When creating a Card (for example using the code from the Docs) , how can I anchor a FAB to the Card (the green circle in the image below), like in this question for Android.
I saw a similar question for attaching a FAB to the AppBar, but the solution relies on the AppBar being a fixed height. When using a Card, the height isn't fixed ahead of time so the same solution can't be used.
You can place the FloatingActionButton in an Align widget and play with the heightFactor property.
For example:
class MyCard extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Card(
child: Column(
children: <Widget>[
SizedBox(height: 100.0, width: double.infinity),
Align(
alignment: Alignment(0.8, -1.0),
heightFactor: 0.5,
child: FloatingActionButton(
onPressed: null,
child: Icon(Icons.add),
),
)
],
),
);
}
}
Correct solution for anchor FAB.
Another solution using stack and container. FAB's place is based on its sibling Container widget's size and clicks/taps work properly.
import 'package:flutter/material.dart';
void main() {
runApp(
MaterialApp(
home: MyWidget(),
),
);
}
class MyWidget extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: <Widget>[
Container(
padding: EdgeInsets.only(bottom: 28),
child: Container(
width: double.infinity,
height: 150,
color: Color.fromRGBO(55, 55, 55, 0.2),
padding: EdgeInsets.all(15),
child: Text(
'Any container with bottom padding with half size of the FAB'),
),
),
Positioned(
bottom: 0,
right: 10,
child: FloatingActionButton(
child: Icon(
Icons.play_arrow,
size: 40,
),
onPressed: () => print('Button pressed!'),
),
),
],
),
);
}
}
CodePan link for anchor FAB
The correct solution is to use a "Stack" and "Positioned" widged like:
return Stack(
children: <Widget>[
Card(
color: Color(0xFF1D3241),
margin: EdgeInsets.only(bottom: 40), // margin bottom to allow place the button
child: Column(children: <Widget>[
...
],
),
Positioned(
bottom: 0,
right: 17,
width: 80,
height: 80,
child: FloatingActionButton(
backgroundColor: Color(0xFFF2638E),
child: Icon(Icons.play_arrow,size: 70,)
),
),
],
);
I want to make this kind of design with these white circles as a raised button.
Try This!
I have added 5 circles you can add more. And instead of RaisedButton use InkResponse.
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(home: new ExampleWidget()));
}
class ExampleWidget extends StatelessWidget {
#override
Widget build(BuildContext context) {
Widget bigCircle = new Container(
width: 300.0,
height: 300.0,
decoration: new BoxDecoration(
color: Colors.orange,
shape: BoxShape.circle,
),
);
return new Material(
color: Colors.black,
child: new Center(
child: new Stack(
children: <Widget>[
bigCircle,
new Positioned(
child: new CircleButton(onTap: () => print("Cool"), iconData: Icons.favorite_border),
top: 10.0,
left: 130.0,
),
new Positioned(
child: new CircleButton(onTap: () => print("Cool"), iconData: Icons.timer),
top: 120.0,
left: 10.0,
),
new Positioned(
child: new CircleButton(onTap: () => print("Cool"), iconData: Icons.place),
top: 120.0,
right: 10.0,
),
new Positioned(
child: new CircleButton(onTap: () => print("Cool"), iconData: Icons.local_pizza),
top: 240.0,
left: 130.0,
),
new Positioned(
child: new CircleButton(onTap: () => print("Cool"), iconData: Icons.satellite),
top: 120.0,
left: 130.0,
),
],
),
),
);
}
}
class CircleButton extends StatelessWidget {
final GestureTapCallback onTap;
final IconData iconData;
const CircleButton({Key key, this.onTap, this.iconData}) : super(key: key);
#override
Widget build(BuildContext context) {
double size = 50.0;
return new InkResponse(
onTap: onTap,
child: new Container(
width: size,
height: size,
decoration: new BoxDecoration(
color: Colors.white,
shape: BoxShape.circle,
),
child: new Icon(
iconData,
color: Colors.black,
),
),
);
}
}
you can use decoration like this :
Container(
width: 60,
height: 60,
child: Icon(CustomIcons.option, size: 20,),
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Color(0xFFe0f2f1)),
)
Now you have circle shape and Icon on it.
More efficient way
I recommend drawing a circle with CustomPainter. It's very easy and way more efficient than creating a bunch of widgets/masks:
/// Draws a circle if placed into a square widget.
/// https://stackoverflow.com/a/61246388/1321917
class CirclePainter extends CustomPainter {
final _paint = Paint()
..color = Colors.red
..strokeWidth = 2
// Use [PaintingStyle.fill] if you want the circle to be filled.
