;
this.price += int.parse(_coffeePrice);
}, child: Center(child: Text("Add to Bag",
style: TextStyle(fontWeight: FontWeight.bold, color: Colors.white),)
,),
color: Colors.blue,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(50)
),
),
)
],
),
),
);
}
Widget _coffeeSizeButton(bool isSelected, String coffeeSize){
return Stack(
children: [
Container(alignment: Alignment.center, width: 55,
child: Text(coffeeSize, style: TextStyle(fontSize: 10, fontWeight: FontWeight.bold,
color: isSelected? Colors.blue: Colors.black45),),),
new Container(
margin: EdgeInsets.only(right: 10),
child: Image.asset(coffeeCup, width:50, color: isSelected ? Colors.blue: Colors.black45,),
decoration: BoxDecoration(border: Border(top: BorderSide(color: isSelected? Colors.blue: Colors.black45,
width: isSelected? 2: 1), left: BorderSide(color: isSelected? Colors.blue: Colors.black45,
width: isSelected? 2: 1), bottom: BorderSide(color: isSelected? Colors.blue: Colors.black45,
width: isSelected? 2: 1), right: BorderSide(color: isSelected ?Colors.blue: Colors.black45 ,
width: isSelected? 2: 1)), borderRadius: BorderRadius.all(Radius.circular(5))),
)
],
);
}
void _confirmOrderModalBottomSheet({String totalPrice, String numOfCups}){
showModalBottomSheet(
context: context,
builder: (builder){
return new Container(
height: 150.0,
color: Colors.transparent, //could change this to Color(0xFF737373),
//so you don't have to change MaterialApp canvasColor
child: new Container(
padding: EdgeInsets.all(10),
decoration: new BoxDecoration(
color: Colors.white,
borderRadius: new BorderRadius.only(
topLeft: const Radius.circular(10.0),
topRight: const Radius.circular(10.0))),
child: Column(
children: [
Container(
child: Text("Confirm Order",
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 18),),
alignment: Alignment.center, height: 30, decoration: BoxDecoration(
), ),
_getEstimate(totalPrice, numOfCups)
],
)),
);
}
);
}
Widget _getEstimate(String totalPrice, String numOfCups){
return Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Image.asset("images/cup_of_coffee.png", height: 70, width: 50,),
Padding(padding: EdgeInsets.all(10)),
Text(numOfCups, style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),),
Padding(padding: EdgeInsets.all(10)),
Text(totalPrice, style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),)
],
);
}
}
You're setting 1 to your _cupsCounter instead of adding one to it.
When updating your values, putting the operation i.e _cupsCounter += 1; in setState will update the state of your widget which makes values change in your widgets.
setState((){
_cupsCounter += 1; // make it +=1 instead of =1.
price += int.parse(_coffeePrice);
});
Also you can use setState by putting it after your operation which will update the state of your widget after the operation is done.
_cupsCounter += 1; // make it +=1 instead of =1.
price += int.parse(_coffeePrice);
setState((){});
Full code should look like this.
Container(
margin: EdgeInsets.only(top: 30),
padding: EdgeInsets.all(10),
width: double.maxFinite,
height: 70,
child: FlatButton(onPressed: (){
// Currently _cupsCounter only show 1 when this button is clicked.
// Increment the _cupsCounter when 'Add to Bag' button is clicked'
// Call setState((){}) method to update both price and cups counter when 'Add to Bag' button is clicked
setState((){
_cupsCounter += 1; // make it +=1 instead of =1.
price += int.parse(_coffeePrice);
}); // call setState like this
}, child: Center(child: Text("Add to Bag",
style: TextStyle(fontWeight: FontWeight.bold, color: Colors.white),)
,),
color: Colors.blue,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(50)
),
),
)