Trying to do something like this in Flutter (I'm totally beginner), I don't get how to nest some widgets... I've tried to put a Row() for floating action buttons and another Row for labels but they aren't aligned centered like the image. Should I use GridView instead? thanks!
You were right, but instead of use two rows use only one Row but with two Columns inside it, also with a row you can determine the position for each child according to the mainAxisAlignment and the crossAxisAlignment, for example to center the content use MainAxisAlignment.center as follows:
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Column(
children: [
FloatingActionButton(
onPressed: (){},
child: Icon(Icons.add),
),
Text(
"Test"
)
],
),
SizedBox(width: 16.0),
Column(
children: [
FloatingActionButton(
onPressed: (){},
child: Icon(Icons.add),
),
Text(
"Test"
)
],
),
],
)
If you want to see a little more about layouts in Flutter you can check the Building layouts tutorial section in the documentation.
Related
I am rendering a standard Table inside a GridView, inside a Flex inside a Row. The 2nd row of the table includes a Button.
When the contents of the first row of the table are above a certain size the clickable region of the button begins to cut off, missing entirely over a certain size.
Note: this is using Flutter Web, I have not tested on Mobile/Desktop.
I have created a minimal reproducible example in an attempt to isolate all logic.
Widget _render() {
return Row(mainAxisSize: MainAxisSize.max, children: [
SizedBox(
width: 900,
height: 900,
child: GridView.count(
crossAxisCount: 2,
children: <Widget>[
Table(border: TableBorder.all(), children: <TableRow>[
TableRow(
children: <Widget>[
TableCell(
child: Text(''),
),
TableCell(
child: SizedBox(
height:
440, //The clickable region of the button begins to be cut off around 430, and stops altogether by 450
))
],
),
TableRow(children: <Widget>[
TableCell(
child: Text(""),
),
TableCell(
child: TextButton(
onPressed: () => {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text("Hi Button"))),
},
child: Text("Hi"))),
])
]),
],
),
),
]);
}
What is causing this effect? I am assuming it is some interaction between the visible container and the Table.
Edit: as suggested by #pskink rendered with debugPaintSizEnabled flag which highlights the problem perfectly. However; how would you fix?
I am new in flutter.
I am following some YouTube videos to learn flutter. After adding a picture in card(home screen) now I want to add two buttons below that picture. how can i do it.
the picture Adding code
body: Center(
child: Card(
child: Column(
children: [Image.asset("assets/image-name")],
),
),
),
Here you have a great page, where you can find implementations of basic material widgets in Flutter.
For your example, it would look like this:
body: Center(
child: Card(
child: Column(
children: [
Image.asset("assets/image-name"),
ElevatedButton(
onPressed: () {
// Respond to button press
},
child: Text('CONTAINED BUTTON'),
)
],
),
),
),
For a second button, you can just add another one in the children array.
You can also wrap both buttons in Row widget, that will allow you to place them horizontally, next to each other.
main issue is i want to add some space between Rows and this Rows are children of SingleChildScrollView, my widget tree :
child: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Row(
// first row with 3 column
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Container(),
Container(),
Container(),
],
),
Row(
// second row also with 3 column ans so on
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Container(),
Container(),
Container(),
//Row( third row also with 3 column ans so on
//Row( fourth row also with 3 column ans so on
// ....
],
),
],
),
),
i got the following out put :
so how to add more space to the widget SingleChildScrollView , so to expect that mainAxisAlignment:MainAxisAlignment.spaceBetween put some space between the rows , or how simply add a space between rows?
Things like SizedBox work great if you are happy with a fixed pixel gap. Spacer is another alternative, and is flexed, which may or may not be what you want, depending on what you have it nested under. If you prefer to work with relative sizes, I can also recommend FractionallySizedBox, which operates on a percentage of the area, and works great for responsive designs. If you wanted to have a 5% vertical gap, for example, you could express this as:
FractionallySizedBox(heightFactor: 0.05),
try between the rows
SizedBox(height:20),
final code
child: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Row(
// first row with 3 column
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Container(),
Container(),
Container(),
],
),
SizedBox(height:20),
Row(
// second row also with 3 column ans so on
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Container(),
Container(),
Container(),
//Row( third row also with 3 column ans so on
//Row( fourth row also with 3 column ans so on
// ....
],
),
],
),
),
Insert a Padding widget.
Row(...),
Padding(padding: EdgeInsets.only(bottom: 10),
Row(...)
You can also use Spacer( ... . )
For me Padding is ok
Row(...),
SizedBox(width:20). // If want horizontal space use width for vertical use height
Row(...)
you can use SizedBox b/w Rows
I have a home/login screen which is made up of a column that fills the entire screen like so:
Column(
children: <Widget>[
Expanded(
child: Container(
child: Logo(),
),
),
showThis ? This() : That(),
],
),
The second child of the column is dynamic and can have different heights, and this screen will have inputs so the keyboard will also affect the height.
I want to center Logo() vertically within the container when it's small (e.g. when keyboard is active), but limit how much the 'top margin' is able to grow, so that when the keyboard is hidden and This()/That() is small enough, Logo() will be in a static position on the screen, say 150 from the top (no longer centred vertically).
One method I have tried was using 2 empty Expanded() above and below Logo() and wrapping the top part in a ConstraintedBox(), but I am not able to get it to behave correctly.
Have you tried with Center() and also if you wanna in a specific position use Stack, for example
Stack(
children: <Widget>[
showThis(),
Positioned(top: 150, child: Logo())
],
)
This is what ended up working for me:
Column(
children: <Widget>[
Expanded(
child: Column(
children: <Widget>[
// constrain top spacing with a max height
Flexible(child: Container(height: 160)),
_logo(),
Spacer(),
],
),
),
_bottomWidget(),
],
),
I'm creating a card game and my UI has a Column() with various combinations of children widgets. One child is a Row
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(),
Container(),
],
),
The Container() widgets each display what looks like playing cards. They have BoxDecorationsto provide a border + a child that's a Row(). The Row's children display a number (text) and a suit (image).
I would like to flash text over the two playing cards, something that's visible for just a couple seconds, e.g., "Well done." Although I'm always open to help, I assume this will amount to (Rich)Text() widgets and some sort of timer or Duration object, and that I can figure it out.
What I'm struggling with is figuring out how to create a text overlay that is both on top of and spans the two images. Do I have to do something like wrap the higher level Row() object in a Stack()? I hate all that nesting, plus I don't know how to have the text always be on top of everything else.
I think you are looking for Overlay widget:
Scaffold(
body: Container(child: Overlay(initialEntries: [
OverlayEntry(builder: (_) => Image.network("https://source.unsplash.com/random", fit: BoxFit.cover,)),
OverlayEntry(builder: (_) => Center(child: Text("Overlay", style: TextStyle(color: Colors.yellow),))),
])),
),
For now I am going with (pseudocode):
Stack(
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(),
Container(),
],
),
Center(
child: Text(),
),
],
),
With the Row() centered and the child:Text() centered, everything lines up and looks good. I do, however, think I need to spend time and learn about Positioned() widgets. I think that will ultimately be a better solution.