Qt Reference Documentation

# main.cpp Example File

graphicsview/simpleanchorlayout/main.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2011 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.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** 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
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     **   * Redistributions of source code must retain the above copyright
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     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
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     **     the names of its contributors may be used to endorse or promote
     **     products derived from this software without specific prior written
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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();
     /*
         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();
     }