@NonNullApi @NonNullFields
See: Description
| Class | Description | 
|---|---|
| DelegatingThemeSource | Empty ThemeSource that delegates all calls to the parent ThemeSource. | 
| ResourceBundleThemeSource | ThemeSourceimplementation that looks up an individualResourceBundleper theme. | 
| SimpleTheme | Default  Themeimplementation, wrapping a name and an
 underlyingMessageSource. | 
| UiApplicationContextUtils | Utility class for UI application context implementations. |