-
Bea Lam authored
qtqml.qdocconf and qtquick.qdocconf now refer to the correct snippets and source directories. Snippet paths in .qdoc and .cpp files have been updated to refer to the new shortened path references, e.g. \snippet qml/file.cpp instead of \snippet doc/src/snippets/qml/file.cpp. This also deletes snippets from src/qml/doc/snippets that belonged under src/quick/doc/snippets (and were already duplicated there anyway) and restores some snippet files that shouldn't have been deleted. Also fixes some inline snippets to use \code .. \endcode instead of \qml .. \endqml as they contained javascript or partial QML snippets that were causing parsing errors from qdoc. There are still snippet errors arising from qmlintro.qdoc as the qmlintro snippets directory that it refers to cannot be located. There are also two references to a removed snippet identifier in examples/qml/cppextensions/plugins/plugin.cpp that need to be fixed in conjunction with the related docs in a later commit as the relevant code has changed and the docs are now invalid. Task-number: QTBUG-25721 Change-Id: I50c665245a74c140470c58a32546591d187dfe4b Reviewed-by:Chris Adams <christopher.adams@nokia.com>
4c671c04
/******************************************************************************** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).** Contact: http://www.qt-project.org/**** This file is part of the QtQml module of the Qt Toolkit.**** $QT_BEGIN_LICENSE:LGPL$** GNU Lesser General Public License Usage** This file may be used under the terms of the GNU Lesser General Public** License version 2.1 as published by the Free Software Foundation and** appearing in the file LICENSE.LGPL included in the packaging of this** file. Please review the following information to ensure the GNU Lesser** General Public License version 2.1 requirements will be met:** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.**** In addition, as a special exception, Nokia gives you certain additional** rights. These rights are described in the Nokia Qt LGPL Exception** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.**** GNU General Public License Usage** Alternatively, this file may be used under the terms of the GNU General** Public License version 3.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of this** file. Please review the following information to ensure the GNU General** Public License version 3.0 requirements will be met:** http://www.gnu.org/copyleft/gpl.html.**** Other Usage** Alternatively, this file may be used in accordance with the terms and** conditions contained in a signed written agreement between you and Nokia.************** $QT_END_LICENSE$******************************************************************************/#include "qquicklistview_p.h"#include "qquickitemview_p_p.h"#include "qquickvisualitemmodel_p.h"#include <QtQml/qqmlexpression.h>#include <QtQml/qqmlengine.h>#include <QtQml/qqmlinfo.h>#include <QtGui/qevent.h>#include <QtCore/qmath.h>#include <QtCore/qcoreapplication.h>#include <private/qquicksmoothedanimation_p_p.h>#include <private/qlistmodelinterface_p.h>#include "qplatformdefs.h"QT_BEGIN_NAMESPACE#ifndef QML_FLICK_SNAPONETHRESHOLD#define QML_FLICK_SNAPONETHRESHOLD 30#endif//#define DEBUG_DELEGATE_LIFECYCLEclass FxListItemSG;class QQuickListViewPrivate : public QQuickItemViewPrivate{ Q_DECLARE_PUBLIC(QQuickListView)public:7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
static QQuickListViewPrivate* get(QQuickListView *item) { return item->d_func(); }
virtual Qt::Orientation layoutOrientation() const;
virtual bool isContentFlowReversed() const;
bool isRightToLeft() const;
bool isBottomToTop() const;
virtual qreal positionAt(int index) const;
virtual qreal endPositionAt(int index) const;
virtual qreal originPosition() const;
virtual qreal lastPosition() const;
FxViewItem *itemBefore(int modelIndex) const;
QString sectionAt(int modelIndex);
qreal snapPosAt(qreal pos);
FxViewItem *snapItemAt(qreal pos);
virtual void init();
virtual void clear();
virtual bool addVisibleItems(qreal fillFrom, qreal fillTo, bool doBuffer);
virtual bool removeNonVisibleItems(qreal bufferFrom, qreal bufferTo);
virtual void visibleItemsChanged();
virtual FxViewItem *newViewItem(int index, QQuickItem *item);
virtual void initializeViewItem(FxViewItem *item);
virtual bool releaseItem(FxViewItem *item);
virtual void repositionItemAt(FxViewItem *item, int index, qreal sizeBuffer);
virtual void repositionPackageItemAt(QQuickItem *item, int index);
virtual void resetFirstItemPosition(qreal pos = 0.0);
virtual void adjustFirstItem(qreal forwards, qreal backwards, int);
virtual void createHighlight();
virtual void updateHighlight();
virtual void resetHighlightPosition();
virtual void setPosition(qreal pos);
virtual void layoutVisibleItems(int fromModelIndex = 0);
virtual bool applyInsertionChange(const QQuickChangeSet::Insert &insert, ChangeResult *changeResult, QList<FxViewItem *> *addedItems, QList<MovedItem> *movingIntoView);
virtual void translateAndTransitionItemsAfter(int afterIndex, const ChangeResult &insertionResult, const ChangeResult &removalResult);
virtual void updateSections();
QQuickItem *getSectionItem(const QString §ion);
void releaseSectionItem(QQuickItem *item);
void updateInlineSection(FxListItemSG *);
void updateCurrentSection();
void updateStickySections();
virtual qreal headerSize() const;
virtual qreal footerSize() const;
virtual bool showHeaderForIndex(int index) const;
virtual bool showFooterForIndex(int index) const;
virtual void updateHeader();
virtual void updateFooter();
virtual void changedVisibleIndex(int newIndex);
virtual void initializeCurrentItem();
void updateAverage();
void itemGeometryChanged(QQuickItem *item, const QRectF &newGeometry, const QRectF &oldGeometry);
virtual void fixupPosition();
virtual void fixup(AxisData &data, qreal minExtent, qreal maxExtent);
virtual void flick(QQuickItemViewPrivate::AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize,
QQuickTimeLineCallback::Callback fixupCallback, qreal velocity);
QQuickListView::Orientation orient;
qreal visiblePos;
qreal averageSize;
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qreal spacing;
QQuickListView::SnapMode snapMode;
QSmoothedAnimation *highlightPosAnimator;
QSmoothedAnimation *highlightSizeAnimator;
qreal highlightMoveSpeed;
qreal highlightResizeSpeed;
int highlightResizeDuration;
QQuickViewSection *sectionCriteria;
QString currentSection;
static const int sectionCacheSize = 5;
QQuickItem *sectionCache[sectionCacheSize];
QQuickItem *currentSectionItem;
QString currentStickySection;
QQuickItem *nextSectionItem;
QString nextStickySection;
QString lastVisibleSection;
QString nextSection;
qreal overshootDist;
bool correctFlick : 1;
bool inFlickCorrection : 1;
QQuickListViewPrivate()
: orient(QQuickListView::Vertical)
, visiblePos(0)
, averageSize(100.0), spacing(0.0)
, snapMode(QQuickListView::NoSnap)
, highlightPosAnimator(0), highlightSizeAnimator(0)
, highlightMoveSpeed(400), highlightResizeSpeed(400), highlightResizeDuration(-1)
, sectionCriteria(0), currentSectionItem(0), nextSectionItem(0)
, overshootDist(0.0), correctFlick(false), inFlickCorrection(false)
{}
~QQuickListViewPrivate() {
delete highlightPosAnimator;
delete highlightSizeAnimator;
}
friend class QQuickViewSection;
};
//----------------------------------------------------------------------------
QQuickViewSection::QQuickViewSection(QQuickListView *parent)
: QObject(parent), m_criteria(FullString), m_delegate(0), m_labelPositioning(InlineLabels)
, m_view(parent ? QQuickListViewPrivate::get(parent) : 0)
{
}
void QQuickViewSection::setProperty(const QString &property)
{
if (property != m_property) {
m_property = property;
emit propertyChanged();
m_view->updateSections();
}
}
void QQuickViewSection::setCriteria(QQuickViewSection::SectionCriteria criteria)
{
if (criteria != m_criteria) {
m_criteria = criteria;
emit criteriaChanged();
m_view->updateSections();
}
}
void QQuickViewSection::setDelegate(QQmlComponent *delegate)
{
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if (delegate != m_delegate) {
m_delegate = delegate;
emit delegateChanged();
m_view->updateSections();
}
}
QString QQuickViewSection::sectionString(const QString &value)
{
if (m_criteria == FirstCharacter)
return value.isEmpty() ? QString() : value.at(0);
else
return value;
}
void QQuickViewSection::setLabelPositioning(int l)
{
if (m_labelPositioning != l) {
m_labelPositioning = l;
emit labelPositioningChanged();
m_view->updateSections();
}
}
//----------------------------------------------------------------------------
class FxListItemSG : public FxViewItem
{
public:
FxListItemSG(QQuickItem *i, QQuickListView *v, bool own, bool trackGeometry) : FxViewItem(i, own, trackGeometry), view(v) {
attached = static_cast<QQuickListViewAttached*>(qmlAttachedPropertiesObject<QQuickListView>(item));
if (attached)
static_cast<QQuickListViewAttached*>(attached)->setView(view);
if (trackGeometry) {
QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
itemPrivate->addItemChangeListener(QQuickItemViewPrivate::get(view), QQuickItemPrivate::Geometry);
}
}
~FxListItemSG() {
if (trackGeom) {
QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
itemPrivate->removeItemChangeListener(QQuickItemViewPrivate::get(view), QQuickItemPrivate::Geometry);
}
}
inline QQuickItem *section() const {
return attached ? static_cast<QQuickListViewAttached*>(attached)->m_sectionItem : 0;
}
void setSection(QQuickItem *s) {
if (!attached)
attached = static_cast<QQuickListViewAttached*>(qmlAttachedPropertiesObject<QQuickListView>(item));
static_cast<QQuickListViewAttached*>(attached)->m_sectionItem = s;
}
qreal position() const {
if (section()) {
if (view->orientation() == QQuickListView::Vertical)
return (view->verticalLayoutDirection() == QQuickItemView::BottomToTop ? -section()->height()-section()->y() : section()->y());
else
return (view->effectiveLayoutDirection() == Qt::RightToLeft ? -section()->width()-section()->x() : section()->x());
} else {
return itemPosition();
}
}
qreal itemPosition() const {
if (view->orientation() == QQuickListView::Vertical)
return (view->verticalLayoutDirection() == QQuickItemView::BottomToTop ? -item->height()-itemY() : itemY());
else
return (view->effectiveLayoutDirection() == Qt::RightToLeft ? -item->width()-itemX() : itemX());
281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350
}
qreal size() const {
if (section())
return (view->orientation() == QQuickListView::Vertical ? item->height()+section()->height() : item->width()+section()->width());
else
return (view->orientation() == QQuickListView::Vertical ? item->height() : item->width());
}
qreal itemSize() const {
return (view->orientation() == QQuickListView::Vertical ? item->height() : item->width());
}
qreal sectionSize() const {
if (section())
return (view->orientation() == QQuickListView::Vertical ? section()->height() : section()->width());
return 0.0;
}
qreal endPosition() const {
if (view->orientation() == QQuickListView::Vertical) {
return (view->verticalLayoutDirection() == QQuickItemView::BottomToTop
? -itemY()
: itemY() + item->height());
} else {
return (view->effectiveLayoutDirection() == Qt::RightToLeft
? -itemX()
: itemX() + item->width());
}
}
void setPosition(qreal pos, bool immediate = false) {
// position the section immediately even if there is a transition
if (section()) {
if (view->orientation() == QQuickListView::Vertical) {
if (view->verticalLayoutDirection() == QQuickItemView::BottomToTop)
section()->setY(-section()->height()-pos);
else
section()->setY(pos);
} else {
if (view->effectiveLayoutDirection() == Qt::RightToLeft)
section()->setX(-section()->width()-pos);
else
section()->setX(pos);
}
}
moveTo(pointForPosition(pos), immediate);
}
void setSize(qreal size) {
if (view->orientation() == QQuickListView::Vertical)
item->setHeight(size);
else
item->setWidth(size);
}
bool contains(qreal x, qreal y) const {
return (x >= itemX() && x < itemX() + item->width() &&
y >= itemY() && y < itemY() + item->height());
}
QQuickListView *view;
private:
QPointF pointForPosition(qreal pos) const {
if (view->orientation() == QQuickListView::Vertical) {
if (view->verticalLayoutDirection() == QQuickItemView::BottomToTop) {
if (section())
pos += section()->height();
return QPointF(itemX(), -item->height() - pos);
} else {
if (section())
pos += section()->height();
return QPointF(itemX(), pos);
}
} else {
if (view->effectiveLayoutDirection() == Qt::RightToLeft) {
351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420
if (section())
pos += section()->width();
return QPointF(-item->width() - pos, itemY());
} else {
if (section())
pos += section()->width();
return QPointF(pos, itemY());
}
}
}
};
//----------------------------------------------------------------------------
bool QQuickListViewPrivate::isContentFlowReversed() const
{
return isRightToLeft() || isBottomToTop();
}
Qt::Orientation QQuickListViewPrivate::layoutOrientation() const
{
return static_cast<Qt::Orientation>(orient);
}
bool QQuickListViewPrivate::isRightToLeft() const
{
Q_Q(const QQuickListView);
return orient == QQuickListView::Horizontal && q->effectiveLayoutDirection() == Qt::RightToLeft;
}
bool QQuickListViewPrivate::isBottomToTop() const
{
return orient == QQuickListView::Vertical && verticalLayoutDirection == QQuickItemView::BottomToTop;
}
// Returns the item before modelIndex, if created.
