QVariant QDeclarativeBasePositioner::itemChange(GraphicsItemChange change,
const QVariant &value)
{
Q_D(QDeclarativeBasePositioner);
if (change == ItemChildAddedChange){
QGraphicsItem* item = value.value<QGraphicsItem*>();
QDeclarativeItem* child = 0;
if(item)
child = qobject_cast<QDeclarativeItem*>(item->toGraphicsObject());
if (child)
prePositioning();
} else if (change == ItemChildRemovedChange) {
QGraphicsItem* item = value.value<QGraphicsItem*>();
QDeclarativeItem* child = 0;
if(item)
child = qobject_cast<QDeclarativeItem*>(item->toGraphicsObject());
if (child) {
QDeclarativeBasePositioner::PositionedItem posItem(child);
int idx = positionedItems.find(posItem);
if (idx >= 0) {
d->unwatchChanges(child);
positionedItems.remove(idx);
}
prePositioning();
}
}
return QDeclarativeItem::itemChange(change, value);
}
void QDeclarativeBasePositioner::prePositioning()
{
Q_D(QDeclarativeBasePositioner);
if (!isComponentComplete())
return;
d->queuedPositioning = false;
//Need to order children by creation order modified by stacking order
QList<QGraphicsItem *> children = d->QGraphicsItemPrivate::children;
qSort(children.begin(), children.end(), d->insertionOrder);
QPODVector<PositionedItem,8> oldItems;
positionedItems.copyAndClear(oldItems);
for (int ii = 0; ii < children.count(); ++ii) {
QDeclarativeItem *child = qobject_cast<QDeclarativeItem *>(children.at(ii));
if (!child)
continue;
PositionedItem *item = 0;
PositionedItem posItem(child);
int wIdx = oldItems.find(posItem);
if (wIdx < 0) {
d->watchChanges(child);
positionedItems.append(posItem);
item = &positionedItems[positionedItems.count()-1];
item->isNew = true;
if (child->opacity() <= 0.0 || !child->isVisible())
item->isVisible = false;
} else {
item = &oldItems[wIdx];
if (child->opacity() <= 0.0 || !child->isVisible()) {
item->isVisible = false;
} else if (!item->isVisible) {
item->isVisible = true;
item->isNew = true;
} else {
item->isNew = false;
}
positionedItems.append(*item);
}
}
doPositioning();
if(d->addTransition || d->moveTransition)
finishApplyTransitions();
//Set implicit size to the size of its children
qreal h = 0.0f;
qreal w = 0.0f;
for (int i = 0; i < positionedItems.count(); ++i) {
const PositionedItem &posItem = positionedItems.at(i);
if (posItem.isVisible) {
h = qMax(h, posItem.item->y() + posItem.item->height());
w = qMax(w, posItem.item->x() + posItem.item->width());
}
}
setImplicitHeight(h);
setImplicitWidth(w);
}
void QDeclarativeBasePositioner::prePositioning()
{
Q_D(QDeclarativeBasePositioner);
if (!isComponentComplete())
return;
if (d->doingPositioning)
return;
d->queuedPositioning = false;
d->doingPositioning = true;
//Need to order children by creation order modified by stacking order
QList<QGraphicsItem *> children = d->QGraphicsItemPrivate::children;
qSort(children.begin(), children.end(), d->insertionOrder);
QPODVector<PositionedItem,8> oldItems;
positionedItems.copyAndClear(oldItems);
for (int ii = 0; ii < children.count(); ++ii) {
QDeclarativeItem *child = qobject_cast<QDeclarativeItem *>(children.at(ii));
if (!child)
continue;
QDeclarativeItemPrivate *childPrivate = static_cast<QDeclarativeItemPrivate*>(QGraphicsItemPrivate::get(child));
PositionedItem *item = 0;
PositionedItem posItem(child);
int wIdx = oldItems.find(posItem);
if (wIdx < 0) {
d->watchChanges(child);
positionedItems.append(posItem);
item = &positionedItems[positionedItems.count()-1];
item->isNew = true;
if (child->opacity() <= 0.0 || childPrivate->explicitlyHidden)
item->isVisible = false;
} else {
item = &oldItems[wIdx];
// Items are only omitted from positioning if they are explicitly hidden
// i.e. their positioning is not affected if an ancestor is hidden.
if (child->opacity() <= 0.0 || childPrivate->explicitlyHidden) {
item->isVisible = false;
} else if (!item->isVisible) {
item->isVisible = true;
item->isNew = true;
} else {
item->isNew = false;
}
positionedItems.append(*item);
}
}
QSizeF contentSize;
doPositioning(&contentSize);
if(d->addTransition || d->moveTransition)
finishApplyTransitions();
d->doingPositioning = false;
//Set implicit size to the size of its children
setImplicitHeight(contentSize.height());
setImplicitWidth(contentSize.width());
}
