flutter/dev/tools/gen_defaults/lib/action_chip_template.dart
Qun Cheng a2c7ed95d1
Introduce tone-based surfaces and accent color add-ons - Part 2 (#138521)
This PR is to introduce 19 new color roles and deprecate 3 color roles in `ColorScheme`.
**Tone-based surface colors** (7 colors): 
* surfaceBright
* surfaceDim
* surfaceContainer
* surfaceContainerLowest
* surfaceContainerLow
* surfaceContainerHigh
* surfaceContainerHighest

**Accent color add-ons** (12 colors):
* primary/secondary/tertiary-Fixed
* primary/secondary/tertiary-FixedDim
* onPrimary/onSecondary/onTertiary-Fixed
* onPrimary/onSecondary/onTertiary-FixedVariant

**Deprecated colors**:
* background -> replaced with surface
* onBackground -> replaced with onSurface
* surfaceVariant -> replaced with surfaceContainerHighest

Please checkout this [design doc](https://docs.google.com/document/d/1ODqivpM_6c490T4j5XIiWCDKo5YqHy78YEFqDm4S8h4/edit?usp=sharing) for more information:)

![Screenshot 2024-01-08 at 4 56 51 PM](https://github.com/flutter/flutter/assets/36861262/353cdb4c-6ba9-4435-a518-fd3f67e415f0)
2024-02-20 19:01:50 +00:00

113 lines
4.1 KiB
Dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'template.dart';
class ActionChipTemplate extends TokenTemplate {
const ActionChipTemplate(super.blockName, super.fileName, super.tokens, {
super.colorSchemePrefix = '_colors.',
super.textThemePrefix = '_textTheme.'
});
static const String tokenGroup = 'md.comp.assist-chip';
static const String flatVariant = '.flat';
static const String elevatedVariant = '.elevated';
@override
String generate() => '''
class _${blockName}DefaultsM3 extends ChipThemeData {
_${blockName}DefaultsM3(this.context, this.isEnabled, this._chipVariant)
: super(
shape: ${shape("$tokenGroup.container")},
showCheckmark: true,
);
final BuildContext context;
final bool isEnabled;
final _ChipVariant _chipVariant;
late final ColorScheme _colors = Theme.of(context).colorScheme;
late final TextTheme _textTheme = Theme.of(context).textTheme;
@override
double? get elevation => _chipVariant == _ChipVariant.flat
? ${elevation("$tokenGroup$flatVariant.container")}
: isEnabled ? ${elevation("$tokenGroup$elevatedVariant.container")} : ${elevation("$tokenGroup$elevatedVariant.disabled.container")};
@override
double? get pressElevation => ${elevation("$tokenGroup$elevatedVariant.pressed.container")};
@override
TextStyle? get labelStyle => ${textStyle("$tokenGroup.label-text")}?.copyWith(
color: isEnabled
? ${color("$tokenGroup.label-text.color")}
: ${color("$tokenGroup.disabled.label-text.color")},
);
@override
MaterialStateProperty<Color?>? get color =>
MaterialStateProperty.resolveWith((Set<MaterialState> states) {
if (states.contains(MaterialState.disabled)) {
return _chipVariant == _ChipVariant.flat
? ${componentColor("$tokenGroup$flatVariant.disabled.container")}
: ${componentColor("$tokenGroup$elevatedVariant.disabled.container")};
}
return _chipVariant == _ChipVariant.flat
? ${componentColor("$tokenGroup$flatVariant.container")}
: ${componentColor("$tokenGroup$elevatedVariant.container")};
});
@override
Color? get shadowColor => _chipVariant == _ChipVariant.flat
? ${colorOrTransparent("$tokenGroup$flatVariant.container.shadow-color")}
: ${colorOrTransparent("$tokenGroup$elevatedVariant.container.shadow-color")};
@override
Color? get surfaceTintColor => ${colorOrTransparent("$tokenGroup.container.surface-tint-layer.color")};
@override
Color? get checkmarkColor => null;
@override
Color? get deleteIconColor => null;
@override
BorderSide? get side => _chipVariant == _ChipVariant.flat
? isEnabled
? ${border('$tokenGroup$flatVariant.outline')}
: ${border('$tokenGroup$flatVariant.disabled.outline')}
: const BorderSide(color: Colors.transparent);
@override
IconThemeData? get iconTheme => IconThemeData(
color: isEnabled
? ${color("$tokenGroup.with-icon.icon.color")}
: ${color("$tokenGroup.with-icon.disabled.icon.color")},
size: ${getToken("$tokenGroup.with-icon.icon.size")},
);
@override
EdgeInsetsGeometry? get padding => const EdgeInsets.all(8.0);
/// The label padding of the chip scales with the font size specified in the
/// [labelStyle], and the system font size settings that scale font sizes
/// globally.
///
/// The chip at effective font size 14.0 starts with 8px on each side and as
/// the font size scales up to closer to 28.0, the label padding is linearly
/// interpolated from 8px to 4px. Once the label has a font size of 2 or
/// higher, label padding remains 4px.
@override
EdgeInsetsGeometry? get labelPadding {
final double fontSize = labelStyle?.fontSize ?? 14.0;
final double fontSizeRatio = MediaQuery.textScalerOf(context).scale(fontSize) / 14.0;
return EdgeInsets.lerp(
const EdgeInsets.symmetric(horizontal: 8.0),
const EdgeInsets.symmetric(horizontal: 4.0),
clampDouble(fontSizeRatio - 1.0, 0.0, 1.0),
)!;
}
}
''';
}