QTreeWidgetItem with two parents

manpreet Best Answer 2 years ago

Can I somehow attach one QTreeWidgetItem to two (or more) nodes at once? Just like this:

parent1
 └child1
parent2
 └child1

If I just do addChild() on both parents, the child appears only on the first parent. Is that even possible? Or such result can be achieved only by completely copying of descendant?

manpreet 2 years ago

The instructions say:

If the child has already been inserted somewhere else it won't be inserted again.

This means that only option is to copy the child completely. Roughly so:

QTreeWidgetItem* copy(QTreeWidgetItem* item)
{
    if (item == nullptr)
    {
        return nullptr;
    }

    QTreeWidgetItem* out = new QTreeWidgetItem(*item);
    for (int i = 0; i < item->childCount(); i++)
    {
        out->addChild(copy(item->child(i)));
    }

    return out;
}