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Diffstat (limited to 'src/declarative/items/qquicklistview.cpp')
| -rw-r--r-- | src/declarative/items/qquicklistview.cpp | 2533 |
1 files changed, 0 insertions, 2533 deletions
diff --git a/src/declarative/items/qquicklistview.cpp b/src/declarative/items/qquicklistview.cpp deleted file mode 100644 index 86af39075a..0000000000 --- a/src/declarative/items/qquicklistview.cpp +++ /dev/null @@ -1,2533 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2011 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. -** -** $QT_BEGIN_LICENSE:LGPL$ -** 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 <QtDeclarative/qdeclarativeexpression.h> -#include <QtDeclarative/qdeclarativeengine.h> -#include <QtDeclarative/qdeclarativeinfo.h> -#include <QtGui/qevent.h> -#include <QtCore/qmath.h> -#include <QtCore/qcoreapplication.h> - -#include <private/qdeclarativesmoothedanimation_p_p.h> -#include <private/qlistmodelinterface_p.h> -#include "qplatformdefs.h" - -QT_BEGIN_NAMESPACE - -#ifndef QML_FLICK_SNAPONETHRESHOLD -#define QML_FLICK_SNAPONETHRESHOLD 30 -#endif - -class FxListItemSG; - -class QQuickListViewPrivate : public QQuickItemViewPrivate -{ - Q_DECLARE_PUBLIC(QQuickListView) -public: - static QQuickListViewPrivate* get(QQuickListView *item) { return item->d_func(); } - - virtual Qt::Orientation layoutOrientation() const; - virtual bool isContentFlowReversed() const; - bool isRightToLeft() 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 void releaseItem(FxViewItem *item); - virtual void repositionPackageItemAt(QQuickItem *item, int index); - virtual void resetItemPosition(FxViewItem *item, FxViewItem *toItem); - virtual void resetFirstItemPosition(); - virtual void moveItemBy(FxViewItem *item, qreal forwards, qreal backwards); - - virtual void createHighlight(); - virtual void updateHighlight(); - virtual void resetHighlightPosition(); - - virtual void setPosition(qreal pos); - virtual void layoutVisibleItems(); - bool applyInsertionChange(const QDeclarativeChangeSet::Insert &, FxViewItem *firstVisible, InsertionsResult *); - - 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, - QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity); - - QQuickListView::Orientation orient; - qreal visiblePos; - qreal averageSize; - 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) - {} - - 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(QDeclarativeComponent *delegate) -{ - 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) : FxViewItem(i, own), section(0), view(v) { - attached = static_cast<QQuickListViewAttached*>(qmlAttachedPropertiesObject<QQuickListView>(item)); - if (attached) - static_cast<QQuickListViewAttached*>(attached)->setView(view); - } - - ~FxListItemSG() {} - - qreal position() const { - if (section) { - if (view->orientation() == QQuickListView::Vertical) - return 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 item->y(); - else - return (view->effectiveLayoutDirection() == Qt::RightToLeft ? -item->width()-item->x() : item->x()); - } - 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 item->y() + item->height(); - } else { - return (view->effectiveLayoutDirection() == Qt::RightToLeft - ? -item->x() - : item->x() + item->width()); - } - } - void setPosition(qreal pos) { - if (view->orientation() == QQuickListView::Vertical) { - if (section) { - section->setY(pos); - pos += section->height(); - } - item->setY(pos); - } else { - if (view->effectiveLayoutDirection() == Qt::RightToLeft) { - if (section) { - section->setX(-section->width()-pos); - pos += section->width(); - } - item->setX(-item->width()-pos); - } else { - if (section) { - section->setX(pos); - pos += section->width(); - } - item->setX(pos); - } - } - } - 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 >= item->x() && x < item->x() + item->width() && - y >= item->y() && y < item->y() + item->height()); - } - - QQuickItem *section; - QQuickListView *view; -}; - -//---------------------------------------------------------------------------- - -bool QQuickListViewPrivate::isContentFlowReversed() const -{ - return isRightToLeft(); -} - -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; -} - -// 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) { - q->QQuickFlickable::setContentY(pos); - } else { - if (isRightToLeft()) - q->QQuickFlickable::setContentX(-pos-size()); - else - q->QQuickFlickable::setContentX(pos); - } -} - -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) -{ - 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; - currentSectionItem = 0; - nextSectionItem = 0; - lastVisibleSection = QString(); - QQuickItemViewPrivate::clear(); -} - -FxViewItem *QQuickListViewPrivate::newViewItem(int modelIndex, QQuickItem *item) -{ - Q_Q(QQuickListView); - - FxListItemSG *listItem = new FxListItemSG(item, q, 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 (item->attached->m_prevSection != item->attached->m_section) - updateInlineSection(static_cast<FxListItemSG*>(item)); - } -} - -void QQuickListViewPrivate::releaseItem(FxViewItem *item) -{ - if (item) { - FxListItemSG* listItem = static_cast<FxListItemSG*>(item); - if (listItem->section) { - int i = 0; - do { - if (!sectionCache[i]) { - sectionCache[i] = listItem->section; - sectionCache[i]->setVisible(false); - listItem->section = 0; - break; - } - ++i; - } while (i < sectionCacheSize); - delete listItem->section; - } - } - QQuickItemViewPrivate::releaseItem(item); -} - -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); - for (int i = 0; i < visibleItems.count(); ++i) - releaseItem(visibleItems.at(i)); - visibleItems.clear(); - modelIndex += count; - if (modelIndex >= model->count()) { - count -= modelIndex - model->count() + 1; - modelIndex = model->count() - 1; - } else if (modelIndex < 0) { - count -= modelIndex; - modelIndex = 0; - } - visibleIndex = modelIndex; - visiblePos = itemEnd + count * (averageSize + spacing); - itemEnd = visiblePos; - } - - bool changed = false; - FxListItemSG *item = 0; - qreal pos = itemEnd; - while (modelIndex < model->count() && pos <= fillTo) { -// qDebug() << "refill: append item" << modelIndex << "pos" << pos; - if (!(item = static_cast<FxListItemSG*>(createItem(modelIndex, doBuffer)))) - break; - item->setPosition(pos); - item->item->setVisible(!doBuffer); - pos += item->size() + spacing; - visibleItems.append(item); - ++modelIndex; - changed = true; - } - while (visibleIndex > 0 && visibleIndex <= model->count() && visiblePos > fillFrom) { -// qDebug() << "refill: prepend item" << visibleIndex-1 << "current top pos" << visiblePos; - if (!(item = static_cast<FxListItemSG*>(createItem(visibleIndex-1, doBuffer)))) - break; - --visibleIndex; - visiblePos -= item->size() + spacing; - item->setPosition(visiblePos); - item->item->setVisible(!doBuffer); - visibleItems.prepend(item); - changed = true; - } - - return changed; -} - -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) { -// qDebug() << "refill: remove first" << visibleIndex << "top end pos" << item->endPosition(); - - // remove this item and all zero-sized items before it - while (item) { - if (item->index != -1) - visibleIndex++; - visibleItems.removeAt(index); - 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; -// qDebug() << "refill: remove last" << visibleIndex+visibleItems.count()-1 << item->position(); - visibleItems.removeLast(); - releaseItem(item); - changed = true; - } - - return changed; -} - -void QQuickListViewPrivate::visibleItemsChanged() -{ - if (visibleItems.count()) - visiblePos = (*visibleItems.constBegin())->position(); - updateAverage(); - if (currentIndex >= 0 && currentItem && !visibleItem(currentIndex)) { - static_cast<FxListItemSG*>(currentItem)->setPosition(positionAt(currentIndex)); - updateHighlight(); - } - if (sectionCriteria) - updateCurrentSection(); - updateHeader(); - updateFooter(); - updateViewport(); - updateUnrequestedPositions(); -} - -void QQuickListViewPrivate::layoutVisibleItems() -{ - if (!visibleItems.isEmpty()) { - bool fixedCurrent = currentItem && (*visibleItems.constBegin())->item == currentItem->item; - qreal sum = (*visibleItems.constBegin())->size(); - qreal pos = (*visibleItems.constBegin())->position() + (*visibleItems.constBegin())->size() + spacing; - for (int i=1; i < visibleItems.count(); ++i) { - FxListItemSG *item = static_cast<FxListItemSG*>(visibleItems.at(i)); - item->setPosition(pos); - 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::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()) - 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::resetItemPosition(FxViewItem *item, FxViewItem *toItem) -{ - if (item == toItem) - return; - static_cast<FxListItemSG*>(item)->setPosition(toItem->position()); -} - -void QQuickListViewPrivate::resetFirstItemPosition() -{ - FxListItemSG *item = static_cast<FxListItemSG*>(visibleItems.first()); - item->setPosition(0); -} - -void QQuickListViewPrivate::moveItemBy(FxViewItem *item, qreal forwards, qreal backwards) -{ - qreal diff = forwards - backwards; - static_cast<FxListItemSG*>(item)->setPosition(item->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); - - 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(q); - highlightPosAnimator->target = QDeclarativeProperty(item, posProp); - highlightPosAnimator->velocity = highlightMoveSpeed; - highlightPosAnimator->userDuration = highlightMoveDuration; - - const QLatin1String sizeProp(orient == QQuickListView::Vertical ? "height" : "width"); - highlightSizeAnimator = new QSmoothedAnimation(q); - highlightSizeAnimator->velocity = highlightResizeSpeed; - highlightSizeAnimator->userDuration = highlightResizeDuration; - highlightSizeAnimator->target = QDeclarativeProperty(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 = isRightToLeft() - ? -listItem->itemPosition()-listItem->itemSize() - : listItem->itemPosition(); - highlightSizeAnimator->to = listItem->itemSize(); - 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); - QDeclarativeContext *context = QDeclarativeEngine::contextForObject(sectionItem)->parentContext(); - context->setContextProperty(QLatin1String("section"), section); - } else { - QDeclarativeContext *creationContext = sectionCriteria->delegate()->creationContext(); - QDeclarativeContext *context = new QDeclarativeContext( - creationContext ? creationContext : qmlContext(q)); - context->setContextProperty(QLatin1String("section"), section); - QObject *nobj = sectionCriteria->delegate()->beginCreate(context); - if (nobj) { - QDeclarative_setParent_noEvent(context, nobj); - sectionItem = qobject_cast<QQuickItem *>(nobj); - if (!sectionItem) { - delete nobj; - } else { - sectionItem->setZ(2); - QDeclarative_setParent_noEvent(sectionItem, contentItem); - sectionItem->setParentItem(contentItem); - } - } else { - delete context; - } - sectionCriteria->delegate()->completeCreate(); - } - - return sectionItem; -} - -void QQuickListViewPrivate::releaseSectionItem(QQuickItem *item) -{ - int i = 0; - do { - if (!sectionCache[i]) { - sectionCache[i] = item; - sectionCache[i]->setVisible(false); - return; - } - ++i; - } while (i < sectionCacheSize); - delete item; -} - -void QQuickListViewPrivate::updateInlineSection(FxListItemSG *listItem) -{ - if (!sectionCriteria || !sectionCriteria->delegate()) - return; - if (listItem->attached->m_prevSection != listItem->attached->m_section - && (sectionCriteria->labelPositioning() & QQuickViewSection::InlineLabels - || (listItem->index == 0 && sectionCriteria->labelPositioning() & QQuickViewSection::CurrentLabelAtStart))) { - if (!listItem->section) { - qreal pos = listItem->position(); - listItem->section = getSectionItem(listItem->attached->m_section); - listItem->setPosition(pos); - } else { - QDeclarativeContext *context = QDeclarativeEngine::contextForObject(listItem->section)->parentContext(); - context->setContextProperty(QLatin1String("section"), listItem->attached->m_section); - } - } else if (listItem->section) { - qreal pos = listItem->position(); - releaseSectionItem(listItem->section); - listItem->section = 0; - listItem->setPosition(pos); - } -} - -void QQuickListViewPrivate::updateStickySections() -{ - if (!sectionCriteria || visibleItems.isEmpty() - || (!sectionCriteria->labelPositioning() && !currentSectionItem && !nextSectionItem)) - return; - - bool isRtl = isRightToLeft(); - qreal viewPos = isRightToLeft() ? -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 = isRtl ? -sectionPos-sectionSize >= viewPos : sectionPos >= viewPos; - bool visBot = true; - if (sectionCriteria->labelPositioning() & QQuickViewSection::NextLabelAtEnd) - visBot = isRtl ? -sectionPos <= viewPos + size() : sectionPos + sectionSize < viewPos + size(); - section->setVisible(visBot && visTop); - if (visTop && !sectionItem) - sectionItem = section; - if (isRtl) { - if (-sectionPos <= viewPos + size()) - lastSectionItem = section; - } else { - if (sectionPos + sectionSize < viewPos + size()) - lastSectionItem = section; - } - } - ++index; - } - - // Current section header - if (sectionCriteria->labelPositioning() & QQuickViewSection::CurrentLabelAtStart) { - if (!currentSectionItem) { - currentSectionItem = getSectionItem(currentSection); - } else if (currentStickySection != currentSection) { - QDeclarativeContext *context = QDeclarativeEngine::contextForObject(currentSectionItem)->parentContext(); - context->setContextProperty(QLatin1String("section"), currentSection); - } - currentStickySection = currentSection; - if (!currentSectionItem) - return; - - qreal sectionSize = orient == QQuickListView::Vertical ? currentSectionItem->height() : currentSectionItem->width(); - bool atBeginning = orient == QQuickListView::Vertical ? vData.atBeginning : (isRightToLeft() ? hData.atEnd : hData.atBeginning); - currentSectionItem->setVisible(!atBeginning && (!header || header->endPosition() < viewPos)); - qreal pos = isRtl ? position() + size() - sectionSize : viewPos; - if (sectionItem) { - qreal sectionPos = orient == QQuickListView::Vertical ? sectionItem->y() : sectionItem->x(); - pos = isRtl ? qMax(pos, sectionPos + sectionSize) : qMin(pos, sectionPos - sectionSize); - } - if (header) - pos = isRtl ? qMin(header->endPosition(), pos) : qMax(header->endPosition(), pos); - if (footer) - pos = isRtl ? 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) { - if (!nextSectionItem) { - nextSectionItem = getSectionItem(nextSection); - } else if (nextStickySection != nextSection) { - QDeclarativeContext *context = QDeclarativeEngine::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 = isRtl ? position() : viewPos + size() - sectionSize; - if (lastSectionItem) { - qreal sectionPos = orient == QQuickListView::Vertical ? lastSectionItem->y() : lastSectionItem->x(); - pos = isRtl ? qMin(pos, sectionPos - sectionSize) : qMax(pos, sectionPos + sectionSize); - } - if (header) - pos = isRtl ? 