diff options
Diffstat (limited to 'src/quicktemplates2/qquicktumbler.cpp')
-rw-r--r-- | src/quicktemplates2/qquicktumbler.cpp | 189 |
1 files changed, 125 insertions, 64 deletions
diff --git a/src/quicktemplates2/qquicktumbler.cpp b/src/quicktemplates2/qquicktumbler.cpp index 3429f1f4..241a5fc3 100644 --- a/src/quicktemplates2/qquicktumbler.cpp +++ b/src/quicktemplates2/qquicktumbler.cpp @@ -119,6 +119,11 @@ namespace { */ QQuickItem *QQuickTumblerPrivate::determineViewType(QQuickItem *contentItem) { + if (!contentItem) { + resetViewData(); + return nullptr; + } + if (contentItem->inherits("QQuickPathView")) { view = contentItem; viewContentItem = contentItem; @@ -139,6 +144,7 @@ QQuickItem *QQuickTumblerPrivate::determineViewType(QQuickItem *contentItem) } resetViewData(); + viewContentItemType = UnsupportedContentItemType; return nullptr; } @@ -146,7 +152,7 @@ void QQuickTumblerPrivate::resetViewData() { view = nullptr; viewContentItem = nullptr; - viewContentItemType = UnsupportedContentItemType; + viewContentItemType = NoContentItem; } QList<QQuickItem *> QQuickTumblerPrivate::viewContentItemChildItems() const @@ -484,8 +490,6 @@ void QQuickTumbler::componentComplete() { Q_D(QQuickTumbler); QQuickControl::componentComplete(); - d->_q_updateItemHeights(); - d->_q_updateItemWidths(); if (!d->view) { // Force the view to be created. @@ -493,6 +497,17 @@ void QQuickTumbler::componentComplete() // Determine the type of view for attached properties, etc. d->setupViewData(d->contentItem); } + + // If there was no contentItem or it was of an unsupported type, + // we don't have anything else to do. + if (!d->view) + return; + + // Update item heights after we've populated the model, + // otherwise ignoreSignals will cause these functions to return early. + d->_q_updateItemHeights(); + d->_q_updateItemWidths(); + d->_q_onViewCountChanged(); } void QQuickTumbler::contentItemChange(QQuickItem *newItem, QQuickItem *oldItem) @@ -511,6 +526,9 @@ void QQuickTumbler::contentItemChange(QQuickItem *newItem, QQuickItem *oldItem) // Make sure we use the new content item and not the current one, as that won't // be changed until after contentItemChange() has finished. d->setupViewData(newItem); + + d->_q_updateItemHeights(); + d->_q_updateItemWidths(); } } } @@ -545,6 +563,9 @@ void QQuickTumblerPrivate::setupViewData(QQuickItem *newControlContentItem) determineViewType(newControlContentItem); + if (viewContentItemType == QQuickTumblerPrivate::NoContentItem) + return; + if (viewContentItemType == QQuickTumblerPrivate::UnsupportedContentItemType) { qWarning() << "Tumbler: contentItem must contain either a PathView or a ListView"; return; @@ -561,6 +582,16 @@ void QQuickTumblerPrivate::setupViewData(QQuickItem *newControlContentItem) // Sync the view's currentIndex with ours. syncCurrentIndex(); + + const auto items = viewContentItemChildItems(); + for (QQuickItem *childItem : items) { + QQuickTumblerAttached *attached = qobject_cast<QQuickTumblerAttached *>( + qmlAttachedPropertiesObject<QQuickTumbler>(childItem, false)); + if (attached) { + QQuickTumblerAttachedPrivate *attachedPrivate = QQuickTumblerAttachedPrivate::get(attached); + attachedPrivate->viewDataSetUp(); + } + } } void QQuickTumblerPrivate::syncCurrentIndex() @@ -568,17 +599,27 @@ void QQuickTumblerPrivate::syncCurrentIndex() const int actualViewIndex = view->property("currentIndex").toInt(); Q_Q(QQuickTumbler); + const bool isPendingCurrentIndex = pendingCurrentIndex != -1; + const int indexToSet = isPendingCurrentIndex ? pendingCurrentIndex : currentIndex; + // Nothing to do. - if (actualViewIndex == currentIndex) + if (actualViewIndex == indexToSet) { + pendingCurrentIndex = -1; return; + } // PathView likes to use 0 as currentIndex for empty models, but we use -1 for that. if (q->count() == 0 && actualViewIndex == 0) return; ignoreCurrentIndexChanges = true; - view->setProperty("currentIndex", currentIndex); + view->setProperty("currentIndex", QVariant(indexToSet)); ignoreCurrentIndexChanges = false; + + if (view->property("currentIndex").toInt() == indexToSet) + pendingCurrentIndex = -1; + else if (isPendingCurrentIndex) + q->polish(); } void QQuickTumblerPrivate::setCount(int newCount) @@ -629,11 +670,17 @@ void QQuickTumblerPrivate::setWrap(bool shouldWrap, bool isExplicit) ignoreCurrentIndexChanges = false; - // The view should have been created now, so we can start determining its type, etc. - // If the delegates use attached properties, this will have already been called, - // in which case it will return early. If the delegate doesn't use attached properties, - // we need to call it here. - setupViewData(contentItem); + // If isComponentComplete() is true, we require a contentItem. If it's not + // true, it might not have been created yet, so we wait until + // componentComplete() is called. + // + // When the contentItem (usually QQuickTumblerView) has been created, we + // can start determining its type, etc. If the delegates use attached + // properties, this will have already been called, in which case it will + // return early. If the delegate doesn't use attached properties, we need + // to call it here. + if (q->isComponentComplete() || contentItem) + setupViewData(contentItem); q->setCurrentIndex(oldCurrentIndex); } @@ -668,6 +715,10 @@ void QQuickTumbler::updatePolish() { Q_D(QQuickTumbler); if (d->pendingCurrentIndex != -1) { + // Update our count, as ignoreSignals might have been true + // when _q_onViewCountChanged() was last called. + d->setCount(d->view->property("count").toInt()); + // If the count is still 0, it's not going to happen. if (d->count == 0) { d->pendingCurrentIndex = -1; @@ -689,53 +740,34 @@ void QQuickTumbler::updatePolish() } } -class QQuickTumblerAttachedPrivate : public QObjectPrivate, public QQuickItemChangeListener +QQuickTumblerAttachedPrivate::QQuickTumblerAttachedPrivate() + : tumbler(nullptr), + index(-1), + displacement(0) { - Q_DECLARE_PUBLIC(QQuickTumblerAttached) -public: - QQuickTumblerAttachedPrivate() - : tumbler(nullptr), - index(-1), - displacement(0) - { - } - - void init(QQuickItem *delegateItem) - { - if (!delegateItem->parentItem()) { - qWarning() << "Tumbler: attached properties must be accessed through a delegate item that has a parent"; - return; - } - - QVariant indexContextProperty = qmlContext(delegateItem)->contextProperty(QStringLiteral("index")); - if (!indexContextProperty.isValid()) { - qWarning() << "Tumbler: attempting to access attached property on item without an \"index\" property"; - return; - } - - index = indexContextProperty.toInt(); +} - QQuickItem *parentItem = delegateItem; - while ((parentItem = parentItem->parentItem())) { - if ((tumbler = qobject_cast<QQuickTumbler*>(parentItem))) - break; - } +void QQuickTumblerAttachedPrivate::init(QQuickItem *delegateItem) +{ + if (!delegateItem->parentItem()) { + qWarning() << "Tumbler: attached properties must be accessed through a delegate item that has a parent"; + return; } - void itemGeometryChanged(QQuickItem *item, QQuickGeometryChange change, const QRectF &diff) override; - void itemChildAdded(QQuickItem *, QQuickItem *) override; - void itemChildRemoved(QQuickItem *, QQuickItem *) override; + QVariant indexContextProperty = qmlContext(delegateItem)->contextProperty(QStringLiteral("index")); + if (!indexContextProperty.isValid()) { + qWarning() << "Tumbler: attempting to access attached property on item without an \"index\" property"; + return; + } - void _q_calculateDisplacement(); - void emitIfDisplacementChanged(qreal oldDisplacement, qreal newDisplacement); + index = indexContextProperty.toInt(); - // The Tumbler that contains the delegate. Required to calculated the displacement. - QPointer<QQuickTumbler> tumbler; - // The index of the delegate. Used to calculate the displacement. - int index; - // The displacement for our delegate. - qreal displacement; -}; + QQuickItem *parentItem = delegateItem; + while ((parentItem = parentItem->parentItem())) { + if ((tumbler = qobject_cast<QQuickTumbler*>(parentItem))) + break; + } +} void QQuickTumblerAttachedPrivate::itemGeometryChanged(QQuickItem *, QQuickGeometryChange, const QRectF &) { @@ -768,9 +800,9 @@ void QQuickTumblerAttachedPrivate::_q_calculateDisplacement() const int previousDisplacement = displacement; displacement = 0; - // Can happen if the attached properties are accessed on the wrong type of item or the tumbler was destroyed. if (!tumbler) { - emitIfDisplacementChanged(previousDisplacement, displacement); + // Can happen if the attached properties are accessed on the wrong type of item or the tumbler was destroyed. + // We don't want to emit the change signal though, as this could cause warnings about Tumbler.tumbler being null. return; } @@ -820,6 +852,28 @@ void QQuickTumblerAttachedPrivate::emitIfDisplacementChanged(qreal oldDisplaceme emit q->displacementChanged(); } +void QQuickTumblerAttachedPrivate::viewDataSetUp() +{ + Q_Q(QQuickTumblerAttached); + QQuickTumblerPrivate *tumblerPrivate = QQuickTumblerPrivate::get(tumbler); + if (!tumblerPrivate->viewContentItem) + return; + + QQuickItemPrivate *viewContentItemPrivate = QQuickItemPrivate::get(tumblerPrivate->viewContentItem); + viewContentItemPrivate->addItemChangeListener(this, QQuickItemPrivate::Geometry | QQuickItemPrivate::Children); + + const char *contentItemSignal = tumblerPrivate->viewContentItemType == QQuickTumblerPrivate::PathViewContentItem + ? SIGNAL(offsetChanged()) : SIGNAL(contentYChanged()); + QObject::connect(tumblerPrivate->view, contentItemSignal, q, SLOT(_q_calculateDisplacement())); + + _q_calculateDisplacement(); +} + +QQuickTumblerAttachedPrivate *QQuickTumblerAttachedPrivate::get(QQuickTumblerAttached *attached) +{ + return attached->d_func(); +} + QQuickTumblerAttached::QQuickTumblerAttached(QObject *parent) : QObject(*(new QQuickTumblerAttachedPrivate), parent) { @@ -839,17 +893,24 @@ QQuickTumblerAttached::QQuickTumblerAttached(QObject *parent) QQuickTumblerPrivate *tumblerPrivate = QQuickTumblerPrivate::get(d->tumbler); tumblerPrivate->setupViewData(tumblerPrivate->contentItem); - if (!tumblerPrivate->viewContentItem) - return; - - QQuickItemPrivate *p = QQuickItemPrivate::get(tumblerPrivate->viewContentItem); - p->addItemChangeListener(d, QQuickItemPrivate::Geometry | QQuickItemPrivate::Children); - - const char *contentItemSignal = tumblerPrivate->viewContentItemType == QQuickTumblerPrivate::PathViewContentItem - ? SIGNAL(offsetChanged()) : SIGNAL(contentYChanged()); - connect(tumblerPrivate->view, contentItemSignal, this, SLOT(_q_calculateDisplacement())); - - d->_q_calculateDisplacement(); + // When creating a custom contentItem with e.g. Component's createObject() function, + // the item is created and *then* assigned to Tumbler's contentItem property, + // meaning that, at this point, the tumbler's contentItem is still its old one, + // as the delegates and their attached objects are created before the contentItem is assigned. + // That's why setupViewData() calls viewDataSetUp() on each attached object: + // we have to be notified whenever the contentItem changes, as otherwise + // we may never end up using the correct view data, and end up calculating incorrect displacements. + + if (delegateItem->parentItem() == tumblerPrivate->viewContentItem) { + // This item belongs to the "new" view, meaning that the tumbler's contentItem + // was probably assigned declaratively. If the contentItem was instead created + // dynamically and then assigned (as mentioned above), these two won't + // be equal and we'll have to wait until viewDataSetUp() is called before + // connecting signals to our slots. Since viewDataSetUp() is only called once + // for each contentItem, and every attached object after the first one that is + // created would miss the chance for it to be called, we call the slot manually here. + d->viewDataSetUp(); + } } } |