How to reset tab order in QHeaderView?

[deleted385]

Right now the only way to go to the next QlineEdit in the header is click. If I press tab on any of these QLineEdit, it goes to the cell of QTableView like this:

Here's how I've added those QLineEdit in the header:

void TableHeader::resetBoxes(int count){
    if(lineEdits.size()) {
        foreach(auto line, lineEdits) line->disconnect();
        qDeleteAll(lineEdits);
        lineEdits.clear();
        queries.clear();
    }
    for (int i = 0; i < count; i++) {
        auto edit = new QLineEdit(this);
        lineEdits.append(edit);
        queries.append("");
        connect(edit, &QLineEdit::textChanged, this, &TableHeader::textChanged);
        edit->show();      
    }
}

How to change this behavior? A side qustion, right now I've a QSortFilterProxyModel named TableProxyModel and in it, I've this:

bool TableProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) const{
    bool match = true;
    for (int i = 0; i < sourceModel()->columnCount(); i++) {
        if(queries[i] != ""){
            if(sourceModel()->data(sourceModel()->index(row, i)).toString().contains(queries.at(i)))
                continue;
            match = false;
            break;
        }
    }
    return match;
}

so here I'm checking every columns of that row. Can I give it, or some other Model/ProxyModel, an expression like:

Col1 = 10 AND Col2 >= 20 AND Col3 = someString AND col4 LIKE someOtherString

for accepting/rejecting rows? Something like the DataView RowFilter expression of .net.

[SGaist]

Then maybe an event filter.

[SGaist]

Hi,

setTabOrder comes to mind for that.

As for your complex expression, it's up to you to build a parser for it.

If it's a simple "and" statement, you could build a hash with a vector of column and the value that should be checked. And then use that hash to inspect all the elements that forms the expression.

[deleted385]

@SGaist, tried if(i > 0) setTabOrder(lineEdits[i - 1], edit); and if(i > 0) QWidget::setTabOrder(lineEdits[i - 1], edit); in the for loop where I add those QLineEdit with and without table->setFocusPolicy(Qt::ClickFocus);. Doesn't work.

EDIT
Also tried setFocusPolicy(Qt::TabFocus); in the constructor of TableHeader.

[SGaist]

Then maybe an event filter.

[deleted385]

@SGaist, not sure whether I've implemented in correct way in right place. Here's what I've in the subclass of QHeaderView:

bool TableHeader::eventFilter(QObject *o, QEvent *e){
    for (int i = 0; i < lineEdits.size(); i++) {
        qDebug() << "here";
        if(lineEdits[i] != o) continue;
        if(e->type() != QEvent::KeyPress) return false;
        auto event = static_cast<QKeyEvent*>(e);
        if(event->key() != Qt::Key_Tab) return false;
        if(i == lineEdits.size()) lineEdits[0]->setFocus(Qt::FocusReason::OtherFocusReason);
        else lineEdits[i + 1]->setFocus(Qt::FocusReason::OtherFocusReason);
        return true;
    }
    return QHeaderView::eventFilter(o, e);
}

I don't see it printing here in Qt Creator's output window. One more thing, when I don't have any table cell visible, TAB works automatically BUT if I have any table cell visible, it doesn't work:

[SGaist]

You did you install the filter ?

[deleted385]

@SGaist, missed that, now it works. Thanks. Two more question:

1. do I have to uninstall the filter when I remove some of those line edits?
2. do I have to call line->disconnect() as I remove and delete line edit or it'll be automatically disconnected when I delete?

[SGaist]

1. do you mean delete ? Then no
2. nothing particular to do.

[deleted385]

@SGaist, yes with the keyword delete line or line.deleteLater().

[SGaist]

So the answer is no.

[deleted385]

@SGaist, QSqlTableModel actually has that feature and I can give it an expression like that in its setFilter to accept/reject rows like this:

Here's the code I used for that:

void TableWidget::refreshModel(){
    auto queries = tableHeader->getQueries();
    QString expression;
    for (int i = 0; i < queries.size(); i++) {
        if(queries[i] == "") continue;
        auto column = tableModel->headerData(i, Qt::Horizontal).toString() + " " + queries[i] + " AND ";
        expression += column;
    }
    tableModel->setFilter(expression.left(expression.length() - 5)); // -5 to remove last " AND "
    if(tableModel->lastError().type() != QSqlError::NoError){
        tableModel->setFilter(""); // do someting else here if you want
        tableModel->select();
    }
    while (tableModel->canFetchMore()) tableModel->fetchMore();
    countLable->setText(QString::number(tableModel->rowCount()));
}

[SGaist]

Is it just informational or is there a question related ?

[deleted385]

@SGaist, Informational