When the workflow is beeing rendered as a preview, the slider moves accordingly

src/Workflow/MainWorkflow.cpp

@@ -54,6 +54,7 @@ unsigned char*    MainWorkflow::getOutput()
     unsigned char* ret = m_tracks[0]->getOutput( m_currentFrame );
     ++m_currentFrame;
     emit frameChanged( m_currentFrame );
+    emit positionChanged( (float)m_currentFrame / (float)m_length );
     return ret;
 }
 
@@ -64,6 +65,7 @@ void        MainWorkflow::setPosition( float pos )
     m_tracks[0]->setPosition( pos );
     m_currentFrame = frame;
     emit frameChanged( frame );
+    //Do not emit a signal for the RenderWidget, since it's the one that triggered that call...
 }
 
 qint64      MainWorkflow::getLength() const

src/Workflow/MainWorkflow.h

@@ -61,7 +61,14 @@ class   MainWorkflow : public QObject
         qint64                  m_length;
 
     signals:
+        /**
+         *  \brief Used to notify a change to the timeline cursor
+         */
         void                    frameChanged( qint64 currentFrame );
+        /**
+          * \brief Used to nofify a change to the PreviewWidget
+          */
+        void                    positionChanged( float pos );
 };
 
 #endif // MAINWORKFLOW_H

src/gui/RenderPreviewWidget.cpp

@@ -50,6 +50,7 @@ RenderPreviewWidget::RenderPreviewWidget( MainWorkflow* mainWorkflow, QWidget* r
 
     connect( m_mediaPlayer, SIGNAL( playing() ), this, SLOT( __videoPlaying() ) );
     connect( m_mediaPlayer, SIGNAL( paused() ), this, SLOT( __videoPaused() ) );
+    connect( m_mainWorkflow, SIGNAL( positionChanged( float ) ), this, SLOT( __positionChanged( float ) ) );
 }
 
 
@@ -114,7 +115,12 @@ void        RenderPreviewWidget::__endReached()
 
 void        RenderPreviewWidget::__positionChanged()
 {
-    qDebug() << "RenderPreviewWidget::__positionChanged: Unimplemented";
+    qFatal("This should never be used ! Get out of here !");
+}
+
+void        RenderPreviewWidget::__positionChanged( float pos )
+{
+    emit positionChanged( pos );
 }
 
 void        RenderPreviewWidget::__videoPaused()

src/gui/RenderPreviewWidget.h

@@ -60,6 +60,7 @@ class   RenderPreviewWidget : public GenericPreviewWidget
 
 public slots:
     void                    __positionChanged();
+    void                    __positionChanged( float pos );
     void                    __videoPaused();
     void                    __videoPlaying();
     void                    __endReached();