diff -r b72c6db6890b -r 5dc02b23752f src/declarative/graphicsitems/qdeclarativelistview.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/declarative/graphicsitems/qdeclarativelistview.cpp Tue Jul 06 15:10:48 2010 +0300 @@ -0,0 +1,2924 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "private/qdeclarativelistview_p.h" + +#include "private/qdeclarativeflickable_p_p.h" +#include "private/qdeclarativevisualitemmodel_p.h" + +#include "private/qdeclarativesmoothedanimation_p_p.h" +#include +#include +#include +#include + +#include +#include +#include + +QT_BEGIN_NAMESPACE + +void QDeclarativeViewSection::setProperty(const QString &property) +{ + if (property != m_property) { + m_property = property; + emit changed(); + } +} + +void QDeclarativeViewSection::setCriteria(QDeclarativeViewSection::SectionCriteria criteria) +{ + if (criteria != m_criteria) { + m_criteria = criteria; + emit changed(); + } +} + +void QDeclarativeViewSection::setDelegate(QDeclarativeComponent *delegate) +{ + if (delegate != m_delegate) { + m_delegate = delegate; + emit delegateChanged(); + } +} + +QString QDeclarativeViewSection::sectionString(const QString &value) +{ + if (m_criteria == FirstCharacter) + return value.isEmpty() ? QString() : value.at(0); + else + return value; +} + +//---------------------------------------------------------------------------- + +class FxListItem +{ +public: + FxListItem(QDeclarativeItem *i, QDeclarativeListView *v) : item(i), section(0), view(v) { + attached = static_cast(qmlAttachedPropertiesObject(item)); + if (attached) + attached->m_view = view; + } + ~FxListItem() {} + qreal position() const { + if (section) + return (view->orientation() == QDeclarativeListView::Vertical ? section->y() : section->x()); + else + return (view->orientation() == QDeclarativeListView::Vertical ? item->y() : item->x()); + } + int size() const { + if (section) + return (view->orientation() == QDeclarativeListView::Vertical ? item->height()+section->height() : item->width()+section->height()); + else + return (view->orientation() == QDeclarativeListView::Vertical ? item->height() : item->width()); + } + qreal endPosition() const { + return (view->orientation() == QDeclarativeListView::Vertical + ? item->y() + (item->height() > 0 ? item->height() : 1) + : item->x() + (item->width() > 0 ? item->width() : 1)) - 1; + } + void setPosition(qreal pos) { + if (view->orientation() == QDeclarativeListView::Vertical) { + if (section) { + section->setY(pos); + pos += section->height(); + } + item->setY(pos); + } else { + if (section) { + section->setX(pos); + pos += section->width(); + } + item->setX(pos); + } + } + bool contains(int x, int y) const { + return (x >= item->x() && x < item->x() + item->width() && + y >= item->y() && y < item->y() + item->height()); + } + + QDeclarativeItem *item; + QDeclarativeItem *section; + QDeclarativeListView *view; + QDeclarativeListViewAttached *attached; + int index; +}; + +//---------------------------------------------------------------------------- + +class QDeclarativeListViewPrivate : public QDeclarativeFlickablePrivate +{ + Q_DECLARE_PUBLIC(QDeclarativeListView) + +public: + QDeclarativeListViewPrivate() + : currentItem(0), orient(QDeclarativeListView::Vertical) + , visiblePos(0), visibleIndex(0) + , averageSize(100.0), currentIndex(-1), requestedIndex(-1) + , itemCount(0), highlightRangeStart(0), highlightRangeEnd(0) + , highlightComponent(0), highlight(0), trackedItem(0) + , moveReason(Other), buffer(0), highlightPosAnimator(0), highlightSizeAnimator(0) + , sectionCriteria(0), spacing(0.0) + , highlightMoveSpeed(400), highlightMoveDuration(-1) + , highlightResizeSpeed(400), highlightResizeDuration(-1), highlightRange(QDeclarativeListView::NoHighlightRange) + , snapMode(QDeclarativeListView::NoSnap), overshootDist(0.0) + , footerComponent(0), footer(0), headerComponent(0), header(0) + , bufferMode(BufferBefore | BufferAfter) + , ownModel(false), wrap(false), autoHighlight(true), haveHighlightRange(false) + , correctFlick(false), inFlickCorrection(false), lazyRelease(false) + , deferredRelease(false), layoutScheduled(false), minExtentDirty(true), maxExtentDirty(true) + {} + + void init(); + void clear(); + FxListItem *createItem(int modelIndex); + void releaseItem(FxListItem *item); + + FxListItem *visibleItem(int modelIndex) const { + if (modelIndex >= visibleIndex && modelIndex < visibleIndex + visibleItems.count()) { + for (int i = modelIndex - visibleIndex; i < visibleItems.count(); ++i) { + FxListItem *item = visibleItems.at(i); + if (item->index == modelIndex) + return item; + } + } + return 0; + } + + FxListItem *firstVisibleItem() const { + const qreal pos = position(); + for (int i = 0; i < visibleItems.count(); ++i) { + FxListItem *item = visibleItems.at(i); + if (item->index != -1 && item->endPosition() > pos) + return item; + } + return visibleItems.count() ? visibleItems.first() : 0; + } + + FxListItem *nextVisibleItem() const { + const qreal pos = position(); + bool foundFirst = false; + for (int i = 0; i < visibleItems.count(); ++i) { + FxListItem *item = visibleItems.at(i); + if (item->index != -1) { + if (foundFirst) + return item; + else if (item->position() < pos && item->endPosition() > pos) + foundFirst = true; + } + } + return 0; + } + + qreal position() const { + Q_Q(const QDeclarativeListView); + return orient == QDeclarativeListView::Vertical ? q->contentY() : q->contentX(); + } + void setPosition(qreal pos) { + Q_Q(QDeclarativeListView); + if (orient == QDeclarativeListView::Vertical) + q->setContentY(pos); + else + q->setContentX(pos); + } + qreal size() const { + Q_Q(const QDeclarativeListView); + return orient == QDeclarativeListView::Vertical ? q->height() : q->width(); + } + + qreal startPosition() const { + qreal pos = 0; + if (!visibleItems.isEmpty()) { + pos = (*visibleItems.constBegin())->position(); + if (visibleIndex > 0) + pos -= visibleIndex * (averageSize + spacing); + } + return pos; + } + + qreal endPosition() 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); + } + return pos; + } + + qreal positionAt(int modelIndex) const { + if (FxListItem *item = visibleItem(modelIndex)) + return item->position(); + if (!visibleItems.isEmpty()) { + if (modelIndex < visibleIndex) { + int count = visibleIndex - modelIndex; + return (*visibleItems.constBegin())->position() - count * (averageSize + spacing); + } else { + int idx = visibleItems.count() - 1; + while (idx >= 0 && visibleItems.at(idx)->index == -1) + --idx; + if (idx < 0) + idx = visibleIndex; + else + idx = visibleItems.at(idx)->index; + int count = modelIndex - idx - 1; + return (*(--visibleItems.constEnd()))->endPosition() + spacing + count * (averageSize + spacing) + 1; + } + } + return 0; + } + + qreal endPositionAt(int modelIndex) const { + if (FxListItem *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 - 1; + } else { + int idx = visibleItems.count() - 1; + while (idx >= 0 && visibleItems.at(idx)->index == -1) + --idx; + if (idx < 0) + idx = visibleIndex; + else + idx = visibleItems.at(idx)->index; + int count = modelIndex - idx - 1; + return (*(--visibleItems.constEnd()))->endPosition() + count * (averageSize + spacing); + } + } + return 0; + } + + QString sectionAt(int modelIndex) { + if (FxListItem *item = visibleItem(modelIndex)) + return item->attached->section(); + + QString section; + if (sectionCriteria) { + QString propValue = model->stringValue(modelIndex, sectionCriteria->property()); + section = sectionCriteria->sectionString(propValue); + } + + return section; + } + + bool isValid() const { + return model && model->count() && model->isValid(); + } + + int snapIndex() { + int index = currentIndex; + for (int i = 0; i < visibleItems.count(); ++i) { + FxListItem *item = visibleItems[i]; + if (item->index == -1) + continue; + qreal itemTop = item->position(); + if (itemTop >= highlight->position()-item->size()/2 && itemTop < highlight->position()+item->size()/2) + return item->index; + } + return index; + } + + qreal snapPosAt(qreal pos) { + for (int i = 0; i < visibleItems.count(); ++i) { + FxListItem *item = visibleItems[i]; + if (item->index == -1) + continue; + qreal itemTop = item->position(); + if (itemTop+item->size()/2 >= pos && itemTop <= pos) + return item->position(); + } + if (visibleItems.count()) { + qreal firstPos = visibleItems.first()->position(); + qreal endPos = visibleItems.last()->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 - startPosition()) / averageSize) * averageSize + startPosition(); + } + + FxListItem *snapItemAt(qreal pos) { + for (int i = 0; i < visibleItems.count(); ++i) { + FxListItem *item = visibleItems[i]; + if (item->index == -1) + continue; + qreal itemTop = item->position(); + if (item->index == model->count()-1 || (itemTop+item->size()/2 >= pos)) + return item; + } + if (visibleItems.count() && visibleItems.first()->position() <= pos) + return visibleItems.first(); + return 0; + } + + int lastVisibleIndex() const { + int lastIndex = -1; + for (int i = visibleItems.count()-1; i >= 0; --i) { + FxListItem *listItem = visibleItems.at(i); + if (listItem->index != -1) { + lastIndex = listItem->index; + break; + } + } + return lastIndex; + } + + // map a model index to visibleItems index. + // These may differ if removed items are still present in the visible list, + // e.g. doing a removal animation + int mapFromModel(int modelIndex) const { + if (modelIndex < visibleIndex || modelIndex >= visibleIndex + visibleItems.count()) + return -1; + for (int i = 0; i < visibleItems.count(); ++i) { + FxListItem *listItem = visibleItems.at(i); + if (listItem->index == modelIndex) + return i + visibleIndex; + if (listItem->index > modelIndex) + return -1; + } + return -1; // Not in visibleList + } + + bool