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/viewbaseproxystyle.cpp

@@ -0,0 +1,38 @@
+/* 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.
+ */
+
+#include "viewbaseproxystyle.h"
+#include "viewbase.h"
+
+namespace BlackGui
+{
+    namespace Views
+    {
+        CViewBaseProxyStyle::CViewBaseProxyStyle(CViewBaseNonTemplate *view, QStyle *style) : QProxyStyle(style), m_view(view) {}
+
+        void CViewBaseProxyStyle::drawPrimitive(QStyle::PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
+        {
+            const bool indicator = (element == QStyle::PE_IndicatorItemViewItemDrop);
+            if (indicator)
+            {
+                Q_UNUSED(painter);
+                Q_UNUSED(option);
+                Q_UNUSED(widget);
+                QPainter viewPainter(this->m_view->viewport());
+                QPoint point = this->m_view->mapFromGlobal(QCursor::pos());
+                if (!point.isNull())
+                {
+                    const QPoint topLeft(0, point.y());
+                    const QPoint topRight(this->m_view->width(), point.y());
+                    viewPainter.drawLine(topLeft, topRight);
+                }
+            }
+        }
+    } // namespace
+} // namespace