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far off in the distant background. This effect is
known as parallax.In this recipe, you create the parallax effect by building
a list of cards (with rounded corners containing some text).
Each card also contains an image.
As the cards slide up the screen,
the images within each card slide down.The following animation shows the app’s behavior:<topic_end>
<topic_start>
Create a list to hold the parallax items
To display a list of parallax scrolling images,
you must first display a list.Create a new stateless widget called ParallaxRecipe.
Within ParallaxRecipe, build a widget tree with a
SingleChildScrollView and a Column, which forms
a list.
<code_start>class ParallaxRecipe extends StatelessWidget {
const ParallaxRecipe({super.key});
@override
Widget build(BuildContext context) {
return const SingleChildScrollView(
child: Column(
children: [],
),
);
}
}<code_end>
<topic_end>
<topic_start>
Display items with text and a static image
Each list item displays a rounded-rectangle background
image, representing one of seven locations in the world.
Stacked on top of that background image is the
name of the location and its country,
positioned in the lower left. Between the
background image and the text is a dark gradient,
which improves the legibility
of the text against the background.Implement a stateless widget called LocationListItem
that consists of the previously mentioned visuals.
For now, use a static Image widget for the background.
Later, you’ll replace that widget with a parallax version.
<code_start>@immutable
class LocationListItem extends StatelessWidget {
const LocationListItem({
super.key,
required this.imageUrl,
required this.name,
required this.country,
});
final String imageUrl;
final String name;
final String country;
@override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
child: AspectRatio(
aspectRatio: 16 / 9,
child: ClipRRect(
borderRadius: BorderRadius.circular(16),
child: Stack(
children: [
_buildParallaxBackground(context),
_buildGradient(),
_buildTitleAndSubtitle(),
],
),
),
),
);
}
Widget _buildParallaxBackground(BuildContext context) {
return Positioned.fill(
child: Image.network(
imageUrl,
fit: BoxFit.cover,
),
);
}
Widget _buildGradient() {
return Positioned.fill(
child: DecoratedBox(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [Colors.transparent, Colors.black.withOpacity(0.7)],
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
stops: const [0.6, 0.95],
),
),
),
);
}
Widget _buildTitleAndSubtitle() {
return Positioned(
left: 20,
bottom: 20,
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
name,