View / model fixes / improvements

* allow upfront checking of formatter roles
* selection mode menus adjusted (data approach no longer worked with CSlot)
* removed unused style sheet parts
* minor View/Model tweaks/formatting

src/blackgui/models/columnformatters.cpp

@@ -93,17 +93,25 @@ namespace BlackGui
             return CVariant::fromValue(static_cast<int>(cs));
         }
 
+        bool CDefaultFormatter::supportsRole(int role) const
+        {
+            // generally supported?
+            if (role == Qt::TextAlignmentRole || role == Qt::UserRole) { return true; }
+
+            // specific?
+            return this->m_supportedRoles.contains(role);
+        }
+
         CVariant CDefaultFormatter::data(int role, const CVariant &inputData) const
         {
-            Qt::ItemDataRole roleEnum = static_cast<Qt::ItemDataRole>(role);
+            if (!this->supportsRole(role)) { return CVariant(); }
+            const Qt::ItemDataRole roleEnum = static_cast<Qt::ItemDataRole>(role);
 
             // always supported
             if (roleEnum == Qt::TextAlignmentRole) return { alignmentRole() };
 
             // check
             if (role == Qt::UserRole) { return CDefaultFormatter::displayRole(inputData); } // just as data provider
-            if (this->m_supportedRoles.isEmpty()) { return CVariant(); }
-            if (!this->m_supportedRoles.contains(role)) { return CVariant(); }
             switch (roleEnum)
             {
             case Qt::DisplayRole:

src/blackgui/models/columnformatters.h

@@ -73,6 +73,9 @@ namespace BlackGui
             //! Alignment available?
             virtual bool hasAlignment() const { return m_alignment >= 0; }
 
+            //! Is given role supported by formatter
+            bool supportsRole(int role) const;
+
             //! Receives CVariant of column data, and returns CVariant wrapping string, pixmap, or other values depending on role
             virtual BlackMisc::CVariant data(int role, const BlackMisc::CVariant &inputData) const;
 

src/blackgui/models/listmodelbase.cpp

@@ -225,6 +225,13 @@ namespace BlackGui
             connect(this, &CListModelBaseNonTemplate::dataChanged, this, &CListModelBaseNonTemplate::ps_onDataChanged);
         }
 
+        bool CListModelBaseNonTemplate::isHoveredRow(const QModelIndex &modelIndex) const
+        {
+            if (this->m_hoverRow < 0) { return false; }
+            if (!modelIndex.isValid()) { return false; }
+            return modelIndex.row() == this->m_hoverRow;
+        }
+
         template <typename ObjectType, typename ContainerType, bool UseCompare>
         CListModelBase<ObjectType, ContainerType, UseCompare>::CListModelBase(const QString &translationContext, QObject *parent)
             : CListModelBaseNonTemplate(translationContext, parent)
@@ -282,12 +289,26 @@ namespace BlackGui
         {
             // check / init
             if (!this->isValidIndex(index)) { return QVariant(); }
+
+            // Hover effect
+            if (role == Qt::BackgroundRole)
+            {
+                if (this->isHoveredRow(index))
+                {
+                    return QBrush(Qt::red);
+                }
+                return CListModelBaseNonTemplate::data(index, role);
+            }
+
+            // Formatter
             const CDefaultFormatter *formatter = this->m_columns.getFormatter(index);
             Q_ASSERT_X(formatter, Q_FUNC_INFO, "Missing formatter");
-            if (!formatter) { return QVariant(); }
 
-            //! Formatted data
-            ObjectType obj = this->containerOrFilteredContainer()[index.row()];
+            // Upfront checking avoids unnecessary data fetching
+            if (!formatter || !formatter->supportsRole(role)) { return CListModelBaseNonTemplate::data(index, role); }
+
+            // Formatted data
+            const ObjectType obj = this->containerOrFilteredContainer()[index.row()];
             BlackMisc::CPropertyIndex propertyIndex = this->columnToPropertyIndex(index.column());
             return formatter->data(role, obj.propertyByIndex(propertyIndex)).getQVariant();
         }
@@ -296,26 +317,14 @@ namespace BlackGui
         bool CListModelBase<ObjectType, ContainerType, UseCompare>::setData(const QModelIndex &index, const QVariant &value, int role)
         {
             Qt::ItemDataRole dataRole = static_cast<Qt::ItemDataRole>(role);
-            if (!(dataRole == Qt::UserRole || dataRole == Qt::EditRole))
-            {
-                return false;
-            }
+            if (!(dataRole == Qt::UserRole || dataRole == Qt::EditRole)) { return false; }
 
             // check / init
-            if (!this->isValidIndex(index))
-            {
-                return false;
-            }
-            if (!this->m_columns.isEditable(index))
-            {
-                return false;
-            }
+            if (!this->isValidIndex(index)) { return false; }
+            if (!this->m_columns.isEditable(index)) { return false; }
             const CDefaultFormatter *formatter = this->m_columns.getFormatter(index);
             Q_ASSERT(formatter);
-            if (!formatter)
-            {
-                return false;
-            }
+            if (!formatter) { return false; }
 
             ObjectType obj = this->m_container[index.row()];
             ObjectType currentObject(obj);

src/blackgui/models/listmodelbase.h

@@ -161,11 +161,15 @@ namespace BlackGui
             //! Helper method with template free signature
             virtual int performUpdateContainer(const BlackMisc::CVariant &variant, bool sort) = 0;
 
-            CColumns        m_columns;                            //!< columns metadata
-            int             m_sortedColumn;                       //!< current sort column
-            bool            m_modelDestroyed = false;             //!< model is about to be destroyed
-            Qt::SortOrder   m_sortOrder;                          //!< sort order (asc/desc)
-            Qt::DropActions m_dropActions    = Qt::IgnoreAction;  //!< drop actions
+            //! Row to be hovered?
+            bool isHoveredRow(const QModelIndex &modelIndex) const;
+
+            CColumns        m_columns;                         //!< columns metadata
+            int             m_hoverRow = -1;                   //!< hovered row number
+            int             m_sortedColumn;                    //!< currently sorted column
+            bool            m_modelDestroyed = false;          //!< model is about to be destroyed
+            Qt::SortOrder   m_sortOrder;                       //!< sort order (asc/desc)
+            Qt::DropActions m_dropActions = Qt::IgnoreAction;  //!< drop actions
 
         private:
             BlackMisc::CDigestSignal m_dsModelsChanged { this, &CListModelBaseNonTemplate::changed, &CListModelBaseNonTemplate::ps_onChangedDigest, 500, 10 };

src/blackgui/models/listmodeldbobjects.cpp

@@ -40,7 +40,7 @@ namespace BlackGui
             if (isHighlightIndex(index)) { return QBrush(m_highlightColor); }
             if (!highlightDbData()) { return CListModelBase<ObjectType, ContainerType, UseCompare>::data(index, role); }
 
-            ObjectType obj(this->at(index));
+            const ObjectType obj(this->at(index));
             // highlight DB models
             if (obj.hasValidDbKey())
             {