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I don't have much experience in flutter yet, and I curious of how can I achieved custom AppBar that can be animated.
I just want to apply a simple animation to the AppBar which will only change the height of the AppBar. As I understand that the AppBar must be a PreferredSizeWidget and I want to animate it to change the height, there are couple articles that I read but mostly it uses SilverAppBar.
Thanks.
class CustomAppBarRounded extends StatelessWidget implements PreferredSizeWidget{
final String _appBarTitle;
CustomAppBarRounded(this._appBarTitle);
#override
Widget build(BuildContext context) {
return new Container(
child: new LayoutBuilder(builder: (context, constraint) {
final width = constraint.maxWidth * 8;
return new ClipRect(
child: Stack(
children: <Widget>[
new OverflowBox(
maxHeight: double.infinity,
maxWidth: double.infinity,
child: new SizedBox(
width: width,
height: width,
child: new Padding(
padding: new EdgeInsets.only(
bottom: width / 2 - preferredSize.height / 3
),
child: new DecoratedBox(
decoration: new BoxDecoration(
color: Colors.indigo,
shape: BoxShape.circle,
boxShadow: [
new BoxShadow(color: Colors.black54, blurRadius: 10.0)
],
),
),
),
),
),
new Center(
child: new Text("${this._appBarTitle}",
style: TextStyle(
fontSize: 24,
fontWeight: FontWeight.bold,
color: Colors.white,
shadows: [
Shadow(color: Colors.black54, blurRadius: 10.0)
]
),
)
),
],
)
);
}),
);
}
#override
Size get preferredSize => const Size.fromHeight(100.0);
}
I've figured out how to achieve what I wanted. So I returned the PreferredSizeWidget
class CustomRoundedAppBar extends StatelessWidget{
double height = 100;
final String title;
CustomRoundedAppBar(
this.height,
this.title);
#override
Widget build(BuildContext context) {
return PreferredSize(
preferredSize: Size(this.height, this.height),
child: AnimatedContainer(
duration: Duration(seconds: 1),
height: this.height,
child: new LayoutBuilder(builder: (context, constraint){
final width =constraint.maxWidth * 8;
return new ClipRect(
child: Stack(
children: <Widget>[
new OverflowBox(
maxHeight: double.infinity,
maxWidth: double.infinity,
child: new SizedBox(
width: width,
height: width,
child: new Padding(
padding: new EdgeInsets.only(
bottom: width / 2 - this.height / 3
),
child: new DecoratedBox(
decoration: new BoxDecoration(
color: Colors.indigo,
shape: BoxShape.circle,
boxShadow: [
new BoxShadow(color: Colors.black54, blurRadius: 10.0)
],
),
),
),
),
),
new Center(
child: new Text("${this.title}",
style: TextStyle(
fontSize: 24,
fontWeight: FontWeight.bold,
color: Colors.white,
shadows: [
Shadow(color: Colors.black54, blurRadius: 10.0)
]
),
)
),
],
)
);
})
),
);
}
}
And on the Scaffold I have an action when button is pressed it will change the height, which must be on the setState()
onPressed: (){
setState(() {
this.height = 200;
this. _appBarTitle = "TEST";
});
},
I would like to show a default local image if CachedNetworkImageProvider fails to get the remote image for some reason:
Container(
width: 80.0,
height: 120.0,
decoration: new BoxDecoration(
shape: BoxShape.rectangle,
image: new DecorationImage(
fit: BoxFit.fill,
image: new CachedNetworkImageProvider(url),
),
),
),
#Abdullah Khan - I ended up with this:
CachedNetworkImage(
imageUrl: url,
placeholder: (context, url) => CircularProgressIndicator(),
errorWidget: (context, url, error) => GestureDetector(
onTap: () {
setAvatar();
},
child: Icon(
Icons.account_circle,
size: 100.0,
color: Theme.of(context).primaryColor,
),
),
imageBuilder: (context, image) => Hero(
tag: 'photo',
child: GestureDetector(
onTap: () {
Get.toNamed(Routes.FULLPHOTO,
arguments: {
'url': url,
'name': photoTitle,
'idx': 0
});
},
child: CircleAvatar(
backgroundImage: image,
radius: size,
),
),
),
),
Get.toNamed comes from the GetX package (great for navigation and state management).
