Obsolete Members for QGraphicsScene

The following class members are obsolete. They are provided to keep old source code working. We strongly advise against using them in new code.

• QGraphicsScene class reference

Properties

• sortCacheEnabled : bool (obsolete)

Protected Functions

Property Documentation

sortCacheEnabled : bool

This property holds whether sort caching is enabled.

Since Qt 4.6, this property has no effect.

This property was introduced in Qt 4.5.

Access functions:

Member Function Documentation

void QGraphicsScene::drawItems(QPainter * painter, int numItems, QGraphicsItem *[] items, const QStyleOptionGraphicsItem[] options, QWidget * widget = 0) [virtual protected]

Paints the given items using the provided painter, after the background has been drawn, and before the foreground has been drawn. All painting is done in scene coordinates. Before drawing each item, the painter must be transformed using QGraphicsItem::sceneTransform().

The options parameter is the list of style option objects for each item in items. The numItems parameter is the number of items in items and options in options. The widget parameter is optional; if specified, it should point to the widget that is being painted on.

The default implementation prepares the painter matrix, and calls QGraphicsItem::paint() on all items. Reimplement this function to provide custom painting of all items for the scene; gaining complete control over how each item is drawn. In some cases this can increase drawing performance significantly.

Example:

 void CustomScene::drawItems(QPainter *painter, int numItems,
                             QGraphicsItem *items[],
                             const QStyleOptionGraphicsItem options[],
                             QWidget *widget)
 {
     for (int i = 0; i < numItems; ++i) {
          // Draw the item
          painter->save();
          painter->setMatrix(items[i]->sceneMatrix(), true);
          items[i]->paint(painter, &options[i], widget);
          painter->restore();
      }
 }

Since Qt 4.6, this function is not called anymore unless the QGraphicsView::IndirectPainting flag is given as an Optimization flag.

See also drawBackground() and drawForeground().