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}
}<code_end>
The CustomerCart widget displays the customer’s photo,
name, total, and item count based on a Customer instance.To update a customer’s cart when a menu item is dropped,
add the dropped item to the associated Customer object.
<code_start>void _itemDroppedOnCustomerCart({
required Item item,
required Customer customer,
}) {
setState(() {
customer.items.add(item);
});
}<code_end>
The _itemDroppedOnCustomerCart method is invoked in
onAcceptWithDetails() when the user drops a menu item on a
CustomerCart widget. By adding the dropped item to the
customer object, and invoking setState() to cause a
layout update, the UI refreshes with the new customer’s
price total and item count.Congratulations! You have a drag-and-drop interaction
that adds food items to a customer’s shopping cart.<topic_end>
<topic_start>
Interactive example
Run the app:
<code_start>import 'package:flutter/material.dart';
void main() {
runApp(
const MaterialApp(
home: ExampleDragAndDrop(),
debugShowCheckedModeBanner: false,
),
);
}
const List<Item> _items = [
Item(
name: 'Spinach Pizza',
totalPriceCents: 1299,
uid: '1',
imageProvider: NetworkImage('https://flutter'
'.dev/docs/cookbook/img-files/effects/split-check/Food1.jpg'),
),
Item(
name: 'Veggie Delight',
totalPriceCents: 799,
uid: '2',
imageProvider: NetworkImage('https://flutter'
'.dev/docs/cookbook/img-files/effects/split-check/Food2.jpg'),
),
Item(
name: 'Chicken Parmesan',
totalPriceCents: 1499,
uid: '3',
imageProvider: NetworkImage('https://flutter'
'.dev/docs/cookbook/img-files/effects/split-check/Food3.jpg'),
),
];
@immutable
class ExampleDragAndDrop extends StatefulWidget {
const ExampleDragAndDrop({super.key});
@override
State<ExampleDragAndDrop> createState() => _ExampleDragAndDropState();
}
class _ExampleDragAndDropState extends State<ExampleDragAndDrop>
with TickerProviderStateMixin {
final List<Customer> _people = [
Customer(
name: 'Makayla',
imageProvider: const NetworkImage('https://flutter'
'.dev/docs/cookbook/img-files/effects/split-check/Avatar1.jpg'),
),
Customer(
name: 'Nathan',
imageProvider: const NetworkImage('https://flutter'
'.dev/docs/cookbook/img-files/effects/split-check/Avatar2.jpg'),
),
Customer(
name: 'Emilio',
imageProvider: const NetworkImage('https://flutter'
'.dev/docs/cookbook/img-files/effects/split-check/Avatar3.jpg'),
),
];
final GlobalKey _draggableKey = GlobalKey();
void _itemDroppedOnCustomerCart({
required Item item,
required Customer customer,
}) {
setState(() {
customer.items.add(item);
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: const Color(0xFFF7F7F7),
appBar: _buildAppBar(),
body: _buildContent(),
);
}
PreferredSizeWidget _buildAppBar() {
return AppBar(
iconTheme: const IconThemeData(color: Color(0xFFF64209)),