// Adapted from: https://engy.us/blog/2018/10/20/dark-theme-in-wpf/
private void WatchTheme()
{
var currentUser = WindowsIdentity.GetCurrent();
string query = string.Format(
CultureInfo.InvariantCulture,
ManagementQuery,
currentUser.User.Value,
RegistryKeyPath.Replace(@"\", @"\\"),
RegistryValueName);
try
{
var watcher = new ManagementEventWatcher(query);
watcher.EventArrived += (o, e) => _dispatcher.Invoke(() => SystemThemeChanged?.Invoke(this, null));
// Start listening for events
watcher.Start();
}
catch (Exception)
{
// This can fail on Windows 7
}
SystemParameters.StaticPropertyChanged += (sender, args) =>
{
if (args.PropertyName == nameof(SystemParameters.HighContrast))
{
SystemThemeChanged?.Invoke(this, new EventArgs());
}
};
}
private static void UpdateTheme()
{
bool isSystemLightTheme = GetIsSystemLightTheme();
var args = new SystemThemeChangedEventArgs(isSystemLightTheme);
SystemThemeChanged?.Invoke(null, args);
}
private void SystemEvents_UserPreferenceChanged(object sender, UserPreferenceChangedEventArgs e)
{
// This event is raised when the theme is changed,
// but also for various other irrelevant reasons.
// Check the registry first, before forcing the application
// to refresh everything.
var newTheme = _themeHelper.GetSystemTheme();
if (newTheme != _currentTheme)
{
_currentTheme = newTheme;
SystemThemeChanged?.Invoke(this, EventArgs.Empty);
}
}
private void UpdateColorValues()
{
var background = _uiSettings.GetColorValue(UIColorType.Background).ToColor();
if (_systemBackground != background)
{
_systemBackground = background;
UpdateSystemAppTheme();
SystemThemeChanged?.Invoke(null, EventArgs.Empty);
}
var accent = _uiSettings.GetColorValue(UIColorType.Accent).ToColor();
if (_systemAccent != accent)
{
_systemAccent = accent;
SystemAccentColorChanged?.Invoke(null, EventArgs.Empty);
}
}
private void ListenToSystemColorChanges()
{
var uiSettings = new UISettings();
_systemBackground = uiSettings.GetColorValue(UIColorType.Background).ToColor();
_systemAccent = uiSettings.GetColorValue(UIColorType.Accent).ToColor();
uiSettings.ColorValuesChanged += (sender, args) =>
{
#if DEBUG
//for (int i = 0; i <= 8; i++)
//{
// var colorType = (UIColorType)i;
// Debug.WriteLine(colorType + " = " + sender.GetColorValue(colorType));
//}
#endif
var background = sender.GetColorValue(UIColorType.Background).ToColor();
if (_systemBackground != background)
{
_systemBackground = background;
UpdateSystemAppTheme();
SystemThemeChanged?.Invoke(null, EventArgs.Empty);
}
var accent = sender.GetColorValue(UIColorType.Accent).ToColor();
if (_systemAccent != accent)
{
_systemAccent = accent;
AccentColorChanged?.Invoke(null, EventArgs.Empty);
}
};
_uiSettings = uiSettings;
UpdateSystemAppTheme();
}
public void ManuallyTriggerThemeEvent()
{
SystemThemeChanged?.Invoke(this, new EventArgs());
}
private void _systemWatcher_EventArrived(object sender, EventArrivedEventArgs e) => SystemThemeChanged?.Invoke(null, new ThemeChangedEventArg(GetTheme(ThemeType.System)));
private void ApplicationPreferDarkThemeHandler(object o, GLib.NotifyArgs args) => SystemThemeChanged?.Invoke(o, EventArgs.Empty);
