Deploy base Qt translations when needed

CMakeLists.txt

@@ -19,6 +19,14 @@ if(OPENMW_GL4ES_MANUAL_INIT)
     add_definitions(-DOPENMW_GL4ES_MANUAL_INIT)
 endif()
 
+if (APPLE OR WIN32)
+    set(DEPLOY_QT_TRANSLATIONS_DEFAULT ON)
+else ()
+    set(DEPLOY_QT_TRANSLATIONS_DEFAULT OFF)
+endif ()
+
+option(DEPLOY_QT_TRANSLATIONS "Deploy standard Qt translations to resources folder. Needed when OpenMW applications are deployed with Qt libraries" ${DEPLOY_QT_TRANSLATIONS_DEFAULT})
+
 # Apps and tools
 option(BUILD_OPENMW             "Build OpenMW" ON)
 option(BUILD_LAUNCHER           "Build Launcher" ON)
@@ -1099,13 +1107,13 @@ if (USE_QT)
 
     if (BUILD_LAUNCHER OR BUILD_WIZARD)
         if (APPLE)
-            set(QT_TRANSLATIONS_PATH "${APP_BUNDLE_DIR}/Contents/Resources/resources/translations")
+            set(QT_OPENMW_TRANSLATIONS_PATH "${APP_BUNDLE_DIR}/Contents/Resources/resources/translations")
         else ()
             get_generator_is_multi_config(multi_config)
             if (multi_config)
-                set(QT_TRANSLATIONS_PATH "${OpenMW_BINARY_DIR}/$<CONFIG>/resources/translations")
+                set(QT_OPENMW_TRANSLATIONS_PATH "${OpenMW_BINARY_DIR}/$<CONFIG>/resources/translations")
             else ()
-                set(QT_TRANSLATIONS_PATH "${OpenMW_BINARY_DIR}/resources/translations")
+                set(QT_OPENMW_TRANSLATIONS_PATH "${OpenMW_BINARY_DIR}/resources/translations")
             endif ()
         endif ()
 
@@ -1121,9 +1129,30 @@ if (USE_QT)
 
         qt_add_translation(QM_FILES ${TS_FILES} OPTIONS -silent)
 
+        if (DEPLOY_QT_TRANSLATIONS)
+            # Once we set a Qt 6.2.0 as a minimum required version, we may use "qtpaths --qt-query" instead.
+            get_target_property(QT_QMAKE_EXECUTABLE Qt::qmake IMPORTED_LOCATION)
+            execute_process(COMMAND "${QT_QMAKE_EXECUTABLE}" -query QT_INSTALL_TRANSLATIONS
+                OUTPUT_VARIABLE QT_TRANSLATIONS_DIR OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+            foreach(QM_FILE ${QM_FILES})
+                get_filename_component(QM_BASENAME ${QM_FILE} NAME)
+                string(REGEX REPLACE "[^_]+_(.*)\\.qm" "\\1" LANG_NAME ${QM_BASENAME})
+                if (EXISTS "${QT_TRANSLATIONS_DIR}/qtbase_${LANG_NAME}.qm")
+                    set(QM_FILES ${QM_FILES} "${QT_TRANSLATIONS_DIR}/qtbase_${LANG_NAME}.qm")
+                elseif (EXISTS "${QT_TRANSLATIONS_DIR}/qt_${LANG_NAME}.qm")
+                    set(QM_FILES ${QM_FILES} "${QT_TRANSLATIONS_DIR}/qt_${LANG_NAME}.qm")
+                else ()
+                    message(FATAL_ERROR "Qt translations for '${LANG_NAME}' locale are not found in the '${QT_TRANSLATIONS_DIR}' folder.")
+                endif ()
+            endforeach(QM_FILE)
+
+            list(REMOVE_DUPLICATES QM_FILES)
+        endif ()
+
         add_custom_target(qm-files
-            COMMAND ${CMAKE_COMMAND} -E make_directory ${QT_TRANSLATIONS_PATH}
-            COMMAND ${CMAKE_COMMAND} -E copy_if_different ${QM_FILES} ${QT_TRANSLATIONS_PATH}
+            COMMAND ${CMAKE_COMMAND} -E make_directory ${QT_OPENMW_TRANSLATIONS_PATH}
+            COMMAND ${CMAKE_COMMAND} -E copy_if_different ${QM_FILES} ${QT_OPENMW_TRANSLATIONS_PATH}
             DEPENDS ${QM_FILES}
             COMMENT "Copy *.qm files to resources folder")
     endif ()

apps/launcher/main.cpp

@@ -1,7 +1,6 @@
 #include <iostream>
 
 #include <QDir>
-#include <QTranslator>
 
 #include <boost/program_options/options_description.hpp>
 #include <boost/program_options/variables_map.hpp>
@@ -9,6 +8,7 @@
 #include <components/debug/debugging.hpp>
 #include <components/files/configurationmanager.hpp>
 #include <components/files/qtconversion.hpp>
+#include <components/l10n/qttranslations.hpp>
 #include <components/platform/platform.hpp>
 
