I wanna make flutter app.
How to make a moving title on appbar when scrolloing??
I attached app's status on GIF file.
Where do I need to set moving the title text?
I just make app like Uber app
#override
Widget build(BuildContext context) {
double sliderValue = 0.0;
return Scaffold(
body: NestedScrollView(
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
return <Widget>[
SliverOverlapAbsorber(
handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
child: SliverAppBar(
forceElevated: innerBoxIsScrolled ,
backgroundColor: Colors.transparent,
leading: IconButton(
onPressed: () {
Navigator.pop(context);
},
icon: Icon(Icons.arrow_back),
color: Colors.black,
),
elevation: 0.0,
expandedHeight: 100.0,
floating: false,
pinned: true,
flexibleSpace: FlexibleSpaceBar(
titlePadding: EdgeInsets.only(left: 15.0),
collapseMode: CollapseMode.none,
title: Text("Notification",
style: TextStyle(
color: Colors.black,
fontSize: 20.0,
)),
),
),
),
];
},
body: Center(
child: Text("Sample Text"),
),
),
);
}
Have to use CustomScrollView widget
CustomScrollView(
slivers: <Widget>[
SliverAppBar(
title: Text('Title'),
pinned: true,
expandedHeight: 48,
),
SliverFillRemaining(
child: Center(
child: Text('sliver'),
)),
],
);
Related
I'm creating an app where I need to implement WhatsApp like AppBar i.e to hide app bar on scroll down and show on reverse.
You can use the SliverAppBar and CustomScrollView to achieve this effect. A sample implementation:
Widget build(BuildContext context) {
return Scaffold(
body: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
pinned: false,
snap: false,
floating: false,
expandedHeight: 160.0,
flexibleSpace: const FlexibleSpaceBar(
title: Text('AppBar'),
),
),
SliverList(
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container(
color: index.isOdd ? Colors.white : Colors.black12,
height: 100.0,
child: Center(
child: Text('$index', textScaleFactor: 5),
),
);
},
childCount: 50,
),
),
],
),
);
}
I'm trying to implement a custom tab bar widget inside a SliverAppBar. So far I've tried wrapping my CustomTabBar within a PreferredSize widget.
Here's my code:
Widget _buildBody(){
return NestedScrollView(
headerSliverBuilder: (BuildContext context, bool boxIsScrolled) {
return <Widget>[
SliverAppBar(
leading: Container(),
backgroundColor: Colors.transparent,
expandedHeight: 200.0,
flexibleSpace: FlexibleSpaceBar(
collapseMode: CollapseMode.pin,
background: Column(
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Text(
"Item 1"
),
Text(
"Item 2"
),
Text(
"Item 3"
)
],
)
]),
),
bottom: PreferredSize(
preferredSize: Size.fromHeight(kToolbarHeight),
child: CustomTabWidget(
items: ['Challenge', 'My friends'],
activeColor: secondaryColor,
currentIndex: currentIndex,
backgroundColor: tabColor,
activeTextColor: Colors.white,
backgroundTextColor: Colors.white,
onTabSelect: (int index) {
onLeaderboardTabSelect(index);
},
),
),];
},
body: ListView.separated(
itemCount: 50,
itemBuilder: (context, index) {
return ListTile(
title: Text('row $index'),
);
},
separatorBuilder: (context, index) {
return Divider();
},
) // should return listview depending on the tab
);
}
CustomTabWidget
Widget build(BuildContext context) {
return Container(
height: height,
decoration: BoxDecoration(
color: backgroundColor,
borderRadius: BorderRadius.circular(
30.0,
),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: _buildItems(context),
),
);
}
The code successfully shows the my custom tab bar widget but whenever I scroll down or tap another tab, it disappears.
I might have overlooked something within the code.
Can anyone help me?
this work on my project
class TabBarInSliverAppbar extends StatelessWidget {
#override
Widget build(BuildContext context) {
return DefaultTabController(
length: 2,
child: Scaffold(
body: CustomScrollView(
slivers: [
SliverAppBar(
title: Text("Tabbar in SliverAppbar Example"),
pinned: true,
floating: true,
bottom: TabBar(
tabs: <Widget>[
Tab(
text: "First Tab",
),
Tab(
text: "Second Tab",
),
],
),
),
SliverToBoxAdapter(
child: TabBarView(
children: <Widget>[
Center(
child: Text("First Tab"),
),
Center(
child: Text("Second Tab"),
),
],
),
),
],
),
),
);
}
}
you can also checki this link :Flutter TabBar and SliverAppBar that hides when you scroll down
I am trying to implement something similar to this in Flutter.
https://a.imge.to/2019/08/22/mgrjU.png
But I am stuck on this at the moment.
https://a.imge.to/2019/08/22/mgB62.png
The action buttons are pinned to the top of the UI and do not move with the text. Is there any way to bring them down in the Sliver?
I have not been able to find a way to add actions to the flexibleSpace part of the SliverAppBar.
