Allow columns with percentage width

src/blackgui/models/columns.cpp

@@ -185,6 +185,58 @@ namespace BlackGui
             return column >= 0 && column < m_columns.size();
         }
 
+        bool CColumns::hasAnyWidthPercentage() const
+        {
+            for (const CColumn &c : m_columns) { if (c.hasWidthPercentage()) { return true; }}
+            return false;
+        }
+
+        void CColumns::setWidthPercentages(const QList<int> percentages)
+        {
+            if (percentages.isEmpty())
+            {
+                for (CColumn &column : m_columns) { column.setWidthPercentage(-1); }
+                return;
+            }
+
+            int c = 0;
+            for (CColumn &column : m_columns)
+            {
+                column.setWidthPercentage(percentages.at(c++));
+            }
+        }
+
+        QList<int> CColumns::calculateWidths(int totalWidth) const
+        {
+            if (m_columns.isEmpty() || !this->hasAnyWidthPercentage()) { return {}; }
+
+            int totalPercentage = 0;
+            const int averagePercentage = 100 / m_columns.size();
+
+            for (const CColumn &c : m_columns)
+            {
+                totalPercentage += c.hasWidthPercentage() ? c.getWidthPercentage() : averagePercentage;
+            }
+
+            if (totalPercentage < 1) { return {}; }
+
+            // ideally totalPercentage would be 100%, but there is no guarantee
+            const double part = static_cast<double>(totalWidth) / totalPercentage;
+            QList<int> widths;
+
+            int usedWidth = 0;
+            for (const CColumn &c : m_columns)
+            {
+                const int percentage = c.hasWidthPercentage() ? c.getWidthPercentage() : averagePercentage;
+                const int restWidth = totalWidth - usedWidth;
+                const int width = qMin(restWidth, qRound(part * percentage));
+                widths.push_back(width);
+                usedWidth += width;
+            }
+
+            return widths;
+        }
+
         const CDefaultFormatter *CColumns::getFormatter(const QModelIndex &index) const
         {
             if (!isValidColumn(index)) { return nullptr; }

src/blackgui/models/columns.h

@@ -92,6 +92,15 @@ namespace BlackGui
             //! Translation context
             void setTranslationContext(const QString &translationContext) { m_translationContext = translationContext; }
 
+            //! Width in percentage
+            int getWidthPercentage() const { return m_widthPercentage; }
+
+            //! Having a width percentage
+            bool hasWidthPercentage() const { return m_widthPercentage > 0; }
+
+            //! Width percentage
+            void setWidthPercentage(int width) { m_widthPercentage = width; }
+
             //! Get a standard value object formatted column
             static CColumn standardValueObject(const QString &headerName, const BlackMisc::CPropertyIndex &propertyIndex, int alignment = CDefaultFormatter::alignDefault());
 
@@ -114,6 +123,7 @@ namespace BlackGui
             QString m_translationContext;
             QString m_columnName;
             QString m_columnToolTip;
+            int m_widthPercentage = -1;
             QSharedPointer<CDefaultFormatter> m_formatter; //!< Used formatter
             BlackMisc::CPropertyIndex m_propertyIndex;     //!< Property index for column
             BlackMisc::CPropertyIndex m_sortPropertyIndex; //!< Property index used when sorted (optional alternative)
@@ -202,6 +212,15 @@ namespace BlackGui
             //! Columns
             const QList<CColumn> &columns() const { return m_columns; }
 
+            //! Any column with width percentage?
+            bool hasAnyWidthPercentage() const;
+
+            //! Set the width percentages
+            void setWidthPercentages(const QList<int> percentages);
+
+            //! Calculate the absolute width
+            QList<int> calculateWidths(int totalWidth) const;
+
         private:
             QList<CColumn> m_columns;
             QString m_translationContext; //!< for future usage

src/blackgui/views/viewbase.cpp

@@ -545,6 +545,19 @@ namespace BlackGui
             tw->setTabText(index, o);
         }
 
+        template<class T>
+        void CViewBase<T>::setPercentageColumnWidths()
+        {
+            const int width = this->width() - 25; // avoid scrollbars etc, reserve a little space
+            QList<int> widths = this->getColumns().calculateWidths(width);
+            if (widths.isEmpty()) { return; }
+            for (int c = 0; c < this->getColumns().size(); c++)
+            {
+                const int w = widths.at(c);
+                this->setColumnWidth(c, w);
+            }
+        }
+
         template <class T>
         void CViewBase<T>::setSortIndicator()
         {

src/blackgui/views/viewbase.h

@@ -301,6 +301,9 @@ namespace BlackGui
             //! Workaround as of https://stackoverflow.com/q/3433664/356726
             void setForceColumnsToMaxSize(bool force) { m_forceColumnsToMaxSize = force; }
 
+            //! Resize mode
+            void setHorizontalHeaderSectionResizeMode(QHeaderView::ResizeMode mode);
+
             //! Index of the directory we "remember"
             void setSettingsDirectoryIndex(BlackMisc::CDirectories::ColumnIndex directoryIndex) { m_dirSettingsIndex = directoryIndex; }
 
@@ -744,6 +747,10 @@ namespace BlackGui
             //! Set a tab widget text based on row count, filter etc.
             void setTabWidgetViewText(QTabWidget *tw, int index);
 
+            //! Set the widths based on the column percentages
+            //! \sa CColumn::get
+            void setPercentageColumnWidths();
+
         protected:
             ModelClass *m_model = nullptr; //!< corresponding model
 

src/blackgui/views/viewbasenontemplate.cpp

@@ -39,8 +39,7 @@ namespace BlackGui
 {
     namespace Views
     {
-        CViewBaseNonTemplate::CViewBaseNonTemplate(QWidget *parent) :
+        CViewBaseNonTemplate::CViewBaseNonTemplate(QWidget *parent) : QTableView(parent)
-            QTableView(parent)
         {
             this->setContextMenuPolicy(Qt::CustomContextMenu);
             connect(this, &QWidget::customContextMenuRequested, this, &CViewBaseNonTemplate::customMenuRequested);
@@ -186,6 +185,11 @@ namespace BlackGui
             return this->ps_saveJson(selectedOnly, directory);
         }
 
+        void CViewBaseNonTemplate::setHorizontalHeaderSectionResizeMode(QHeaderView::ResizeMode mode)
+        {
+            this->horizontalHeader()->setSectionResizeMode(mode);
+        }
+
         IMenuDelegate *CViewBaseNonTemplate::setCustomMenu(IMenuDelegate *menu, bool nestPreviousMenu)
         {
             if (menu && nestPreviousMenu)