refs #674, code for hover/drop indicator

* item delegate for callback to view for hover
* proxy style for draw drop indicator as primitive
* added functions to view base for hover / callbacks
* highlight hover row in model

src/blackgui/views/viewbaseitemdelegate.h

@@ -0,0 +1,44 @@
+/* Copyright (C) 2016
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKGUI_VIEWBASE_ITEMDELEGATE_H
+#define BLACKGUI_VIEWBASE_ITEMDELEGATE_H
+
+#include <QStyledItemDelegate>
+
+namespace BlackGui
+{
+    namespace Views
+    {
+        class CViewBaseNonTemplate;
+
+        /*!
+         * Delegate for our view items
+         */
+        class CViewBaseItemDelegate : public QStyledItemDelegate
+        {
+        public:
+            //! Constructor
+            CViewBaseItemDelegate(QObject *parent = nullptr) : QStyledItemDelegate(parent) {}
+
+            //! \name QStyledItemDelegate overrides
+            //! @{
+            virtual void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+            virtual QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+            //! @}
+
+        private:
+            //! Related CViewBaseNonTemplate
+            CViewBaseNonTemplate *viewBase() const;
+        };
+    } // namespace
+} // namespace
+#endif // guard