#Kamlesh, something like this?:
Container(
margin: EdgeInsets.only(right: 8, left: 8, top: 8, bottom: 8),
width: 80,
height: 80,
decoration: BoxDecoration(
// borderRadius: BorderRadius.all(Radius.circular(14)),
// color: Colors.blue.shade200,
image: DecorationImage(
fit: BoxFit.contain,
image: CachedNetworkImageProvider(
ipath,
),
),
),
),
You can use the cached network image plugin which has an errorWidget parameter, the installation steps are explained on the link. This is an example implementation of it :
image: new CachedNetworkImage(
imageUrl: "http://via.placeholder.com/350x150",
placeholder: new CircularProgressIndicator(),
errorWidget: new Image.assets('error.jpg'), // This is what you need
fit: BoxFit.fill,
fadeInCurve: Curves.easeIn ,
fadeInDuration: Duration(seconds: 2),
fadeOutCurve: Curves.easeOut,
fadeOutDuration: Duration(seconds: 2),
),
you can notice that it also has other features like placeholder and animations ,so you will have more capabilities to tinker with.
I would like to control the profile image size, and get it rounded instead of oval as shown below.
Changing the height and/or the width values doesn't affect neither the size nor the ratio, also the weird thing is when I change the margin parameter it changes the oval shape radius.
new UserAccountsDrawerHeader(
decoration: BoxDecoration(color: Colors.white),
currentAccountPicture: new Container(
margin: const EdgeInsets.only(bottom: 40.0),
width: 10.0,
height: 10.0,
decoration: new BoxDecoration(
shape: BoxShape.circle,
image: new DecorationImage(
fit: BoxFit.fill,
image: new NetworkImage(
"https://example.com/assets/images/john-doe.jpg",
),
),
),
),
accountName: new Container(
...
),
accountEmail: new Container(
...
),
onDetailsPressed: () {
...
},
),
What am I doing wrong ?
Update: The above way of doing is a workaround to the CircleAvatar that didn't give any control on the image size. If you tried CircleAvatar in some different way that gives control on image size, please share it to help.
Use This code for network image:
new CircleAvatar(
radius: 60.0,
backgroundColor: const Color(0xFF778899),
backgroundImage: NetworkImage("Your Photo Url"), // for Network image
),
Use this for asset Image:
new CircleAvatar(
radius: 60.0,
backgroundColor: const Color(0xFF778899),
child: new Image.asset(
'images/profile.png',
), //For Image Asset
),
If you use backgroundImage as the image provider for CircleAvatar then changing the radius property indeed has no effect. From the source circle_avatar.dart it can be observed the image is being rendered as BoxFit.cover DecorationImage(image: backgroundImage, fit: BoxFit.cover) - and in user_accounts_drawer_header.dart the currentAccountPicture is hardcoded to be a 72.0 pixel SizedBox so the image will always be 72.0px in dimensions.
https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/user_accounts_drawer_header.dart#L57
https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/circle_avatar.dart#L203
Hopefully the Flutter team adds some level of control to this in the future.
Not an answer, just more info that hopefully helps someone.
Try This:
import 'package:flutter/material.dart';
class AppDrawer extends StatefulWidget {
#override
_AppDrawerState createState() => new _AppDrawerState();
}
class _AppDrawerState extends State<AppDrawer> {
#override
Widget build(BuildContext context) {
return new Drawer(
child: Center(
child: Column(
children: <Widget>[
new UserAccountsDrawerHeader(
decoration: BoxDecoration(color: Colors.white),
currentAccountPicture: new CircleAvatar(
radius: 50.0,
backgroundColor: const Color(0xFF778899),
backgroundImage:
NetworkImage("http://tineye.com/images/widgets/mona.jpg"),
),
),
],
),
),
);
}
}
This is the screenshot of output:
Wrap your image in a CircleAvatar widget. It’s made for such purposes.
