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Demo app for Flutter issue #108539: Cannot theme Shape differently for SnackBar with different behavior
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| // MIT License | |
| // | |
| // Copyright (c) 2022 Mike Rydstrom | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a copy | |
| // of this software and associated documentation files (the "Software"), to deal | |
| // in the Software without restriction, including without limitation the rights | |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| // copies of the Software, and to permit persons to whom the Software is | |
| // furnished to do so, subject to the following conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be included in all | |
| // copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| // SOFTWARE. | |
| import 'package:flutter/material.dart'; | |
| // Light M3 ColorScheme. | |
| const ColorScheme mySchemeLight = ColorScheme( | |
| brightness: Brightness.light, | |
| primary: Color(0xff386a20), | |
| onPrimary: Color(0xffffffff), | |
| primaryContainer: Color(0xffc0f0a4), | |
| onPrimaryContainer: Color(0xff042100), | |
| secondary: Color(0xff55624c), | |
| onSecondary: Color(0xffffffff), | |
| secondaryContainer: Color(0xffd9e7cb), | |
| onSecondaryContainer: Color(0xff131f0d), | |
| tertiary: Color(0xff386667), | |
| onTertiary: Color(0xffffffff), | |
| tertiaryContainer: Color(0xffbbebeb), | |
| onTertiaryContainer: Color(0xff002021), | |
| error: Color(0xffba1b1b), | |
| onError: Color(0xffffffff), | |
| errorContainer: Color(0xffffdad4), | |
| onErrorContainer: Color(0xff410001), | |
| outline: Color(0xff74796e), | |
| background: Color(0xfffdfdf6), | |
| onBackground: Color(0xff1a1c18), | |
| surface: Color(0xfffdfdf6), | |
| onSurface: Color(0xff1a1c18), | |
| surfaceVariant: Color(0xffdfe4d6), | |
| onSurfaceVariant: Color(0xff43493e), | |
| inverseSurface: Color(0xff2f312c), | |
| onInverseSurface: Color(0xfff1f1ea), | |
| inversePrimary: Color(0xff9cd67d), | |
| shadow: Color(0xff000000), | |
| surfaceTint: Color(0xff386a20), | |
| ); | |
| // Dark M3 ColorScheme. | |
| const ColorScheme mySchemeDark = ColorScheme( | |
| brightness: Brightness.dark, | |
| primary: Color(0xff9cd67d), | |
| onPrimary: Color(0xff0c3900), | |
| primaryContainer: Color(0xff205107), | |
| onPrimaryContainer: Color(0xffc0f0a4), | |
| secondary: Color(0xffbdcbb0), | |
| onSecondary: Color(0xff273420), | |
| secondaryContainer: Color(0xff3e4a36), | |
| onSecondaryContainer: Color(0xffd9e7cb), | |
| tertiary: Color(0xffa0cfcf), | |
| onTertiary: Color(0xff003738), | |
| tertiaryContainer: Color(0xff1e4e4e), | |
| onTertiaryContainer: Color(0xffbbebeb), | |
| error: Color(0xffffb4a9), | |
| onError: Color(0xff680003), | |
| errorContainer: Color(0xff930006), | |
| onErrorContainer: Color(0xffffb4a9), | |
| outline: Color(0xff8d9286), | |
| background: Color(0xff1a1c18), | |
| onBackground: Color(0xffe3e3dc), | |
| surface: Color(0xff1a1c18), | |
| onSurface: Color(0xffe3e3dc), | |
| surfaceVariant: Color(0xff43493e), | |
| onSurfaceVariant: Color(0xffc4c8bb), | |
| inverseSurface: Color(0xffe3e3dc), | |
| onInverseSurface: Color(0xff2f312c), | |
| inversePrimary: Color(0xff386a20), | |
| shadow: Color(0xff000000), | |
| surfaceTint: Color(0xff9cd67d), | |
| ); | |
| const mySnackTheme = SnackBarThemeData( | |
| shape: RoundedRectangleBorder( | |
| borderRadius: BorderRadius.only( | |
| topLeft: Radius.circular(16.0), | |
| topRight: Radius.circular(16.0), | |
| bottomLeft: Radius.circular(16.0), | |
| bottomRight: Radius.circular(16.0), | |
| ), | |
| ), | |
| ); | |
| // Example theme - | |
| ThemeData demoTheme(Brightness mode, bool useMaterial3, bool useSnackTheme) => | |
