QTableView navigation with TAB

[Julieng]

Hello, when hitting TAB key in a QTableView, cursor goes toward right side. I would like the cursor to move down instead of right. I tried to build a code which works not so bad but when I have cells which are spanned, cursor disappears. Do you have an idea to improve this behavior ? Thanks in advance !

void customTableView::searchNextIndex() {
    int row = currentIndex().row();
    int col = currentIndex().column();
    // Following cell
    row++;
    if(row>=model()->rowCount()) {
        row = 0;
        col++;
    }
    if(col>=model()->columnCount()) {
        col = 0;
    }
    // Loop while following cell is not selectable (or a complete loop has been done)
    unsigned int counter = 0;
    unsigned int maxCounter = model()->rowCount()*model()->columnCount()-1;
    Qt::ItemFlags currentFlag = model()->flags(model()->index(row, col));
    while(counter<maxCounter && !currentFlag.testFlag(Qt::ItemIsSelectable)) {
        row++;
        if(row>=model()->rowCount()) {
            row = 0;
            col++;
        }
        if(col>=model()->columnCount()) {
            col = 0;
        }
        currentFlag = model()->flags(model()->index(row, col));
        counter++;
    }
    setCurrentIndex(model()->index(row, col));
    scrollTo(model()->index(row, col));
}

[VRonin]

class CustomTableView : public QTableView{
    Q_OBJECT
    Q_DISABLE_COPY(CustomTableView)
public:
    explicit CustomTableView(QWidget *parent = Q_NULLPTR)
        :QTableView(parent)
    {}
protected:
    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE
    {
        if(event->key() == Qt::Key_Tab || event->key() == Qt::Key_Backtab){
            QKeyEvent newEvent(event->type(), event->key() == Qt::Key_Tab ? Qt::Key_Down : Qt::Key_Up, event->modifiers(), event->nativeScanCode(), event->nativeModifiers(), event->text(), event->isAutoRepeat(), event->count());
            event->accept();
            QTableView::keyPressEvent(&newEvent);
            return;
        }
        QTableView::keyPressEvent(event);
    }
};

[Julieng]

Thanks vRonin, this is a smart and efficient way to do it. The only missing part is that when I am at the end (last row) of the table, I would like to go back to the first line in the following column.

For example, let's consider (x = borders) :
xxxxxxxxxxxxxxxxxxxxxxx
x............................................x
xxxxxxxxxxxxxxxxxxxxxxx
x............x.................x...........x
xxxxxxxxxxxxxxxxxxxxxxx

I would like to highlight col 0, row 0 => TAB => col 0, row 1 => TAB => col 1, row 0 but since spanned, corresponding to range col 0, row 0 to col 1, row 0 => TAB => col 1, row 1 => TAB => col 2, row 0 to col 2, row 0 (spanned cell) => TAB => col2, row 1 => col 0, row 0...

I have tested something like :

void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE
    {
        else if(event->key()==Qt::Key_Tab) {
            if(currentIndex().row()>=model()->rowCount()-1) {
                if(currentIndex().column()>=model()->columnCount()-1) {
                    setCurrentIndex(model()->index(0, 0));
                }
                else {
                    QKeyEvent newEvent(event->type(), Qt::Key_Right, event->modifiers(), event->nativeScanCode(), event->nativeVirtualKey(), event->nativeModifiers(), event->text(), event->isAutoRepeat(), event->count());
                    event->accept();
                    QTableView::keyPressEvent(&newEvent);
                    setCurrentIndex(model()->index(0, currentIndex().column()));
                }
            }
            else {
                QKeyEvent newEvent(event->type(), Qt::Key_Down, event->modifiers(), event->nativeScanCode(), event->nativeVirtualKey(), event->nativeModifiers(), event->text(), event->isAutoRepeat(), event->count());
                event->accept();
                QTableView::keyPressEvent(&newEvent);
            }
            return;
        }
        QTableView::keyPressEvent(event);
    }

That's not as clean as your code. I would appreciate if you have suggestions to obtain a better code.