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// 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 'package:flutter/foundation.dart';
import 'package:flutter/services.dart' show Brightness;
import 'package:flutter/widgets.dart';
import 'colors.dart';
// Please update _TextThemeDefaultsBuilder accordingly after changing the default
// color here, as their implementation depends on the default value of the color
// field.
//
// Values derived from https://developer.apple.com/design/resources/.
const TextStyle _kDefaultTextStyle = TextStyle(
inherit: false,
fontFamily: '.SF Pro Text',
fontSize: 17.0,
letterSpacing: -0.41,
color: CupertinoColors.label,
decoration: TextDecoration.none,
);
// Please update _TextThemeDefaultsBuilder accordingly after changing the default
// color here, as their implementation depends on the default value of the color
// field.
//
// Values derived from https://developer.apple.com/design/resources/.
const TextStyle _kDefaultActionTextStyle = TextStyle(
inherit: false,
fontFamily: '.SF Pro Text',
fontSize: 17.0,
letterSpacing: -0.41,
color: CupertinoColors.activeBlue,
decoration: TextDecoration.none,
);
// Please update _TextThemeDefaultsBuilder accordingly after changing the default
// color here, as their implementation depends on the default value of the color
// field.
//
// Values derived from https://developer.apple.com/design/resources/.
const TextStyle _kDefaultTabLabelTextStyle = TextStyle(
inherit: false,
fontFamily: '.SF Pro Text',
fontSize: 10.0,
letterSpacing: -0.24,
color: CupertinoColors.inactiveGray,
);
const TextStyle _kDefaultMiddleTitleTextStyle = TextStyle(
inherit: false,
fontFamily: '.SF Pro Text',
fontSize: 17.0,
fontWeight: FontWeight.w600,
letterSpacing: -0.41,
color: CupertinoColors.label,
);
const TextStyle _kDefaultLargeTitleTextStyle = TextStyle(
inherit: false,
fontFamily: '.SF Pro Display',
fontSize: 34.0,
fontWeight: FontWeight.w700,
letterSpacing: 0.41,
color: CupertinoColors.label,
);
// Please update _TextThemeDefaultsBuilder accordingly after changing the default
// color here, as their implementation depends on the default value of the color
// field.
//
// Inspected on iOS 13 simulator with "Debug View Hierarchy".
// Value extracted from off-center labels. Centered labels have a font size of 25pt.
//
// The letterSpacing sourced from iOS 14 simulator screenshots for comparison.
// See also:
//
// * https://github.com/flutter/flutter/pull/65501#discussion_r486557093
const TextStyle _kDefaultPickerTextStyle = TextStyle(
inherit: false,
fontFamily: '.SF Pro Display',
fontSize: 21.0,
fontWeight: FontWeight.w400,
letterSpacing: -0.6,
color: CupertinoColors.label,
);
// Please update _TextThemeDefaultsBuilder accordingly after changing the default
// color here, as their implementation depends on the default value of the color
// field.
//
// Inspected on iOS 13 simulator with "Debug View Hierarchy".
// Value extracted from off-center labels. Centered labels have a font size of 25pt.
const TextStyle _kDefaultDateTimePickerTextStyle = TextStyle(
inherit: false,
fontFamily: '.SF Pro Display',
fontSize: 21,
fontWeight: FontWeight.normal,
color: CupertinoColors.label,
);
TextStyle? _resolveTextStyle(TextStyle? style, BuildContext context) {
// This does not resolve the shadow color, foreground, background, etc.
return style?.copyWith(
color: CupertinoDynamicColor.maybeResolve(style.color, context),
backgroundColor: CupertinoDynamicColor.maybeResolve(style.backgroundColor, context),
decorationColor: CupertinoDynamicColor.maybeResolve(style.decorationColor, context),
);
}
/// Cupertino typography theme in a [CupertinoThemeData].
@immutable
class CupertinoTextThemeData with Diagnosticable {
/// Create a [CupertinoTextThemeData].
///
/// The [primaryColor] is used to derive TextStyle defaults of other attributes
/// such as [navActionTextStyle] and [actionTextStyle], it must not be null when
/// either [navActionTextStyle] or [actionTextStyle] is null. Defaults to
/// [CupertinoColors.systemBlue].
