I want a CircleAvatar over an Image so I created a stack, its children are an Image and an Align (CircleAvatar inside).
All seems works but I can't move the CircleAvatar on the y-axis, only on the x-axis and I really need to move it on the y-axis.
Code :
body: new Stack(
children: <Widget>[
new ListView(
children: <Widget>[
new Stack(
children: <Widget>[
new Image.asset('assets/images/io.png',
fit : BoxFit.contain,
),
new Align(
alignment: Alignment(0,0),
child: new CircleAvatar(
minRadius: 50,
maxRadius: 50,
child : ClipRRect(
borderRadius: new BorderRadius.circular(50),
child : _profPicture == null
? new Image.asset('assets/images/empty_profile.jpg')
: _profPicture,
),
),
),
],
),
],
),
],
),
If I change the values inside "Alignment" I can move only the avatar from the left to the right, top-bottom doesn't work.
Instead of Align Widget, you should use Positioned Widget
Positioned(
top: 30,
right: 30,
child: new CircleAvatar(.....)
I had the same issue. Solved by specifying child container height and width that need to be aligned. The problem was I only specified width. So height matched to the parent. So no movement on y axis
Related
I am trying to implement a Column within a parent, but the first child of the Column should be centered vertically within the Column's parent, by using MainAxisAlignment.center the whole Column will be centered and if I have more than one child in the Column, the first child won't be in the center.
Here is what i have tried.
child: CircleAvatar(
radius: 146,
backgroundColor: Colors.black87,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('11:06',
style: TextStyle(
fontSize: 70,
)),
Icon(Icons.restart_alt),
],
),
),
Here is what i got.enter image description here
As you see the text is not in the center because the icon pushes it up a bit.
You can wrap your column in another column containing an Expanded widget followed by your column, also wrapped in an Expanded widget.
You can use some padding. I am not aware of a way to get the size of the parent and do like 50% of it like in CSS so you have to keep that in mind. However you can make calculations relative to the viewport height with MediaQuery.of(context).size.height.
Use Align inside Stack (not perfect, still needs adjustment).
CircleAvatar(
...
child: Stack(
alignment: Alignment.center,
children: const [
Text('11:06', style: TextStyle(fontSize: 70)),
Align(
alignment: Alignment(0, 0.4),
child: Icon(Icons.restart_alt),
),
],
),
)
I am trying to get a text label with graphics over the image. Labels like new arrival, best seller, limited, on sale just like on the pic attached.
enter image description here
Here's what i think the skeletal layout would be :
return Stack(
children: [
Card(
color: Colors.black54,
child: Image.asset('assets/xyz.png'),
),
Align(
//for bottomRight
alignment: Alignment.bottomRight,
child: Image.asset(
'assets/fireimg.png',
), //can be an SVG converted to png
),
Align(
//for topLeft
alignment: Alignment.topLeft,
child: Image.asset(
'assets/label.png',
), //can be an SVG converted to png
),
],
);
Feel free to give the Padding of your choice.
it has so much code to write , so i will give some examples to achieve that output
in this image ,i mentioned 0 and one .
for all 1
solution 1
you can use image like this way
Stack(
children: [
Container(
width: 200,
height: 200,
color: Colors.amber,// added only for view this example
child:Image() // add Product image here
),
Positioned(
top: 20, //change according to your use case position
left: 0,// change according to your use case position
child: Container(
color: Colors.black, // added only for view this example
decoration: BoxDecoration(image: ),// add label image here
width: 100,
height: 50,
child: Row(
children: [Text('hi')],
),
))
],
)
solution 2
you can use custom paint for label layout
not that
in both solution you have to use stack and position widgets , you can control position according to your use case
for all 0
you can use RotationTransition widgets to achieve this
not that
you have to use stack and position widgets , you can control position according to your use case
for the vertical Text
use this example
String exText = "meta";
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('hi'),
),
body: Container(
width: 200,
height: 200,
color: Colors.amber,
child: Column(
children: exText.characters
.map((e) => Container(
child: Text('$e'),
))
.toList()),
),
out put will be
I have 2 widget in stack. One of them is aligned in center. And the widget which is on the top is other stack. And I want show second widget with first widget's top and left position. Here is the explain:
The yellow area is my stack. And first widget is setted like Center(child: myFirstWidget). My second widget is referenced from here it's a resizable widget so it's an another stack and it's childs are "positioned". So I need to set top and left value for initialize. But my main stack filled page So when I set my second widget's top and left to 0. It's shown as below.
But I want to show align it to centered child's top like:
My code snip:
child: Container(
color: Colors.red,
child: Stack(
children: [
Center(
child: Image.file(
File("myfilepath"),
),
),
ResizableWidget(
child: Container(
color: Colors.blue,
),
),
],
),
),
You can adjust the position of the widgets with the Position widget like this:
Positioned(
child: ResizableWidget(
child: Container(
color: Colors.blue,
),
),
top: 80,
right: -5,
),
The value of top and right are just random values, you should check what works for you!
You should make Center the parent of the Stack.
The Stack will be positioned at the center of its parent because of Center, it will get the dimensions of its biggest childs (height and width) and will position other childs according to the alignment value.
Edit : I modified the code to include a placeHolder image. Here I gave it a 6000x2000 size but you can change it to whatever value you want. Code is working as expected, see capture below.
