/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Qt Software Information (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 either Technology Preview License Agreement or the ** Beta Release License Agreement. ** ** 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 1.0, 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. ** ** If you are unsure which license is appropriate for your use, please ** contact the sales department at qt-sales@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "private/qfxflickable_p.h" #include "qmlfollow.h" #include "qlistmodelinterface.h" #include "qfxvisualitemmodel.h" #include "qfxlistview.h" #include #include QT_BEGIN_NAMESPACE class QFxListViewAttached : public QObject { Q_OBJECT public: QFxListViewAttached(QObject *parent) : QObject(parent), m_isCurrent(false), m_delayRemove(false) {} ~QFxListViewAttached() { attachedProperties.remove(parent()); } Q_PROPERTY(QFxListView *view READ view) QFxListView *view() { return m_view; } Q_PROPERTY(bool isCurrentItem READ isCurrentItem NOTIFY currentItemChanged) bool isCurrentItem() const { return m_isCurrent; } void setIsCurrentItem(bool c) { if (m_isCurrent != c) { m_isCurrent = c; emit currentItemChanged(); } } Q_PROPERTY(QString prevSection READ prevSection NOTIFY prevSectionChanged) QString prevSection() const { return m_prevSection; } void setPrevSection(const QString §) { if (m_prevSection != sect) { m_prevSection = sect; emit prevSectionChanged(); } } Q_PROPERTY(QString section READ section NOTIFY sectionChanged) QString section() const { return m_section; } void setSection(const QString §) { if (m_section != sect) { m_section = sect; emit sectionChanged(); } } Q_PROPERTY(bool delayRemove READ delayRemove WRITE setDelayRemove NOTIFY delayRemoveChanged) bool delayRemove() const { return m_delayRemove; } void setDelayRemove(bool delay) { if (m_delayRemove != delay) { m_delayRemove = delay; emit delayRemoveChanged(); } } static QFxListViewAttached *properties(QObject *obj) { QFxListViewAttached *rv = attachedProperties.value(obj); if (!rv) { rv = new QFxListViewAttached(obj); attachedProperties.insert(obj, rv); } return rv; } void emitAdd() { emit add(); } void emitRemove() { emit remove(); } signals: void currentItemChanged(); void sectionChanged(); void prevSectionChanged(); void delayRemoveChanged(); void add(); void remove(); public: QFxListView *m_view; bool m_isCurrent; mutable QString m_section; QString m_prevSection; bool m_delayRemove; static QHash attachedProperties; }; QHash QFxListViewAttached::attachedProperties; //---------------------------------------------------------------------------- class FxListItem { public: FxListItem(QFxItem *i, QFxListView *v) : item(i), view(v) { attached = QFxListViewAttached::properties(item); attached->m_view = view; } ~FxListItem() {} qreal position() const { return (view->orientation() == Qt::Vertical ? item->y() : item->x()); } int size() const { return (view->orientation() == Qt::Vertical ? item->height() : item->width()); } qreal endPosition() const { return (view->orientation() == Qt::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() == Qt::Vertical) { item->setY(pos); } else { item->setX(pos); } } QFxItem *item; QFxListView *view; QFxListViewAttached *attached; int index; }; //---------------------------------------------------------------------------- class QFxListViewPrivate : public QFxFlickablePrivate { Q_DECLARE_PUBLIC(QFxListView); public: QFxListViewPrivate() : model(0), currentItem(0), tmpCurrent(0), orient(Qt::Vertical) , visiblePos(0), visibleIndex(0) , averageSize(100), currentIndex(-1), requestedIndex(-1) , currItemMode(QFxListView::Free), snapPos(0), highlightComponent(0), highlight(0), trackedItem(0) , moveReason(Other), buffer(0), highlightPosAnimator(0), highlightSizeAnimator(0) , keyPressed(false), ownModel(false), wrap(false), autoHighlight(true) , fixCurrentVisibility(false) {} 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; } qreal position() const { Q_Q(const QFxListView); return orient == Qt::Vertical ? q->yPosition() : q->xPosition(); } void setPosition(qreal pos) { Q_Q(QFxListView); if (orient == Qt::Vertical) q->setYPosition(pos); else q->setXPosition(pos); } int size() const { Q_Q(const QFxListView); return orient == Qt::Vertical ? q->height() : q->width(); } qreal startPosition() const { qreal pos = 0; if (!visibleItems.isEmpty()) pos = visibleItems.first()->position() - visibleIndex * averageSize; 