What is the themeResource for window's title text color?

Question

This title bar text color changes between black and white depending on currently selected system color (white text on darker backgrounds and black text on lighter backgrounds)

What is the ThemeResource for that color?

I have a button with a background set to SystemControlBackgroundAccentBrush and I would like to have this effect of adjusting foreground (font color) depending on currently selected accent.

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I tried SystemControlForegroundAccentBrush but it seems like this and SystemControlBackgroundAccentBrush are the same colors (and I hadn't changed anything in system settings).

Answer 1

There is not a single brush that will do the trick.

Avoid using the accent color as a background, especially for text and icons. Because the accent color can change, if you must use it as a background, there’s some additional work you must do to ensure that foreground text is easy to read. (Source: UWP Style Guide)

Building on the example algorithm they propose using in the documentation, this should do the trick:

private void UpdateAccentColorForeground(FrameworkElement element)
{
    var uiSettings = new UISettings();
    Color c = uiSettings.GetColorValue(UIColorType.Accent);

    element.RequestedTheme = ((5 * c.G + 2 * c.R + c.B) <= 8 * 128)
        ? ElementTheme.Light
        : ElementTheme.Dark;
}