我想获得这样的效果-向上滚动时,应用程序栏是透明的,在其下方可以看到列表视图:
并且向下滚动,只有白色-应用栏下方的第一项:
我的窗口布局:
return Container(
color: AppTheme.nearlyWhite,
child: SafeArea(
top: false,
bottom: false,
child: Scaffold(
backgroundColor: AppTheme.nearlyWhite,
body: Stack(
children: <Widget>[
DrawerUserController(
screenIndex: _drawerIndex,
drawerWidth: MediaQuery.of(context).size.width * 0.75,
animationController: (AnimationController animationController) => _sliderAnimationController = animationController,
onDrawerCall: (DrawerIndex drawerIndexdata) => _onDrawerCall(drawerIndexdata, _forceRefresh),
onDrawerTap:(DrawerIndex drawerIndexdata) => _onDrawerTap(drawerIndexdata),
screenView: Column(
children: <Widget>[
Padding(
padding: EdgeInsets.fromLTRB(8, MediaQuery.of(context).padding.top + 8, 8, 8),
child: _createAppBar(),
),
Expanded(
child:
Container(
color: Colors.white,
child: _screenView,
)
),
],
),
),
new FabDialer(_fabMiniMenuItemList, Colors.blue, new Icon(Icons.add))
],
),
),
),
);
}
_screenView
是简单的Listview().builder()
,它显示每个项目的InkWell
小部件。我的应用栏是自定义的,定义如下:
_createAppBar() {
return SizedBox(
height: AppBar().preferredSize.height,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(top: 8, left: 8),
child: Container(
width: AppBar().preferredSize.height - 8,
height: AppBar().preferredSize.height - 8,
),
),
Expanded(
child: Center(
child: Padding(
padding: const EdgeInsets.only(top: 4),
child: Column(
children: <Widget>[
Text(
_menuSelected,
style: TextStyle(
fontSize: 22,
color: AppTheme.darkText,
fontWeight: FontWeight.w400,
),
),
Text(
globals.cityName,
style: TextStyle(
fontSize: 15,
color: AppTheme.darkerText,
fontWeight: FontWeight.w400,
),
),
],
),
),
),
),
Padding(
padding: const EdgeInsets.only(top: 8, right: 8),
child: Container(
width: AppBar().preferredSize.height - 8,
height: AppBar().preferredSize.height - 8,
color: Colors.white,
child: Material(
color: Colors.transparent,
child: InkWell(
borderRadius:
BorderRadius.circular(AppBar().preferredSize.height),
child: Icon(Icons.refresh, color: AppTheme.dark_grey,),
onTap: () => setState(() => _forceRefresh = true),
),
),
),
),
],
),
);
}
这是第一个可见的列表现在的样子:
我试图将Appbar Backround设置为具有透明性的颜色,但没有成功。另外,我还需要使小部件实际重叠(ListView
需要与我的应用栏重叠),并且它会从Flutter生成错误消息。
任何想法如何正确地做到这一点?
@override
Widget build(BuildContext context) {
return Container(
child: Stack(
children:[
Container(
color:Colors.white,
padding:EdgeInsets.all(10),
child:ListView.builder(
itemCount:25+1,
//length + 1 is beacause to show 1st item at the beginning
shrinkWrap:true,
itemBuilder:(con,ind){
return ind==0 ?
Container(height:70)
:ListTile(
title:Text('Item $ind',
style:TextStyle(color:Colors.black,))
);
}
)
),
Container(
height:70,
color:Colors.transparent,
child:Card(
color:Colors.white.withAlpha(80),
child: Row(
children:[
Expanded(
flex:1,
child: IconButton(
icon:Icon(Icons.list,color:Colors.black,size:25),
onPressed:(){
//todo
}
),
),
Expanded(
flex:3,
child: Text('Title',
style:TextStyle(color:Colors.black,)),
),
Expanded(
flex:1,
child: IconButton(
icon:Icon(Icons.search,color:Colors.black,size:25),
onPressed:(){
//todo
}
),
),
Expanded(
flex:1,
child: IconButton(
icon:Icon(Icons.more_vert,color:Colors.black,size:25),
onPressed:(){
//todo
}
),
)
]
),
)
)
]
)
);
}
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
backgroundColor: Colors.white,
body: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
pinned: true,
backgroundColor: Colors.white,
title: Text('Title', style: TextStyle(color: Colors.black)),
),
SliverList(
delegate: SliverChildListDelegate(List.generate(100, (i) => _buildListTile(i))),
),
],
),
),
);
}
Widget _buildListTile(int i) {
return ListTile(title: Text('Item $i'));
}
}