Maximum Size of QPixmap/QImage Windows

[JohannesMunk]

Hi!

Use the exposedRect that a graphicsitem:aint function recieves. You will need to create an item for your background set its z order to a low number and implement your own caching method..

CustomItem::CustomItem()
{
    // Need this for exposedRect to be initialized!
    setFlag(QGraphicsItem::ItemUsesExtendedStyleOption,true);
}
 
void CustomItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    // Use the exposedRect
    option->exposedRect ..
..
}

CustomItem::CustomItem()
{
    // Need this for exposedRect to be initialized!
    setFlag(QGraphicsItem::ItemUsesExtendedStyleOption,true);
}

void CustomItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    // Use the exposedRect
    option->exposedRect ..
..
}

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HIH

Johannes