///
/// Other [TextStyle] parameters default to default iOS text styles when
/// unspecified.
const CupertinoTextThemeData({
Color primaryColor = CupertinoColors.systemBlue,
TextStyle? textStyle,
TextStyle? actionTextStyle,
TextStyle? tabLabelTextStyle,
TextStyle? navTitleTextStyle,
TextStyle? navLargeTitleTextStyle,
TextStyle? navActionTextStyle,
TextStyle? pickerTextStyle,
TextStyle? dateTimePickerTextStyle,
}) : this._raw(
const _TextThemeDefaultsBuilder(CupertinoColors.label, CupertinoColors.inactiveGray),
primaryColor,
textStyle,
actionTextStyle,
tabLabelTextStyle,
navTitleTextStyle,
navLargeTitleTextStyle,
navActionTextStyle,
pickerTextStyle,
dateTimePickerTextStyle,
);
const CupertinoTextThemeData._raw(
this._defaults,
this._primaryColor,
this._textStyle,
this._actionTextStyle,
this._tabLabelTextStyle,
this._navTitleTextStyle,
this._navLargeTitleTextStyle,
this._navActionTextStyle,
this._pickerTextStyle,
this._dateTimePickerTextStyle,
) : assert((_navActionTextStyle != null && _actionTextStyle != null) || _primaryColor != null);
final _TextThemeDefaultsBuilder _defaults;
final Color? _primaryColor;
final TextStyle? _textStyle;
/// The [TextStyle] of general text content for Cupertino widgets.
TextStyle get textStyle => _textStyle ?? _defaults.textStyle;
final TextStyle? _actionTextStyle;
/// The [TextStyle] of interactive text content such as text in a button without background.
TextStyle get actionTextStyle {
return _actionTextStyle ?? _defaults.actionTextStyle(primaryColor: _primaryColor);
}
final TextStyle? _tabLabelTextStyle;
/// The [TextStyle] of unselected tabs.
TextStyle get tabLabelTextStyle => _tabLabelTextStyle ?? _defaults.tabLabelTextStyle;
final TextStyle? _navTitleTextStyle;
/// The [TextStyle] of titles in standard navigation bars.
TextStyle get navTitleTextStyle => _navTitleTextStyle ?? _defaults.navTitleTextStyle;
final TextStyle? _navLargeTitleTextStyle;
/// The [TextStyle] of large titles in sliver navigation bars.
TextStyle get navLargeTitleTextStyle => _navLargeTitleTextStyle ?? _defaults.navLargeTitleTextStyle;
final TextStyle? _navActionTextStyle;
/// The [TextStyle] of interactive text content in navigation bars.
TextStyle get navActionTextStyle {
return _navActionTextStyle ?? _defaults.navActionTextStyle(primaryColor: _primaryColor);
}
final TextStyle? _pickerTextStyle;
/// The [TextStyle] of pickers.
TextStyle get pickerTextStyle => _pickerTextStyle ?? _defaults.pickerTextStyle;
final TextStyle? _dateTimePickerTextStyle;
/// The [TextStyle] of date time pickers.
TextStyle get dateTimePickerTextStyle => _dateTimePickerTextStyle ?? _defaults.dateTimePickerTextStyle;
/// Returns a copy of the current [CupertinoTextThemeData] with all the colors
/// resolved against the given [BuildContext].
///
/// If any of the [InheritedWidget]s required to resolve this
/// [CupertinoTextThemeData] is not found in [context], any unresolved
/// [CupertinoDynamicColor]s will use the default trait value
/// ([Brightness.light] platform brightness, normal contrast,
/// [CupertinoUserInterfaceLevelData.base] elevation level).
CupertinoTextThemeData resolveFrom(BuildContext context) {
return CupertinoTextThemeData._raw(
_defaults.resolveFrom(context),
CupertinoDynamicColor.maybeResolve(_primaryColor, context),
_resolveTextStyle(_textStyle, context),
_resolveTextStyle(_actionTextStyle, context),
_resolveTextStyle(_tabLabelTextStyle, context),
_resolveTextStyle(_navTitleTextStyle, context),
_resolveTextStyle(_navLargeTitleTextStyle, context),
_resolveTextStyle(_navActionTextStyle, context),
_resolveTextStyle(_pickerTextStyle, context),
_resolveTextStyle(_dateTimePickerTextStyle, context),
);
}
/// Returns a copy of the current [CupertinoTextThemeData] instance with
/// specified overrides.
