uno-toolkit-system-theme-helper
Use SystemThemeHelper to detect system theme (light/dark), check if dark mode is active, and set application theme. Provides static methods for theme retrieval and management.
Source facts
- Repository
- unoplatform/studio
- Last source activity
- June 9, 2026 at 19:39
- Detected SKILL.md language
- English
- Stars
- 10
- Forks
- 1
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- uno-toolkit-system-theme-helper
- description
- Use SystemThemeHelper to detect system theme (light/dark), check if dark mode is active, and set application theme. Provides static methods for theme retrieval and management.
- when_to_use
- Use when reading or programmatically switching dark / light mode from C# (not the XAML `ThemeResource` lookup path) โ detecting the current system theme, setting the application theme at runtime, or toggling between modes.
- metadata
- {"author":"uno-platform","version":"2.4","category":"toolkit"}
# Uno Toolkit SystemThemeHelper โ Agent Skill
## Workflow
> **Docs lookup:** call `uno_platform_docs_search(...)` first, then `uno_platform_docs_fetch(sourcePath="โฆ")` using the `sourcePath` field from a result (a relative `.md` path; add the result's `anchor` for a section). Never pass a URL, a `.html` link, or a hand-built path.
### Step 1: Fetch the SystemThemeHelper Documentation
```
uno_platform_docs_search("Uno Toolkit SystemThemeHelper theme light dark mode detect")
```
Primary documentation page:
- **SystemThemeHelper**: `external/uno.toolkit.ui/doc/helpers/SystemThemeHelper.md`
Fetch the page:
```
uno_platform_docs_fetch(sourcePath="external/uno.toolkit.ui/doc/helpers/SystemThemeHelper.md")
```
## Key Principles (Stable)
- `SystemThemeHelper.GetCurrentOsTheme()` โ returns `ApplicationTheme.Light` or `ApplicationTheme.Dark`
- `SystemThemeHelper.GetRootTheme(XamlRoot?)` โ gets the app theme for a given XamlRoot
- `SystemThemeHelper.IsRootInDarkMode(XamlRoot?)` โ quick check if dark mode is active
- `SystemThemeHelper.SetRootTheme(XamlRoot?, bool)` โ set theme (`true` = dark)
- `SystemThemeHelper.SetApplicationTheme(XamlRoot?, ElementTheme)` โ set theme using ElementTheme enum
- **No `ThemeChanged` event exists** โ there is no event to subscribe to for theme changes
- Namespace: `using Uno.Toolkit.UI;`
## Related Skills
- [[uno-themes-semantic-colors-brushes]] โ Semantic color palette and brush system
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