addTitle method
Adds a title with the specified text, language, and encoding.
Implementation
void addTitle(
String text, {
String language = 'en',
TextEncoding encoding = TextEncoding.UTF8,
}) {
_titleRecords.add(
TextRecord(language: language, text: text, encoding: encoding),
);
if (_titleLanguages.contains(language)) {
throw ArgumentError(
"Language of titles can not be repeated, got $language",
);
}
_titleLanguages.add(language);
}