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Diffstat (limited to 'src/declarative/graphicsitems/qmlgraphicspathview.cpp')
| -rw-r--r-- | src/declarative/graphicsitems/qmlgraphicspathview.cpp | 976 |
1 files changed, 976 insertions, 0 deletions
diff --git a/src/declarative/graphicsitems/qmlgraphicspathview.cpp b/src/declarative/graphicsitems/qmlgraphicspathview.cpp new file mode 100644 index 0000000..6718d25 --- /dev/null +++ b/src/declarative/graphicsitems/qmlgraphicspathview.cpp @@ -0,0 +1,976 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qmlgraphicspathview_p.h" +#include "qmlgraphicspathview_p_p.h" + +#include <qmlstate_p.h> +#include <qmlopenmetaobject_p.h> + +#include <QDebug> +#include <QEvent> +#include <qlistmodelinterface_p.h> +#include <QGraphicsSceneEvent> + +#include <math.h> + +QT_BEGIN_NAMESPACE + +QML_DEFINE_TYPE(Qt,4,6,PathView,QmlGraphicsPathView) + + +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); +} + + +class QmlGraphicsPathViewAttached : public QObject +{ + Q_OBJECT + + Q_PROPERTY(bool onPath READ isOnPath NOTIFY onPathChanged) +public: + QmlGraphicsPathViewAttached(QObject *parent) + : QObject(parent), mo(new QmlOpenMetaObject(this)), onPath(false) + { + } + + ~QmlGraphicsPathViewAttached() + { + QmlGraphicsPathView::attachedProperties.remove(parent()); + } + + QVariant value(const QByteArray &name) const + { + return mo->value(name); + } + void setValue(const QByteArray &name, const QVariant &val) + { + mo->setValue(name, val); + } + + bool isOnPath() const { return onPath; } + void setOnPath(bool on) { + if (on != onPath) { + onPath = on; + emit onPathChanged(); + } + } + +Q_SIGNALS: + void onPathChanged(); + +private: + QmlOpenMetaObject *mo; + bool onPath; +}; + + +QmlGraphicsItem *QmlGraphicsPathViewPrivate::getItem(int modelIndex) +{ + Q_Q(QmlGraphicsPathView); + requestedIndex = modelIndex; + QmlGraphicsItem *item = model->item(modelIndex); + if (item) { + if (QObject *obj = QmlGraphicsPathView::qmlAttachedProperties(item)) + static_cast<QmlGraphicsPathViewAttached *>(obj)->setOnPath(true); + item->setParentItem(q); + } + requestedIndex = -1; + return item; +} + +void QmlGraphicsPathViewPrivate::releaseItem(QmlGraphicsItem *item) +{ + if (!item || !model) + return; + if (QObject *obj = QmlGraphicsPathView::qmlAttachedProperties(item)) + static_cast<QmlGraphicsPathViewAttached *>(obj)->setOnPath(false); + if (model->release(item) == 0) { + if (QObject *obj = QmlGraphicsPathView::qmlAttachedProperties(item)) + static_cast<QmlGraphicsPathViewAttached *>(obj)->setOnPath(false); + } +} + +/*! + \qmlclass PathView QmlGraphicsPathView + \brief The PathView element lays out model-provided items on a path. + \inherits Item + + The model is typically provided by a QAbstractListModel "C++ model object", but can also be created directly in QML. + + The items are laid out along a path defined by a \l Path and may be flicked to scroll. + + \snippet doc/src/snippets/declarative/pathview/pathview.qml 0 + + \image pathview.gif + + \sa Path +*/ + +QmlGraphicsPathView::QmlGraphicsPathView(QmlGraphicsItem *parent) + : QmlGraphicsItem(*(new QmlGraphicsPathViewPrivate), parent) +{ + Q_D(QmlGraphicsPathView); + d->init(); +} + +QmlGraphicsPathView::~QmlGraphicsPathView() +{ + Q_D(QmlGraphicsPathView); + if (d->ownModel) + delete d->model; +} + +/*! + \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: + + \code + Component { + Rectangle { + visible: PathView.onPath + ... + } + } + \endcode + + It is attached to each instance of the delegate. +*/ + +/*! + \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 XML, using the ListModel element. + + \sa {qmlmodels}{Data Models} +*/ +QVariant QmlGraphicsPathView::model() const +{ + Q_D(const