| mode == Brightness.light | |
| ? ThemeData( | |
| colorScheme: mySchemeLight, | |
| toggleableActiveColor: | |
| useMaterial3 ? mySchemeLight.primary : mySchemeLight.secondary, | |
| primaryColor: mySchemeLight.primary, | |
| primaryColorLight: Color.alphaBlend( | |
| Colors.white.withAlpha(0x66), mySchemeLight.primary), | |
| primaryColorDark: Color.alphaBlend( | |
| Colors.black.withAlpha(0x66), mySchemeLight.primary), | |
| secondaryHeaderColor: Color.alphaBlend( | |
| Colors.white.withAlpha(0xCC), mySchemeLight.primary), | |
| scaffoldBackgroundColor: mySchemeLight.background, | |
| canvasColor: mySchemeLight.background, | |
| backgroundColor: mySchemeLight.background, | |
| cardColor: mySchemeLight.surface, | |
| bottomAppBarColor: mySchemeLight.surface, | |
| dialogBackgroundColor: mySchemeLight.surface, | |
| indicatorColor: mySchemeLight.onPrimary, | |
| dividerColor: mySchemeLight.onSurface.withOpacity(0.12), | |
| errorColor: mySchemeLight.error, | |
| applyElevationOverlayColor: false, | |
| useMaterial3: useMaterial3, | |
| visualDensity: VisualDensity.standard, | |
| // Assign the SnackBar demo theme | |
| snackBarTheme: useSnackTheme ? mySnackTheme : null, | |
| ) | |
| : ThemeData( | |
| colorScheme: mySchemeDark, | |
| toggleableActiveColor: | |
| useMaterial3 ? mySchemeDark.primary : mySchemeDark.secondary, | |
| primaryColor: mySchemeDark.primary, | |
| primaryColorLight: Color.alphaBlend( | |
| Colors.white.withAlpha(0x59), mySchemeDark.primary), | |
| primaryColorDark: Color.alphaBlend( | |
| Colors.black.withAlpha(0x72), mySchemeDark.primary), | |
| secondaryHeaderColor: Color.alphaBlend( | |
| Colors.black.withAlpha(0x99), mySchemeDark.primary), | |
| scaffoldBackgroundColor: mySchemeDark.background, | |
| canvasColor: mySchemeDark.background, | |
| backgroundColor: mySchemeDark.background, | |
| cardColor: mySchemeDark.surface, | |
| bottomAppBarColor: mySchemeDark.surface, | |
| dialogBackgroundColor: mySchemeDark.surface, | |
| indicatorColor: mySchemeDark.onBackground, | |
| dividerColor: mySchemeDark.onSurface.withOpacity(0.12), | |
| errorColor: mySchemeDark.error, | |
| applyElevationOverlayColor: true, | |
| useMaterial3: useMaterial3, | |
| visualDensity: VisualDensity.standard, | |
| // Assign the SnackBar demo theme | |
| snackBarTheme: useSnackTheme ? mySnackTheme : null, | |
| ); | |
| void main() { | |
| runApp(const IssueDemoApp()); | |
| } | |
| class IssueDemoApp extends StatefulWidget { | |
| const IssueDemoApp({super.key}); | |
| @override | |
| State<IssueDemoApp> createState() => _IssueDemoAppState(); | |
| } | |
| class _IssueDemoAppState extends State<IssueDemoApp> { | |
| bool useMaterial3 = false; | |
| bool useSnackTheme = true; | |
| ThemeMode themeMode = ThemeMode.light; | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| themeMode: themeMode, | |
| theme: demoTheme(Brightness.light, useMaterial3, useSnackTheme), | |
| darkTheme: demoTheme(Brightness.dark, useMaterial3, useSnackTheme), | |
| home: Scaffold( | |
| appBar: AppBar( | |
| title: const Text(('SnackBar Theme Issue')), | |
| actions: [ | |
| IconButton( | |
| icon: useSnackTheme | |
| ? const Icon(Icons.circle) | |
| : const Icon(Icons.circle_outlined), | |
| onPressed: () { | |
| setState(() { | |
| useSnackTheme = !useSnackTheme; | |
| }); | |
| }, | |
| tooltip: "Toggle SnackBar theme ${useSnackTheme ? 'OFF' : 'ON'}", | |
| ), | |
| IconButton( | |
| icon: useMaterial3 | |
| ? const Icon(Icons.filter_3) | |
| : const Icon(Icons.filter_2), | |
| onPressed: () { | |
| setState(() { | |
| useMaterial3 = !useMaterial3; | |
| }); | |
| }, | |
| tooltip: "Switch to Material ${useMaterial3 ? 2 : 3}", | |
| ), | |
| IconButton( | |
| icon: themeMode == ThemeMode.dark | |
