main.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtWidgets>

 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();
 /*
     layout->addAnchor(a, Qt::AnchorTop, layout, Qt::AnchorTop);
     layout->addAnchor(a, Qt::AnchorLeft, layout, Qt::AnchorLeft);
 */
     layout->addCornerAnchors(a, Qt::TopLeftCorner, layout, Qt::TopLeftCorner);

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

     // Place a third widget below the second.
     layout->addAnchor(b, Qt::AnchorBottom, c, Qt::AnchorTop);

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

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

     // 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();
 }