Getting Parent Layout in Qt

(Updated answer)

I guess it is not easily possible then. Since a Widget can be technically contained in multiple layouts (a horizontal layout which is aligned inside a vertical layout, for instance).

Just remember that a QWidget's parent does not change if it is aligned in a layout.

You possibly have to keep track of that yourself, then.

SOLVED! Usage: QLayout* parentLayout = findParentLayout(addedWidget)

QLayout* findParentLayout(QWidget* w, QLayout* topLevelLayout)
{
  for (QObject* qo: topLevelLayout->children())
  {
     QLayout* layout = qobject_cast<QLayout*>(qo);
     if (layout != nullptr)
     {
        if (layout->indexOf(w) > -1)
          return layout;
        else if (!layout->children().isEmpty())
        {
          layout = findParentLayout(w, layout);
          if (layout != nullptr)
            return layout;
        }
     }
  }
  return nullptr;
}

QLayout* findParentLayout(QWidget* w)
{
    if (w->parentWidget() != nullptr)
        if (w->parentWidget()->layout() != nullptr)
            return findParentLayout(w, w->parentWidget()->layout());
    return nullptr;
}

Simply use:

QHBoxLayout* parentLayout = button->parentWidget()->layout();

I assume button is a child of the widget which contains the layout which contains button. button->parentWidget() returns a pointer to the widget of the button's parent and ->layout() returns the pointer to the layout of the parent.

use widget.parent().layout() and search brute force (recursion included) is my only advice. Maybe you can search be "name".