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Center(
child: Stack(
alignment: AlignmentDirectional.topStart,
children: [
Image.network('https://via.placeholder.com/6000x2000'),
SizedBox(
height: 50,
width: 50,
child: Container(
color: Colors.green,
))
],
),
),
);
}
I want to overlap the bottom edge of a widget with another widget so that it looks like this:
I am using a stack to position the arrow button over the card. At the moment I just set the position with an invisible box above it. The issue is that this method only works for that exact resolution - it should be screen size independent.
The necessary code for the widget:
Stack(
children: <Widget>[
Container( //background
height: 100,
width: 100,
),
FloatingActionButton(
child: Icon(Icons.arrow_forward),
onPressed: () {},
)
],
)
Update - April 2021
You can no longer use the overflow property in a Stack widget as it has been deprecated. Use clipBehaviour instead. Source: Flutter docs
You can use the Stack and Positioned widget to achieve this UI.
Stack(
clipBehavior: Clip.none,
children: <Widget>[
Container(
color: Colors.amber,
height: 150,
width: 150,
),
Positioned(
child: FloatingActionButton(
child: Icon(Icons.add),
onPressed: () {
print('FAB tapped!');
},
backgroundColor: Colors.blueGrey,
),
right: 0,
left: 0,
bottom: -26,
),
],
),
Output:
Update - March 2022
The Area which is outside of Stack won't be clickable due to the platform limitation, and that is how the Stack widget works.
You can learn more about the same in this issue.
As of November 2019 I'd like to add a second solution:
Using package: https://pub.dev/packages/assorted_layout_widgets
var widget1 = ...;
var widget2 = ...;
ColumnSuper(
children: [widget1, widget2],
innerDistance: -26,
);
The difference from this solution to the one using Stack is that Positioned widgets in a Stack don't occupy vertical space. However, the ColumnSuper will have the size of all of its children widgets. Note I am the author of this package.
You could try my package (signed_spacing_flex). It's exactly the same as a normal Column (or Row and Flex). But it lets you set negative spacing which causes its children to overlap. You can also set which children should be on top when they overlap.
In your case it would be something like:
SignedSpacingColumn(
spacing: -16.0,
stackingOrder: StackingOrder.lastOnTop,
children: [
Container(
height: 100,
width: 100,
color: Colors.red,
),
FloatingActionButton(
child: const Icon(Icons.arrow_forward),
onPressed: () {},
)
],
)
It works with expanded children if you need.
I'm creating a new widget that displays some bubbles, that should be connected by lines.
5-------6
|
4-------3
|
1-------2
I chose a ListView as the outer widget, if I understood it correctly this should give me the scrollability:
return Expanded(
child: ListView(
children: _createLWItems(_createBubbles()),
),
);
Children is a List of my inner widget. Each widget is a row, so I can place two bubbles next to each other:
return Container(
child: Row(
children: <Widget>[
Container(
child: bubbleItem1,
alignment: Alignment.centerLeft,
),
Container(
child: bubbleItem2,
alignment: Alignment.centerRight,
)
],
),
decoration: BoxDecoration( //TODO remove after testing
shape: BoxShape.rectangle,
border: Border.all(color: Colors.blue),
),
);
BubbleItem is only a Container with a BoxDecoration wrapped with a GestureDetector.
What I wanted to achieve is, that the left bubble is aligned to the left, and the right to the right, but instead, both are placed next to each other to the left, although row takes the entire width of my screen, as you can see (blue border):
As I read here there is a MainAxisAlignment for the row-widget but this would just align all childs left, right, centered, etc., not what I have in mind.
How can I place those bubbles the way I intend to?
If they are placed correctly I want to connect them with lines. Is there a way to do this without calculation? My idea would be to insert another widget between the bubbles that takes a line, but I'd need to tell it somehow, that it should take the entire space between the bubbles of his row.
At the moment I'm a bit unsure if I should calculate anything because I read something about 'you cannot calculate before it is rendered', but on the other hand I'm missing some understanding how to do it in flutter without it.
Alignment does work for Row children, but not in the way that you are expecting. If for example you had a Row child with half the height of the Row, you could use Alignment to specify if you want that child at the top or the bottom of the Row - the default is centered.
By default, the children are positioned sequentially within a Row (horizontally) as well as within a Column (vertically), which is what you've got in the screenshot you attached. If you simply wanted to position the 2 circles at the left and right ends of the Row, you could use a MainAxisAlignment value of spaceBetween, which places the free space evenly between the children.
If you want to also draw a line between the circles however, then you will not have any space left to distribute within the Row, so the MainAxisAlignment will not help. What you want instead is an Expanded widget within the Row, between the circles. This will create a widget that takes up all the remaining space within the Row, which is where you want your line to be.
Row(
children: <Widget>[
Container(
child: bubbleItem1,
alignment: Alignment.centerLeft,
),
Expanded(
child: Divider(),
),
Container(
child: bubbleItem2,
alignment: Alignment.centerRight,
)
],
)
You are giving the Alignment to the container's item, not the container itself
Try giving the Alignment to the Row
Container getContainer(){
return Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Container(
height: 50,
width: 50,
child: Center(child: Text("Left")),
),
Container(
height: 50,
width: 50,
child: Center(child: Text("Right")),
)
],
),
decoration: BoxDecoration( //TODO remove after testing
shape: BoxShape.rectangle,
border: Border.all(color: Colors.blue),
),
);
}