Flutter 带有可配置动作按钮的颤振通用appBar
我不熟悉flifter,有一个公共appBar,与main.dart分离,因此我可以在每个屏幕上使用它。这里是带appBar的dart文件Flutter 带有可配置动作按钮的颤振通用appBar,flutter,flutter-appbar,Flutter,Flutter Appbar,我不熟悉flifter,有一个公共appBar,与main.dart分离,因此我可以在每个屏幕上使用它。这里是带appBar的dart文件 import 'package:flutter/material.dart'; import 'package:voota/utils/Hex2Color.dart'; import 'package:intl/intl.dart'; class BaseAppBar extends StatelessWidget implements Preferred
import 'package:flutter/material.dart';
import 'package:voota/utils/Hex2Color.dart';
import 'package:intl/intl.dart';
class BaseAppBar extends StatelessWidget implements PreferredSizeWidget {
final Color bgColor = HexToColor('#508bbb');
final String title;
final AppBar appBar;
final List<Widget> widgets;
BaseAppBar({Key key, this.title, this.appBar, this.widgets})
: super(key: key);
@override
Widget build(BuildContext context) {
DateTime now = DateTime.now();
String formattedDate = DateFormat('MMMM d, y').format(now);
return AppBar(
title: RichText(
text: TextSpan(
text: 'VOOTA ' + title,
style: TextStyle(
fontSize: 15.0,
color: Colors.white,
),
children: [
TextSpan(text: '\n'),
TextSpan(
text: formattedDate,
style: TextStyle(
fontSize: 10.0,
color: Colors.white,
),
),
]),
textAlign: TextAlign.center,
),
centerTitle: true,
backgroundColor: bgColor,
elevation: 0,
//actions: widgets,
);
}
@override
Size get preferredSize => new Size.fromHeight(appBar.preferredSize.height);
}
现在我需要一个行动按钮(溢出下拉菜单)在一些屏幕上。但是屏幕之间的动作是不同的。我如何定义这一点?在一个屏幕上,选择菜单中只有一个刷新,而在另一个屏幕上,有刷新、注销和具有不同路径的激活选项。在仪表板上根本没有任何动作。。。Thx提供任何帮助、建议或链接;) 解决方案1 创建多个自定义appBar 解决方案2 添加字符串类型
class BaseAppBar extends StatelessWidget implements PreferredSizeWidget {
final Color bgColor = HexToColor('#508bbb');
final String title;
final AppBar appBar;
final List<Widget> widgets;
final String type;
也可以使用枚举而不是字符串
解决方案1 创建多个自定义appBar 解决方案2 添加字符串类型
class BaseAppBar extends StatelessWidget implements PreferredSizeWidget {
final Color bgColor = HexToColor('#508bbb');
final String title;
final AppBar appBar;
final List<Widget> widgets;
final String type;
也可以使用枚举而不是字符串
我是按以下方式做的,希望这是正确的: 在我的AppBar中,我添加了一个带有DropdownChoices的类,并使用参数DropdownChoices扩展了BaseAppBar
import 'package:flutter/material.dart';
import 'package:voota/utils/Hex2Color.dart';
import 'package:intl/intl.dart';
class BaseAppBar extends StatelessWidget implements PreferredSizeWidget {
final Color bgColor = HexToColor('#508bbb');
final String title;
final AppBar appBar;
final List<Widget> widgets;
final List<DropdownChoices> dropdownChoices;
BaseAppBar({Key key, this.title, this.appBar, this.widgets, this.dropdownChoices}) : super(key: key);
@override
Widget build(BuildContext context) {
DateTime now = DateTime.now();
String formattedDate = DateFormat('MMMM d, y').format(now);
print('app bar. count dropdown choices ${dropdownChoices.length}');
return AppBar(
title: RichText(
text: TextSpan(
text: 'VOOTA ' + title,
style: TextStyle(
fontSize: 15.0,
color: Colors.white,