 #ifdef MAC_OS_X_VERSION_MIN_REQUIRED
@@ -41,16 +41,7 @@ int runLauncher(int argc, char* argv[])
             resourcesPath = Files::pathToQString(variables["resources"].as<Files::MaybeQuotedPath>().u8string());
         }
 
-        // Internationalization
-        QString locale = QLocale::system().name().section('_', 0, 0);
-
-        QTranslator appTranslator;
-        appTranslator.load(resourcesPath + "/translations/launcher_" + locale + ".qm");
-        app.installTranslator(&appTranslator);
-
-        QTranslator componentsAppTranslator;
-        componentsAppTranslator.load(resourcesPath + "/translations/components_" + locale + ".qm");
-        app.installTranslator(&componentsAppTranslator);
+        l10n::installQtTranslations(app, "launcher", resourcesPath);
 
         Launcher::MainDialog mainWin(configurationManager);
 

apps/wizard/main.cpp

@@ -1,11 +1,11 @@
 #include <QApplication>
 #include <QDir>
-#include <QTranslator>
 
 #include <boost/program_options/options_description.hpp>
 #include <boost/program_options/variables_map.hpp>
 
 #include <components/files/qtconversion.hpp>
+#include <components/l10n/qttranslations.hpp>
 
 #include "mainwizard.hpp"
 
@@ -45,16 +45,7 @@ int main(int argc, char* argv[])
         resourcesPath = Files::pathToQString(variables["resources"].as<Files::MaybeQuotedPath>().u8string());
     }
 
-    // Internationalization
-    QString locale = QLocale::system().name().section('_', 0, 0);
-
-    QTranslator appTranslator;
-    appTranslator.load(resourcesPath + "/translations/wizard_" + locale + ".qm");
-    app.installTranslator(&appTranslator);
-
-    QTranslator componentsAppTranslator;
-    componentsAppTranslator.load(resourcesPath + "/translations/components_" + locale + ".qm");
-    app.installTranslator(&componentsAppTranslator);
+    l10n::installQtTranslations(app, "wizard", resourcesPath);
 
     Wizard::MainWizard wizard;
 

components/CMakeLists.txt

@@ -500,11 +500,16 @@ if (USE_QT)
         model/loadordererror
         view/combobox view/contentselector
         )
+
     add_component_qt_dir (config
         gamesettings
         launchersettings
         )
 
+    add_component_qt_dir (l10n
+        qttranslations
+        )
+
     add_component_qt_dir (process
         processinvoker
         )

components/l10n/qttranslations.cpp

@@ -0,0 +1,37 @@
+#include "qttranslations.hpp"
+
+#include <QLibraryInfo>
+#include <QLocale>
+
+namespace l10n
+{
+    QTranslator AppTranslator{};
+    QTranslator ComponentsTranslator{};
+    QTranslator QtBaseAppTranslator{};
+
+    void installQtTranslations(QApplication& app, const QString& appName, const QString& resourcesPath)
+    {
+        // Try to load OpenMW translations from resources folder first.
+        // If we loaded them, try to load Qt translations from both
+        // resources folder and default translations folder as well.
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        auto qtPath = QLibraryInfo::path(QLibraryInfo::TranslationsPath);
+#else
+        auto qtPath = QLibraryInfo::location(QLibraryInfo::TranslationsPath);
+#endif
+        auto localPath = resourcesPath + "/translations";
+
+        if (AppTranslator.load(QLocale::system(), appName, "_", localPath)
+            && ComponentsTranslator.load(QLocale::system(), "components", "_", localPath))
+        {
+            app.installTranslator(&AppTranslator);
+            app.installTranslator(&ComponentsTranslator);
+
+            if (QtBaseAppTranslator.load(QLocale::system(), "qtbase", "_", localPath)
+                || QtBaseAppTranslator.load(QLocale::system(), "qt", "_", localPath)
+                || QtBaseAppTranslator.load(QLocale::system(), "qtbase", "_", qtPath)
+                || QtBaseAppTranslator.load(QLocale::system(), "qt", "_", qtPath))
+                app.installTranslator(&QtBaseAppTranslator);
+        }
+    }
+}

components/l10n/qttranslations.hpp

@@ -0,0 +1,16 @@
+#ifndef COMPONENTS_L10N_QTTRANSLATIONS_H
+#define COMPONENTS_L10N_QTTRANSLATIONS_H
+
+#include <QApplication>
+#include <QTranslator>
+
+namespace l10n
+{
+    extern QTranslator AppTranslator;
+    extern QTranslator ComponentsTranslator;
+    extern QTranslator QtBaseAppTranslator;
+
+    void installQtTranslations(QApplication& app, const QString& appName, const QString& resourcesPath);
+}
+
+#endif // COMPONENTS_L10N_QTTRANSLATIONS_H