// May return an item marked for removal.
FxViewItem *QQuickListViewPrivate::itemBefore(int modelIndex) const
{
if (modelIndex < visibleIndex)
return 0;
int idx = 1;
int lastIndex = -1;
while (idx < visibleItems.count()) {
FxViewItem *item = visibleItems.at(idx);
if (item->index != -1)
lastIndex = item->index;
if (item->index == modelIndex)
return visibleItems.at(idx-1);
++idx;
}
if (lastIndex == modelIndex-1)
return visibleItems.last();
return 0;
}
void QQuickListViewPrivate::setPosition(qreal pos)
{
Q_Q(QQuickListView);
if (orient == QQuickListView::Vertical) {
if (isBottomToTop())
q->QQuickFlickable::setContentY(-pos-size());
else
q->QQuickFlickable::setContentY(pos);
} else {
if (isRightToLeft())
q->QQuickFlickable::setContentX(-pos-size());
else
q->QQuickFlickable::setContentX(pos);
}
421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490
}
qreal QQuickListViewPrivate::originPosition() const
{
qreal pos = 0;
if (!visibleItems.isEmpty()) {
pos = (*visibleItems.constBegin())->position();
if (visibleIndex > 0)
pos -= visibleIndex * (averageSize + spacing);
}
return pos;
}
qreal QQuickListViewPrivate::lastPosition() const
{
qreal pos = 0;
if (!visibleItems.isEmpty()) {
int invisibleCount = visibleItems.count() - visibleIndex;
for (int i = visibleItems.count()-1; i >= 0; --i) {
if (visibleItems.at(i)->index != -1) {
invisibleCount = model->count() - visibleItems.at(i)->index - 1;
break;
}
}
pos = (*(--visibleItems.constEnd()))->endPosition() + invisibleCount * (averageSize + spacing);
} else if (model && model->count()) {
pos = (model->count() * averageSize + (model->count()-1) * spacing);
}
return pos;
}
qreal QQuickListViewPrivate::positionAt(int modelIndex) const
{
if (FxViewItem *item = visibleItem(modelIndex)) {
return item->position();
}
if (!visibleItems.isEmpty()) {
if (modelIndex < visibleIndex) {
int count = visibleIndex - modelIndex;
qreal cs = 0;
if (modelIndex == currentIndex && currentItem) {
cs = currentItem->size() + spacing;
--count;
}
return (*visibleItems.constBegin())->position() - count * (averageSize + spacing) - cs;
} else {
int count = modelIndex - findLastVisibleIndex(visibleIndex) - 1;
return (*(--visibleItems.constEnd()))->endPosition() + spacing + count * (averageSize + spacing);
}
}
return 0;
}
qreal QQuickListViewPrivate::endPositionAt(int modelIndex) const
{
if (FxViewItem *item = visibleItem(modelIndex))
return item->endPosition();
if (!visibleItems.isEmpty()) {
if (modelIndex < visibleIndex) {
int count = visibleIndex - modelIndex;
return (*visibleItems.constBegin())->position() - (count - 1) * (averageSize + spacing) - spacing;
} else {
int count = modelIndex - findLastVisibleIndex(visibleIndex) - 1;
return (*(--visibleItems.constEnd()))->endPosition() + count * (averageSize + spacing);
}
}
return 0;
}
QString QQuickListViewPrivate::sectionAt(int modelIndex)
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{
if (FxViewItem *item = visibleItem(modelIndex))
return item->attached->section();
QString section;
if (sectionCriteria) {
QString propValue = model->stringValue(modelIndex, sectionCriteria->property());
section = sectionCriteria->sectionString(propValue);
}
return section;
}
qreal QQuickListViewPrivate::snapPosAt(qreal pos)
{
if (FxViewItem *snapItem = snapItemAt(pos))
return snapItem->position();
if (visibleItems.count()) {
qreal firstPos = (*visibleItems.constBegin())->position();
qreal endPos = (*(--visibleItems.constEnd()))->position();
if (pos < firstPos) {
return firstPos - qRound((firstPos - pos) / averageSize) * averageSize;
} else if (pos > endPos)
return endPos + qRound((pos - endPos) / averageSize) * averageSize;
}
return qRound((pos - originPosition()) / averageSize) * averageSize + originPosition();
}
FxViewItem *QQuickListViewPrivate::snapItemAt(qreal pos)
{
FxViewItem *snapItem = 0;
qreal prevItemSize = 0;
for (int i = 0; i < visibleItems.count(); ++i) {
FxViewItem *item = visibleItems.at(i);
if (item->index == -1)
continue;
qreal itemTop = item->position();
if (highlight && itemTop >= pos && item->endPosition() <= pos + highlight->size())
return item;
if (itemTop+item->size()/2 >= pos && itemTop-prevItemSize/2 < pos)
snapItem = item;
prevItemSize = item->size();
}
return snapItem;
}
void QQuickListViewPrivate::changedVisibleIndex(int newIndex)
{
visiblePos = positionAt(newIndex);
visibleIndex = newIndex;
}
void QQuickListViewPrivate::init()
{
QQuickItemViewPrivate::init();
::memset(sectionCache, 0, sizeof(QQuickItem*) * sectionCacheSize);
}
void QQuickListViewPrivate::clear()
{
for (int i = 0; i < sectionCacheSize; ++i) {
delete sectionCache[i];
sectionCache[i] = 0;
}
visiblePos = 0;
releaseSectionItem(currentSectionItem);
currentSectionItem = 0;
releaseSectionItem(nextSectionItem);
nextSectionItem = 0;
lastVisibleSection = QString();
561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630
QQuickItemViewPrivate::clear();
}
FxViewItem *QQuickListViewPrivate::newViewItem(int modelIndex, QQuickItem *item)
{
Q_Q(QQuickListView);
FxListItemSG *listItem = new FxListItemSG(item, q, false, false);
listItem->index = modelIndex;
// initialise attached properties
if (sectionCriteria) {
QString propValue = model->stringValue(modelIndex, sectionCriteria->property());
listItem->attached->m_section = sectionCriteria->sectionString(propValue);
if (modelIndex > 0) {
if (FxViewItem *item = itemBefore(modelIndex))
listItem->attached->m_prevSection = item->attached->section();
else
listItem->attached->m_prevSection = sectionAt(modelIndex-1);
}
if (modelIndex < model->count()-1) {
if (FxViewItem *item = visibleItem(modelIndex+1))
listItem->attached->m_nextSection = static_cast<QQuickListViewAttached*>(item->attached)->section();
else
listItem->attached->m_nextSection = sectionAt(modelIndex+1);
}
}
return listItem;
}
void QQuickListViewPrivate::initializeViewItem(FxViewItem *item)
{
QQuickItemViewPrivate::initializeViewItem(item);
QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item->item);
itemPrivate->addItemChangeListener(this, QQuickItemPrivate::Geometry);
if (sectionCriteria && sectionCriteria->delegate()) {
if (QString::compare(item->attached->m_prevSection, item->attached->m_section, Qt::CaseInsensitive))
updateInlineSection(static_cast<FxListItemSG*>(item));
}
}
bool QQuickListViewPrivate::releaseItem(FxViewItem *item)
{
if (!item || !model)
return true;
QQuickListViewAttached *att = static_cast<QQuickListViewAttached*>(item->attached);
bool released = QQuickItemViewPrivate::releaseItem(item);
if (released && att && att->m_sectionItem) {
// We hold no more references to this item
int i = 0;
do {
if (!sectionCache[i]) {
sectionCache[i] = att->m_sectionItem;
sectionCache[i]->setVisible(false);
att->m_sectionItem = 0;
break;
}
++i;
} while (i < sectionCacheSize);
delete att->m_sectionItem;
att->m_sectionItem = 0;
}
return released;
}
631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700
bool QQuickListViewPrivate::addVisibleItems(qreal fillFrom, qreal fillTo, bool doBuffer)
{
qreal itemEnd = visiblePos;
if (visibleItems.count()) {
visiblePos = (*visibleItems.constBegin())->position();
itemEnd = (*(--visibleItems.constEnd()))->endPosition() + spacing;
}
int modelIndex = findLastVisibleIndex();
bool haveValidItems = modelIndex >= 0;
modelIndex = modelIndex < 0 ? visibleIndex : modelIndex + 1;
if (haveValidItems && (fillFrom > itemEnd+averageSize+spacing
|| fillTo < visiblePos - averageSize - spacing)) {
// We've jumped more than a page. Estimate which items are now
// visible and fill from there.
int count = (fillFrom - itemEnd) / (averageSize + spacing);
int newModelIdx = qBound(0, modelIndex + count, model->count());
count = newModelIdx - modelIndex;
if (count) {
for (int i = 0; i < visibleItems.count(); ++i)
releaseItem(visibleItems.at(i));
visibleItems.clear();
modelIndex = newModelIdx;
visibleIndex = modelIndex;
visiblePos = itemEnd + count * (averageSize + spacing);
itemEnd = visiblePos;
}
}
bool changed = false;
FxListItemSG *item = 0;
qreal pos = itemEnd;
while (modelIndex < model->count() && pos <= fillTo) {
#ifdef DEBUG_DELEGATE_LIFECYCLE
qDebug() << "refill: append item" << modelIndex << "pos" << pos;
#endif
if (!(item = static_cast<FxListItemSG*>(createItem(modelIndex, doBuffer))))
break;
if (!transitioner || !transitioner->canTransition(QQuickItemViewTransitioner::PopulateTransition, true)) // pos will be set by layoutVisibleItems()
item->setPosition(pos, true);
item->item->setVisible(!doBuffer);
pos += item->size() + spacing;
visibleItems.append(item);
++modelIndex;
changed = true;
}
if (doBuffer && requestedIndex != -1) // already waiting for an item
return changed;
while (visibleIndex > 0 && visibleIndex <= model->count() && visiblePos > fillFrom) {
#ifdef DEBUG_DELEGATE_LIFECYCLE
qDebug() << "refill: prepend item" << visibleIndex-1 << "current top pos" << visiblePos;
#endif
if (!(item = static_cast<FxListItemSG*>(createItem(visibleIndex-1, doBuffer))))
break;
--visibleIndex;
visiblePos -= item->size() + spacing;
if (!transitioner || !transitioner->canTransition(QQuickItemViewTransitioner::PopulateTransition, true)) // pos will be set by layoutVisibleItems()
item->setPosition(visiblePos, true);
item->item->setVisible(!doBuffer);
visibleItems.prepend(item);
changed = true;
}
return changed;
}
701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770
bool QQuickListViewPrivate::removeNonVisibleItems(qreal bufferFrom, qreal bufferTo)
{
FxViewItem *item = 0;
bool changed = false;
// Remove items from the start of the view.
// Zero-sized items shouldn't be removed unless a non-zero-sized item is also being
// removed, otherwise a zero-sized item is infinitely added and removed over and
// over by refill().
int index = 0;
while (visibleItems.count() > 1 && index < visibleItems.count()
&& (item = visibleItems.at(index)) && item->endPosition() < bufferFrom) {
if (item->attached->delayRemove())
break;
if (item->size() > 0) {
#ifdef DEBUG_DELEGATE_LIFECYCLE
qDebug() << "refill: remove first" << visibleIndex << "top end pos" << item->endPosition();
#endif
// remove this item and all zero-sized items before it
while (item) {
if (item->index != -1)
visibleIndex++;
visibleItems.removeAt(index);
if (item->transitionScheduledOrRunning()) {
#ifdef DEBUG_DELEGATE_LIFECYCLE
qDebug() << "refill not releasing animating item" << item->index << item->item->objectName();
#endif
item->releaseAfterTransition = true;
releasePendingTransition.append(item);
} else {
releaseItem(item);
}
if (index == 0)
break;
item = visibleItems.at(--index);
}
changed = true;
} else {
index++;
}
}
while (visibleItems.count() > 1 && (item = visibleItems.last()) && item->position() > bufferTo) {
if (item->attached->delayRemove())
break;
#ifdef DEBUG_DELEGATE_LIFECYCLE
qDebug() << "refill: remove last" << visibleIndex+visibleItems.count()-1 << item->position();
#endif
visibleItems.removeLast();
if (item->transitionScheduledOrRunning()) {
#ifdef DEBUG_DELEGATE_LIFECYCLE
qDebug() << "refill not releasing animating item" << item->index << item->item->objectName();
#endif
item->releaseAfterTransition = true;
releasePendingTransition.append(item);
} else {
releaseItem(item);
}
changed = true;
}
return changed;
}
void QQuickListViewPrivate::visibleItemsChanged()
{
if (visibleItems.count())
visiblePos = (*visibleItems.constBegin())->position();
updateAverage();
771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840
if (currentIndex >= 0 && currentItem && !visibleItem(currentIndex)) {
static_cast<FxListItemSG*>(currentItem)->setPosition(positionAt(currentIndex));
updateHighlight();
}
if (sectionCriteria)
updateCurrentSection();
updateUnrequestedPositions();
}
void QQuickListViewPrivate::layoutVisibleItems(int fromModelIndex)
{
if (!visibleItems.isEmpty()) {
const qreal from = isContentFlowReversed() ? -position() - size() : position();
const qreal to = isContentFlowReversed() ? -position() : position() + size();
FxViewItem *firstItem = *visibleItems.constBegin();
bool fixedCurrent = currentItem && firstItem->item == currentItem->item;
qreal sum = firstItem->size();
qreal pos = firstItem->position() + firstItem->size() + spacing;
firstItem->item->setVisible(firstItem->endPosition() >= from && firstItem->position() <= to);
for (int i=1; i < visibleItems.count(); ++i) {
FxListItemSG *item = static_cast<FxListItemSG*>(visibleItems.at(i));
if (item->index >= fromModelIndex) {
item->setPosition(pos);
item->setVisible(item->endPosition() >= from && item->position() <= to);
}
pos += item->size() + spacing;
sum += item->size();
fixedCurrent = fixedCurrent || (currentItem && item->item == currentItem->item);
}
averageSize = qRound(sum / visibleItems.count());
// move current item if it is not a visible item.
