I am looking to cut the image of the SVG in half. The SVG is the lighter wave at the bottom of the circle. It is currently too high, and I need to reduce the size by about half. I placed the SVG in a container of its own, but modifying the size of the container isn't exactly modifying the size of the image in ways I would expect. Any suggestion are appreciated.
return Container(
decoration: bubbleBoxDecoration,
height: bubbleDiameter.toDouble(),
width: bubbleDiameter.toDouble(),
child: Stack(
children: [
Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Text(
'Upper Body',
style: labelTextStyle,
),
Text(
'45',
style: weightTextStyle,
),
Text(
'lbs',
style: unitTextStyle,
),
],
),
),
Container(
height: bubbleDiameter.toDouble(),
width: bubbleDiameter.toDouble(),
child: SvgPicture.asset(
assetName,
alignment: Alignment.bottomCenter,
),
),
],
),
);
}
}
The key here is the fit parameter. Also, since you want to cut off the bottom and see the top, use Alignment.topCenter.
Container(
height: bubbleDiameter.toDouble() / 2,
width: bubbleDiameter.toDouble(),
child: SvgPicture.asset(
assetName,
fit: BoxFit.fitWidth,
alignment: Alignment.topCenter,
),
),
You can trick the UI while using Stack and make the image size the way you want. You need to resize the image and align properly. The only reason your code-snippet is not reflecting the size because Stack child require a positional widget like Positioned / Align to reflect custom size.
Positioned(
bottom: -100,// bubbleDiameter.toDouble() the way you like to align
child: SvgPicture.asset(
assetName,
height: bubbleDiameter.toDouble() * 2,
width: bubbleDiameter.toDouble() *2,
alignment: Alignment.bottomCenter,
),
),
You cannot modify an asset image in flutter. even if you can, it won't be ideal, because it's an asset, you can remove , edit and add it back, rather than modifying the asset every time you run your app.
Related
How do I align one widget of a column in the center and put the rest around it?
If I had a Container or so that holds the three input fields and the button and another one that is the box above. How do I align the Container in the middle and put the box in the remaining space without moving the center container?
I tried using Expanded or Flexible but couldnt figure out how to align the widgets in that kind of way.
You can use Column like this:
Column(
children: [
Expanded(
child: Align(
alignment: Alignment.bottomCenter,
child: Container(
height: 40,
width: 40,
color: Colors.yellow,
),
)),
Container(
color: Colors.red,
height: 100,
width: double.infinity,
),
Expanded(
child: Align(
alignment: Alignment.topCenter,
child: Container(
height: 40,
width: 40,
color: Colors.green,
),
)),
],
),
The thing I want to reach is something like this:
These are the main constraints I want to reach:
"text"-s being centered above the lower "button"-s and "thing2" being able to go in between "texts"-s when the screen is short enough.
I want the "button"-s to always be the same height/width (this is easily done by something like SizedBox) and the same distance from the top/bottom .
I want the "thing1" to be x height at max and scale with screen downwards if needed (either by making its texts smaller or making it scrollable, I haven't yet decided, this isn't the main problem).
I want "thing2" to always scale with screen.
When the screen is big enough, I want "thing1" and "thing2" to share the space between them evenly, and each being in the center of its own space.
Right now my layout is the following:
Column: MainAxisAlignment.SpaceBetween, height fixed
Container: height fixed
Row: MainAxisAlignment.SpaceBetween
Button
Button
Container: height fixed
thing1
Container: height calculated based on screen height and other Containers' height
thing2
Container: height fixed
Row: MainAxisAlignment.SpaceBetween
Button
Button
This is of course not all, I tried to include all relevant information about my layout without giving too much information pointlessly.
How would one go about adding the "text"-s above the "button"-s? (I tried Stack, but then I dont't know how to make them appear above the "button"-s while at the same time making "thing2" be above them too.
I managed achieve the things with this code (where MyBox is a simple widget with a colored container with width and height):
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
const double buttonHeight = 35;
const double buttonWidth = 100;
const double textHeight = 40;
const double textWidth = 30;
return Padding(
padding: const EdgeInsets.all(8.0),
child: Stack(
children: [
Align(
alignment: Alignment.topLeft,
child: SizedBox(
width: buttonWidth,
height: buttonHeight,
child: MyBox(Colors.red),
),
),
Align(
alignment: Alignment.topRight,
child: SizedBox(
width: buttonWidth,
height: buttonHeight,
child: MyBox(Colors.yellow),
),
),
Align(
alignment: Alignment.bottomLeft,
child: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: SizedBox(
width: textWidth,
height: textHeight,
child: MyBox(Colors.green),
),
),
SizedBox(
width: buttonWidth,
height: buttonHeight,
child: MyBox(Colors.cyan),
),
],
),
),
Align(
alignment: Alignment.bottomRight,
child: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: SizedBox(
width: textWidth,
height: textHeight,
child: MyBox(Colors.indigo),
),
),
SizedBox(
width: buttonWidth,
height: buttonHeight,
child: MyBox(Colors.blue),
),
],
),
),
Align(
alignment: Alignment.bottomCenter,
child: SizedBox(
width: buttonWidth,
height: buttonHeight,
child: MyBox(Colors.orange),
),
),
Positioned(
left: 0,
top: 0,
right: 0,
bottom: buttonHeight,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Flexible(
fit: FlexFit.loose,
child: MyBox(Colors.purple),
),
Flexible(
fit: FlexFit.loose,
child: MyBox(Colors.brown),
),
],
),
),
],
),
);
}
}
TLDR: I used a Stack widget to hold my other widgets, and Align widget to align (duh) my widgets in the Stack.
