I don't know how to make the bottom navigation bar blur with the background in Flutter as shown below
I want the bottom navigation bar to blur the background near the bottom of the screen, but I can only do it below with a white background with two very thick top and bottom borders that obscure the content
here is my code,
class _MainPageState extends State<MainPage> {
var currentIndex = 0;
//int currentIndex = 0;
void onTabTapped(int index) {
setState(() {
currentIndex = index;
HapticFeedback.lightImpact();
});
}
final screens = [
const HomePage(),
NotificationPage(),
MessagePage(),
BookmarkPage(),
];
List<IconData> listOfIcons = [
Icons.home_rounded,
Icons.notifications,
Icons.message_rounded,
Icons.library_books,
];
List<String> listOfStrings = [
'Home',
'T.báo',
'T.Nhắn',
'B.Đăng',
];
@override
Widget build(BuildContext context) {
double displayWidth = MediaQuery.of(context).size.width;
return Scaffold(
backgroundColor: Colors.white,
body: SafeArea(child: screens[currentIndex]),
bottomNavigationBar: Container(
margin: EdgeInsets.all(displayWidth * .03),
height: displayWidth * .155,
decoration: BoxDecoration(
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.black.withOpacity(.1),
blurRadius: 30,
offset: Offset(0, 10),
),
],
borderRadius: BorderRadius.circular(50),
),
child: ListView.builder(
itemCount: 4,
scrollDirection: Axis.horizontal,
padding: EdgeInsets.symmetric(horizontal: displayWidth * .02),
itemBuilder: (context, index) => InkWell(
onTap: () {
setState(() {
currentIndex = index;
HapticFeedback.lightImpact();
});
},
splashColor: Colors.transparent,
highlightColor: Colors.transparent,
child: Stack(
children: [
AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
width: index == currentIndex
? displayWidth * .32
: displayWidth * .18,
alignment: Alignment.center,
child: AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
height: index == currentIndex ? displayWidth * .12 : 0,
width: index == currentIndex ? displayWidth * .32 : 0,
decoration: BoxDecoration(
color: index == currentIndex
? Color(0xffEC1C24).withOpacity(.2)
: Colors.transparent,
borderRadius: BorderRadius.circular(50),
),
),
),
AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
width: index == currentIndex
? displayWidth * .31
: displayWidth * .18,
alignment: Alignment.center,
child: Stack(
children: [
Row(
children: [
AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
width:
index == currentIndex ? displayWidth * .13 : 0,
),
AnimatedOpacity(
opacity: index == currentIndex ? 1 : 0,
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
child: Text(
index == currentIndex
? '${listOfStrings[index]}'
: '',
style: TextStyle(
color: Color(0xffEC1C24),
fontWeight: FontWeight.w600,
fontSize: 15,
),
),
),
],
),
Row(
children: [
AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
width:
index == currentIndex ? displayWidth * .03 : 20,
),
Icon(
listOfIcons[index],
size: displayWidth * .076,
color: index == currentIndex
? Color(0xffEC1C24)
: Colors.black26,
),
],
),
],
),
),
],
),
),
),
),
);
}
}
Thank you very much for your comments and contributions.
CodePudding user response：
bottomNavigationBar is render below body in scaffold so they cannot collapse.
You could use stack instead to stack your custom navigation bar onto the body content and use BackdropFilter to blur out the background
here's the sample code:
body: Stack(
children: [
ListView(
children: [
],
),
Column(
children: [
Spacer(),
ClipRect(
// set boundary for BackdropFilter
child: BackdropFilter(
filter: ImageFilter.blur(
sigmaX: 2,
sigmaY: 2,
),
child: Column(
children: [
Container(
// this is your bottomNavBar
height: 50,
decoration: BoxDecoration(
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.black.withOpacity(.1),
blurRadius: 30,
offset: Offset(0, 10),
),
],
borderRadius: BorderRadius.circular(50),
),
),
const SizedBox(
height: 16.0,
)
],
),
),
),
],
),
],
),
CodePudding user response：
It's relatively simple, first you need to set the body to extendBody: true in the Scaffold, this will make the bottomNavigation over the body of the scaffold.
