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import 'package:flutter/material.dart';
import 'package:flutter_constraintlayout/flutter_constraintlayout.dart';
class ConstraintLayoutPage extends StatefulWidget {
const ConstraintLayoutPage({Key? key}) : super(key: key);
@override
State<ConstraintLayoutPage> createState() => _ConstraintLayoutPageState();
}
class _ConstraintLayoutPageState extends State<ConstraintLayoutPage> {
final ConstraintId appLogoId = ConstraintId('appLogoId');
final ConstraintId appTitleId = ConstraintId('appTitleId');
final ConstraintId appAccountId = ConstraintId('appAccountId');
final ConstraintId passwordId = ConstraintId('passwordId');
final ConstraintId loginId = ConstraintId('loginId');
final ConstraintId registId = ConstraintId('registId');
final ConstraintId otherId = ConstraintId('otherId');
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('ConstraintLayout'),
),
body: ConstraintLayout(
children: <Widget>[
_buildAppLogo(),
_buildAppTitle(),
_buildInputContainer(
id: appAccountId,
topConstraint: appTitleId.bottom.margin(40),
hintText: '请输入账户名',
icon: Icons.person,
),
_buildInputContainer(
id: passwordId,
topConstraint: appAccountId.bottom.margin(20),
hintText: '请输入密码',
icon: Icons.password,
),
_buildElevatedButton(
id: loginId,
topConstraint: passwordId.bottom.margin(70),
buttonText: '登陆',
backgroundColor: const Color(0xff5B70CF),
),
_buildElevatedButton(
id: registId,
topConstraint: loginId.bottom.margin(30),
buttonText: '注册',
backgroundColor: const Color(0xffF8644E),
),
_buildTextWithConstraints(
id: otherId,
text: '其他方式登录',
topConstraint: registId.bottom.margin(60),
centerHorizontalTo: parent,
),
_buildSocialLoginRow(),
],
),
);
// // AppBar
}
// 构建logo
Widget _buildAppLogo() {
return Image.asset(
'assets/images/login/app_logo.png',
width: 120,
).applyConstraint(
top: parent.top.margin(60),
left: parent.left.margin(20),
right: parent.right.margin(20),
id: appLogoId,
);
}
// 构建app的名称
Widget _buildAppTitle() {
return const Text(
"APP Name",
style: TextStyle(fontSize: 20, color: Color(0xFFBECEFA)),
).applyConstraint(
id: appTitleId,
top: appLogoId.bottom.margin(10),
left: parent.left,
right: parent.right,
);
}
// 构建输入框:账号/密码
Widget _buildInputContainer({
required ConstraintId id,
required ConstraintAlign topConstraint,
required String hintText,
required IconData icon,
}) {
return Container(
color: const Color(0xFFF0F5FD),
child: Row(
children: [
const SizedBox(width: 10),
Icon(icon),
const SizedBox(width: 20),
Expanded(
child: TextField(
style: const TextStyle(
color: Color(0xffA0ACD4),
fontSize: 20,
),
decoration: InputDecoration(
border: InputBorder.none,
hintText: hintText,
hintStyle: const TextStyle(color: Color(0xffA0ACD4)),
labelStyle: const TextStyle(color: Color(0xffA0ACD4)),
),
),
),
],
),
).applyConstraint(
id: id,
width: matchConstraint,
height: 60,
top: topConstraint,
left: parent.left.margin(20),
right: parent.right.margin(20),
);
}
// 构建登陆/注册
Widget _buildElevatedButton({
required ConstraintId id,
required ConstraintAlign topConstraint,
required String buttonText,
required Color backgroundColor,
}) {
return ElevatedButton(
onPressed: () {
debugPrint('点击了按钮:$buttonText');
},
style: ButtonStyle(
backgroundColor: MaterialStateProperty.all(backgroundColor),
),
child: Text(
buttonText,
style: const TextStyle(
fontSize: 20,
color: Colors.white,
),
),
).applyConstraint(
id: id,
top: topConstraint,
width: matchConstraint,
height: 60,
left: parent.left.margin(120),
right: parent.right.margin(120),
);
}
// 构造说明文本
Widget _buildTextWithConstraints({
required ConstraintId id,
required String text,
required ConstraintAlign topConstraint,
required ConstraintId centerHorizontalTo,
}) {
return Text(
text,
style: const TextStyle(
fontSize: 16,
color: Color(0xFFD5DFF2),
),
).applyConstraint(
id: id,
left: parent.left,
right: parent.right,
top: topConstraint,
centerHorizontalTo: centerHorizontalTo,
);
}
// 构建其它登录方式：微信，QQ，微博
Widget _buildSocialLoginRow() {
return Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
GestureDetector(
onTap: () {
debugPrint('点击了微信登录');
},
child: Image.asset(
'assets/images/login/wechat.png',
width: 40,
height: 40,
),
),
const SizedBox(width: 20),
InkWell(
onTap: () {
debugPrint('点击了QQ登录');
},
child: Image.asset(
'assets/images/login/qq.png',
width: 40,
height: 40,
),
),
const SizedBox(width: 20),
InkWell(
onTap: () {
debugPrint('点击了微博登录');
},
child: Image.asset(
'assets/images/login/weibo.png',
width: 40,
height: 40,
),
),
],
).applyConstraint(
width: matchParent,
top: otherId.bottom.margin(20),
);
}
}
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