Different work-around for Qt < 5.5

src/Viewer/GraphicsWindowQt5.cpp

@@ -29,6 +29,7 @@
 #include <QAbstractEventDispatcher>
 #include <QOpenGLContext>
 #include <QSurfaceFormat>
+#include <QTimer>
 
 #include <Main/fg_props.hxx>
 
@@ -179,7 +180,7 @@ GLWindow::~GLWindow()
 void GLWindow::requestUpdate()
 {
     // mimic Qt 5.5's requestUpdate method
-    QTimer::singleShot(0, this, &QWindow::update);
+    QTimer::singleShot(0, this, &GLWindow::processUpdateEvent);
 }
 #endif
 
@@ -195,7 +196,20 @@ bool GLWindow::event( QEvent* event )
     }
     else if (event->type() == QEvent::UpdateRequest)
     {
-        qWarning() << "Got update request";
+        processUpdateEvent();
+    }
+    else if (event->type() == QEvent::Close) {
+        // spin an 'are you sure'? dialog here
+        // need to decide immediately unfortunately.
+        _gw->getEventQueue()->closeWindow();
+    }
+
+    // perform regular event handling
+    return QWindow::event( event );
+}
+
+void GLWindow::processUpdateEvent()
+{
     osg::ref_ptr<osgViewer::ViewerBase> v;
     if (_gw->_viewer.lock(v)) {
         v->frame();
@@ -206,15 +220,7 @@ bool GLWindow::event( QEvent* event )
     if (_gw->_continousUpdate) {
         requestUpdate();
     }
-    }
-    else if (event->type() == QEvent::Close) {
-        // spin an 'are you sure'? dialog here
-        // need to decide immediately unfortunately.
-        _gw->getEventQueue()->closeWindow();
-    }
 
-    // perform regular event handling
-    return QWindow::event( event );
 }
 
 void GLWindow::setKeyboardModifiers( QInputEvent* event )
@@ -730,7 +736,6 @@ void GraphicsWindowQt5::viewerChanged(osgViewer::ViewerBase*)
 void GraphicsWindowQt5::requestRedraw()
 {
   _window->requestUpdate();
-  GraphicsWindow::requestRedraw();
 }
 
 void GraphicsWindowQt5::requestContinuousUpdate(bool needed)

src/Viewer/GraphicsWindowQt5.hxx

@@ -82,6 +82,8 @@ signals:
 private slots:
     void onScreenChanged();
     
+    void processUpdateEvent();
+    
 protected:
     void syncGeometryWithOSG();