main.cpp Example File
graphicsview/anchorlayout/main.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** No Commercial Usage
 ** This file contains pre-release code and may not be distributed.
 ** You may use this file in accordance with the terms and conditions
 ** contained in the Technology Preview License Agreement accompanying
 ** this package.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU Lesser General Public License version 2.1 requirements
 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights.  These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** If you have questions regarding the use of this file, please contact
 ** Nokia at qt-info@nokia.com.
 **
 **
 **
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

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

     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(&scene);
     view.show();

     return app.exec();
 }