//----- I am trying to refresh UI when product quantity increases or decreases in Hive DB-----//
//---------------My HIVE Class--------------------------//
@HiveType(typeId: 0)
class ProductDBModel extends HiveObject{
@HiveField(0)
int id;
@HiveField(1)
String productName;
@HiveField(2)
String image;
@HiveField(3)
int price;
@HiveField(4)
String description;
@HiveField(5)
int quantity;
ProductDBModel(this.id, this.productName, this.image, this.price, this.description, this.quantity);
}
//-------------------My Cart Class I am using stream builder---------------------------//
class CartScreen extends StatefulWidget {
@override
_CartScreenState createState() => _CartScreenState();
}
class _CartScreenState extends State<CartScreen> {
Future<List> stream;
@override
void initState() {
super.initState();
stream = _openBoxgetList();
}
Future<List<ProductDBModel>> _openBoxgetList() async {
Box hive_prod_box = await Hive.openBox<ProductDBModel>(ProductTable);
List rawFavouriteList = await hive_prod_box.values.toList();
return rawFavouriteList;
}
@override
Widget build(BuildContext context) {
return StreamBuilder<List<ProductDBModel>>(
stream: stream.asStream(),
builder: (context, AsyncSnapshot snapshot) {
if (!snapshot.hasData) {
return Container(child: Center(child: CircularProgressIndicator()));
}
else if(snapshot.hasError){
return Scaffold(body: Text('Error Occured while loading cart'),);
}
else
{
if(snapshot.data.length == 0){
Hive.deleteFromDisk();
return ShowEmptyCart();
}
else{
return
Scaffold(
body: Padding(
padding: const EdgeInsets.symmetric(horizontal: 8.0),
child: ListView.builder(
physics: ScrollPhysics(),
shrinkWrap: true,
itemCount: snapshot.data.length,
itemBuilder: (context, index) {
return Dismissible(
background: Container(color: Colors.red),
key: UniqueKey(),
onDismissed: (direction) {
snapshot.data[index].delete();
},
child: CartItem(snapshot.data[index], index),
);
},
),
),
);
}
}
});
}
}
//------------------cart item class to update product quantity-----------------//
class CartItem extends StatefulWidget {
ProductDBModel prod_;
int index;
CartItem(ProductDBModel this.prod_, this.index);
@override
_CartItemState createState() => _CartItemState();
}
class _CartItemState extends State<CartItem> {
CartScreen _cartScreen = new CartScreen();
@override
Widget build(BuildContext context) {
return Card(
elevation: 2,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 5.0),
child: Container(
height: 150.0,
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Padding(
padding: const EdgeInsets.only(left: 10.0),
Container(
decoration: BoxDecoration(
color: grey_background,
borderRadius: BorderRadius.circular(12),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
InkWell(
child: Padding(
padding: const EdgeInsets.fromLTRB(8.0, 5.0, 8.0, 5.0),
child: TextOnlyFont14(
'-', Colors.black, FontWeight.w600),
),
onTap: () {
CheckUpdate(widget.prod_, widget.index, "dec", context);
},
),
TextOnlyFont14(widget.prod_.quantity.toString(),
Colors.black, FontWeight.w600),
InkWell(
child: Padding(
padding: const EdgeInsets.fromLTRB(8.0, 5.0, 8.0, 5.0),
child: TextOnlyFont14(
'+', Colors.black, FontWeight.w600),
),
onTap: () {
CheckUpdate(widget.prod_, widget.index, "inc", context);
},
),
],
),
),
),
],
),
),
),
);
}
Future<void> CheckUpdate(ProductDBModel product, int index_, String inc_dec,
BuildContext context) async {
Box prodBox = await Hive.openBox<ProductDBModel>(ProductTable);
final modelExists = prodBox.containsKey(product.key);
if (!modelExists) {
product.quantity = 1;
await prodBox.add(product);
} else {
if (equalsIgnoreCase(inc_dec, "inc")) {
product.quantity += 1;
} else if(equalsIgnoreCase(inc_dec, "dec")) {
if (product.quantity == 1) {
} else {
product.quantity -= 1;
}
}
else if(equalsIgnoreCase(inc_dec, "del")) {
product.delete();
}
product.save();
}
}
}