mapRangeFromModel(int &index, int &count) const { + if (index + count < visibleIndex) + return false; + + int lastIndex = -1; + for (int i = visibleItems.count()-1; i >= 0; --i) { + FxListItem *listItem = visibleItems.at(i); + if (listItem->index != -1) { + lastIndex = listItem->index; + break; + } + } + + if (index > lastIndex) + return false; + + int last = qMin(index + count - 1, lastIndex); + index = qMax(index, visibleIndex); + count = last - index + 1; + + return true; + } + + void updateViewport() { + Q_Q(QDeclarativeListView); + if (orient == QDeclarativeListView::Vertical) { + q->setContentHeight(endPosition() - startPosition() + 1); + } else { + q->setContentWidth(endPosition() - startPosition() + 1); + } + } + + void itemGeometryChanged(QDeclarativeItem *item, const QRectF &newGeometry, const QRectF &oldGeometry) { + Q_Q(QDeclarativeListView); + QDeclarativeFlickablePrivate::itemGeometryChanged(item, newGeometry, oldGeometry); + if (item != viewport && (!highlight || item != highlight->item)) { + if ((orient == QDeclarativeListView::Vertical && newGeometry.height() != oldGeometry.height()) + || (orient == QDeclarativeListView::Horizontal && newGeometry.width() != oldGeometry.width())) { + scheduleLayout(); + } + } + if (trackedItem && trackedItem->item == item) + q->trackedPositionChanged(); + } + + // for debugging only + void checkVisible() const { + int skip = 0; + for (int i = 0; i < visibleItems.count(); ++i) { + FxListItem *listItem = visibleItems.at(i); + if (listItem->index == -1) { + ++skip; + } else if (listItem->index != visibleIndex + i - skip) { + qFatal("index %d %d %d", visibleIndex, i, listItem->index); + } + } + } + + void refill(qreal from, qreal to, bool doBuffer = false); + void scheduleLayout(); + void layout(); + void updateUnrequestedIndexes(); + void updateUnrequestedPositions(); + void updateTrackedItem(); + void createHighlight(); + void updateHighlight(); + void createSection(FxListItem *); + void updateSections(); + void updateCurrentSection(); + void updateCurrent(int); + void updateAverage(); + void updateHeader(); + void updateFooter(); + void fixupPosition(); + virtual void fixup(AxisData &data, qreal minExtent, qreal maxExtent); + virtual void flick(QDeclarativeFlickablePrivate::AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize, + QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity); + + QDeclarativeGuard model; + QVariant modelVariant; + QList visibleItems; + QHash unrequestedItems; + FxListItem *currentItem; + QDeclarativeListView::Orientation orient; + int visiblePos; + int visibleIndex; + qreal averageSize; + int currentIndex; + int requestedIndex; + int itemCount; + qreal highlightRangeStart; + qreal highlightRangeEnd; + QDeclarativeComponent *highlightComponent; + FxListItem *highlight; + FxListItem *trackedItem; + enum MovementReason { Other, SetIndex, Mouse }; + MovementReason moveReason; + int buffer; + QSmoothedAnimation *highlightPosAnimator; + QSmoothedAnimation *highlightSizeAnimator; + QDeclarativeViewSection *sectionCriteria; + QString currentSection; + static const int sectionCacheSize = 3; + QDeclarativeItem *sectionCache[sectionCacheSize]; + qreal spacing; + qreal highlightMoveSpeed; + int highlightMoveDuration; + qreal highlightResizeSpeed; + int highlightResizeDuration; + QDeclarativeListView::HighlightRangeMode highlightRange; + QDeclarativeListView::SnapMode snapMode; + qreal overshootDist; + QDeclarativeComponent *footerComponent; + FxListItem *footer; + QDeclarativeComponent *headerComponent; + FxListItem *header; + enum BufferMode { NoBuffer = 0x00, BufferBefore = 0x01, BufferAfter = 0x02 }; + int bufferMode; + mutable qreal minExtent; + mutable qreal maxExtent; + + bool ownModel : 1; + bool wrap : 1; + bool autoHighlight : 1; + bool haveHighlightRange : 1; + bool correctFlick : 1; + bool inFlickCorrection : 1; + bool lazyRelease : 1; + bool deferredRelease : 1; + bool layoutScheduled : 1; + mutable bool minExtentDirty : 1; + mutable bool maxExtentDirty : 1; +}; + +void QDeclarativeListViewPrivate::init() +{ + Q_Q(QDeclarativeListView); + q->setFlag(QGraphicsItem::ItemIsFocusScope); + addItemChangeListener(this, Geometry); + QObject::connect(q, SIGNAL(movementEnded()), q, SLOT(animStopped())); + q->setFlickableDirection(QDeclarativeFlickable::VerticalFlick); + ::memset(sectionCache, 0, sizeof(QDeclarativeItem*) * sectionCacheSize); +} + +void QDeclarativeListViewPrivate::clear() +{ + timeline.clear(); + for (int i = 0; i < visibleItems.count(); ++i) + releaseItem(visibleItems.at(i)); + visibleItems.clear(); + for (int i = 0; i < sectionCacheSize; ++i) { + delete sectionCache[i]; + sectionCache[i] = 0; + } + visiblePos = header ? header->size() : 0; + visibleIndex = 0; + releaseItem(currentItem); + currentItem = 0; + createHighlight(); + trackedItem = 0; + minExtentDirty = true; + maxExtentDirty = true; + itemCount = 0; +} + +FxListItem *QDeclarativeListViewPrivate::createItem(int modelIndex) +{ + Q_Q(QDeclarativeListView); + // create object + requestedIndex = modelIndex; + FxListItem *listItem = 0; + if (QDeclarativeItem *item = model->item(modelIndex, false)) { + listItem = new FxListItem(item, q); + 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 (FxListItem *item = visibleItem(modelIndex-1)) + listItem->attached->m_prevSection = item->attached->section(); + else + listItem->attached->m_prevSection = sectionAt(modelIndex-1); + } + } + if (model->completePending()) { + // complete + listItem->item->setZValue(1); + listItem->item->setParentItem(q->viewport()); + model->completeItem(); + } else { + listItem->item->setParentItem(q->viewport()); + } + QDeclarativeItemPrivate *itemPrivate = static_cast(QGraphicsItemPrivate::get(item)); + itemPrivate->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry); + if (sectionCriteria && sectionCriteria->delegate()) { + if (listItem->attached->m_prevSection != listItem->attached->m_section) + createSection(listItem); + } + unrequestedItems.remove(listItem->item); + } + requestedIndex = -1; + + return listItem; +} + +void QDeclarativeListViewPrivate::releaseItem(FxListItem *item) +{ + Q_Q(QDeclarativeListView); + if (!item || !model) + return; + if (trackedItem == item) + trackedItem = 0; + QDeclarativeItemPrivate *itemPrivate = static_cast(QGraphicsItemPrivate::get(item->item)); + itemPrivate->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry); + if (model->release(item->item) == 0) { + // item was not destroyed, and we no longer reference it. + unrequestedItems.insert(item->item, model->indexOf(item->item, q)); + } + if (item->section) { + int i = 0; + do { + if (!sectionCache[i]) { + sectionCache[i] = item->section; + sectionCache[i]->setVisible(false); + item->section = 0; + break; + } + ++i; + } while (i < sectionCacheSize); + delete item->section; + } + delete item; +} + +void QDeclarativeListViewPrivate::refill(qreal from, qreal to, bool doBuffer) +{ + Q_Q(QDeclarativeListView); + if (!isValid() || !q->isComponentComplete()) + return; + itemCount = model->count(); + qreal bufferFrom = from - buffer; + qreal bufferTo = to + buffer; + qreal fillFrom = from; + qreal fillTo = to; + if (doBuffer && (bufferMode & BufferAfter)) + fillTo = bufferTo; + if (doBuffer && (bufferMode & BufferBefore)) + fillFrom = bufferFrom; + + int modelIndex = visibleIndex; + qreal itemEnd = visiblePos-1; + if (!visibleItems.isEmpty()) { + visiblePos = (*visibleItems.constBegin())->position(); + itemEnd = (*(--visibleItems.constEnd()))->endPosition() + spacing; + int i = visibleItems.count() - 1; + while (i > 0 && visibleItems.at(i)->index == -1) + --i; + modelIndex = visibleItems.at(i)->index + 1; + } + + bool changed = false; + FxListItem *item = 0; + int pos = itemEnd + 1; + while (modelIndex < model->count() && pos <= fillTo) { +// qDebug() << "refill: append item" << modelIndex << "pos" << pos; + if (!(item = createItem(modelIndex))) + break; + item->setPosition(pos); + pos += item->size() + spacing; + visibleItems.append(item); + ++modelIndex; + changed = true; + if (doBuffer) // never buffer more than one item per frame + break; + } + while (visibleIndex > 0 && visibleIndex <= model->count() && visiblePos-1 >= fillFrom) { +// qDebug() << "refill: prepend item" << visibleIndex-1 << "current top pos" << visiblePos; + if (!(item = createItem(visibleIndex-1))) + break; + --visibleIndex; + visiblePos -= item->size() + spacing; + item->setPosition(visiblePos); + visibleItems.prepend(item); + changed = true; + if (doBuffer) // never buffer more than one item per frame + break; + } + + if (!lazyRelease || !changed || deferredRelease) { // avoid destroying items in the same frame that we create + while (visibleItems.count() > 1 && (item = visibleItems.first()) && item->endPosition() < bufferFrom) { + if (item->attached->delayRemove()) + break; +// qDebug() << "refill: remove first" << visibleIndex << "top end pos" << item->endPosition(); + if (item->index != -1) + visibleIndex++; + visibleItems.removeFirst(); + releaseItem(item); + changed = true; + } + while (visibleItems.count() > 1 && (item = visibleItems.last()) && item->position() > bufferTo) { + if (item->attached->delayRemove()) + break; +// qDebug() << "refill: remove last" << visibleIndex+visibleItems.count()-1 << item->position(); + visibleItems.removeLast(); + releaseItem(item); + changed = true; + } + deferredRelease = false; + } else { + deferredRelease = true; + } + if (changed) { + minExtentDirty = true; + maxExtentDirty = true; + if (visibleItems.count()) + visiblePos = (*visibleItems.constBegin())->position(); + updateAverage(); + if (sectionCriteria) + updateCurrentSection(); + if (header) + updateHeader(); + if (footer) + updateFooter(); + updateViewport(); + updateUnrequestedPositions(); + } else