private void InitStylesVariationCategories(List <StyleOption> givenOptions, Dictionary <string, List <StyleVariant> > givenVariants, string targetStyle) { Logger.Log("Init variation stage begins"); _styleOptions = givenOptions ?? OptionsFactory.GetStylesVariationOptions(targetStyle); _styleVariants = givenVariants ?? VariantsFactory.GetVariants(targetStyle); VariantsCategory.Clear(); foreach (var styleVariant in _styleVariants.Keys) { VariantsCategory.Add(styleVariant); } CurrentVariantCategoryId.Number = 0; _previousVariantsCategory = VariantsCategory[0]; // default style options (in preview stage) var defaultStyleOptions = OptionsFactory.GetStylesPreviewOption(targetStyle); var currentVariants = _styleVariants.Values.First(); var variantIndexWithoutEffect = -1; for (var i = 0; i < currentVariants.Count; i++) { if (currentVariants[i].IsNoEffect(defaultStyleOptions)) { variantIndexWithoutEffect = i; break; } } // swap the no-effect variant with the current selected style's corresponding variant // so that to achieve continuity. // in order to swap, style option provided from StyleOptionsFactory should have // corresponding values specified in StyleVariantsFactory. e.g., an option generated // from factory has overlay transparency of 35, then in order to swap, it should have // a variant of overlay transparency of 35. Otherwise it cannot swap, because variants // don't match any values in the style options. if (variantIndexWithoutEffect != -1 && givenOptions == null) { // swap style variant var tempVariant = currentVariants[variantIndexWithoutEffect]; currentVariants[variantIndexWithoutEffect] = currentVariants[0]; currentVariants[0] = tempVariant; // swap default style options (in variation stage) var tempStyleOpt = _styleOptions[variantIndexWithoutEffect]; _styleOptions[variantIndexWithoutEffect] = _styleOptions[0]; _styleOptions[0] = tempStyleOpt; } for (var i = 0; i < currentVariants.Count && i < _styleOptions.Count; i++) { currentVariants[i].Apply(_styleOptions[i]); } Logger.Log("Init variation stage done"); }