【发布时间】：2022-01-06 04:44:00
【问题描述】：
我有产品清单。在将它们添加到购物车时，我正在执行 setstate 并使用购物车中的物品数量更新 ui。在执行 setstate 时，我的列表视图将排在第一位。我希望它位于我将商品添加到购物车的相同滚动位置上？知道怎么做吗？`
getCart() async {
Result response = await authService.fetchCart();
loading = true;
if (response is SuccessState) {
if (response.value['status'] == true) {
List tempCart = [];
for (var i = 0; i < response.value['data'].length; i++) {
if (response.value['data'][i]['type'] == 'Products') {
tempCart = response.value['data'][i]['data'];
}
}
loading = false;
setState(() {
cart = tempCart;
});
} else {
loading = false;
}
} else {
loading = false;
showDialog(
context: context,
builder: (context) {
return AlertDialog(
title: Center(
child: Text('Server error please try after some time!!!')),
actions: <Widget>[
Center(
child: InkWell(
onTap: () {
Navigator.pop(context);
},
child: Container(
decoration: BoxDecoration(
color: AppColors.primaryColor,
borderRadius: BorderRadius.all(
Radius.circular(20.0),
)),
margin:
EdgeInsets.symmetric(horizontal: 0, vertical: 20),
child: Padding(
padding: EdgeInsets.only(
left: 40, right: 40, top: 10, bottom: 10),
child: Text('Ok',
style: TextStyle(
fontWeight: FontWeight.w400,
fontSize: AppStyles.SMALL_TEXTSIZE,
color: Colors.white),
textAlign: TextAlign.center),
)),
),
),
],
);
});
}
}`
ListView.builder(
key: PageStorageKey(_globalCounter),
physics: NeverScrollableScrollPhysics(),
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: products.length,
itemBuilder: (context, i) {
if (products.length > 0 &&
i == products.length - 1 &&
page < total_pages) {
print('index equal to length');
loading = true;
return _buildProgressIndicator();
} else {
return GestureDetector(
onTap: () {
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => ProductDetail(
id: products[i]['id'].toString()),
),
);
},
child: Container(
decoration: BoxDecoration(
border: Border.all(
color: Colors.grey[100], width: 1),
borderRadius: BorderRadius.all(
Radius.circular(10.0),
),
),
child: Padding(
padding: EdgeInsets.only(
top: 25,
bottom: 10,
left: 0,
right: 0),
child: Row(
children: [
Expanded(
child: Container(
child:
// Image.network(
// products[i]['image'] !=
// null
// ? products[i]
// ['image']
// : '')
CachedNetworkImage(
imageUrl: products[i]['image'],
placeholder: (context, url) => Align(
alignment: Alignment.center,
child: Loader(),
),
errorWidget: (context, url, error) => Icon(Icons.error),
),
)),
Expanded(
flex: 2,
child: Column(
children: [
Padding(
padding:
EdgeInsets.only(
top: 5,
bottom: 5,
left: 10,
right: 5),
child: Text(
products[i][
'generic_name'],
style: TextStyle(
fontWeight:
FontWeight
.w500,
fontSize:
AppStyles
.SMALL_TEXTSIZE))),
Padding(
padding:
EdgeInsets.only(
top: 2,
bottom: 5,
left: 10,
right: 5),
child: Container(
width: double
.infinity,
child: Wrap(
children: [
Text('MRP ',
style: TextStyle(
fontWeight: FontWeight
.w500,
fontSize: AppStyles
.SMALL_TEXTSIZE,
color: Colors
.deepOrangeAccent,
decoration:
TextDecoration.lineThrough)),
Text(
'Rs. ${products[i]['mrp_amount']} ',
style: TextStyle(
fontWeight: FontWeight
.w500,
fontSize: AppStyles
.SMALL_TEXTSIZE,
color: Colors
.deepOrangeAccent,
decoration:
TextDecoration.lineThrough)),
Text(
' Rs. ${products[i]['chemist_amount']}',
style: TextStyle(
fontWeight: FontWeight
.w500,
fontSize: AppStyles
.SMALL_TEXTSIZE,
color:
Colors.lightGreen))
],
))),
Padding(
padding:
EdgeInsets.only(
top: 2,
bottom: 5,
left: 10,
right: 5),
child: Row(
children: [
Expanded(
child:
Container(
width: double
.infinity,
child: Text(
('${products[i]['package']}' !=
null)
? '${products[i]['package']}'
: '',
style: TextStyle(
fontWeight:
FontWeight
.w500,
fontSize:
AppStyles
.SMALL_TEXTSIZE,
color: Colors
.grey)),
)),
],
)),
if (products[i] != null &&
isProductExistInCart(
products[i]
['id']) !=
null)
Row(
children: [
Expanded(
child: Row(
children: [
Expanded(
flex: 1,
child: Container(
width: double.infinity,
child: RawMaterialButton(
onPressed:
() {
addItemToCart(products[i]['id'],
'remove');
},
elevation:
2.0,
fillColor:
Colors.white,
child: Text(
'-',
style: TextStyle(fontSize: AppStyles.SMALL_TEXTSIZE, fontWeight: FontWeight.bold)),
padding:
EdgeInsets.all(1.0),
shape:
CircleBorder(),
))),
Expanded(
flex: 1,
child: Container(
width: double
.infinity,
child: Text(
getCartCount(products[i][
'id']),
textAlign:
TextAlign.center,
style: TextStyle(fontSize: AppStyles.SMALL_TEXTSIZE, fontWeight: FontWeight.bold)))),
Expanded(
flex: 1,
child:
RawMaterialButton(
onPressed:
() {
//check Stock qty
if (isAvailableInStock(
products[
i])) {
addItemToCart(
products[i]['id'],
'add');
_globalCounter=i;
} else {
final snackBar =
SnackBar(
content: Text("This product is limited with" +
products[i]['stock_in'] +
" items"),
duration:
Duration(seconds: 2),
);
_scaffoldKey
.currentState
.showSnackBar(snackBar);
}
},
elevation:
2.0,
fillColor:
Colors
.white,
child: Text(
'+',
style: TextStyle(
fontSize:
AppStyles.SMALL_TEXTSIZE,
fontWeight: FontWeight.bold)),
padding:
EdgeInsets.all(
1.0),
shape:
CircleBorder(),
),
),
Expanded(
child:
Container())
],
)),
],
),
getBuyNowButton(
products[i])
],
))
],
))));
}
},
)
【问题讨论】：
标签： flutter