当我点击“个人资料”图标时发生
这是控制台的整个错误：
这是我的代码：
GestureDetector(
behavior: HitTestBehavior.translucent,
onTapDown: (details) {
tapOffset = details.globalPosition;
},
child: IconButton(
onPressed: () {
showMenu(
position: RelativeRect.fromLTRB(
tapOffset!.dx -
150, // assuming popUp width, can be controll by bottom `constraints` providing same width on min and max
64,
tapOffset?.dx ?? 0,
0,
),
constraints: const BoxConstraints(
maxWidth: 600,
),
context: context,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10)),
items: [
PopupMenuItem(
child: ListTile(
title: Text(
'Log in',
style: GoogleFonts.nunito(
color: const Color(0xff3B3B3B),
fontSize: 16.0,
fontWeight: FontWeight.w500,
),
),
trailing: const Icon(
Icons.login_outlined,
color: Color(0xff3B3B3B),
size: 20,
semanticLabel: 'Pomodoro timer Log in',
),
contentPadding: EdgeInsets.zero,
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
const Profile()),
);
},
),
),
PopupMenuItem(
child: ListTile(
title: Text(
'Log out',
style: GoogleFonts.nunito(
color: const Color(0xff3B3B3B),
fontSize: 16.0,
fontWeight: FontWeight.w500,
),
),
trailing: const Icon(
Icons.logout_outlined,
color: Color(0xff3B3B3B),
size: 20,
semanticLabel: 'Pomodoro timer Log out',
),
contentPadding: EdgeInsets.zero,
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
const Text('Log out')),
);
},
),
),
PopupMenuItem(
child: ResponsiveWeb(
child: ListTile(
title: Text(
'Go premium',
style: GoogleFonts.nunito(
color: const Color(0xff3B3B3B),
fontSize: 16.0,
fontWeight: FontWeight.w500,
),
),
// ignore: prefer_const_constructors
trailing: Icon(
Icons.landscape_outlined,
color: const Color(0xff3B3B3B),
size: 20,
semanticLabel:
'Pomodoro timer premium feature',
),
contentPadding: EdgeInsets.zero,
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
const HomeScreenStripe()),
);
},
),
),
),
PopupMenuItem(
child: ListTile(
title: Text(
'Delete account',
style: GoogleFonts.nunito(
color: const Color(0xff3B3B3B),
fontSize: 16.0,
fontWeight: FontWeight.w500,
),
),
trailing: const Icon(
Icons.delete_forever_outlined,
color: Color(0xff3B3B3B),
size: 20,
semanticLabel:
'Pomodoro timer Delete account',
),
contentPadding: EdgeInsets.zero,
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
const Text('Delete account')),
);
},
),
),
]);
},
icon: Tooltip(
message: 'Profile',
child: Semantics(
label: 'Pomodoro timer More',
enabled: true,
readOnly: true,
child: const Icon(
Icons.account_circle_outlined,
color: Color(0xff3B3B3B),
size: 24,
semanticLabel: 'Pomodoro timer Profile',
),
),
),
),
),
我如何解决这个问题？
谢谢你能提供的任何帮助
您在ttOffset中使用了空检查（！）。看起来在那一刻，ttOffset是null。您可以使用？运算符而不是！，并定义一个默认值（就像您在下面的行中所做的那样）
position: RelativeRect.fromLTRB(
tapOffset!.dx -
150, // here is the problem
64,
tapOffset?.dx ?? 0,
0,
),
