From 1e3924d8f585dd9099eb74ffbc17950c693d14da Mon Sep 17 00:00:00 2001 From: Liang Qi Date: Thu, 25 Jun 2015 17:14:40 +0200 Subject: Fixed a QQuickListView crash When an ObjectModel item is removed and destroyed. Task-number: QTBUG-46798 Change-Id: Ia41dd359d9f3ec5b7af85498dc798f7ab55dca3c Reviewed-by: J-P Nurmi Reviewed-by: Alan Alpert --- src/quick/items/qquickitemview.cpp | 44 +++++++++++++++++++++--------------- src/quick/items/qquickitemview_p_p.h | 4 +++- src/quick/items/qquicklistview.cpp | 33 +++++++++++++++------------ 3 files changed, 47 insertions(+), 34 deletions(-) (limited to 'src/quick') diff --git a/src/quick/items/qquickitemview.cpp b/src/quick/items/qquickitemview.cpp index af47aa837b..7a55bd6e0a 100644 --- a/src/quick/items/qquickitemview.cpp +++ b/src/quick/items/qquickitemview.cpp @@ -71,19 +71,19 @@ FxViewItem::~FxViewItem() qreal FxViewItem::itemX() const { - return transitionableItem ? transitionableItem->itemX() : item->x(); + return transitionableItem ? transitionableItem->itemX() : (item ? item->x() : 0); } qreal FxViewItem::itemY() const { - return transitionableItem ? transitionableItem->itemY() : item->y(); + return transitionableItem ? transitionableItem->itemY() : (item ? item->y() : 0); } void FxViewItem::moveTo(const QPointF &pos, bool immediate) { if (transitionableItem) transitionableItem->moveTo(pos, immediate); - else + else if (item) item->setPosition(pos); } @@ -91,21 +91,26 @@ void FxViewItem::setVisible(bool visible) { if (!visible && transitionableItem && transitionableItem->transitionScheduledOrRunning()) return; - QQuickItemPrivate::get(item)->setCulled(!visible); + if (item) + QQuickItemPrivate::get(item)->setCulled(!visible); } void FxViewItem::trackGeometry(bool track) { if (track) { if (!trackGeom) { - QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item); - itemPrivate->addItemChangeListener(QQuickItemViewPrivate::get(view), QQuickItemPrivate::Geometry); + if (item) { + QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item); + itemPrivate->addItemChangeListener(QQuickItemViewPrivate::get(view), QQuickItemPrivate::Geometry); + } trackGeom = true; } } else { if (trackGeom) { - QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item); - itemPrivate->removeItemChangeListener(QQuickItemViewPrivate::get(view), QQuickItemPrivate::Geometry); + if (item) { + QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item); + itemPrivate->removeItemChangeListener(QQuickItemViewPrivate::get(view), QQuickItemPrivate::Geometry); + } trackGeom = false; } } @@ -2044,8 +2049,9 @@ bool QQuickItemViewPrivate::applyModelChanges(ChangeResult *totalInsertionResult currentChanges.removedItems.clear(); if (currentChanges.currentChanged) { - if (currentChanges.currentRemoved && currentItem && currentItem->attached) { - currentItem->attached->setIsCurrentItem(false); + if (currentChanges.currentRemoved && currentItem) { + if (currentItem->item && currentItem->attached) + currentItem->attached->setIsCurrentItem(false); releaseItem(currentItem); currentItem = 0; } @@ -2097,10 +2103,10 @@ bool QQuickItemViewPrivate::applyRemovalChange(const QQmlChangeSet::Change &remo } else { // removed item visibleAffected = true; - if (!removal.isMove() && item->attached) + if (!removal.isMove() && item->item && item->attached) item->attached->emitRemove(); - if (item->attached && item->attached->delayRemove() && !removal.isMove()) { + if (item->item && item->attached && item->attached->delayRemove() && !removal.isMove()) { item->index = -1; QObject::connect(item->attached, SIGNAL(delayRemoveChanged()), q, SLOT(destroyRemoved()), Qt::QueuedConnection); ++it; @@ -2357,12 +2363,14 @@ bool QQuickItemViewPrivate::releaseItem(FxViewItem *item) item->trackGeometry(false); QQmlInstanceModel::ReleaseFlags flags = model->release(item->item); - if (flags == 0) { - // item was not destroyed, and we no longer reference it. - QQuickItemPrivate::get(item->item)->setCulled(true); - unrequestedItems.insert(item->item, model->indexOf(item->item, q)); - } else if (flags & QQmlInstanceModel::Destroyed) { - item->item->setParentItem(0); + if (item->item) { + if (flags == 0) { + // item was not destroyed, and we no longer reference it. + QQuickItemPrivate::get(item->item)->setCulled(true); + unrequestedItems.insert(item->item, model->indexOf(item->item, q)); + } else if (flags & QQmlInstanceModel::Destroyed) { + item->item->setParentItem(0); + } } delete item; return flags != QQmlInstanceModel::Referenced; diff --git a/src/quick/items/qquickitemview_p_p.h b/src/quick/items/qquickitemview_p_p.h index 5ac88a7585..67ef413d31 100644 --- a/src/quick/items/qquickitemview_p_p.h +++ b/src/quick/items/qquickitemview_p_p.h @@ -53,6 +53,8 @@ public: qreal itemX() const; qreal itemY() const; + inline qreal itemWidth() const { return item ? item->width() : 0; } + inline qreal itemHeight() const { return item ? item->height() : 0; } void moveTo(const QPointF &pos, bool immediate); void setVisible(bool visible); @@ -75,7 +77,7 @@ public: virtual bool contains(qreal x, qreal y) const = 0; - QQuickItem *item; + QPointer item; QQuickItemView *view; QQuickItemViewTransitionableItem *transitionableItem; QQuickItemViewAttached *attached; diff --git a/src/quick/items/qquicklistview.cpp b/src/quick/items/qquicklistview.cpp index eec36b59c8..c0287168f3 100644 --- a/src/quick/items/qquicklistview.cpp +++ b/src/quick/items/qquicklistview.cpp @@ -267,18 +267,18 @@ public: } qreal itemPosition() const { if (view->orientation() == QQuickListView::Vertical) - return (view->verticalLayoutDirection() == QQuickItemView::BottomToTop ? -item->height()-itemY() : itemY()); + return (view->verticalLayoutDirection() == QQuickItemView::BottomToTop ? -itemHeight()-itemY() : itemY()); else - return (view->effectiveLayoutDirection() == Qt::RightToLeft ? -item->width()-itemX() : itemX()); + return (view->effectiveLayoutDirection() == Qt::RightToLeft ? -itemWidth()-itemX() : itemX()); } qreal size() const { if (section()) - return (view->orientation() == QQuickListView::Vertical ? item->height()+section()->height() : item->width()+section()->width()); + return (view->orientation() == QQuickListView::Vertical ? itemHeight()+section()->height() : itemWidth()+section()->width()); else - return (view->orientation() == QQuickListView::Vertical ? item->height() : item->width()); + return (view->orientation() == QQuickListView::Vertical ? itemHeight() : itemWidth()); } qreal itemSize() const { - return (view->orientation() == QQuickListView::Vertical ? item->height() : item->width()); + return (view->orientation() == QQuickListView::Vertical ? itemHeight() : itemWidth()); } qreal sectionSize() const { if (section()) @@ -289,11 +289,11 @@ public: if (view->orientation() == QQuickListView::Vertical) { return (view->verticalLayoutDirection() == QQuickItemView::BottomToTop ? -itemY() - : itemY() + item->height()); + : itemY() + itemHeight()); } else { return (view->effectiveLayoutDirection() == Qt::RightToLeft ? -itemX() - : itemX() + item->width()); + : itemX() + itemWidth()); } } void setPosition(qreal pos, bool immediate = false) { @@ -320,8 +320,8 @@ public: item->setWidth(size); } bool contains(qreal x, qreal y) const Q_DECL_OVERRIDE { - return (x >= itemX() && x < itemX() + item->width() && - y >= itemY() && y < itemY() + item->height()); + return (x >= itemX() && x < itemX() + itemWidth() && + y >= itemY() && y < itemY() + itemHeight()); } QQuickListView *view; @@ -332,7 +332,7 @@ private: if (view->verticalLayoutDirection() == QQuickItemView::BottomToTop) { if (section()) pos += section()->height(); - return QPointF(itemX(), -item->height() - pos); + return QPointF(itemX(), -itemHeight() - pos); } else { if (section()) pos += section()->height(); @@ -342,7 +342,7 @@ private: if (view->effectiveLayoutDirection() == Qt::RightToLeft) { if (section()) pos += section()->width(); - return QPointF(-item->width() - pos, itemY()); + return QPointF(-itemWidth() - pos, itemY()); } else { if (section()) pos += section()->width(); @@ -612,7 +612,7 @@ bool QQuickListViewPrivate::releaseItem(FxViewItem *item) QQuickListViewAttached *att = static_cast(item->attached); bool released = QQuickItemViewPrivate::releaseItem(item); - if (released && att && att->m_sectionItem) { + if (released && item->item && att && att->m_sectionItem) { // We hold no more references to this item int i = 0; do { @@ -670,7 +670,8 @@ bool QQuickListViewPrivate::addVisibleItems(qreal fillFrom, qreal fillTo, qreal qCDebug(lcItemViewDelegateLifecycle) << "refill: append item" << modelIndex << "pos" << pos << "buffer" << doBuffer << "item" << item->item->objectName(); if (!transitioner || !transitioner->canTransition(QQuickItemViewTransitioner::PopulateTransition, true)) // pos will be set by layoutVisibleItems() item->setPosition(pos, true); - QQuickItemPrivate::get(item->item)->setCulled(doBuffer); + if (item->item) + QQuickItemPrivate::get(item->item)->setCulled(doBuffer); pos += item->size() + spacing; visibleItems.append(item); ++modelIndex; @@ -688,7 +689,8 @@ bool QQuickListViewPrivate::addVisibleItems(qreal fillFrom, qreal fillTo, qreal visiblePos -= item->size() + spacing; if (!transitioner || !transitioner->canTransition(QQuickItemViewTransitioner::PopulateTransition, true)) // pos will be set by layoutVisibleItems() item->setPosition(visiblePos, true); - QQuickItemPrivate::get(item->item)->setCulled(doBuffer); + if (item->item) + QQuickItemPrivate::get(item->item)->setCulled(doBuffer); visibleItems.prepend(item); changed = true; } @@ -2851,7 +2853,8 @@ void QQuickListView::viewportMoved(Qt::Orientations orient) qreal to = d->isContentFlowReversed() ? -d->position()+d->displayMarginEnd : d->position()+d->size()+d->displayMarginEnd; for (int i = 0; i < d->visibleItems.count(); ++i) { FxViewItem *item = static_cast(d->visibleItems.at(i)); - QQuickItemPrivate::get(item->item)->setCulled(item->endPosition() < from || item->position() > to); + if (item->item) + QQuickItemPrivate::get(item->item)->setCulled(item->endPosition() < from || item->position() > to); } if (d->currentItem) QQuickItemPrivate::get(d->currentItem->item)->setCulled(d->currentItem->endPosition() < from || d->currentItem->position() > to); -- cgit v1.2.3