Qt Reference Documentation

# main.cpp Example File

graphicsview/anchorlayout/main.cpp

     /****************************************************************************
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     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the examples of the Qt Toolkit.
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     #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();
     }