public static void ChangeAppStyle(Window window, Accent newAccent, AppTheme newTheme)
{
if (window == null)
{
throw new ArgumentNullException(nameof(window));
}
var oldTheme = DetectAppStyle(window);
ChangeAppStyle(window.Resources, oldTheme, newAccent, newTheme);
}
public static void ChangeAppStyle(Application app, Accent newAccent, AppTheme newTheme)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
var oldTheme = DetectAppStyle(app);
ChangeAppStyle(app.Resources, oldTheme, newAccent, newTheme);
}
public static void ChangeAppStyle(ResourceDictionary resources, Accent newAccent, AppTheme newTheme)
{
if (resources == null)
{
throw new ArgumentNullException(nameof(resources));
}
if (newAccent == null)
{
throw new ArgumentNullException(nameof(newAccent));
}
if (newTheme == null)
{
throw new ArgumentNullException(nameof(newTheme));
}
ApplyResourceDictionary(newAccent.Resources, resources);
ApplyResourceDictionary(newTheme.Resources, resources);
}
/// <summary>
/// Creates a new instance of this class.
/// </summary>
public OnThemeChangedEventArgs(AppTheme appTheme, Accent accent)
{
this.AppTheme = appTheme;
this.Accent = accent;
}
private static void OnThemeChanged(Accent newAccent, AppTheme newTheme)
{
IsThemeChanged?.Invoke(Application.Current, new OnThemeChangedEventArgs(newTheme, newAccent));
}
private static void ChangeAppStyle(ResourceDictionary resources, Tuple <AppTheme, Accent> oldThemeInfo, Accent newAccent, AppTheme newTheme)
{
var themeChanged = false;
if (oldThemeInfo != null)
{
var oldAccent = oldThemeInfo.Item2;
if (oldAccent != null && oldAccent.Name != newAccent.Name)
{
resources.MergedDictionaries.Add(newAccent.Resources);
var key = oldAccent.Resources.Source.ToString().ToLower();
var oldAccentResource = resources.MergedDictionaries.Where(x => x.Source != null).FirstOrDefault(d => d.Source.ToString().ToLower() == key);
if (oldAccentResource != null)
{
resources.MergedDictionaries.Remove(oldAccentResource);
}
themeChanged = true;
}
var oldTheme = oldThemeInfo.Item1;
if (oldTheme != null && oldTheme != newTheme)
{
resources.MergedDictionaries.Add(newTheme.Resources);
var key = oldTheme.Resources.Source.ToString().ToLower();
var oldThemeResource = resources.MergedDictionaries.Where(x => x.Source != null).FirstOrDefault(d => d.Source.ToString().ToLower() == key);
if (oldThemeResource != null)
{
resources.MergedDictionaries.Remove(oldThemeResource);
}
themeChanged = true;
}
}
else
{
ChangeAppStyle(resources, newAccent, newTheme);
themeChanged = true;
}
if (themeChanged)
{
OnThemeChanged(newAccent, newTheme);
}
}