QmlGraphicsPathView); + return d->modelVariant; +} + +void QmlGraphicsPathView::setModel(const QVariant &model) +{ + Q_D(QmlGraphicsPathView); + 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, QmlGraphicsItem*)), this, SLOT(createdItem(int,QmlGraphicsItem*))); + for (int i=0; i<d->items.count(); i++){ + QmlGraphicsItem *p = d->items[i]; + d->model->release(p); + } + d->items.clear(); + } + + d->modelVariant = model; + QObject *object = qvariant_cast<QObject*>(model); + QmlGraphicsVisualModel *vim = 0; + if (object && (vim = qobject_cast<QmlGraphicsVisualModel *>(object))) { + if (d->ownModel) { + delete d->model; + d->ownModel = false; + } + d->model = vim; + } else { + if (!d->ownModel) { + d->model = new QmlGraphicsVisualDataModel(qmlContext(this)); + d->ownModel = true; + } + if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) + dataModel->setModel(model); + } + 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(createdItem(int, QmlGraphicsItem*)), this, SLOT(createdItem(int,QmlGraphicsItem*))); + } + d->firstIndex = 0; + d->pathOffset = 0; + d->regenerate(); + d->fixOffset(); +} + +/*! + \qmlproperty int PathView::count + This property holds the number of items in the model. +*/ +int QmlGraphicsPathView::count() const +{ + Q_D(const QmlGraphicsPathView); + return d->model ? d->model->count() : 0; +} + +/*! + \qmlproperty Path PathView::path + \default + This property holds the path used to lay out the items. + For more information see the \l Path documentation. +*/ +QmlGraphicsPath *QmlGraphicsPathView::path() const +{ + Q_D(const QmlGraphicsPathView); + return d->path; +} + +void QmlGraphicsPathView::setPath(QmlGraphicsPath *path) +{ + Q_D(QmlGraphicsPathView); + d->path = path; + connect(d->path, SIGNAL(changed()), this, SLOT(refill())); + d->regenerate(); +} + +/*! + \qmlproperty int PathView::currentIndex + This property holds the index of the current item. +*/ +int QmlGraphicsPathView::currentIndex() const +{ + Q_D(const QmlGraphicsPathView); + return d->currentIndex; +} + +void QmlGraphicsPathView::setCurrentIndex(int idx) +{ + Q_D(QmlGraphicsPathView); + if (d->model && d->model->count()) + idx = qAbs(idx % d->model->count()); + if (d->model && idx != d->currentIndex) { + d->currentIndex = idx; + if (d->model->count()) { + d->snapToCurrent(); + int itemIndex = (idx - d->firstIndex + d->model->count()) % d->model->count(); + if (itemIndex < d->items.count()) + d->items.at(itemIndex)->setFocus(true); + } + emit currentIndexChanged(); + } +} + +/*! + \qmlproperty real PathView::offset + + The offset specifies how far along the path the items are from their initial positions. +*/ +qreal QmlGraphicsPathView::offset() const +{ + Q_D(const QmlGraphicsPathView); + return d->_offset; +} + +void QmlGraphicsPathView::setOffset(qreal offset) +{ + Q_D(QmlGraphicsPathView); + d->setOffset(offset); + d->updateCurrent(); +} + +void QmlGraphicsPathViewPrivate::setOffset(qreal o) +{ + Q_Q(QmlGraphicsPathView); + if (_offset != o) { + _offset = qmlMod(o, qreal(100.0)); + if (_offset < 0) + _offset = 100.0 + _offset; + q->refill(); + } +} + +/*! + \qmlproperty real PathView::snapPosition + + This property determines the position (0-100) the nearest item will snap to. +*/ +qreal QmlGraphicsPathView::snapPosition() const +{ + Q_D(const QmlGraphicsPathView); + return d->snapPos; +} + +void QmlGraphicsPathView::setSnapPosition(qreal pos) +{ + Q_D(QmlGraphicsPathView); + d->snapPos = pos/100; + d->fixOffset(); +} + +/*! + \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 QmlGraphicsPathView::dragMargin() const +{ + Q_D(const QmlGraphicsPathView); + return d->dragMargin; +} + +void QmlGraphicsPathView::setDragMargin(qreal dragMargin) +{ + Q_D(QmlGraphicsPathView); + d->dragMargin = dragMargin; +} + +/*! + \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}. + + 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 +*/ +QmlComponent *QmlGraphicsPathView::delegate() const +{ + Q_D(const QmlGraphicsPathView); + if (d->model) { + if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) + return dataModel->delegate(); + } + + return 0; +} + +void QmlGraphicsPathView::setDelegate(QmlComponent *c) +{ + Q_D(QmlGraphicsPathView); + if (!d->ownModel) { + d->model = new QmlGraphicsVisualDataModel(qmlContext(this)); + d->ownModel = true; + } + if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) { + dataModel->setDelegate(c); + d->regenerate(); + } +} + +/*! + \qmlproperty int PathView::pathItemCount + This property holds the number of items visible on the path at any one time +*/ +int QmlGraphicsPathView::pathItemCount() const +{ + Q_D(const QmlGraphicsPathView); + return d->pathItems; +} + +void QmlGraphicsPathView::setPathItemCount(int i) +{ + Q_D(QmlGraphicsPathView); + if (i == d->pathItems) + return; + d->pathItems = i; + d->regenerate(); +} + +QPointF QmlGraphicsPathViewPrivate::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 / 10.0; + + return nearPoint; +} + + +void QmlGraphicsPathView::mousePressEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QmlGraphicsPathView); + if (!d->items.count()) + return; + QPointF scenePoint = mapToScene(event->pos()); + int idx = 0; + for (; idx < d->items.count(); ++idx) { + QRectF rect = d->items.at(idx)->boundingRect(); + rect = d->items.at(idx)->mapToScene(rect).boundingRect(); + if (rect.contains(scenePoint)) + break; + } + if (idx == d->items.count() && d->dragMargin == 0.) // didn't click on an item + return; + + d->startPoint = d->pointNear(event->pos(), &d->startPc); + if (idx == d->items.count()) { + qreal distance = qAbs(event->pos().x() - d->startPoint.x()) + qAbs(event->pos().y() - d->startPoint.y()); + if (distance > d->dragMargin) + return; + } + + d->stealMouse = false; + d->lastElapsed = 0; + d->lastDist = 0; + QmlGraphicsItemPrivate::start(d->lastPosTime); + d->tl.clear(); +} + +void QmlGraphicsPathView::mouseMoveEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QmlGraphicsPathView); + if (d->lastPosTime.isNull()) + return; + + if (!d->stealMouse) { + QPointF delta = event->pos() - d->startPoint; + if (qAbs(delta.x()) > QApplication::startDragDistance() && qAbs(delta.y()) > QApplication::startDragDistance()) + d->stealMouse = true; + } + + if (d->stealMouse) { + d->moveReason = QmlGraphicsPathViewPrivate::Mouse; + qreal newPc; + d->pointNear(event->pos(), &newPc); + qreal diff = newPc - d->startPc; + if (diff) { + setOffset(d->_offset + diff); + + if (diff > 50) + diff -= 100; + else if (diff < -50) + diff += 100; + + d->lastElapsed = QmlGraphicsItemPrivate::restart(d->lastPosTime); + d->lastDist = diff; + d->startPc = newPc; + } + } +} + +void QmlGraphicsPathView::mouseReleaseEvent(QGraphicsSceneMouseEvent *) +{ + Q_D(QmlGraphicsPathView); + if (d->lastPosTime.isNull()) + return; + + qreal elapsed = qreal(d->lastElapsed + QmlGraphicsItemPrivate::elapsed(d->lastPosTime)) / 1000.; + qreal velocity = elapsed > 0. ? d->lastDist / elapsed : 0; + if (d->model && d->model->count() && qAbs(velocity) > 5) { + if (velocity > 100) + velocity = 100; + else if (velocity < -100) + velocity = -100; + qreal inc = qmlMod(d->_offset - d->snapPos, qreal(100.0 / d->model->count())); + qreal dist = qAbs(velocity/2 - qmlMod(velocity/2, qreal(100.0 / d->model->count()) - inc)); + d->moveOffset.setValue(d->_offset); + d->tl.accel(d->moveOffset, velocity, 10, dist); + d->tl.execute(d->fixupOffsetEvent); + } else { + d->fixOffset(); + } + + d->lastPosTime = QTime(); + d->stealMouse = false; + ungrabMouse(); +} + +bool