92 #include "listviewwithpageheader.h"
94 #include <QCoreApplication>
97 #include <qqmlengine.h>
98 #pragma GCC diagnostic push
99 #pragma GCC diagnostic ignored "-pedantic"
100 #include <private/qqmldelegatemodel_p.h>
101 #include <private/qqmlglobal_p.h>
102 #include <private/qquickitem_p.h>
103 #include <private/qquickanimation_p.h>
104 #pragma GCC diagnostic pop
107 static const qreal bufferRatio = 0.5;
109 qreal ListViewWithPageHeader::ListItem::height()
const
111 return m_item->height() + (m_sectionItem ? m_sectionItem->height() : 0);
114 qreal ListViewWithPageHeader::ListItem::y()
const
116 return m_item->y() - (m_sectionItem ? m_sectionItem->height() : 0);
119 void ListViewWithPageHeader::ListItem::setY(qreal newY)
122 m_sectionItem->setY(newY);
123 m_item->setY(newY + m_sectionItem->height());
129 bool ListViewWithPageHeader::ListItem::culled()
const
131 return QQuickItemPrivate::get(m_item)->culled;
134 void ListViewWithPageHeader::ListItem::setCulled(
bool culled)
136 QQuickItemPrivate::get(m_item)->setCulled(culled);
138 QQuickItemPrivate::get(m_sectionItem)->setCulled(culled);
141 void ListViewWithPageHeader::ListItem::setSectionItem(QQuickItem *sectionItem)
143 m_sectionItem = sectionItem;
146 ListViewWithPageHeader::ListViewWithPageHeader()
147 : m_delegateModel(nullptr)
148 , m_asyncRequestedIndex(-1)
149 , m_delegateValidated(false)
150 , m_firstVisibleIndex(-1)
152 , m_contentHeightDirty(false)
153 , m_headerItem(nullptr)
154 , m_previousContentY(0)
155 , m_headerItemShownHeight(0)
156 , m_sectionDelegate(nullptr)
157 , m_topSectionItem(nullptr)
158 , m_forceNoClip(false)
160 , m_inContentHeightKeepHeaderShown(false)
162 m_clipItem =
new QQuickItem(contentItem());
166 m_contentYAnimation =
new QQuickNumberAnimation(
this);
167 m_contentYAnimation->setEasing(QEasingCurve::OutQuad);
168 m_contentYAnimation->setProperty(
"contentY");
169 m_contentYAnimation->setDuration(200);
170 m_contentYAnimation->setTargetObject(
this);
172 connect(
this, SIGNAL(contentWidthChanged()),
this, SLOT(onContentWidthChanged()));
173 connect(
this, SIGNAL(contentHeightChanged()),
this, SLOT(onContentHeightChanged()));
174 connect(
this, SIGNAL(heightChanged()),
this, SLOT(onHeightChanged()));
175 connect(m_contentYAnimation, SIGNAL(runningChanged(
bool)),
this, SLOT(contentYAnimationRunningChanged(
bool)));
177 setFlickableDirection(VerticalFlick);
180 ListViewWithPageHeader::~ListViewWithPageHeader()
184 QAbstractItemModel *ListViewWithPageHeader::model()
const
186 return m_delegateModel ? m_delegateModel->model().value<QAbstractItemModel *>() :
nullptr;
189 void ListViewWithPageHeader::setModel(QAbstractItemModel *model)
191 if (model != this->model()) {
192 if (!m_delegateModel) {
193 createDelegateModel();
195 disconnect(m_delegateModel, SIGNAL(modelUpdated(QQmlChangeSet,
bool)),
this, SLOT(onModelUpdated(QQmlChangeSet,
bool)));
197 m_delegateModel->setModel(QVariant::fromValue<QAbstractItemModel *>(model));
198 connect(m_delegateModel, SIGNAL(modelUpdated(QQmlChangeSet,
bool)),
this, SLOT(onModelUpdated(QQmlChangeSet,
bool)));
199 Q_EMIT modelChanged();
207 QQmlComponent *ListViewWithPageHeader::delegate()
const
209 return m_delegateModel ? m_delegateModel->delegate() :
nullptr;
212 void ListViewWithPageHeader::setDelegate(QQmlComponent *delegate)
214 if (delegate != this->delegate()) {
215 if (!m_delegateModel) {
216 createDelegateModel();
220 Q_FOREACH(ListItem *item, m_visibleItems)
222 m_visibleItems.clear();
223 m_firstVisibleIndex = -1;
227 if (m_topSectionItem) {
228 QQuickItemPrivate::get(m_topSectionItem)->setCulled(
true);
231 m_delegateModel->setDelegate(delegate);
233 Q_EMIT delegateChanged();
234 m_delegateValidated =
false;
235 m_contentHeightDirty =
true;
240 QQuickItem *ListViewWithPageHeader::header()
const
245 void ListViewWithPageHeader::setHeader(QQuickItem *headerItem)
247 if (m_headerItem != headerItem) {
