Show gridLine only for columns in QTableView - c++

Question

In a QTableView, irrespective if there are entries or not. I want to show grid to it (considering its fixed size QTableView), but only for columns, not for rows.

Answer 1

You have to overwrite the paintEvent() method, in addition to setting the setShowGrid() to false.
#include <QApplication>
#include <QPainter>
#include <QStandardItemModel>
#include <QTableView>
#include <QHeaderView>
#include <QPaintEvent>
class TableView: public QTableView{
public:
using QTableView::QTableView;
protected:
void paintEvent(QPaintEvent *event){
QTableView::paintEvent(event);
if (horizontalHeader()->count() == 0 || verticalHeader()->count() == 0)
return;
QPainter painter(viewport());
QStyleOptionViewItem option;
option.init(this);
const int gridHint = style()->styleHint(QStyle::SH_Table_GridLineColor, &option, this);
const QColor gridColor = static_cast<QRgb>(gridHint);
const QPen gridPen = QPen(gridColor, 0, gridStyle());
painter.setPen(gridPen);
int w = horizontalHeader()->offset();
for(int i=0; i<horizontalHeader()->count(); ++i){
w += horizontalHeader()->sectionSize(i);
painter.drawLine(w-1, 0, w-1,viewport()->height());
}
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
TableView view;
QStandardItemModel model(5, 5);
for(int i=0; i< model.rowCount(); ++i)
for(int j=0; j < model.columnCount(); ++j)
model.setItem(i, j, new QStandardItem(QString("%1-%2").arg(i).arg(j)));
view.setModel(&model);
view.setShowGrid(false);
view.show();
return a.exec();
}