QmlGraphicsPathView::sendMouseEvent(QGraphicsSceneMouseEvent *event) +{ + Q_D(QmlGraphicsPathView); + QGraphicsSceneMouseEvent mouseEvent(event->type()); + QRectF myRect = mapToScene(QRectF(0, 0, width(), height())).boundingRect(); + QGraphicsScene *s = scene(); + QmlGraphicsItem *grabber = s ? qobject_cast<QmlGraphicsItem*>(s->mouseGrabberItem()) : 0; + if ((d->stealMouse || 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: + mouseMoveEvent(&mouseEvent); + break; + case QEvent::GraphicsSceneMousePress: + mousePressEvent(&mouseEvent); + break; + case QEvent::GraphicsSceneMouseRelease: + mouseReleaseEvent(&mouseEvent); + break; + default: + break; + } + grabber = qobject_cast<QmlGraphicsItem*>(s->mouseGrabberItem()); + if (grabber && d->stealMouse && !grabber->keepMouseGrab() && grabber != this) + grabMouse(); + + return d->stealMouse; + } else if (!d->lastPosTime.isNull()) { + d->lastPosTime = QTime(); + } + return false; +} + +bool QmlGraphicsPathView::sceneEventFilter(QGraphicsItem *i, QEvent *e) +{ + if (!isVisible()) + return QmlGraphicsItem::sceneEventFilter(i, e); + + switch (e->type()) { + case QEvent::GraphicsSceneMousePress: + case QEvent::GraphicsSceneMouseMove: + case QEvent::GraphicsSceneMouseRelease: + { + bool ret = sendMouseEvent(static_cast<QGraphicsSceneMouseEvent *>(e)); + if (e->type() == QEvent::GraphicsSceneMouseRelease) + return ret; + break; + } + default: + break; + } + + return QmlGraphicsItem::sceneEventFilter(i, e); +} + +void QmlGraphicsPathView::componentComplete() +{ + Q_D(QmlGraphicsPathView); + QmlGraphicsItem::componentComplete(); + d->regenerate(); + + // move to correct offset + if (d->items.count()) { + int itemIndex = (d->currentIndex - d->firstIndex + d->model->count()) % d->model->count(); + + itemIndex += d->pathOffset; + itemIndex %= d->items.count(); + qreal targetOffset = qmlMod(100 + (d->snapPos*100) - 100.0 * itemIndex / d->items.count(), qreal(100.0)); + + if (targetOffset < 0) + targetOffset = 100.0 + targetOffset; + if (targetOffset != d->_offset) { + d->moveOffset.setValue(targetOffset); + } + } +} + +void QmlGraphicsPathViewPrivate::regenerate() +{ + Q_Q(QmlGraphicsPathView); + if (!q->isComponentComplete()) + return; + + for (int i=0; i<items.count(); i++){ + QmlGraphicsItem *p = items[i]; + releaseItem(p); + } + items.clear(); + + if (!isValid()) + return; + + if (firstIndex >= model->count()) + firstIndex = model->count()-1; + if (pathOffset >= model->count()) + pathOffset = model->count()-1; + + int numItems = pathItems >= 0 ? pathItems : model->count(); + for (int i=0; i < numItems && i < model->count(); ++i){ + int index = (i + firstIndex) % model->count(); + QmlGraphicsItem *item = getItem(index); + if (!item) { + qWarning() << "PathView: Cannot create item, index" << (i + firstIndex) % model->count(); + return; + } + items.append(item); + item->setZValue(i); + if (currentIndex == index) + item->setFocus(true); + } + q->refill(); +} + +void QmlGraphicsPathViewPrivate::updateItem(QmlGraphicsItem *item, qreal percent) +{ + if (QObject *obj = QmlGraphicsPathView::qmlAttachedProperties(item)) { + foreach(const QString &attr, path->attributes()) + static_cast<QmlGraphicsPathViewAttached *>(obj)->setValue(attr.toUtf8(), path->attributeAt(attr, percent)); + } + QPointF pf = path->pointAt(percent); + item->setX(pf.x() - item->width()*item->scale()/2); + item->setY(pf.y() - item->height()*item->scale()/2); +} + +void QmlGraphicsPathView::refill() +{ + Q_D(QmlGraphicsPathView); + if (!d->isValid() || !isComponentComplete()) + return; + + QList<qreal> positions; + for (int i=0; i<d->items.count(); i++){ + qreal percent = i * (100. / d->items.count()); + percent = percent + d->_offset; + percent = qmlMod(percent, qreal(100.0)); + positions << qAbs(percent/100.0); + } + + if (d->pathItems==-1) { + for (int i=0; i<positions.count(); i++) + d->updateItem(d->items.at(i), positions[i]); + return; + } + + QList<qreal> rotatedPositions; + for (int i=0; i<d->items.count(); i++) + rotatedPositions << positions[(i + d->pathOffset + d->items.count()) % d->items.count()]; + + int wrapIndex= -1; + for (int i=0; i<d->items.count()-1; i++) { + if (rotatedPositions[i] > rotatedPositions[i+1]){ + wrapIndex = i; + break; + } + } + if (wrapIndex != -1 ){ + //A wraparound has occured + if (wrapIndex < d->items.count()/2){ + while(wrapIndex-- >= 0){ + QmlGraphicsItem* p = d->items.takeFirst(); + d->updateItem(p, 0.0); + d->releaseItem(p); + d->firstIndex++; + d->firstIndex %= d->model->count(); + int index = (d->firstIndex + d->items.count())%d->model->count(); + QmlGraphicsItem *item = d->getItem(index); + item->setZValue(wrapIndex); + if (d->currentIndex == index) + item->setFocus(true); + d->items << item; + d->pathOffset++; + d->pathOffset=d->pathOffset % d->items.count(); + } + } else { + while(wrapIndex++ < d->items.count()-1){ + QmlGraphicsItem* p = d->items.takeLast(); + d->updateItem(p, 1.0); + d->releaseItem(p); + d->firstIndex--; + if (d->firstIndex < 0) + d->firstIndex = d->model->count() - 1; + QmlGraphicsItem *item = d->getItem(d->firstIndex); + item->setZValue(d->firstIndex); + if (d->currentIndex == d->firstIndex) + item->setFocus(true); + d->items.prepend(item); + d->pathOffset--; + if (d->pathOffset < 0) + d->pathOffset = d->items.count() - 1; + } + } + for (int i=0; i<d->items.count(); i++) + rotatedPositions[i] = positions[(i + d->pathOffset + d->items.count()) + % d->items.count()]; + } + for (int i=0; i<d->items.count(); i++) + d->updateItem(d->items.at(i), rotatedPositions[i]); +} + +void QmlGraphicsPathView::itemsInserted(int modelIndex, int count) +{ + //XXX support animated insertion + Q_D(QmlGraphicsPathView); + if (!d->isValid() || !isComponentComplete()) + return; + if (d->pathItems == -1) { + for (int i = 0; i < count; ++i) { + QmlGraphicsItem *item = d->getItem(modelIndex + i); + item->setZValue(modelIndex + i); + d->items.insert(modelIndex + i, item); + } + refill(); + } else { + //XXX This is pretty heavy handed until we reference count items. + d->regenerate(); + } + + // make sure the current item is still at the snap position + int itemIndex = (d->currentIndex - d->firstIndex + d->model->count())%d->model->count(); + itemIndex += d->pathOffset; + itemIndex %= d->items.count(); + qreal targetOffset = qmlMod(100 + (d->snapPos*100) - 100.0 * itemIndex / d->items.count(), qreal(100.0)); + + if (targetOffset < 0) + targetOffset = 100.0 + targetOffset; + if (targetOffset != d->_offset) + d->moveOffset.setValue(targetOffset); +} + +void QmlGraphicsPathView::itemsRemoved(int modelIndex, int count) +{ + //XXX support animated removal + Q_D(QmlGraphicsPathView); + if (!d->isValid() || !isComponentComplete()) + return; + if (d->pathItems == -1) { + for (int i = 0; i < count; ++i) { + QmlGraphicsItem* p = d->items.takeAt(modelIndex); + d->model->release(p); + } + d->snapToCurrent(); + refill(); + } else { + d->regenerate(); + } + + if (d->model->count() == 0) { + d->currentIndex = -1; + d->moveOffset.setValue(0); + return; + } + + // make sure the current item is still at the snap position + if (d->currentIndex >= d->model->count()) + d->currentIndex = d->model->count() - 1; + int itemIndex = (d->currentIndex - d->firstIndex + d->model->count())%d->model->count(); + itemIndex += d->pathOffset; + itemIndex %= d->items.count(); + qreal targetOffset = qmlMod(100 + (d->snapPos*100) - 100.0 * itemIndex / d->items.count(), qreal(100.0)); + + if (targetOffset < 0) + targetOffset = 100.0 + targetOffset; + if (targetOffset != d->_offset) + d->moveOffset.setValue(targetOffset); +} + +void QmlGraphicsPathView::createdItem(int index, QmlGraphicsItem *item) +{ + Q_D(QmlGraphicsPathView); + if (d->requestedIndex != index) { + item->setParentItem(this); + d->updateItem(item, index < d->firstIndex ? 