248 qreal oldHeaderHeight = 0;
249 qreal oldHeaderY = 0;
251 oldHeaderHeight = m_headerItem->height();
252 oldHeaderY = m_headerItem->y();
253 m_headerItem->setParentItem(
nullptr);
255 m_headerItem = headerItem;
257 m_headerItem->setParentItem(contentItem());
258 m_headerItem->setZ(1);
259 m_previousHeaderImplicitHeight = m_headerItem->implicitHeight();
260 QQuickItemPrivate::get(m_headerItem)->addItemChangeListener(
this, QQuickItemPrivate::ImplicitHeight);
262 qreal newHeaderHeight = m_headerItem ? m_headerItem->height() : 0;
263 if (!m_visibleItems.isEmpty() && newHeaderHeight != oldHeaderHeight) {
264 headerHeightChanged(newHeaderHeight, oldHeaderHeight, oldHeaderY);
266 m_contentHeightDirty =
true;
268 Q_EMIT headerChanged();
272 QQmlComponent *ListViewWithPageHeader::sectionDelegate()
const
274 return m_sectionDelegate;
277 void ListViewWithPageHeader::setSectionDelegate(QQmlComponent *delegate)
279 if (delegate != m_sectionDelegate) {
282 m_sectionDelegate = delegate;
284 m_topSectionItem = getSectionItem(QString());
285 m_topSectionItem->setZ(3);
286 QQuickItemPrivate::get(m_topSectionItem)->setCulled(
true);
287 connect(m_topSectionItem, SIGNAL(heightChanged()), SIGNAL(stickyHeaderHeightChanged()));
291 Q_EMIT sectionDelegateChanged();
292 Q_EMIT stickyHeaderHeightChanged();
296 QString ListViewWithPageHeader::sectionProperty()
const
298 return m_sectionProperty;
301 void ListViewWithPageHeader::setSectionProperty(
const QString &property)
303 if (property != m_sectionProperty) {
304 m_sectionProperty = property;
306 updateWatchedRoles();
310 Q_EMIT sectionPropertyChanged();
314 bool ListViewWithPageHeader::forceNoClip()
const
316 return m_forceNoClip;
319 void ListViewWithPageHeader::setForceNoClip(
bool noClip)
321 if (noClip != m_forceNoClip) {
322 m_forceNoClip = noClip;
324 Q_EMIT forceNoClipChanged();
328 int ListViewWithPageHeader::stickyHeaderHeight()
const
330 return m_topSectionItem ? m_topSectionItem->height() : 0;
333 qreal ListViewWithPageHeader::headerItemShownHeight()
const
335 return m_headerItemShownHeight;
338 void ListViewWithPageHeader::positionAtBeginning()
340 if (m_delegateModel->count() <= 0)
343 qreal headerHeight = (m_headerItem ? m_headerItem->height() : 0);
344 if (m_firstVisibleIndex != 0) {
348 Q_FOREACH(ListItem *item, m_visibleItems)
350 m_visibleItems.clear();
351 m_firstVisibleIndex = -1;
355 ListItem *item = createItem(0, false);
358 qreal pos = item->y() + item->height();
359 const qreal buffer = height() * bufferRatio;
360 const qreal bufferTo = height() + buffer;
361 while (modelIndex < m_delegateModel->count() && pos <= bufferTo) {
362 if (!(item = createItem(modelIndex,
false)))
364 pos += item->height();
368 m_previousContentY = m_visibleItems.first()->y() - headerHeight;
370 setContentY(m_visibleItems.first()->y() + m_clipItem->y() - headerHeight);
376 m_headerItem->setY(-m_minYExtent);
380 static inline bool uFuzzyCompare(qreal r1, qreal r2)
382 return qFuzzyCompare(r1, r2) || (qFuzzyIsNull(r1) && qFuzzyIsNull(r2));
385 void ListViewWithPageHeader::showHeader()
390 const auto to = qMax(-minYExtent(), contentY() - m_headerItem->height() + m_headerItemShownHeight);
391 if (!uFuzzyCompare(to, contentY())) {
392 const bool headerShownByItsOwn = contentY() < m_headerItem->y() + m_headerItem->height();
393 if (headerShownByItsOwn && m_headerItemShownHeight == 0) {
397 m_headerItemShownHeight = m_headerItem->y() + m_headerItem->height() - contentY();
398 if (!m_visibleItems.isEmpty()) {
400 ListItem *firstItem = m_visibleItems.first();
401 firstItem->setY(firstItem->y() - m_headerItemShownHeight);
404 Q_EMIT headerItemShownHeightChanged();
406 m_contentYAnimation->setTo(to);
407 contentYAnimationType = ContentYAnimationShowHeader;
408 m_contentYAnimation->start();
412 QQuickItem *ListViewWithPageHeader::item(
int modelIndex)
const
414 ListItem *item = itemAtIndex(modelIndex);
