main.cpp Example File
graphicsview/simpleanchorlayout/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.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 ** 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.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3.0 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU General Public License version 3.0 requirements will be
 ** met: http://www.gnu.org/copyleft/gpl.html.
 **
 ** If you have questions regarding the use of this file, please contact
 ** Nokia at qt-info@nokia.com.
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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 *option, QWidget *widget = 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();
 }