【发布时间】：2021-01-05 07:46:06
【问题描述】：
我正在构建一个购物车 UI，我想在其中显示我的购物车商品列表以及一个固定的底部小部件，该小部件将显示购物车摘要详细信息。
我希望购物车摘要容器固定在底部，并且 ListView.builder 可滚动，但要位于底部小部件的正上方，而不是消失在其中。
这是我的代码。我知道这一定是我忽略的东西。我需要这方面的帮助。
谢谢。
class CheckoutScreen extends StatelessWidget {
static const String id = 'checkout_screen';
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: IconButton(
icon: Icon(
Icons.arrow_back_ios,
color: Colors.black26,
),
onPressed: () => Navigator.pop(context),
),
title: Text(
'Shopping cart',
style: TextStyle(
fontSize: 21.0,
color: Colors.black26,
fontWeight: FontWeight.bold,
),
),
elevation: 0.0,
backgroundColor: Colors.white,
),
// bottomNavigationBar: _buildCartSummary(context),
body: Stack(
children: <Widget>[
Container(
padding: const EdgeInsets.symmetric(horizontal: 16.0),
child: ListView.builder(
itemCount: 5,
itemBuilder: (context, index) {
return _buildCartItems();
},
),
),
SizedBox(height: 30),
Container(
child: Align(
alignment: Alignment.bottomCenter,
child: _buildCartSummary(context),
),
),
],
),
// Align(
// alignment: Alignment.center,
// child: Text('Your cart is empty.')),
);
}
_buildCartItems() {
return Container(
color: Colors.white,
margin: EdgeInsets.symmetric(vertical: 6.0),
child: Row(
children: <Widget>[
Expanded(
child: Container(
width: 80.0,
height: 80.0,
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.circular(20.0),
),
child: Center(
child: Container(
padding: EdgeInsets.all(4.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20.0),
image: DecorationImage(
fit: BoxFit.cover,
image: NetworkImage(
'https://s2.r29static.com/bin/entry/ebd/0,675,2000,1050/x,80/1929471/image.jpg'),
),
),
),
),
),
),
SizedBox(width: 12.0),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Container(
width: 100.0,
child: Text(
'Nike Air max',
style: TextStyle(fontWeight: FontWeight.bold),
),
),
SizedBox(height: 8.0),
Row(
children: <Widget>[
Container(
width: 20.0,
height: 20.0,
decoration: BoxDecoration(
color: Colors.grey[200],
borderRadius: BorderRadiusDirectional.circular(4.0),
),
child: Icon(
Icons.remove,
color: Colors.white,
size: 15.0,
),
),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 15.0),
child: Text(
'1',
style: TextStyle(
fontWeight: FontWeight.bold, fontSize: 15.0),
),
),
Container(
width: 20.0,
height: 20.0,
decoration: BoxDecoration(
color: kThemeStyleButtonFillColour,
borderRadius: BorderRadiusDirectional.circular(4.0),
),
child: Icon(
Icons.add,
color: Colors.white,
size: 15.0,
),
),
],
),
],
),
),
Spacer(),
Expanded(
child: Text(
'\u20b9 6,000',
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 15.0),
),
),
],
),
);
}
_buildCartSummary(BuildContext context) {
return Container(
padding: EdgeInsets.fromLTRB(15.0, 8.0, 15.0, 0.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Divider(),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Sub Total',
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 15.0),
),
Text(
'\u20b9 480',
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 15.0),
),
],
),
SizedBox(height: 10.0),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Taxes (absorbed by you)',
style: TextStyle(fontSize: 15.0),
),
Text(
'\u20b9 40',
style: TextStyle(fontSize: 15.0),
),
],
),
SizedBox(height: 10.0),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
'Total',
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),
),
Text(
'\u20b9 520',
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 15.0),
),
],
),
MaterialButton(
onPressed: () {
showModalBottomSheet(
context: context,
isScrollControlled: true,
builder: (context) => SingleChildScrollView(
child: Container(
padding: EdgeInsets.only(
bottom: MediaQuery.of(context).viewInsets.bottom),
child: ShowPaymentOptionsScreen(),
),
),
);
},
height: 40.0,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(5.0),
),
minWidth: double.infinity,
child: Text(
'PROCESS PAYMENT',
style: TextStyle(
color: Colors.white,
fontSize: 14.0,
fontWeight: FontWeight.bold,
),
),
color: kThemeStyleButtonFillColour,
),
SizedBox(height: 15.0),
],
),
);
}
}
【问题讨论】：
标签： flutter listview flutter-layout