Is there any way to detect which color and which type of windows style windows 10 is running one (the latest one I guess which has light/dark theme - 1903)
I have a tray icon app and would like to display a black/white icon depending on the theme. The built in apps show them properly, but I do not know how to detect it.
You can get current Theme information from the registry :
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes
(the GetCurrentThemeName api returns InstallVisualStyle value on my Windows 10 OS)
Declaration :
[DllImport("UxTheme.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern int GetCurrentThemeName(StringBuilder pszThemeFileName, int cchMaxNameChars, StringBuilder pszColorBuff, int cchMaxColorChars, StringBuilder pszSizeBuff, int cchMaxSizeChars);
To get the current Theme color (Accent color), you can do :
[DllImport("Uxtheme.dll", SetLastError = true, CharSet = CharSet.Auto, EntryPoint = "#95")]
public static extern int GetImmersiveColorFromColorSetEx(int dwImmersiveColorSet, int dwImmersiveColorType, bool bIgnoreHighContrast, int dwHighContrastCacheMode);
[DllImport("Uxtheme.dll", SetLastError = true, CharSet = CharSet.Auto, EntryPoint = "#96")]
public static extern int GetImmersiveColorTypeFromName(IntPtr pName);
[DllImport("Uxtheme.dll", SetLastError = true, CharSet = CharSet.Auto, EntryPoint = "#98")]
public static extern int GetImmersiveUserColorSetPreference(bool bForceCheckRegistry, bool bSkipCheckOnFail);
int nColorSystemAccent = GetImmersiveColorFromColorSetEx(GetImmersiveUserColorSetPreference(false, false), GetImmersiveColorTypeFromName(Marshal.StringToHGlobalUni("ImmersiveSystemAccent")), false, 0);
System.Drawing.Color colorSystemAccent = ColorTranslator.FromWin32(nColorSystemAccent);
// Test color
this.BackColor = colorSystemAccent;