Объединенные ячейки списка

InstructorsAndTrainees/tasks/customdelegate.cpp

@@ -0,0 +1,41 @@
+#include "customdelegate.h"
+
+CustomDelegate::CustomDelegate(QObject *parent):
+    QItemDelegate(parent)
+{
+
+}
+
+void CustomDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    bool mergeCell = index.data(UserRole_MergeCell).toBool();
+
+    if (mergeCell && index.column() == 0)
+    {
+        QModelIndex nextColumnIndex = index.siblingAtColumn(index.column() + 1);
+        if (!nextColumnIndex.isValid())
+        {
+            QItemDelegate::paint(painter, option, index);
+            return;
+        }
+
+        QRect mergedRect(option.rect.x(),
+                         option.rect.y(),
+                         option.rect.width() * 2,
+                         option.rect.height());
+
+        painter->save();
+        painter->setClipRect(mergedRect);
+        drawBackground(painter, option, index);
+        drawDisplay(painter, option, mergedRect, index.data(Qt::DisplayRole).toString());
+
+        painter->restore();
+    } else {
+        QItemDelegate::paint(painter, option, index);
+    }
+}
+
+QSize CustomDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    return QItemDelegate::sizeHint(option, index);
+}