| ? const Icon(Icons.wb_sunny_outlined) | |
| : const Icon(Icons.wb_sunny), | |
| onPressed: () { | |
| setState(() { | |
| if (themeMode == ThemeMode.light) { | |
| themeMode = ThemeMode.dark; | |
| } else { | |
| themeMode = ThemeMode.light; | |
| } | |
| }); | |
| }, | |
| tooltip: "Toggle brightness", | |
| ), | |
| ], | |
| ), | |
| body: HomePage(useSnackTheme: useSnackTheme), | |
| drawer: const Drawer(), | |
| ), | |
| ); | |
| } | |
| } | |
| class HomePage extends StatelessWidget { | |
| const HomePage({super.key, required this.useSnackTheme}); | |
| final bool useSnackTheme; | |
| @override | |
| Widget build(BuildContext context) { | |
| final String materialType = | |
| Theme.of(context).useMaterial3 ? 'Material 3' : 'Material 2'; | |
| final String shapeInfo = | |
| useSnackTheme ? '(Shape themed)' : '(No Shape theme)'; | |
| return ListView( | |
| padding: const EdgeInsets.symmetric(horizontal: 16), | |
| children: [ | |
| const SizedBox(height: 8), | |
| Text( | |
| 'Theme is $materialType', | |
| style: Theme.of(context).textTheme.titleLarge, | |
| ), | |
| const Divider(), | |
| const ShowColorSchemeColors(), | |
| const Divider(), | |
| const ShowThemeDataColors(), | |
| const Divider(), | |
| if (useSnackTheme) | |
| const Text( | |
| 'Cannot theme Shape differently for SnackBars with different behavior'), | |
| if (!useSnackTheme) | |
| const Text( | |
| 'Using no shape in theme has different Shape for SnackBar with different behavior'), | |
| const SizedBox(height: 8), | |
| OutlinedButton( | |
| onPressed: () { | |
| final snackBar = SnackBar( | |
| behavior: SnackBarBehavior.fixed, | |
| content: const Text('Yay! A FIXED SnackBar!'), | |
| action: SnackBarAction( | |
| label: 'Foo', | |
| onPressed: () {}, | |
| ), | |
| ); | |
| ScaffoldMessenger.of(context).showSnackBar(snackBar); | |
| }, | |
| child: Text('Show fixed behavior SnackBar $shapeInfo'), | |
| ), | |
| const SizedBox(height: 8), | |
| OutlinedButton( | |
| onPressed: () { | |
| final snackBar = SnackBar( | |
| behavior: SnackBarBehavior.floating, | |
| content: const Text('Yay! A FLOATING SnackBar!'), | |
| action: SnackBarAction( | |
| label: 'Bar', | |
| onPressed: () {}, | |
| ), | |
| ); | |
| ScaffoldMessenger.of(context).showSnackBar(snackBar); | |
| }, | |
| child: Text('Show floating behavior SnackBar $shapeInfo'), | |
| ), | |
| const Divider(), | |
| ], | |
| ); | |
| } | |
| } | |
| /// Draw a number of boxes showing the colors of key theme color properties | |
| /// in the ColorScheme of the inherited ThemeData and its color properties. | |
| class ShowColorSchemeColors extends StatelessWidget { | |
| const ShowColorSchemeColors({super.key, this.onBackgroundColor}); | |
| /// The color of the background the color widget are being drawn on. | |
| /// | |
| /// Some of the theme colors may have semi transparent fill color. To compute | |
| /// a legible text color for the sum when it shown on a background color, we | |
| /// need to alpha merge it with background and we need the exact background | |
| /// color it is drawn on for that. If not passed in from parent, it is | |
| /// assumed to be drawn on card color, which usually is close enough. | |
| final Color? onBackgroundColor; | |
| // Return true if the color is light, meaning it needs dark text for contrast. | |
| static bool _isLight(final Color color) => | |
| ThemeData.estimateBrightnessForColor(color) == Brightness.light; | |
| // Return true if the color is dark, meaning it needs light text for contrast. | |
| static bool _isDark(final Color color) => | |
| ThemeData.estimateBrightnessForColor(color) == Brightness.dark; | |
| // On color used when a theme color property does not have a theme onColor. | |
