TracksView is now a singleton

src/gui/Timeline.cpp

@@ -39,7 +39,7 @@ Timeline::Timeline( QWidget *parent ) :
     m_mainWorkflow = new MainWorkflow( MAX_TRACKS );
 
     m_tracksScene = new TracksScene( this );
-    m_tracksView = new TracksView( m_tracksScene, m_mainWorkflow, m_ui.tracksFrame );
+    m_tracksView = TracksView::instance( m_tracksScene, m_mainWorkflow, m_ui.tracksFrame );
     m_tracksView->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
     m_tracksView->scale(1, 1);
     m_tracksView->setAlignment( Qt::AlignLeft | Qt::AlignTop );

src/gui/TracksView.cpp

@@ -35,9 +35,26 @@
 #include "GraphicsCursorItem.h"
 #include "Commands.hpp"
 
+TracksView* TracksView::m_instance = NULL;
+
+TracksView* TracksView::instance( QGraphicsScene* scene, MainWorkflow* mainWorkflow, QWidget* parent )
+{
+    if ( m_instance ) return m_instance;
+    m_instance = new TracksView( scene, mainWorkflow, parent );
+    return m_instance;
+}
+
+TracksView* TracksView::instance()
+{
+    Q_ASSERT( m_instance );
+    return m_instance;
+}
+
 TracksView::TracksView( QGraphicsScene* scene, MainWorkflow* mainWorkflow, QWidget* parent )
         : QGraphicsView( scene, parent ), m_scene( scene ), m_mainWorkflow( mainWorkflow )
 {
+    connect( qApp, SIGNAL( aboutToQuit() ), this, SLOT( deleteLater() ) );
+
     //TODO should be defined by the settings
     m_tracksHeight = 25;
 

src/gui/TracksView.h

@@ -81,7 +81,8 @@ class TracksView : public QGraphicsView
     Q_OBJECT
 
 public:
-    TracksView( QGraphicsScene* scene, MainWorkflow* mainWorkflow, QWidget* parent = 0 );
+    static TracksView* instance( QGraphicsScene* scene, MainWorkflow* mainWorkflow, QWidget* parent = 0 );
+    static TracksView* instance();
     void setDuration( int duration );
     int duration() const { return m_projectDuration; }
     int tracksHeight() const { return m_tracksHeight; }
@@ -112,11 +113,14 @@ private slots:
     void                    updateDuration();
 
 private:
+    TracksView( QGraphicsScene* scene, MainWorkflow* mainWorkflow, QWidget* parent = 0 );
+    virtual ~TracksView() { }
     void                    createLayout();
     void                    addVideoTrack();
     void                    addAudioTrack();
     void                    moveMediaItem( AbstractGraphicsMediaItem* item, QPoint position );
     void                    moveMediaItem( AbstractGraphicsMediaItem* item, int track, int time );
+    static TracksView*      m_instance;
     QGraphicsScene*         m_scene;
     int                     m_tracksHeight;
     unsigned int            m_tracksCount;