QTabelView with Arabic-Indic numerals for the vertical header

CroCo

I'm working on a project that requires arabic-indic numerals for numbering the vertical header. I've managed to set them manually as follows:

m_model = new QStandardItemModel(this);
m_model = new QStandardItemModel(15,3,this);
m_model->setHorizontalHeaderItem(0, new QStandardItem(QString("الاول")));
m_model->setHorizontalHeaderItem(1, new QStandardItem(QString("الثاني")));
m_model->setHorizontalHeaderItem(2, new QStandardItem(QString("الثالث")));
QStringList vertHeaders;
vertHeaders << "١" << "٢" << "٣";
m_model->setVerticalHeaderLabels( vertHeaders );
ui->tableView->setModel(m_model);
ui->tableView->setLayoutDirection(Qt::RightToLeft);
ui->tableView->verticalHeader()->setDefaultAlignment(Qt::AlignCenter);

With the following output:

How to configure it and use Arabic-Indic as a default numbering system?

VRonin

I would go as far as to say this is a Qt Bug.
The problem is https://code.woboq.org/qt5/qtbase/src/widgets/itemviews/qheaderview.cpp.html#2765 is using QVariant::toString instead of QLocale::toString

You'd need to subclass QHeaderView and reimplement void paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const copy paste basically everything, wiggle out of using private stuff and replace opt.text = d->model->headerData(logicalIndex, d->orientation, Qt::DisplayRole).toString(); with:

const QVaraiant textData = model()->headerData(logicalIndex, orientation(),Qt::DisplayRole);
switch(textData.type()){
case QMetaType::Int:
 opt.text = locale().toString(textData.toInt());
break;
// other cases for double/float, unsigned int and other signed/unsigned things (short, long long, etc), and dates/times
default:
 opt.text = textData.toString();
}

CroCo

@VRonin Thank you for the answer. Would you please elaborate how can I subclass QHeaderView and how to pass the customized class to TableView. Thank you.

SGaist

Hi,

QTableView::setVerticalHeader.

class LocalizedHeaderView : public QHeaderView
{
protected:
    void paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const
    {
        // The code
        const QVariant textData = model()->headerData(logicalIndex, orientation(),Qt::DisplayRole);
        switch (textData.type()) {
            case QMetaType::Int:
            opt.text = locale().toString(textData.toInt());
            break;
            // other cases for double/float, unsigned int and other signed/unsigned things (short, long long, etc), and dates/times
        default:
            opt.text = textData.toString();
        }
        // Rest of the code
    }
};

CroCo

@SGaist
I got this error

error: 'd_func' is a private member of 'QHeaderView'
        Q_D(const QHeaderView);

CroCo

@VRonin said in QTabelView with Arabic-Indic numerals for the vertical header:

wiggle out

How do I avoid private members?

SGaist

Just thought of a possibly simpler way: why not subclass the headerData method and fix there the returned value ?

CroCo

@SGaist could you please elaborate a bit?

mrjj

@CroCo
Hi
headerdata is a virtual function in the model
http://doc.qt.io/qt-5/qabstractitemmodel.html#headerData
It returns the data used in headers for any HedaderView attached.