avalonia-styling

Avalonia styling is defined using Style selectors for per-control appearance and ControlTheme definitions to replace entire control visuals. This mechanism supports pseudoclasses, nesting, and resource references to create consistent, scalable UI themes.

To create an Avalonia style, define a Window.Styles block with a Style targeting a control like TextBlock. Include a :pointerover pseudoclass selector within this block to observe interactive styling changes when the user hovers over the control.

The best way to switch between Light and Dark theme variants in Avalonia is by using dynamic theme variants. This feature allows your application to switch between Light, Dark, and other custom themes at runtime dynamically.

Use an Avalonia ControlTheme when you need to replace the entire visual appearance of a control for complete restyling. Use a standard Style when you only need to define per-control appearance using selectors, pseudoclasses, and resource references.

Yes, you can compose styles across an Avalonia app by using shared resource dictionaries. This allows you to define and reuse styles, control themes, and theme variants consistently across different windows and controls.