..style = PaintingStyle.stroke;
#override
void paint(Canvas canvas, Size size) {
canvas.drawOval(
Rect.fromLTWH(0, 0, size.width, size.height),
_paint,
);
}
#override
bool shouldRepaint(CustomPainter oldDelegate) => false;
}
Usage:
Widget _buildCircle(BuildContext context) {
return CustomPaint(
size: Size(20, 20),
painter: CirclePainter(),
);
}
I would use a https://docs.flutter.io/flutter/widgets/Stack-class.html to be able to freely position widgets.
To create circles
new BoxDecoration(
color: effectiveBackgroundColor,
image: backgroundImage != null
? new DecorationImage(image: backgroundImage, fit: BoxFit.cover)
: null,
shape: BoxShape.circle,
),
and https://docs.flutter.io/flutter/widgets/Transform/Transform.rotate.html to position the white dots.
I want to create a widget like a CircleAvatar that clips its child when it overflows (CircleAvatar only clip the image, not its child). Can I force a BoxDecoration to clip its child (like overflow: hidden in css)?
Consider I have these:
new Container(
height: 50.0,
alignment: Alignment.bottomCenter,
decoration: new BoxDecoration(
color: Colors.blue,
border: new Border.all(),
borderRadius: new BorderRadius.circular(25.0),
),
child: new Container(
color: Colors.orange,
height: 20.0,
),
)
I want orange box to be contained in blue circle.
There is a ClipOval class that can be used like this:
class ClipExample extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Scaffold(
backgroundColor: Colors.blueAccent,
body: new Center(
child: new CircleAvatar(
backgroundColor: Colors.amberAccent,
child: new ClipOval(
clipper:new MyClipper(),
child: new Container(
color: Colors.red,
height: 10.0,
),
),
),
),
);
}
}
class MyClipper extends CustomClipper<Rect>{
#override
Rect getClip(Size size) {
return new Rect.fromCircle(center: new Offset(0.0,0.0),
radius: 50.0
);
}
#override
bool shouldReclip(CustomClipper<Rect> oldClipper) {
return false;
}
}
Is there any way to show fullscreen image ?
var imagejadwal = new Image.network(
"https://firebasestorage.googleapis.com/v0/b/c-smp-bruder.appspot.com/o/fotojadwal.jpg?alt=media&token=b35b74df-eb40-4978-8039-2f1ff2565a57",
fit: BoxFit.cover
);
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Center(
child: imagejadwal
),
);
in that code, there's space around the image :/
Your problem is that Center will make the image to get it's preferred size instead of the full size.
The correct approach would be instead to force the image to expand.
return new Scaffold(
body: new Image.network(
"https://cdn.pixabay.com/photo/2017/02/21/21/13/unicorn-2087450_1280.png",
fit: BoxFit.cover,
height: double.infinity,
width: double.infinity,
alignment: Alignment.center,
),
);
The alignment: Alignment.center is unnecessary. But since you used the Center widget, I tought it would be interesting to know how to customize it.
Here is a View you wrap around your image widget
Includes a click event which opens up a full screen view of the image
Zoom and Pan image
Null-safety
Dark/Light background for PNGs
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
class ImageFullScreenWrapperWidget extends StatelessWidget {
final Image child;
final bool dark;
ImageFullScreenWrapperWidget({
required this.child,
this.dark = true,
});
#override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
Navigator.push(
context,
PageRouteBuilder(
opaque: false,
barrierColor: dark ? Colors.black : Colors.white,
pageBuilder: (BuildContext context, _, __) {
return FullScreenPage(
child: child,
dark: dark,
);
},
),
);
},
child: child,
);
}
}
class FullScreenPage extends StatefulWidget {
FullScreenPage({
required this.child,
required this.dark,
});
final Image child;
final bool dark;
#override
_FullScreenPageState createState() => _FullScreenPageState();
}
class _FullScreenPageState extends State<FullScreenPage> {
#override
void initState() {
var brightness = widget.dark ? Brightness.light : Brightness.dark;
var color = widget.dark ? Colors.black12 : Colors.white70;
SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.top]);
SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
systemNavigationBarColor: color,
statusBarColor: color,
statusBarBrightness: brightness,
statusBarIconBrightness: brightness,
systemNavigationBarDividerColor: color,
systemNavigationBarIconBrightness: brightness,
));
super.initState();
}
#override
void dispose() {
SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values);
SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
// Restore your settings here...
