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** This file is part of the examples of the Qt Toolkit.

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#include <QtGui>

class Widget : public QGraphicsWidget

{

public:

    Widget(const QColor &color, const QColor &textColor, const QString &caption,

           QGraphicsItem *parent = 0)

        : QGraphicsWidget(parent), caption(caption), color(color), textColor(textColor)

    {

    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget * = 0)

    {

        QFont font;

        font.setPixelSize(0.75 * qMin(boundingRect().width(), boundingRect().height()));

        painter->fillRect(boundingRect(), color);

        painter->save();

        painter->setFont(font);

        painter->setPen(textColor);

        painter->drawText(boundingRect(), Qt::AlignCenter, caption);

        painter->restore();

    }

private:

    QString caption;

    QColor color;

    QColor textColor;

};

int main(int argc, char *argv[])

{

    QApplication app(argc, argv);

    QGraphicsScene *scene = new QGraphicsScene();

    Widget *a = new Widget(Qt::blue, Qt::white, "a");

    a->setPreferredSize(100, 100);

    Widget *b = new Widget(Qt::green, Qt::black, "b");

    b->setPreferredSize(100, 100);

    Widget *c = new Widget(Qt::red, Qt::black, "c");

    c->setPreferredSize(100, 100);

    QGraphicsAnchorLayout *layout = new QGraphicsAnchorLayout();

/*

    //! [adding a corner anchor in two steps]

    layout->addAnchor(a, Qt::AnchorTop, layout, Qt::AnchorTop);

    layout->addAnchor(a, Qt::AnchorLeft, layout, Qt::AnchorLeft);

    //! [adding a corner anchor in two steps]

*/

    //! [adding a corner anchor]

    layout->addCornerAnchors(a, Qt::TopLeftCorner, layout, Qt::TopLeftCorner);

    //! [adding a corner anchor]

    //! [adding anchors]

    layout->addAnchor(b, Qt::AnchorLeft, a, Qt::AnchorRight);

    layout->addAnchor(b, Qt::AnchorTop, a, Qt::AnchorBottom);

    //! [adding anchors]

    // Place a third widget below the second.

    layout->addAnchor(b, Qt::AnchorBottom, c, Qt::AnchorTop);

/*

    //! [adding anchors to match sizes in two steps]

    layout->addAnchor(b, Qt::AnchorLeft, c, Qt::AnchorLeft);

    layout->addAnchor(b, Qt::AnchorRight, c, Qt::AnchorRight);

    //! [adding anchors to match sizes in two steps]

*/

    //! [adding anchors to match sizes]

    layout->addAnchors(b, c, Qt::Horizontal);

    //! [adding anchors to match sizes]

    // Anchor the bottom-right corner of the third widget to the bottom-right

    // corner of the layout.

    layout->addCornerAnchors(c, Qt::BottomRightCorner, layout, Qt::BottomRightCorner);

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

    w->setPos(20, 20);

    w->setMinimumSize(100, 100);

    w->setPreferredSize(320, 240);

    w->setLayout(layout);

    w->setWindowTitle(QApplication::translate("simpleanchorlayout", "QGraphicsAnchorLayout in use"));

    scene->addItem(w);

    QGraphicsView *view = new QGraphicsView();

    view->setScene(scene);

    view->setWindowTitle(QApplication::translate("simpleanchorlayout", "Simple Anchor Layout"));

    view->resize(360, 320);

    view->show();

    return app.exec();

}