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Файл примера borderlayout.h
layouts/borderlayout/borderlayout.h

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 #ifndef BORDERLAYOUT_H
 #define BORDERLAYOUT_H

 #include <QLayout>
 #include <QRect>
 #include <QWidgetItem>

 class BorderLayout : public QLayout
 {
 public:
     enum Position { West, North, South, East, Center };

     BorderLayout(QWidget *parent, int margin = 0, int spacing = -1);
     BorderLayout(int spacing = -1);
     ~BorderLayout();

     void addItem(QLayoutItem *item);
     void addWidget(QWidget *widget, Position position);
     Qt::Orientations expandingDirections() const;
     bool hasHeightForWidth() const;
     int count() const;
     QLayoutItem *itemAt(int index) const;
     QSize minimumSize() const;
     void setGeometry(const QRect &rect);
     QSize sizeHint() const;
     QLayoutItem *takeAt(int index);

     void add(QLayoutItem *item, Position position);

 private:
     struct ItemWrapper
     {
         ItemWrapper(QLayoutItem *i, Position p) {
             item = i;
             position = p;
         }

         QLayoutItem *item;
         Position position;
     };

     enum SizeType { MinimumSize, SizeHint };
     QSize calculateSize(SizeType sizeType) const;

     QList<ItemWrapper *> list;
 };

 #endif