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#include <QGraphicsWidget>

#include <QGraphicsProxyWidget>

#include <QGraphicsAnchorLayout>

#include <QtGui>

static QGraphicsProxyWidget *createItem(const QSizeF &minimum = QSizeF(100.0, 100.0),

                                   const QSizeF &preferred = QSize(150.0, 100.0),

                                   const QSizeF &maximum = QSizeF(200.0, 100.0),

                                   const QString &name = "0")

{

    QGraphicsProxyWidget *w = new QGraphicsProxyWidget;

    w->setWidget(new QPushButton(name));

    w->setData(0, name);

    w->setMinimumSize(minimum);

    w->setPreferredSize(preferred);

    w->setMaximumSize(maximum);

    w->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

    return w;

}

int main(int argc, char **argv)

{

    QApplication app(argc, argv);

    QGraphicsScene scene;

    scene.setSceneRect(0, 0, 800, 480);

    QSizeF minSize(30, 100);

    QSizeF prefSize(210, 100);

    QSizeF maxSize(300, 100);

    QGraphicsProxyWidget *a = createItem(minSize, prefSize, maxSize, "A");

    QGraphicsProxyWidget *b = createItem(minSize, prefSize, maxSize, "B");

    QGraphicsProxyWidget *c = createItem(minSize, prefSize, maxSize, "C");

    QGraphicsProxyWidget *d = createItem(minSize, prefSize, maxSize, "D");

    QGraphicsProxyWidget *e = createItem(minSize, prefSize, maxSize, "E");

    QGraphicsProxyWidget *f = createItem(QSizeF(30, 50), QSizeF(150, 50), maxSize, "F");

    QGraphicsProxyWidget *g = createItem(QSizeF(30, 50), QSizeF(30, 100), maxSize, "G");

    QGraphicsAnchorLayout *l = new QGraphicsAnchorLayout;

    l->setSpacing(0);

    QGraphicsWidget *w = new QGraphicsWidget(0, Qt::Window);

    w->setPos(20, 20);

    w->setLayout(l);

    // vertical

    QGraphicsAnchor *anchor = l->addAnchor(a, Qt::AnchorTop, l, Qt::AnchorTop);

    anchor = l->addAnchor(b, Qt::AnchorTop, l, Qt::AnchorTop);

    anchor = l->addAnchor(c, Qt::AnchorTop, a, Qt::AnchorBottom);

    anchor = l->addAnchor(c, Qt::AnchorTop, b, Qt::AnchorBottom);

    anchor = l->addAnchor(c, Qt::AnchorBottom, d, Qt::AnchorTop);

    anchor = l->addAnchor(c, Qt::AnchorBottom, e, Qt::AnchorTop);

    anchor = l->addAnchor(d, Qt::AnchorBottom, l, Qt::AnchorBottom);

    anchor = l->addAnchor(e, Qt::AnchorBottom, l, Qt::AnchorBottom);

    anchor = l->addAnchor(c, Qt::AnchorTop, f, Qt::AnchorTop);

    anchor = l->addAnchor(c, Qt::AnchorVerticalCenter, f, Qt::AnchorBottom);

    anchor = l->addAnchor(f, Qt::AnchorBottom, g, Qt::AnchorTop);

    anchor = l->addAnchor(c, Qt::AnchorBottom, g, Qt::AnchorBottom);

    // horizontal

    anchor = l->addAnchor(l, Qt::AnchorLeft, a, Qt::AnchorLeft);

    anchor = l->addAnchor(l, Qt::AnchorLeft, d, Qt::AnchorLeft);

    anchor = l->addAnchor(a, Qt::AnchorRight, b, Qt::AnchorLeft);

    anchor = l->addAnchor(a, Qt::AnchorRight, c, Qt::AnchorLeft);

    anchor = l->addAnchor(c, Qt::AnchorRight, e, Qt::AnchorLeft);

    anchor = l->addAnchor(b, Qt::AnchorRight, l, Qt::AnchorRight);

    anchor = l->addAnchor(e, Qt::AnchorRight, l, Qt::AnchorRight);

    anchor = l->addAnchor(d, Qt::AnchorRight, e, Qt::AnchorLeft);

    anchor = l->addAnchor(l, Qt::AnchorLeft, f, Qt::AnchorLeft);

    anchor = l->addAnchor(l, Qt::AnchorLeft, g, Qt::AnchorLeft);

    anchor = l->addAnchor(f, Qt::AnchorRight, g, Qt::AnchorRight);

    scene.addItem(w);

    scene.setBackgroundBrush(Qt::darkGreen);

    QGraphicsView *view = new QGraphicsView(&scene);

    view->show();

    return app.exec();

}