QML how to call Shift+Tab behavior without using keyboard?

[Kuba-dev]

I have an embedded linux device with only 5 keys mapped in system as keyboard emiting keyboard events:
1 - TAB
2 - SPACE
3 - UP
4 - DOWN
5 - ESC
It is enough to edit parameters - many SpinBoxes with focus change with TAB. But the client wants to have an option to focus back just like on desktop by pressing Shift + Tab, but by pressing SPACE on Spinbox
How to do that in QML?

Got something like:

    function navBack(repeater,model)
    {
        let prevItem = repeater.itemAt(model.index-1)
        if(prevItem)
            prevItem.forceActiveFocus()
    }

               SpinBox {
                    Keys.onSpacePressed: {
                        navBack(repeater,model);
                        event.accepted = true
                    }

And it works inside repeater, but I am unable to focus Back previous editable element like by pressing Shift+TAB
Which function is called on Shift+TAB key combination? And how to call it?

[GrecKo]

Item has a nextItemInFocusChain(bool forward = true) function.

You could do

Keys.onSpacePressed: event => {
    const previousItem = nextItemInFocusChain(false);
    if (previousItem)
        previousItem.forceActiveFocus();
    event.accepted = true;
}

EDIT: that could also be done at the window level with a shortcut or an event filter to not have to modify each item.

[Kuba-dev]

It worked perfectly! Thank you