421 bool ListViewWithPageHeader::maximizeVisibleArea(
int modelIndex)
423 ListItem *listItem = itemAtIndex(modelIndex);
425 return maximizeVisibleArea(listItem, listItem->height());
431 bool ListViewWithPageHeader::maximizeVisibleArea(
int modelIndex,
int itemHeight)
436 ListItem *listItem = itemAtIndex(modelIndex);
438 return maximizeVisibleArea(listItem, itemHeight + (listItem->sectionItem() ? listItem->sectionItem()->height() : 0));
444 bool ListViewWithPageHeader::maximizeVisibleArea(ListItem *listItem,
int listItemHeight)
448 const auto listItemY = m_clipItem->y() + listItem->y();
449 if (listItemY > contentY() && listItemY + listItemHeight > contentY() + height()) {
451 const auto to = qMin(listItemY, listItemY + listItemHeight - height());
452 m_contentYAnimation->setTo(to);
453 contentYAnimationType = ContentYAnimationMaximizeVisibleArea;
454 m_contentYAnimation->start();
455 }
else if ((listItemY < contentY() && listItemY + listItemHeight < contentY() + height()) ||
456 (m_topSectionItem && !listItem->sectionItem() && listItemY - m_topSectionItem->height() < contentY() && listItemY + listItemHeight < contentY() + height()))
459 auto realVisibleListItemY = listItemY;
460 if (m_topSectionItem) {
464 bool topSectionShown = !QQuickItemPrivate::get(m_topSectionItem)->culled;
465 if (topSectionShown && !listItem->sectionItem()) {
466 realVisibleListItemY -= m_topSectionItem->height();
469 const auto to = qMax(realVisibleListItemY, listItemY + listItemHeight - height());
470 m_contentYAnimation->setTo(to);
471 contentYAnimationType = ContentYAnimationMaximizeVisibleArea;
472 m_contentYAnimation->start();
479 qreal ListViewWithPageHeader::minYExtent()
const
485 void ListViewWithPageHeader::componentComplete()
488 m_delegateModel->componentComplete();
490 QQuickFlickable::componentComplete();
495 void ListViewWithPageHeader::viewportMoved(Qt::Orientations orient)
500 if (!QQmlEngine::contextForObject(
this)->parentContext())
503 QQuickFlickable::viewportMoved(orient);
505 const qreal diff = m_previousContentY - contentY();
507 m_previousContentY = contentY();
512 void ListViewWithPageHeader::adjustHeader(qreal diff)
514 const bool showHeaderAnimationRunning = m_contentYAnimation->isRunning() && contentYAnimationType == ContentYAnimationShowHeader;
516 const auto oldHeaderItemShownHeight = m_headerItemShownHeight;
517 if (uFuzzyCompare(contentY(), -m_minYExtent) || contentY() > -m_minYExtent) {
518 m_headerItem->setHeight(m_headerItem->implicitHeight());
522 const bool scrolledUp = m_previousContentY > contentY();
523 const bool notRebounding = contentY() + height() < contentHeight();
524 const bool notShownByItsOwn = contentY() + diff >= m_headerItem->y() + m_headerItem->height();
525 const bool maximizeVisibleAreaRunning = m_contentYAnimation->isRunning() && contentYAnimationType == ContentYAnimationMaximizeVisibleArea;
527 if (!scrolledUp && (contentY() == -m_minYExtent || (m_headerItemShownHeight == 0 && m_previousContentY == m_headerItem->y()))) {
528 m_headerItemShownHeight = 0;
529 m_headerItem->setY(-m_minYExtent);
530 }
else if ((scrolledUp && notRebounding && notShownByItsOwn && !maximizeVisibleAreaRunning) || (m_headerItemShownHeight > 0) || m_inContentHeightKeepHeaderShown) {
531 if (maximizeVisibleAreaRunning && diff > 0) {
533 m_headerItemShownHeight -= diff;
535 m_headerItemShownHeight += diff;
537 if (uFuzzyCompare(contentY(), -m_minYExtent)) {
538 m_headerItemShownHeight = 0;
540 m_headerItemShownHeight = qBound(static_cast<qreal>(0.), m_headerItemShownHeight, m_headerItem->height());
542 if (m_headerItemShownHeight > 0) {
543 if (uFuzzyCompare(m_headerItem->height(), m_headerItemShownHeight)) {
544 m_headerItem->setY(contentY());
545 m_headerItemShownHeight = m_headerItem->height();
547 m_headerItem->setY(contentY() - m_headerItem->height() + m_headerItemShownHeight);
550 m_headerItem->setY(-m_minYExtent);
