I'm trying to set up a background color for a Row() widget, but Row itself has no background color or color attribute. I've been able to set the background color of a container to grey, right before the purple-backgrounded text, but the text itself does not fill the background completely and the following spacer does not take any color at all.
So how can I have the Row background set to the "HexColor(COLOR_LIGHT_GREY)" value so it spans over the whole row?
Any idea? Thanks a lot!
Here's the code that I have so far:
import 'package:flutter/material.dart';
import '../manager/ShoppingListManager.dart';
import '../model/ShoppingListModel.dart';
import '../hexColor.dart';
import '../Constants.dart';
class ShoppingListWidget extends StatelessWidget {
final Color color = Colors.amberAccent;
final int shoppingListIndex;
ShoppingListWidget({this.shoppingListIndex});
@override
Widget build(BuildContext context) {
ShoppingListManager slm = new ShoppingListManager();
String shoppingListName =
slm.myShoppingLists.shoppingLists[shoppingListIndex].name;
int categoryCount =
slm.myShoppingLists.shoppingLists[shoppingListIndex].categories.length;
return Scaffold(
appBar: AppBar(
title: Text(shoppingListName),
automaticallyImplyLeading: true,
),
body: ListView.builder(
itemBuilder: (context, index) {
Category cat = slm.myShoppingLists.shoppingLists[shoppingListIndex]
.categories[index];
return Container(
decoration: new BoxDecoration(
border: new Border.all(color: Colors.grey[500]),
color: Colors.white,
),
child: new Column(
children: <Widget>[
getCategoryWidget(context, cat),
getCategoryItems(context, cat),
],
),
);
},
itemCount: categoryCount,
),
);
}
// Render the category "headline" row where I want to set the background color
// to HexColor(COLOR_LIGHT_GREY)
Widget getCategoryWidget(BuildContext context, Category cat) {
return new Row(
children: <Widget>[
new Container(height: 40.0, width: 10.0, color: HexColor(cat.color)),
new Container(
height: 40.0, width: 15.0, color: HexColor(COLOR_LIGHT_GREY)),
new Container(
child: new Text("Category", textAlign: TextAlign.start,
style: TextStyle(
fontFamily: 'Bold',
fontSize: 18.0,
color: Colors.black),
),
decoration: new BoxDecoration(
color: Colors.purple,
),
height: 40.0,
),
Spacer(),
CircleAvatar(
backgroundImage:
new AssetImage('assets/icons/food/food_settings.png'),
backgroundColor: HexColor(COLOR_LIGHT_GREY),
radius: 15.0,
),
new Container(height: 15.0, width: 10.0, color: Colors.transparent),
],
);
}
// render the category items
Widget getCategoryItems(BuildContext context, Category cat) {
return ListView.builder(
itemBuilder: (context, index) {
String itemName = "Subcategory";
return new Row(children: <Widget>[
new Container(height: 40.0, width: 5.0, color: HexColor(cat.color)),
new Container(height: 40.0, width: 20.0, color: Colors.white),
new Container(
child: new Text(itemName),
color: Colors.white,
),
Spacer()
]);
},
itemCount: cat.items.length,
shrinkWrap: true,
physics:
ClampingScrollPhysics(),
);
}
}
Just wrap your Row with a Container with colour property like below:
Container(
color: Colors.black,
child: Row(
children: <Widget>[
Expanded(
child: Text('Demo', style: TextStyle(color: Colors.white),),
)
],
),
)
Update:
Since Flutter 2.0, the Container
is optimized and give the same performance as a regular ColoredBox
.
Wrap your Row
in a Container
and give it a color
.
Container(
color: Colors.red,
child: Row(children: []),
)
Old:
Use ColoredBox
instead of a Container
for more efficiency.
