refactor: settings & language

ui/extends/shared/language.py

@@ -0,0 +1,66 @@
+from PySide6.QtCore import QEvent, QLibraryInfo, QLocale, QObject, QTranslator
+from PySide6.QtWidgets import QApplication
+
+INSTALLED_TRANSLATORS = []
+
+
+def changeAppLanguage(
+    locale: QLocale,
+    fallbackLocale: QLocale = QLocale("en_US"),
+):
+    app = QApplication.instance()
+
+    for translator in INSTALLED_TRANSLATORS:
+        app.removeTranslator(translator)
+
+    translator = QTranslator()
+    translatorLoadSuccess = translator.load(locale, "", "", ":/lang/")
+    if not translatorLoadSuccess:
+        translator.load(fallbackLocale, "", "", ":/lang/")
+    qtTranslator = QTranslator()
+    qtTranslatorLoadSuccess = qtTranslator.load(
+        locale,
+        "qt",
+        "_",
+        QLibraryInfo.path(QLibraryInfo.LibraryPath.TranslationsPath),
+    )
+    if not qtTranslatorLoadSuccess:
+        qtTranslator.load(
+            fallbackLocale,
+            "qt",
+            "_",
+            QLibraryInfo.path(QLibraryInfo.LibraryPath.TranslationsPath),
+        )
+
+    app.installTranslator(translator)
+    INSTALLED_TRANSLATORS.append(translator)
+    app.installTranslator(qtTranslator)
+    INSTALLED_TRANSLATORS.append(qtTranslator)
+
+
+def localeToCode(locale: QLocale):
+    code = QLocale.languageToCode(locale.language())
+    country = locale.country()
+    if country and country != QLocale.Country.AnyCountry:
+        code += f"_{QLocale.countryToCode(country)}"
+    return code
+
+
+def localeToFullName(locale: QLocale):
+    ret = QLocale.languageToString(locale.language())
+    country = locale.country()
+    if country and country != QLocale.Country.AnyCountry:
+        ret += f" ({QLocale.countryToString(country)})"
+    return ret
+
+
+class LanguageChangeEventFilter(QObject):
+    def eventFilter(self, watched: QObject, event: QEvent) -> bool:
+        if (
+            event.type() == QEvent.Type.LanguageChange
+            and hasattr(watched, "retranslateUi")
+            and callable(watched.retranslateUi)
+        ):
+            watched.retranslateUi(watched)
+
+        return super().eventFilter(watched, event)