553 Q_EMIT headerItemShownHeightChanged();
556 m_headerItem->setY(contentY());
557 m_headerItem->setHeight(m_headerItem->implicitHeight() + (-m_minYExtent - contentY()));
562 if (!showHeaderAnimationRunning) {
563 diff += oldHeaderItemShownHeight - m_headerItemShownHeight;
568 if (!m_visibleItems.isEmpty()) {
570 ListItem *firstItem = m_visibleItems.first();
571 firstItem->setY(firstItem->y() + diff);
572 if (showHeaderAnimationRunning) {
578 void ListViewWithPageHeader::createDelegateModel()
580 m_delegateModel =
new QQmlDelegateModel(qmlContext(
this),
this);
581 connect(m_delegateModel, SIGNAL(createdItem(
int,QObject*)),
this, SLOT(itemCreated(
int,QObject*)));
582 if (isComponentComplete())
583 m_delegateModel->componentComplete();
584 updateWatchedRoles();
587 void ListViewWithPageHeader::refill()
592 if (!isComponentComplete()) {
596 const qreal buffer = height() * bufferRatio;
597 const qreal from = contentY();
598 const qreal to = from + height();
599 const qreal bufferFrom = from - buffer;
600 const qreal bufferTo = to + buffer;
602 bool added = addVisibleItems(from, to,
false);
603 bool removed = removeNonVisibleItems(bufferFrom, bufferTo);
604 added |= addVisibleItems(bufferFrom, bufferTo,
true);
606 if (added || removed) {
607 m_contentHeightDirty =
true;
611 bool ListViewWithPageHeader::addVisibleItems(qreal fillFrom, qreal fillTo,
bool asynchronous)
616 if (m_delegateModel->count() == 0)
624 if (!m_visibleItems.isEmpty()) {
625 modelIndex = m_firstVisibleIndex + m_visibleItems.count();
626 item = m_visibleItems.last();
627 pos = item->y() + item->height() + m_clipItem->y();
629 bool changed =
false;
631 while (modelIndex < m_delegateModel->count() && pos <= fillTo) {
633 if (!(item = createItem(modelIndex, asynchronous)))
635 pos += item->height();
642 if (!m_visibleItems.isEmpty()) {
643 modelIndex = m_firstVisibleIndex - 1;
644 item = m_visibleItems.first();
645 pos = item->y() + m_clipItem->y();
647 while (modelIndex >= 0 && pos > fillFrom) {
649 if (!(item = createItem(modelIndex, asynchronous)))
651 pos -= item->height();
659 void ListViewWithPageHeader::reallyReleaseItem(ListItem *listItem)
661 QQuickItem *item = listItem->m_item;
662 QQmlDelegateModel::ReleaseFlags flags = m_delegateModel->release(item);
663 if (flags & QQmlDelegateModel::Destroyed) {
664 item->setParentItem(
nullptr);
666 listItem->sectionItem()->deleteLater();
670 void ListViewWithPageHeader::releaseItem(ListItem *listItem)
672 QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(listItem->m_item);
673 itemPrivate->removeItemChangeListener(
this, QQuickItemPrivate::Geometry);
674 m_itemsToRelease << listItem;
677 void ListViewWithPageHeader::updateWatchedRoles()
679 if (m_delegateModel) {
680 QList<QByteArray> roles;
681 if (!m_sectionProperty.isEmpty())
682 roles << m_sectionProperty.toUtf8();
683 m_delegateModel->setWatchedRoles(roles);
687 QQuickItem *ListViewWithPageHeader::getSectionItem(
int modelIndex,
bool alreadyInserted)
689 if (!m_sectionDelegate)
692 const QString section = m_delegateModel->stringValue(modelIndex, m_sectionProperty);
694 if (modelIndex > 0) {
695 const QString prevSection = m_delegateModel->stringValue(modelIndex - 1, m_sectionProperty);
696 if (section == prevSection)
699 if (modelIndex + 1 < model()->rowCount() && !alreadyInserted) {
701 const QString nextSection = m_delegateModel->stringValue(modelIndex + 1, m_sectionProperty);
702 if (section == nextSection) {
704 ListItem *nextItem = itemAtIndex(modelIndex);
706 QQuickItem *sectionItem = nextItem->sectionItem();
707 nextItem->setSectionItem(
nullptr);
713 return getSectionItem(section);
716 QQuickItem *ListViewWithPageHeader::getSectionItem(
const QString §ionText)
718 QQuickItem *sectionItem =
nullptr;
720 QQmlContext *creationContext = m_sectionDelegate->creationContext();
721 QQmlContext *context =
new QQmlContext(creationContext ? creationContext : qmlContext(
