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Diffstat (limited to 'src/declarative/graphicsitems/qdeclarativepathview.cpp')
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diff --git a/src/declarative/graphicsitems/qdeclarativepathview.cpp b/src/declarative/graphicsitems/qdeclarativepathview.cpp new file mode 100644 index 00000000..e0bc514b --- /dev/null +++ b/src/declarative/graphicsitems/qdeclarativepathview.cpp @@ -0,0 +1,1729 @@ +/**************************************************************************** +** +** Copyright (C) 2012 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 "private/qdeclarativepathview_p.h" +#include "private/qdeclarativepathview_p_p.h" + +#include <qdeclarativestate_p.h> +#include <qdeclarativeopenmetaobject_p.h> +#include <QDebug> +#include <QEvent> +#include <qlistmodelinterface_p.h> +#include <QGraphicsSceneEvent> + +#include <qmath.h> +#include <math.h> + +QT_BEGIN_NAMESPACE + +inline qreal qmlMod(qreal x, qreal y) +{ +#ifdef QT_USE_MATH_H_FLOATS + if(sizeof(qreal) == sizeof(float)) + return fmodf(float(x), float(y)); + else +#endif + return fmod(x, y); +} + +static QDeclarativeOpenMetaObjectType *qPathViewAttachedType = 0; + +QDeclarativePathViewAttached::QDeclarativePathViewAttached(QObject *parent) +: QObject(parent), m_percent(-1), m_view(0), m_onPath(false), m_isCurrent(false) +{ + if (qPathViewAttachedType) { + m_metaobject = new QDeclarativeOpenMetaObject(this, qPathViewAttachedType); + m_metaobject->setCached(true); + } else { + m_metaobject = new QDeclarativeOpenMetaObject(this); + } +} + +QDeclarativePathViewAttached::~QDeclarativePathViewAttached() +{ +} + +QVariant QDeclarativePathViewAttached::value(const QByteArray &name) const +{ + return m_metaobject->value(name); +} +void QDeclarativePathViewAttached::setValue(const QByteArray &name, const QVariant &val) +{ + m_metaobject->setValue(name, val); +} + + +void QDeclarativePathViewPrivate::init() +{ + Q_Q(QDeclarativePathView); + offset = 0; + q->setAcceptedMouseButtons(Qt::LeftButton); + q->setFlag(QGraphicsItem::ItemIsFocusScope); + q->setFiltersChildEvents(true); + q->connect(&tl, SIGNAL(updated()), q, SLOT(ticked())); + lastPosTime.invalidate(); + static int timelineCompletedIdx = -1; + static int movementEndingIdx = -1; + if (timelineCompletedIdx == -1) { + timelineCompletedIdx = QDeclarativeTimeLine::staticMetaObject.indexOfSignal("completed()"); + movementEndingIdx = QDeclarativePathView::staticMetaObject.indexOfSlot("movementEnding()"); + } + QMetaObject::connect(&tl, timelineCompletedIdx, + q, movementEndingIdx, Qt::DirectConnection); +} + +QDeclarativeItem *QDeclarativePathViewPrivate::getItem(int modelIndex) +{ + Q_Q(QDeclarativePathView); + requestedIndex = modelIndex; + QDeclarativeItem *item = model->item(modelIndex, false); + if (item) { + if (!attType) { + // pre-create one metatype to share with all attached objects + attType = new QDeclarativeOpenMetaObjectType(&QDeclarativePathViewAttached::staticMetaObject, qmlEngine(q)); + foreach(const QString &attr, path->attributes()) + attType->createProperty(attr.toUtf8()); + } + qPathViewAttachedType = attType; + QDeclarativePathViewAttached *att = static_cast<QDeclarativePathViewAttached *>(qmlAttachedPropertiesObject<QDeclarativePathView>(item)); + qPathViewAttachedType = 0; + if (att) { + att->m_view = q; + att->setOnPath(true); + } + item->setParentItem(q); + QDeclarativeItemPrivate *itemPrivate = static_cast<QDeclarativeItemPrivate*>(QGraphicsItemPrivate::get(item)); + itemPrivate->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry); + } + requestedIndex = -1; + return item; +} + +void QDeclarativePathViewPrivate::releaseItem(QDeclarativeItem *item) +{ + if (!item || !model) + return; + QDeclarativeItemPrivate *itemPrivate = static_cast<QDeclarativeItemPrivate*>(QGraphicsItemPrivate::get(item)); + itemPrivate->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry); + if (model->release(item) == 0) { + // item was not destroyed, and we no longer reference it. + if (QDeclarativePathViewAttached *att = attached(item)) + att->setOnPath(false); + } +} + +QDeclarativePathViewAttached *QDeclarativePathViewPrivate::attached(QDeclarativeItem *item) +{ + return static_cast<QDeclarativePathViewAttached *>(qmlAttachedPropertiesObject<QDeclarativePathView>(item, false)); +} + +void QDeclarativePathViewPrivate::clear() +{ + for (int i=0; i<items.count(); i++){ + QDeclarativeItem *p = items[i]; + releaseItem(p); + } + items.clear(); +} + +void QDeclarativePathViewPrivate::updateMappedRange() +{ + if (model && pathItems != -1 && pathItems < modelCount) + mappedRange = qreal(pathItems)/modelCount; + else + mappedRange = 1.0; +} + +qreal QDeclarativePathViewPrivate::positionOfIndex(qreal index) const +{ + qreal pos = -1.0; + + if (model && index >= 0 && index < modelCount) { + qreal start = 0.0; + if (haveHighlightRange && highlightRangeMode != QDeclarativePathView::NoHighlightRange) + start = highlightRangeStart; + qreal globalPos = index + offset; + globalPos = qmlMod(globalPos, qreal(modelCount)) / modelCount; + if (pathItems != -1 && pathItems < modelCount) { + globalPos += start * mappedRange; + globalPos = qmlMod(globalPos, 1.0); + if (globalPos < mappedRange) + pos = globalPos / mappedRange; + } else { + pos = qmlMod(globalPos + start, 1.0); + } + } + + return pos; +} + +void QDeclarativePathViewPrivate::createHighlight() +{ + Q_Q(QDeclarativePathView); + if (!q->isComponentComplete()) + return; + + bool changed = false; + if (highlightItem) { + if (highlightItem->scene()) + highlightItem->scene()->removeItem(highlightItem); + highlightItem->deleteLater(); + highlightItem = 0; + changed = true; + } + + QDeclarativeItem *item = 0; + if (highlightComponent) { + QDeclarativeContext *highlightContext = new QDeclarativeContext(qmlContext(q)); + QObject *nobj = highlightComponent->create(highlightContext); + if (nobj) { + QDeclarative_setParent_noEvent(highlightContext, nobj); + item = qobject_cast<QDeclarativeItem *>(nobj); + if (!item) + delete nobj; + } else { + delete highlightContext; + } + } else { + item = new