Parent Themes and Sub-Themes
Multiple themes can be combined in the same application by configuring one of them as a “parent theme” to the other. This is typically used for sharing a common base theme (packaged as a JAR dependency) across multiple applications, and loading application-specific themes on top of the base theme.
A theme is configured as a parent theme through the parent property in the theme configuration file theme.json in the application’s theme folder:
{
"parent": "my-base-theme"
}@Theme("my-application-theme")
public class Application implements AppShellConfigurator {
...
}In the example above, my-base-theme is loaded as the parent theme, and my-application-theme is loaded on top of it.
It’s also possible to load additional stylesheets dynamically on top of the application theme.