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July 19, 2024 16:03
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elevation screen
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// Copyright 2024 Fredrick Allan Grott. All rights reserved. | |
// Use of this source code is governed by a BSD-style | |
// license that can be found in the LICENSE file. | |
// | |
// Modified from the Flutter Samples Material Demo | |
// Copyright 2021 under BSD license by Flutter Team | |
import 'package:flutter/material.dart'; | |
class ElevationScreen extends StatelessWidget { | |
const ElevationScreen({super.key}); | |
@override | |
Widget build(BuildContext context) { | |
final elevationScrollController = ScrollController(); | |
final Color shadowColor = Theme.of(context).colorScheme.shadow; | |
final Color surfaceTint = Theme.of(context).colorScheme.primary; | |
return Expanded( | |
child: CustomScrollView( | |
key: const PageStorageKey("elevation"), | |
// ignore: avoid_redundant_argument_values | |
controller: elevationScrollController, | |
slivers: [ | |
SliverToBoxAdapter( | |
child: Padding( | |
padding: const EdgeInsets.fromLTRB(16.0, 20, 16.0, 0), | |
child: Text( | |
'Surface Tint Color Only', | |
style: Theme.of(context).textTheme.titleLarge, | |
), | |
), | |
), | |
ElevationGrid( | |
surfaceTintColor: surfaceTint, | |
shadowColor: Colors.transparent, | |
), | |
SliverList( | |
delegate: SliverChildListDelegate(<Widget>[ | |
const SizedBox(height: 10), | |
Padding( | |
padding: const EdgeInsets.fromLTRB(16.0, 8.0, 16.0, 0), | |
child: Text( | |
'Surface Tint Color and Shadow Color', | |
style: Theme.of(context).textTheme.titleLarge, | |
), | |
), | |
]), | |
), | |
ElevationGrid( | |
shadowColor: shadowColor, | |
surfaceTintColor: surfaceTint, | |
), | |
SliverList( | |
delegate: SliverChildListDelegate(<Widget>[ | |
const SizedBox(height: 10), | |
Padding( | |
padding: const EdgeInsets.fromLTRB(16.0, 8.0, 16.0, 0), | |
child: Text( | |
'Shadow Color Only', | |
style: Theme.of(context).textTheme.titleLarge, | |
), | |
), | |
]), | |
), | |
ElevationGrid(shadowColor: shadowColor), | |
], | |
), | |
); | |
} | |
} | |
const double narrowScreenWidthThreshold = 450; | |
class ElevationGrid extends StatelessWidget { | |
const ElevationGrid({super.key, this.shadowColor, this.surfaceTintColor}); | |
final Color? shadowColor; | |
final Color? surfaceTintColor; | |
List<ElevationCard> elevationCards( | |
Color? shadowColor, | |
Color? surfaceTintColor, | |
) { | |
return elevations | |
.map( | |
(elevationInfo) => ElevationCard( | |
info: elevationInfo, | |
shadowColor: shadowColor, | |
surfaceTint: surfaceTintColor, | |
), | |
) | |
.toList(); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return SliverPadding( | |
padding: const EdgeInsets.all(8), | |
sliver: SliverLayoutBuilder( | |
builder: (context, constraints) { | |
if (constraints.crossAxisExtent < narrowScreenWidthThreshold) { | |
return SliverGrid.count( | |
crossAxisCount: 3, | |
children: elevationCards(shadowColor, surfaceTintColor), | |
); | |
} else { | |
return SliverGrid.count( | |
crossAxisCount: 6, | |
children: elevationCards(shadowColor, surfaceTintColor), | |
); | |
} | |
}, | |
), | |
); | |
} | |
} | |
class ElevationCard extends StatefulWidget { | |
const ElevationCard({ | |
super.key, | |
required this.info, | |
this.shadowColor, | |
this.surfaceTint, | |
}); | |
final ElevationInfo info; | |
final Color? shadowColor; | |
final Color? surfaceTint; | |
@override | |
State<ElevationCard> createState() => _ElevationCardState(); | |
} | |
class _ElevationCardState extends State<ElevationCard> { | |
late double _elevation; | |
@override | |
void initState() { | |
super.initState(); | |
_elevation = widget.info.elevation; | |
} | |
@override | |
Widget build(BuildContext context) { | |
const BorderRadius borderRadius = BorderRadius.all(Radius.circular(4.0)); | |
final Color color = Theme.of(context).colorScheme.surface; | |
return Padding( | |
padding: const EdgeInsets.all(8.0), | |
child: Material( | |
borderRadius: borderRadius, | |
elevation: _elevation, | |
color: color, | |
shadowColor: widget.shadowColor, | |
surfaceTintColor: widget.surfaceTint, | |
type: MaterialType.card, | |
child: Padding( | |
padding: const EdgeInsets.all(8.0), | |
child: Column( | |
crossAxisAlignment: CrossAxisAlignment.start, | |
children: <Widget>[ | |
Text( | |
'Level ${widget.info.level}', | |
style: Theme.of(context).textTheme.labelMedium, | |
), | |
Text( | |
'${widget.info.elevation.toInt()} dp', | |
style: Theme.of(context).textTheme.labelMedium, | |
), | |
if (widget.surfaceTint != null) | |
Expanded( | |
child: Align( | |
alignment: Alignment.bottomRight, | |
child: Text( | |
'${widget.info.overlayPercent}%', | |
style: Theme.of(context).textTheme.bodySmall, | |
), | |
), | |
), | |
], | |
), | |
), | |
), | |
); | |
} | |
} | |
class ElevationInfo { | |
const ElevationInfo(this.level, this.elevation, this.overlayPercent); | |
final int level; | |
final double elevation; | |
final int overlayPercent; | |
} | |
const List<ElevationInfo> elevations = <ElevationInfo>[ | |
ElevationInfo(0, 0.0, 0), | |
ElevationInfo(1, 1.0, 5), | |
ElevationInfo(2, 3.0, 8), | |
ElevationInfo(3, 6.0, 11), | |
ElevationInfo(4, 8.0, 12), | |
ElevationInfo(5, 12.0, 14), | |
]; |
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