this));
722 context->setContextProperty(QLatin1String(
"section"), sectionText);
723 context->setContextProperty(QLatin1String(
"delegateIndex"), -1);
724 QObject *nobj = m_sectionDelegate->beginCreate(context);
726 QQml_setParent_noEvent(context, nobj);
727 sectionItem = qobject_cast<QQuickItem *>(nobj);
731 sectionItem->setZ(2);
732 QQml_setParent_noEvent(sectionItem, m_clipItem);
733 sectionItem->setParentItem(m_clipItem);
738 m_sectionDelegate->completeCreate();
745 bool ListViewWithPageHeader::removeNonVisibleItems(qreal bufferFrom, qreal bufferTo)
750 if (contentY() < -m_minYExtent) {
752 }
else if (contentY() + height() > contentHeight()) {
755 bool changed =
false;
757 bool foundVisible =
false;
759 int removedItems = 0;
760 const auto oldFirstVisibleIndex = m_firstVisibleIndex;
761 while (i < m_visibleItems.count()) {
762 ListItem *item = m_visibleItems[i];
763 const qreal pos = item->y() + m_clipItem->y();
765 if (pos + item->height() < bufferFrom || pos > bufferTo) {
768 m_visibleItems.removeAt(i);
774 const int itemIndex = m_firstVisibleIndex + removedItems + i;
775 m_firstVisibleIndex = itemIndex;
781 m_firstVisibleIndex = -1;
783 if (m_firstVisibleIndex != oldFirstVisibleIndex) {
790 ListViewWithPageHeader::ListItem *ListViewWithPageHeader::createItem(
int modelIndex,
bool asynchronous)
793 if (asynchronous && m_asyncRequestedIndex != -1)
796 m_asyncRequestedIndex = -1;
797 QObject*
object = m_delegateModel->object(modelIndex, asynchronous);
798 QQuickItem *item = qmlobject_cast<QQuickItem*>(object);
801 m_delegateModel->release(
object);
802 if (!m_delegateValidated) {
803 m_delegateValidated =
true;
804 QObject* delegateObj = delegate();
805 qmlInfo(delegateObj ? delegateObj :
this) <<
"Delegate must be of Item type";
808 m_asyncRequestedIndex = modelIndex;
813 ListItem *listItem =
new ListItem;
814 listItem->m_item = item;
815 listItem->setSectionItem(getSectionItem(modelIndex,
false ));
816 QQuickItemPrivate::get(item)->addItemChangeListener(
this, QQuickItemPrivate::Geometry);
817 ListItem *prevItem = itemAtIndex(modelIndex - 1);
818 bool lostItem =
false;
822 listItem->setY(prevItem->y() + prevItem->height());
824 ListItem *currItem = itemAtIndex(modelIndex);
827 listItem->setY(currItem->y() - listItem->height());
829 ListItem *nextItem = itemAtIndex(modelIndex + 1);
831 listItem->setY(nextItem->y() - listItem->height());
832 }
else if (modelIndex == 0) {
833 listItem->setY(m_headerItem ? m_headerItem->height() : 0);
834 }
else if (!m_visibleItems.isEmpty()) {
840 listItem->setCulled(
true);
841 releaseItem(listItem);
844 listItem->setCulled(listItem->y() + listItem->height() + m_clipItem->y() <= contentY() || listItem->y() + m_clipItem->y() >= contentY() + height());
845 if (m_visibleItems.isEmpty()) {
846 m_visibleItems << listItem;
848 m_visibleItems.insert(modelIndex - m_firstVisibleIndex, listItem);
850 if (m_firstVisibleIndex < 0 || modelIndex < m_firstVisibleIndex) {
851 m_firstVisibleIndex = modelIndex;
854 if (listItem->sectionItem()) {
855 QQmlContext *context = QQmlEngine::contextForObject(listItem->sectionItem())->parentContext();
856 context->setContextProperty(QLatin1String(
"delegateIndex"), modelIndex);
859 m_contentHeightDirty =
true;
865 void ListViewWithPageHeader::itemCreated(
int modelIndex, QObject *
object)
867 QQuickItem *item = qmlobject_cast<QQuickItem*>(object);
869 qWarning() <<
"ListViewWithPageHeader::itemCreated got a non item for index" << modelIndex;
876 if (!QQmlEngine::contextForObject(
this)->parentContext())
879 item->setParentItem(m_clipItem);
880 QQmlContext *context = QQmlEngine::contextForObject(item)->parentContext();
881 context->setContextProperty(QLatin1String(
"ListViewWithPageHeader"),
this);
882 context->setContextProperty(QLatin1String(
"heightToClip"), QVariant::fromValue<int>(0));
883 if (modelIndex == m_asyncRequestedIndex) {
