Qt 5.11 | Qt Widgets | Anchor Layout Example | main.cpp Example File

Qt 5.11.3 Reference Documentation

# main.cpp Example File

graphicsview/anchorlayout/main.cpp

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      #include <QtWidgets>

      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
          l->addAnchor(a, Qt::AnchorTop, l, Qt::AnchorTop);
          l->addAnchor(b, Qt::AnchorTop, l, Qt::AnchorTop);

          l->addAnchor(c, Qt::AnchorTop, a, Qt::AnchorBottom);
          l->addAnchor(c, Qt::AnchorTop, b, Qt::AnchorBottom);
          l->addAnchor(c, Qt::AnchorBottom, d, Qt::AnchorTop);
          l->addAnchor(c, Qt::AnchorBottom, e, Qt::AnchorTop);

          l->addAnchor(d, Qt::AnchorBottom, l, Qt::AnchorBottom);
          l->addAnchor(e, Qt::AnchorBottom, l, Qt::AnchorBottom);

          l->addAnchor(c, Qt::AnchorTop, f, Qt::AnchorTop);
          l->addAnchor(c, Qt::AnchorVerticalCenter, f, Qt::AnchorBottom);
          l->addAnchor(f, Qt::AnchorBottom, g, Qt::AnchorTop);
          l->addAnchor(c, Qt::AnchorBottom, g, Qt::AnchorBottom);

          // horizontal
          l->addAnchor(l, Qt::AnchorLeft, a, Qt::AnchorLeft);
          l->addAnchor(l, Qt::AnchorLeft, d, Qt::AnchorLeft);
          l->addAnchor(a, Qt::AnchorRight, b, Qt::AnchorLeft);

          l->addAnchor(a, Qt::AnchorRight, c, Qt::AnchorLeft);
          l->addAnchor(c, Qt::AnchorRight, e, Qt::AnchorLeft);

          l->addAnchor(b, Qt::AnchorRight, l, Qt::AnchorRight);
          l->addAnchor(e, Qt::AnchorRight, l, Qt::AnchorRight);
          l->addAnchor(d, Qt::AnchorRight, e, Qt::AnchorLeft);

          l->addAnchor(l, Qt::AnchorLeft, f, Qt::AnchorLeft);
          l->addAnchor(l, Qt::AnchorLeft, g, Qt::AnchorLeft);
          l->addAnchor(f, Qt::AnchorRight, g, Qt::AnchorRight);

          scene.addItem(w);
          scene.setBackgroundBrush(Qt::darkGreen);
          QGraphicsView view(&scene);

          view.show();

          return app.exec();
      }