| static Color _onColor(final Color color, final Color bg) => | |
| _isLight(Color.alphaBlend(color, bg)) ? Colors.black : Colors.white; | |
| @override | |
| Widget build(BuildContext context) { | |
| final ThemeData theme = Theme.of(context); | |
| final ColorScheme colorScheme = theme.colorScheme; | |
| final bool isDark = colorScheme.brightness == Brightness.dark; | |
| final bool useMaterial3 = theme.useMaterial3; | |
| // Grab the card border from the theme card shape | |
| ShapeBorder? border = theme.cardTheme.shape; | |
| // If we had one, copy in a border side to it. | |
| if (border is RoundedRectangleBorder) { | |
| border = border.copyWith( | |
| side: BorderSide( | |
| color: theme.dividerColor, | |
| width: 1, | |
| ), | |
| ); | |
| // If | |
| } else { | |
| // If border was null, make one matching Card default, but with border | |
| // side, if it was not null, we leave it as it was. | |
| border ??= RoundedRectangleBorder( | |
| borderRadius: BorderRadius.all(Radius.circular(useMaterial3 ? 12 : 4)), | |
| side: BorderSide( | |
| color: theme.dividerColor, | |
| width: 1, | |
| ), | |
| ); | |
| } | |
| // Get effective background color. | |
| final Color background = | |
| onBackgroundColor ?? theme.cardTheme.color ?? theme.cardColor; | |
| // Warning label for scaffold background when it uses to much blend. | |
| final String surfaceTooHigh = isDark | |
| ? _isLight(theme.colorScheme.surface) | |
| ? '\nTOO HIGH' | |
| : '' | |
| : _isDark(theme.colorScheme.surface) | |
| ? '\nTOO HIGH' | |
| : ''; | |
| // Warning label for scaffold background when it uses to much blend. | |
| final String backTooHigh = isDark | |
| ? _isLight(theme.colorScheme.background) | |
| ? '\nTOO HIGH' | |
| : '' | |
| : _isDark(theme.colorScheme.background) | |
| ? '\nTOO HIGH' | |
| : ''; | |
| // Wrap this widget branch in a custom theme where card has a border outline | |
| // if it did not have one, but retains in ambient themed border radius. | |
| return Theme( | |
| data: Theme.of(context).copyWith( | |
| cardTheme: CardTheme.of(context).copyWith( | |
| elevation: 0, | |
| shape: border, | |
| ), | |
| ), | |
| child: Column( | |
| crossAxisAlignment: CrossAxisAlignment.start, | |
| children: <Widget>[ | |
| Padding( | |
| padding: const EdgeInsets.symmetric(vertical: 8), | |
| child: Text( | |
| 'ColorScheme Colors', | |
| style: theme.textTheme.titleMedium, | |
| ), | |
| ), | |
| Wrap( | |
| alignment: WrapAlignment.start, | |
| crossAxisAlignment: WrapCrossAlignment.center, | |
| spacing: 6, | |
| runSpacing: 6, | |
| children: <Widget>[ | |
| ColorCard( | |
| label: 'Primary', | |
| color: colorScheme.primary, | |
| textColor: colorScheme.onPrimary, | |
| ), | |
| ColorCard( | |
| label: 'on\nPrimary', | |
| color: colorScheme.onPrimary, | |
| textColor: colorScheme.primary, | |
| ), | |
| ColorCard( | |
| label: 'Primary\nContainer', | |
| color: colorScheme.primaryContainer, | |
| textColor: colorScheme.onPrimaryContainer, | |
| ), | |
| ColorCard( | |
| label: 'onPrimary\nContainer', | |
| color: colorScheme.onPrimaryContainer, | |
| textColor: colorScheme.primaryContainer, | |
| ), | |
| ColorCard( | |
| label: 'Secondary', | |
| color: colorScheme.secondary, | |
| textColor: colorScheme.onSecondary, | |
| ), | |
| ColorCard( | |
| label: 'on\nSecondary', | |
| color: colorScheme.onSecondary, | |
| textColor: colorScheme.secondary, | |
| ), | |
| ColorCard( | |
| label: 'Secondary\nContainer', | |
| color: colorScheme.secondaryContainer, | |
| textColor: colorScheme.onSecondaryContainer, | |
| ), | |
| ColorCard( | |
| label: 'on\nSecondary\nContainer', | |
| color: colorScheme.onSecondaryContainer, | |
| textColor: colorScheme.secondaryContainer, | |
| ), | |
| ColorCard( | |
