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.
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