if (currentIndex >= 0 && currentItem && !fixedCurrent)
static_cast<FxListItemSG*>(currentItem)->setPosition(positionAt(currentIndex));
}
}
void QQuickListViewPrivate::repositionItemAt(FxViewItem *item, int index, qreal sizeBuffer)
{
static_cast<FxListItemSG *>(item)->setPosition(positionAt(index) + sizeBuffer);
}
void QQuickListViewPrivate::repositionPackageItemAt(QQuickItem *item, int index)
{
Q_Q(QQuickListView);
qreal pos = position();
if (orient == QQuickListView::Vertical) {
if (item->y() + item->height() > pos && item->y() < pos + q->height()) {
if (isBottomToTop())
item->setY(-positionAt(index)-item->height());
else
item->setY(positionAt(index));
}
} else {
if (item->x() + item->width() > pos && item->x() < pos + q->width()) {
if (isRightToLeft())
item->setX(-positionAt(index)-item->width());
else
item->setX(positionAt(index));
}
}
}
void QQuickListViewPrivate::resetFirstItemPosition(qreal pos)
{
FxListItemSG *item = static_cast<FxListItemSG*>(visibleItems.first());
item->setPosition(pos);
}
841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910
void QQuickListViewPrivate::adjustFirstItem(qreal forwards, qreal backwards, int)
{
if (!visibleItems.count())
return;
qreal diff = forwards - backwards;
static_cast<FxListItemSG*>(visibleItems.first())->setPosition(visibleItems.first()->position() + diff);
}
void QQuickListViewPrivate::createHighlight()
{
Q_Q(QQuickListView);
bool changed = false;
if (highlight) {
if (trackedItem == highlight)
trackedItem = 0;
delete highlight;
highlight = 0;
delete highlightPosAnimator;
delete highlightSizeAnimator;
highlightPosAnimator = 0;
highlightSizeAnimator = 0;
changed = true;
}
if (currentItem) {
QQuickItem *item = createHighlightItem();
if (item) {
FxListItemSG *newHighlight = new FxListItemSG(item, q, true, true);
if (autoHighlight) {
newHighlight->setSize(static_cast<FxListItemSG*>(currentItem)->itemSize());
newHighlight->setPosition(static_cast<FxListItemSG*>(currentItem)->itemPosition());
}
const QLatin1String posProp(orient == QQuickListView::Vertical ? "y" : "x");
highlightPosAnimator = new QSmoothedAnimation;
highlightPosAnimator->target = QQmlProperty(item, posProp);
highlightPosAnimator->velocity = highlightMoveSpeed;
highlightPosAnimator->userDuration = highlightMoveDuration;
const QLatin1String sizeProp(orient == QQuickListView::Vertical ? "height" : "width");
highlightSizeAnimator = new QSmoothedAnimation;
highlightSizeAnimator->velocity = highlightResizeSpeed;
highlightSizeAnimator->userDuration = highlightResizeDuration;
highlightSizeAnimator->target = QQmlProperty(item, sizeProp);
highlight = newHighlight;
changed = true;
}
}
if (changed)
emit q->highlightItemChanged();
}
void QQuickListViewPrivate::updateHighlight()
{
applyPendingChanges();
if ((!currentItem && highlight) || (currentItem && !highlight))
createHighlight();
bool strictHighlight = haveHighlightRange && highlightRange == QQuickListView::StrictlyEnforceRange;
if (currentItem && autoHighlight && highlight && (!strictHighlight || !pressed)) {
// auto-update highlight
FxListItemSG *listItem = static_cast<FxListItemSG*>(currentItem);
highlightPosAnimator->to = isContentFlowReversed()
? -listItem->itemPosition()-listItem->itemSize()
: listItem->itemPosition();
highlightSizeAnimator->to = listItem->itemSize();
911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980
if (orient == QQuickListView::Vertical) {
if (highlight->item->width() == 0)
highlight->item->setWidth(currentItem->item->width());
} else {
if (highlight->item->height() == 0)
highlight->item->setHeight(currentItem->item->height());
}
highlightPosAnimator->restart();
highlightSizeAnimator->restart();
}
updateTrackedItem();
}
void QQuickListViewPrivate::resetHighlightPosition()
{
if (highlight && currentItem)
static_cast<FxListItemSG*>(highlight)->setPosition(static_cast<FxListItemSG*>(currentItem)->itemPosition());
}
QQuickItem * QQuickListViewPrivate::getSectionItem(const QString §ion)
{
Q_Q(QQuickListView);
QQuickItem *sectionItem = 0;
int i = sectionCacheSize-1;
while (i >= 0 && !sectionCache[i])
--i;
if (i >= 0) {
sectionItem = sectionCache[i];
sectionCache[i] = 0;
sectionItem->setVisible(true);
QQmlContext *context = QQmlEngine::contextForObject(sectionItem)->parentContext();
context->setContextProperty(QLatin1String("section"), section);
} else {
QQmlContext *creationContext = sectionCriteria->delegate()->creationContext();
QQmlContext *context = new QQmlContext(
creationContext ? creationContext : qmlContext(q));
context->setContextProperty(QLatin1String("section"), section);
QObject *nobj = sectionCriteria->delegate()->beginCreate(context);
if (nobj) {
QQml_setParent_noEvent(context, nobj);
sectionItem = qobject_cast<QQuickItem *>(nobj);
if (!sectionItem) {
delete nobj;
} else {
sectionItem->setZ(2);
QQml_setParent_noEvent(sectionItem, contentItem);
sectionItem->setParentItem(contentItem);
}
} else {
delete context;
}
sectionCriteria->delegate()->completeCreate();
}
return sectionItem;
}
void QQuickListViewPrivate::releaseSectionItem(QQuickItem *item)
{
if (!item)
return;
int i = 0;
do {
if (!sectionCache[i]) {
sectionCache[i] = item;
sectionCache[i]->setVisible(false);
return;
}
++i;
981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050
} while (i < sectionCacheSize);
delete item;
}
void QQuickListViewPrivate::updateInlineSection(FxListItemSG *listItem)
{
if (!sectionCriteria || !sectionCriteria->delegate())
return;
if (QString::compare(listItem->attached->m_prevSection, listItem->attached->m_section, Qt::CaseInsensitive)
&& (sectionCriteria->labelPositioning() & QQuickViewSection::InlineLabels
|| (listItem->index == 0 && sectionCriteria->labelPositioning() & QQuickViewSection::CurrentLabelAtStart))) {
if (!listItem->section()) {
qreal pos = listItem->position();
listItem->setSection(getSectionItem(listItem->attached->m_section));
listItem->setPosition(pos);
} else {
QQmlContext *context = QQmlEngine::contextForObject(listItem->section())->parentContext();
context->setContextProperty(QLatin1String("section"), listItem->attached->m_section);
}
} else if (listItem->section()) {
qreal pos = listItem->position();
releaseSectionItem(listItem->section());
listItem->setSection(0);
listItem->setPosition(pos);
}
}
void QQuickListViewPrivate::updateStickySections()
{
if (!sectionCriteria
|| (!sectionCriteria->labelPositioning() && !currentSectionItem && !nextSectionItem))
return;
bool isFlowReversed = isContentFlowReversed();
qreal viewPos = isFlowReversed ? -position()-size() : position();
QQuickItem *sectionItem = 0;
QQuickItem *lastSectionItem = 0;
int index = 0;
while (index < visibleItems.count()) {
if (QQuickItem *section = static_cast<FxListItemSG *>(visibleItems.at(index))->section()) {
// Find the current section header and last visible section header
// and hide them if they will overlap a static section header.
qreal sectionPos = orient == QQuickListView::Vertical ? section->y() : section->x();
qreal sectionSize = orient == QQuickListView::Vertical ? section->height() : section->width();
bool visTop = true;
if (sectionCriteria->labelPositioning() & QQuickViewSection::CurrentLabelAtStart)
visTop = isFlowReversed ? -sectionPos-sectionSize >= viewPos : sectionPos >= viewPos;
bool visBot = true;
if (sectionCriteria->labelPositioning() & QQuickViewSection::NextLabelAtEnd)
visBot = isFlowReversed ? -sectionPos <= viewPos + size() : sectionPos + sectionSize < viewPos + size();
section->setVisible(visBot && visTop);
if (visTop && !sectionItem)
sectionItem = section;
if (isFlowReversed) {
if (-sectionPos <= viewPos + size())
lastSectionItem = section;
} else {
if (sectionPos + sectionSize < viewPos + size())
lastSectionItem = section;
}
}
++index;
}
// Current section header
if (sectionCriteria->labelPositioning() & QQuickViewSection::CurrentLabelAtStart && isValid() && visibleItems.count()) {
if (!currentSectionItem) {
currentSectionItem = getSectionItem(currentSection);
} else if (QString::compare(currentStickySection, currentSection, Qt::CaseInsensitive)) {
QQmlContext *context = QQmlEngine::contextForObject(currentSectionItem)->parentContext();
1051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120
context->setContextProperty(QLatin1String("section"), currentSection);
}
currentStickySection = currentSection;
if (!currentSectionItem)
return;
qreal sectionSize = orient == QQuickListView::Vertical ? currentSectionItem->height() : currentSectionItem->width();
bool atBeginning = orient == QQuickListView::Vertical ? (isBottomToTop() ? vData.atEnd : vData.atBeginning) : (isRightToLeft() ? hData.atEnd : hData.atBeginning);
currentSectionItem->setVisible(!atBeginning && (!header || header->endPosition() < viewPos));
qreal pos = isFlowReversed ? position() + size() - sectionSize : viewPos;
if (sectionItem) {
qreal sectionPos = orient == QQuickListView::Vertical ? sectionItem->y() : sectionItem->x();
pos = isFlowReversed ? qMax(pos, sectionPos + sectionSize) : qMin(pos, sectionPos - sectionSize);
}
if (header)
pos = isFlowReversed ? qMin(header->endPosition(), pos) : qMax(header->endPosition(), pos);
if (footer)
pos = isFlowReversed ? qMax(-footer->position(), pos) : qMin(footer->position() - sectionSize, pos);
if (orient == QQuickListView::Vertical)
currentSectionItem->setY(pos);
else
currentSectionItem->setX(pos);
} else if (currentSectionItem) {
releaseSectionItem(currentSectionItem);
currentSectionItem = 0;
}
// Next section footer
if (sectionCriteria->labelPositioning() & QQuickViewSection::NextLabelAtEnd && isValid() && visibleItems.count()) {
if (!nextSectionItem) {
nextSectionItem = getSectionItem(nextSection);
} else if (QString::compare(nextStickySection, nextSection, Qt::CaseInsensitive)) {
QQmlContext *context = QQmlEngine::contextForObject(nextSectionItem)->parentContext();
context->setContextProperty(QLatin1String("section"), nextSection);
}
nextStickySection = nextSection;
if (!nextSectionItem)
return;
qreal sectionSize = orient == QQuickListView::Vertical ? nextSectionItem->height() : nextSectionItem->width();
nextSectionItem->setVisible(!nextSection.isEmpty());
qreal pos = isFlowReversed ? position() : viewPos + size() - sectionSize;
if (lastSectionItem) {
qreal sectionPos = orient == QQuickListView::Vertical ? lastSectionItem->y() : lastSectionItem->x();
pos = isFlowReversed ? qMin(pos, sectionPos - sectionSize) : qMax(pos, sectionPos + sectionSize);
}
if (header)
pos = isFlowReversed ? qMin(header->endPosition() - sectionSize, pos) : qMax(header->endPosition(), pos);
if (orient == QQuickListView::Vertical)
nextSectionItem->setY(pos);
else
nextSectionItem->setX(pos);
} else if (nextSectionItem) {
releaseSectionItem(nextSectionItem);
nextSectionItem = 0;
}
}
void QQuickListViewPrivate::updateSections()
{
Q_Q(QQuickListView);
if (!q->isComponentComplete())
return;
QQuickItemViewPrivate::updateSections();
if (sectionCriteria && !visibleItems.isEmpty() && isValid()) {
QString prevSection;
if (visibleIndex > 0)
1121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190
prevSection = sectionAt(visibleIndex-1);
QQuickListViewAttached *prevAtt = 0;
int idx = -1;
for (int i = 0; i < visibleItems.count(); ++i) {
QQuickListViewAttached *attached = static_cast<QQuickListViewAttached*>(visibleItems.at(i)->attached);
attached->setPrevSection(prevSection);
if (visibleItems.at(i)->index != -1) {
QString propValue = model->stringValue(visibleItems.at(i)->index, sectionCriteria->property());
attached->setSection(sectionCriteria->sectionString(propValue));
idx = visibleItems.at(i)->index;
}
updateInlineSection(static_cast<FxListItemSG*>(visibleItems.at(i)));
if (prevAtt)
prevAtt->setNextSection(attached->section());
prevSection = attached->section();
prevAtt = attached;
}
if (prevAtt) {
if (idx > 0 && idx < model->count()-1)
prevAtt->setNextSection(sectionAt(idx+1));
else
prevAtt->setNextSection(QString());
}
}
lastVisibleSection = QString();
updateCurrentSection();
updateStickySections();
}
void QQuickListViewPrivate::updateCurrentSection()
{
Q_Q(QQuickListView);
if (!sectionCriteria || visibleItems.isEmpty()) {
if (!currentSection.isEmpty()) {
currentSection.clear();
emit q->currentSectionChanged();
}
return;
}
bool inlineSections = sectionCriteria->labelPositioning() & QQuickViewSection::InlineLabels;
qreal sectionThreshold = position();
if (currentSectionItem && !inlineSections)
sectionThreshold += orient == QQuickListView::Vertical ? currentSectionItem->height() : currentSectionItem->width();
int index = 0;
int modelIndex = visibleIndex;
while (index < visibleItems.count() && visibleItems.at(index)->endPosition() <= sectionThreshold) {
if (visibleItems.at(index)->index != -1)
modelIndex = visibleItems.at(index)->index;
++index;
}
QString newSection = currentSection;
if (index < visibleItems.count())
newSection = visibleItems.at(index)->attached->section();
else
newSection = (*visibleItems.constBegin())->attached->section();
if (newSection != currentSection) {
currentSection = newSection;
updateStickySections();
emit q->currentSectionChanged();
}
if (sectionCriteria->labelPositioning() & QQuickViewSection::NextLabelAtEnd) {
// Don't want to scan for next section on every movement, so remember
// the last section in the visible area and only scan for the next
// section when that changes. Clearing lastVisibleSection will also
// force searching.