QDeclarativeItem; + } + if (item) { + QDeclarative_setParent_noEvent(item, q); + item->setParentItem(q); + highlightItem = item; + changed = true; + } + if (changed) + emit q->highlightItemChanged(); +} + +void QDeclarativePathViewPrivate::updateHighlight() +{ + Q_Q(QDeclarativePathView); + if (!q->isComponentComplete() || !isValid()) + return; + if (highlightItem) { + if (haveHighlightRange && highlightRangeMode == QDeclarativePathView::StrictlyEnforceRange) { + updateItem(highlightItem, highlightRangeStart); + } else { + qreal target = currentIndex; + + offsetAdj = qreal(0.0); + tl.reset(moveHighlight); + moveHighlight.setValue(highlightPosition); + + const int duration = highlightMoveDuration; + + if (target - highlightPosition > modelCount/2) { + highlightUp = false; + qreal distance = modelCount - target + highlightPosition; + tl.move(moveHighlight, qreal(0.0), QEasingCurve(QEasingCurve::InQuad), int(duration * highlightPosition / distance)); + tl.set(moveHighlight, modelCount-qreal(0.01)); + tl.move(moveHighlight, target, QEasingCurve(QEasingCurve::OutQuad), int(duration * (modelCount-target) / distance)); + } else if (target - highlightPosition <= -modelCount/2) { + highlightUp = true; + qreal distance = modelCount - highlightPosition + target; + tl.move(moveHighlight, modelCount-qreal(0.01), QEasingCurve(QEasingCurve::InQuad), int(duration * (modelCount-highlightPosition) / distance)); + tl.set(moveHighlight, qreal(0.0)); + tl.move(moveHighlight, target, QEasingCurve(QEasingCurve::OutQuad), int(duration * target / distance)); + } else { + highlightUp = highlightPosition - target < 0; + tl.move(moveHighlight, target, QEasingCurve(QEasingCurve::InOutQuad), duration); + } + } + } +} + +void QDeclarativePathViewPrivate::setHighlightPosition(qreal pos) +{ + if (pos != highlightPosition) { + qreal start = 0.0; + qreal end = 1.0; + if (haveHighlightRange && highlightRangeMode != QDeclarativePathView::NoHighlightRange) { + start = highlightRangeStart; + end = highlightRangeEnd; + } + + qreal range = qreal(modelCount); + // calc normalized position of highlight relative to offset + qreal relativeHighlight = qmlMod(pos + offset, range) / range; + + if (!highlightUp && relativeHighlight > end * mappedRange) { + qreal diff = qreal(1.0) - relativeHighlight; + setOffset(offset + diff * range); + } else if (highlightUp && relativeHighlight >= (end - start) * mappedRange) { + qreal diff = relativeHighlight - (end - start) * mappedRange; + setOffset(offset - diff * range - qreal(0.00001)); + } + + highlightPosition = pos; + qreal pathPos = positionOfIndex(pos); + updateItem(highlightItem, pathPos); + if (QDeclarativePathViewAttached *att = attached(highlightItem)) + att->setOnPath(pathPos != qreal(-1.0)); + } +} + +void QDeclarativePathView::pathUpdated() +{ + Q_D(QDeclarativePathView); + QList<QDeclarativeItem*>::iterator it = d->items.begin(); + while (it != d->items.end()) { + QDeclarativeItem *item = *it; + if (QDeclarativePathViewAttached *att = d->attached(item)) + att->m_percent = -1; + ++it; + } + refill(); +} + +void QDeclarativePathViewPrivate::updateItem(QDeclarativeItem *item, qreal percent) +{ + if (QDeclarativePathViewAttached *att = attached(item)) { + if (qFuzzyCompare(att->m_percent, percent)) + return; + att->m_percent = percent; + foreach(const QString &attr, path->attributes()) + att->setValue(attr.toUtf8(), path->attributeAt(attr, percent)); + } + QPointF pf = path->pointAt(percent); + item->setX(qRound(pf.x() - item->width()/2)); + item->setY(qRound(pf.y() - item->height()/2)); +} + +void QDeclarativePathViewPrivate::regenerate() +{ + Q_Q(QDeclarativePathView); + if (!q->isComponentComplete()) + return; + + clear(); + + if (!isValid()) + return; + + firstIndex = -1; + updateMappedRange(); + q->refill(); +} + +/*! + \qmlclass PathView QDeclarativePathView + \ingroup qml-view-elements + \since 4.7 + \brief The PathView element lays out model-provided items on a path. + \inherits Item + + A PathView 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. + + The view has a \l model, which defines the data to be displayed, and + a \l delegate, which defines how the data should be displayed. + The \l delegate is instantiated for each item on the \l path. + The items may be flicked to move them along the path. + + For example, if there is a simple list model defined in a file \c ContactModel.qml like this: + + \snippet doc/src/snippets/declarative/pathview/ContactModel.qml 0 + + This data can be represented as a PathView, like this: + + \snippet doc/src/snippets/declarative/pathview/pathview.qml 0 + + \image pathview.gif + + (Note the above example uses PathAttribute to scale and modify the + opacity of the items as they rotate. This additional code can be seen in the + PathAttribute documentation.) + + PathView does not automatically handle keyboard navigation. This is because + the keys to use for navigation will depend upon the shape of the path. Navigation + can be added quite simply by setting \c focus to \c true and calling + \l decrementCurrentIndex() or \l incrementCurrentIndex(), for example to navigate + using the left and right arrow keys: + + \qml + PathView { + // ... + focus: true + Keys.onLeftPressed: decrementCurrentIndex() + Keys.onRightPressed: incrementCurrentIndex() + } + \endqml + + The path 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. + + PathView attaches a number of properties to the root item of the delegate, for example + \c {PathView.isCurrentItem}. In the following example, the root delegate item can access + this attached property directly as \c PathView.isCurrentItem, while the child + \c nameText object must refer to this property as \c wrapper.PathView.isCurrentItem. + + \snippet doc/src/snippets/declarative/pathview/pathview.qml 1 + + \bold Note that 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 Path, {declarative/modelviews/pathview}{PathView example} +*/ + +QDeclarativePathView::QDeclarativePathView(QDeclarativeItem *parent) + : QDeclarativeItem(*(new QDeclarativePathViewPrivate), parent) +{ + Q_D(QDeclarativePathView); + d->init(); +} + +QDeclarativePathView::~QDeclarativePathView() +{ + Q_D(QDeclarativePathView); + d->clear(); + if (d->attType) + d->attType->release(); + if (d->ownModel) + delete d->model; +} + +/*! + \qmlattachedproperty PathView PathView::view + This attached property holds the view that manages this delegate instance. + + It is attached to each instance of the delegate. +*/ + +/*! + \qmlattachedproperty bool PathView::onPath + This attached property holds whether the item is currently on the path. + + If a pathItemCount has been set, it is possible that some items may + be instantiated, but not considered to be currently on the path. + Usually, these items would be set invisible, for example: + + \qml + Component { + Rectangle { + visible: PathView.onPath + // ... + } + } + \endqml + + It is attached to each instance of the delegate. +*/ + +/*! + \qmlattachedproperty bool PathView::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. + + \snippet doc/src/snippets/declarative/pathview/pathview.qml 1 +*/ + +/*! + \qmlproperty model PathView::model + This property holds the model providing data for the view. + + 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. + Models can also be created directly in QML, using the ListModel element. + + \sa {qmlmodels}{Data Models} +*/ +QVariant QDeclarativePathView::model() const +{ + Q_D(const QDeclarativePathView); + return d->modelVariant; +} + +void QDeclarativePathView::setModel(const QVariant &model) +{ + Q_D(QDeclarativePathView); + if (d->modelVariant == model) + return; + + if (d->model) { + disconnect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int))); + disconnect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int))); + disconnect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int))); + disconnect(d->model, SIGNAL(modelReset()), this, SLOT(modelReset())); + disconnect(d->model, SIGNAL(createdItem(int,QDeclarativeItem*)), this, SLOT(createdItem(int,QDeclarativeItem*))); + for (int i=0; i<d->items.count(); i++){ + QDeclarativeItem *p = d->items[i]; + d->model->release(p); + } + d->items.clear(); + } + + d->modelVariant = model; + QObject *object = qvariant_cast<QObject*>(model); + QDeclarativeVisualModel *vim = 0; + if (object && (vim = qobject_cast<QDeclarativeVisualModel *>(object))) { + if (d->ownModel) { + delete d->model; + d->ownModel = false; + } + d->model = vim; + } else { + if (!d->ownModel) { + d->model = new QDeclarativeVisualDataModel(qmlContext(this), this); + d->ownModel = true; + } + if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) + dataModel->setModel(model); + } + d->modelCount = 0; + if (d->model) { + connect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int))); + connect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int))); + connect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int))); + connect(d->model, SIGNAL(modelReset()), this, SLOT(modelReset())); + connect(d->model, SIGNAL(createdItem(int,QDeclarativeItem*)), this, SLOT(createdItem(int,QDeclarativeItem*))); + d->modelCount = d->model->count(); + if (d->model->count()) + d->offset = qmlMod(d->offset, qreal(d->model->count())); + if (d->offset < 0) + d->offset = d->model->count() + d->offset; +} + d->regenerate(); + d->fixOffset(); + emit countChanged(); + emit modelChanged(); +} + +/*! + \qmlproperty int PathView::count + This property holds the number of items in the model. +*/ +int QDeclarativePathView::count() const +{ + Q_D(const QDeclarativePathView); + return d->model ? d->modelCount : 0; +} + +/*! + \qmlproperty Path PathView::path + This property holds the path used to lay out the items. + For more information see the \l Path documentation. +*/ +QDeclarativePath *QDeclarativePathView::path() const +{ + Q_D(const QDeclarativePathView); + return d->path; +} + +void QDeclarativePathView::setPath(QDeclarativePath *path) +{ + Q_D(QDeclarativePathView); + if (d->path == path) + return; + if (d->path) + disconnect(d->path, SIGNAL(changed()), this, SLOT(pathUpdated())); + d->path = path; + connect(d->path, SIGNAL(changed()), this, SLOT(pathUpdated())); + if (d->isValid() && isComponentComplete()) { + d->clear(); + if (d->attType) { + d->attType->release(); + d->attType = 0; + } + d->regenerate(); + } + emit pathChanged(); +} + +/*! + \qmlproperty int PathView::currentIndex + This property holds the index of the current item. +*/ +int QDeclarativePathView::currentIndex() const +{ + Q_D(const QDeclarativePathView); + return d->currentIndex; +} + +void QDeclarativePathView::setCurrentIndex(int idx) +{ + Q_D(QDeclarativePathView); + if (d->model && d->modelCount) + idx = qAbs(idx % d->modelCount); + if (d->model && idx != d->currentIndex) { + if (d->modelCount) { + int itemIndex = (d->currentIndex - d->firstIndex + d->modelCount) % d->modelCount; + if (itemIndex < d->items.count()) { + if (QDeclarativeItem *item = d->items.at(itemIndex)) { + if (QDeclarativePathViewAttached *att = d->attached(item)) + att->setIsCurrentItem(false); + } + } + } + d->currentItem = 0; + d->moveReason = QDeclarativePathViewPrivate::SetIndex; + d->currentIndex = idx; + if (d->modelCount) { + if (d->haveHighlightRange && d->highlightRangeMode == QDeclarativePathView::StrictlyEnforceRange) + d->snapToCurrent(); + int itemIndex = (idx - d->firstIndex + d->modelCount) % d->modelCount; + if (itemIndex < d->items.count()) { + d->currentItem = d->items.at(itemIndex); + d->currentItem->setFocus(true); + if (QDeclarativePathViewAttached *att = d->attached(d->currentItem)) + att->setIsCurrentItem(true); + } + d->currentItemOffset = d->positionOfIndex(d->currentIndex); + d->updateHighlight(); + } + emit currentIndexChanged(); + } +} + +/*! + \qmlmethod PathView::incrementCurrentIndex() + + Increments the current index. + + \bold Note: methods should only be called after the Component has completed. +*/ +void QDeclarativePathView::incrementCurrentIndex() +{ + Q_D(QDeclarativePathView); + d->moveDirection = QDeclarativePathViewPrivate::Positive; + setCurrentIndex(currentIndex()+1); +} + + +/*! + \qmlmethod PathView::decrementCurrentIndex() + + Decrements the current