I'm new to flutter and have been trying to get a list of chipsets wrapped in a Wrap widget with the ability to add more of them through a button shown in the image. However, the button isn't able to wrap along with the chipset horizontally. Below is an image of the design to make it clearer.
Code:
Container(
child: Wrap(
children: [
Container(
child: Wrap(
children: _chipsetList,
),
),
SizedBox(width: 2),
Container(
height: 35,
width: 35,
child: FittedBox(
child: FloatingActionButton(
heroTag: null,
elevation: 0,
shape: StadiumBorder(
side: BorderSide(width: 2.0)),
onPressed: () {
_getMoreChips(context);
},
child: Icon(Icons.add),
),
))
],
),),
I tried to experiment with SingleChildScrollView property or with Wrap direction but in vain. What could be a way to get this design working?
Seems you want to put chips and the button in the single wrap. To do so, combine them in a single list and use this list as wrap's children
List<Widget> items = List.from(_chipsetList); // copy
Widget button = FloatingActionButton();
items.add(button);
Wrap(
children: items,
)
Or, using spread operator
Wrap(
children: [
..._chipsetList,
FloatingActionButton(),
],
)
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 have a SingleChildScrollView and inside it I have a list with some cards, that you can remove ou add more. I need to fix an add button at the bottom of the screen, when the card list is not scrollable yet, but when the card list increase size and the scrollview is able to scroll now (to see all the content), the button must follow the list and not keep fixed at the bottom anymore.
For now, what I did to solve this, was check the scroll view every time that a card is added ou removed, if I checked that the screen is now scrollable or not scrollable I change some properties of my build widget:
SingleChildScrollView(
controller: _scrollController,
physics: AlwaysScrollableScrollPhysics(),
child: Container(
height: isNotScrollable
? _pageSize - (_appBarSize + _notifySize)
: null,
padding: const EdgeInsets.symmetric(
horizontal: Constraints.paddingNormal),
child: Column(
.....
and after the list render I create the button like this
isNotScrollable
? Expanded(
child: Container(),
)
: Container(),
CVButton(
color: Palette.white,
Basically, my idea is: if the screen is not scrollable yet (the list content fits in the screen size) I will set a height to the container inside scrollview and add a Expanded() widget before the add button (so the button will stay in the bottom of the container), but if the screen is scrollable (the list content not fits inside the screen size) so I remove the container height and the Expanded widget, then the button will follow the list now as normally.
I don't know if this is the better way to deal with that, I want to know if there is some way to do this without this 'dinamic' way that I am doing, only with fixed widgets and not changing the widget according to the state of the scrollview.
An example when the list becomes scrollable and the button will keep at list bottom
Here the list is not scrollable yet but the button must be at the screen bottom and not list bottom
(I dont wanna use bottomNavBar)
Anyone has any idea how I can solve this?
I have a solution for this. check the code bellow. I added some buttons to add or remove cards. The main trick is to use constraints like minHeight.
import 'package:flutter/material.dart';
class BottomButton extends StatefulWidget {
#override
_BottomButtonState createState() => _BottomButtonState();
}
class _BottomButtonState extends State<BottomButton> {
List<Widget> cards = [];
#override
Widget build(BuildContext context) {
var appBar2 = AppBar(
actions: [
IconButton(
icon: Icon(Icons.add),
onPressed: () {
_addCard();
}),
IconButton(
icon: Icon(Icons.remove),
onPressed: () {
_removeCard();
}),
],
);
return Scaffold(
appBar: appBar2,
body: Container(
height: MediaQuery.of(context).size.height -
(MediaQuery.of(context).padding.top + appBar2.preferredSize.height),
alignment: Alignment.topCenter,
child: ListView(
primary: true,
children: [
Container(
constraints: BoxConstraints(
minHeight: MediaQuery.of(context).size.height -
(MediaQuery.of(context).padding.top +
appBar2.preferredSize.height),
),
alignment: Alignment.topCenter,
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Container(
constraints: BoxConstraints(
minHeight: MediaQuery.of(context).size.height -
(MediaQuery.of(context).padding.top +
appBar2.preferredSize.height +
50),
),
alignment: Alignment.topCenter,
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.start,
children: cards,
),
),
ElevatedButton(
child: Text('this is a button'),
onPressed: () {},
),
],
),
)
],
),
),
);
}
void _addCard() {
Widget card = Card(
child: Container(
height: 100,
color: Colors.red,
padding: EdgeInsets.all(2),
),
);
setState(() {
cards.add(card);
});
}
void _removeCard() {
setState(() {
cards.removeLast();
});
}
}
I have created the following RaisedButton in Flutter:
The problem is, the button's highlightElevation triggers when you press and hold the button for approximately 1 second when I have the image shown on the left of it, but when I remove the image, it works as intended.