QString lastSection = currentSection;
qreal endPos = isContentFlowReversed() ? -position() : position() + size();
1191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260
if (nextSectionItem && !inlineSections)
endPos -= orient == QQuickListView::Vertical ? nextSectionItem->height() : nextSectionItem->width();
while (index < visibleItems.count() && static_cast<FxListItemSG*>(visibleItems.at(index))->itemPosition() < endPos) {
if (visibleItems.at(index)->index != -1)
modelIndex = visibleItems.at(index)->index;
lastSection = visibleItems.at(index)->attached->section();
++index;
}
if (lastVisibleSection != lastSection) {
nextSection = QString();
lastVisibleSection = lastSection;
for (int i = modelIndex; i < itemCount; ++i) {
QString section = sectionAt(i);
if (section != lastSection) {
nextSection = section;
updateStickySections();
break;
}
}
}
}
}
void QQuickListViewPrivate::initializeCurrentItem()
{
QQuickItemViewPrivate::initializeCurrentItem();
if (currentItem) {
FxListItemSG *listItem = static_cast<FxListItemSG *>(currentItem);
// don't reposition the item if it is already in the visibleItems list
FxViewItem *actualItem = visibleItem(currentIndex);
if (!actualItem) {
if (currentIndex == visibleIndex - 1 && visibleItems.count()) {
// We can calculate exact postion in this case
listItem->setPosition(visibleItems.first()->position() - currentItem->size() - spacing);
} else {
// Create current item now and position as best we can.
// Its position will be corrected when it becomes visible.
listItem->setPosition(positionAt(currentIndex));
}
}
if (visibleItems.isEmpty())
averageSize = listItem->size();
}
}
void QQuickListViewPrivate::updateAverage()
{
if (!visibleItems.count())
return;
qreal sum = 0.0;
for (int i = 0; i < visibleItems.count(); ++i)
sum += visibleItems.at(i)->size();
averageSize = qRound(sum / visibleItems.count());
}
qreal QQuickListViewPrivate::headerSize() const
{
return header ? header->size() : 0.0;
}
qreal QQuickListViewPrivate::footerSize() const
{
return footer ? footer->size() : 0.0;
}
bool QQuickListViewPrivate::showHeaderForIndex(int index) const
1261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306130713081309131013111312131313141315131613171318131913201321132213231324132513261327132813291330
{
return index == 0;
}
bool QQuickListViewPrivate::showFooterForIndex(int index) const
{
return index == model->count()-1;
}
void QQuickListViewPrivate::updateFooter()
{
Q_Q(QQuickListView);
bool created = false;
if (!footer) {
QQuickItem *item = createComponentItem(footerComponent, 1.0);
if (!item)
return;
footer = new FxListItemSG(item, q, true, true);
created = true;
}
FxListItemSG *listItem = static_cast<FxListItemSG*>(footer);
if (visibleItems.count()) {
qreal endPos = lastPosition();
if (findLastVisibleIndex() == model->count()-1) {
listItem->setPosition(endPos);
} else {
qreal visiblePos = position() + q->height();
if (endPos <= visiblePos || listItem->position() < endPos)
listItem->setPosition(endPos);
}
} else {
listItem->setPosition(visiblePos);
}
if (created)
emit q->footerItemChanged();
}
void QQuickListViewPrivate::updateHeader()
{
Q_Q(QQuickListView);
bool created = false;
if (!header) {
QQuickItem *item = createComponentItem(headerComponent, 1.0);
if (!item)
return;
header = new FxListItemSG(item, q, true, true);
created = true;
}
FxListItemSG *listItem = static_cast<FxListItemSG*>(header);
if (listItem) {
if (visibleItems.count()) {
qreal startPos = originPosition();
if (visibleIndex == 0) {
listItem->setPosition(startPos - headerSize());
} else {
if (position() <= startPos || listItem->position() > startPos - headerSize())
listItem->setPosition(startPos - headerSize());
}
} else {
listItem->setPosition(-headerSize());
}
}
if (created)
emit q->headerItemChanged();
}
1331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400
void QQuickListViewPrivate::itemGeometryChanged(QQuickItem *item, const QRectF &newGeometry, const QRectF &oldGeometry)
{
Q_Q(QQuickListView);
QQuickItemViewPrivate::itemGeometryChanged(item, newGeometry, oldGeometry);
if (!q->isComponentComplete())
return;
if (item != contentItem && (!highlight || item != highlight->item)) {
if ((orient == QQuickListView::Vertical && newGeometry.height() != oldGeometry.height())
|| (orient == QQuickListView::Horizontal && newGeometry.width() != oldGeometry.width())) {
// if visibleItems.first() has resized, adjust its pos since it is used to
// position all subsequent items
if (visibleItems.count() && item == visibleItems.first()->item) {
FxListItemSG *listItem = static_cast<FxListItemSG*>(visibleItems.first());
if (orient == QQuickListView::Vertical) {
qreal diff = newGeometry.height() - oldGeometry.height();
if (verticalLayoutDirection == QQuickListView::TopToBottom && listItem->endPosition() < q->contentY())
listItem->setPosition(listItem->position() - diff, true);
else if (verticalLayoutDirection == QQuickListView::BottomToTop && listItem->endPosition() > q->contentY())
listItem->setPosition(listItem->position() + diff, true);
} else {
qreal diff = newGeometry.width() - oldGeometry.width();
if (q->effectiveLayoutDirection() == Qt::LeftToRight && listItem->endPosition() < q->contentX())
listItem->setPosition(listItem->position() - diff, true);
else if (q->effectiveLayoutDirection() == Qt::RightToLeft && listItem->endPosition() > q->contentX())
listItem->setPosition(listItem->position() + diff, true);
}
}
forceLayout = true;
q->polish();
}
}
}
void QQuickListViewPrivate::fixupPosition()
{
if ((haveHighlightRange && highlightRange == QQuickListView::StrictlyEnforceRange)
|| snapMode != QQuickListView::NoSnap)
moveReason = Other;
if (orient == QQuickListView::Vertical)
fixupY();
else
fixupX();
}
void QQuickListViewPrivate::fixup(AxisData &data, qreal minExtent, qreal maxExtent)
{
if ((orient == QQuickListView::Horizontal && &data == &vData)
|| (orient == QQuickListView::Vertical && &data == &hData))
return;
correctFlick = false;
fixupMode = moveReason == Mouse ? fixupMode : Immediate;
bool strictHighlightRange = haveHighlightRange && highlightRange == QQuickListView::StrictlyEnforceRange;
qreal viewPos = isContentFlowReversed() ? -position()-size() : position();
if (snapMode != QQuickListView::NoSnap && moveReason != QQuickListViewPrivate::SetIndex) {
qreal tempPosition = isContentFlowReversed() ? -position()-size() : position();
if (snapMode == QQuickListView::SnapOneItem && moveReason == Mouse) {
// if we've been dragged < averageSize/2 then bias towards the next item
qreal dist = data.move.value() - (data.pressPos - data.dragStartOffset);
qreal bias = 0;
if (data.velocity > 0 && dist > QML_FLICK_SNAPONETHRESHOLD && dist < averageSize/2)
bias = averageSize/2;
else if (data.velocity < 0 && dist < -QML_FLICK_SNAPONETHRESHOLD && dist > -averageSize/2)
bias = -averageSize/2;
if (isContentFlowReversed())
bias = -bias;
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tempPosition -= bias;
}
FxViewItem *topItem = snapItemAt(tempPosition+highlightRangeStart);
if (!topItem && strictHighlightRange && currentItem) {
// StrictlyEnforceRange always keeps an item in range
updateHighlight();
topItem = currentItem;
}
FxViewItem *bottomItem = snapItemAt(tempPosition+highlightRangeEnd);
if (!bottomItem && strictHighlightRange && currentItem) {
// StrictlyEnforceRange always keeps an item in range
updateHighlight();
bottomItem = currentItem;
}
qreal pos;
bool isInBounds = -position() > maxExtent && -position() <= minExtent;
if (topItem && (isInBounds || strictHighlightRange)) {
if (topItem->index == 0 && header && tempPosition+highlightRangeStart < header->position()+header->size()/2 && !strictHighlightRange) {
pos = isContentFlowReversed() ? - header->position() + highlightRangeStart - size() : header->position() - highlightRangeStart;
} else {
if (isContentFlowReversed())
pos = qMax(qMin(-topItem->position() + highlightRangeStart - size(), -maxExtent), -minExtent);
else
pos = qMax(qMin(topItem->position() - highlightRangeStart, -maxExtent), -minExtent);
}
} else if (bottomItem && isInBounds) {
if (isContentFlowReversed())
pos = qMax(qMin(-bottomItem->position() + highlightRangeEnd - size(), -maxExtent), -minExtent);
else
pos = qMax(qMin(bottomItem->position() - highlightRangeEnd, -maxExtent), -minExtent);
} else {
QQuickItemViewPrivate::fixup(data, minExtent, maxExtent);
return;
}
qreal dist = qAbs(data.move + pos);
if (dist > 0) {
timeline.reset(data.move);
if (fixupMode != Immediate) {
timeline.move(data.move, -pos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2);
data.fixingUp = true;
} else {
timeline.set(data.move, -pos);
}
vTime = timeline.time();
}
} else if (currentItem && strictHighlightRange && moveReason != QQuickListViewPrivate::SetIndex) {
updateHighlight();
qreal pos = static_cast<FxListItemSG*>(currentItem)->itemPosition();
if (viewPos < pos + static_cast<FxListItemSG*>(currentItem)->itemSize() - highlightRangeEnd)
viewPos = pos + static_cast<FxListItemSG*>(currentItem)->itemSize() - highlightRangeEnd;
if (viewPos > pos - highlightRangeStart)
viewPos = pos - highlightRangeStart;
if (isContentFlowReversed())
viewPos = -viewPos-size();
timeline.reset(data.move);
if (viewPos != position()) {
if (fixupMode != Immediate) {
timeline.move(data.move, -viewPos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2);
data.fixingUp = true;
} else {
timeline.set(data.move, -viewPos);
}
}
vTime = timeline.time();
} else {
QQuickItemViewPrivate::fixup(data, minExtent, maxExtent);
}
data.inOvershoot = false;
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fixupMode = Normal;
}
void QQuickListViewPrivate::flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize,
QQuickTimeLineCallback::Callback fixupCallback, qreal velocity)
{
Q_Q(QQuickListView);
data.fixingUp = false;
moveReason = Mouse;
if ((!haveHighlightRange || highlightRange != QQuickListView::StrictlyEnforceRange) && snapMode == QQuickListView::NoSnap) {
correctFlick = true;
QQuickItemViewPrivate::flick(data, minExtent, maxExtent, vSize, fixupCallback, velocity);
return;
}
qreal maxDistance = 0;
qreal dataValue = isContentFlowReversed() ? -data.move.value()+size() : data.move.value();
// -ve velocity means list is moving up/left
if (velocity > 0) {
if (data.move.value() < minExtent) {
if (snapMode == QQuickListView::SnapOneItem && !hData.flicking && !vData.flicking) {
// if we've been dragged < averageSize/2 then bias towards the next item
qreal dist = data.move.value() - (data.pressPos - data.dragStartOffset);
qreal bias = dist < averageSize/2 ? averageSize/2 : 0;
if (isContentFlowReversed())
bias = -bias;
data.flickTarget = -snapPosAt(-(dataValue - highlightRangeStart) - bias) + highlightRangeStart;
maxDistance = qAbs(data.flickTarget - data.move.value());
velocity = maxVelocity;
} else {
maxDistance = qAbs(minExtent - data.move.value());
}
}
if (snapMode == QQuickListView::NoSnap && highlightRange != QQuickListView::StrictlyEnforceRange)
data.flickTarget = minExtent;
} else {
if (data.move.value() > maxExtent) {
if (snapMode == QQuickListView::SnapOneItem && !hData.flicking && !vData.flicking) {
// if we've been dragged < averageSize/2 then bias towards the next item
qreal dist = data.move.value() - (data.pressPos - data.dragStartOffset);
qreal bias = -dist < averageSize/2 ? averageSize/2 : 0;
if (isContentFlowReversed())
bias = -bias;
data.flickTarget = -snapPosAt(-(dataValue - highlightRangeStart) + bias) + highlightRangeStart;
maxDistance = qAbs(data.flickTarget - data.move.value());
velocity = -maxVelocity;
} else {
maxDistance = qAbs(maxExtent - data.move.value());
}
}
if (snapMode == QQuickListView::NoSnap && highlightRange != QQuickListView::StrictlyEnforceRange)
data.flickTarget = maxExtent;
}
bool overShoot = boundsBehavior == QQuickFlickable::DragAndOvershootBounds;
if (maxDistance > 0 || overShoot) {
// These modes require the list to stop exactly on an item boundary.