| label: 'Tertiary', | |
| color: colorScheme.tertiary, | |
| textColor: colorScheme.onTertiary, | |
| ), | |
| ColorCard( | |
| label: 'on\nTertiary', | |
| color: colorScheme.onTertiary, | |
| textColor: colorScheme.tertiary, | |
| ), | |
| ColorCard( | |
| label: 'Tertiary\nContainer', | |
| color: colorScheme.tertiaryContainer, | |
| textColor: colorScheme.onTertiaryContainer, | |
| ), | |
| ColorCard( | |
| label: 'on\nTertiary\nContainer', | |
| color: colorScheme.onTertiaryContainer, | |
| textColor: colorScheme.tertiaryContainer, | |
| ), | |
| ColorCard( | |
| label: 'Error', | |
| color: colorScheme.error, | |
| textColor: colorScheme.onError, | |
| ), | |
| ColorCard( | |
| label: 'on\nError', | |
| color: colorScheme.onError, | |
| textColor: colorScheme.error, | |
| ), | |
| ColorCard( | |
| label: 'Error\nContainer', | |
| color: colorScheme.errorContainer, | |
| textColor: colorScheme.onErrorContainer, | |
| ), | |
| ColorCard( | |
| label: 'onError\nContainer', | |
| color: colorScheme.onErrorContainer, | |
| textColor: colorScheme.errorContainer, | |
| ), | |
| ColorCard( | |
| label: 'Background$backTooHigh', | |
| color: colorScheme.background, | |
| textColor: colorScheme.onBackground, | |
| ), | |
| ColorCard( | |
| label: 'on\nBackground', | |
| color: colorScheme.onBackground, | |
| textColor: colorScheme.background, | |
| ), | |
| ColorCard( | |
| label: 'Surface$surfaceTooHigh', | |
| color: colorScheme.surface, | |
| textColor: colorScheme.onSurface, | |
| ), | |
| ColorCard( | |
| label: 'on\nSurface', | |
| color: colorScheme.onSurface, | |
| textColor: colorScheme.surface, | |
| ), | |
| ColorCard( | |
| label: 'Surface\nVariant', | |
| color: colorScheme.surfaceVariant, | |
| textColor: colorScheme.onSurfaceVariant, | |
| ), | |
| ColorCard( | |
| label: 'onSurface\nVariant', | |
| color: colorScheme.onSurfaceVariant, | |
| textColor: colorScheme.surfaceVariant, | |
| ), | |
| ColorCard( | |
| label: 'Outline', | |
| color: colorScheme.outline, | |
| textColor: colorScheme.background, | |
| ), | |
| ColorCard( | |
| label: 'Shadow', | |
| color: colorScheme.shadow, | |
| textColor: _onColor(colorScheme.shadow, background), | |
| ), | |
| ColorCard( | |
| label: 'Inverse\nSurface', | |
| color: colorScheme.inverseSurface, | |
| textColor: colorScheme.onInverseSurface, | |
| ), | |
| ColorCard( | |
| label: 'onInverse\nSurface', | |
| color: colorScheme.onInverseSurface, | |
| textColor: colorScheme.inverseSurface, | |
| ), | |
| ColorCard( | |
| label: 'Inverse\nPrimary', | |
| color: colorScheme.inversePrimary, | |
| textColor: colorScheme.primary, | |
| ), | |
| ColorCard( | |
| label: 'Surface\nTint', | |
| color: colorScheme.surfaceTint, | |
| textColor: colorScheme.onPrimary, | |
| ), | |
| ], | |
| ), | |
| ], | |
| ), | |
| ); | |
| } | |
| } | |
| /// Draw a number of boxes showing the colors of key theme color properties | |
| /// in the ColorScheme of the inherited ThemeData and some of its key color | |
| /// properties. | |
| class ShowThemeDataColors extends StatelessWidget { | |
| const ShowThemeDataColors({ | |
| super.key, | |
| this.onBackgroundColor, | |
| }); | |
| /// The color of the background the color widget are being drawn on. | |
| /// | |
| /// Some of the theme colors may have semi-transparent fill color. To compute | |
| /// a legible text color for the sum when it shown on a background color, we | |
| /// need to alpha merge it with background and we need the exact background | |
| /// color it is drawn on for that. If not passed in from parent, it is | |
| /// assumed to be drawn on card color, which usually is close enough. | |
| final Color? onBackgroundColor; | |
| // Return true if the color is light, meaning it needs dark text for contrast. | |