),
children: [
TextSpan(text: '\n'),
TextSpan(
text: formattedDate,
style: TextStyle(
fontSize: 10.0,
color: Colors.white,
),
),
]),
textAlign: TextAlign.center,
),
centerTitle: true,
backgroundColor: bgColor,
elevation: 0,
actions: <Widget>[
PopupMenuButton<DropdownChoices>(
onSelected: null,
elevation: 6,
itemBuilder: (BuildContext context) {
return dropdownChoices.map((DropdownChoices choice) {
return PopupMenuItem<DropdownChoices>(
value: choice,
child: Text(choice.title),
);
}).toList();
},
),
],
);
}
@override
Size get preferredSize => new Size.fromHeight(appBar.preferredSize.height);
}
class DropdownChoices {
const DropdownChoices({this.title, this.icon});
final String title;
final IconData icon;
}
导入“包装:颤振/材料.省道”;
导入“包装:voota/utils/Hex2Color.dart”;
导入“包:intl/intl.dart”;
类BaseAppBar扩展无状态小部件实现PreferredSizeWidget{
最终颜色bgColor=HexToColor('#508bbb');
最后的字符串标题;
最终AppBar AppBar;
最终列表小部件;
最终列表下拉选择;
BaseAppBar({Key-Key,this.title,this.appBar,this.widgets,this.dropdownChoices}):超级(Key:Key);
@凌驾
小部件构建(构建上下文){
DateTime now=DateTime.now();
字符串formattedDate=DateFormat('MMMM d,y')。格式(现在);
打印('appbar.count下拉选项${dropdowntchoices.length}');
返回AppBar(
标题:RichText(
text:TextSpan(
文字:“VOOTA”+标题,
样式:TextStyle(
字体大小:15.0,
颜色:颜色,白色,
),
儿童:[
TextSpan(文本:'\n'),
TextSpan(
文本:formattedDate,
样式:TextStyle(
字体大小:10.0,
颜色:颜色,白色,
),
),
]),
textAlign:textAlign.center,
),
标题:对,
背景颜色:bgColor,
海拔:0,
行动:[
弹出菜单按钮(
onSelected:null,
标高:6,
itemBuilder:(构建上下文){
返回dropdownChoices.map((dropdownChoices选项){
返回PopupMenuItem(
价值:选择,
子项:文本(选项.标题),
);
}).toList();
},
),
],
);
}
@凌驾
Size get preferredSize=>new Size.fromHeight(appBar.preferredSize.height);
}
类下拉选择{
常量下拉选项({this.title,this.icon});
最后的字符串标题;
最终的Iconda图标;
}
在需要AppBar的每个屏幕中,我导入AppBar.dart文件并将下拉选项传递给AppBar,如:
class UserProfile extends StatefulWidget {
@override
_UserProfile createState() => _UserProfile();
}
class _UserProfile extends State<UserProfile> {
final String title = 'Profile';
final bgcolor = HexToColor('#508bbb');
final list = List();
final isLoading = false;
List<DropdownChoices> userdropdownchoices = <DropdownChoices>[
DropdownChoices(title: 'Bike', icon: Icons.directions_bike),
DropdownChoices(title: 'Car', icon: Icons.directions_car),
DropdownChoices(title: 'Bus', icon: Icons.directions_bus),
DropdownChoices(title: 'Trains', icon: Icons.directions_railway),
];
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: BaseAppBar(title: title, appBar: AppBar(), dropdownChoices: userdropdownchoices),
.....
类UserProfile扩展StatefulWidget{
@凌驾
_UserProfile createState()=>\u UserProfile();
}
类_UserProfile扩展状态{
最终字符串标题='Profile';
最终bgcolor=六色('#508BB');
最终列表=列表();
最终卸载=假;
List userdropdownchoices=[
下拉选择(标题:“自行车”,图标:图标。方向和自行车),
下拉选择(标题:“汽车”,图标:图标。方向和汽车),
下拉选择(标题:“总线”,图标:Icons.directions\u Bus),
下拉选择(标题:“火车”,图标:图标。方向和铁路),
];
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:BaseAppBar(标题:title,appBar:appBar(),dropdownChoices:userdropdownchoices),
.....