884 createItem(modelIndex,
false);
889 void ListViewWithPageHeader::updateClipItem()
891 m_clipItem->setHeight(height() - m_headerItemShownHeight);
892 m_clipItem->setY(contentY() + m_headerItemShownHeight);
893 m_clipItem->setClip(!m_forceNoClip && m_headerItemShownHeight > 0);
896 void ListViewWithPageHeader::onContentHeightChanged()
901 void ListViewWithPageHeader::onContentWidthChanged()
903 m_clipItem->setWidth(contentItem()->width());
906 void ListViewWithPageHeader::onHeightChanged()
912 void ListViewWithPageHeader::onModelUpdated(
const QQmlChangeSet &changeSet,
bool )
916 const auto oldFirstVisibleIndex = m_firstVisibleIndex;
918 Q_FOREACH(
const QQmlChangeSet::Remove &
remove, changeSet.removes()) {
920 if (
remove.index +
remove.count > m_firstVisibleIndex &&
remove.index < m_firstVisibleIndex + m_visibleItems.count()) {
921 const qreal oldFirstValidIndexPos = m_visibleItems.first()->y();
924 bool growDown =
true;
925 for (
int i = 0; growDown && i <
remove.count; ++i) {
926 const int modelIndex =
remove.index + i;
927 ListItem *item = itemAtIndex(modelIndex);
928 if (item && !item->culled()) {
932 for (
int i =
remove.count - 1; i >= 0; --i) {
933 const int visibleIndex =
remove.index + i - m_firstVisibleIndex;
934 if (visibleIndex >= 0 && visibleIndex < m_visibleItems.count()) {
935 ListItem *item = m_visibleItems[visibleIndex];
937 if (item->sectionItem() && visibleIndex + 1 < m_visibleItems.count()) {
938 ListItem *nextItem = m_visibleItems[visibleIndex + 1];
939 if (!nextItem->sectionItem()) {
940 nextItem->setSectionItem(item->sectionItem());
941 item->setSectionItem(
nullptr);
945 m_visibleItems.removeAt(visibleIndex);
950 }
else if (
remove.index <= m_firstVisibleIndex) {
951 if (!m_visibleItems.isEmpty()) {
954 m_visibleItems.first()->setY(oldFirstValidIndexPos);
956 m_firstVisibleIndex = -1;
959 }
else if (
remove.index +
remove.count <= m_firstVisibleIndex) {
960 m_firstVisibleIndex -=
remove.count;
962 for (
int i =
remove.count - 1; i >= 0; --i) {
963 const int modelIndex =
remove.index + i;
964 if (modelIndex == m_asyncRequestedIndex) {
965 m_asyncRequestedIndex = -1;
966 }
else if (modelIndex < m_asyncRequestedIndex) {
967 m_asyncRequestedIndex--;
972 Q_FOREACH(
const QQmlChangeSet::Insert &insert, changeSet.inserts()) {
974 const bool insertingInValidIndexes = insert.index > m_firstVisibleIndex && insert.index < m_firstVisibleIndex + m_visibleItems.count();
975 const bool firstItemWithViewOnTop = insert.index == 0 && m_firstVisibleIndex == 0 && m_visibleItems.first()->y() + m_clipItem->y() > contentY();
976 if (insertingInValidIndexes || firstItemWithViewOnTop)
981 if (!firstItemWithViewOnTop) {
982 for (
int i = 0; i < m_visibleItems.count(); ++i) {
983 if (!m_visibleItems[i]->culled()) {
984 if (insert.index <= m_firstVisibleIndex + i) {
992 const qreal oldFirstValidIndexPos = m_visibleItems.first()->y();
993 for (
int i = insert.count - 1; i >= 0; --i) {
994 const int modelIndex = insert.index + i;
995 ListItem *item = createItem(modelIndex,
false);
997 ListItem *firstItem = m_visibleItems.first();
998 firstItem->setY(firstItem->y() - item->height());
1002 if (m_sectionDelegate) {
1003 ListItem *nextItem = itemAtIndex(modelIndex + 1);
1004 if (nextItem && !nextItem->sectionItem()) {
1005 nextItem->setSectionItem(getSectionItem(modelIndex + 1,
true ));
1006 if (growUp && nextItem->sectionItem()) {
1007 ListItem *firstItem = m_visibleItems.first();
1008 firstItem->setY(firstItem->y() - nextItem->sectionItem()->height());
1013 if (firstItemWithViewOnTop) {
1014 ListItem *firstItem = m_visibleItems.first();
1015 firstItem->setY(oldFirstValidIndexPos);
1018 }
else if (insert.index <= m_firstVisibleIndex) {
1019 m_firstVisibleIndex += insert.count;
1022 for (
int i = insert.count - 1; i >= 0; --i) {
1023 const int modelIndex = insert.index + i;
1024 if (modelIndex <= m_asyncRequestedIndex) {
