gr-fosphor: Export method to retrieve the underying QWidget

This is to allow usage in pure c++ flow graph

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

include/gnuradio/fosphor/qt_sink_c.h

@@ -52,6 +52,9 @@ namespace gr {
        */
       static sptr make(QWidget *parent=NULL);
 
+      virtual void exec_() = 0;
+      virtual QWidget* qwidget() = 0;
+
 #if defined(PY_VERSION) || defined(SWIGPYTHON)
       virtual PyObject* pyqwidget() = 0;
 #else

lib/qt_sink_c_impl.cc

@@ -93,6 +93,19 @@ qt_sink_c_impl::glctx_update()
 }
 
 
+void
+qt_sink_c_impl::exec_()
+{
+	d_qApplication->exec();
+}
+
+QWidget*
+qt_sink_c_impl::qwidget()
+{
+	return dynamic_cast<QWidget*>(this->d_gui);
+}
+
+
 #ifdef ENABLE_PYTHON
 PyObject*
 qt_sink_c_impl::pyqwidget()

lib/qt_sink_c_impl.h

@@ -53,6 +53,9 @@ namespace gr {
      public:
       qt_sink_c_impl(QWidget *parent=NULL);
 
+      void exec_();
+      QWidget* qwidget();
+
 #if defined(PY_VERSION) || defined(SWIGPYTHON)
       PyObject* pyqwidget();
 #else