private static void ApplyThemeInternal(this FrameworkElement control, Theme? theme, SolidColorBrush accentBrush, SolidColorBrush contrastBrush) { ValidationHelper.NotNull(control, () => control); // Resource dictionaries paths var lightBrushesUri = new Uri("/Elysium;component/Themes/LightBrushes.xaml", UriKind.Relative); var darkBrushesUri = new Uri("/Elysium;component/Themes/DarkBrushes.xaml", UriKind.Relative); // Resource dictionaries var lightBrushesDictionary = new ResourceDictionary { Source = lightBrushesUri }; var darkBrushesDictionary = new ResourceDictionary { Source = darkBrushesUri }; if (theme == Theme.Light) { // Add LightBrushes.xaml, if not included if (control.Resources.MergedDictionaries.All(dictionary => dictionary.Source != lightBrushesUri)) { control.Resources.MergedDictionaries.Add(lightBrushesDictionary); } // Remove DarkBrushes.xaml, if included var darkColorsDictionaries = control.Resources.MergedDictionaries.Where(dictionary => dictionary.Source == darkBrushesUri).ToList(); foreach (var dictionary in darkColorsDictionaries) { control.Resources.MergedDictionaries.Remove(dictionary); } } if (theme == Theme.Dark) { // Add DarkBrushes.xaml, if not included if (control.Resources.MergedDictionaries.All(dictionary => dictionary.Source != darkBrushesUri)) { control.Resources.MergedDictionaries.Add(darkBrushesDictionary); } // Remove LightBrushes.xaml, if included var lightColorsDictionaries = control.Resources.MergedDictionaries.Where(dictionary => dictionary.Source == lightBrushesUri).ToList(); foreach (var dictionary in lightColorsDictionaries) { control.Resources.MergedDictionaries.Remove(dictionary); } } // Bug in WPF 4: http://connect.microsoft.com/VisualStudio/feedback/details/555322/global-wpf-styles-are-not-shown-when-using-2-levels-of-references if (control.Resources.Keys.Count == 0) { control.Resources.Add(typeof(Window), new Style(typeof(Window))); } if (accentBrush != null) { var accentBrushFrozen = !accentBrush.IsFrozen && accentBrush.CanFreeze ? accentBrush.GetAsFrozen() : accentBrush; if (control.Resources.Contains("AccentBrush")) { // Set AccentBrush value, if key exist control.Resources["AccentBrush"] = accentBrushFrozen; } else { // Add AccentBrush key and value, if key doesn't exist control.Resources.Add("AccentBrush", accentBrushFrozen); } } if (contrastBrush != null) { var contrastBrushFrozen = !contrastBrush.IsFrozen && contrastBrush.CanFreeze ? contrastBrush.GetAsFrozen() : contrastBrush; if (control.Resources.Contains("ContrastBrush")) { // Set ContrastBrush value, if key exist control.Resources["ContrastBrush"] = contrastBrushFrozen; } else { // Add ContrastBrush key and value, if key doesn't exist control.Resources.Add("ContrastBrush", contrastBrushFrozen); } var semitransparentContrastBrush = contrastBrush.Clone(); semitransparentContrastBrush.Opacity = 1d / 8d; var semitransparentContrastBrushFrozen = !semitransparentContrastBrush.IsFrozen && semitransparentContrastBrush.CanFreeze ? semitransparentContrastBrush.GetAsFrozen() : semitransparentContrastBrush; if (control.Resources.Contains("SemitransparentContrastBrush")) { // Set SemitransparentContrastBrush value, if key exist control.Resources["SemitransparentContrastBrush"] = semitransparentContrastBrushFrozen; } else { // Add SemitransparentContrastBrush key and value, if key doesn't exist control.Resources.Add("SemitransparentContrastBrush", semitransparentContrastBrushFrozen); } } // Add Generic.xaml, if not included var genericDictionaryUri = new Uri("/Elysium;component/Themes/Generic.xaml", UriKind.Relative); if (control.Resources.MergedDictionaries.All(dictionary => dictionary.Source != genericDictionaryUri)) { control.Resources.MergedDictionaries.Add(new ResourceDictionary { Source = genericDictionaryUri }); } OnThemeChanged(); }