if (!doBuffer && buffer && bufferMode != NoBuffer) { + refill(from, to, true); + } + lazyRelease = false; +} + +void QDeclarativeListViewPrivate::scheduleLayout() +{ + Q_Q(QDeclarativeListView); + if (!layoutScheduled) { + layoutScheduled = true; + QCoreApplication::postEvent(q, new QEvent(QEvent::User), Qt::HighEventPriority); + } +} + +void QDeclarativeListViewPrivate::layout() +{ + Q_Q(QDeclarativeListView); + layoutScheduled = false; + if (!isValid()) { + clear(); + setPosition(0); + return; + } + updateSections(); + if (!visibleItems.isEmpty()) { + int oldEnd = visibleItems.last()->endPosition(); + int pos = visibleItems.first()->endPosition() + spacing + 1; + for (int i=1; i < visibleItems.count(); ++i) { + FxListItem *item = visibleItems.at(i); + item->setPosition(pos); + pos += item->size() + spacing; + } + // move current item if it is after the visible items. + if (currentItem && currentIndex > lastVisibleIndex()) + currentItem->setPosition(currentItem->position() + (visibleItems.last()->endPosition() - oldEnd)); + } + q->refill(); + minExtentDirty = true; + maxExtentDirty = true; + updateHighlight(); + fixupPosition(); + q->refill(); + if (header) + updateHeader(); + if (footer) + updateFooter(); + updateViewport(); +} + +void QDeclarativeListViewPrivate::updateUnrequestedIndexes() +{ + Q_Q(QDeclarativeListView); + QHash::iterator it; + for (it = unrequestedItems.begin(); it != unrequestedItems.end(); ++it) + *it = model->indexOf(it.key(), q); +} + +void QDeclarativeListViewPrivate::updateUnrequestedPositions() +{ + Q_Q(QDeclarativeListView); + if (unrequestedItems.count()) { + qreal pos = position(); + QHash::const_iterator it; + for (it = unrequestedItems.begin(); it != unrequestedItems.end(); ++it) { + QDeclarativeItem *item = it.key(); + if (orient == QDeclarativeListView::Vertical) { + if (item->y() + item->height() > pos && item->y() < pos + q->height()) + item->setY(positionAt(*it)); + } else { + if (item->x() + item->width() > pos && item->x() < pos + q->width()) + item->setX(positionAt(*it)); + } + } + } +} + +void QDeclarativeListViewPrivate::updateTrackedItem() +{ + Q_Q(QDeclarativeListView); + FxListItem *item = currentItem; + if (highlight) + item = highlight; + trackedItem = item; + if (trackedItem) + q->trackedPositionChanged(); +} + +void QDeclarativeListViewPrivate::createHighlight() +{ + Q_Q(QDeclarativeListView); + bool changed = false; + if (highlight) { + if (trackedItem == highlight) + trackedItem = 0; + delete highlight->item; + delete highlight; + highlight = 0; + delete highlightPosAnimator; + delete highlightSizeAnimator; + highlightPosAnimator = 0; + highlightSizeAnimator = 0; + changed = true; + } + + if (currentItem) { + QDeclarativeItem *item = 0; + if (highlightComponent) { + QDeclarativeContext *highlightContext = new QDeclarativeContext(qmlContext(q)); + QObject *nobj = highlightComponent->create(highlightContext); + if (nobj) { + QDeclarative_setParent_noEvent(highlightContext, nobj); + item = qobject_cast(nobj); + if (!item) + delete nobj; + } else { + delete highlightContext; + } + } else { + item = new QDeclarativeItem; + } + if (item) { + QDeclarative_setParent_noEvent(item, q->viewport()); + item->setParentItem(q->viewport()); + highlight = new FxListItem(item, q); + if (currentItem && autoHighlight) { + if (orient == QDeclarativeListView::Vertical) { + highlight->item->setHeight(currentItem->item->height()); + } else { + highlight->item->setWidth(currentItem->item->width()); + } + } + QDeclarativeItemPrivate *itemPrivate = static_cast(QGraphicsItemPrivate::get(item)); + itemPrivate->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry); + const QLatin1String posProp(orient == QDeclarativeListView::Vertical ? "y" : "x"); + highlightPosAnimator = new QSmoothedAnimation(q); + highlightPosAnimator->target = QDeclarativeProperty(highlight->item, posProp); + highlightPosAnimator->velocity = highlightMoveSpeed; + highlightPosAnimator->userDuration = highlightMoveDuration; + const QLatin1String sizeProp(orient == QDeclarativeListView::Vertical ? "height" : "width"); + highlightSizeAnimator = new QSmoothedAnimation(q); + highlightSizeAnimator->velocity = highlightResizeSpeed; + highlightSizeAnimator->userDuration = highlightResizeDuration; + highlightSizeAnimator->target = QDeclarativeProperty(highlight->item, sizeProp); + if (autoHighlight) { + highlightPosAnimator->restart(); + highlightSizeAnimator->restart(); + } + changed = true; + } + } + if (changed) + emit q->highlightItemChanged(); +} + +void QDeclarativeListViewPrivate::updateHighlight() +{ + if ((!currentItem && highlight) || (currentItem && !highlight)) + createHighlight(); + if (currentItem && autoHighlight && highlight && !movingHorizontally && !movingVertically) { + // auto-update highlight + highlightPosAnimator->to = currentItem->position(); + highlightSizeAnimator->to = currentItem->size(); + if (orient == QDeclarativeListView::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 QDeclarativeListViewPrivate::createSection(FxListItem *listItem) +{ + Q_Q(QDeclarativeListView); + if (!sectionCriteria || !sectionCriteria->delegate()) + return; + if (listItem->attached->m_prevSection != listItem->attached->m_section) { + if (!listItem->section) { + int i = sectionCacheSize-1; + while (i >= 0 && !sectionCache[i]) + --i; + if (i >= 0) { + listItem->section = sectionCache[i]; + sectionCache[i] = 0; + listItem->section->setVisible(true); + QDeclarativeContext *context = QDeclarativeEngine::contextForObject(listItem->section)->parentContext(); + context->setContextProperty(QLatin1String("section"), listItem->attached->m_section); + } else { + QDeclarativeContext *context = new QDeclarativeContext(qmlContext(q)); + context->setContextProperty(QLatin1String("section"), listItem->attached->m_section); + QObject *nobj = sectionCriteria->delegate()->create(context); + if (nobj) { + QDeclarative_setParent_noEvent(context, nobj); + listItem->section = qobject_cast(nobj); + if (!listItem->section) { + delete nobj; + } else { + listItem->section->setZValue(1); + QDeclarative_setParent_noEvent(listItem->section, q->viewport()); + listItem->section->setParentItem(q->viewport()); + } + } else { + delete context; + } + } + } + } else if (listItem->section) { + int i = 0; + do { + if (!sectionCache[i]) { + sectionCache[i] = listItem->section; + sectionCache[i]->setVisible(false); + listItem->section = 0; + return; + } + ++i; + } while (i < sectionCacheSize); + delete listItem->section; + listItem->section = 0; + } +} + +void QDeclarativeListViewPrivate::updateSections() +{ + if (sectionCriteria) { + QString prevSection; + if (visibleIndex > 0) + prevSection = sectionAt(visibleIndex-1); + for (int i = 0; i < visibleItems.count(); ++i) { + if (visibleItems.at(i)->index != -1) { + QDeclarativeListViewAttached *attached = visibleItems.at(i)->attached; + attached->setPrevSection(prevSection); + createSection(visibleItems.at(i)); + prevSection = attached->section(); + } + } + } +} + +void QDeclarativeListViewPrivate::updateCurrentSection() +{ + if (!sectionCriteria || visibleItems.isEmpty()) { + currentSection = QString(); + return; + } + int index = 0; + while (visibleItems.at(index)->endPosition() < position() && index < visibleItems.count()) + ++index; + + if (index < visibleItems.count()) + currentSection = visibleItems.at(index)->attached->section(); + else + currentSection = visibleItems.first()->attached->section(); +} + +void QDeclarativeListViewPrivate::updateCurrent(int modelIndex) +{ + Q_Q(QDeclarativeListView); + if (!q->isComponentComplete() || !isValid() || modelIndex < 0 || modelIndex >= model->count()) { + if (currentItem) { + currentItem->attached->setIsCurrentItem(false); + releaseItem(currentItem); + currentItem = 0; + currentIndex = -1; + updateHighlight(); + emit q->currentIndexChanged(); + } + return; + } + + if (currentItem && currentIndex == modelIndex) { + updateHighlight(); + return; + } + FxListItem *oldCurrentItem = currentItem; + currentIndex = modelIndex; + currentItem = createItem(modelIndex); + if (oldCurrentItem && (!currentItem || oldCurrentItem->item != currentItem->item)) + oldCurrentItem->attached->setIsCurrentItem(false); + if (currentItem) { + if (modelIndex == visibleIndex - 1) { + // We can calculate exact postion in this case + currentItem->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. + currentItem->setPosition(positionAt(modelIndex)); + } + currentItem->item->setFocus(true); + currentItem->attached->setIsCurrentItem(true); + } + updateHighlight(); + emit q->currentIndexChanged(); + // Release the old current item + releaseItem(oldCurrentItem); +} + +void QDeclarativeListViewPrivate::updateAverage() +{ + if (!visibleItems.count()) + return; + qreal sum = 0.0; + for (int i = 0; i < visibleItems.count(); ++i) + sum += visibleItems.at(i)->size(); + averageSize = sum / visibleItems.count(); +} + +void QDeclarativeListViewPrivate::updateFooter() +{ + Q_Q(QDeclarativeListView); + if (!footer && footerComponent) { + QDeclarativeItem *item = 0; + QDeclarativeContext *context = new QDeclarativeContext(qmlContext(q)); + QObject *nobj = footerComponent->create(context); + if (nobj) { + QDeclarative_setParent_noEvent(context, nobj); + item = qobject_cast(nobj); + if (!item) + delete nobj; + } else { + delete context; + } + if (item) { + QDeclarative_setParent_noEvent(item, q->viewport()); + item->setParentItem(q->viewport()); + item->setZValue(1); + footer = new FxListItem(item, q); + } + } + if (footer) { + if (visibleItems.count()) { + qreal endPos = endPosition(); + if (lastVisibleIndex() == model->count()-1) { + footer->setPosition(endPos); + } else { + qreal visiblePos = position() + q->height(); + if (endPos <= visiblePos || footer->position() < endPos) + footer->setPosition(endPos); + } + } else { + footer->setPosition(visiblePos); + } + } +} + +void QDeclarativeListViewPrivate::updateHeader() +{ + Q_Q(QDeclarativeListView); + if (!header && headerComponent) { + QDeclarativeItem *item = 0; + QDeclarativeContext *context = new QDeclarativeContext(qmlContext(q)); + QObject *nobj = headerComponent->create(context); + if (nobj) { + QDeclarative_setParent_noEvent(context, nobj); + item = qobject_cast(nobj); + if (!item) + delete nobj; + } else { + delete context; + } + if (item) { + QDeclarative_setParent_noEvent(item, q->viewport()); + item->setParentItem(q->viewport()); + item->setZValue(1); + header = new FxListItem(item, q); + if (visibleItems.isEmpty()) + visiblePos = header->size(); + } + } + if (header) { + if (visibleItems.count()) { + qreal startPos = startPosition(); + if (visibleIndex == 0) { + header->setPosition(startPos - header->size()); + } else { + if (position() <= startPos || header->position() > startPos - header->size()) + header->setPosition(startPos - header->size()); + } + } else { + header->setPosition(0); + } + } +} + +void QDeclarativeListViewPrivate::fixupPosition() +{ + moveReason = Other; + if (orient == QDeclarativeListView::Vertical) + fixupY(); + else + fixupX(); +} + +void QDeclarativeListViewPrivate::fixup(AxisData &data, qreal minExtent, qreal maxExtent) +{ + Q_Q(QDeclarativeListView); + if ((orient == QDeclarativeListView::Horizontal && &data == &vData) + || (orient == QDeclarativeListView::Vertical && &data == &hData)) + return; + + int oldDuration = fixupDuration; + fixupDuration = moveReason == Mouse ? fixupDuration : 0; + + if (haveHighlightRange && highlightRange == QDeclarativeListView::StrictlyEnforceRange) { + if (currentItem) { + updateHighlight(); + qreal pos = currentItem->position(); + qreal viewPos = position(); + if (viewPos < pos + currentItem->size() - highlightRangeEnd) + viewPos = pos + currentItem->size() - highlightRangeEnd; + if (viewPos > pos - highlightRangeStart) + viewPos = pos - highlightRangeStart; + + timeline.reset(data.move); + if (viewPos != position()) { + if (fixupDuration) { + timeline.move(data.move, -viewPos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2); + } else { + data.move.setValue(-viewPos); + q->viewportMoved(); + } + } + vTime = timeline.time(); + } + } else if (snapMode != QDeclarativeListView::NoSnap) { + if (FxListItem *item = snapItemAt(position())) { + qreal pos = qMin(item->position() - highlightRangeStart, -maxExtent); + qreal dist = qAbs(data.move + pos); + if (dist > 0) { + timeline.reset(data.move); + if (fixupDuration) { + timeline.move(data.move, -pos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2); + } else { + data.move.setValue(-pos); + q->viewportMoved(); + } + vTime = timeline.time(); + } + } + } else { + QDeclarativeFlickablePrivate::fixup(data, minExtent, maxExtent); + } + fixupDuration = oldDuration; +} + +void QDeclarativeListViewPrivate::flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize, + QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity) +{ + Q_Q(QDeclarativeListView); + + moveReason = Mouse; + if ((!haveHighlightRange || highlightRange != QDeclarativeListView::StrictlyEnforceRange) && snapMode == QDeclarativeListView::NoSnap) { + correctFlick = true; + QDeclarativeFlickablePrivate::flick(data, minExtent, maxExtent, vSize, fixupCallback, velocity); + return; + } + qreal maxDistance = 0; + // -ve velocity means list is moving up/left + if (velocity > 0) { + if (data.move.value() < minExtent) { + if (snapMode == QDeclarativeListView::SnapOneItem) { + if (FxListItem *item = firstVisibleItem()) + maxDistance = qAbs(item->position() + data.move.value()); + } else { + maxDistance = qAbs(minExtent - data.move.value()); + } + } + if (snapMode == QDeclarativeListView::NoSnap && highlightRange != QDeclarativeListView::StrictlyEnforceRange) + data.flickTarget = minExtent; + } else { + if (data.move.value() > maxExtent) { + if (snapMode == QDeclarativeListView::SnapOneItem) { + if (FxListItem *item = nextVisibleItem()) + maxDistance = qAbs(item->position() + data.move.value()); + } else { + maxDistance = qAbs(maxExtent - data.move.value()); + } + } + if (snapMode == QDeclarativeListView::NoSnap && highlightRange != QDeclarativeListView::StrictlyEnforceRange) + data.flickTarget = maxExtent; + } + bool overShoot = boundsBehavior == QDeclarativeFlickable::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 (!flickingHorizontally && !flickingVertically) { + // the initial flick - estimate boundary + qreal accel = deceleration; + 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 == QDeclarativeListView::SnapOneItem) { + data.flickTarget = -snapPosAt(-(data.move.value() - highlightRangeStart) + dist) + highlightRangeStart; + if (overShoot) { + if (data.flickTarget >= minExtent) { + overshootDist = overShootDistance(v, vSize); + data.flickTarget += overshootDist; + } else if (data.flickTarget <= maxExtent) { + overshootDist = overShootDistance(v, 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(v, vSize); + data.flickTarget += overshootDist; + } else if (data.flickTarget <= maxExtent) { + overshootDist = overShootDistance(v, vSize); + data.flickTarget -= overshootDist; + } + } + timeline.reset(data.move); + timeline.accel(data.move, v, accel, maxDistance + overshootDist); + timeline.callback(QDeclarativeTimeLineCallback(&data.move, fixupCallback, this)); + if (!flickingHorizontally && q->xflick()) { + flickingHorizontally = true; + emit q->flickingChanged(); + emit q->flickingHorizontallyChanged(); + emit q->flickStarted(); + } + if (!flickingVertically && q->yflick()) { + flickingVertically = true; + emit q->flickingChanged(); + emit q->flickingVerticallyChanged(); + emit q->flickStarted(); + } + correctFlick = true; + } else { + // reevaluate the target boundary. + qreal newtarget = data.flickTarget; + if (snapMode != QDeclarativeListView::NoSnap || highlightRange == QDeclarativeListView::StrictlyEnforceRange) + newtarget = -snapPosAt(-(data.flickTarget - highlightRangeStart)) + highlightRangeStart; + if (velocity < 0 && newtarget < maxExtent) + newtarget = maxExtent; + else if (velocity > 0 && newtarget > minExtent) + newtarget = minExtent; + if (newtarget == data.flickTarget) // boundary unchanged - nothing to do + 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 + (v < 0 ? -overshootDist : overshootDist)); + timeline.callback(QDeclarativeTimeLineCallback(&data.move, fixupCallback, this)); + } + } else { + correctFlick = false; + timeline.reset(data.move); + fixup(data, minExtent, maxExtent); + } +} + +//---------------------------------------------------------------------------- + +/*! + \qmlclass ListView QDeclarativeListView + \since 4.7 + \inherits Flickable + \brief The ListView item 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 + as ListView inherits from \l Flickable. + + For example, if there is a simple list model defined in a file \c ContactModel.qml like this: + + \snippet doc/src/snippets/declarative/listview/ContactModel.qml 0 + + Another component can display this model data in a ListView, like this: + + \table + \row + \o \snippet doc/src/snippets/declarative/listview/listview.qml import + \codeline + \snippet doc/src/snippets/declarative/listview/listview.qml classdocs simple + \o \image listview-simple.png + \endtable + + 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. Also, 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. + + \table + \row + \o \snippet doc/src/snippets/declarative/listview/listview.qml classdocs advanced + \o \image listview-highlight.png + \endtable + + In a ListView, delegates are instantiated as needed and may be destroyed at any time. + State should \e never be stored in a delegate. + + \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. +*/ + +QDeclarativeListView::QDeclarativeListView(QDeclarativeItem *parent) + : QDeclarativeFlickable(*(new QDeclarativeListViewPrivate), parent) +{ + Q_D(QDeclarativeListView); + d->init(); +} + +QDeclarativeListView::~QDeclarativeListView() +{ + Q_D(QDeclarativeListView); + d->clear(); + if (d->ownModel) + delete d->model; + delete d->header; + delete d->footer; +} + +/*! + \qmlattachedproperty bool 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 doc/src/snippets/declarative/listview/listview.qml isCurrentItem +*/ + +/*! + \qmlattachedproperty ListView ListView::view + This attached property holds the view that manages this delegate instance. + + It is attached to each instance of the delegate. +*/ + +/*! + \qmlattachedproperty string ListView::prevSection + 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 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 ListView::delayRemove + This attached property holds whether the delegate may be destroyed. + + It is attached to each instance of the delegate. + + 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 doc/src/snippets/declarative/listview/listview.qml delayRemove +*/ + +/*! + \qmlattachedsignal ListView::onAdd() + This attached handler is called immediately after an item is added to the view. +*/ + +/*! + \qmlattachedsignal ListView::onRemove() + This attached handler is called immediately before an item is removed from the view. +*/ + +/*! + \qmlproperty model 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} +*/ +QVariant QDeclarativeListView::model() const +{ + Q_D(const QDeclarativeListView); + return d->modelVariant; +} + +void QDeclarativeListView::setModel(const QVariant &model) +{ + Q_D(QDeclarativeListView); + if (d->modelVariant == model) + return; + if (d->model) { + disconnect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int))); + disconnect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int))); + disconnect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int))); + disconnect(d->model, SIGNAL(modelReset()), this, SLOT(modelReset())); + disconnect(d->model, SIGNAL(createdItem(int, QDeclarativeItem*)), this, SLOT(createdItem(int,QDeclarativeItem*))); + disconnect(d->model, SIGNAL(destroyingItem(QDeclarativeItem*)), this, SLOT(destroyingItem(QDeclarativeItem*))); + } + d->clear(); + d->setPosition(0); + d->modelVariant = model; + QObject *object = qvariant_cast(model); + QDeclarativeVisualModel *vim = 0; + if (object && (vim = qobject_cast(object))) { + if (d->ownModel) { + delete d->model; + d->ownModel = false; + } + d->model = vim; + } else { + if (!d->ownModel) { + d->model = new QDeclarativeVisualDataModel(qmlContext(this), this); + d->ownModel = true; + } + if (QDeclarativeVisualDataModel *dataModel = qobject_cast(d->model)) + dataModel->setModel(model); + } + if (d->model) { + d->bufferMode = QDeclarativeListViewPrivate::BufferBefore | QDeclarativeListViewPrivate::BufferAfter; + if (isComponentComplete()) { + refill(); + if (d->currentIndex >= d->model->count() || d->currentIndex < 0) { + setCurrentIndex(0); + } else { + d->moveReason = QDeclarativeListViewPrivate::SetIndex; + d->updateCurrent(d->currentIndex); + } + } + connect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int))); + connect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int))); + connect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int))); + connect(d->model, SIGNAL(modelReset()), this, SLOT(modelReset())); + connect(d->model, SIGNAL(createdItem(int, QDeclarativeItem*)), this, SLOT(createdItem(int,QDeclarativeItem*))); + connect(d->model, SIGNAL(destroyingItem(QDeclarativeItem*)), this, SLOT(destroyingItem(QDeclarativeItem*))); + emit countChanged(); + } + emit modelChanged(); +} + +/*! + \qmlproperty Component 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. + + Tthe ListView will lay out the items based on the size of the root item + in the delegate. + + \note Delegates are instantiated as needed and may be destroyed at any time. + State should \e never be stored in a delegate. +*/ +QDeclarativeComponent *QDeclarativeListView::delegate() const +{ + Q_D(const QDeclarativeListView); + if (d->model) { + if (QDeclarativeVisualDataModel *dataModel = qobject_cast(d->model)) + return dataModel->delegate(); + } + + return 0; +} + +void QDeclarativeListView::setDelegate(QDeclarativeComponent *delegate) +{ + Q_D(QDeclarativeListView); + if (delegate == this->delegate()) + return; + if (!d->ownModel) { + d->model = new QDeclarativeVisualDataModel(qmlContext(this)); + d->ownModel = true; + } + if (QDeclarativeVisualDataModel *dataModel = qobject_cast(d->model)) { + dataModel->setDelegate(delegate); + if (isComponentComplete()) { + for (int i = 0; i < d->visibleItems.count(); ++i) + d->releaseItem(d->visibleItems.at(i)); + d->visibleItems.clear(); + refill(); + d->moveReason = QDeclarativeListViewPrivate::SetIndex; + d->updateCurrent(d->currentIndex); + } + } + emit delegateChanged(); +} + +/*! + \qmlproperty int ListView::currentIndex + \qmlproperty Item ListView::currentItem + + \c currentIndex holds the index of the current item. + \c currentItem is the current item. Note that the position of the current item + may only be approximate until it becomes visible in the view. +*/ +int QDeclarativeListView::currentIndex() const +{ + Q_D(const QDeclarativeListView); + return d->currentIndex; +} + +void QDeclarativeListView::setCurrentIndex(int index) +{ + Q_D(QDeclarativeListView); + if (d->requestedIndex >= 0) // currently creating item + return; + if (isComponentComplete() && d->isValid() && index != d->currentIndex && index < d->model->count() && index >= 0) { + d->moveReason = QDeclarativeListViewPrivate::SetIndex; + cancelFlick(); + d->updateCurrent(index); + } else if (index != d->currentIndex) { + d->currentIndex = index; + emit currentIndexChanged(); + } +} + +QDeclarativeItem *QDeclarativeListView::currentItem() +{ + Q_D(QDeclarativeListView); + if (!d->currentItem) + return 0; + return d->currentItem->item; +} + +/*! + \qmlproperty Item 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 +*/ +QDeclarativeItem *QDeclarativeListView::highlightItem() +{ + Q_D(QDeclarativeListView); + if (!d->highlight) + return 0; + return d->highlight->item; +} + +/*! + \qmlproperty int ListView::count + This property holds the number of items in the view. +*/ +int QDeclarativeListView::count() const +{ + Q_D(const QDeclarativeListView); + if (d->model) + return d->model->count(); + return 0; +} + +/*! + \qmlproperty Component 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 resultant component instance is managed by the list + so as to stay with the current item, unless the highlightFollowsCurrentItem + property is false. + + \sa highlightItem, highlightFollowsCurrentItem +*/ +QDeclarativeComponent *QDeclarativeListView::highlight() const +{ + Q_D(const QDeclarativeListView); + return d->highlightComponent; +} + +void QDeclarativeListView::setHighlight(QDeclarativeComponent *highlight) +{ + Q_D(QDeclarativeListView); + if (highlight != d->highlightComponent) { + d->highlightComponent = highlight; + d->createHighlight(); + if (d->currentItem) + d->updateHighlight(); + emit highlightChanged(); + } +} + +/*! + \qmlproperty bool ListView::highlightFollowsCurrentItem + This property holds whether the highlight is managed by the view. + + If this property is true, 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 the a \l {SpringFollow} item: + + \snippet doc/src/snippets/declarative/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 +*/ +bool QDeclarativeListView::highlightFollowsCurrentItem() const +{ + Q_D(const QDeclarativeListView); + return d->autoHighlight; +} + +void QDeclarativeListView::setHighlightFollowsCurrentItem(bool autoHighlight) +{ + Q_D(QDeclarativeListView); + if (d->autoHighlight != autoHighlight) { + d->autoHighlight = autoHighlight; + if (autoHighlight) { + d->updateHighlight(); + } else { + if (d->highlightPosAnimator) + d->highlightPosAnimator->stop(); + if (d->highlightSizeAnimator) + d->highlightSizeAnimator->stop(); + } + emit highlightFollowsCurrentItemChanged(); + } +} + +//###Possibly rename these properties, since they are very useful even without a highlight? +/*! + \qmlproperty real ListView::preferredHighlightBegin + \qmlproperty real ListView::preferredHighlightEnd + \qmlproperty enumeration 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 + \o 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. + \o 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. + \o ListView.NoHighlightRange - this is the default value. + \endlist +*/ +qreal QDeclarativeListView::preferredHighlightBegin() const +{ + Q_D(const QDeclarativeListView); + return d->highlightRangeStart; +} + +void QDeclarativeListView::setPreferredHighlightBegin(qreal start) +{ + Q_D(QDeclarativeListView); + if (d->highlightRangeStart == start) + return; + d->highlightRangeStart = start; + d->haveHighlightRange = d->highlightRange != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd; + emit preferredHighlightBeginChanged(); +} + +qreal QDeclarativeListView::preferredHighlightEnd() const +{ + Q_D(const QDeclarativeListView); + return d->highlightRangeEnd; +} + +void QDeclarativeListView::setPreferredHighlightEnd(qreal end) +{ + Q_D(QDeclarativeListView); + if (d->highlightRangeEnd == end) + return; + d->highlightRangeEnd = end; + d->haveHighlightRange = d->highlightRange != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd; + emit preferredHighlightEndChanged(); +} + +QDeclarativeListView::HighlightRangeMode QDeclarativeListView::highlightRangeMode() const +{ + Q_D(const QDeclarativeListView); + return d->highlightRange; +} + +void QDeclarativeListView::setHighlightRangeMode(HighlightRangeMode mode) +{ + Q_D(QDeclarativeListView); + if (d->highlightRange == mode) + return; + d->highlightRange = mode; + d->haveHighlightRange = d->highlightRange != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd; + emit highlightRangeModeChanged(); +} + +/*! + \qmlproperty real ListView::spacing + + This property holds the spacing between items. +*/ +qreal QDeclarativeListView::spacing() const +{ + Q_D(const QDeclarativeListView); + return d->spacing; +} + +void QDeclarativeListView::setSpacing(qreal spacing) +{ + Q_D(QDeclarativeListView); + if (spacing != d->spacing) { + d->spacing = spacing; + d->layout(); + emit spacingChanged(); + } +} + +/*! + \qmlproperty enumeration ListView::orientation + This property holds the orientation of the list. + + Possible values: + + \list + \o ListView.Horizontal - Items are laid out horizontally + \o ListView.Vertical (default) - Items are laid out vertically + \endlist + + \table + \row + \o Horizontal orientation: + \image ListViewHorizontal.png + + \row + \o Vertical orientation: + \image listview-highlight.png + \endtable +*/ +QDeclarativeListView::Orientation QDeclarativeListView::orientation() const +{ + Q_D(const QDeclarativeListView); + return d->orient; +} + +void QDeclarativeListView::setOrientation(QDeclarativeListView::Orientation orientation) +{ + Q_D(QDeclarativeListView); + if (d->orient != orientation) { + d->orient = orientation; + if (d->orient == QDeclarativeListView::Vertical) { + setContentWidth(-1); + setFlickableDirection(VerticalFlick); + } else { + setContentHeight(-1); + setFlickableDirection(HorizontalFlick); + } + d->clear(); + d->setPosition(0); + refill(); + emit orientationChanged(); + d->updateCurrent(d->currentIndex); + } +} + +/*! + \qmlproperty bool 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. +*/ +bool QDeclarativeListView::isWrapEnabled() const +{ + Q_D(const QDeclarativeListView); + return d->wrap; +} + +void