Add translation bar dropdown menu.

Telegram/SourceFiles/lang/lang_instance.cpp

@@ -21,7 +21,6 @@ namespace {
 
 const auto kSerializeVersionTag = u"#new"_q;
 constexpr auto kSerializeVersion = 1;
-constexpr auto kDefaultLanguage = "en"_cs;
 constexpr auto kCloudLangPackName = "tdesktop"_cs;
 constexpr auto kCustomLanguage = "#custom"_cs;
 constexpr auto kLangValuesLimit = 20000;
@@ -213,14 +212,6 @@ void ParseKeyValue(
 
 } // namespace
 
-QString DefaultLanguageId() {
-	return kDefaultLanguage.utf16();
-}
-
-QString LanguageIdOrDefault(const QString &id) {
-	return !id.isEmpty() ? id : DefaultLanguageId();
-}
-
 QString CloudLangPackName() {
 	return kCloudLangPackName.utf16();
 }

Telegram/SourceFiles/lang/lang_instance.h

@@ -7,8 +7,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
-#include <rpl/producer.h>
 #include "lang_auto.h"
+#include "base/const_string.h"
 #include "base/weak_ptr.h"
 
 namespace Lang {
@@ -31,8 +31,6 @@ inline bool operator!=(const Language &a, const Language &b) {
 	return !(a == b);
 }
 
-QString DefaultLanguageId();
-QString LanguageIdOrDefault(const QString &id);
 QString CloudLangPackName();
 QString CustomLanguageId();
 Language DefaultLanguage();

Telegram/SourceFiles/lang/lang_keys.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "lang/lang_keys.h"
 
+#include "base/const_string.h"
 #include "lang/lang_file_parser.h"
 #include "ui/integration.h"
 
@@ -14,6 +15,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 namespace {
 
+constexpr auto kDefaultLanguage = "en"_cs;
+
 template <typename WithYear, typename WithoutYear>
 inline QString langDateMaybeWithYear(
 		QDate date,
@@ -231,3 +234,15 @@ QString langDateTimeFull(const QDateTime &date) {
 		lt_time,
 		QLocale().toString(date.time(), QLocale::ShortFormat));
 }
+
+namespace Lang {
+
+QString DefaultLanguageId() {
+	return kDefaultLanguage.utf16();
+}
+
+QString LanguageIdOrDefault(const QString &id) {
+	return !id.isEmpty() ? id : DefaultLanguageId();
+}
+
+} // namespace Lang

Telegram/SourceFiles/lang/lang_keys.h

@@ -34,5 +34,7 @@ namespace Lang {
 [[nodiscard]] QString Id();
 [[nodiscard]] rpl::producer<> Updated();
 [[nodiscard]] QString GetNonDefaultValue(const QByteArray &key);
+[[nodiscard]] QString DefaultLanguageId();
+[[nodiscard]] QString LanguageIdOrDefault(const QString &id);
 
 } // namespace Lang