[the "translation" patch series] Part 4: translating the LyX menu on the mac

* development/MacOSX/Makefile.am: when installing, create bogus 
	language directories to allow translation through Qt.

	* src/frontends/qt4/GuiApplication.cpp (MenuTranslator): new class, 
	redirects some Qt translation requests to gettext.
	(GuiApplication): install the MenuTranslator.



git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19354 a592a061-630c-0410-9148-cb99ea01b6c8

development/MacOSX/Makefile.am

@@ -1,5 +1,7 @@
 include $(top_srcdir)/config/common.am
 
+LINGUAS = $(srcdir)/../../po/LINGUAS
+
 SUBDIRS = spotlight
 
 bundledir = ${prefix}/Contents
@@ -9,3 +11,9 @@ dist_bin_SCRIPTS = lyxeditor
 
 dist_pkgdata_DATA = COPYING LyXapp.icns LyX.icns lyxrc.dist
 
+
+install-data-hook:
+	LINGUAS_=`sed -e "/^#/d" -e "s/#.*//" $(LINGUAS)`; \
+	for f in $$LINGUAS_ ; do \
+	  $(MKDIR_P) $(pkgdatadir)/$$f.lproj ; \
+	done

src/frontends/qt4/GuiApplication.cpp

@@ -31,6 +31,7 @@
 #include "Color.h"
 #include "debug.h"
 #include "FuncRequest.h"
+#include "gettext.h"
 #include "LyX.h"
 #include "LyXFunc.h"
 #include "LyXRC.h"
@@ -119,9 +120,9 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
 	if (qt_trans_.load(language_name,
 		QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
 	{
-		qApp->installTranslator(&qt_trans_);
+		installTranslator(&qt_trans_);
 		// even if the language calls for RtL, don't do that
-		qApp->setLayoutDirection(Qt::LeftToRight);
+		setLayoutDirection(Qt::LeftToRight);
 		LYXERR(Debug::GUI)
 			<< "Successfully installed Qt translations for locale "
 			<< fromqstr(language_name) << std::endl;
@@ -130,6 +131,11 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
 			<< "Could not find  Qt translations for locale "
 			<< fromqstr(language_name) << std::endl;
 
+#ifdef Q_WS_MACX
+	// This allows to translate the strings that appear in the LyX menu.
+	addMenuTranslator();
+#endif
+
 	using namespace lyx::graphics;
 
 	Image::newImage = boost::bind(&QLImage::newImage);
@@ -343,6 +349,38 @@ bool GuiApplication::x11EventFilter(XEvent * xev)
 #endif
 
 
+////////////////////////////////////////////////////////////////////////
+// Mac specific stuff goes here...
+
+class MenuTranslator : public QTranslator {
+public:
+	virtual ~MenuTranslator() {};
+	virtual QString translate(const char * context, 
+				  const char * sourceText, 
+				  const char * comment = 0) const;
+};
+
+
+QString MenuTranslator::translate(const char * /*context*/, 
+				  const char * sourceText, 
+				  const char *) const
+{
+	string const s = sourceText;
+	if (s == N_("About %1")	|| s == N_("Preferences") 
+	    || s == N_("Reconfigure") || s == N_("Quit %1"))
+		return qt_(s);
+	else 
+		return QString();
+}
+
+
+void GuiApplication::addMenuTranslator()
+{
+	menu_trans_.reset(new MenuTranslator());
+	installTranslator(menu_trans_.get());
+}
+
+
 } // namespace frontend
 } // namespace lyx
 

src/frontends/qt4/GuiApplication.h

@@ -21,6 +21,8 @@
 
 #include "frontends/Application.h"
 
+#include <boost/scoped_ptr.hpp>
+
 #include <QApplication>
 #include <QTranslator>
 
@@ -32,6 +34,7 @@ class socket_callback;
 namespace frontend {
 
 class GuiWorkArea;
+class MenuTranslator;
 
 /// The Qt main application class
 /**
@@ -107,6 +110,11 @@ public:
 	bool x11EventFilter (XEvent * ev);
 #endif
 
+	/// A translator suitable for the entries in the LyX menu.
+	/// Only needed with Qt/Mac.
+	void addMenuTranslator();
+	///
+	boost::scoped_ptr<MenuTranslator> menu_trans_;
 }; // GuiApplication
 
 extern GuiApplication * guiApp;