at qt4 termination, ensure quit() function is executed in the right thread

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

modules/gui/qt4/Modules.am

@@ -57,6 +57,7 @@ nodist_SOURCES_qt4 = \
 		components/sout/sout_widgets.moc.cpp \
 		util/input_slider.moc.cpp \
 		util/customwidgets.moc.cpp \
+		util/qvlcapp.moc.cpp \
 		resources.cpp \
 		ui/equalizer.h \
 		ui/v4l2.h \

modules/gui/qt4/qt4.cpp

@@ -329,7 +329,7 @@ static void Close( vlc_object_t *p_this )
     intf_sys_t *p_sys = p_intf->p_sys;
 
     var_Destroy (p_this->p_libvlc, "qt4-iface");
-    QApplication::quit();
+    QVLCApp::triggerQuit();
 
     vlc_join (p_sys->thread, NULL);
 #ifdef Q_WS_X11

modules/gui/qt4/qt4.hpp

@@ -52,7 +52,7 @@ enum {
     MsgEventType    = 300,
 };
 
-class QApplication;
+class QVLCApp;
 class QMenu;
 class MainInterface;
 class QSettings;
@@ -61,7 +61,7 @@ struct intf_sys_t
 {
     vlc_thread_t thread;
 
-    QApplication *p_app;     /* Main Qt Application */
+    QVLCApp *p_app;          /* Main Qt Application */
     MainInterface *p_mi;     /* Main Interface, NULL if DialogProvider Mode */
 
     QSettings *mainSettings; /* Qt State settings not messing main VLC ones */

modules/gui/qt4/util/qvlcapp.hpp

@@ -30,13 +30,26 @@
 
 class QVLCApp : public QApplication
 {
+    Q_OBJECT
+
 public:
-    QVLCApp( int & argc, char ** argv ) : QApplication( argc, argv, true ) { }
+    QVLCApp( int & argc, char ** argv ) : QApplication( argc, argv, true )
+    {
+        connect( this, SIGNAL(quitSignal()), this, SLOT(quit()) );
+    }
+
+    static void triggerQuit()
+    {
+         QVLCApp *app = qobject_cast<QVLCApp*>( instance() );
+         if ( app )
+             emit app->quitSignal();
+    }
 
 #if defined (Q_WS_X11)
      QVLCApp( Display *dp, int & argc, char ** argv )
          : QApplication( dp, argc, argv )
      {
+        connect( this, SIGNAL(quitSignal()), this, SLOT(quit()) );
      }
 #endif
 
@@ -54,6 +67,11 @@ protected:
         return false;
     }
 #endif
+
+
+signals:
+    void quitSignal();
+
 };
 
 #endif