// The initial flick will estimate the boundary to stop on.
// Since list items can have variable sizes, the boundary will be
// reevaluated and adjusted as we approach the boundary.
qreal v = velocity;
if (maxVelocity != -1 && maxVelocity < qAbs(v)) {
if (v < 0)
v = -maxVelocity;
else
v = maxVelocity;
}
if (!hData.flicking && !vData.flicking) {
// the initial flick - estimate boundary
qreal accel = deceleration;
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qreal v2 = v * v;
overshootDist = 0.0;
// + averageSize/4 to encourage moving at least one item in the flick direction
qreal dist = v2 / (accel * 2.0) + averageSize/4;
if (maxDistance > 0)
dist = qMin(dist, maxDistance);
if (v > 0)
dist = -dist;
if ((maxDistance > 0.0 && v2 / (2.0f * maxDistance) < accel) || snapMode == QQuickListView::SnapOneItem) {
if (snapMode != QQuickListView::SnapOneItem) {
qreal distTemp = isContentFlowReversed() ? -dist : dist;
data.flickTarget = -snapPosAt(-(dataValue - highlightRangeStart) + distTemp) + highlightRangeStart;
}
data.flickTarget = isContentFlowReversed() ? -data.flickTarget+size() : data.flickTarget;
if (overShoot) {
if (data.flickTarget >= minExtent) {
overshootDist = overShootDistance(vSize);
data.flickTarget += overshootDist;
} else if (data.flickTarget <= maxExtent) {
overshootDist = overShootDistance(vSize);
data.flickTarget -= overshootDist;
}
}
qreal adjDist = -data.flickTarget + data.move.value();
if (qAbs(adjDist) > qAbs(dist)) {
// Prevent painfully slow flicking - adjust velocity to suit flickDeceleration
qreal adjv2 = accel * 2.0f * qAbs(adjDist);
if (adjv2 > v2) {
v2 = adjv2;
v = qSqrt(v2);
if (dist > 0)
v = -v;
}
}
dist = adjDist;
accel = v2 / (2.0f * qAbs(dist));
} else if (overShoot) {
data.flickTarget = data.move.value() - dist;
if (data.flickTarget >= minExtent) {
overshootDist = overShootDistance(vSize);
data.flickTarget += overshootDist;
} else if (data.flickTarget <= maxExtent) {
overshootDist = overShootDistance(vSize);
data.flickTarget -= overshootDist;
}
}
timeline.reset(data.move);
timeline.accel(data.move, v, accel, maxDistance + overshootDist);
timeline.callback(QQuickTimeLineCallback(&data.move, fixupCallback, this));
if (!hData.flicking && q->xflick()) {
hData.flicking = true;
emit q->flickingChanged();
emit q->flickingHorizontallyChanged();
emit q->flickStarted();
}
if (!vData.flicking && q->yflick()) {
vData.flicking = true;
emit q->flickingChanged();
emit q->flickingVerticallyChanged();
emit q->flickStarted();
}
correctFlick = true;
} else {
// reevaluate the target boundary.
qreal newtarget = data.flickTarget;
if (snapMode != QQuickListView::NoSnap || highlightRange == QQuickListView::StrictlyEnforceRange) {
qreal tempFlickTarget = isContentFlowReversed() ? -data.flickTarget+size() : data.flickTarget;
newtarget = -snapPosAt(-(tempFlickTarget - highlightRangeStart)) + highlightRangeStart;
newtarget = isContentFlowReversed() ? -newtarget+size() : newtarget;
}
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if (velocity < 0 && newtarget <= maxExtent)
newtarget = maxExtent - overshootDist;
else if (velocity > 0 && newtarget >= minExtent)
newtarget = minExtent + overshootDist;
if (newtarget == data.flickTarget) { // boundary unchanged - nothing to do
if (qAbs(velocity) < MinimumFlickVelocity)
correctFlick = false;
return;
}
data.flickTarget = newtarget;
qreal dist = -newtarget + data.move.value();
if ((v < 0 && dist < 0) || (v > 0 && dist > 0)) {
correctFlick = false;
timeline.reset(data.move);
fixup(data, minExtent, maxExtent);
return;
}
timeline.reset(data.move);
timeline.accelDistance(data.move, v, -dist);
timeline.callback(QQuickTimeLineCallback(&data.move, fixupCallback, this));
}
} else {
correctFlick = false;
timeline.reset(data.move);
fixup(data, minExtent, maxExtent);
}
}
//----------------------------------------------------------------------------
/*!
\qmlclass ListView QQuickListView
\inqmlmodule QtQuick 2
\ingroup qml-view-elements
\inherits Flickable
\brief Provides a list view of items provided by a model
A ListView displays data from models created from built-in QML elements like ListModel
and XmlListModel, or custom model classes defined in C++ that inherit from
QAbstractListModel.
A ListView has a \l model, which defines the data to be displayed, and
a \l delegate, which defines how the data should be displayed. Items in a
ListView are laid out horizontally or vertically. List views are inherently
flickable because ListView inherits from \l Flickable.
\section1 Example Usage
The following example shows the definition of a simple list model defined
in a file called \c ContactModel.qml:
\snippet qml/listview/ContactModel.qml 0
Another component can display this model data in a ListView, like this:
\snippet qml/listview/listview.qml import
\codeline
\snippet qml/listview/listview.qml classdocs simple
\image listview-simple.png
Here, the ListView creates a \c ContactModel component for its model, and a \l Text element
for its delegate. The view will create a new \l Text component for each item in the model. Notice
the delegate is able to access the model's \c name and \c number data directly.
An improved list view is shown below. The delegate is visually improved and is moved
into a separate \c contactDelegate component.
\snippet qml/listview/listview.qml classdocs advanced
\image listview-highlight.png
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The currently selected item is highlighted with a blue \l Rectangle using the \l highlight property,
and \c focus is set to \c true to enable keyboard navigation for the list view.
The list view itself is a focus scope (see \l{qmlfocus#Acquiring Focus and Focus Scopes}{the focus documentation page} for more details).
Delegates are instantiated as needed and may be destroyed at any time.
State should \e never be stored in a delegate.
ListView attaches a number of properties to the root item of the delegate, for example
\c {ListView.isCurrentItem}. In the following example, the root delegate item can access
this attached property directly as \c ListView.isCurrentItem, while the child
\c contactInfo object must refer to this property as \c wrapper.ListView.isCurrentItem.
\snippet qml/listview/listview.qml isCurrentItem
\note Views do not enable \e clip automatically. If the view
is not clipped by another item or the screen, it will be necessary
to set \e {clip: true} in order to have the out of view items clipped
nicely.
\section1 ListView layouts
The layout of the items in a ListView can be controlled by these properties:
\list
\li \l orientation - controls whether items flow horizontally or vertically.
This value can be either Qt.Horizontal or Qt.Vertical.
\li \l layoutDirection - controls the horizontal layout direction for a
horizontally-oriented view: that is, whether items are laid out from the left side of
the view to the right, or vice-versa. This value can be either Qt.LeftToRight or Qt.RightToLeft.
\li \l verticalLayoutDirection - controls the vertical layout direction for a vertically-oriented
view: that is, whether items are laid out from the top of the view down towards the bottom of
the view, or vice-versa. This value can be either ListView.TopToBottom or ListView.BottomToTop.
\endlist
By default, a ListView has a vertical orientation, and items are laid out from top to bottom. The
table below shows the different layouts that a ListView can have, depending on the values of
the properties listed above.
\table
\header
\li {2, 1}
\bold ListViews with Qt.Vertical orientation
\row
\li Top to bottom
\image listview-layout-toptobottom.png
\li Bottom to top
\image listview-layout-bottomtotop.png
\header
\li {2, 1}
\bold ListViews with Qt.Horizontal orientation
\row
\li Left to right
\image listview-layout-lefttoright.png
\li Right to left
\image listview-layout-righttoleft.png
\endtable
\sa {QML Data Models}, GridView, {declarative/modelviews/listview}{ListView examples}
*/
QQuickListView::QQuickListView(QQuickItem *parent)
: QQuickItemView(*(new QQuickListViewPrivate), parent)
{
}
QQuickListView::~QQuickListView()
{
}
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/*!
\qmlattachedproperty bool QtQuick2::ListView::isCurrentItem
This attached property is true if this delegate is the current item; otherwise false.
It is attached to each instance of the delegate.
This property may be used to adjust the appearance of the current item, for example:
\snippet qml/listview/listview.qml isCurrentItem
*/
/*!
\qmlattachedproperty ListView QtQuick2::ListView::view
This attached property holds the view that manages this delegate instance.
It is attached to each instance of the delegate.
*/
/*!
\qmlattachedproperty string QtQuick2::ListView::previousSection
This attached property holds the section of the previous element.
It is attached to each instance of the delegate.
The section is evaluated using the \l {ListView::section.property}{section} properties.
*/
/*!
\qmlattachedproperty string QtQuick2::ListView::nextSection
This attached property holds the section of the next element.
It is attached to each instance of the delegate.
The section is evaluated using the \l {ListView::section.property}{section} properties.
*/
/*!
\qmlattachedproperty string QtQuick2::ListView::section
This attached property holds the section of this element.
It is attached to each instance of the delegate.
The section is evaluated using the \l {ListView::section.property}{section} properties.
*/
/*!
\qmlattachedproperty bool QtQuick2::ListView::delayRemove
This attached property holds whether the delegate may be destroyed. It
is attached to each instance of the delegate. The default value is false.
It is sometimes necessary to delay the destruction of an item
until an animation completes. The example delegate below ensures that the
animation completes before the item is removed from the list.
\snippet qml/listview/listview.qml delayRemove
If a \l remove transition has been specified, it will not be applied until
delayRemove is returned to \c false.
*/
/*!
\qmlattachedsignal QtQuick2::ListView::onAdd()
This attached signal handler is called immediately after an item is added to the view.
If an \l add transition is specified, it is applied immediately after
this signal handler is called.
*/
/*!
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\qmlattachedsignal QtQuick2::ListView::onRemove()
This attached handler is called immediately before an item is removed from the view.
If a \l remove transition has been specified, it is applied after
this signal handler is called, providing that delayRemove is false.
*/
/*!
\qmlproperty model QtQuick2::ListView::model
This property holds the model providing data for the list.
The model provides the set of data that is used to create the items
in the view. Models can be created directly in QML using \l ListModel, \l XmlListModel
or \l VisualItemModel, or provided by C++ model classes. If a C++ model class is
used, it must be a subclass of \l QAbstractItemModel or a simple list.
\sa {qmlmodels}{Data Models}
*/
/*!
\qmlproperty Component QtQuick2::ListView::delegate
The delegate provides a template defining each item instantiated by the view.
The index is exposed as an accessible \c index property. Properties of the
model are also available depending upon the type of \l {qmlmodels}{Data Model}.
The number of elements in the delegate has a direct effect on the
flicking performance of the view. If at all possible, place functionality
that is not needed for the normal display of the delegate in a \l Loader which
can load additional elements when needed.
The ListView will lay out the items based on the size of the root item
in the delegate.
It is recommended that the delegate's size be a whole number to avoid sub-pixel
alignment of items.
\note Delegates are instantiated as needed and may be destroyed at any time.
State should \e never be stored in a delegate.
*/
/*!