It is important that the content of the body is as Clip.none, as I did with the SingleChildScrollView, this is to prevent the content from being cut before BottomNavigation.
For bottomNavigation, we will use a stack to add its bar over the backdropfilter, which will blur the content.
full code
class MyBottomNavigation extends StatefulWidget {
const MyBottomNavigation({Key? key}) : super(key: key);
@override
State<MyBottomNavigation> createState() => _MyBottomNavigationState();
}
class _MyBottomNavigationState extends State<MyBottomNavigation> {
var currentIndex = 0;
//int currentIndex = 0;
void onTabTapped(int index) {
setState(() {
currentIndex = index;
});
}
final pageColumn = [
Text('''What is Lorem Ipsum?
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The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact original form, accompanied by English versions from the 1914 translation by H. Rackham.
Where can I get some?
There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn't anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend to repeat predefined chunks as necessary, making this the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always free from repetition, injected humour, or non-characteristic words etc.''', textAlign: TextAlign.justify,),
];
final screens = [
Container(),
Container(),
Container(),
Container(),
];
List<IconData> listOfIcons = [
Icons.home_rounded,
Icons.notifications,
Icons.message_rounded,
Icons.library_books,
];
List<String> listOfStrings = [
'Home',
'T.báo',
'T.Nhắn',
'B.Đăng',
];
@override
Widget build(BuildContext context) {
double displayWidth = MediaQuery.of(context).size.width;
return Scaffold(
backgroundColor: Colors.white,
body: SafeArea(child:SingleChildScrollView(
clipBehavior: Clip.none,
child: Column(children: pageColumn),
)),
extendBody: true,
bottomNavigationBar: Stack(
alignment: Alignment.bottomCenter,
children: [
ClipRect(
child: BackdropFilter(
filter: ImageFilter.blur(
sigmaX: 1.0,
sigmaY: 1.0,
),
child: Container(
width: double.maxFinite,
height: displayWidth * .180,
color: Colors.black.withOpacity(0)
)
)
),
Container(
margin: EdgeInsets.all(displayWidth * .03),
height: displayWidth * .155,
decoration: BoxDecoration(
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.black.withOpacity(.1),
blurRadius: 30,
offset: Offset(0, 10),
),
],
borderRadius: BorderRadius.circular(50),
),
child: ListView.builder(
itemCount: 4,
scrollDirection: Axis.horizontal,
padding: EdgeInsets.symmetric(horizontal: displayWidth * .02),
itemBuilder: (context, index) => InkWell(
onTap: () {
setState(() {
currentIndex = index;
});
},
splashColor: Colors.transparent,
highlightColor: Colors.transparent,
child: Stack(
children: [
AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
width: index == currentIndex
? displayWidth * .32
: displayWidth * .18,
alignment: Alignment.center,
child: AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
height: index == currentIndex ? displayWidth * .12 : 0,
width: index == currentIndex ? displayWidth * .32 : 0,
decoration: BoxDecoration(
color: index == currentIndex
? Color(0xffEC1C24).withOpacity(.2)
: Colors.transparent,
borderRadius: BorderRadius.circular(50),
),
),
),
AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
width: index == currentIndex
? displayWidth * .31
: displayWidth * .18,
alignment: Alignment.center,
child: Stack(
children: [
Row(
children: [
AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
width:
index == currentIndex ? displayWidth * .13 : 0,
),
AnimatedOpacity(
opacity: index == currentIndex ? 1 : 0,
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
child: Text(
index == currentIndex
? '${listOfStrings[index]}'
: '',
style: TextStyle(
color: Color(0xffEC1C24),
fontWeight: FontWeight.w600,
fontSize: 15,
),
),
),
],
),
Row(
children: [
AnimatedContainer(
duration: Duration(seconds: 1),
curve: Curves.fastLinearToSlowEaseIn,
width:
index == currentIndex ? displayWidth * .03 : 20,
),
Icon(
listOfIcons[index],
size: displayWidth * .076,
color: index == currentIndex
? Color(0xffEC1C24)
: Colors.black26,
),
],
),
],
),
),
],
),
),
),
),
],
),
);
}
}