Simple Anchor Layout Example
Demonstrates anchor layout on a graphics view scene.
The Simple Anchor Layout example shows the basic use of the QGraphicsAnchorLayout class.

The example starts by creating a QGraphicsScene (scene), 3 widgets (a, b, and c), and a QGraphicsAnchorlayout (layout).
     QGraphicsScene scene;
     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;
First it anchors the top left corner of item a to the top left corner of layout. This can be done in two steps:
     layout->addAnchor(a, Qt::AnchorTop, layout, Qt::AnchorTop);
     layout->addAnchor(a, Qt::AnchorLeft, layout, Qt::AnchorLeft);
Or in one step:
     layout->addCornerAnchors(a, Qt::TopLeftCorner, layout, Qt::TopLeftCorner);
Then the right anchor of a is anchored to the left anchor of b, and the top of item b is anchored to the bottom of a.
     layout->addAnchor(b, Qt::AnchorLeft, a, Qt::AnchorRight);
     layout->addAnchor(b, Qt::AnchorTop, a, Qt::AnchorBottom);
Place a third widget c under widget b:
     layout->addAnchor(b, Qt::AnchorBottom, c, Qt::AnchorTop);
Items b and c are anchored to each other horizontally:
     layout->addAnchors(b, c, Qt::Horizontal);
Item c is anchored to the bottom right point of layout
     layout->addCornerAnchors(c, Qt::BottomRightCorner, layout, Qt::BottomRightCorner);
Finally, QGraphicsWidget w is displayed in QGraphicsView view.
     auto w = new QGraphicsWidget(nullptr, 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;
     view.setScene(&scene);
     view.setWindowTitle(QApplication::translate("simpleanchorlayout", "Simple Anchor Layout"));
     view.resize(360, 320);
     view.show();
     return app.exec();
See also Anchor Layout Example.