Moved mediaItem Delegate initialization to the mediaItem subclasses

That function requires access to variables that are initialized
in videoItem and audioItem constructors, so it can sometimes fail
when called from the superclass's constructor.
It might be an idea to avoid those calls altogether though

src/domain/UBGraphicsMediaItem.cpp

@@ -74,7 +74,6 @@ UBGraphicsMediaItem::UBGraphicsMediaItem(const QUrl& pMediaFileUrl, QGraphicsIte
     mMediaObject->setMedia(pMediaFileUrl);
 
     setDelegate(new UBGraphicsMediaItemDelegate(this));
-    Delegate()->createControls();
 
     setData(UBGraphicsItemData::itemLayerType, QVariant(itemLayerType::ObjectItem));
     setFlag(ItemIsMovable, true);
@@ -105,19 +104,24 @@ UBGraphicsMediaItem::UBGraphicsMediaItem(const QUrl& pMediaFileUrl, QGraphicsIte
 UBGraphicsAudioItem::UBGraphicsAudioItem(const QUrl &pMediaFileUrl, QGraphicsItem *parent)
     :UBGraphicsMediaItem(pMediaFileUrl, parent)
 {
+    haveLinkedImage = false;
+
     this->setSize(320, 26);
     this->setMinimumSize(QSize(150, 26));
 
+    Delegate()->createControls();
     Delegate()->frame()->setOperationMode(UBGraphicsDelegateFrame::ResizingHorizontally);
 
     mMediaObject->setNotifyInterval(1000);
-    haveLinkedImage = false;
 
 }
 
 UBGraphicsVideoItem::UBGraphicsVideoItem(const QUrl &pMediaFileUrl, QGraphicsItem *parent)
     :UBGraphicsMediaItem(pMediaFileUrl, parent)
 {
+    haveLinkedImage = true;
+    Delegate()->createControls();
+
     mVideoItem = new QGraphicsVideoItem(this);
 
     mVideoItem->setData(UBGraphicsItemData::ItemLayerType, UBItemLayerType::Object);
@@ -132,7 +136,6 @@ UBGraphicsVideoItem::UBGraphicsVideoItem(const QUrl &pMediaFileUrl, QGraphicsIte
     connect(mVideoItem, SIGNAL(nativeSizeChanged(QSizeF)),
             this, SLOT(videoSizeChanged(QSizeF)));
 
-    haveLinkedImage = true;
 
     setAcceptHoverEvents(true);