\qmlproperty int QtQuick2::ListView::currentIndex
\qmlproperty Item QtQuick2::ListView::currentItem
The \c currentIndex property holds the index of the current item, and
\c currentItem holds the current item. Setting the currentIndex to -1
will clear the highlight and set currentItem to null.
If highlightFollowsCurrentItem is \c true, setting either of these
properties will smoothly scroll the ListView so that the current
item becomes visible.
Note that the position of the current item
may only be approximate until it becomes visible in the view.
*/
/*!
\qmlproperty Item QtQuick2::ListView::highlightItem
This holds the highlight item created from the \l highlight component.
The \c highlightItem is managed by the view unless
\l highlightFollowsCurrentItem is set to false.
\sa highlight, highlightFollowsCurrentItem
*/
/*!
\qmlproperty int QtQuick2::ListView::count
This property holds the number of items in the view.
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*/
/*!
\qmlproperty Component QtQuick2::ListView::highlight
This property holds the component to use as the highlight.
An instance of the highlight component is created for each list.
The geometry of the resulting component instance is managed by the list
so as to stay with the current item, unless the highlightFollowsCurrentItem
property is false.
\sa highlightItem, highlightFollowsCurrentItem, {declarative/modelviews/listview}{ListView examples}
*/
/*!
\qmlproperty bool QtQuick2::ListView::highlightFollowsCurrentItem
This property holds whether the highlight is managed by the view.
If this property is true (the default value), the highlight is moved smoothly
to follow the current item. Otherwise, the
highlight is not moved by the view, and any movement must be implemented
by the highlight.
Here is a highlight with its motion defined by a \l {SpringAnimation} item:
\snippet qml/listview/listview.qml highlightFollowsCurrentItem
Note that the highlight animation also affects the way that the view
is scrolled. This is because the view moves to maintain the
highlight within the preferred highlight range (or visible viewport).
\sa highlight, highlightMoveSpeed
*/
//###Possibly rename these properties, since they are very useful even without a highlight?
/*!
\qmlproperty real QtQuick2::ListView::preferredHighlightBegin
\qmlproperty real QtQuick2::ListView::preferredHighlightEnd
\qmlproperty enumeration QtQuick2::ListView::highlightRangeMode
These properties define the preferred range of the highlight (for the current item)
within the view. The \c preferredHighlightBegin value must be less than the
\c preferredHighlightEnd value.
These properties affect the position of the current item when the list is scrolled.
For example, if the currently selected item should stay in the middle of the
list when the view is scrolled, set the \c preferredHighlightBegin and
\c preferredHighlightEnd values to the top and bottom coordinates of where the middle
item would be. If the \c currentItem is changed programmatically, the list will
automatically scroll so that the current item is in the middle of the view.
Furthermore, the behavior of the current item index will occur whether or not a
highlight exists.
Valid values for \c highlightRangeMode are:
\list
\li ListView.ApplyRange - the view attempts to maintain the highlight within the range.
However, the highlight can move outside of the range at the ends of the list or due
to mouse interaction.
\li ListView.StrictlyEnforceRange - the highlight never moves outside of the range.
The current item changes if a keyboard or mouse action would cause the highlight to move
outside of the range.
\li ListView.NoHighlightRange - this is the default value.
\endlist
*/
void QQuickListView::setHighlightFollowsCurrentItem(bool autoHighlight)
{
Q_D(QQuickListView);
if (d->autoHighlight != autoHighlight) {
if (!autoHighlight) {
if (d->highlightPosAnimator)
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d->highlightPosAnimator->stop();
if (d->highlightSizeAnimator)
d->highlightSizeAnimator->stop();
}
QQuickItemView::setHighlightFollowsCurrentItem(autoHighlight);
}
}
/*!
\qmlproperty real QtQuick2::ListView::spacing
This property holds the spacing between items.
The default value is 0.
*/
qreal QQuickListView::spacing() const
{
Q_D(const QQuickListView);
return d->spacing;
}
void QQuickListView::setSpacing(qreal spacing)
{
Q_D(QQuickListView);
if (spacing != d->spacing) {
d->spacing = spacing;
d->forceLayout = true;
polish();
emit spacingChanged();
}
}
/*!
\qmlproperty enumeration QtQuick2::ListView::orientation
This property holds the orientation of the list.
Possible values:
\list
\li ListView.Horizontal - Items are laid out horizontally
\li ListView.Vertical (default) - Items are laid out vertically
\endlist
\table
\row
\li Horizontal orientation:
\image ListViewHorizontal.png
\row
\li Vertical orientation:
\image listview-highlight.png
\endtable
*/
QQuickListView::Orientation QQuickListView::orientation() const
{
Q_D(const QQuickListView);
return d->orient;
}
void QQuickListView::setOrientation(QQuickListView::Orientation orientation)
{
Q_D(QQuickListView);
if (d->orient != orientation) {
d->orient = orientation;
if (d->orient == Vertical) {
setContentWidth(-1);
setFlickableDirection(VerticalFlick);
setContentX(0);
} else {
setContentHeight(-1);
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setFlickableDirection(HorizontalFlick);
setContentY(0);
}
d->regenerate();
emit orientationChanged();
}
}
/*!
\qmlproperty enumeration QtQuick2::ListView::layoutDirection
This property holds the layout direction of a horizontally-oriented list.
Possible values:
\list
\li Qt.LeftToRight (default) - Items will be laid out from left to right.
\li Qt.RightToLeft - Items will be laid out from right to let.
\endlist
Setting this property has no effect if the \l orientation is Qt.Vertical.
\sa ListView::effectiveLayoutDirection, ListView::verticalLayoutDirection
*/
/*!
\qmlproperty enumeration QtQuick2::ListView::effectiveLayoutDirection
This property holds the effective layout direction of a horizontally-oriented list.
When using the attached property \l {LayoutMirroring::enabled}{LayoutMirroring::enabled} for locale layouts,
the visual layout direction of the horizontal list will be mirrored. However, the
property \l {ListView::layoutDirection}{layoutDirection} will remain unchanged.
\sa ListView::layoutDirection, {LayoutMirroring}{LayoutMirroring}
*/
/*!
\qmlproperty enumeration QtQuick2::ListView::verticalLayoutDirection
This property holds the layout direction of a vertically-oriented list.
Possible values:
\list
\li ListView.TopToBottom (default) - Items are laid out from the top of the view down to the bottom of the view.
\li ListView.BottomToTop - Items are laid out from the bottom of the view up to the top of the view.
\endlist
Setting this property has no effect if the \l orientation is Qt.Horizontal.
\sa ListView::layoutDirection
*/
/*!
\qmlproperty bool QtQuick2::ListView::keyNavigationWraps
This property holds whether the list wraps key navigation.
If this is true, key navigation that would move the current item selection
past the end of the list instead wraps around and moves the selection to
the start of the list, and vice-versa.
By default, key navigation is not wrapped.
*/
/*!
\qmlproperty int QtQuick2::ListView::cacheBuffer
This property determines whether delegates are retained outside the
visible area of the view.
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If this value is non-zero, the view may keep as many delegates
instantiated as it can fit within the buffer specified. For example,
if in a vertical view the delegate is 20 pixels high and \c cacheBuffer is
set to 40, then up to 2 delegates above and 2 delegates below the visible
area may be created/retained. The buffered delegates are created asynchronously,
allowing creation to occur across multiple frames and reducing the
likelihood of skipping frames. In order to improve painting performance
delegates outside the visible area have their \l visible property set to
false until they are moved into the visible area.
Note that cacheBuffer is not a pixel buffer - it only maintains additional
instantiated delegates.
Setting this value can improve the smoothness of scrolling behavior at the expense
of additional memory usage. It is not a substitute for creating efficient
delegates; the fewer elements in a delegate, the faster a view can be
scrolled.
*/
/*!
\qmlproperty string QtQuick2::ListView::section.property
\qmlproperty enumeration QtQuick2::ListView::section.criteria
\qmlproperty Component QtQuick2::ListView::section.delegate
\qmlproperty enumeration QtQuick2::ListView::section.labelPositioning
These properties determine the expression to be evaluated and appearance
of the section labels.
\c section.property holds the name of the property that is the basis
of each section.
\c section.criteria holds the criteria for forming each section based on
\c section.property. This value can be one of:
\list
\li ViewSection.FullString (default) - sections are created based on the
\c section.property value.
\li ViewSection.FirstCharacter - sections are created based on the first
character of the \c section.property value (for example, 'A', 'B', 'C'
sections, etc. for an address book)
\endlist
A case insensitive comparison is used when determining section
boundaries.
\c section.delegate holds the delegate component for each section.
\c section.labelPositioning determines whether the current and/or
next section labels stick to the start/end of the view, and whether
the labels are shown inline. This value can be a combination of:
\list
\li ViewSection.InlineLabels - section labels are shown inline between
the item delegates separating sections (default).
\li ViewSection.CurrentLabelAtStart - the current section label sticks to the
start of the view as it is moved.
\li ViewSection.NextLabelAtEnd - the next section label (beyond all visible
sections) sticks to the end of the view as it is moved. \note Enabling
\c ViewSection.NextLabelAtEnd requires the view to scan ahead for the next
section, which has performance implications, especially for slower models.
\endlist
Each item in the list has attached properties named \c ListView.section,
\c ListView.previousSection and \c ListView.nextSection.
For example, here is a ListView that displays a list of animals, separated
into sections. Each item in the ListView is placed in a different section
depending on the "size" property of the model item. The \c sectionHeading
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delegate component provides the light blue bar that marks the beginning of
each section.
\snippet examples/quick/modelviews/listview/sections.qml 0
\image qml-listview-sections-example.png
\note Adding sections to a ListView does not automatically re-order the
list items by the section criteria.
If the model is not ordered by section, then it is possible that
the sections created will not be unique; each boundary between
differing sections will result in a section header being created
even if that section exists elsewhere.
\sa {declarative/modelviews/listview}{ListView examples}
*/
QQuickViewSection *QQuickListView::sectionCriteria()
{
Q_D(QQuickListView);
if (!d->sectionCriteria) {
d->sectionCriteria = new QQuickViewSection(this);
connect(d->sectionCriteria, SIGNAL(propertyChanged()), this, SLOT(updateSections()));
}
return d->sectionCriteria;
}
/*!
\qmlproperty string QtQuick2::ListView::currentSection
This property holds the section that is currently at the beginning of the view.
*/
QString QQuickListView::currentSection() const
{
Q_D(const QQuickListView);
return d->currentSection;
}
/*!
\qmlproperty real QtQuick2::ListView::highlightMoveSpeed
\qmlproperty int QtQuick2::ListView::highlightMoveDuration
\qmlproperty real QtQuick2::ListView::highlightResizeSpeed
\qmlproperty int QtQuick2::ListView::highlightResizeDuration
These properties hold the move and resize animation speed of the highlight delegate.
\l highlightFollowsCurrentItem must be true for these properties
to have effect.
The default value for the speed properties is 400 pixels/second.
The default value for the duration properties is -1, i.e. the
highlight will take as much time as necessary to move at the set speed.
These properties have the same characteristics as a SmoothedAnimation.
\sa highlightFollowsCurrentItem
*/
qreal QQuickListView::highlightMoveSpeed() const
{
Q_D(const QQuickListView);
return d->highlightMoveSpeed;
}
void QQuickListView::setHighlightMoveSpeed(qreal speed)
{
Q_D(QQuickListView);
if (d->highlightMoveSpeed != speed) {
d->highlightMoveSpeed = speed;
if (d->highlightPosAnimator)
d->highlightPosAnimator->velocity = d->highlightMoveSpeed;
emit highlightMoveSpeedChanged();
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}
}
void QQuickListView::setHighlightMoveDuration(int duration)
{
Q_D(QQuickListView);
if (d->highlightMoveDuration != duration) {
if (d->highlightPosAnimator)
d->highlightPosAnimator->userDuration = duration;
QQuickItemView::setHighlightMoveDuration(duration);
}
}
qreal QQuickListView::highlightResizeSpeed() const
{
Q_D(const QQuickListView);
return d->highlightResizeSpeed;
}
void QQuickListView::setHighlightResizeSpeed(qreal speed)
{
Q_D(QQuickListView);
if (d->highlightResizeSpeed != speed) {
d->highlightResizeSpeed = speed;
if (d->highlightSizeAnimator)
d->highlightSizeAnimator->velocity = d->highlightResizeSpeed;
emit highlightResizeSpeedChanged();
}
}
int QQuickListView::highlightResizeDuration() const
{
Q_D(const QQuickListView);
return d->highlightResizeDuration;
}
void QQuickListView::setHighlightResizeDuration(int duration)
{
Q_D(QQuickListView);
if (d->highlightResizeDuration != duration) {
d->highlightResizeDuration = duration;
if (d->highlightSizeAnimator)
d->highlightSizeAnimator->userDuration = d->highlightResizeDuration;
emit highlightResizeDurationChanged();
}
}
/*!
\qmlproperty enumeration QtQuick2::ListView::snapMode
This property determines how the view scrolling will settle following a drag or flick.
The possible values are:
\list
\li ListView.NoSnap (default) - the view stops anywhere within the visible area.
\li ListView.SnapToItem - the view settles with an item aligned with the start of
the view.