I used a Column to center my texts above my lower buttons. "mainAxisAlignment: MainAxisAlignment.end" was important so this column is at the bottom and not at the topside.
Finally I wrapped the Stack in a Padding.
So, I have to display an image in a container and some description at the bottom of the container. The image is supposed to fill the entire screen. The image is being fetched from the network.
This is my intial approach
Stack(
fit: StackFit.expand,
children: <Widget>[
Container(
child: ClipRRect(
child: Image.network(category.imageURL,
height: maxHeight * 1, fit: BoxFit.cover),
),
),
Align(
alignment: Alignment.bottomLeft,
child: getNameAndDeleteSection(context),
)
],
),
),
where getNameAndDeleteSection is basically this
return Container(
color: Colors.yellow,
margin: EdgeInsets.fromLTRB(5, 0, 5, 0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Text(
category.name,
maxLines: 1,
style: TextStyle(color: Colors.white),
),
Spacer(),
IconButton(
icon: Icon(Icons.delete, size: 18.0, color: Colors.white,),
onPressed: () {
deleteTap(category);
},
)
],
),
);
}
When the network image is loaded, it hides the yellow container , but keeps the children. What I want is the image to remain at the background and the yellow container to remain above it. The idea is that the yellow container will have a transparent color of sorts , to make it look floating on the image.
The max height is the height provided by the listView. I'm trying to make the UI adaptive. Any help?
Why not puting your image as a BoxDecoration in your container like this:
Stack(
children: <Widget>[
Container(
decoration: BoxDecoration(
image: DecorationImage(
image: NetworkImage(url), fit: BoxFit.cover,
),
),
),
Align(
alignment: Alignment.bottomLeft,
child: getNameAndDeleteSection(context),
)
],
),
Instead of using a Container that always seems to get hidden by the Network Image, I decided to use Card that will envelop the container. And it worked.
So, the change was done in the getNameAndDeleteSection and basically wrapped the entire code in a Card. And bingo, it worked.
Project
Hi,
I was trying to align some widgets inside a Stack in Flutter. My end result was something like:
I know that this can be easily achieved with a Row but I want to animate the position ot the two children so I'm forced to use stack.
My problem is simple:
Example code
return Container(
child: Stack(
children: <Widget>[
Align(
alignment: Alignment.centerLeft,
child: _buildSign(),
),
Align(
alignment: Alignment.centerRight,
child: _buildSign(),
),
],
),
);
This will not render as I expected. No matter what I put in the alignment field: Alignment.centerRight and Alignment.centerLeft will always place the child to the center left.
The problem is solved only if I give a fixed width to the wrapping container. Now I understand why this happend but what if I want the container to be the size of his childrens? Label is a dynamic text so his width is unpredictable for me
Any ideas?
Thanks
Hy justAnotherOverflowUser,
In your case, you have to use Positioned Widget inside Stack Widget,
it will give you what you want.
as example:
Positioned(
left: 20.0,
child: Icon(
Icons.monetization_on,
size: 36.0,
color: const Color.fromRGBO(218, 165, 32, 1.0)
)
)
The more flexible way for such alignment is to wrap Align with Positioned.fill
The original answer was posted here Flutter: bottom center widget in stack
return Container(
child: Stack(
children: <Widget>[
Positioned.fill(
child: Align(
alignment: Alignment.centerLeft,
child: _buildSign(),
),),
Positioned.fill(
child:Align(
alignment: Alignment.centerRight,
child: _buildSign(),
),),
],
),
);
Image of the problem, shown as colored rectangles
I want the first child of Column to be Flexible and the second to take up the entire remaining space. Apparently, this does not work.
I'm now aware that this is the expected behavior. I would appreciate a workaround.
I've tried using FittedBox on the first child instead of Flexible, but it didn't work as the content of the first child has unbounded width.
SizedBox(
height: 300,
width: 50,
child: Container(
color: Colors.black,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Flexible(
child: Container(
height: 100,
color: Colors.red,
),
),
Expanded(
child: Container(
color: Colors.blue,
),
),
],
),
),
);
I want to make the first child (i.e. A TextField) Flexible so that if the height gets too small, there are no ugly yellow-black overflow bars.
Update:
Below image shows what I really want to do, but it has the overflow issue because the first child isn't flexible.
shows what happens when I do use Flexible.
I'm using AnimatedContainer to change the height. I prefer not to use SizeTransition if possible.
Just replace your code with the next one (flexes ratio can be adjusted to the right one):
SizedBox(
height: 300,
width: 50,
child: Container(
color: Colors.black,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Flexible(
flex:1
child: Container(
height: 100,
color: Colors.red,
),
),
Flexible(
flex:10
child: Container(
color: Colors.blue,
),
),
],
),
),
);