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.last()->endPosition() + invisibleCount * averageSize; } 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.first()->position() - count * averageSize; } 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.last()->endPosition() + count * averageSize + 1; } } return 0; } QString sectionAt(int modelIndex) { Q_Q(QFxListView); if (FxListItem *item = visibleItem(modelIndex)) return item->attached->section(); QString section; if (!sectionExpression.isEmpty()) section = model->evaluate(modelIndex, sectionExpression, q).toString(); return section; } bool isValid() const { return model && model->count() && (!ownModel || model->delegate()); } int snapIndex() { qreal pos = position(); for (int i = 0; i < visibleItems.count(); ++i) { qreal itemTop = visibleItems[i]->position() - pos; if (itemTop >= snapPos-averageSize/2 && itemTop < snapPos+averageSize/2) return visibleItems[i]->index; } return -1; } // 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; } // 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); void layout(); void updateUnrequestedIndexes(); void updateUnrequestedPositions(); void updateTrackedItem(); void createHighlight(); void updateHighlight(); void updateSections(); void updateCurrentSection(); void updateCurrent(int); void updateAverage(); void fixupPosition(); virtual void fixupY(); virtual void fixupX(); QFxVisualItemModel *model; QVariant modelVariant; QList visibleItems; QHash unrequestedItems; FxListItem *currentItem; QFxItem *tmpCurrent; Qt::Orientation orient; int visiblePos; int visibleIndex; qreal averageSize; int currentIndex; int requestedIndex; QFxListView::CurrentItemPositioning currItemMode; int snapPos; QmlComponent *highlightComponent; FxListItem *highlight; FxListItem *trackedItem; QFxItem *activeItem; //XXX fix enum MovementReason { Other, Key, Mouse }; MovementReason moveReason; int buffer; QmlFollow *highlightPosAnimator; QmlFollow *highlightSizeAnimator; QString sectionExpression; QString currentSection; int keyPressed : 1; int ownModel : 1; int wrap : 1; int autoHighlight : 1; int fixCurrentVisibility : 1; }; void QFxListViewPrivate::init() { Q_Q(QFxListView); q->setOptions(QFxListView::IsFocusRealm); QObject::connect(q, SIGNAL(heightChanged()), q, SLOT(refill())); QObject::connect(q, SIGNAL(widthChanged()), q, SLOT(refill())); } void QFxListViewPrivate::clear() { for (int i = 0; i < visibleItems.count(); ++i) releaseItem(visibleItems.at(i)); visibleItems.clear(); visiblePos = 0; visibleIndex = 0; releaseItem(currentItem); currentItem = 0; currentIndex = -1; createHighlight(); trackedItem = 0; } FxListItem *QFxListViewPrivate::createItem(int modelIndex) { Q_Q(QFxListView); // create object requestedIndex = modelIndex; FxListItem *listItem = 0; if (QFxItem *item = model->item(modelIndex, false)) { listItem = new FxListItem(item, q); listItem->index = modelIndex; // initialise attached properties if (!sectionExpression.isEmpty()) { QmlExpression e(qmlContext(listItem->item), sectionExpression, q); e.setTrackChange(false); listItem->attached->m_section = e.value().toString(); if (modelIndex > 0) { if (FxListItem *item = visibleItem(modelIndex-1)) listItem->attached->m_prevSection = item->attached->section(); else listItem->attached->m_prevSection = sectionAt(modelIndex-1); } } // complete model->completeItem(); listItem->item->setZ(modelIndex + 1); listItem->item->setParent(q->viewport()); if (orient == Qt::Vertical) QObject::connect(listItem->item, SIGNAL(heightChanged()), q, SLOT(itemResized())); else QObject::connect(listItem->item, SIGNAL(widthChanged()), q, SLOT(itemResized())); } requestedIndex = -1; return listItem; } void QFxListViewPrivate::releaseItem(FxListItem *item) { Q_Q(QFxListView); if (!item) return; if (orient == Qt::Vertical) QObject::disconnect(item->item, SIGNAL(heightChanged()), q, SLOT(itemResized())); else QObject::disconnect(item->item, SIGNAL(widthChanged()), q, SLOT(itemResized())); if (trackedItem == item) { const char *notifier1 = orient == Qt::Vertical ? SIGNAL(yChanged()) : SIGNAL(xChanged()); const char *notifier2 = orient == Qt::Vertical ? SIGNAL(heightChanged()) : SIGNAL(widthChanged()); QObject::disconnect(trackedItem->item, notifier1, q, SLOT(trackedPositionChanged())); QObject::disconnect(trackedItem->item, notifier2, q, SLOT(trackedPositionChanged())); trackedItem = 0; } 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)); } delete item; } void QFxListViewPrivate::refill(qreal from, qreal to) { Q_Q(QFxListView); if (!isValid() || !q->isComponentComplete()) return; from -= buffer; to += buffer; int modelIndex = 0; qreal itemEnd = visiblePos-1; if (!visibleItems.isEmpty()) { visiblePos = visibleItems.first()->position(); itemEnd = visibleItems.last()->endPosition(); 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 <= to) { //qDebug() << "refill: append item" << modelIndex; if (!