Qt checkbox this combobox?

Question

Qt

I want to make a drop-down list with a CheckBox, so that when a ChexkBox is selected, it will be displayed in the ComboBox itself? an example is the "Question tags" field on the page https://toster.ru/question/new
I create a ComboBox with ChexkBox like this

QStandardItemModel *model = new QStandardItemModel();
    for(int i=0;i<50;i++)
    {
        QStandardItem* item = new QStandardItem(QString::number(i));

        item->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
        item->setData(Qt::Unchecked, Qt::CheckStateRole);
        model->setItem(i, 0, item);

    }
    ui->comboBox->setModel(model);

How now to intercept the click on the ChexkBox and display the list separated by commas in the ComboBox?
connect(?, ?, this, &form::onSetActivated);

Answer 1

I don't see a way through signals-slots.
Inherit from QStandardItemModel, stick on setModelData.
Better yet, inherit from QAbstractTableModel and override all these data(), flags()…

Answer 2

See how it's done here
https://habr.com/ru/post/215289/