text stringlengths 1 372 |
|---|
final string country; |
final GlobalKey _backgroundImageKey = GlobalKey(); |
@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 flow( |
delegate: ParallaxFlowDelegate( |
scrollable: scrollable.of(context), |
listItemContext: context, |
backgroundImageKey: _backgroundImageKey, |
), |
children: [ |
image.network( |
imageUrl, |
key: _backgroundImageKey, |
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, |
style: const TextStyle( |
color: colors.white, |
fontSize: 20, |
fontWeight: FontWeight.bold, |
), |
), |
text( |
country, |
style: const TextStyle( |
color: colors.white, |
fontSize: 14, |
), |
), |
], |
), |
); |
} |
} |
class ParallaxFlowDelegate extends FlowDelegate { |
ParallaxFlowDelegate({ |
required this.scrollable, |
required this.listItemContext, |
required this.backgroundImageKey, |
}) : super(repaint: scrollable.position); |
final ScrollableState scrollable; |
final BuildContext listItemContext; |
final GlobalKey backgroundImageKey; |
@override |
BoxConstraints getConstraintsForChild(int i, BoxConstraints constraints) { |
return BoxConstraints.tightFor( |
width: constraints.maxWidth, |
); |
} |
@override |
void paintChildren(FlowPaintingContext context) { |
// calculate the position of this list item within the viewport. |
final scrollableBox = scrollable.context.findRenderObject() as RenderBox; |
final listItemBox = listItemContext.findRenderObject() as RenderBox; |
final listItemOffset = listItemBox.localToGlobal( |
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