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HighContrast Theme

FATheme also provides the resources for HighContrast themes, in addition to the standard light and dark. HighContrast mode can be enabled automatically, if PreferSystemTheme is set to true, or you can directly set the RequestedThemeVariant to HighContrast.

To use the HighContrast theme directly, FATheme defines the ThemeVariant as a static field:

public static readonly ThemeVariant HighContrastTheme = new ThemeVariant("HighContrast", ThemeVariant.Light);


To set the HighContrast theme in Xaml

<Application RequestedThemeVariant="{x:Static sty:FluentAvaloniaTheme.HighContrastTheme}" />

To define a custom ThemeDictionary

<ResourceDictionary x:Key="{x:Static sty:FluentAvaloniaTheme.HighContrastTheme}" />

Unlike light and dark themes, the high contrast theme only uses 8 total colors. The defaults for these colors are taken from the default Windows 10 high contrast theme.

<Color x:Key="SystemColorWindowTextColor">#FFFFFF</Color>
<Color x:Key="SystemColorGrayTextColor">#FF3FF23F</Color>
<Color x:Key="SystemColorButtonFaceColor">#FF000000</Color>
<Color x:Key="SystemColorWindowColor">#FF000000</Color>
<Color x:Key="SystemColorButtonTextColor">#FFFFFF</Color>
<Color x:Key="SystemColorHighlightColor">#FF1AEBFF</Color>
<Color x:Key="SystemColorHighlightTextColor">#FF000000</Color>
<Color x:Key="SystemColorHotlightColor">#FFFE55</Color>

On Windows 11, if one of the high contrast variants is enabled, these colors will be updated to align with the system.