You put the margin inside the Container of the image while you have to use the margin parameter of the UserAccountDrawerHeader, this is why your image became an oval:
UserAccountsDrawerHeader(
decoration: BoxDecoration(color: Colors.white),
margin: EdgeInsets.only(bottom: 40.0),
currentAccountPicture: Container(
decoration: BoxDecoration(
shape: BoxShape.circle,
image: DecorationImage(
fit: BoxFit.fill,
image:
NetworkImage("https://via.placeholder.com/150"))),
),
accountName: new Container(
child: Text(
'Name',
style: TextStyle(color: Colors.black),
)),
accountEmail: new Container(
child: Text(
'Email',
style: TextStyle(color: Colors.black),
)),
),
You can create your own header:
DrawerHeader(
decoration: BoxDecoration(
color: Colors.blue
),
child: ListView(
children: [
return ClipRRect(
borderRadius: BorderRadius.circular(8.0),
child: Image.asset('images/myImage.jpg'),
),
//These can go here or below the header with the same background color
Text("user name"),//customize this text
Text("useremail#example.com"),
//...additional header items here
],
)),
I found a solution!!! at least thats what worked for me
import 'package:flutter/material.dart';
class HomePage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
// Side menu
drawer: new Drawer(
child: GestureDetector(
onTap: () {},
child: ListView(
children: <Widget>[
new UserAccountsDrawerHeader(
accountName: new Text('Hymn +'),
accountEmail: new Text('johndoe#gmail.com'),
currentAccountPicture: new CircleAvatar(
backgroundImage: new NetworkImage(
'https://miro.medium.com/max/1400/1*uC0kYhn8zRx8Cfd0v0cYQg.jpeg'),
),
),
],
),
),
),
);
}
}
This works for me:
DrawerHeader(
decoration: BoxDecoration(color: Colors.blue),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
/*CircleAvatar(
radius: 50.0,
backgroundColor: const Color(0xFF778899),
child: new Image.asset('assets/images/profile_image.png'), //For Image Asset
),*/
Container(
height: 110,
child: ClipRRect(
borderRadius: BorderRadius.circular(100.0),
child: Image.asset('assets/images/profile_image.png'),
),
),
//These can go here or below the header with the same background color
//Divider(height: 1.0, thickness: 1.0, color: Colors.black),
SizedBox(height: 9.0),
Text("user name"),
//...additional header items here
],
),
),
new Container(
width: 80.0,
height: 80.0,
decoration: new BoxDecoration(
shape: BoxShape.circle,
image: new DecorationImage(
fit: BoxFit.fill,
image: new NetworkImage(widget.profile_picture)))),
At the moment I have a NetworkImage however I wold like to have a round CachedNetworkImage instead.
You can use
ClipRRect(borderRadius: BorderRadius.circular(10000.0),
child: CachedNetworkImage(...))
Since CachedNetworkImageProvider is not a Widget, it doesn't work in place of a CachedNetworkImage. Meaning it won't have the placeholder widget option.
You can use the CachedNetworkImageProvider like this:
new Container(
width: 80.0,
height: 80.0,
decoration: new BoxDecoration(
shape: BoxShape.circle,
image: new DecorationImage(
fit: BoxFit.fill,
image: new CachedNetworkImageProvider(widget.profile_picture),
),
),
),
You can use the imageBuilder of the CachedNetworkImage:
CachedNetworkImage(
imageUrl: imageUrl,
imageBuilder: (context, imageProvider) => Container(
height: 100,
width: 100,
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(50)),
image: DecorationImage(
image: imageProvider,
fit: BoxFit.cover,
),
),
),
placeholder: (context, url) => placeholder,
errorWidget: (context, url, error) => errorWidget,
)
In order to have a rounded image, set the width and height to the same value and set the borderRadius to half the height.
you should try it
ClipOval(
child: CachedNetworkImage(
imageUrl: url,
fit: BoxFit.cover
),
)
BorderRadius and Border Color
1st way
Container(
decoration: BoxDecoration(
border: Border.all(color: Palette.greyTextColor),
borderRadius: BorderRadius.all(Radius.circular(8.0)),),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(8.0)),
child: CachedNetworkImage(
2nd way
CachedNetworkImage(
imageBuilder: (context, imageProvider) => Container(
width: width,
decoration: BoxDecoration(
border: Border.all(color: Palette.greyTextColor),
borderRadius: BorderRadius.all(Radius.circular(8.0)),
image: DecorationImage(image: imageProvider),
),
),
I use this to create a circular cached image network with border color
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
class CircularCachedNetworkImage extends StatelessWidget {
final String imageURL;
final double size;
final Color borderColor;
final BoxFit fit;
final double borderWidth;
const CircularCachedNetworkImage({
required this.imageURL,
required this.size,
required this.borderColor,
this.fit = BoxFit.fill,
this.borderWidth = 2,
});
#override
Widget build(BuildContext context) {
return Container(
width: size,
height: size,
decoration: BoxDecoration(
color: borderColor,
shape: BoxShape.circle,
),
child: Padding(
padding: EdgeInsets.all(borderWidth),
child: Container(
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Colors.white, // inner circle color
),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(300.0)),
child: CachedNetworkImage(
imageUrl: imageURL,
fit: fit,
),
),
),
),
);
}
}
usage
CircularCachedNetworkImage(
imageURL: "your image URL in here",
size: 100,
borderColor: Colors.green,
)
You just need to add clipBehavior: Clip.antiAlias,
You can use ClipOval instead of ClipRRect
child: ClipOval(
child: CachedNetworkImage(imageUrl : url),
fit: BoxFit.cover,
),
I needed an avatar widget that kept the circular shape whether the CachedNetworkImage was square or not, and was not fixed to one size but used the available space. My solution was this:
CircleAvatar(
child: AspectRatio(
aspectRatio: 1,
child: ClipOval(
child: CachedNetworkImage(
imageUrl: imgUrl,
fit: BoxFit.fill,
),
),
),
)
I have the background of my app set like so:
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
home: new Container(
decoration: new BoxDecoration(
image: new DecorationImage(
image: new ExactAssetImage('assets/lol/aatrox.jpg'),
fit: BoxFit.cover,
),
),
child: new BackdropFilter(filter: new ImageFilter.blur(sigmaX: 600.0, sigmaY: 1000.0)),
width: 400.0,
),
);
}
}
I'm wanting to blur the DecorationImage, so I added a BackdropFilter to the Container, but I don't see any change. What am I doing wrong?
