Anchor Layout Example

Demonstrates anchor layout in a graphics view scene.

Article lu fois.

L'auteur

The Qt Company Ltd.

L'article

Publié le 27 décembre 2024 - Mis à jour le 27 décembre 2024

Liens sociaux

Anchor Layout Example▲

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▲

Sélectionnez

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

Creating Widgets▲

Sélectionnez

    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▲

Sélectionnez

    QGraphicsAnchorLayout *l = new QGraphicsAnchorLayout;
    l-&gt;setSpacing(0);

Creating a QGraphicsWidget▲

Sélectionnez

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

Adding Anchors▲

Sélectionnez

    // vertical
    l-&gt;addAnchor(a, Qt::AnchorTop, l, Qt::AnchorTop);
    l-&gt;addAnchor(b, Qt::AnchorTop, l, Qt::AnchorTop);

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

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

    l-&gt;addAnchor(c, Qt::Anc