| static bool _isLight(final Color color) => | |
| ThemeData.estimateBrightnessForColor(color) == Brightness.light; | |
| // Return true if the color is dark, meaning it needs light text for contrast. | |
| static bool _isDark(final Color color) => | |
| ThemeData.estimateBrightnessForColor(color) == Brightness.dark; | |
| // On color used when a theme color property does not have a theme onColor. | |
| static Color _onColor(final Color color, final Color background) => | |
| _isLight(Color.alphaBlend(color, background)) | |
| ? Colors.black | |
| : Colors.white; | |
| @override | |
| Widget build(BuildContext context) { | |
| final ThemeData theme = Theme.of(context); | |
| final ColorScheme colorScheme = theme.colorScheme; | |
| final bool isDark = colorScheme.brightness == Brightness.dark; | |
| final bool useMaterial3 = theme.useMaterial3; | |
| // Grab the card border from the theme card shape | |
| ShapeBorder? border = theme.cardTheme.shape; | |
| // If we had one, copy in a border side to it. | |
| if (border is RoundedRectangleBorder) { | |
| border = border.copyWith( | |
| side: BorderSide( | |
| color: theme.dividerColor, | |
| width: 1, | |
| ), | |
| ); | |
| } else { | |
| // If border was null, make one matching Card default, but with border | |
| // side, if it was not null, we leave it as it was. | |
| border ??= RoundedRectangleBorder( | |
| borderRadius: BorderRadius.all(Radius.circular(useMaterial3 ? 12 : 4)), | |
| side: BorderSide( | |
| color: theme.dividerColor, | |
| width: 1, | |
| ), | |
| ); | |
| } | |
| // Get effective background color. | |
| final Color background = | |
| onBackgroundColor ?? theme.cardTheme.color ?? theme.cardColor; | |
| // Warning label for scaffold background when it uses to much blend. | |
| final String scaffoldTooHigh = isDark | |
| ? _isLight(theme.scaffoldBackgroundColor) | |
| ? '\nTOO HIGH' | |
| : '' | |
| : _isDark(theme.scaffoldBackgroundColor) | |
| ? '\nTOO HIGH' | |
| : ''; | |
| // Warning label for scaffold background when it uses to much blend. | |
| final String surfaceTooHigh = isDark | |
| ? _isLight(theme.colorScheme.surface) | |
| ? '\nTOO HIGH' | |
| : '' | |
| : _isDark(theme.colorScheme.surface) | |
| ? '\nTOO HIGH' | |
| : ''; | |
| // Warning label for scaffold background when it uses to much blend. | |
| final String backTooHigh = isDark | |
| ? _isLight(theme.colorScheme.background) | |
| ? '\nTOO HIGH' | |
| : '' | |
| : _isDark(theme.colorScheme.background) | |
| ? '\nTOO HIGH' | |
| : ''; | |
| // Wrap this widget branch in a custom theme where card has a border outline | |
| // if it did not have one, but retains in ambient themed border radius. | |
| return Theme( | |
| data: Theme.of(context).copyWith( | |
| cardTheme: CardTheme.of(context).copyWith( | |
| elevation: 0, | |
| shape: border, | |
| ), | |
| ), | |
| child: Column( | |
| crossAxisAlignment: CrossAxisAlignment.start, | |
| children: <Widget>[ | |
| Padding( | |
| padding: const EdgeInsets.only(top: 8), | |
| child: Text( | |
| 'ThemeData Colors', | |
| style: theme.textTheme.titleMedium, | |
| ), | |
| ), | |
| const SizedBox(height: 8), | |
| Wrap( | |
| spacing: 6, | |
| runSpacing: 6, | |
| crossAxisAlignment: WrapCrossAlignment.center, | |
| children: <Widget>[ | |
| ColorCard( | |
| label: 'Primary\nColor', | |
| color: theme.primaryColor, | |
| textColor: _onColor(theme.primaryColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Primary\nDark', | |
| color: theme.primaryColorDark, | |
| textColor: _onColor(theme.primaryColorDark, background), | |
| ), | |
| ColorCard( | |
| label: 'Primary\nLight', | |
| color: theme.primaryColorLight, | |
| textColor: _onColor(theme.primaryColorLight, background), | |
| ), | |