QDeclarativeListView::setWrapEnabled(bool wrap) +{ + Q_D(QDeclarativeListView); + if (d->wrap == wrap) + return; + d->wrap = wrap; + emit keyNavigationWrapsChanged(); +} + +/*! + \qmlproperty int ListView::cacheBuffer + This property determines whether delegates are retained outside the + visible area of the view. + + If this value is non-zero, the view keeps 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 retained. + + 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. +*/ +int QDeclarativeListView::cacheBuffer() const +{ + Q_D(const QDeclarativeListView); + return d->buffer; +} + +void QDeclarativeListView::setCacheBuffer(int b) +{ + Q_D(QDeclarativeListView); + if (d->buffer != b) { + d->buffer = b; + if (isComponentComplete()) { + d->bufferMode = QDeclarativeListViewPrivate::BufferBefore | QDeclarativeListViewPrivate::BufferAfter; + refill(); + } + emit cacheBufferChanged(); + } +} + +/*! + \qmlproperty string ListView::section.property + \qmlproperty enumeration ListView::section.criteria + These properties hold the expression to be evaluated for the \l section attached property. + + \c section.property hold the name of the property to use to determine + the section that holds the item. + + \c section.criteria holds the criteria to use to access the section. It + can be either: + + \list + \o ViewSection.FullString (default) - section is the value of the property. + \o ViewSection.FirstCharacter - section is the first character of the property value. + \endlist + + Each item in the list has attached properties named \c ListView.section and + \c ListView.prevSection. These may be used to place a section header for + related items. The example below assumes that the model is sorted by size of + pet. The section expression is the size property. If \c ListView.section and + \c ListView.prevSection differ, the item will display a section header. + + \snippet examples/declarative/modelviews/listview/sections.qml 0 + + \image ListViewSections.png +*/ +QDeclarativeViewSection *QDeclarativeListView::sectionCriteria() +{ + Q_D(QDeclarativeListView); + if (!d->sectionCriteria) + d->sectionCriteria = new QDeclarativeViewSection(this); + return d->sectionCriteria; +} + +/*! + \qmlproperty string ListView::currentSection + This property holds the section that is currently at the beginning of the view. +*/ +QString QDeclarativeListView::currentSection() const +{ + Q_D(const QDeclarativeListView); + return d->currentSection; +} + +/*! + \qmlproperty real ListView::highlightMoveSpeed + \qmlproperty int ListView::highlightMoveDuration + \qmlproperty real ListView::highlightResizeSpeed + \qmlproperty int ListView::highlightResizeDuration + + These properties hold the move and resize animation speed of the highlight delegate. + + \c 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 QDeclarativeListView::highlightMoveSpeed() const +{ + Q_D(const QDeclarativeListView);\ + return d->highlightMoveSpeed; +} + +void QDeclarativeListView::setHighlightMoveSpeed(qreal speed) +{ + Q_D(QDeclarativeListView);\ + if (d->highlightMoveSpeed != speed) { + d->highlightMoveSpeed = speed; + if (d->highlightPosAnimator) + d->highlightPosAnimator->velocity = d->highlightMoveSpeed; + emit highlightMoveSpeedChanged(); + } +} + +int QDeclarativeListView::highlightMoveDuration() const +{ + Q_D(const QDeclarativeListView); + return d->highlightMoveDuration; +} + +void QDeclarativeListView::setHighlightMoveDuration(int duration) +{ + Q_D(QDeclarativeListView);\ + if (d->highlightMoveDuration != duration) { + d->highlightMoveDuration = duration; + if (d->highlightPosAnimator) + d->highlightPosAnimator->userDuration = d->highlightMoveDuration; + emit highlightMoveDurationChanged(); + } +} + +qreal QDeclarativeListView::highlightResizeSpeed() const +{ + Q_D(const QDeclarativeListView);\ + return d->highlightResizeSpeed; +} + +void QDeclarativeListView::setHighlightResizeSpeed(qreal speed) +{ + Q_D(QDeclarativeListView);\ + if (d->highlightResizeSpeed != speed) { + d->highlightResizeSpeed = speed; + if (d->highlightSizeAnimator) + d->highlightSizeAnimator->velocity = d->highlightResizeSpeed; + emit highlightResizeSpeedChanged(); + } +} + +int QDeclarativeListView::highlightResizeDuration() const +{ + Q_D(const QDeclarativeListView); + return d->highlightResizeDuration; +} + +void QDeclarativeListView::setHighlightResizeDuration(int duration) +{ + Q_D(QDeclarativeListView);\ + if (d->highlightResizeDuration != duration) { + d->highlightResizeDuration = duration; + if (d->highlightSizeAnimator) + d->highlightSizeAnimator->userDuration = d->highlightResizeDuration; + emit highlightResizeDurationChanged(); + } +} + +/*! + \qmlproperty enumeration ListView::snapMode + + This property determines where the view's scrolling behavior stops following a drag or flick. + The allowed values are: + + \list + \o ListView.NoSnap (default) - the view stops anywhere within the visible area. + \o ListView.SnapToItem - the view settles with an item aligned with the start of + the view. + \o 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 +*/ +QDeclarativeListView::SnapMode QDeclarativeListView::snapMode() const +{ + Q_D(const QDeclarativeListView); + return d->snapMode; +} + +void QDeclarativeListView::setSnapMode(SnapMode mode) +{ + Q_D(QDeclarativeListView); + if (d->snapMode != mode) { + d->snapMode = mode; + emit snapModeChanged(); + } +} + +QDeclarativeComponent *QDeclarativeListView::footer() const +{ + Q_D(const QDeclarativeListView); + return d->footerComponent; +} + +void QDeclarativeListView::setFooter(QDeclarativeComponent *footer) +{ + Q_D(QDeclarativeListView); + if (d->footerComponent != footer) { + if (d->footer) { + delete d->footer; + d->footer = 0; + } + d->footerComponent = footer; + d->minExtentDirty = true; + d->maxExtentDirty = true; + d->updateFooter(); + d->updateViewport(); + emit footerChanged(); + } +} + +QDeclarativeComponent *QDeclarativeListView::header() const +{ + Q_D(const QDeclarativeListView); + return d->headerComponent; +} + +void QDeclarativeListView::setHeader(QDeclarativeComponent *header) +{ + Q_D(QDeclarativeListView); + if (d->headerComponent != header) { + if (d->header) { + delete d->header; + d->header = 0; + } + d->headerComponent = header; + d->minExtentDirty = true; + d->maxExtentDirty = true; + d->updateHeader(); + d->updateFooter(); + d->updateViewport(); + emit headerChanged(); + } +} + +bool QDeclarativeListView::event(QEvent *event) +{ + Q_D(QDeclarativeListView); + if (event->type() == QEvent::User) { + d->layout(); + return true; + } + + return QDeclarativeFlickable::event(event); +} + +void QDeclarativeListView::viewportMoved() +{ + Q_D(QDeclarativeListView); + QDeclarativeFlickable::viewportMoved(); + d->lazyRelease = true; + refill(); + if (d->flickingHorizontally || d->flickingVertically || d->movingHorizontally || d->movingVertically) + d->moveReason = QDeclarativeListViewPrivate::Mouse; + if (d->moveReason != QDeclarativeListViewPrivate::SetIndex) { + if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange && d->highlight) { + // reposition highlight + qreal pos = d->highlight->position(); + qreal viewPos = 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; + d->highlight->setPosition(qRound(pos)); + + // update current index + int idx = d->snapIndex(); + if (idx >= 0 && idx != d->currentIndex) + d->updateCurrent(idx); + } + } + + if ((d->flickingHorizontally || d->flickingVertically) && 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()) { + 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()); + d->bufferMode = QDeclarativeListViewPrivate::BufferBefore; + } 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()); + d->bufferMode = QDeclarativeListViewPrivate::BufferAfter; + } + } + + if (xflick()) { + 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()); + d->bufferMode = QDeclarativeListViewPrivate::BufferBefore; + } else if (d->hData.velocity < 0) { + const qreal maxX = maxXExtent(); + 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->bufferMode = QDeclarativeListViewPrivate::BufferAfter; + } + } + d->inFlickCorrection = false; + } +} + +qreal QDeclarativeListView::minYExtent() const +{ + Q_D(const QDeclarativeListView); + if (d->orient == QDeclarativeListView::Horizontal) + return QDeclarativeFlickable::minYExtent(); + if (d->minExtentDirty) { + d->minExtent = -d->startPosition(); + if (d->header && d->visibleItems.count()) + d->minExtent += d->header->size(); + if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange) { + d->minExtent += d->highlightRangeStart; + d->minExtent = qMax(d->minExtent, -(d->endPositionAt(0) - d->highlightRangeEnd + 1)); + } + d->minExtentDirty = false; + } + + return d->minExtent; +} + +qreal QDeclarativeListView::maxYExtent() const +{ + Q_D(const QDeclarativeListView); + if (d->orient == QDeclarativeListView::Horizontal) + return height(); + if (d->maxExtentDirty) { + if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange) { + d->maxExtent = -(d->positionAt(d->model->count()-1) - d->highlightRangeStart); + if (d->highlightRangeEnd != d->highlightRangeStart) + d->maxExtent = qMin(d->maxExtent, -(d->endPosition() - d->highlightRangeEnd + 1)); + } else { + d->maxExtent = -(d->endPosition() - height() + 1); + } + if (d->footer) + d->maxExtent -= d->footer->size(); + qreal minY = minYExtent(); + if (d->maxExtent > minY) + d->maxExtent = minY; + d->maxExtentDirty = false; + } + return d->maxExtent; +} + +qreal QDeclarativeListView::minXExtent() const +{ + Q_D(const QDeclarativeListView); + if (d->orient == QDeclarativeListView::Vertical) + return QDeclarativeFlickable::minXExtent(); + if (d->minExtentDirty) { + d->minExtent = -d->startPosition(); + if (d->header) + d->minExtent += d->header->size(); + if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange) { + d->minExtent += d->highlightRangeStart; + d->minExtent = qMax(d->minExtent, -(d->endPositionAt(0) - d->highlightRangeEnd + 1)); + } + d->minExtentDirty = false; + } + + return d->minExtent; +} + +qreal QDeclarativeListView::maxXExtent() const +{ + Q_D(const QDeclarativeListView); + if (d->orient == QDeclarativeListView::Vertical) + return width(); + if (d->maxExtentDirty) { + if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange) { + d->maxExtent = -(d->positionAt(d->model->count()-1) - d->highlightRangeStart); + if (d->highlightRangeEnd != d->highlightRangeStart) + d->maxExtent = qMin(d->maxExtent, -(d->endPosition() - d->highlightRangeEnd + 1)); + } else { + d->maxExtent = -(d->endPosition() - width() + 1); + } + if (d->footer) + d->maxExtent -= d->footer->size(); + qreal minX = minXExtent(); + if (d->maxExtent > minX) + d->maxExtent = minX; + d->maxExtentDirty = false; + } + + return d->maxExtent; +} + +void QDeclarativeListView::keyPressEvent(QKeyEvent *event) +{ + Q_D(QDeclarativeListView); + keyPressPreHandler(event); + if (event->isAccepted()) + return; + + if (d->model && d->model->count() && d->interactive) { + if ((d->orient == QDeclarativeListView::Horizontal && event->key() == Qt::Key_Left) + || (d->orient == QDeclarativeListView::Vertical && event->key() == Qt::Key_Up)) { + if (currentIndex() > 0 || (d->wrap && !event->isAutoRepeat())) { + decrementCurrentIndex(); + event->accept(); + return; + } else if (d->wrap) { + event->accept(); + return; + } + } else if ((d->orient == QDeclarativeListView::Horizontal && event->key() == Qt::Key_Right) + || (d->orient == QDeclarativeListView::Vertical && event->key() == Qt::Key_Down)) { + if (currentIndex() < d->model->count() - 1 || (d->wrap && !event->isAutoRepeat())) { + incrementCurrentIndex(); + event->accept(); + return; + } else if (d->wrap) { + event->accept(); + return; + } + } + } + event->ignore(); + QDeclarativeFlickable::keyPressEvent(event); +} + +/*! + \qmlmethod ListView::incrementCurrentIndex() + + Increments the current index. The current index will wrap + if keyNavigationWraps is true and it is currently at the end. +*/ +void QDeclarativeListView::incrementCurrentIndex() +{ + Q_D(QDeclarativeListView); + if (currentIndex() < d->model->count() - 1 || d->wrap) { + d->moveReason = QDeclarativeListViewPrivate::SetIndex; + int index = currentIndex()+1; + cancelFlick(); + d->updateCurrent(index < d->model->count() ? index : 0); + } +} + +/*! + \qmlmethod ListView::decrementCurrentIndex() + + Decrements the current index. The current index will wrap + if keyNavigationWraps is true and it is currently at the beginning. +*/ +void QDeclarativeListView::decrementCurrentIndex() +{ + Q_D(QDeclarativeListView); + if (currentIndex() > 0 || d->wrap) { + d->moveReason = QDeclarativeListViewPrivate::SetIndex; + int index = currentIndex()-1; + cancelFlick(); + d->updateCurrent(index >= 0 ? index : d->model->count()-1); + } +} + +/*! + \qmlmethod ListView::positionViewAtIndex(int index, PositionMode mode) + + Positions the view such that the \a index is at the position specified by + \a mode: + + \list + \o ListView.Beginning - position item at the top (or left for horizontal orientation) of the view. + \o ListView.Center - position item in the center of the view. + \o ListView.End - position item at bottom (or right for horizontal orientation) of the view. + \o ListView.Visible - if any part of the item is visible then take no action, otherwise + bring the item into view. + \o 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. +*/ +void QDeclarativeListView::positionViewAtIndex(int index, int mode) +{ + Q_D(QDeclarativeListView); + if (!d->isValid() || index < 0 || index >= d->model->count()) + return; + if (mode < Beginning || mode > Contain) + return; + + qreal pos = d->position(); + FxListItem *item = d->visibleItem(index); + if (!item) { + int itemPos = d->positionAt(index); + // save the currently visible items in case any of them end up visible again + QList oldVisible = d->visibleItems; + d->visibleItems.clear(); + d->visiblePos = itemPos; + d->visibleIndex = index; + d->setPosition(itemPos); + // now release the reference to all the old visible items. + for (int i = 0; i < oldVisible.count(); ++i) + d->releaseItem(oldVisible.at(i)); + item = d->visibleItem(index); + } + if (item) { + const qreal itemPos = item->position(); + switch (mode) { + case Beginning: + pos = itemPos; + break; + case Center: + pos = itemPos - (d->size() - item->size())/2; + break; + case End: + pos = itemPos - d->size() + item->size(); + break; + case Visible: + if (itemPos > pos + d->size()) + pos = itemPos - d->size() + item->size(); + else if (item->endPosition() < pos) + pos = itemPos; + break; + case Contain: + if (item->endPosition() > pos + d->size()) + pos = itemPos - d->size() + item->size(); + if (itemPos < pos) + pos = itemPos; + } + qreal maxExtent = d->orient == QDeclarativeListView::Vertical ? -maxYExtent() : -maxXExtent(); + pos = qMin(pos, maxExtent); + qreal minExtent = d->orient == QDeclarativeListView::Vertical ? -minYExtent() : -minXExtent(); + pos = qMax(pos, minExtent); + d->setPosition(pos); + } + d->fixupPosition(); +} + +/*! + \qmlmethod int 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. +*/ +int QDeclarativeListView::indexAt(int x, int y) const +{ + Q_D(const QDeclarativeListView); + for (int i = 0; i < d->visibleItems.count(); ++i) { + const FxListItem *listItem = d->visibleItems.at(i); + if(listItem->contains(x, y)) + return listItem->index; + } + + return -1; +} + +void QDeclarativeListView::componentComplete() +{ + Q_D(QDeclarativeListView); + QDeclarativeFlickable::componentComplete(); + if (d->isValid()) { + refill(); + d->moveReason = QDeclarativeListViewPrivate::SetIndex; + if (d->currentIndex < 0) + d->updateCurrent(0); + else + d->updateCurrent(d->currentIndex); + d->fixupPosition(); + } +} + +void QDeclarativeListView::refill() +{ + Q_D(QDeclarativeListView); + d->refill(d->position(), d->position()+d->size()-1); +} + +void QDeclarativeListView::trackedPositionChanged() +{ + Q_D(QDeclarativeListView); + if (!d->trackedItem || !d->currentItem) + return; + if (!d->flickingHorizontally && !d->flickingVertically && !d->movingHorizontally && !d->movingVertically + && d->moveReason == QDeclarativeListViewPrivate::SetIndex) { + const qreal trackedPos = qCeil(d->trackedItem->position()); + const qreal viewPos = d->position(); + if (d->haveHighlightRange) { + if (d->highlightRange == StrictlyEnforceRange) { + qreal pos = viewPos; + if (trackedPos > pos + d->highlightRangeEnd - d->trackedItem->size()) + pos = trackedPos - d->highlightRangeEnd + d->trackedItem->size(); + if (trackedPos < pos + d->highlightRangeStart) + pos = trackedPos - d->highlightRangeStart; + d->setPosition(pos); + } else { + qreal pos = viewPos; + if (trackedPos < d->startPosition() + d->highlightRangeStart) { + pos = d->startPosition(); + } else if (d->trackedItem->endPosition() > d->endPosition() - d->size() + d->highlightRangeEnd) { + pos = d->endPosition() - d->size(); + if (pos < d->startPosition()) + pos = d->startPosition(); + } else { + if (trackedPos < viewPos + d->highlightRangeStart) { + pos = trackedPos - d->highlightRangeStart; + } else if (trackedPos > viewPos + d->highlightRangeEnd - d->trackedItem->size()) { + pos = trackedPos - d->highlightRangeEnd + d->trackedItem->size(); + } + } + d->setPosition(pos); + } + } else { + if (trackedPos < viewPos && d->currentItem->position() < viewPos) { + d->setPosition(d->currentItem->position() < trackedPos ? trackedPos : d->currentItem->position()); + } else if (d->trackedItem->endPosition() > viewPos + d->size() + && d->currentItem->endPosition() > viewPos + d->size()) { + qreal pos; + if (d->trackedItem->endPosition() < d->currentItem->endPosition()) { + pos = d->trackedItem->endPosition() - d->size(); + if (d->trackedItem->size() > d->size()) + pos = trackedPos; + } else { + pos = d->currentItem->endPosition() - d->size(); + if (d->currentItem->size() > d->size()) + pos = d->currentItem->position(); + } + d->setPosition(pos); + } + } + } +} + +void QDeclarativeListView::itemsInserted(int modelIndex, int count) +{ + Q_D(QDeclarativeListView); + if (!isComponentComplete()) + return; + d->updateUnrequestedIndexes(); + d->moveReason = QDeclarativeListViewPrivate::Other; + if (!d->visibleItems.count() || d->model->count() <= 1) { + d->scheduleLayout(); + if (d->currentIndex >= modelIndex) { + // adjust current item index + d->currentIndex += count; + if (d->currentItem) + d->currentItem->index = d->currentIndex; + emit currentIndexChanged(); + } else if (d->currentIndex < 0) { + d->updateCurrent(0); + } + d->itemCount += count; + emit countChanged(); + return; + } + + int overlapCount = count; + if (!d->mapRangeFromModel(modelIndex, overlapCount)) { + int i = d->visibleItems.count() - 1; + while (i > 0 && d->visibleItems.at(i)->index == -1) + --i; + if (d->visibleItems.at(i)->index + 1 == modelIndex + && d->visibleItems.at(i)->endPosition() < d->buffer+d->position()+d->size()-1) { + // Special case of appending an item to the model. + modelIndex = d->visibleIndex + d->visibleItems.count(); + } else { + if (modelIndex < d->visibleIndex) { + // Insert before visible items + d->visibleIndex += count; + for (int i = 0; i < d->visibleItems.count(); ++i) { + FxListItem *listItem = d->visibleItems.at(i); + if (listItem->index != -1 && listItem->index >= modelIndex) + listItem->index += count; + } + } + if (d->currentIndex >= modelIndex) { + // adjust current item index + d->currentIndex += count; + if (d->currentItem) + d->currentItem->index = d->currentIndex; + emit currentIndexChanged(); + } + d->scheduleLayout(); + d->itemCount += count; + emit countChanged(); + return; + } + } + + // At least some of the added items will be visible + + int index = modelIndex - d->visibleIndex; + // index can be the next item past the end of the visible items list (i.e. appended) + int pos = index < d->visibleItems.count() ? d->visibleItems.at(index)->position() + : d->visibleItems.at(index-1)->endPosition()+d->spacing+1; + int initialPos = pos; + int diff = 0; + QList added; + bool addedVisible = false; + FxListItem *firstVisible = d->firstVisibleItem(); + if (firstVisible && pos < firstVisible->position()) { + // Insert items before the visible item. + int insertionIdx = index; + int i = 0; + int from = d->position() - d->buffer; + for (i = count-1; i >= 0 && pos > from; --i) { + if (!addedVisible) { + d->scheduleLayout(); + addedVisible = true; + } + FxListItem *item = d->createItem(modelIndex + i); + d->visibleItems.insert(insertionIdx, item); + pos -= item->size() + d->spacing; + item->setPosition(pos); + index++; + } + if (i >= 0) { + // If we didn't insert all our new items - anything + // before the current index is not visible - remove it. + while (insertionIdx--) { + FxListItem *item = d->visibleItems.takeFirst(); + if (item->index != -1) + d->visibleIndex++; + d->releaseItem(item); + } + } else { + // adjust pos of items before inserted items. + for (int i = insertionIdx-1; i >= 0; i--) { + FxListItem *listItem = d->visibleItems.at(i); + listItem->setPosition(listItem->position() - (initialPos - pos)); + } + } + } else { + int i = 0; + int to = d->buffer+d->position()+d->size()-1; + for (i = 0; i < count && pos <= to; ++i) { + if (!addedVisible) { + d->scheduleLayout(); + addedVisible = true; + } + FxListItem *item = d->createItem(modelIndex + i); + d->visibleItems.insert(index, item); + item->setPosition(pos); + added.append(item); + pos += item->size() + d->spacing; + ++index; + } + if (i != count) { + // We didn't insert all our new items, which means anything + // beyond the current index is not visible - remove it. + while (d->visibleItems.count() > index) + d->releaseItem(d->visibleItems.takeLast()); + } + diff = pos - initialPos; + } + if (d->currentIndex >= modelIndex) { + // adjust current item index + d->currentIndex += count; + if (d->currentItem) { + d->currentItem->index = d->currentIndex; + d->currentItem->setPosition(d->currentItem->position() + diff); + } + emit currentIndexChanged(); + } + // Update the indexes of the following visible items. + for (; index < d->visibleItems.count(); ++index) { + FxListItem *listItem = d->visibleItems.at(index); + if (d->currentItem && listItem->item != d->currentItem->item) + listItem->setPosition(listItem->position() + diff); + if (listItem->index != -1) + listItem->index += count; + } + // everything is in order now - emit add() signal + for (int j = 0; j < added.count(); ++j) + added.at(j)->attached->emitAdd(); + + d->itemCount += count; + emit countChanged(); +} + +void QDeclarativeListView::itemsRemoved(int modelIndex, int count) +{ + Q_D(QDeclarativeListView); + if (!isComponentComplete()) + return; + d->moveReason = QDeclarativeListViewPrivate::Other; + d->updateUnrequestedIndexes(); + d->itemCount -= count; + + FxListItem *firstVisible = d->firstVisibleItem(); + int preRemovedSize = 0; + bool removedVisible = false; + // Remove the items from the visible list, skipping anything already marked for removal + QList::Iterator it = d->visibleItems.begin(); + while (it != d->visibleItems.end()) { + FxListItem *item = *it; + if (item->index == -1 || item->index < modelIndex) { + // already removed, or before removed items + ++it; + } else if (item->index >= modelIndex + count) { + // after removed items + item->index -= count; + ++it; + } else { + // removed item + if (!removedVisible) { + d->scheduleLayout(); + removedVisible = true; + } + item->attached->emitRemove(); + if (item->attached->delayRemove()) { + item->index = -1; + connect(item->attached, SIGNAL(delayRemoveChanged()), this, SLOT(destroyRemoved()), Qt::QueuedConnection); + ++it; + } else { + if (item == firstVisible) + firstVisible = 0; + if (firstVisible && item->position() < firstVisible->position()) + preRemovedSize += item->size(); + it = d->visibleItems.erase(it); + d->releaseItem(item); + } + } + } + + if (firstVisible && d->visibleItems.first() != firstVisible) + d->visibleItems.first()->setPosition(d->visibleItems.first()->position() + preRemovedSize); + + // fix current + if (d->currentIndex >= modelIndex + count) { + d->currentIndex -= count; + if (d->currentItem) + d->currentItem->index -= count; + emit currentIndexChanged(); + } else if (d->currentIndex >= modelIndex && d->currentIndex < modelIndex + count) { + // current item has been removed. + d->currentItem->attached->setIsCurrentItem(false); + d->releaseItem(d->currentItem); + d->currentItem = 0; + d->currentIndex = -1; + if (d->itemCount) + d->updateCurrent(qMin(modelIndex, d->itemCount-1)); + } + + // update visibleIndex + for (it = d->visibleItems.begin(); it != d->visibleItems.end(); ++it) { + if ((*it)->index != -1) { + d->visibleIndex = (*it)->index; + break; + } + } + + if (removedVisible && d->visibleItems.isEmpty()) { + d->visibleIndex = 0; + d->visiblePos = d->header ? d->header->size() : 0; + d->timeline.clear(); + d->setPosition(0); + if (d->itemCount == 0) + update(); + } + + emit countChanged(); +} + +void QDeclarativeListView::destroyRemoved() +{ + Q_D(QDeclarativeListView); + for (QList::Iterator it = d->visibleItems.begin(); + it != d->visibleItems.end();) { + FxListItem *listItem = *it; + if (listItem->index == -1 && listItem->attached->delayRemove() == false) { + d->releaseItem(listItem); + it = d->visibleItems.erase(it); + } else { + ++it; + } + } + + // Correct the positioning of the items + d->layout(); +} + +void QDeclarativeListView::itemsMoved(int from, int to, int count) +{ + Q_D(QDeclarativeListView); + if (!isComponentComplete()) + return; + d->updateUnrequestedIndexes(); + + if (d->visibleItems.isEmpty()) { + refill(); + return; + } + + d->moveReason = QDeclarativeListViewPrivate::Other; + FxListItem *firstVisible = d->firstVisibleItem(); + qreal firstItemPos = firstVisible->position(); + QHash moved; + int moveBy = 0; + + QList::Iterator it = d->visibleItems.begin(); + while (it != d->visibleItems.end()) { + FxListItem *item = *it; + if (item->index >= from && item->index < from + count) { + // take the items that are moving + item->index += (to-from); + moved.insert(item->index, item); + if (item->position() < firstItemPos) + moveBy += item->size(); + it = d->visibleItems.erase(it); + } else { + // move everything after the moved items. + if (item->index > from && item->index != -1) + item->index -= count; + ++it; + } + } + + int remaining = count; + int endIndex = d->visibleIndex; + it = d->visibleItems.begin(); + while (it != d->visibleItems.end()) { + FxListItem *item = *it; + if (remaining && item->index >= to && item->index < to + count) { + // place items in the target position, reusing any existing items + FxListItem *movedItem = moved.take(item->index); + if (!movedItem) + movedItem = d->createItem(item->index); + if (item->index <= firstVisible->index) + moveBy -= movedItem->size(); + it = d->visibleItems.insert(it, movedItem); + ++it; + --remaining; + } else { + if (item->index != -1) { + if (item->index >= to) { + // update everything after the moved items. + item->index += count; + } + endIndex = item->index; + } + ++it; + } + } + + // If we have moved items to the end of the visible items + // then add any existing moved items that we have + while (FxListItem *item = moved.take(endIndex+1)) { + d->visibleItems.append(item); + ++endIndex; + } + + // update visibleIndex + for (it = d->visibleItems.begin(); it != d->visibleItems.end(); ++it) { + if ((*it)->index != -1) { + d->visibleIndex = (*it)->index; + break; + } + } + + // Fix current index + if (d->currentIndex >= 0 && d->currentItem) { + int oldCurrent = d->currentIndex; + d->currentIndex = d->model->indexOf(d->currentItem->item, this); + if (oldCurrent != d->currentIndex) { + d->currentItem->index = d->currentIndex; + emit currentIndexChanged(); + } + } + + // Whatever moved items remain are no longer visible items. + while (moved.count()) { + int idx = moved.begin().key(); + FxListItem *item = moved.take(idx); + if (item->item == d->currentItem->item) + item->setPosition(d->positionAt(idx)); + d->releaseItem(item); + } + + // Ensure we don't cause an ugly list scroll. + d->visibleItems.first()->setPosition(d->visibleItems.first()->position() + moveBy); + + d->layout(); +} + +void QDeclarativeListView::modelReset() +{ + Q_D(QDeclarativeListView); + d->clear(); + d->setPosition(0); + refill(); + d->moveReason = QDeclarativeListViewPrivate::SetIndex; + d->updateCurrent(d->currentIndex); + emit countChanged(); +} + +void QDeclarativeListView::createdItem(int index, QDeclarativeItem *item) +{ + Q_D(QDeclarativeListView); + if (d->requestedIndex != index) { + item->setParentItem(viewport()); + d->unrequestedItems.insert(item, index); + if (d->orient == QDeclarativeListView::Vertical) + item->setY(d->positionAt(index)); + else + item->setX(d->positionAt(index)); + } +} + +void QDeclarativeListView::destroyingItem(QDeclarativeItem *item) +{ + Q_D(QDeclarativeListView); + d->unrequestedItems.remove(item); +} + +void QDeclarativeListView::animStopped() +{ + Q_D(QDeclarativeListView); + d->bufferMode = QDeclarativeListViewPrivate::NoBuffer; + if (d->haveHighlightRange && d->highlightRange == QDeclarativeListView::StrictlyEnforceRange) + d->updateHighlight(); +} + +QDeclarativeListViewAttached *QDeclarativeListView::qmlAttachedProperties(QObject *obj) +{ + return new QDeclarativeListViewAttached(obj); +} + +QT_END_NAMESPACE