(item = createItem(modelIndex))) break; item->setPosition(pos); pos += item->size(); visibleItems.append(item); ++modelIndex; changed = true; } while (visibleIndex > 0 && visibleIndex <= model->count() && visiblePos > from) { //qDebug() << "refill: prepend item" << visibleIndex-1 << "current top pos" << visiblePos; if (!(item = createItem(visibleIndex-1))) break; --visibleIndex; visiblePos -= item->size(); item->setPosition(visiblePos); visibleItems.prepend(item); changed = true; } while (visibleItems.count() > 1 && (item = visibleItems.first()) && item->endPosition() < from) { 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() > to) { if (item->attached->delayRemove()) break; //qDebug() << "refill: remove last" << visibleIndex+visibleItems.count()-1; visibleItems.removeLast(); releaseItem(item); changed = true; } if (changed) { if (visibleItems.count()) visiblePos = visibleItems.first()->position(); updateAverage(); if (!sectionExpression.isEmpty()) updateCurrentSection(); if (orient == Qt::Vertical) q->setViewportHeight(endPosition() - startPosition()); else q->setViewportWidth(endPosition() - startPosition()); } } void QFxListViewPrivate::layout() { Q_Q(QFxListView); if (!visibleItems.isEmpty()) { int oldEnd = visibleItems.last()->endPosition(); int pos = visibleItems.first()->endPosition() + 1; for (int i=1; i < visibleItems.count(); ++i) { FxListItem *item = visibleItems.at(i); item->setPosition(pos); pos += item->size(); } // move current item if it is after the visible items. if (currentItem && currentIndex > visibleItems.last()->index) currentItem->setPosition(currentItem->position() + (visibleItems.last()->endPosition() - oldEnd)); } if (!isValid()) return; q->refill(); q->trackedPositionChanged(); updateHighlight(); if (orient == Qt::Vertical) { fixupY(); q->setViewportHeight(endPosition() - startPosition()); } else { fixupX(); q->setViewportWidth(endPosition() - startPosition()); } updateUnrequestedPositions(); } void QFxListViewPrivate::updateUnrequestedIndexes() { Q_Q(QFxListView); QHash::iterator it; for (it = unrequestedItems.begin(); it != unrequestedItems.end(); ++it) *it = model->indexOf(it.key(), q); } void QFxListViewPrivate::updateUnrequestedPositions() { QHash::const_iterator it; for (it = unrequestedItems.begin(); it != unrequestedItems.end(); ++it) { if (visibleItem(*it)) continue; if (orient == Qt::Vertical) it.key()->setY(positionAt(*it)); else it.key()->setX(positionAt(*it)); } } void QFxListViewPrivate::updateTrackedItem() { Q_Q(QFxListView); FxListItem *item = currentItem; if (highlight) item = highlight; const char *notifier1 = orient == Qt::Vertical ? SIGNAL(yChanged()) : SIGNAL(xChanged()); const char *notifier2 = orient == Qt::Vertical ? SIGNAL(heightChanged()) : SIGNAL(widthChanged()); if (trackedItem && item != trackedItem) { QObject::disconnect(trackedItem->item, notifier1, q, SLOT(trackedPositionChanged())); QObject::disconnect(trackedItem->item, notifier2, q, SLOT(trackedPositionChanged())); trackedItem = 0; } if (!trackedItem && item) { trackedItem = item; QObject::connect(trackedItem->item, notifier1, q, SLOT(trackedPositionChanged())); QObject::connect(trackedItem->item, notifier2, q, SLOT(trackedPositionChanged())); q->trackedPositionChanged(); } if (trackedItem) q->trackedPositionChanged(); } void QFxListViewPrivate::createHighlight() { Q_Q(QFxListView); if (highlight) { if (trackedItem == highlight) trackedItem = 0; delete highlight->item; delete highlight; highlight = 0; delete highlightPosAnimator; delete highlightSizeAnimator; highlightPosAnimator = 0; highlightSizeAnimator = 0; } if (currentItem) { QFxItem *item = 0; if (highlightComponent) { QmlContext *highlightContext = new QmlContext(qmlContext(q)); QObject *nobj = highlightComponent->create(highlightContext); if (nobj) { highlightContext->setParent(nobj); item = qobject_cast(nobj); if (!item) { delete nobj; } else { item->setParent(q->viewport()); } } else { delete highlightContext; } } else { item = new QFxItem; item->setParent(q->viewport()); } if (item) { highlight = new FxListItem(item, q); const QLatin1String