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()) { - QString prevSection; - if (visibleIndex > 0) - 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 = isRightToLeft() ? -position() : position() + size(); - 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); - - 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)); - } - - // Avoid showing section delegate twice. We still need the section heading so that - // currentItem positioning works correctly. - // This is slightly sub-optimal, but section heading caching minimizes the impact. - if (listItem->section) - listItem->section->setVisible(false); - - 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 -{ - 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, true); - if (!item) - return; - item->setZ(1); - footer = new FxListItemSG(item, q, 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, true); - if (!item) - return; - item->setZ(1); - header = new FxListItemSG(item, q, 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(); -} - -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())) { - 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 = isRightToLeft() ? -position()-size() : position(); - - if (snapMode != QQuickListView::NoSnap && moveReason != QQuickListViewPrivate::SetIndex) { - qreal tempPosition = isRightToLeft() ? -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 (isRightToLeft()) - bias = -bias; - 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 = isRightToLeft() ? - header->position() + highlightRangeStart - size() : header->position() - highlightRangeStart; - } else { - if (isRightToLeft()) - pos = qMax(qMin(-topItem->position() + highlightRangeStart - size(), -maxExtent), -minExtent); - else - pos = qMax(qMin(topItem->position() - highlightRangeStart, -maxExtent), -minExtent); - } - } else if (bottomItem && isInBounds) { - if (isRightToLeft()) - 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 (isRightToLeft()) - 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; - fixupMode = Normal; -} - -void QQuickListViewPrivate::flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize, - QDeclarativeTimeLineCallback::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 = isRightToLeft() ? -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 (isRightToLeft()) - 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 (isRightToLeft()) - 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; - 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 = isRightToLeft() ? -dist : dist; - data.flickTarget = -snapPosAt(-(dataValue - highlightRangeStart) + distTemp) + highlightRangeStart; - } - data.flickTarget = isRightToLeft() ? -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(QDeclarativeTimeLineCallback(&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 = isRightToLeft() ? -data.flickTarget+size() : data.flickTarget; - newtarget = -snapPosAt(-(tempFlickTarget - highlightRangeStart)) + highlightRangeStart; - newtarget = isRightToLeft() ? -newtarget+size() : newtarget; - } - 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(QDeclarativeTimeLineCallback(&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 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 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 doc/src/snippets/declarative/listview/ContactModel.qml 0 - - Another component can display this model data in a ListView, like this: - - \snippet doc/src/snippets/declarative/listview/listview.qml import - \codeline - \snippet doc/src/snippets/declarative/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 doc/src/snippets/declarative/listview/listview.qml classdocs advanced - \image listview-highlight.png - - 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 doc/src/snippets/declarative/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. - - \sa {QML Data Models}, GridView, {declarative/modelviews/listview}{ListView examples} -*/ -QQuickListView::QQuickListView(QQuickItem *parent) - : QQuickItemView(*(new QQuickListViewPrivate), parent) -{ -} - -QQuickListView::~QQuickListView() -{ -} - -/*! - \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 doc/src/snippets/declarative/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. - - 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 QtQuick2::ListView::onAdd() - This attached handler is called immediately after an item is added to the view. -*/ - -/*! - \qmlattachedsignal QtQuick2::ListView::onRemove() - This attached handler is called immediately before an item is removed from the view. -*/ - -/*! - \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. -*/ - -/*! - \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 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 -*/ -//###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 - \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 -*/ -void QQuickListView::setHighlightFollowsCurrentItem(bool autoHighlight) -{ - Q_D(QQuickListView); - if (d->autoHighlight != autoHighlight) { - if (!autoHighlight) { - if (d->highlightPosAnimator) - 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; - d->layout(); - emit spacingChanged(); - } -} - -/*! - \qmlproperty enumeration QtQuick2::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 -*/ -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); - setFlickableDirection(HorizontalFlick); - setContentY(0); - } - d->regenerate(); - emit orientationChanged(); - } -} - -/*! - \qmlproperty enumeration QtQuick2::ListView::layoutDirection - This property holds the layout direction of the horizontal list. - - Possible