Qt 5.11 | Qt Widgets | Anchor Layout Example

Qt 5.11.3 Reference Documentation

# Anchor Layout Example

Demonstrates anchor layout in a graphics view scene.

The Anchor Layout example demonstrates the use of the QGraphicsAnchorLayout class.

The basic steps of this example are:

- Create a QGraphicsScene
- Create widgets
- Create a QGraphicsAnchorLayout
- Create a QGraphicsWidget
- Add vertical and horizontal anchors between the widgets
- View the scene with a QGraphicsView object

## Creating a QGraphicsScene

          QGraphicsScene scene;
          scene.setSceneRect(0, 0, 800, 480);

## Creating Widgets

          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)");

## Creating a Layout

          QGraphicsAnchorLayout *l = new QGraphicsAnchorLayout;
          l->setSpacing(0);

## Creating a QGraphicsWidget

          QGraphicsWidget *w = new QGraphicsWidget(0, Qt::Window);
          w->setPos(20, 20);
          w->setLayout(l);

## Adding Anchors

          // 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);

## Viewing the Scene with QGraphicsView

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

          view.show();

Files:

- graphicsview/anchorlayout/anchorlayout.pro
- graphicsview/anchorlayout/main.cpp

See also Simple Anchor Layout Example.