You could do something like this, by blurring the container child instead.
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
home: new Container(
decoration: new BoxDecoration(
image: new DecorationImage(
image: new ExactAssetImage('assets/dog.png'),
fit: BoxFit.cover,
),
),
child: new BackdropFilter(
filter: new ImageFilter.blur(sigmaX: 10.0, sigmaY: 10.0),
child: new Container(
decoration: new BoxDecoration(color: Colors.white.withOpacity(0.0)),
),
),
),
);
}
}
Screenshot:
Using Stack:
SizedBox(
height: 200,
child: Stack(
fit: StackFit.expand,
children: [
Image.asset('chocolate_image', fit: BoxFit.cover),
ClipRRect( // Clip it cleanly.
child: BackdropFilter(
filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
child: Container(
color: Colors.grey.withOpacity(0.1),
alignment: Alignment.center,
child: Text('CHOCOLATE'),
),
),
),
],
),
)
Without using Stack:
Container(
height: 200,
width: double.maxFinite,
decoration: BoxDecoration(
image: DecorationImage(
image: ExactAssetImage("your_chocolage_image"),
fit: BoxFit.cover,
),
),
child: ClipRRect( // make sure we apply clip it properly
child: BackdropFilter(
filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
child: Container(
alignment: Alignment.center,
color: Colors.grey.withOpacity(0.1),
child: Text(
"CHOCOLATE",
style: TextStyle(fontSize: 28, fontWeight: FontWeight.bold),
),
),
),
),
)
As I mentioned here, you should wrap your ImageFiltered widget in a ClipRRect to prevent it from flowing out the widget boundaries. Here's the code:
ClipRRect(
child: ImageFiltered(
imageFilter: ImageFilter.blur(sigmaX: 3, sigmaY: 3),
child: Image.asset('assets/flutter_image.png'),
),
),
This is the output:
ImageFiltered is the perfect widget for that . It creates a widget that applies an ImageFilter to its child.
ImageFilter is an easy way to blur or transform pixels in your app . You can import it from dart:ui
Code :
ImageFiltered(
imageFilter: ImageFilter.blur(sigmaY:5,sigmaX:5), //SigmaX and Y are just for X and Y directions
child: Image.asset('assets/image.png') //here you can use any widget you'd like to blur .
)
ImageFilter.blur() make anything blurry and
ImageFilter.matrix() lets you use any matrix for
transformation ,scaling , translating , skewing and rotating
Output :
A similar widget to ImageFiltered is BackdropFilter .
BackdropFilter lets you apply filter to everything that's painted
beneath a widget , instead of applying the filter to the widget
itself.
It's also less performant . If you can do your effect with
ImageFiltered , Use it instead of BackdropFilter.
You can learn more about ImageFiltered by watching this official video or by visiting flutter.dev
It's better if you put in ClipRRect, like this :
Container(
child: ClipRRect(
child: Stack(
children: <Widget>[
FadeInImage.assetNetwork(
placeholder: placeholder,
image: thumbnail,
fit: BoxFit.cover,
),
BackdropFilter(
child: Container(
color: Colors.black12,
),
filter: ImageFilter.blur(sigmaY: 10, sigmaX: 10),
)
],
),
),
width: double.infinity,
),
This case apply for Image (Thumbnail) list items correctly.
All the above answers are correct, I'll reply to #user123456 here since I can't comment yet.
can i make the BoxDecoration image clickeble – user123456
Just wrap the whole Container with a GestureDetector
GestureDetector(
onTap: () {...},
child: Container(
...
decoration: BoxDecoration(...),
),
);
You can use Image widget. It's very simple.
Image(
image: AssetImage("assets/images/news-media.png"),
color: Colors.black,
colorBlendMode: BlendMode.softLight,
fit: BoxFit.fill,
),