posProp(orient == Qt::Vertical ? "y" : "x"); highlightPosAnimator = new QmlFollow(q); highlightPosAnimator->setTarget(QmlMetaProperty(highlight->item, posProp)); highlightPosAnimator->setSpring(3); highlightPosAnimator->setDamping(0.3); highlightPosAnimator->setEnabled(autoHighlight); const QLatin1String sizeProp(orient == Qt::Vertical ? "height" : "width"); highlightSizeAnimator = new QmlFollow(q); highlightSizeAnimator->setTarget(QmlMetaProperty(highlight->item, sizeProp)); highlightSizeAnimator->setEnabled(autoHighlight); } } } void QFxListViewPrivate::updateHighlight() { if ((!currentItem && highlight) || (currentItem && !highlight)) createHighlight(); updateTrackedItem(); if (currentItem && autoHighlight && highlight) { // auto-update highlight highlightPosAnimator->setSourceValue(currentItem->position()); highlightSizeAnimator->setSourceValue(currentItem->size()); if (orient == Qt::Vertical) { if (highlight->item->width() == 0) highlight->item->setWidth(currentItem->item->width()); } else { if (highlight->item->height() == 0) highlight->item->setHeight(currentItem->item->height()); } } } void QFxListViewPrivate::updateSections() { if (!sectionExpression.isEmpty()) { QString prevSection; if (visibleIndex > 0) prevSection = sectionAt(visibleIndex-1); for (int i = 0; i < visibleItems.count(); ++i) { QFxListViewAttached *attached = visibleItems.at(i)->attached; attached->setPrevSection(prevSection); prevSection = attached->section(); } } } void QFxListViewPrivate::updateCurrentSection() { if (sectionExpression.isEmpty() || 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 QFxListViewPrivate::updateCurrent(int modelIndex) { Q_Q(QFxListView); if (!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; } if (tmpCurrent) { delete tmpCurrent; tmpCurrent = 0; } FxListItem *oldCurrentItem = currentItem; currentIndex = modelIndex; currentItem = createItem(modelIndex); fixCurrentVisibility = true; 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()); } 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 QFxListViewPrivate::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 QFxListViewPrivate::fixupPosition() { if (orient == Qt::Vertical) fixupY(); else fixupX(); } void QFxListViewPrivate::fixupY() { Q_Q(QFxListView); QFxFlickablePrivate::fixupY(); if (orient == Qt::Horizontal) return; if (currItemMode == QFxListView::SnapAuto) { if (currentItem) { moveReason = Mouse; _tl.clear(); _tl.move(_moveY, -(currentItem->position() - snapPos), QEasingCurve(QEasingCurve::InOutQuad), 200); } } else if (currItemMode == QFxListView::Snap) { moveReason = Mouse; int idx = snapIndex(); if (FxListItem *snapItem = visibleItem(idx)) { int pos = snapItem->position() - snapPos; if (pos > -q->maxYExtent()) pos = -q->maxYExtent(); else if (pos < -q->minYExtent()) pos = -q->minYExtent(); _tl.clear(); _tl.move(_moveY, -(pos), QEasingCurve(QEasingCurve::InOutQuad), 200); } } } void QFxListViewPrivate::fixupX() { Q_Q(QFxListView); QFxFlickablePrivate::fixupX(); if (orient == Qt::Vertical) return; if (currItemMode == QFxListView::SnapAuto) { moveReason = Mouse; _tl.clear(); _tl.move(_moveX, -(currentItem->position() - snapPos), QEasingCurve(QEasingCurve::InOutQuad), 200); } else if (currItemMode == QFxListView::Snap) { moveReason = Mouse; int idx = snapIndex(); if (FxListItem *snapItem = visibleItem(idx)) { int pos = snapItem->position() - snapPos; if (pos > -q->maxXExtent()) pos = -q->maxXExtent(); else if (pos < -q->minXExtent()) pos = -q->minXExtent(); _tl.clear(); _tl.move(_moveX, -(pos), QEasingCurve(QEasingCurve::InOutQuad), 200); } } } //---------------------------------------------------------------------------- /*! \qmlclass ListView \inherits Flickable \brief The ListView item provides a list view of items provided by a model. The model is typically provided by a QAbstractListModel "C++ model object", but can also be created directly in QML. The items are laid out vertically or horizontally and may be flicked to scroll. The below example creates a very simple vertical list, using a QML model. \image trivialListView.png The user interface defines a delegate to display an item, a highlight, and the ListView which uses the above. \snippet doc/src/snippets/declarative/listview/listview.qml 3 The model is defined as a ListModel using QML: \quotefile doc/src/snippets/declarative/listview/dummydata/ContactModel.qml In this case ListModel is a handy way for us to test our UI. In practice the model would be implemented in C++, or perhaps