private bool IsBaseTheme(string featureId, string themeId)
{
// determine if the given feature is a base theme of the given theme
var availableFeatures = _extensionManager.GetExtensions().Features;
var themeFeature = availableFeatures.SingleOrDefault(fd => fd.Id == themeId);
while (themeFeature != null && themeFeature.Extension.Manifest.IsTheme())
{
var themeExtensionInfo = new ThemeExtensionInfo(themeFeature.Extension);
if (!themeExtensionInfo.HasBaseTheme())
{
return(false);
}
if (themeExtensionInfo.IsBaseThemeFeature(featureId))
{
return(true);
}
themeFeature = availableFeatures.SingleOrDefault(fd => fd.Id == themeExtensionInfo.BaseTheme);
}
return(false);
}
private IEnumerable <IExtensionInfo> GetBaseThemes(IExtensionInfo theme, string adminThemeId, IEnumerable <IExtensionInfo> extensions)
{
if (theme?.Id.Equals(adminThemeId, StringComparison.OrdinalIgnoreCase) ?? false)
{
return(extensions.Where(e => e.Manifest.IsTheme() && e.Id != adminThemeId));
}
else
{
var list = new List <IExtensionInfo>();
if (theme == null)
{
return(list);
}
var themeInfo = new ThemeExtensionInfo(theme);
while (true)
{
if (!themeInfo.HasBaseTheme())
{
break;
}
var baseTheme = extensions.FirstOrDefault(e => themeInfo.IsBaseThemeFeature(e.Id));
if (baseTheme == null || list.Contains(baseTheme))
{
break;
}
list.Add(baseTheme);
theme = baseTheme;
}
return(list);
}
}