Qt: Dynamic languages

- get language as soon as possible (before creating any Qt objects) to make all
  translations working
- dynamic list of supported languages
- runtime change of GUI language (no need to restart application)
- add flags icons support
- search for *.qm languages in buildin resources, then
  data dir called "languages" (main directory in sources or
  /usr/share/wireshark/languages), then user directory
  (UNIX: ~/.wireshark/languages); "languages" directory should contains
  files wireshark_xx.qm where xx is language code (en, en_GB, etc.),
  and optional xx.svg for flag icon
- try to fix some untranslated manually-created UI items
  (need manual reset text of those components)

Change-Id: I62ca8a8cddce47cec9dbcad6b0bd68b6cfd92229
Reviewed-on: https://code.wireshark.org/review/5041
Tested-by: Michal Labedzki <michal.labedzki@tieto.com>
Reviewed-by: Michal Labedzki <michal.labedzki@tieto.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/ui/qt/wireshark_application.cpp b/ui/qt/wireshark_application.cpp
index 1362ca7f6b..a4f3595438 100644
--- a/ui/qt/wireshark_application.cpp
+++ b/ui/qt/wireshark_application.cpp
@@ -61,6 +61,8 @@
 #include <QEvent>
 #include <QFileOpenEvent>
 #include <QFontMetrics>
+#include <QLibraryInfo>
+#include <QLocale>
 #include <QMutableListIterator>
 #include <QTimer>
 #include <QUrl>
@@ -570,6 +572,7 @@ WiresharkApplication::WiresharkApplication(int &argc,  char **argv) :
     Q_INIT_RESOURCE(status);
     Q_INIT_RESOURCE(toolbar);
     Q_INIT_RESOURCE(wsicon);
+    Q_INIT_RESOURCE(languages);
 
 #ifdef Q_OS_WIN
     /* RichEd20.DLL is needed for native file dialog filter entries. */
@@ -866,6 +869,43 @@ void WiresharkApplication::addRecentItem(const QString &filename, qint64 size, b
     itemStatusFinished(filename, size, accessible);
 }
 
+static void switchTranslator(QTranslator& myTranslator, const QString& filename,
+    const QString& searchPath)
+{
+    wsApp->removeTranslator(&myTranslator);
+
+    if (myTranslator.load(filename, searchPath))
+        wsApp->installTranslator(&myTranslator);
+}
+
+void WiresharkApplication::loadLanguage(const QString& newLanguage)
+{
+    QLocale locale;
+    QString localeLanguage;
+
+    if (newLanguage.isEmpty() || newLanguage == "auto") {
+        localeLanguage = QLocale::system().name();
+    } else {
+        localeLanguage = newLanguage;
+    }
+
+    locale = QLocale(localeLanguage);
+    QLocale::setDefault(locale);
+    switchTranslator(wsApp->translator,
+            QString("wireshark_%1.qm").arg(localeLanguage), QString(":/i18n/"));
+    if (QFile::exists(QString("%1/%2/wireshark_%3.qm")
+            .arg(get_datafile_dir()).arg("languages").arg(localeLanguage)))
+        switchTranslator(wsApp->translator,
+                QString("wireshark_%1.qm").arg(localeLanguage), QString(get_datafile_dir()) + QString("/languages"));
+    if (QFile::exists(QString("%1/wireshark_%3.qm")
+            .arg(gchar_free_to_qstring(get_persconffile_path("languages", FALSE))).arg(localeLanguage)))
+        switchTranslator(wsApp->translator,
+                QString("wireshark_%1.qm").arg(localeLanguage), gchar_free_to_qstring(get_persconffile_path("languages", FALSE)));
+    switchTranslator(wsApp->translatorQt,
+            QString("qt_%1.qm").arg(localeLanguage),
+            QLibraryInfo::location(QLibraryInfo::TranslationsPath));
+}
+
 /*
  * Editor modelines
  *