CupertinoTextThemeData copyWith({
Color? primaryColor,
TextStyle? textStyle,
TextStyle? actionTextStyle,
TextStyle? tabLabelTextStyle,
TextStyle? navTitleTextStyle,
TextStyle? navLargeTitleTextStyle,
TextStyle? navActionTextStyle,
TextStyle? pickerTextStyle,
TextStyle? dateTimePickerTextStyle,
}) {
return CupertinoTextThemeData._raw(
_defaults,
primaryColor ?? _primaryColor,
textStyle ?? _textStyle,
actionTextStyle ?? _actionTextStyle,
tabLabelTextStyle ?? _tabLabelTextStyle,
navTitleTextStyle ?? _navTitleTextStyle,
navLargeTitleTextStyle ?? _navLargeTitleTextStyle,
navActionTextStyle ?? _navActionTextStyle,
pickerTextStyle ?? _pickerTextStyle,
dateTimePickerTextStyle ?? _dateTimePickerTextStyle,
);
}
@override
void debugFillProperties(DiagnosticPropertiesBuilder properties) {
super.debugFillProperties(properties);
const CupertinoTextThemeData defaultData = CupertinoTextThemeData();
properties.add(DiagnosticsProperty<TextStyle>('textStyle', textStyle, defaultValue: defaultData.textStyle));
properties.add(DiagnosticsProperty<TextStyle>('actionTextStyle', actionTextStyle, defaultValue: defaultData.actionTextStyle));
properties.add(DiagnosticsProperty<TextStyle>('tabLabelTextStyle', tabLabelTextStyle, defaultValue: defaultData.tabLabelTextStyle));
properties.add(DiagnosticsProperty<TextStyle>('navTitleTextStyle', navTitleTextStyle, defaultValue: defaultData.navTitleTextStyle));
properties.add(DiagnosticsProperty<TextStyle>('navLargeTitleTextStyle', navLargeTitleTextStyle, defaultValue: defaultData.navLargeTitleTextStyle));
properties.add(DiagnosticsProperty<TextStyle>('navActionTextStyle', navActionTextStyle, defaultValue: defaultData.navActionTextStyle));
properties.add(DiagnosticsProperty<TextStyle>('pickerTextStyle', pickerTextStyle, defaultValue: defaultData.pickerTextStyle));
properties.add(DiagnosticsProperty<TextStyle>('dateTimePickerTextStyle', dateTimePickerTextStyle, defaultValue: defaultData.dateTimePickerTextStyle));
}
}
@immutable
class _TextThemeDefaultsBuilder {
const _TextThemeDefaultsBuilder(
this.labelColor,
this.inactiveGrayColor,
) : assert(labelColor != null),
assert(inactiveGrayColor != null);
final Color labelColor;
final Color inactiveGrayColor;
static TextStyle _applyLabelColor(TextStyle original, Color color) {
return original.color == color
? original
: original.copyWith(color: color);
}
TextStyle get textStyle => _applyLabelColor(_kDefaultTextStyle, labelColor);
TextStyle get tabLabelTextStyle => _applyLabelColor(_kDefaultTabLabelTextStyle, inactiveGrayColor);
TextStyle get navTitleTextStyle => _applyLabelColor(_kDefaultMiddleTitleTextStyle, labelColor);
TextStyle get navLargeTitleTextStyle => _applyLabelColor(_kDefaultLargeTitleTextStyle, labelColor);
TextStyle get pickerTextStyle => _applyLabelColor(_kDefaultPickerTextStyle, labelColor);
TextStyle get dateTimePickerTextStyle => _applyLabelColor(_kDefaultDateTimePickerTextStyle, labelColor);
TextStyle actionTextStyle({ Color? primaryColor }) => _kDefaultActionTextStyle.copyWith(color: primaryColor);
TextStyle navActionTextStyle({ Color? primaryColor }) => actionTextStyle(primaryColor: primaryColor);
_TextThemeDefaultsBuilder resolveFrom(BuildContext context) {
final Color resolvedLabelColor = CupertinoDynamicColor.resolve(labelColor, context);
final Color resolvedInactiveGray = CupertinoDynamicColor.resolve(inactiveGrayColor, context);
return resolvedLabelColor == labelColor && resolvedInactiveGray == CupertinoColors.inactiveGray
? this
: _TextThemeDefaultsBuilder(resolvedLabelColor, resolvedInactiveGray);
}
}