C++ QDeclarativeItemPrivate类代码示例

void QDeclarativeLoaderPrivate::clear()
{
    if (ownComponent) {
        component->deleteLater();
        component = 0;
        ownComponent = false;
    }
    source = QUrl();

    if (item) {
        if (QDeclarativeItem *qmlItem = qobject_cast<QDeclarativeItem*>(item)) {
            QDeclarativeItemPrivate *p =
                    static_cast<QDeclarativeItemPrivate *>(QGraphicsItemPrivate::get(qmlItem));
            p->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry);
        }

        // We can't delete immediately because our item may have triggered
        // the Loader to load a different item.
        if (item->scene()) {
            item->scene()->removeItem(item);
        } else {
            item->setParentItem(0);
            item->setVisible(false);
        }
        item->deleteLater();
        item = 0;
    }
}

QDeclarativeLoader::~QDeclarativeLoader()
{
    Q_D(QDeclarativeLoader);
    if (d->item) {
        if (QDeclarativeItem *qmlItem = qobject_cast<QDeclarativeItem*>(d->item)) {
            QDeclarativeItemPrivate *p =
                    static_cast<QDeclarativeItemPrivate *>(QGraphicsItemPrivate::get(qmlItem));
            p->removeItemChangeListener(d, QDeclarativeItemPrivate::Geometry);
        }
    }
}

void QDeclarativeBasePositionerPrivate::unwatchChanges(QGraphicsObject* other)
{
    if (QGraphicsItemPrivate::get(other)->isDeclarativeItem) {
        QDeclarativeItemPrivate *otherPrivate = static_cast<QDeclarativeItemPrivate*>(QGraphicsItemPrivate::get(other));
        otherPrivate->removeItemChangeListener(this, watchedChanges);
    } else {
        Q_Q(QDeclarativeBasePositioner);
        QObject::disconnect(other, SIGNAL(widthChanged()), q, SLOT(graphicsWidgetGeometryChanged()));
        QObject::disconnect(other, SIGNAL(heightChanged()), q, SLOT(graphicsWidgetGeometryChanged()));
        QObject::disconnect(other, SIGNAL(opacityChanged()), q, SLOT(graphicsWidgetGeometryChanged()));
        QObject::disconnect(other, SIGNAL(visibleChanged()), q, SLOT(graphicsWidgetGeometryChanged()));
    }
}

bool isAnchoredTo(QDeclarativeItem *fromItem, QDeclarativeItem *toItem)
{
    Q_ASSERT(dynamic_cast<QDeclarativeItemPrivate*>(QGraphicsItemPrivate::get(fromItem)));
    QDeclarativeItemPrivate *fromItemPrivate = static_cast<QDeclarativeItemPrivate*>(QGraphicsItemPrivate::get(fromItem));
    QDeclarativeAnchors *anchors = fromItemPrivate->anchors();
    return anchors->fill() == toItem
           || anchors->centerIn() == toItem
           || anchors->bottom().item == toItem
           || anchors->top().item == toItem
           || anchors->left().item == toItem
           || anchors->right().item == toItem
           || anchors->verticalCenter().item == toItem
           || anchors->horizontalCenter().item == toItem
           || anchors->baseline().item == toItem;
}

void QDeclarativeAnchorsPrivate::remDepend(QGraphicsObject *item)
{
    if (!item)
        return;
    QGraphicsItemPrivate * itemPrivate = QGraphicsItemPrivate::get(item);
    if (itemPrivate->isDeclarativeItem) {
        QDeclarativeItemPrivate *p =
            static_cast<QDeclarativeItemPrivate *>(itemPrivate);
        p->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry);
    } else if(itemPrivate->isWidget) {
        Q_Q(QDeclarativeAnchors);
        QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
        QObject::disconnect(widget, SIGNAL(destroyed(QObject*)), q, SLOT(_q_widgetDestroyed(QObject*)));
        QObject::disconnect(widget, SIGNAL(geometryChanged()), q, SLOT(_q_widgetGeometryChanged()));
    }
}

void QDeclarativeLoaderPrivate::initResize()
{
    Q_Q(QDeclarativeLoader);
    if (QDeclarativeItem *qmlItem = qobject_cast<QDeclarativeItem*>(item)) {
        QDeclarativeItemPrivate *p =
                static_cast<QDeclarativeItemPrivate *>(QGraphicsItemPrivate::get(qmlItem));
        p->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry);
        // We may override the item's size, so we need to remember
        // whether the item provided its own valid size.
        itemWidthValid = p->widthValid;
        itemHeightValid = p->heightValid;
    } else if (item && item->isWidget()) {
        QGraphicsWidget *widget = static_cast<QGraphicsWidget*>(item);
        widget->installEventFilter(q);
    }
    _q_updateSize();
}

void QDeclarativeBasePositionerPrivate::unwatchChanges(QDeclarativeItem* other)
{
    QDeclarativeItemPrivate *otherPrivate = static_cast<QDeclarativeItemPrivate*>(QGraphicsItemPrivate::get(other));
    otherPrivate->removeItemChangeListener(this, watchedChanges);
}