1025 m_asyncRequestedIndex++;
1030 Q_FOREACH(
const QQmlChangeSet::Change &change, changeSet.changes()) {
1032 for (
int i = change.index; i < change.count; ++i) {
1033 ListItem *item = itemAtIndex(i);
1034 if (item && item->sectionItem()) {
1035 QQmlContext *context = QQmlEngine::contextForObject(item->sectionItem())->parentContext();
1036 const QString sectionText = m_delegateModel->stringValue(i, m_sectionProperty);
1037 context->setContextProperty(QLatin1String(
"section"), sectionText);
1042 if (m_firstVisibleIndex != oldFirstVisibleIndex) {
1046 for (
int i = 0; i < m_visibleItems.count(); ++i) {
1047 ListItem *item = m_visibleItems[i];
1048 if (item->sectionItem()) {
1049 QQmlContext *context = QQmlEngine::contextForObject(item->sectionItem())->parentContext();
1050 context->setContextProperty(QLatin1String(
"delegateIndex"), m_firstVisibleIndex + i);
1056 m_contentHeightDirty =
true;
1059 void ListViewWithPageHeader::contentYAnimationRunningChanged(
bool running)
1061 setInteractive(!running);
1063 m_contentHeightDirty =
true;
1068 void ListViewWithPageHeader::itemGeometryChanged(QQuickItem * ,
const QRectF &newGeometry,
const QRectF &oldGeometry)
1070 const qreal heightDiff = newGeometry.height() - oldGeometry.height();
1071 if (heightDiff != 0) {
1072 if (!m_inContentHeightKeepHeaderShown && oldGeometry.y() + oldGeometry.height() + m_clipItem->y() <= contentY() && !m_visibleItems.isEmpty()) {
1073 ListItem *firstItem = m_visibleItems.first();
1074 firstItem->setY(firstItem->y() - heightDiff);
1081 m_contentHeightDirty =
true;
1085 void ListViewWithPageHeader::itemImplicitHeightChanged(QQuickItem *item)
1087 if (item == m_headerItem) {
1088 const qreal diff = m_headerItem->implicitHeight() - m_previousHeaderImplicitHeight;
1091 m_previousHeaderImplicitHeight = m_headerItem->implicitHeight();
1094 m_contentHeightDirty =
true;
1099 void ListViewWithPageHeader::headerHeightChanged(qreal newHeaderHeight, qreal oldHeaderHeight, qreal oldHeaderY)
1101 const qreal heightDiff = newHeaderHeight - oldHeaderHeight;
1102 if (m_headerItemShownHeight > 0) {
1105 m_headerItemShownHeight += heightDiff;
1106 m_headerItemShownHeight = qBound(static_cast<qreal>(0.), m_headerItemShownHeight, newHeaderHeight);
1109 Q_EMIT headerItemShownHeightChanged();
1111 if (oldHeaderY + oldHeaderHeight > contentY()) {
1114 ListItem *firstItem = m_visibleItems.first();
1115 firstItem->setY(firstItem->y() + heightDiff);
1126 void ListViewWithPageHeader::adjustMinYExtent()
1128 if (m_visibleItems.isEmpty()) {
1131 qreal nonCreatedHeight = 0;
1132 if (m_firstVisibleIndex != 0) {
1134 const int visibleItems = m_visibleItems.count();
1135 qreal visibleItemsHeight = 0;
1136 Q_FOREACH(ListItem *item, m_visibleItems) {
1137 visibleItemsHeight += item->height();
1139 nonCreatedHeight = m_firstVisibleIndex * visibleItemsHeight / visibleItems;
1142 const qreal headerHeight = (m_headerItem ? m_headerItem->implicitHeight() : 0);
1143 m_minYExtent = nonCreatedHeight - m_visibleItems.first()->y() - m_clipItem->y() + headerHeight;
1144 if (m_minYExtent != 0 && qFuzzyIsNull(m_minYExtent)) {
1146 m_visibleItems.first()->setY(nonCreatedHeight - m_clipItem->y() + headerHeight);
1151 ListViewWithPageHeader::ListItem *ListViewWithPageHeader::itemAtIndex(
int modelIndex)
const
1153 const int visibleIndexedModelIndex = modelIndex - m_firstVisibleIndex;
1154 if (visibleIndexedModelIndex >= 0 && visibleIndexedModelIndex < m_visibleItems.count())
1155 return m_visibleItems[visibleIndexedModelIndex];
1160 void ListViewWithPageHeader::layout()
1166 if (!m_visibleItems.isEmpty()) {
1167 const qreal visibleFrom = contentY() - m_clipItem->y() + m_headerItemShownHeight;
1168 const qreal visibleTo = contentY() + height() - m_clipItem->y();
1170 qreal pos = m_visibleItems.first()->y();
1173 int firstReallyVisibleItem = -1;
1174 int modelIndex = m_firstVisibleIndex;
1175 Q_FOREACH(ListItem *item, m_visibleItems) {
