![]() ![]() Use the source color as background, and overlay it with white and // vary its alpha to produce a lighter shade of the source color. Using alpha blends is a simple way to make a lighter shade of an existing // color. here is a simple way, using white and black colors as overlays with an alpha blend: There are many ways to do this with different results. Also look into if you can compute some additional color shades from the colors in the ColorScheme, in case none of them is the right shade. Consider first how you can use these colors in your application and design. ![]() With Flutter 2.10 and later we have the new Material 3 based ColorScheme, that contains more theme colors than before. If you do so, all your custom widgets will adjust accordingly when you change the theme, and their change from one theme mode to another will even animate correctly. If your application supports different themes that the user can switch between interactively, including dark mode, then it is important that you use theme and theme mode aware properties in your custom widgets. At least not if you want them to change with animation as you modify the theme of your application. Don’t even default them to colors, styles and properties that are not derived from the application’s theme. Don’t hard code color and styles for your custom widgets. If you do the change interactively in your app, its default color also lerp animates, since it depends on a theme color. Obviously as you change your application’s ThemeData, the FAB and your custom widget, with its matching icon color, will now follow whatever style that is. Additionally, you can give it a different custom color, for those one-off needs. Now you have a color you can use on the icon, that matches that of a default un-themed FAB, using the color as its default value, but if there was a FAB theme defined, it gets the background color from it. of ( context ) final Color effectiveIconColor = iconColor ? theme. iconColor and let it fall through the same default color behavior that the FAB has, like this:įinal ThemeData theme = Theme. Just do what built-in widgets do, give it a nullable Color? property, e.g. In this design you decided that this particular icon should have a default color that matches the background color of a FloatingActionButton, but in some case you may want a custom one-off color. If you do this, then you are on your way to create nice reusable custom widgets that automatically also follow your application’s theme as you change it.Īs an example, say you have a fancy complex composed custom widget, that contains an icon, among other things. ![]() Basically, they do a fall-through from widget property, to component theme and maybe even ThemeData and its ColorScheme, and lastly, maybe even some default built-in behavior. Use the same principle that Flutter’s built-in widgets use for their theming and default style behavior. Are there properties in ThemeData and its component themes that could be applicable to your custom widget as defaults? Also provide direct members to configure your custom widget for those one-off needs when it needs to be different from what you set via the ThemeData properties it uses as its defaults. Consider what color, font and other styles it could use as fitting default built-in behavior. When it comes to custom Widgets you make, you should, when possible, base their default styles on properties in the theme as well. There are certainly limitations, but always check first what you can do by theming the app and the built-in components it uses, to match your style requirements as close as possible. You can customize a surprising number of details with ThemeData and all its component themes. When you do this, most of your application’s design will fall into place almost automagically. By doing so, you use Flutter and its theming capabilities to work for you, and not against you. You should do this by defining an application theme that gets you as close as possible. You should strive to make the built-in widgets in Flutter look as close as you can to the look and design you want them to have in your application. This tweet with 15 slides, offers an intro to the wondrous world of Material 3 ColorScheme. For more information about the color system, see the Material 3 guide. There are new features that can help with the color design. The color scheme used to be a lot simpler before Flutter 2.10, the introduction of Material 3 makes it more complex. The property name for the used ColorScheme in ThemeData is colorScheme. Flutter’s built-in components use these colors in predefined ways. The ColorScheme class is a data class that holds 27 Color properties. The Flutter ThemeData object defines the look of your application, and to a degree how it behaves. Flutter Theming Guide Intro to Flutter theming by RydMike Home Flutter Theming Guide | RydMike Fluttering Skip to the content. ![]()
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