SliverAppBar(
floating: false,
pinned: true,
expandedHeight: 150.0,
backgroundColor: Color.fromRGBO(58, 66, 86, 1.0),
flexibleSpace: const FlexibleSpaceBar(
title: Text("User Status", textAlign: TextAlign.justify,),
titlePadding: EdgeInsets.all(15.0),
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.refresh),
onPressed: () {},
),
IconButton(
icon: Icon(Icons.search),
onPressed: () {},
),
],
);
I want the action buttons to come down with the title text. And when the user scrolls, the buttons should move with the title text.
I'm not sure how you did it, try this working code.
Output:
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color.fromRGBO(58, 66, 86, 1.0),
body: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
floating: false,
pinned: true,
expandedHeight: 150.0,
backgroundColor: Color.fromRGBO(58, 66, 86, 1.0),
flexibleSpace: Row(
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
Container(
width: 200,
child: FlexibleSpaceBar(title: Text("User Status")),
),
Spacer(),
IconButton(
icon: Icon(Icons.refresh),
onPressed: () {},
),
IconButton(
icon: Icon(Icons.search),
onPressed: () {},
)
],
),
),
SliverList(
delegate: SliverChildBuilderDelegate((_, i) {
return ListTile(title: Text("Item ${i}"));
}, childCount: 20),
),
],
),
);
}
I am trying to set up a SliverAppBar in a CustomScrollView using Flutter, and can't get to vertically center the title.
I already tried this solution (and this SO question is exactly what I want to do) but fortunately, it didn't work for me.
Here is my build method:
#override
Widget build(BuildContext context) {
return Scaffold(
body: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
pinned: true,
expandedHeight: 200,
//backgroundColor: Colors.transparent,
flexibleSpace: FlexibleSpaceBar(
titlePadding: EdgeInsets.zero,
centerTitle: true,
title: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text("Should be centered", textAlign: TextAlign.center),
],
),
background: Image.asset("assets/earth.jpg", fit: BoxFit.cover),
),
actions: <Widget>[
IconButton(
icon: const Icon(Icons.menu),
tooltip: "Menu",
onPressed: () {
// onPressed handler
},
),
],
),
SliverFixedExtentList(
itemExtent: 50,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container(
alignment: Alignment.center,
color: Colors.green,
child: Text("Index n°$index"),
);
},
),
)
],
),
);
}
I really don't understand what is wrong and why it isn't centered. I observed that the column is way too big when setting mainAxisSize to mainAxisSize.max.
Any idea?
Thanks in advance!
I tinkered around a bit in your code and was able to center it. So the main problem here was the expandedHeight. This height expands the SliverAppBar both upwards and downwards meaning that half of that 200 was always above the screen. Taking that into consideration, you would be trying to center the text in only the bottom half of the app bar. The simplest way was to just use Flexible to size the items relative to their container. Here's the working code:
#override
Widget build(BuildContext context) {
return Scaffold(
body: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
pinned: true,
expandedHeight: 200,
//backgroundColor: Colors.transparent,
flexibleSpace: FlexibleSpaceBar(
titlePadding: EdgeInsets.zero,
centerTitle: true,
title: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Flexible(
flex: 3,
child: Container(),
),
Flexible(
flex: 1,
child:
Text("Should be centered", textAlign: TextAlign.center),
),
Flexible(
flex: 1,
child: Container(),
),
],
),
background: Image.asset("assets/earth.png", fit: BoxFit.cover),
),
actions: <Widget>[
IconButton(
icon: const Icon(Icons.menu),
tooltip: "Menu",
onPressed: () {
// onPressed handler
},
),
],
),
SliverFixedExtentList(
itemExtent: 50,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container(
alignment: Alignment.center,
color: Colors.green,
child: Text("Index n°$index"),
);
},
),
)
],
),
);
}
A way without empty containers
#override
Widget build(BuildContext context) {
return Scaffold(
body: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
pinned: true,
expandedHeight: 200,
flexibleSpace: FlexibleSpaceBar(
titlePadding: EdgeInsets.zero,
centerTitle: true,
title: SizedBox(
height: 130,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("Should be centered", textAlign: TextAlign.center),
],
),
),
background: Image.asset("assets/earth.png", fit: BoxFit.cover),
),
actions: <Widget>[
IconButton(
icon: const Icon(Icons.menu),
tooltip: "Menu",
onPressed: () {
// onPressed handler
},
),
],
),
SliverFixedExtentList(
itemExtent: 50,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container(
alignment: Alignment.center,
color: Colors.green,
child: Text("Index n°$index"),
);
},
),
)
],
),
);
}
Instead of using a FlexibleSpaceBar use a different Widget.
flexibleSpace: Padding(
padding: EdgeInsets.all(4),
child: Container(),
}),
),
Kinda like what Pedro said earlier, you can instead use the flexibleSpace parameter in SliverAppBar, and then center things from there. This is what I did.
SliverAppBar(
flexibleSpace: Center(
child: Text("27 is my favorite number")
)
)
I have a background image in my SliverAppBar. I've tried the BoxFit.contain, BoxFit.fill...etc, but none of them work for what I'd like to do.