index. + + \bold Note: methods should only be called after the Component has completed. +*/ +void QDeclarativePathView::decrementCurrentIndex() +{ + Q_D(QDeclarativePathView); + if (d->model && d->modelCount) { + int idx = currentIndex()-1; + if (idx < 0) + idx = d->modelCount - 1; + d->moveDirection = QDeclarativePathViewPrivate::Negative; + setCurrentIndex(idx); + } +} + +/*! + \qmlproperty real PathView::offset + + The offset specifies how far along the path the items are from their initial positions. + This is a real number that ranges from 0.0 to the count of items in the model. +*/ +qreal QDeclarativePathView::offset() const +{ + Q_D(const QDeclarativePathView); + return d->offset; +} + +void QDeclarativePathView::setOffset(qreal offset) +{ + Q_D(QDeclarativePathView); + d->setOffset(offset); + d->updateCurrent(); +} + +void QDeclarativePathViewPrivate::setOffset(qreal o) +{ + Q_Q(QDeclarativePathView); + if (offset != o) { + if (isValid() && q->isComponentComplete()) { + offset = qmlMod(o, qreal(modelCount)); + if (offset < 0) + offset += qreal(modelCount); + q->refill(); + } else { + offset = o; + } + emit q->offsetChanged(); + } +} + +void QDeclarativePathViewPrivate::setAdjustedOffset(qreal o) +{ + setOffset(o+offsetAdj); +} + +/*! + \qmlproperty Component PathView::highlight + This property holds the component to use as the highlight. + + An instance of the highlight component will be created for each view. + The geometry of the resultant component instance will be managed by the view + so as to stay with the current item. + + The below example demonstrates how to make a simple highlight. Note the use + of the \l{PathView::onPath}{PathView.onPath} attached property to ensure that + the highlight is hidden when flicked away from the path. + + \qml + Component { + Rectangle { + visible: PathView.onPath + // ... + } + } + \endqml + + \sa highlightItem, highlightRangeMode +*/ + +QDeclarativeComponent *QDeclarativePathView::highlight() const +{ + Q_D(const QDeclarativePathView); + return d->highlightComponent; +} + +void QDeclarativePathView::setHighlight(QDeclarativeComponent *highlight) +{ + Q_D(QDeclarativePathView); + if (highlight != d->highlightComponent) { + d->highlightComponent = highlight; + d->createHighlight(); + d->updateHighlight(); + emit highlightChanged(); + } +} + +/*! + \qmlproperty Item PathView::highlightItem + + \c highlightItem holds the highlight item, which was created + from the \l highlight component. + + \sa highlight +*/ +QDeclarativeItem *QDeclarativePathView::highlightItem() +{ + Q_D(const QDeclarativePathView); + return d->highlightItem; +} +/*! + \qmlproperty real PathView::preferredHighlightBegin + \qmlproperty real PathView::preferredHighlightEnd + \qmlproperty enumeration PathView::highlightRangeMode + + These properties set the preferred range of the highlight (current item) + within the view. The preferred values must be in the range 0.0-1.0. + + If highlightRangeMode is set to \e PathView.NoHighlightRange + + If highlightRangeMode is set to \e PathView.ApplyRange the view will + attempt to maintain the highlight within the range, however + the highlight can move outside of the range at the ends of the path + or due to a mouse interaction. + + If highlightRangeMode is set to \e PathView.StrictlyEnforceRange the highlight will never + move outside of the range. This means that the current item will change + if a keyboard or mouse action would cause the highlight to move + outside of the range. + + Note that this is the correct way to influence where the + current item ends up when the view moves. For example, if you want the + currently selected item to be in the middle of the path, then set the + highlight range to be 0.5,0.5 and highlightRangeMode to PathView.StrictlyEnforceRange. + Then, when the path scrolls, + the currently selected item will be the item at that position. This also applies to + when the currently selected item changes - it will scroll to within the preferred + highlight range. Furthermore, the behaviour of the current item index will occur + whether or not a highlight exists. + + The default value is \e PathView.StrictlyEnforceRange. + + Note that a valid range requires preferredHighlightEnd to be greater + than or equal to preferredHighlightBegin. +*/ +qreal QDeclarativePathView::preferredHighlightBegin() const +{ + Q_D(const QDeclarativePathView); + return d->highlightRangeStart; +} + +void QDeclarativePathView::setPreferredHighlightBegin(qreal start) +{ + Q_D(QDeclarativePathView); + if (d->highlightRangeStart == start || start < 0 || start > 1.0) + return; + d->highlightRangeStart = start; + d->haveHighlightRange = d->highlightRangeMode != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd; + refill(); + emit preferredHighlightBeginChanged(); +} + +qreal QDeclarativePathView::preferredHighlightEnd() const +{ + Q_D(const QDeclarativePathView); + return d->highlightRangeEnd; +} + +void QDeclarativePathView::setPreferredHighlightEnd(qreal end) +{ + Q_D(QDeclarativePathView); + if (d->highlightRangeEnd == end || end < 0 || end > 1.0) + return; + d->highlightRangeEnd = end; + d->haveHighlightRange = d->highlightRangeMode != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd; + refill(); + emit preferredHighlightEndChanged(); +} + +QDeclarativePathView::HighlightRangeMode QDeclarativePathView::highlightRangeMode() const +{ + Q_D(const QDeclarativePathView); + return d->highlightRangeMode; +} + +void QDeclarativePathView::setHighlightRangeMode(HighlightRangeMode mode) +{ + Q_D(QDeclarativePathView); + if (d->highlightRangeMode == mode) + return; + d->highlightRangeMode = mode; + d->haveHighlightRange = d->highlightRangeMode != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd; + emit highlightRangeModeChanged(); +} + + +/*! + \qmlproperty int PathView::highlightMoveDuration + This property holds the move animation duration of the highlight delegate. + + If the highlightRangeMode is StrictlyEnforceRange then this property + determines the speed that the items move along the path. + + The default value for the duration is 300ms. +*/ +int QDeclarativePathView::highlightMoveDuration() const +{ + Q_D(const QDeclarativePathView); + return d->highlightMoveDuration; +} + +void QDeclarativePathView::setHighlightMoveDuration(int duration) +{ + Q_D(QDeclarativePathView); + if (d->highlightMoveDuration == duration) + return; + d->highlightMoveDuration = duration; + emit highlightMoveDurationChanged(); +} + +/*! + \qmlproperty real PathView::dragMargin + This property holds the maximum distance from the path that initiate mouse dragging. + + By default the path can only be dragged by clicking on an item. If + dragMargin is greater than zero, a drag can be initiated by clicking + within dragMargin pixels of the path. +*/ +qreal QDeclarativePathView::dragMargin() const +{ + Q_D(const QDeclarativePathView); + return d->dragMargin; +} + +void QDeclarativePathView::setDragMargin(qreal dragMargin) +{ + Q_D(QDeclarativePathView); + if (d->dragMargin == dragMargin) + return; + d->dragMargin = dragMargin; + emit dragMarginChanged(); +} + +/*! + \qmlproperty real PathView::flickDeceleration + This property holds the rate at which a flick will decelerate. + + The default is 100. +*/ +qreal QDeclarativePathView::flickDeceleration() const +{ + Q_D(const QDeclarativePathView); + return d->deceleration; +} + +void QDeclarativePathView::setFlickDeceleration(qreal dec) +{ + Q_D(QDeclarativePathView); + if (d->deceleration == dec) + return; + d->deceleration = dec; + emit flickDecelerationChanged(); +} + +/*! + \qmlproperty bool PathView::interactive + + A user cannot drag or flick a PathView that is not interactive. + + This property is useful for temporarily disabling flicking. This allows + special interaction with PathView's children. +*/ +bool QDeclarativePathView::isInteractive() const +{ + Q_D(const QDeclarativePathView); + return d->interactive; +} + +void QDeclarativePathView::setInteractive(bool interactive) +{ + Q_D(QDeclarativePathView); + if (interactive != d->interactive) { + d->interactive = interactive; + if (!interactive) + d->tl.clear(); + emit interactiveChanged(); + } +} + +/*! + \qmlproperty bool PathView::moving + + This property holds whether the view is currently moving + due to the user either dragging or flicking the view. +*/ +bool QDeclarativePathView::isMoving() const +{ + Q_D(const QDeclarativePathView); + return d->moving; +} + +/*! + \qmlproperty bool PathView::flicking + + This property holds whether the view is currently moving + due to the user flicking the view. +*/ +bool QDeclarativePathView::isFlicking() const +{ + Q_D(const QDeclarativePathView); + return d->flicking; +} + +/*! + \qmlsignal PathView::onMovementStarted() + + This handler is called when the view begins moving due to user + interaction. +*/ + +/*! + \qmlsignal PathView::onMovementEnded() + + This handler is called when the view stops moving due to user + interaction. If a flick was generated, this handler will + be triggered once the flick stops. If a flick was not + generated, the handler will be triggered when the + user stops dragging - i.e. a mouse or touch release. +*/ + +/*! + \qmlsignal PathView::onFlickStarted() + + This handler is called when the view is flicked. A flick + starts from the point that the mouse or touch is released, + while still in motion. +*/ + +/*! + \qmlsignal PathView::onFlickEnded() + + This handler is called when the view stops moving due to a flick. +*/ + +/*! + \qmlproperty Component PathView::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 when pathItemCount is specified. 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. + + Note that the PathView will layout the items based on the size of the root + item in the delegate. + + Here is an example delegate: + \snippet doc/src/snippets/declarative/pathview/pathview.qml 1 +*/ +QDeclarativeComponent *QDeclarativePathView::delegate() const +{ + Q_D(const QDeclarativePathView); + if (d->model) { + if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) + return dataModel->delegate(); + } + + return 0; +} + +void QDeclarativePathView::setDelegate(QDeclarativeComponent *delegate) +{ + Q_D(QDeclarativePathView); + if (delegate == this->delegate()) + return; + if (!d->ownModel) { + d->model = new QDeclarativeVisualDataModel(qmlContext(this)); + d->ownModel = true; + } + if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) { + int oldCount = dataModel->count(); + dataModel->setDelegate(delegate); + d->modelCount = dataModel->count(); + d->regenerate(); + if (oldCount != dataModel->count()) + emit countChanged(); + emit delegateChanged(); + } +} + +/*! + \qmlproperty int PathView::pathItemCount + This property holds the number of items visible on the path at any one time. +*/ +int QDeclarativePathView::pathItemCount() const +{ + Q_D(const QDeclarativePathView); + return d->pathItems; +} + +void QDeclarativePathView::setPathItemCount(int i) +{ + Q_D(QDeclarativePathView); + if (i == d->pathItems) + return; + if (i < 1) + i = 1; + d->pathItems = i; + d->updateMappedRange(); + if (d->isValid() && isComponentComplete()) { + d->regenerate(); + } + emit pathItemCountChanged(); +} + +QPointF QDeclarativePathViewPrivate::pointNear(const QPointF &point, qreal *nearPercent) const +{ + //XXX maybe do recursively at increasing resolution. + qreal mindist = 1e10; // big number + QPointF nearPoint = path->pointAt(0); + qreal nearPc = 0; + for (qreal i=1; i < 1000; i++) { + QPointF pt = path->pointAt(i/1000.0); + QPointF diff = pt - point; + qreal dist = diff.x()*diff.x() + diff.y()*diff.y(); + if (dist < mindist) { + nearPoint = pt; + nearPc = i; + mindist = dist; + } + } + + if (nearPercent) + *nearPercent = nearPc / 1000.0; + + return nearPoint; +} + +void QDeclarativePathView::mousePressEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QDeclarativePathView); + if (d->interactive) { + d->handleMousePressEvent(event); + event->accept(); + } else { + QDeclarativeItem::mousePressEvent(event); + } +} + +void QDeclarativePathViewPrivate::handleMousePressEvent(QGraphicsSceneMouseEvent *event) +{ + Q_Q(QDeclarativePathView); + if (!interactive || !items.count()) + return; + QPointF scenePoint = q->mapToScene(event->pos()); + int idx = 0; + for (; idx < items.count(); ++idx) { + QRectF rect = items.at(idx)->boundingRect(); + rect = items.at(idx)->mapToScene(rect).boundingRect(); + if (rect.contains(scenePoint)) + break; + } + if (idx == items.count() && dragMargin == 0.) // didn't click on an item + return; + + startPoint = pointNear(event->pos(), &startPc); + if (idx == items.count()) { + qreal distance = qAbs(event->pos().x() - startPoint.x()) + qAbs(event->pos().y() - startPoint.y()); + if (distance > dragMargin) + return; + } + + if (tl.isActive() && flicking) + stealMouse = true; // If we've been flicked then steal the click. + else + stealMouse = false; + + lastElapsed = 0; + lastDist = 0; + QDeclarativeItemPrivate::start(lastPosTime); + tl.clear(); +} + +void QDeclarativePathView::mouseMoveEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QDeclarativePathView); + if (d->interactive) { + d->handleMouseMoveEvent(event); + if (d->stealMouse) + setKeepMouseGrab(true); + event->accept(); + } else { + QDeclarativeItem::mouseMoveEvent(event); + } +} + +void QDeclarativePathViewPrivate::handleMouseMoveEvent(QGraphicsSceneMouseEvent *event) +{ + Q_Q(QDeclarativePathView); + if (!interactive || !lastPosTime.isValid()) + return; + + qreal newPc; + QPointF pathPoint = pointNear(event->pos(), &newPc); + if (!stealMouse) { + QPointF delta = pathPoint - startPoint; + if (qAbs(delta.x()) > QApplication::startDragDistance() || qAbs(delta.y()) > QApplication::startDragDistance()) { + stealMouse = true; + startPc = newPc; + } + } + + if (stealMouse) { + moveReason = QDeclarativePathViewPrivate::Mouse; + qreal diff = (newPc - startPc)*modelCount*mappedRange; + if (diff) { + q->setOffset(offset + diff); + + if (diff > modelCount/2) + diff -= modelCount; + else if (diff < -modelCount/2) + diff += modelCount; + + lastElapsed = QDeclarativeItemPrivate::restart(lastPosTime); + lastDist = diff; + startPc = newPc; + } + if (!moving) { + moving = true; + emit q->movingChanged(); + emit q->movementStarted(); + } + } +} + +void QDeclarativePathView::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QDeclarativePathView); + if (d->interactive) { + d->handleMouseReleaseEvent(event); + event->accept(); + ungrabMouse(); + } else { + QDeclarativeItem::mouseReleaseEvent(event); + } +} + +void QDeclarativePathViewPrivate::handleMouseReleaseEvent(QGraphicsSceneMouseEvent *) +{ + Q_Q(QDeclarativePathView); + stealMouse = false; + q->setKeepMouseGrab(false); + if (!interactive || !lastPosTime.isValid()) + return; + + qreal elapsed = qreal(lastElapsed + QDeclarativeItemPrivate::elapsed(lastPosTime)) / 1000.; + qreal velocity = elapsed > 0. ? lastDist / elapsed : 0; + if (model && modelCount && qAbs(velocity) > qreal(1.)) { + qreal count = pathItems == -1 ? modelCount : pathItems; + if (qAbs(velocity) > count * 2) // limit velocity + velocity = (velocity > 0 ? count : -count) * 2; + // Calculate the distance to be travelled + qreal v2 = velocity*velocity; + qreal accel = deceleration/10; + // + 0.25 to encourage moving at least one item in the flick direction + qreal dist = qMin(qreal(modelCount-1), qreal(v2 / (accel * qreal(2.0)) + qreal(0.25))); + if (haveHighlightRange && highlightRangeMode == QDeclarativePathView::StrictlyEnforceRange) { + // round to nearest item. + if (velocity > 0.) + dist = qRound(dist + offset) - offset; + else + dist = qRound(dist - offset) + offset; + // Calculate accel required to stop on item boundary + if (dist <= 0.) { + dist = qreal(0.); + accel = qreal(0.); + } else { + accel = v2 / (2.0f * qAbs(dist)); + } + } + offsetAdj = qreal(0.0); + moveOffset.setValue(offset); + tl.accel(moveOffset, velocity, accel, dist); + tl.callback(QDeclarativeTimeLineCallback(&moveOffset, fixOffsetCallback, this)); + if (!flicking) { + flicking = true; + emit q->flickingChanged(); + emit q->flickStarted(); + } + } else { + fixOffset(); + } + + lastPosTime.invalidate(); + if (!tl.isActive()) + q->movementEnding(); +} + +bool QDeclarativePathView::sendMouseEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QDeclarativePathView); + QGraphicsSceneMouseEvent mouseEvent(event->type()); + QRectF myRect = mapToScene(QRectF(0, 0, width(), height())).boundingRect(); + QGraphicsScene *s = scene(); + QDeclarativeItem *grabber = s ? qobject_cast<QDeclarativeItem*>(s->mouseGrabberItem()) : 0; + bool stealThisEvent = d->stealMouse; + if ((stealThisEvent || myRect.contains(event->scenePos().toPoint())) && (!grabber || !grabber->keepMouseGrab())) { + mouseEvent.setAccepted(false); + for (int i = 0x1; i <= 0x10; i <<= 1) { + if (event->buttons() & i) { + Qt::MouseButton button = Qt::MouseButton(i); + mouseEvent.setButtonDownPos(button, mapFromScene(event->buttonDownPos(button))); + } + } + mouseEvent.setScenePos(event->scenePos()); + mouseEvent.setLastScenePos(event->lastScenePos()); + mouseEvent.setPos(mapFromScene(event->scenePos())); + mouseEvent.setLastPos(mapFromScene(event->lastScenePos())); + + switch(mouseEvent.type()) { + case QEvent::GraphicsSceneMouseMove: + d->handleMouseMoveEvent(&mouseEvent); + break; + case QEvent::GraphicsSceneMousePress: + d->handleMousePressEvent(&mouseEvent); + stealThisEvent = d->stealMouse; // Update stealThisEvent in case changed by function call above + break; + case QEvent::GraphicsSceneMouseRelease: + d->handleMouseReleaseEvent(&mouseEvent); + break; + default: + break; + } + grabber = qobject_cast<QDeclarativeItem*>(s->mouseGrabberItem()); + if (grabber && stealThisEvent && !grabber->keepMouseGrab() && grabber != this) + grabMouse(); + + return d->stealMouse; + } else if (d->lastPosTime.isValid()) { + d->lastPosTime.invalidate(); + } + if (mouseEvent.type() == QEvent::GraphicsSceneMouseRelease) + d->stealMouse = false; + return false; +} + +bool QDeclarativePathView::sceneEventFilter(QGraphicsItem *i, QEvent *e) +{ + Q_D(QDeclarativePathView); + if (!isVisible() || !d->interactive) + return QDeclarativeItem::sceneEventFilter(i, e); + + switch (e->type()) { + case QEvent::GraphicsSceneMousePress: + case QEvent::GraphicsSceneMouseMove: + case QEvent::GraphicsSceneMouseRelease: + return sendMouseEvent(static_cast<QGraphicsSceneMouseEvent *>(e)); + default: + break; + } + + return QDeclarativeItem::sceneEventFilter(i, e); +} + +bool QDeclarativePathView::event(QEvent *event) +{ + if (event->type() == QEvent::User) { + refill(); + return true; + } + + return QDeclarativeItem::event(event); +} + +void QDeclarativePathView::componentComplete() +{ + Q_D(QDeclarativePathView); + QDeclarativeItem::componentComplete(); + d->createHighlight(); + // It is possible that a refill has already happended to to Path + // bindings being handled in the componentComplete(). If so + // don't do it again. + if (d->items.count() == 0 && d->model) { + d->modelCount = d->model->count(); + d->regenerate(); + } + d->updateHighlight(); +} + +void QDeclarativePathView::refill() +{ + Q_D(QDeclarativePathView); + if (!d->isValid() || !isComponentComplete()) + return; + + d->layoutScheduled = false; + bool currentVisible = false; + + // first move existing items and remove items off path + int idx = d->firstIndex; + QList<QDeclarativeItem*>::iterator it = d->items.begin(); + while (it != d->items.end()) { + qreal pos = d->positionOfIndex(idx); + QDeclarativeItem *item = *it; + if (pos >= 0.0) { + d->updateItem(item, pos); + if (idx == d->currentIndex) { + currentVisible = true; + d->currentItemOffset = pos; + } + ++it; + } else { +// qDebug() << "release"; + d->updateItem(item, 1.0); + d->releaseItem(item); + if (it == d->items.begin()) { + if (++d->firstIndex >= d->modelCount) + d->firstIndex = 0; + } + it = d->items.erase(it); + } + ++idx; + if (idx >= d->modelCount) + idx = 0; + } + if (!d->items.count()) + d->firstIndex = -1; + + if (d->modelCount) { + // add items to beginning and end + int count = d->pathItems == -1 ? d->modelCount : qMin(d->pathItems, d->modelCount); + if (d->items.count() < count) { + int idx = qRound(d->modelCount - d->offset) % d->modelCount; + qreal startPos = 0.0; + if (d->haveHighlightRange && d->highlightRangeMode != QDeclarativePathView::NoHighlightRange) + startPos = d->highlightRangeStart; + if (d->firstIndex >= 0) { + startPos = d->positionOfIndex(d->firstIndex); + idx = (d->firstIndex + d->items.count()) % d->modelCount; + } + qreal pos = d->positionOfIndex(idx); + while ((pos > startPos || !d->items.count()) && d->items.count() < count) { + // qDebug() << "append" << idx; + QDeclarativeItem *item = d->getItem(idx); + if (d->model->completePending()) + item->setZValue(idx+1); + if (d->currentIndex == idx) { + item->setFocus(true); + if (QDeclarativePathViewAttached *att = d->attached(item)) + att->setIsCurrentItem(true); + currentVisible = true; + d->currentItemOffset = pos; + d->currentItem = item; + } + if (d->items.count() == 0) + d->firstIndex = idx; + d->items.append(item); + d->updateItem(item, pos); + if (d->model->completePending()) + d->model->completeItem(); + ++idx; + if (idx >= d->modelCount) + idx = 0; + pos = d->positionOfIndex(idx); + } + + idx = d->firstIndex - 1; + if (idx < 0) + idx = d->modelCount - 1; + pos = d->positionOfIndex(idx); + while (pos >= 0.0 && pos < startPos) { + // qDebug() << "prepend" << idx; + QDeclarativeItem *item = d->getItem(idx); + if (d->model->completePending()) + item->setZValue(idx+1); + if (d->currentIndex == idx) { + item->setFocus(true); + if (QDeclarativePathViewAttached *att = d->attached(item)) + att->setIsCurrentItem(true); + currentVisible = true; + d->currentItemOffset = pos; + d->currentItem = item; + } + d->items.prepend(item); + d->updateItem(item, pos); + if (d->model->completePending()) + d->model->completeItem(); + d->firstIndex = idx; + idx = d->firstIndex - 1; + if (idx < 0) + idx = d->modelCount - 1; + pos = d->positionOfIndex(idx); + } + } + } + + if (!currentVisible) + d->currentItemOffset = 1.0; + + if (d->highlightItem && d->haveHighlightRange && d->highlightRangeMode == QDeclarativePathView::StrictlyEnforceRange) { + d->updateItem(d->highlightItem, d->highlightRangeStart); + if (QDeclarativePathViewAttached *att = d->attached(d->highlightItem)) + att->setOnPath(true); + } else if (d->highlightItem && d->moveReason != QDeclarativePathViewPrivate::SetIndex) { + d->updateItem(d->highlightItem, d->currentItemOffset); + if (QDeclarativePathViewAttached *att = d->attached(d->highlightItem)) + att->setOnPath(currentVisible); + } + while (d->itemCache.count()) + d->releaseItem(d->itemCache.takeLast()); +} + +void QDeclarativePathView::itemsInserted(int modelIndex, int count) +{ + //XXX support animated insertion + Q_D(QDeclarativePathView); + if (!d->isValid() || !isComponentComplete()) + return; + + if (d->modelCount) { + d->itemCache += d->items; + d->items.clear(); + if (modelIndex <= d->currentIndex) { + d->currentIndex += count; + emit currentIndexChanged(); + } else if (d->offset != 0) { + d->offset += count; + d->offsetAdj += count; + } + } + d->modelCount += count; + if (d->flicking || d->moving) { + d->regenerate(); + d->updateCurrent(); + } else { + d->firstIndex = -1; + d->updateMappedRange(); + d->scheduleLayout(); + } + emit countChanged(); +} + +void QDeclarativePathView::itemsRemoved(int modelIndex, int count) +{ + //XXX support animated removal + Q_D(QDeclarativePathView); + if (!d->model || !d->modelCount || !d->model->isValid() || !d->path || !isComponentComplete()) + return; + + // fix current + bool currentChanged = false; + if (d->currentIndex >= modelIndex + count) { + d->currentIndex -= count; + currentChanged = true; + } else if (d->currentIndex >= modelIndex && d->currentIndex < modelIndex + count) { + // current item has been removed. + d->currentIndex = qMin(modelIndex, d->modelCount-count-1); + if (d->currentItem) { + if (QDeclarativePathViewAttached *att = d->attached(d->currentItem)) + att->setIsCurrentItem(true); + } + currentChanged = true; + } + + d->itemCache += d->items; + d->items.clear(); + + bool changedOffset = false; + if (modelIndex > d->currentIndex) { + if (d->offset >= count) { + changedOffset = true; + d->offset -= count; + d->offsetAdj -= count; + } + } + + d->modelCount -= count; + if (!d->modelCount) { + while (d->itemCache.count()) + d->releaseItem(d->itemCache.takeLast()); + d->offset = 0; + changedOffset = true; + d->tl.reset(d->moveOffset); + update(); + } else { + d->regenerate(); + d->updateCurrent(); + if (!d->flicking && !d->moving && d->haveHighlightRange && d->highlightRangeMode == QDeclarativePathView::StrictlyEnforceRange) + d->snapToCurrent(); + } + if (changedOffset) + emit offsetChanged(); + if (currentChanged) + emit currentIndexChanged(); + emit countChanged(); +} + +void QDeclarativePathView::itemsMoved(int /*from*/, int /*to*/, int /*count*/) +{ + Q_D(QDeclarativePathView); + if (!d->isValid() || !isComponentComplete()) + return; + + QList<QDeclarativeItem *> removedItems = d->items; + d->items.clear(); + d->regenerate(); + while (removedItems.count()) + d->releaseItem(removedItems.takeLast()); + + // Fix current index + if (d->currentIndex >= 0 && d->currentItem) { + int oldCurrent = d->currentIndex; + d->currentIndex = d->model->indexOf(d->currentItem, this); + if (oldCurrent != d->currentIndex) + emit currentIndexChanged(); + } + d->updateCurrent(); +} + +void QDeclarativePathView::modelReset() +{ + Q_D(QDeclarativePathView); + d->modelCount = d->model->count(); + d->regenerate(); + emit countChanged(); +} + +void QDeclarativePathView::createdItem(int index, QDeclarativeItem *item) +{ + Q_D(QDeclarativePathView); + if (d->requestedIndex != index) { + if (!d->attType) { + // pre-create one metatype to share with all attached objects + d->attType = new QDeclarativeOpenMetaObjectType(&QDeclarativePathViewAttached::staticMetaObject, qmlEngine(this)); + foreach(const QString &attr, d->path->attributes()) + d->attType->createProperty(attr.toUtf8()); + } + qPathViewAttachedType = d->attType; + QDeclarativePathViewAttached *att = static_cast<QDeclarativePathViewAttached *>(qmlAttachedPropertiesObject<QDeclarativePathView>(item)); + qPathViewAttachedType = 0; + if (att) { + att->m_view = this; + att->setOnPath(false); + } + item->setParentItem(this); + d->updateItem(item, index < d->firstIndex ? qreal(0.0) : qreal(1.0)); + } +} + +void QDeclarativePathView::destroyingItem(QDeclarativeItem *item) +{ + Q_UNUSED(item); +} + +void QDeclarativePathView::ticked() +{ + Q_D(QDeclarativePathView); + d->updateCurrent(); +} + +void QDeclarativePathView::movementEnding() +{ + Q_D(QDeclarativePathView); + if (d->flicking) { + d->flicking = false; + emit flickingChanged(); + emit flickEnded(); + } + if (d->moving && !d->stealMouse) { + d->moving = false; + emit movingChanged(); + emit movementEnded(); + } +} + +// find the item closest to the snap position +int QDeclarativePathViewPrivate::calcCurrentIndex() +{ + int current = -1; + if (modelCount && model && items.count()) { + offset = qmlMod(offset, modelCount); + if (offset < 0) + offset += modelCount; + current = qRound(qAbs(qmlMod(modelCount - offset, modelCount))); + current = current % modelCount; + } + + return current; +} + +void QDeclarativePathViewPrivate::updateCurrent() +{ + Q_Q(QDeclarativePathView); + if (moveReason != Mouse) + return; + if (!modelCount || !haveHighlightRange || highlightRangeMode != QDeclarativePathView::StrictlyEnforceRange) + return; + + int idx = calcCurrentIndex(); + if (model && idx != currentIndex) { + int itemIndex = (currentIndex - firstIndex + modelCount) % modelCount; + if (itemIndex < items.count()) { + if (QDeclarativeItem *item = items.at(itemIndex)) { + if (QDeclarativePathViewAttached *att = attached(item)) + att->setIsCurrentItem(false); + } + } + currentIndex = idx; + currentItem = 0; + itemIndex = (idx - firstIndex + modelCount) % modelCount; + if (itemIndex < items.count()) { + currentItem = items.at(itemIndex); + currentItem->setFocus(true); + if (QDeclarativePathViewAttached *att = attached(currentItem)) + att->setIsCurrentItem(true); + } + emit q->currentIndexChanged(); + } +} + +void QDeclarativePathViewPrivate::fixOffsetCallback(void *d) +{ + ((QDeclarativePathViewPrivate *)d)->fixOffset(); +} + +void QDeclarativePathViewPrivate::fixOffset() +{ + Q_Q(QDeclarativePathView); + if (model && items.count()) { + if (haveHighlightRange && highlightRangeMode == QDeclarativePathView::StrictlyEnforceRange) { + int curr = calcCurrentIndex(); + if (curr != currentIndex) + q->setCurrentIndex(curr); + else + snapToCurrent(); + } + } +} + +void QDeclarativePathViewPrivate::snapToCurrent() +{ + if (!model || modelCount <= 0) + return; + + qreal targetOffset = qmlMod(modelCount - currentIndex, modelCount); + + moveReason = Other; + offsetAdj = 0.0; + tl.reset(moveOffset); + moveOffset.setValue(offset); + + const int duration = highlightMoveDuration; + + if (moveDirection == Positive || (moveDirection == Shortest && targetOffset - offset > modelCount/2)) { + qreal distance = modelCount - targetOffset + offset; + if (targetOffset > moveOffset) { + tl.move(moveOffset, 0.0, QEasingCurve(QEasingCurve::InQuad), int(duration * offset / distance)); + tl.set(moveOffset, modelCount); + tl.move(moveOffset, targetOffset, QEasingCurve(offset == 0.0 ? QEasingCurve::InOutQuad : QEasingCurve::OutQuad), int(duration * (modelCount-targetOffset) / distance)); + } else { + tl.move(moveOffset, targetOffset, QEasingCurve(QEasingCurve::InOutQuad), duration); + } + } else if (moveDirection == Negative || targetOffset - offset <= -modelCount/2) { + qreal distance = modelCount - offset + targetOffset; + if (targetOffset < moveOffset) { + tl.move(moveOffset, modelCount, QEasingCurve(targetOffset == 0 ? QEasingCurve::InOutQuad : QEasingCurve::InQuad), int(duration * (modelCount-offset) / distance)); + tl.set(moveOffset, 0.0); + tl.move(moveOffset, targetOffset, QEasingCurve(QEasingCurve::OutQuad), int(duration * targetOffset / distance)); + } else { + tl.move(moveOffset, targetOffset, QEasingCurve(QEasingCurve::InOutQuad), duration); + } + } else { + tl.move(moveOffset, targetOffset, QEasingCurve(QEasingCurve::InOutQuad), duration); + } + moveDirection = Shortest; +} + +QDeclarativePathViewAttached *QDeclarativePathView::qmlAttachedProperties(QObject *obj) +{ + return new QDeclarativePathViewAttached(obj); +} + +QT_END_NAMESPACE + |