QLayout Class Reference
[QtGui module]

QLayoutItem * QLayout::itemAt ( int index ) const   [pure virtual]

Must be implemented in subclasses to return the layout item at index. If there is no such item, the function must return 0. Items are numbered consecutively from 0. If an item is deleted, other items will be renumbered.

This function can be used to iterate over a layout. The following code will draw a rectangle for each layout item in the layout structure of the widget.

 static void paintLayout(QPainter *painter, QLayoutItem *item)
 {
     QLayout *layout = item->layout();
     if (layout) {
         for (int i = 0; i < layout->count(); ++i)
             paintLayout(painter, layout->itemAt(i));
     }
     painter->drawRect(item->geometry());
 }

 void MyWidget::paintEvent(QPaintEvent *)
 {
     QPainter painter(this);
     if (layout())
         paintLayout(&painter, layout());
 }

See also count() and takeAt().

 QLayoutItem *child;
 while ((child = layout->takeAt(0)) != 0) {
     ...
     delete child;
 }