Finally, animation works.

bcitemdelegate.h

@@ -4,11 +4,14 @@
 
 #include <QStyledItemDelegate>
 
+class QPropertyAnimation;
+class QVariantAnimation;
 class QListView;
 
 class BCItemDelegate : public QStyledItemDelegate
 {
   Q_OBJECT
+  Q_PROPERTY(qreal highlightOpacity READ highlightOpacity WRITE setHighlightOpacity)
 
 public:
 
@@ -25,17 +28,45 @@ public:
   QSize sizeHint(const QStyleOptionViewItem &option,const QModelIndex &index) const override;
   void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
 
+  qreal highlightOpacity() const
+  {
+    return _opacity;
+  }
+
+  void setHighlightOpacity(qreal opacity)
+  {
+    _opacity = opacity;
+    //qDebug() << " --- opa: " << opacity;
+    emit viewUpdateNeeded();
+  }
+
+  void clearAllHighlights();
+
 public slots:
 
   void onHighlightRow(int row);
 
+
+signals:
+
+  void viewUpdateNeeded();
+
 private:
 
+  void updateRow(int row);
   QString formatDisplayString(const QModelIndex &index) const;
 
   int _highlightedRow{-1};
-  QListView* _view{nullptr};
+  qreal _opacity{1.0};
+  QListView* _view{};
+  QPropertyAnimation *_animation{};
 
+private:
+
+
+
+  QHash<int, qreal> m_rowOpacities;
+  QHash<int, QVariantAnimation*> m_rowAnimations;
 };