\li ListView.SnapOneItem - the view settles no more than one item away from the first
visible item at the time the mouse button is released. This mode is particularly
useful for moving one page at a time.
\endlist
\c snapMode does not affect the \l currentIndex. To update the
\l currentIndex as the list is moved, set \l highlightRangeMode
to \c ListView.StrictlyEnforceRange.
\sa highlightRangeMode
*/
QQuickListView::SnapMode QQuickListView::snapMode() const
{
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Q_D(const QQuickListView);
return d->snapMode;
}
void QQuickListView::setSnapMode(SnapMode mode)
{
Q_D(QQuickListView);
if (d->snapMode != mode) {
d->snapMode = mode;
emit snapModeChanged();
}
}
/*!
\qmlproperty Component QtQuick2::ListView::footer
This property holds the component to use as the footer.
An instance of the footer component is created for each view. The
footer is positioned at the end of the view, after any items.
\sa header, footerItem
*/
/*!
\qmlproperty Component QtQuick2::ListView::header
This property holds the component to use as the header.
An instance of the header component is created for each view. The
header is positioned at the beginning of the view, before any items.
\sa footer, headertem
*/
/*!
\qmlproperty Item QtQuick2::ListView::headerItem
This holds the header item created from the \l header component.
An instance of the header component is created for each view. The
header is positioned at the beginning of the view, before any items.
\sa header, footerItem
*/
/*!
\qmlproperty Item QtQuick2::ListView::footerItem
This holds the footer item created from the \l footer component.
An instance of the footer component is created for each view. The
footer is positioned at the end of the view, after any items.
\sa footer, headerItem
*/
/*!
\qmlproperty Transition QtQuick2::ListView::populate
This property holds the transition to apply to the items that are initially created
for a view.
It is applied to all items that are created when:
\list
\li The view is first created
\li The view's \l model changes
\li The view's \l model is \l {QAbstractItemModel::reset}{reset}, if the model is a QAbstractItemModel subclass
\endlist
For example, here is a view that specifies such a transition:
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\code
ListView {
...
populate: Transition {
NumberAnimation { properties: "x,y"; duration: 1000 }
}
}
\endcode
When the view is initialized, the view will create all the necessary items for the view,
then animate them to their correct positions within the view over one second.
For more details and examples on how to use view transitions, see the ViewTransition
documentation.
\sa add, ViewTransition
*/
/*!
\qmlproperty Transition QtQuick2::ListView::add
This property holds the transition to apply to items that are added to the view.
For example, here is a view that specifies such a transition:
\code
ListView {
...
add: Transition {
NumberAnimation { properties: "x,y"; from: 100; duration: 1000 }
}
}
\endcode
Whenever an item is added to the above view, the item will be animated from the position (100,100)
to its final x,y position within the view, over one second. The transition only applies to
the new items that are added to the view; it does not apply to the items below that are
displaced by the addition of the new items. To animate the displaced items, set the \l displaced
or \l addDisplaced properties.
For more details and examples on how to use view transitions, see the ViewTransition
documentation.
\note This transition is not applied to the items that are created when the view is initially
populated, or when the view's \l model changes. In those cases, the \l populate transition is
applied instead.
\sa addDisplaced, populate, ViewTransition
*/
/*!
\qmlproperty Transition QtQuick2::ListView::addDisplaced
This property holds the transition to apply to items within the view that are displaced by
the addition of other items to the view.
For example, here is a view that specifies such a transition:
\code
ListView {
...
addDisplaced: Transition {
NumberAnimation { properties: "x,y"; duration: 1000 }
}
}
\endcode
Whenever an item is added to the above view, all items beneath the new item are displaced, causing
them to move down (or sideways, if horizontally orientated) within the view. As this
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displacement occurs, the items' movement to their new x,y positions within the view will be
animated by a NumberAnimation over one second, as specified. This transition is not applied to
the new item that has been added to the view; to animate the added items, set the \l add
property.
If an item is displaced by multiple types of operations at the same time, it is not defined as to
whether the addDisplaced, moveDisplaced or removeDisplaced transition will be applied. Additionally,
if it is not necessary to specify different transitions depending on whether an item is displaced
by an add, move or remove operation, consider setting the \l displaced property instead.
For more details and examples on how to use view transitions, see the ViewTransition
documentation.
\note This transition is not applied to the items that are created when the view is initially
populated, or when the view's \l model changes. In those cases, the \l populate transition is
applied instead.
\sa displaced, add, populate, ViewTransition
*/
/*!
\qmlproperty Transition QtQuick2::ListView::move
This property holds the transition to apply to items in the view that are being moved due
to a move operation in the view's \l model.
For example, here is a view that specifies such a transition:
\code
ListView {
...
move: Transition {
NumberAnimation { properties: "x,y"; duration: 1000 }
}
}
\endcode
Whenever the \l model performs a move operation to move a particular set of indexes, the
respective items in the view will be animated to their new positions in the view over one
second. The transition only applies to the items that are the subject of the move operation
in the model; it does not apply to items below them that are displaced by the move operation.
To animate the displaced items, set the \l displaced or \l moveDisplaced properties.
For more details and examples on how to use view transitions, see the ViewTransition
documentation.
\sa moveDisplaced, ViewTransition
*/
/*!
\qmlproperty Transition QtQuick2::ListView::moveDisplaced
This property holds the transition to apply to items that are displaced by a move operation in
the view's \l model.
For example, here is a view that specifies such a transition:
\code
ListView {
...
moveDisplaced: Transition {
NumberAnimation { properties: "x,y"; duration: 1000 }
}
}
\endcode
Whenever the \l model performs a move operation to move a particular set of indexes, the items
between the source and destination indexes of the move operation are displaced, causing them
to move upwards or downwards (or sideways, if horizontally orientated) within the view. As this
displacement occurs, the items' movement to their new x,y positions within the view will be
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animated by a NumberAnimation over one second, as specified. This transition is not applied to
the items that are the actual subjects of the move operation; to animate the moved items, set
the \l move property.
If an item is displaced by multiple types of operations at the same time, it is not defined as to
whether the addDisplaced, moveDisplaced or removeDisplaced transition will be applied. Additionally,
if it is not necessary to specify different transitions depending on whether an item is displaced
by an add, move or remove operation, consider setting the \l displaced property instead.
For more details and examples on how to use view transitions, see the ViewTransition
documentation.
\sa displaced, move, ViewTransition
*/
/*!
\qmlproperty Transition QtQuick2::ListView::remove
This property holds the transition to apply to items that are removed from the view.
For example, here is a view that specifies such a transition:
\code
ListView {
...
remove: Transition {
ParallelAnimation {
NumberAnimation { property: "opacity"; to: 0; duration: 1000 }
NumberAnimation { properties: "x,y"; to: 100; duration: 1000 }
}
}
}
\endcode
Whenever an item is removed from the above view, the item will be animated to the position (100,100)
over one second, and in parallel will also change its opacity to 0. The transition
only applies to the items that are removed from the view; it does not apply to the items below
them that are displaced by the removal of the items. To animate the displaced items, set the
\l displaced or \l removeDisplaced properties.
Note that by the time the transition is applied, the item has already been removed from the
model; any references to the model data for the removed index will not be valid.
Additionally, if the \l delayRemove attached property has been set for a delegate item, the
remove transition will not be applied until \l delayRemove becomes false again.
For more details and examples on how to use view transitions, see the ViewTransition
documentation.
\sa removeDisplaced, ViewTransition
*/
/*!
\qmlproperty Transition QtQuick2::ListView::removeDisplaced
This property holds the transition to apply to items in the view that are displaced by the
removal of other items in the view.
For example, here is a view that specifies such a transition:
\code
ListView {
...
removeDisplaced: Transition {
NumberAnimation { properties: "x,y"; duration: 1000 }
}
}
\endcode
Whenever an item is removed from the above view, all items beneath it are displaced, causing
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them to move upwards (or sideways, if horizontally orientated) within the view. As this
displacement occurs, the items' movement to their new x,y positions within the view will be
animated by a NumberAnimation over one second, as specified. This transition is not applied to
the item that has actually been removed from the view; to animate the removed items, set the
\l remove property.
If an item is displaced by multiple types of operations at the same time, it is not defined as to
whether the addDisplaced, moveDisplaced or removeDisplaced transition will be applied. Additionally,
if it is not necessary to specify different transitions depending on whether an item is displaced
by an add, move or remove operation, consider setting the \l displaced property instead.
For more details and examples on how to use view transitions, see the ViewTransition
documentation.
\sa displaced, remove, ViewTransition
*/
/*!
\qmlproperty Transition QtQuick2::ListView::displaced
This property holds the generic transition to apply to items that have been displaced by
any model operation that affects the view.
This is a convenience for specifying the generic transition to be applied to any items
that are displaced by an add, move or remove operation, without having to specify the
individual addDisplaced, moveDisplaced and removeDisplaced properties. For example, here
is a view that specifies a displaced transition:
\code
ListView {
...
displaced: Transition {
NumberAnimation { properties: "x,y"; duration: 1000 }
}
}
\endcode
When any item is added, moved or removed within the above view, the items below it are
displaced, causing them to move down (or sideways, if horizontally orientated) within the
view. As this displacement occurs, the items' movement to their new x,y positions within
the view will be animated by a NumberAnimation over one second, as specified.
If a view specifies this generic displaced transition as well as a specific addDisplaced,
moveDisplaced or removeDisplaced transition, the more specific transition will be used
instead of the generic displaced transition when the relevant operation occurs, providing that
the more specific transition has not been disabled (by setting \l {Transition::enabled}{enabled}
to false). If it has indeed been disabled, the generic displaced transition is applied instead.
For more details and examples on how to use view transitions, see the ViewTransition
documentation.
\sa addDisplaced, moveDisplaced, removeDisplaced, ViewTransition
*/
void QQuickListView::viewportMoved()
{
Q_D(QQuickListView);
QQuickItemView::viewportMoved();
if (!d->itemCount)
return;
// Recursion can occur due to refill changing the content size.
if (d->inViewportMoved)
return;
d->inViewportMoved = true;
if (yflick()) {
if (d->isBottomToTop())
d->bufferMode = d->vData.smoothVelocity < 0 ? QQuickListViewPrivate::BufferAfter : QQuickListViewPrivate::BufferBefore;
else
d->bufferMode = d->vData.smoothVelocity < 0 ? QQuickListViewPrivate::BufferBefore : QQuickListViewPrivate::BufferAfter;
} else {
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if (d->isRightToLeft())
d->bufferMode = d->hData.smoothVelocity < 0 ? QQuickListViewPrivate::BufferAfter : QQuickListViewPrivate::BufferBefore;
else
d->bufferMode = d->hData.smoothVelocity < 0 ? QQuickListViewPrivate::BufferBefore : QQuickListViewPrivate::BufferAfter;
}
d->refillOrLayout();
// Set visibility of items to eliminate cost of items outside the visible area.
qreal from = d->isContentFlowReversed() ? -d->position()-d->size() : d->position();
qreal to = d->isContentFlowReversed() ? -d->position() : d->position()+d->size();
for (int i = 0; i < d->visibleItems.count(); ++i) {
FxViewItem *item = static_cast<FxListItemSG*>(d->visibleItems.at(i));
item->item->setVisible(item->endPosition() >= from && item->position() <= to);
}
if (d->currentItem)
d->currentItem->item->setVisible(d->currentItem->endPosition() >= from && d->currentItem->position() <= to);
if (d->hData.flicking || d->vData.flicking || d->hData.moving || d->vData.moving)
d->moveReason = QQuickListViewPrivate::Mouse;
if (d->moveReason != QQuickListViewPrivate::SetIndex) {
if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange && d->highlight) {
// reposition highlight
qreal pos = d->highlight->position();
qreal viewPos = d->isContentFlowReversed() ? -d->position()-d->size() : d->position();
if (pos > viewPos + d->highlightRangeEnd - d->highlight->size())
pos = viewPos + d->highlightRangeEnd - d->highlight->size();
if (pos < viewPos + d->highlightRangeStart)
pos = viewPos + d->highlightRangeStart;
if (pos != d->highlight->position()) {
d->highlightPosAnimator->stop();
static_cast<FxListItemSG*>(d->highlight)->setPosition(pos);
} else {
d->updateHighlight();
}
// update current index
if (FxViewItem *snapItem = d->snapItemAt(d->highlight->position())) {
if (snapItem->index >= 0 && snapItem->index != d->currentIndex)
d->updateCurrent(snapItem->index);
}
}
}
if ((d->hData.flicking || d->vData.flicking) && d->correctFlick && !d->inFlickCorrection) {
d->inFlickCorrection = true;
// Near an end and it seems that the extent has changed?