Using Container results in a widget heirarchy that uses a BoxDecoration to actually paint the background color. The BoxDecoration widget covers many cases other than just painting a background color, and is not as efficient as the new ColoredBox widget, which only paints a background color. Source
ColoredBox(
color: Colors.red,
child: Row(children: []),
)
You can try this, it will work.
return DataRow.byIndex(
index: row.key,
color: MaterialStateColor.resolveWith(
(states) {
if (row.key % 2 == 0) {
return Colors.blue[50];
} else {
return Colors.white;
}
},
),
I use my own custom row and column with so may customizable options:
Widget column({
final EdgeInsets padding = EdgeInsets.zero,
final EdgeInsets margin = EdgeInsets.zero,
final List<Widget> children = const <Widget>[],
final MainAxisAlignment mainAxisAlignment = MainAxisAlignment.start,
final MainAxisSize mainAxisSize = MainAxisSize.max,
final CrossAxisAlignment crossAxisAlignment = CrossAxisAlignment.center,
final VerticalDirection verticalDirection = VerticalDirection.down,
final BoxDecoration? decoration,
final double? width,
final double? height,
final bool isScrollable = false,
final VoidCallback? onTap,
}) =>
Container(
width: width,
height: height,
decoration: decoration,
padding: padding,
margin: margin,
child: isScrollable
? SingleChildScrollView(
child: Column(
mainAxisAlignment: mainAxisAlignment,
mainAxisSize: mainAxisSize,
crossAxisAlignment: crossAxisAlignment,
verticalDirection: verticalDirection,
children: children,
),
)
: GestureDetector(
onTap: onTap,
child: Column(
mainAxisAlignment: mainAxisAlignment,
mainAxisSize: mainAxisSize,
crossAxisAlignment: crossAxisAlignment,
verticalDirection: verticalDirection,
children: children,
),
),
);
Widget row({
final EdgeInsets padding = EdgeInsets.zero,
final EdgeInsets margin = EdgeInsets.zero,
final List<Widget> children = const <Widget>[],
final MainAxisAlignment mainAxisAlignment = MainAxisAlignment.start,
final MainAxisSize mainAxisSize = MainAxisSize.max,
final CrossAxisAlignment crossAxisAlignment = CrossAxisAlignment.center,
final VerticalDirection verticalDirection = VerticalDirection.down,
final BoxDecoration? decoration,
final double? width,
final double? height,
final bool isScrollable = false,
final VoidCallback? onTap,
}) =>
Container(
width: width,
height: height,
decoration: decoration,
padding: padding,
margin: margin,
child: isScrollable
? SingleChildScrollView(
child: Row(
mainAxisAlignment: mainAxisAlignment,
mainAxisSize: mainAxisSize,
crossAxisAlignment: crossAxisAlignment,
verticalDirection: verticalDirection,
children: children,
),
)
: GestureDetector(
onTap: onTap,
child: Row(
mainAxisAlignment: mainAxisAlignment,
mainAxisSize: mainAxisSize,
crossAxisAlignment: crossAxisAlignment,
verticalDirection: verticalDirection,
children: children,
),
),
);
You can simply use ListTile and set the tile color like:
return const ListTile( title: Text('This is a text'), tileColor: Colors.lightBlue, );
It will change the color of whole row in a ListView
Or you can also add a BoxDecoration to the TableRow.
Then add the background color as the color property to the BoxDecoration on the TableRow.
Table(
border: TableBorder.all(),
children: pairs
.asMap()
.map((index, pair) => MapEntry(
index,
TableRow(
decoration: BoxDecoration(
color: Theme.of(context)
.accentColor // Background color for the row
.withOpacity(index % 2 == 0 ? 1.0 : 0.5), // To alternate between dark and light shades of the row's background color.
),
children: [
Padding(
padding: const EdgeInsets.all(kDefaultMargin / 2),
child: Text(
pair.first,
),
),
Padding(
padding: const EdgeInsets.all(kDefaultMargin / 2),
child: Text(pair.second),
)
])))
.values
.toList()
);
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