这似乎有效…现在我必须检查列表是否包含项目,是否显示下拉菜单。但我愿意接受任何建议;)我按以下方式操作,希望这是正确的: 在我的AppBar中,我添加了一个带有DropdownChoices的类,并使用参数DropdownChoices扩展了BaseAppBar
import 'package:flutter/material.dart';
import 'package:voota/utils/Hex2Color.dart';
import 'package:intl/intl.dart';
class BaseAppBar extends StatelessWidget implements PreferredSizeWidget {
final Color bgColor = HexToColor('#508bbb');
final String title;
final AppBar appBar;
final List<Widget> widgets;
final List<DropdownChoices> dropdownChoices;
BaseAppBar({Key key, this.title, this.appBar, this.widgets, this.dropdownChoices}) : super(key: key);
@override
Widget build(BuildContext context) {
DateTime now = DateTime.now();
String formattedDate = DateFormat('MMMM d, y').format(now);
print('app bar. count dropdown choices ${dropdownChoices.length}');
return AppBar(
title: RichText(
text: TextSpan(
text: 'VOOTA ' + title,
style: TextStyle(
fontSize: 15.0,
color: Colors.white,
),
children: [
TextSpan(text: '\n'),
TextSpan(
text: formattedDate,
style: TextStyle(
fontSize: 10.0,
color: Colors.white,
),
),
]),
textAlign: TextAlign.center,
),
centerTitle: true,
backgroundColor: bgColor,
elevation: 0,
actions: <Widget>[
PopupMenuButton<DropdownChoices>(
onSelected: null,
elevation: 6,
itemBuilder: (BuildContext context) {
return dropdownChoices.map((DropdownChoices choice) {
return PopupMenuItem<DropdownChoices>(
value: choice,
child: Text(choice.title),
);
}).toList();
},
),
],
);
}
@override
Size get preferredSize => new Size.fromHeight(appBar.preferredSize.height);
}
class DropdownChoices {
const DropdownChoices({this.title, this.icon});
final String title;
final IconData icon;
}
导入“包装:颤振/材料.省道”;
导入“包装:voota/utils/Hex2Color.dart”;
导入“包:intl/intl.dart”;
类BaseAppBar扩展无状态小部件实现PreferredSizeWidget{
最终颜色bgColor=HexToColor('#508bbb');
最后的字符串标题;
最终AppBar AppBar;
最终列表小部件;
最终列表下拉选择;
BaseAppBar({Key-Key,this.title,this.appBar,this.widgets,this.dropdownChoices}):超级(Key:Key);
@凌驾
小部件构建(构建上下文){
DateTime now=DateTime.now();
字符串formattedDate=DateFormat('MMMM d,y')。格式(现在);
打印('appbar.count下拉选项${dropdowntchoices.length}');
返回AppBar(
标题:RichText(
text:TextSpan(
文字:“VOOTA”+标题,
样式:TextStyle(
字体大小:15.0,
颜色:颜色,白色,
),
儿童:[
TextSpan(文本:'\n'),
TextSpan(
文本:formattedDate,
样式:TextStyle(
字体大小:10.0,
颜色:颜色,白色,
),
),
]),
textAlign:textAlign.center,
),
标题:对,
背景颜色:bgColor,
海拔:0,
行动:[
弹出菜单按钮(
onSelected:null,
标高:6,
itemBuilder:(构建上下文){
返回dropdownChoices.map((dropdownChoices选项){
返回PopupMenuItem(
价值:选择,
子项:文本(选项.标题),
);
}).toList();
},
),
],
);
}
@凌驾
Size get preferredSize=>new Size.fromHeight(a