// Recalculate the flick so that we don't end up in an odd position.
if (yflick() && !d->vData.inOvershoot) {
if (d->vData.velocity > 0) {
const qreal minY = minYExtent();
if ((minY - d->vData.move.value() < height()/2 || d->vData.flickTarget - d->vData.move.value() < height()/2)
&& minY != d->vData.flickTarget)
d->flickY(-d->vData.smoothVelocity.value());
} else if (d->vData.velocity < 0) {
const qreal maxY = maxYExtent();
if ((d->vData.move.value() - maxY < height()/2 || d->vData.move.value() - d->vData.flickTarget < height()/2)
&& maxY != d->vData.flickTarget)
d->flickY(-d->vData.smoothVelocity.value());
}
}
if (xflick() && !d->hData.inOvershoot) {
if (d->hData.velocity > 0) {
const qreal minX = minXExtent();
if ((minX - d->hData.move.value() < width()/2 || d->hData.flickTarget - d->hData.move.value() < width()/2)
&& minX != d->hData.flickTarget)
d->flickX(-d->hData.smoothVelocity.value());
} else if (d->hData.velocity < 0) {
const qreal maxX = maxXExtent();
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if ((d->hData.move.value() - maxX < width()/2 || d->hData.move.value() - d->hData.flickTarget < width()/2)
&& maxX != d->hData.flickTarget)
d->flickX(-d->hData.smoothVelocity.value());
}
}
d->inFlickCorrection = false;
}
if (d->sectionCriteria) {
d->updateCurrentSection();
d->updateStickySections();
}
d->inViewportMoved = false;
}
void QQuickListView::keyPressEvent(QKeyEvent *event)
{
Q_D(QQuickListView);
if (d->model && d->model->count() && d->interactive) {
if ((d->orient == QQuickListView::Horizontal && !d->isRightToLeft() && event->key() == Qt::Key_Left)
|| (d->orient == QQuickListView::Horizontal && d->isRightToLeft() && event->key() == Qt::Key_Right)
|| (d->orient == QQuickListView::Vertical && !d->isBottomToTop() && event->key() == Qt::Key_Up)
|| (d->orient == QQuickListView::Vertical && d->isBottomToTop() && event->key() == Qt::Key_Down)) {
if (currentIndex() > 0 || (d->wrap && !event->isAutoRepeat())) {
decrementCurrentIndex();
event->accept();
return;
} else if (d->wrap) {
event->accept();
return;
}
} else if ((d->orient == QQuickListView::Horizontal && !d->isRightToLeft() && event->key() == Qt::Key_Right)
|| (d->orient == QQuickListView::Horizontal && d->isRightToLeft() && event->key() == Qt::Key_Left)
|| (d->orient == QQuickListView::Vertical && !d->isBottomToTop() && event->key() == Qt::Key_Down)
|| (d->orient == QQuickListView::Vertical && d->isBottomToTop() && event->key() == Qt::Key_Up)) {
if (currentIndex() < d->model->count() - 1 || (d->wrap && !event->isAutoRepeat())) {
incrementCurrentIndex();
event->accept();
return;
} else if (d->wrap) {
event->accept();
return;
}
}
}
event->ignore();
QQuickItemView::keyPressEvent(event);
}
void QQuickListView::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
Q_D(QQuickListView);
if (d->isRightToLeft()) {
// maintain position relative to the right edge
int dx = newGeometry.width() - oldGeometry.width();
setContentX(contentX() - dx);
} else if (d->isBottomToTop()) {
// maintain position relative to the bottom edge
int dy = newGeometry.height() - oldGeometry.height();
setContentY(contentY() - dy);
}
QQuickItemView::geometryChanged(newGeometry, oldGeometry);
}
/*!
\qmlmethod QtQuick2::ListView::incrementCurrentIndex()
Increments the current index. The current index will wrap
if keyNavigationWraps is true and it is currently at the end.
This method has no effect if the \l count is zero.
2801280228032804280528062807280828092810281128122813281428152816281728182819282028212822282328242825282628272828282928302831283228332834283528362837283828392840284128422843284428452846284728482849285028512852285328542855285628572858285928602861286228632864286528662867286828692870
\b Note: methods should only be called after the Component has completed.
*/
void QQuickListView::incrementCurrentIndex()
{
Q_D(QQuickListView);
int count = d->model ? d->model->count() : 0;
if (count && (currentIndex() < count - 1 || d->wrap)) {
d->moveReason = QQuickListViewPrivate::SetIndex;
int index = currentIndex()+1;
setCurrentIndex((index >= 0 && index < count) ? index : 0);
}
}
/*!
\qmlmethod QtQuick2::ListView::decrementCurrentIndex()
Decrements the current index. The current index will wrap
if keyNavigationWraps is true and it is currently at the beginning.
This method has no effect if the \l count is zero.
\b Note: methods should only be called after the Component has completed.
*/
void QQuickListView::decrementCurrentIndex()
{
Q_D(QQuickListView);
int count = d->model ? d->model->count() : 0;
if (count && (currentIndex() > 0 || d->wrap)) {
d->moveReason = QQuickListViewPrivate::SetIndex;
int index = currentIndex()-1;
setCurrentIndex((index >= 0 && index < count) ? index : count-1);
}
}
void QQuickListView::updateSections()
{
Q_D(QQuickListView);
if (isComponentComplete() && d->model) {
QList<QByteArray> roles;
if (d->sectionCriteria && !d->sectionCriteria->property().isEmpty())
roles << d->sectionCriteria->property().toUtf8();
d->model->setWatchedRoles(roles);
d->updateSections();
if (d->itemCount) {
d->forceLayout = true;
polish();
}
}
}
bool QQuickListViewPrivate::applyInsertionChange(const QQuickChangeSet::Insert &change, ChangeResult *insertResult, QList<FxViewItem *> *addedItems, QList<MovedItem> *movingIntoView)
{
int modelIndex = change.index;
int count = change.count;
qreal tempPos = isContentFlowReversed() ? -position()-size() : position();
int index = visibleItems.count() ? mapFromModel(modelIndex) : 0;
if (index < 0) {
int i = visibleItems.count() - 1;
while (i > 0 && visibleItems.at(i)->index == -1)
--i;
if (i == 0 && visibleItems.first()->index == -1) {
// there are no visible items except items marked for removal
index = visibleItems.count();
} else if (visibleItems.at(i)->index + 1 == modelIndex
&& visibleItems.at(i)->endPosition() <= buffer+tempPos+size()) {
// Special case of appending an item to the model.
index = visibleItems.count();
} else {
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if (modelIndex < visibleIndex) {
// Insert before visible items
visibleIndex += count;
for (int i = 0; i < visibleItems.count(); ++i) {
FxViewItem *item = visibleItems.at(i);
if (item->index != -1 && item->index >= modelIndex)
item->index += count;
}
}
return true;
}
}
// index can be the next item past the end of the visible items list (i.e. appended)
int pos = 0;
if (visibleItems.count()) {
pos = index < visibleItems.count() ? visibleItems.at(index)->position()
: visibleItems.last()->endPosition()+spacing;
}
int prevVisibleCount = visibleItems.count();
if (insertResult->visiblePos.isValid() && pos < insertResult->visiblePos) {
// Insert items before the visible item.
int insertionIdx = index;
int i = 0;
int from = tempPos - buffer;
for (i = count-1; i >= 0; --i) {
if (pos > from && insertionIdx < visibleIndex) {
// item won't be visible, just note the size for repositioning
insertResult->sizeChangesBeforeVisiblePos += averageSize + spacing;
pos -= averageSize + spacing;
} else {
// item is before first visible e.g. in cache buffer
FxViewItem *item = 0;
if (change.isMove() && (item = currentChanges.removedItems.take(change.moveKey(modelIndex + i))))
item->index = modelIndex + i;
if (!item)
item = createItem(modelIndex + i);
if (!item)
return false;
visibleItems.insert(insertionIdx, item);
if (insertionIdx == 0)
insertResult->changedFirstItem = true;
if (!change.isMove()) {
addedItems->append(item);
item->transitionNextReposition(transitioner, QQuickItemViewTransitioner::AddTransition, true);
}
insertResult->sizeChangesBeforeVisiblePos += item->size() + spacing;
pos -= item->size() + spacing;
}
index++;
}
} else {
int i = 0;
int to = buffer+tempPos+size();
for (i = 0; i < count && pos <= to; ++i) {
FxViewItem *item = 0;
if (change.isMove() && (item = currentChanges.removedItems.take(change.moveKey(modelIndex + i))))
item->index = modelIndex + i;
bool newItem = !item;
if (!item)
item = createItem(modelIndex + i);
if (!item)
return false;
visibleItems.insert(index, item);
if (index == 0)
insertResult->changedFirstItem = true;
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if (change.isMove()) {
// we know this is a move target, since move displaced items that are
// shuffled into view due to a move would be added in refill()
if (newItem && transitioner && transitioner->canTransition(QQuickItemViewTransitioner::MoveTransition, true))
movingIntoView->append(MovedItem(item, change.moveKey(item->index)));
} else {
addedItems->append(item);
item->transitionNextReposition(transitioner, QQuickItemViewTransitioner::AddTransition, true);
}
insertResult->sizeChangesAfterVisiblePos += item->size() + spacing;
pos += item->size() + spacing;
++index;
}
}
for (; index < visibleItems.count(); ++index) {
FxViewItem *item = visibleItems.at(index);
if (item->index != -1) {
item->index += count;
if (change.isMove())
item->transitionNextReposition(transitioner, QQuickItemViewTransitioner::MoveTransition, false);
else
item->transitionNextReposition(transitioner, QQuickItemViewTransitioner::AddTransition, false);
}
}
updateVisibleIndex();
return visibleItems.count() > prevVisibleCount;
}
void QQuickListViewPrivate::translateAndTransitionItemsAfter(int afterModelIndex, const ChangeResult &insertionResult, const ChangeResult &removalResult)
{
Q_UNUSED(insertionResult);
if (!transitioner)
return;
int markerItemIndex = -1;
for (int i=0; i<visibleItems.count(); i++) {
if (visibleItems[i]->index == afterModelIndex) {
markerItemIndex = i;
break;
}
}
if (markerItemIndex < 0)
return;
const qreal viewEndPos = isContentFlowReversed() ? -position() : position() + size();
qreal sizeRemoved = -removalResult.sizeChangesAfterVisiblePos
- (removalResult.countChangeAfterVisibleItems * (averageSize + spacing));
for (int i=markerItemIndex+1; i<visibleItems.count() && visibleItems.at(i)->position() < viewEndPos; i++) {
FxListItemSG *listItem = static_cast<FxListItemSG *>(visibleItems[i]);
if (!listItem->transitionScheduledOrRunning()) {
qreal pos = listItem->position();
listItem->setPosition(pos - sizeRemoved);
listItem->transitionNextReposition(transitioner, QQuickItemViewTransitioner::RemoveTransition, false);
listItem->setPosition(pos);
}
}
}
/*!
\qmlmethod QtQuick2::ListView::positionViewAtIndex(int index, PositionMode mode)
Positions the view such that the \a index is at the position specified by
\a mode:
\list
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\li ListView.Beginning - position item at the top (or left for horizontal orientation) of the view.
\li ListView.Center - position item in the center of the view.
\li ListView.End - position item at bottom (or right for horizontal orientation) of the view.
\li ListView.Visible - if any part of the item is visible then take no action, otherwise
bring the item into view.
\li ListView.Contain - ensure the entire item is visible. If the item is larger than
the view the item is positioned at the top (or left for horizontal orientation) of the view.
\endlist
If positioning the view at \a index would cause empty space to be displayed at
the beginning or end of the view, the view will be positioned at the boundary.
It is not recommended to use \l {Flickable::}{contentX} or \l {Flickable::}{contentY} to position the view
at a particular index. This is unreliable since removing items from the start
of the list does not cause all other items to be repositioned, and because
the actual start of the view can vary based on the size of the delegates.
The correct way to bring an item into view is with \c positionViewAtIndex.
\b Note: methods should only be called after the Component has completed. To position
the view at startup, this method should be called by Component.onCompleted. For
example, to position the view at the end:
\code
Component.onCompleted: positionViewAtIndex(count - 1, ListView.Beginning)
\endcode
*/
/*!
\qmlmethod QtQuick2::ListView::positionViewAtBeginning()
\qmlmethod QtQuick2::ListView::positionViewAtEnd()
Positions the view at the beginning or end, taking into account any header or footer.
It is not recommended to use \l {Flickable::}{contentX} or \l {Flickable::}{contentY} to position the view
at a particular index. This is unreliable since removing items from the start
of the list does not cause all other items to be repositioned, and because
the actual start of the view can vary based on the size of the delegates.
\b Note: methods should only be called after the Component has completed. To position
the view at startup, this method should be called by Component.onCompleted. For
example, to position the view at the end on startup:
\code
Component.onCompleted: positionViewAtEnd()
\endcode
*/
/*!
\qmlmethod int QtQuick2::ListView::indexAt(int x, int y)
Returns the index of the visible item containing the point \a x, \a y in content
coordinates. If there is no item at the point specified, or the item is
not visible -1 is returned.
If the item is outside the visible area, -1 is returned, regardless of
whether an item will exist at that point when scrolled into view.
\b Note: methods should only be called after the Component has completed.
*/
/*!
\qmlmethod Item QtQuick2::ListView::itemAt(int x, int y)
Returns the visible item containing the point \a x, \a y in content
coordinates. If there is no item at the point specified, or the item is
not visible null is returned.
If the item is outside the visible area, null is returned, regardless of
whether an item will exist at that point when scrolled into view.
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\b Note: methods should only be called after the Component has completed.
*/
QQuickListViewAttached *QQuickListView::qmlAttachedProperties(QObject *obj)
{
return new QQuickListViewAttached(obj);
}
QT_END_NAMESPACE