values: - - \list - \o Qt.LeftToRight (default) - Items will be laid out from left to right. - \o Qt.RightToLeft - Items will be laid out from right to let. - \endlist - - \sa ListView::effectiveLayoutDirection -*/ - - -/*! - \qmlproperty enumeration QtQuick2::ListView::effectiveLayoutDirection - This property holds the effective layout direction of the horizontal 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 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. - - 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 - \o ViewSection.FullString (default) - sections are created based on the - \c section.property value. - \o 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 - - \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 - \o ViewSection.InlineLabels - section labels are shown inline between - the item delegates separating sections (default). - \o ViewSection.CurrentLabelAtStart - the current section label sticks to the - start of the view as it is moved. - \o 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 - delegate component provides the light blue bar that marks the beginning of - each section. - - - \snippet examples/declarative/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(); - } -} - -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 - \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 -*/ -QQuickListView::SnapMode QQuickListView::snapMode() const -{ - 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 -*/ - - -/*! - \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 -*/ - -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; - - // 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 (yflick()) - d->bufferMode = d->vData.smoothVelocity < 0 ? QQuickListViewPrivate::BufferBefore : QQuickListViewPrivate::BufferAfter; - else 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->refill(); - 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->isRightToLeft() ? -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(); - 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 && 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 == QQuickListView::Horizontal && !d->isRightToLeft() && event->key() == Qt::Key_Right) - || (d->orient == QQuickListView::Horizontal && d->isRightToLeft() && event->key() == Qt::Key_Left) - || (d->orient == QQuickListView::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(); - QQuickItemView::keyPressEvent(event); -} - -void QQuickListView::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) -{ - Q_D(QQuickListView); - if (d->isRightToLeft() && d->orient == QQuickListView::Horizontal) { - // maintain position relative to the right edge - int dx = newGeometry.width() - oldGeometry.width(); - setContentX(contentX() - dx); - } - 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. - - \bold 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. - - \bold 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; - d->layout(); - } - } -} - -bool QQuickListViewPrivate::applyInsertionChange(const QDeclarativeChangeSet::Insert &change, FxViewItem *firstVisible, InsertionsResult *insertResult) -{ - int modelIndex = change.index; - int count = change.count; - - - qreal tempPos = isRightToLeft() ? -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 { - 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 prevAddedCount = insertResult->addedItems.count(); - if (firstVisible && pos < firstVisible->position()) { - // 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->sizeAddedBeforeVisible += 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)))) { - if (item->index > modelIndex + i) - insertResult->movedBackwards.append(item); - item->index = modelIndex + i; - } - if (!item) - item = createItem(modelIndex + i); - if (!item) - return false; - - visibleItems.insert(insertionIdx, item); - if (!change.isMove()) { - insertResult->addedItems.append(item); - insertResult->sizeAddedBeforeVisible += item->size(); - } - 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)))) { - if (item->index > modelIndex + i) - insertResult->movedBackwards.append(item); - item->index = modelIndex + i; - } - if (!item) - item = createItem(modelIndex + i); - if (!item) - return false; - - visibleItems.insert(index, item); - if (!change.isMove()) - insertResult->addedItems.append(item); - pos += item->size() + spacing; - ++index; - } - } - - for (; index < visibleItems.count(); ++index) { - FxViewItem *item = visibleItems.at(index); - if (item->index != -1) - item->index += count; - } - - updateVisibleIndex(); - - return insertResult->addedItems.count() > prevAddedCount; -} - - -/*! - \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 - \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. - - \bold 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. - - \bold 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. - - \bold Note: methods should only be called after the Component has completed. -*/ - -QQuickListViewAttached *QQuickListView::qmlAttachedProperties(QObject *obj) -{ - return new QQuickListViewAttached(obj); -} - -QT_END_NAMESPACE |