via a SQL data source. */ QFxListView::QFxListView(QFxItem *parent) : QFxFlickable(*(new QFxListViewPrivate), parent) { Q_D(QFxListView); d->init(); } QFxListView::~QFxListView() { Q_D(QFxListView); if (d->ownModel) delete d->model; } /*! \qmlproperty model ListView::model This property holds the model providing data for the list. The model provides a set of data that is used to create the items for the view. For large or dynamic datasets the model is usually provided by a C++ model object. The C++ model object must be a \l {QAbstractItemModel} subclass, a VisualModel, or a simple list. Models can also be created directly in QML, using a \l{ListModel}. */ QVariant QFxListView::model() const { Q_D(const QFxListView); return d->modelVariant; } void QFxListView::setModel(const QVariant &model) { Q_D(QFxListView); 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(createdItem(int, QFxItem*)), this, SLOT(createdItem(int,QFxItem*))); disconnect(d->model, SIGNAL(destroyingItem(QFxItem*)), this, SLOT(destroyingItem(QFxItem*))); } d->clear(); d->modelVariant = model; QObject *object = qvariant_cast(model); QFxVisualItemModel *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 QFxVisualItemModel(qmlContext(this)); d->ownModel = true; } d->model->setModel(model); } if (d->model) { if (d->currentIndex >= d->model->count() || d->currentIndex < 0) setCurrentIndex(0); else 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(createdItem(int, QFxItem*)), this, SLOT(createdItem(int,QFxItem*))); connect(d->model, SIGNAL(destroyingItem(QFxItem*)), this, SLOT(destroyingItem(QFxItem*))); refill(); emit countChanged(); } } /*! \qmlproperty component ListView::delegate The delegate provides a template describing what each item in the view should look and act like. Here is an example delegate: \snippet doc/src/snippets/declarative/listview/listview.qml 0 */ QmlComponent *QFxListView::delegate() const { Q_D(const QFxListView); return d->model ? d->model->delegate() : 0; } void QFxListView::setDelegate(QmlComponent *delegate) { Q_D(QFxListView); if (!d->ownModel) { d->model = new QFxVisualItemModel(qmlContext(this)); d->ownModel = true; } d->model->setDelegate(delegate); d->updateCurrent(d->currentIndex); refill(); } /*! \qmlproperty int ListView::currentIndex \qmlproperty Item ListView::current \c currentIndex holds the index of the current item. \c current is the current item. Note that the position of the current item may only be approximate until it becomes visible in the view. */ int QFxListView::currentIndex() const { Q_D(const QFxListView); return d->currentIndex; } void QFxListView::setCurrentIndex(int index) { Q_D(QFxListView); d->moveReason = QFxListViewPrivate::Other; if (d->isValid() && index != d->currentIndex && index < d->model->count() && index >= 0) d->updateCurrent(index); else d->currentIndex = index; } QFxItem *QFxListView::currentItem() { Q_D(QFxListView); if (!d->currentItem) { // Always return something valid if (!d->tmpCurrent) { d->tmpCurrent = new QFxItem; d->tmpCurrent->setParent(viewport()); } return d->tmpCurrent; } return d->currentItem->item; } /*! \qmlproperty int ListView::count This property holds the number of items in the view. */ int QFxListView::count() const { Q_D(const QFxListView); 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 will be created for each list. The geometry of the resultant component instance will be managed by the list so as to stay with the current item, unless the autoHighlight property is false. The below example demonstrates how to make a simple highlight for a vertical list. \snippet doc/src/snippets/declarative/listview/listview.qml 1 \image trivialListView.png \sa autoHighlight */ QmlComponent *QFxListView::highlight() const { Q_D(const QFxListView); return d->highlightComponent; } void QFxListView::setHighlight(QmlComponent *highlight) { Q_D(QFxListView); delete d->highlightComponent; d->highlightComponent = highlight; d->updateCurrent(d->currentIndex); } /*! \qmlproperty bool ListView::autoHighlight This property holds whether the highlight is managed by the view. If autoHighlight is true, the highlight will be moved smoothly to follow the current item. If autoHighlight is false, the highlight will not be moved by the view, and must be implemented by the highlight. The following example creates a highlight with its motion defined by the spring \l {Follow}: \snippet doc/src/snippets/declarative/listview/highlight.qml 1 \sa highlight */ bool