1176 const bool cull = pos + item->height() <= visibleFrom || pos >= visibleTo;
1177 item->setCulled(cull);
1179 if (!cull && firstReallyVisibleItem == -1) {
1180 firstReallyVisibleItem = modelIndex;
1181 if (m_topSectionItem) {
1187 const qreal topSectionStickPos = m_headerItemShownHeight + contentY() - m_clipItem->y();
1188 bool showStickySectionItem;
1193 if (topSectionStickPos > pos) {
1194 showStickySectionItem =
true;
1195 }
else if (topSectionStickPos == pos) {
1196 showStickySectionItem = !item->sectionItem();
1198 showStickySectionItem =
false;
1200 if (!showStickySectionItem) {
1201 QQuickItemPrivate::get(m_topSectionItem)->setCulled(
true);
1202 if (item->sectionItem()) {
1207 QQuickItemPrivate::get(item->sectionItem())->setCulled(
false);
1211 const QString section = m_delegateModel->stringValue(modelIndex, m_sectionProperty);
1212 QQmlContext *context = QQmlEngine::contextForObject(m_topSectionItem)->parentContext();
1213 context->setContextProperty(QLatin1String(
"section"), section);
1215 QQuickItemPrivate::get(m_topSectionItem)->setCulled(
false);
1216 m_topSectionItem->setY(topSectionStickPos);
1217 int delegateIndex = modelIndex;
1219 while (delegateIndex > 0) {
1220 const QString prevSection = m_delegateModel->stringValue(delegateIndex - 1, m_sectionProperty);
1221 if (prevSection != section)
1225 context->setContextProperty(QLatin1String(
"delegateIndex"), delegateIndex);
1226 if (item->sectionItem()) {
1227 QQuickItemPrivate::get(item->sectionItem())->setCulled(
true);
1232 QQmlContext *context = QQmlEngine::contextForObject(item->m_item)->parentContext();
1233 const qreal clipFrom = visibleFrom + (!item->sectionItem() && m_topSectionItem && !QQuickItemPrivate::get(m_topSectionItem)->culled ? m_topSectionItem->height() : 0);
1234 if (!cull && pos < clipFrom) {
1235 context->setContextProperty(QLatin1String(
"heightToClip"), clipFrom - pos);
1237 context->setContextProperty(QLatin1String(
"heightToClip"), QVariant::fromValue<int>(0));
1240 pos += item->height();
1246 if (m_topSectionItem) {
1247 if (firstReallyVisibleItem >= 0) {
1248 for (
int i = firstReallyVisibleItem - m_firstVisibleIndex + 1; i < m_visibleItems.count(); ++i) {
1249 ListItem *item = m_visibleItems[i];
1250 if (item->sectionItem()) {
1251 if (m_topSectionItem->y() + m_topSectionItem->height() > item->y()) {
1252 m_topSectionItem->setY(item->y() - m_topSectionItem->height());
1263 void ListViewWithPageHeader::updatePolish()
1268 if (!QQmlEngine::contextForObject(
this)->parentContext())
1271 Q_FOREACH(ListItem *item, m_itemsToRelease)
1272 reallyReleaseItem(item);
1273 m_itemsToRelease.clear();
1282 if (m_contentHeightDirty) {
1283 qreal contentHeight;
1284 if (m_visibleItems.isEmpty()) {
1285 contentHeight = m_headerItem ? m_headerItem->height() : 0;
1287 const int modelCount = model()->rowCount();
1288 const int visibleItems = m_visibleItems.count();
1289 const int lastValidIndex = m_firstVisibleIndex + visibleItems - 1;
1290 qreal nonCreatedHeight = 0;
1291 if (lastValidIndex != modelCount - 1) {
1292 const int visibleItems = m_visibleItems.count();
1293 qreal visibleItemsHeight = 0;
1294 Q_FOREACH(ListItem *item, m_visibleItems) {
1295 visibleItemsHeight += item->height();
1297 const int unknownSizes = modelCount - (m_firstVisibleIndex + visibleItems);
1298 nonCreatedHeight = unknownSizes * visibleItemsHeight / visibleItems;
1300 ListItem *item = m_visibleItems.last();
1301 contentHeight = nonCreatedHeight + item->y() + item->height() + m_clipItem->y();
1302 if (m_firstVisibleIndex != 0) {
1304 m_minYExtent = qMax(m_minYExtent, -(contentHeight - height()));
1308 m_contentHeightDirty =
false;
1310 m_inContentHeightKeepHeaderShown = m_headerItem && m_headerItem->y() == contentY();
1311 setContentHeight(contentHeight);
1312 m_inContentHeightKeepHeaderShown =
false;
1316 #include "moc_listviewwithpageheader.cpp"