I'm trying to have one of the columns of a PaginatedDataTable be a MaterialButton that can transition when click to another screen
I am traying to add MaterialButton but when run app the button is not appear
can you help me to find the issue?
MaterialButton column
final Widget details;
Ad(
'test',
3,
1,
'',
'34',
'44',
MaterialButton(onPressed: (){},child: const Text("Button"),),
)
DataCell(
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
dessert.details,
MaterialButton(onPressed: (){},child: const Text("Button"),),
],
),
),
Related
When my Expanded widget has expanded there are 20 items, which cause a vertical overflow issue. How do I get the contents within Expanded widget to scroll? I've tried wrapping the content in a SinglechildScrollView but it still didn't allow scrolling.
Scaffold(
key: key,
appBar: customappbar,
body: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.start,
children: [
ExpansionTile(
title: Text(
"${_getcurrentselection(context)}:",
style: const TextStyle(fontSize: 16),
),
children: <Widget>[
for (Map<String, dynamic> submenuitemdata in subMenuItems)
Padding(
padding: const EdgeInsets.only(bottom:10.0),
child: SubmenuItem(submenuitem: submenuitemdata),
),
Expanded(
child: WebViewWidget(controller: controllerGlobal),
),
],
),
],
),
),
Try putting your widgets inside a ListView which should be inside the Expanded.
I couldn't find a suitable solution sa the Expanded widget below the ExpansionTile widget kept throwing errors no matter what I tried. Instead I placed both inside a Stack, so that the ExpansionTile expands over the top of any other widgets.
Also, minus 2 was a bit harsh
I am facing error in the Text widget which is in Column.
body: Padding(
padding: const EdgeInsets.all(20),
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
widget.songModel.displayNameWOExt, <------- here is my text
),
Text(
widget.songModel.artist.toString(),
overflow: TextOverflow.fade,
),
],
),
],
), ), );
This is what happened to me
This is what i need look like
Wrap the Text that is inside a Row widget with an Expanded widget:
Expanded(child: Text(/* Here the text*/),
wrap the text with the container and give a specific size to the container after that use overflow: TextOverflow.fade or any other property of "overflow", because these properties only work when you give a size to textfield but you cant give size to textfield so wrap it with container.
try embedding the Text() widget inside a Expanded() widget expanded documentation
Expanded is a widget that expands a child of a Row, Column, or Flex so that the child fills the available space.
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'm already losing sleep over this.
I'm trying to display a chart inside a ListView (for scrolling). For some reason the contents of the Card flickers when scrolling and randomly completely disappears (the Card itself stays visible though).
Any idea why would that happen?
(...) ListView (...)
children: [Row ( children: [buildChartBox()] )] (...)
Expanded buildChartBox() {
return Expanded(
child: Card(
child: Padding(
padding: const EdgeInsets.all(20.0),
child: Column(
children: [
Column(
mainAxisSize: MainAxisSize.min,
children: [
chartTitles(
title: 'Items',
subtitle: 'by value'),
SizedBox(
height: 300,
child: ValuesChart(data: calculateValues(items)))
],
),
],
),
),
),
);
}
Row chartTitles({String title = '', String subtitle = ''}) {
return Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(title, style: text_charttitle),
Text(subtitle, style: text_chartsubtitle),
],
)
],
);
}
Things tried:
Both of these were originally Stateless Widgets; I changed to simple
methods to simplify but it didn't change the weird behaviour.
Replacing the chartTitles return with an empty Container (i.e. removing the titles) does mitigate the issue. The chart then stays displayed but also flickers slightly.
Replacing the ListView with a SingleChildScrollView doesn't change anything.
EDIT: Code for the ValuesChart:
import 'package:fl_chart/fl_chart.dart';
class ValuesChart extends StatelessWidget {
final Map<String, int> data;
const ValuesChart({required this.data});
#override
Widget build(BuildContext context) {
return Container(
child: PieChart(
_theData(data),
));
}
}
Note I'm using a package called 'fl_chart'. _theData just returns various parameters for the chart, I don't think it's relevant.
Try to replace ListView with SingleChildScrollView
ListViews in flutter by default using what it is called in Android RecyclerView to efficiently use render resources.
If you are interested here an article
https://medium.com/1mgofficial/how-recyclerview-works-internally-71290de5d2c4
How to place a Widget below fixed Centered Widget inside a Container? I am using a GridView to show widgets horizontally. GridView item will have a Text Widget which has to be fixed at the Centered everytime in the screen. I have to place a Text widget below that Centered Widget.
Reference Screenshot:
Adding the build method code of the GridView item I have tried till now. But the Text Widget is not getting centered. The output I am getting. How to fix this part ?
#override
Widget build(BuildContext context) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
CustomText(
(dayModel?.date?.day ?? "").toString(),
AppTextStyle.Body,
customColor: _getColorBasedOnStyle(
dayModel.style,
),
),
Visibility(
visible: dayModel?.style == CalendarDayStyles.NOT_AVAILABLE,
child: CustomText(
Strings.no_slots_label,
AppTextStyle.SublineForCalendar,
customColor: AppColors.BLACK_20,
),
),
],
);
}
I believe the secret to doing this right is not only in how you build "6", but also in how you build "5" and "7".
E.g. you could build every one of them as column with 3 boxes on top of each other, pseudocode:
Column(
children: [
SizedBox(height: fixedHeight, child: empty)
SizedBox(height: fixedHeight, child: Text("5")) // or "6" or "7"
SizedBox(height: fixedHeihgt, child: empty) // or booking status
]
)
or other way of doing it if we have to avoid using fixedHeight is by using the Expanded Widget inside the Column Widget
Column(
children: [
Expanded(child: Container()),
Expanded(child: Center(child : Text("5"))), // or "6" or "7"
Expanded(child: Center(child : Text("No Slots"))) // or booking status
]
)
If you set crossAxisAlignment of the row to start and then show a column with "no slots" underneath, shouldn't this fix your issue?
You could use the CrossAxisAlignment.center:
Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
),
Full snippet code:
#override
Widget build(BuildContext context) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
CustomText(
(dayModel?.date?.day ?? "").toString(),
AppTextStyle.Body,
customColor: _getColorBasedOnStyle(
dayModel.style,
),
),
Visibility(
visible: dayModel?.style == CalendarDayStyles.NOT_AVAILABLE,
child: CustomText(
Strings.no_slots_label,
AppTextStyle.SublineForCalendar,
customColor: AppColors.BLACK_20,
),
),
],
);