QFxListView::autoHighlight() const { Q_D(const QFxListView); return d->autoHighlight; } void QFxListView::setAutoHighlight(bool autoHighlight) { Q_D(QFxListView); d->autoHighlight = autoHighlight; if (d->highlightPosAnimator) { d->highlightPosAnimator->setEnabled(d->autoHighlight); d->highlightSizeAnimator->setEnabled(d->autoHighlight); } d->updateHighlight(); } /*! \qmlproperty enumeration ListView::currentItemPositioning This property determines the current item positioning and selection characteristics. The modes supported are: \list \i Free - For Mouse, the current item may be positioned anywhere, whether within the visible area, or outside. During Keyboard interaction, the current item can move within the visible area, and the view will scroll to keep the highlight visible. \i Snap - For mouse, the current item may be positioned anywhere, whether within the visible area, or outside. During keyboard interaction, the current item will be kept in the visible area and will prefer to be positioned at the \l snapPosition, however the view will never scroll beyond the beginning or end of the view. \i SnapAuto - For both mouse and keyboard, the current item will be kept at the \l {snapPosition}. Additionally, if the view is dragged or flicked, the current item will be automatically updated to be the item currently at the snapPosition. \endlist */ QFxListView::CurrentItemPositioning QFxListView::currentItemPositioning() const { Q_D(const QFxListView); return d->currItemMode; } void QFxListView::setCurrentItemPositioning(CurrentItemPositioning mode) { Q_D(QFxListView); d->currItemMode = mode; } /*! \qmlproperty int ListView::snapPosition When currentItemPositioning is set to Snap or SnapAuto, the \c snapPosition determines where the top of the items will snap to. */ int QFxListView::snapPosition() const { Q_D(const QFxListView); return d->snapPos; } void QFxListView::setSnapPosition(int pos) { Q_D(QFxListView); d->snapPos = pos; } /*! \qmlproperty enumeration ListView::orientation This property holds the orientation of the list. Possible values are \c Vertical (default) and \c Horizontal. Vertical Example: \image trivialListView.png Horizontal Example: \image ListViewHorizontal.png */ Qt::Orientation QFxListView::orientation() const { Q_D(const QFxListView); return d->orient; } void QFxListView::setOrientation(Qt::Orientation orientation) { Q_D(QFxListView); if (d->orient != orientation) { d->orient = orientation; if (d->orient == Qt::Vertical) setViewportWidth(-1); else setViewportHeight(-1); d->clear(); refill(); d->updateCurrent(d->currentIndex); } } /*! \qmlproperty bool ListView::wrap This property holds whether the list wraps key navigation If this property is true then key presses to move off of one end of the list will cause the selection to jump to the other side. */ bool QFxListView::isWrapEnabled() const { Q_D(const QFxListView); return d->wrap; } void QFxListView::setWrapEnabled(bool wrap) { Q_D(QFxListView); d->wrap = wrap; } /*! \qmlproperty int ListView::cacheBuffer This property holds the number of off-screen pixels to cache. This property determines the number of pixels above the top of the list and below the bottom of the list to cache. Setting this value can make scrolling the list smoother at the expense of additional memory usage. */ /*! \property QFxListView::cacheBuffer \brief sets the number of off-screen pixels to cache. This property determines the number of pixels above the top of the list and below the bottom of the list to cache. Setting this value can make scrolling the list smoother at the expense of additional memory usage. */ int QFxListView::cacheBuffer() const { Q_D(const QFxListView); return d->buffer; } void QFxListView::setCacheBuffer(int b) { Q_D(QFxListView); if (d->buffer != b) { d->buffer = b; if (isComponentComplete()) refill(); } } /*! \qmlproperty string ListView::sectionExpression This property holds the expression to be evaluated for the section attached property. 