));
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: widget.dark ? Colors.black : Colors.white,
body: Stack(
children: [
Stack(
children: [
AnimatedPositioned(
duration: Duration(milliseconds: 333),
curve: Curves.fastOutSlowIn,
top: 0,
bottom: 0,
left: 0,
right: 0,
child: InteractiveViewer(
panEnabled: true,
minScale: 0.5,
maxScale: 4,
child: widget.child,
),
),
],
),
SafeArea(
child: Align(
alignment: Alignment.topLeft,
child: MaterialButton(
padding: const EdgeInsets.all(15),
elevation: 0,
child: Icon(
Icons.arrow_back,
color: widget.dark ? Colors.white : Colors.black,
size: 25,
),
color: widget.dark ? Colors.black12 : Colors.white70,
highlightElevation: 0,
minWidth: double.minPositive,
height: double.minPositive,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(100),
),
onPressed: () => Navigator.of(context).pop(),
),
),
),
],
),
);
}
}
Example Code:
ImageFullScreenWrapperWidget(
child: Image.file(file),
dark: true,
)
This is another option:
return new DecoratedBox(
decoration: new BoxDecoration(
image: new DecorationImage(
image: new AssetImage('images/lake.jpg'),
fit: BoxFit.fill
),
),
);
For Image from asset
new Image(
image: AssetImage('images/test.jpg'),
fit: BoxFit.cover,
height: double.infinity,
width: double.infinity,
alignment: Alignment.center,
),
For some reason, the solutions given in the answers here did not work for me. The below code worked for me.
body: Container(
height: double.infinity,
width: double.infinity,
child: FittedBox(child: Image.asset('assets/thunderbackground.jpg'),
fit: BoxFit.cover),
you could try wrapping image.network in a a container with infinite dimensions which takes the available size of its parent (meaning if you drop this container in lower half of screen it will fill the lower half of screen if you put this directly as the body of scaffold it will take the full screen)
Container(
height: double.infinity,
width: double.infinity,
child: Image.network(
backgroundImage1,
fit: BoxFit.cover,
)
);
You can use MediaQuery class if you want to get the precious size of your device and use it to manage the size of your image, here's the examples:
return Container(
color: Colors.white,
child: Image.asset(
'assets/$index.jpg',
fit: BoxFit.fill,
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
alignment: Alignment.center,
),
);
Here is an example of a FadeInImage with another widget overlay using the double.infinity method as in the accepted answer.
class FullScreenImage extends StatelessWidget {
#override
Widget build(BuildContext context) {
//you do not need container here, STACK will do just fine if you'd like to
//simplify it more
return Container(
child: Stack(children: <Widget>[
//in the stack, the background is first. using fit:BoxFit.cover will cover
//the parent container. Use double.infinity for height and width
FadeInImage(
placeholder: AssetImage("assets/images/blackdot.png"),
image: AssetImage("assets/images/woods_lr_50.jpg"),
fit: BoxFit.cover,
height: double.infinity,
width: double.infinity,
//if you use a larger image, you can set where in the image you like most
//width alignment.centerRight, bottomCenter, topRight, etc...
alignment: Alignment.center,
),
_HomepageWords(context),
]),
);
}
}
//example words and image to float over background
Widget _HomepageWords(BuildContext context) {
return Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
InkWell(
child: Padding(
padding: EdgeInsets.all(30),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Padding(
padding: EdgeInsets.fromLTRB(0, 40, 0, 12),
child: Image.asset(
"assets/images/Logo.png",
height: 90,
semanticLabel: "Logo",
),
),
Text(
"ORGANIZATION",
style: TextStyle(
fontSize: 24,
fontWeight: FontWeight.bold,
color: Colors.white),
),
Text(
"DEPARTMENT",
style: TextStyle(
fontSize: 50,
fontWeight: FontWeight.bold,
color: Colors.white),
),
Text(
"Disclaimer information...",
style: TextStyle(
fontSize: 12,
fontWeight: FontWeight.bold,
color: Colors.white),
),
],
),
),
onTap: () {
//to another screen / page or action
},
),
],
);
}
Use the below code if height: double.infinity, width: double.infinity, doesn't work to u.
class SplashScreen extends StatefulWidget {
#override
_SplashScreenState createState() => new _SplashScreenState();
}
class _SplashScreenState extends State<SplashScreen> {
#override
void initState() {
super.initState();
Timer(Duration(seconds: 30),()=>Navigator.push(
context, MaterialPageRoute(builder: (context)=>Login())));
}
#override
Widget build(BuildContext context) {
return new Scaffold(
//backgroundColor: Colors.white,
body: Container(
child: new Column(children: <Widget>[
new Image.asset(
'assets/image/splashScreen.png',
fit: BoxFit.fill,
// height: double.infinity,
// width: double.infinity,
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height,
alignment: Alignment.center,
repeat: ImageRepeat.noRepeat,
),
]),
),
);
}
}