Here is what I can get:
But here's what I want:
I see there is BoxFit.values but I cannot find any documentation showing how to use this (if it's the right thing?)
Here's my code:
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:my_app/Theme.dart' as MyTheme;
import 'package:my_app/ui/rule_section_details/RuleRow.dart';
#override
class SliverHeaderTest extends StatelessWidget {
final DocumentSnapshot ruleGroup;
SliverHeaderTest(this.ruleGroup);
#override
Widget build(BuildContext context) {
return Material(
child: CustomScrollView(slivers: <Widget>[
SliverAppBar(
floating: true,
backgroundColor: Color(int.parse(ruleGroup['color'])),
expandedHeight: 200.0,
flexibleSpace: FlexibleSpaceBar(
// background: Image.asset('assets/img/circular-image.png',
// fit: BoxFit.contain),
background: new Image(
image: new AssetImage(ruleGroup['image']),
height: MyTheme.Dimens.ruleGroupListIconHeight,
width: MyTheme.Dimens.ruleGroupListIconWidth,
),
title: Text(ruleGroup['name'],
style: MyTheme.TextStyles.ruleSectionPageTitle),
centerTitle: true,
),
actions: <Widget>[
IconButton(
icon: const Icon(Icons.share),
tooltip: 'Share',
onPressed: () {/* ... */},
),
],
),
StreamBuilder(
stream: Firestore.instance
.collection('rules')
.where("section", isEqualTo: ruleGroup['id'])
.orderBy("subsection")
.orderBy("subsubsection")
.orderBy("subsubsubsection")
.snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return SliverList(
delegate: SliverChildListDelegate(
[
Container(
child: new Center(child: new Text('Loading...')),
)
],
),
);
}
return SliverPadding(
padding: EdgeInsets.only(top: 16.0),
sliver: SliverList(
delegate: SliverChildBuilderDelegate((context, index) {
return new RuleRow(snapshot.data.documents[index]);
}, childCount: snapshot.data.documents.length)));
})
]),
);
}
}
It is the Desired behavior of background: property of FlexibleSpaceBar - its Suppose to fill all the background area of the Appbar, now title here is not separate element to render below background, but a foreground widget of the FlexibleSpaceBar to show on top of background:
If You really need to separate the title & Image here you can't use background & title property, but Instead you need to use Column or ListView instead of FlexibleSpaceBar.
You can try the Following Code with Possible options:
Recommended Solution:
SliverAppBar(
backgroundColor: Colors.blue,
expandedHeight: 200.0,
floating: true,
// pinned: true,
flexibleSpace: FlexibleSpaceBar(
centerTitle: true,
title: Text("Collapsing Toolbar",
style: TextStyle(
color: Colors.white,
fontSize: 16.0,
)),
background: Row(
children: <Widget>[
Spacer(),
CircleAvatar(
radius: 54.0,
backgroundImage: NetworkImage(
"https://placeimg.com/640/480/animals",
),
),
Spacer(),
],
)),
),
This Image is with radius: 68.0,.
Following are using fixed Margins, might cause issue in responsive design, but still works.
With ClipOval:
SliverAppBar(
backgroundColor: Colors.blue,
expandedHeight: 200.0,
floating: true,
// pinned: true,
flexibleSpace: FlexibleSpaceBar(
centerTitle: true,
title: Text("Collapsing Toolbar",
style: TextStyle(
color: Colors.white,
fontSize: 16.0,
)),
background: Container(
margin:
EdgeInsets.symmetric(horizontal: 125.0, vertical: 50.0),
child: ClipOval(
child: Image.network(
"https://placeimg.com/640/480/animals",
),
),
)),
),
with CircleAvatar
SliverAppBar(
backgroundColor: Colors.blue,
expandedHeight: 200.0,
floating: true,
// pinned: true,
flexibleSpace: FlexibleSpaceBar(
centerTitle: true,
title: Text("Collapsing Toolbar",
style: TextStyle(
color: Colors.white,
fontSize: 16.0,
)),
background: Container(
margin:
EdgeInsets.symmetric(horizontal: 125.0, vertical: 50.0),
child: CircleAvatar(
radius: 30.0,
backgroundImage: NetworkImage(
"https://placeimg.com/640/480/animals",
),
),
)),
),
Update:
with ListView Option.
Note: AppBar height is Determined by expandedHeight: property & will not increase in case of increase in Image Radius.
SliverAppBar(
backgroundColor: Colors.blue,
expandedHeight: 200.0,
floating: true,
// pinned: true,
flexibleSpace: Center(
child: ListView(
shrinkWrap: true,
children: <Widget>[
Row(
children: <Widget>[
Spacer(),
CircleAvatar(
radius: 68.0,
backgroundImage: NetworkImage(
"https://placeimg.com/640/480/animals",
),
),
Spacer(),
],
),
Center(
child: Text("Collapsing Toolbar",
style: TextStyle(
color: Colors.white,
fontSize: 22.0,
)),
),
],
),
),
),