| ColorCard( | |
| label: 'Secondary\nHeader', | |
| color: theme.secondaryHeaderColor, | |
| textColor: _onColor(theme.secondaryHeaderColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Toggleable\nActive', | |
| color: theme.toggleableActiveColor, | |
| textColor: _onColor(theme.toggleableActiveColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Bottom\nAppBar', | |
| color: theme.bottomAppBarColor, | |
| textColor: _onColor(theme.bottomAppBarColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Error\nColor', | |
| color: theme.errorColor, | |
| textColor: colorScheme.onError, | |
| ), | |
| ColorCard( | |
| label: 'Canvas$backTooHigh', | |
| color: theme.canvasColor, | |
| textColor: _onColor(theme.canvasColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Card$surfaceTooHigh', | |
| color: theme.cardColor, | |
| textColor: _onColor(theme.cardColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Scaffold\nBackground$scaffoldTooHigh', | |
| color: theme.scaffoldBackgroundColor, | |
| textColor: _onColor(theme.scaffoldBackgroundColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Dialog', | |
| color: theme.dialogBackgroundColor, | |
| textColor: _onColor(theme.dialogBackgroundColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Indicator\nColor', | |
| color: theme.indicatorColor, | |
| textColor: _onColor(theme.indicatorColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Divider\nColor', | |
| color: theme.dividerColor, | |
| textColor: _onColor(theme.dividerColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Disabled\nColor', | |
| color: theme.disabledColor, | |
| textColor: _onColor(theme.disabledColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Hover\nColor', | |
| color: theme.hoverColor, | |
| textColor: _onColor(theme.hoverColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Focus\nColor', | |
| color: theme.focusColor, | |
| textColor: _onColor(theme.focusColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Highlight\nColor', | |
| color: theme.highlightColor, | |
| textColor: _onColor(theme.highlightColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Splash\nColor', | |
| color: theme.splashColor, | |
| textColor: _onColor(theme.splashColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Shadow\nColor', | |
| color: theme.shadowColor, | |
| textColor: _onColor(theme.shadowColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Hint\nColor', | |
| color: theme.hintColor, | |
| textColor: _onColor(theme.hintColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Selected\nRow', | |
| color: theme.selectedRowColor, | |
| textColor: _onColor(theme.selectedRowColor, background), | |
| ), | |
| ColorCard( | |
| label: 'Unselected\nWidget', | |
| color: theme.unselectedWidgetColor, | |
| textColor: _onColor(theme.unselectedWidgetColor, background), | |
| ), | |
| ], | |
| ), | |
| ], | |
| ), | |
| ); | |
| } | |
| } | |
| class ColorCard extends StatelessWidget { | |
| const ColorCard({ | |
| super.key, | |
| required this.label, | |
| required this.color, | |
| required this.textColor, | |
| this.size, | |
| }); | |
| final String label; | |
| final Color color; | |
| final Color textColor; | |
| final Size? size; | |
| @override | |
| Widget build(BuildContext context) { | |
| return SizedBox( | |
| width: 86, | |
| height: 58, | |
| child: Card( | |
| margin: EdgeInsets.zero, | |
| clipBehavior: Clip.antiAlias, | |
| color: color, | |
| child: Center( | |
| child: Text( | |
| label, | |
| style: TextStyle(color: textColor, fontSize: 11), | |
| textAlign: TextAlign.center, | |
| ), | |
| ), | |
| ), | |
| ); | |
| } | |
| } |
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This is demo code for Flutter issue flutter/flutter#108539