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gui-theme — System Theme Detection

import('gui-theme') provides Windows system theme detection for dark mode, high contrast mode, and accent color via registry queries.

Quick Start

theme := import('gui-theme')

if theme.isDarkMode?() -> {
    println('Dark mode is active')
    bg := [30, 30, 30]
} else {
    println('Light mode')
    bg := [255, 255, 255]
}

if theme.isHighContrast?() -> {
    println('High contrast mode — use system colors')
}

accent := theme.accentColor()
if accent != ? -> {
    println('Accent: rgb(' + string(accent.r) + ',' + string(accent.g) + ',' + string(accent.b) + ')')
}

API Reference

isDarkMode?()

Checks if dark mode is active by reading AppsUseLightTheme from the registry. Returns true if dark mode is enabled, false otherwise.

isHighContrast?()

Checks if Windows high contrast mode is enabled via SystemParametersInfo. Returns true/false.

accentColor()

Gets the user's accent color from the registry. Returns {r, g, b} or ? if unavailable.

Notes

  • Theme detection reads from HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize.
  • Accent color is read from HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM\AccentColor.
  • These are point-in-time queries; the module does not watch for theme changes. Re-query periodically or after WM_SETTINGCHANGE if you need live updates.