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/listview/sections.qml 0 \image ListViewSections.png */ QString QFxListView::sectionExpression() const { Q_D(const QFxListView); return d->sectionExpression; } void QFxListView::setSectionExpression(const QString &expression) { Q_D(QFxListView); if (d->sectionExpression != expression) { d->sectionExpression = expression; emit sectionExpressionChanged(); } } QString QFxListView::currentSection() const { Q_D(const QFxListView); return d->currentSection; } void QFxListView::viewportMoved() { Q_D(QFxListView); QFxFlickable::viewportMoved(); refill(); if (isFlicking() || d->pressed) d->moveReason = QFxListViewPrivate::Mouse; if (d->currItemMode == SnapAuto && d->moveReason == QFxListViewPrivate::Mouse) { // Update current index int idx = d->snapIndex(); if (idx >= 0 && idx != d->currentIndex) d->updateCurrent(idx); } } /*! \reimp */ qreal QFxListView::minYExtent() const { Q_D(const QFxListView); if (d->orient == Qt::Horizontal) return QFxFlickable::minYExtent(); qreal extent = -d->startPosition(); if (d->currItemMode == SnapAuto) extent += d->snapPos; return extent; } /*! \reimp */ qreal QFxListView::maxYExtent() const { Q_D(const QFxListView); if (d->orient == Qt::Horizontal) return QFxFlickable::maxYExtent(); qreal extent; if (d->currItemMode == SnapAuto) extent = -(d->positionAt(count()-1) - d->snapPos); else extent = -(d->endPosition() - height()); if (extent > 0) extent = 0; return extent; } /*! \reimp */ qreal QFxListView::minXExtent() const { Q_D(const QFxListView); if (d->orient == Qt::Vertical) return QFxFlickable::minXExtent(); qreal extent = -d->startPosition(); if (d->currItemMode == SnapAuto) extent += d->snapPos; return extent; } /*! \reimp */ qreal QFxListView::maxXExtent() const { Q_D(const QFxListView); if (d->orient == Qt::Vertical) return QFxFlickable::maxXExtent(); qreal extent; if (d->currItemMode == SnapAuto) extent = -(d->positionAt(count()-1) - d->snapPos); else extent = -(d->endPosition() - width()); if (extent > 0) extent = 0; return extent; } void QFxListView::keyPressEvent(QKeyEvent *event) { Q_D(QFxListView); if (d->model && d->model->count() && !d->locked) { if ((d->orient == Qt::Horizontal && event->key() == Qt::Key_Left) || (d->orient == Qt::Vertical && event->key() == Qt::Key_Up)) { if (currentIndex() > 0 || d->wrap) { d->keyPressed = true; d->moveReason = QFxListViewPrivate::Key; int index = currentIndex()-1; d->updateCurrent(index >= 0 ? index : d->model->count()-1); event->accept(); } return; } else if ((d->orient == Qt::Horizontal && event->key() == Qt::Key_Right) || (d->orient == Qt::Vertical && event->key() == Qt::Key_Down)) { if (currentIndex() < d->model->count() - 1 || d->wrap) { d->keyPressed = true; d->moveReason = QFxListViewPrivate::Key; int index = currentIndex()+1; d->updateCurrent(index < d->model->count() ? index : 0); event->accept(); } return; } } d->moveReason = QFxListViewPrivate::Other; QFxFlickable::keyPressEvent(event); } void QFxListView::keyReleaseEvent(QKeyEvent *event) { Q_D(QFxListView); d->keyPressed = false; QFxFlickable::keyReleaseEvent(event); } void QFxListView::componentComplete() { Q_D(QFxListView); QFxFlickable::componentComplete(); if (d->currentIndex < 0) d->updateCurrent(0); refill(); d->fixupPosition(); } void QFxListView::refill() { Q_D(QFxListView); d->refill(d->position(), d->position()+d->size()-1); } void QFxListView::trackedPositionChanged() { Q_D(QFxListView); if (!d->trackedItem) return; if (!isFlicking() && !d->pressed && d->moveReason != QFxListViewPrivate::Mouse) { switch (d->currItemMode) { case Free: if (d->trackedItem->position() < d->position()) { d->setPosition(d->trackedItem->position()); } else if (d->trackedItem->endPosition() > d->position() + d->size()) { qreal pos = d->trackedItem->endPosition() - d->size(); if (d->trackedItem->size() > d->size()) pos = d->trackedItem->position(); d->setPosition(pos); } d->fixupPosition(); break; case Snap: if (d->trackedItem->position() < d->startPosition() + d->snapPos) d->setPosition(d->startPosition()); else if (d->trackedItem->endPosition() > d->endPosition() - d->size() + d->snapPos + d->trackedItem->size()) d->setPosition(d->endPosition() - d->size()); else d->setPosition(d->trackedItem->position() - d->snapPos); break; case SnapAuto: d->setPosition(d->trackedItem->position() - d->snapPos); break; } } else if (d->fixCurrentVisibility && d->currentItem && !d->pressed) { /* if (d->trackedItem->position() < d->position() && d->currentItem->position() < d->position()) { d->setPosition(d->trackedItem->position()); } else if (d->size() && d->trackedItem->size() <= d->size() && d->trackedItem->endPosition() > d->position() + d->size() && d->currentItem->endPosition() > d->position() + d->size()) { d->setPosition(d->trackedItem->endPosition() - d->size()); } if (d->trackedItem->position() == d->currentItem->position()) d->fixCurrentVisibility = false; */ } } void QFxListView::itemResized() { Q_D(QFxListView); QFxItem *item = qobject_cast(sender()); if (item) { d->activeItem = item; // Ick - don't delete the sender d->layout(); d->activeItem = 0; d->fixupPosition(); } } void QFxListView::itemsInserted(int modelIndex, int count) { Q_D(QFxListView); d->updateUnrequestedIndexes(); if (!d->visibleItems.count() || d->model->count() <= 1) { d->layout(); d->updateCurrent(qMax(0, qMin(d->currentIndex, d->model->count()-1))); emit countChanged(); return; } if (!d->mapRangeFromModel(modelIndex, count)) { int i = d->visibleItems.count() - 1; while (i > 0 && d->visibleItems.at(i)->index == -1) --i; if (d->visibleItems.at(i)->index + 1 == modelIndex) { // Special case of appending an item to the model. modelIndex = d->visibleIndex + d->visibleItems.count(); } else { if (modelIndex + count - 1 < 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 += count; } } if (d->currentIndex >= modelIndex) { // adjust current item index d->currentIndex += count; if (d->currentItem) d->currentItem->index = d->currentIndex; } d->layout(); emit countChanged(); return; } } // At least some of the added items will be visible int index = modelIndex - d->visibleIndex; int to = d->buffer+d->position()+d->size()-1; // 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()+1; int initialPos = pos; QList added; for (int i = 0; i < count && pos <= to; ++i) { FxListItem *item = d->createItem(modelIndex + i); d->visibleItems.insert(index, item); item->setPosition(pos); added.append(item); pos += item->size(); ++index; } 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() + (pos - initialPos)); } } if (pos > to) { // 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()); } else { // Update the indexes of the following visible items. for (; index < d->visibleItems.count(); ++index) { FxListItem *listItem = d->visibleItems.at(index); listItem->setPosition(listItem->position() + (pos - initialPos)); 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->updateUnrequestedPositions(); emit countChanged(); } void QFxListView::itemsRemoved(int modelIndex, int count) { Q_D(QFxListView); d->updateUnrequestedIndexes(); if (!d->mapRangeFromModel(modelIndex, count)) { if (modelIndex + count - 1 < d->visibleIndex) { // Items removed before our 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 -= count; } } if (d->currentIndex >= modelIndex + count) { d->currentIndex -= count; if (d->currentItem) d->currentItem->index -= count; } else if (d->currentIndex >= modelIndex && d->currentIndex < modelIndex + count) { // current item has been removed. d->releaseItem(d->currentItem); d->currentItem = 0; d->currentIndex = -1; d->updateCurrent(qMin(modelIndex, d->model->count()-1)); } d->layout(); emit countChanged(); return; } // 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 item->attached->emitRemove(); if (item->attached->delayRemove()) { item->index = -1; connect(item->attached, SIGNAL(delayRemoveChanged()), this, SLOT(destroyRemoved()), Qt::QueuedConnection); ++it; } else { it = d->visibleItems.erase(it); d->releaseItem(item); } } } // fix current if (d->currentIndex >= modelIndex + count) { d->currentIndex -= count; if (d->currentItem) d->currentItem->index -= count; } else if (d->currentIndex >= modelIndex && d->currentIndex < modelIndex + count) { // current item has been removed. d->releaseItem(d->currentItem); d->currentItem = 0; d->currentIndex = -1; d->updateCurrent(qMin(modelIndex, d->model->count()-1)); } // update visibleIndex for (it = d->visibleItems.begin(); it != d->visibleItems.end(); ++it) { if ((*it)->index != -1) { d->visibleIndex = (*it)->index; break; } } if (d->visibleItems.isEmpty()) { d->visibleIndex = 0; d->visiblePos = 0; d->_tl.clear(); d->setPosition(0); if (d->model->count() == 0) update(); else refill(); } else { // Correct the positioning of the items d->layout(); } emit countChanged(); } void QFxListView::destroyRemoved() { Q_D(QFxListView); 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 QFxListView::createdItem(int index, QFxItem *item) { Q_D(QFxListView); if (d->requestedIndex != index) { item->setItemParent(viewport()); d->unrequestedItems.insert(item, index); if (d->orient == Qt::Vertical) item->setY(d->positionAt(index)); else item->setX(d->positionAt(index)); } } void QFxListView::destroyingItem(QFxItem *item) { Q_D(QFxListView); d->unrequestedItems.remove(item); } QObject *QFxListView::qmlAttachedProperties(QObject *obj) { return QFxListViewAttached::properties(obj); } QML_DEFINE_TYPE(QFxListView,ListView) QT_END_NAMESPACE #include "qfxlistview.moc"