Is there a way to fix this while keeping the image?
here is my code:
Widget systems(String systemName, String systemTitle, Image img) {
return Center(child:
Container( width:width-20,height:110,child:
Column( children: <Widget>[
SizedBox(height: 10),
RaisedButton( elevation: 10,splashColor: Colors.transparent,highlightElevation: 0, shape:
RoundedRectangleBorder(
borderRadius: BorderRadius.circular(18.0),
),
color: Colors.white,
onPressed: () {},
child: Padding(
padding: EdgeInsets.only(left:0,top:15,bottom:15),
child: Row(children: [
img,Container(width:width-120,child:
Align(
alignment: Alignment.center,
child: Column(
children: [
Text(systemName, style: TextStyle(fontSize: 18)),
],
),
),)
])))
])));
}
PS: I have called this widget 9 times within a for loop in another widget, and when I reduce the number of the loop to 5 or lower, the button works as intended as well.
According to Flutter SDK highlightElevation is for the button's Material when the button is enabled and pressed.
Please refer https://api.flutter.dev/flutter/material/RawMaterialButton/highlightElevation.html
highlightElevation property :
The elevation for the button's Material when the button is enabled and pressed.
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 would like to have a static bottom bar for my app.
This bar should content the hour of a device in the middle, and the temperature read by another device on the right side.
My problem is just about the positioning/sizing.
When I start it (with android studio, on real or virtual device), it doesn't work : the preview is not what I excepted, the dimensions I choose seem to have changed.
But when I hot-reload it, it becomes exactly what I want like this :
The problem is that the final app is not the hot-reloaded one ..
I may have identify the problem,
I use a MediaQuery.of(context).size and a builder to obtain the context in order to fit with all the devices considering the size. This solution must be a dirty one but I don't find anything else..
Here is my code, hope the situation is clear...
return new MediaQuery(
data: MediaQueryData.fromWindow(ui.window),
child: Builder(
builder: (context) {
return new Builder(
builder: (
context) {
return
new MaterialApp(
home: new DefaultTabController(
length: 6,
child: Scaffold(
bottomNavigationBar:
new Container(
color: Colors.white,
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height*0.1,
alignment: Alignment.centerRight,
child: new Container(
color: Colors.blue,
width: MediaQuery.of(context).size.width* 2/3,
alignment: Alignment.centerRight,
child: new Row(
children: <Widget>[
new Expanded(child: new Container(
color : Colors.yellow,
child: new Text('22 : 22' ),
alignment: Alignment.center,
)),
new Expanded(child:new Container(
color: Colors.pink,
child: new Text(' 37.8 °C'),
margin: new EdgeInsets.all(MediaQuery.of(context).size.width*0.02),
alignment: Alignment.centerRight,
))
],
),
),
),
Thank you for helping.
You could use a Stack and position one of the widget absolute over the other one:
new Stack(
children: <Widget> [
new Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget> [
new Text(time),
],
),
new Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget> [
new Text(temperature)
],
),
],
),
where time & temperature are variables that were set within the state (Stateful Widgets). Then just include it in bottomNavigationBar.
I eventually added my previous code in a StatelessWidget and call it in the bottomNavigationBar field of the Scaffold : it does the job.
And I call MediaQuery.of(context) within the StatelessWidget created
Thank you.