We had to port code to Qt6, and one of the things that broke was the `QTableView’.

• In Qt 5,15 and earlier, applying a style sheet with custom checkbox indicators worked fine.
• In Qt 6.5.3, the custom image indicators overlapped over the default checkboxes and item text.
• In Qt 6.6.3 and 6.7.2, the custom image indicators show fine, the default indicators no longer show, but the indicators are still overlapping the text.

It is definitely an improvement – but I don’t know how to fix the overlapping of text, hidden under the indicator. The only options that are easy are also bad:

• adding lots of spaces (text wrapping would still be affected)
• inserting the checkbox as a separate column (I tried, but the header is formatted using QHeaderView::section:horizontal:first, QHeaderView::section:horizontal:only-one which I had trouble figuring out for the subsequent columns.

This is a super simple example showing the behavior, if somebody can help me until Qt fixes it completely. It behaves the same as the real program, the images cover the text.

main.cpp:

#include "mymodel.h"
#include <QApplication>
#include <QTableView>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTableView tableView;
    MyModel myModel;
    tableView.setModel(&myModel);

    QString viewStyle = "QTableView::item { padding: 10px; }n"
                        "QTableView::indicator { width: 30px; height: 30px; }n"
                        "QTableView::indicator:unchecked { image: url(:/checkbox_unselected.png); }n"
                        "QTableView::indicator:checked { image: url(:/checkbox_selected.png); } ";
    tableView.setStyleSheet(viewStyle);
    tableView.setColumnWidth(0, 100);
    tableView.setColumnWidth(1, 100);
    tableView.setColumnWidth(2, 100);
    tableView.setRowHeight(0, 100);
    tableView.setRowHeight(1, 100);

    tableView.show();
    return a.exec();
}

mymodel.h

#include <QAbstractTableModel>

class MyModel : public QAbstractTableModel
{
public:
    explicit MyModel(QObject *parent = nullptr);
    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
};

mymodel.cpp

#include "mymodel.h"

MyModel::MyModel(QObject *parent) : QAbstractTableModel(parent)  { }

int MyModel::rowCount(const QModelIndex & /*parent*/) const
{
    return 2;
}

int MyModel::columnCount(const QModelIndex & /*parent*/) const
{
    return 3;
}

QVariant MyModel::data(const QModelIndex &index, int role) const
{
    if (role == Qt::DisplayRole) {
        return QString("Row%1, Column%2").arg(index.row() + 1).arg(index.column() +1);
    }
    else if (role == Qt::CheckStateRole) {
        return (index.column() == 0) ? Qt::Checked : Qt::Unchecked;
    }
    return QVariant();
}