0.0 : 1.0); + } +} + +void QmlGraphicsPathView::destroyingItem(QmlGraphicsItem *item) +{ + Q_UNUSED(item); +} + +void QmlGraphicsPathView::ticked() +{ + Q_D(QmlGraphicsPathView); + d->updateCurrent(); +} + +// find the item closest to the snap position +int QmlGraphicsPathViewPrivate::calcCurrentIndex() +{ + int current = -1; + if (model && items.count()) { + _offset = qmlMod(_offset, qreal(100.0)); + if (_offset < 0) + _offset += 100.0; + + if (pathItems == -1) { + qreal delta = qmlMod(_offset - snapPos, qreal(100.0)); + if (delta < 0) + delta = 100.0 + delta; + int ii = model->count() - qRound(delta * model->count() / 100); + if (ii < 0) + ii = 0; + current = ii; + } else { + qreal bestDiff=1e9; + int bestI=-1; + for (int i=0; i<items.count(); i++){ + qreal percent = i * (100. / items.count()); + percent = percent + _offset; + percent = qmlMod(percent, qreal(100.0)); + qreal diff = qAbs(snapPos - (percent/100.0)); + if (diff < bestDiff){ + bestDiff = diff; + bestI = i; + } + } + int modelIndex = (bestI - pathOffset + items.count())%items.count(); + modelIndex += firstIndex; + current = modelIndex; + } + current = qAbs(current % model->count()); + } + + return current; +} + +void QmlGraphicsPathViewPrivate::updateCurrent() +{ + Q_Q(QmlGraphicsPathView); + if (moveReason != Mouse) + return; + int idx = calcCurrentIndex(); + if (model && idx != currentIndex) { + currentIndex = idx; + int itemIndex = (idx - firstIndex + model->count()) % model->count(); + if (itemIndex < items.count()) + items.at(itemIndex)->setFocus(true); + emit q->currentIndexChanged(); + } +} + +void QmlGraphicsPathViewPrivate::fixOffset() +{ + Q_Q(QmlGraphicsPathView); + if (model && items.count()) { + int curr = calcCurrentIndex(); + if (curr != currentIndex) + q->setCurrentIndex(curr); + else + snapToCurrent(); + } +} + +void QmlGraphicsPathViewPrivate::snapToCurrent() +{ + if (!model || model->count() <= 0) + return; + + int itemIndex = (currentIndex - firstIndex + model->count()) % model->count(); + + //Rounds is the number of times round to make the current item visible + int rounds = itemIndex / items.count(); + int otherWayRounds = (model->count() - (itemIndex)) / items.count(); + if (otherWayRounds < rounds) + rounds = -otherWayRounds; + + itemIndex += pathOffset; + if(model->count() % items.count() && itemIndex - model->count() + items.count() > 0){ + //When model.count() is not a multiple of pathItemCount we need to manually + //fix the index so that going backwards one step works correctly. + itemIndex = itemIndex - model->count() + items.count(); + } + itemIndex %= items.count(); + qreal targetOffset = qmlMod(100 + (snapPos*100) - 100.0 * itemIndex / items.count(), qreal(100.0)); + + if (targetOffset < 0) + targetOffset = 100.0 + targetOffset; + if (targetOffset == _offset && rounds == 0) + return; + + moveReason = Other; + tl.clear(); + moveOffset.setValue(_offset); + + if (rounds!=0){ + //Compensate if the targetOffset would bring the target in from off the screen + qreal distance = targetOffset - _offset; + if (distance <= -50) + rounds--; + if (distance > 50) + rounds++; + tl.move(moveOffset, targetOffset + 100.0*(-rounds), QEasingCurve(QEasingCurve::InOutQuad), + int(100*items.count()*qMax((qreal)(2.0/items.count()),(qreal)qAbs(rounds)))); + tl.execute(fixupOffsetEvent); + return; + } + + if (targetOffset - _offset > 50.0) { + qreal distance = 100 - targetOffset + _offset; + tl.move(moveOffset, 0.0, QEasingCurve(QEasingCurve::OutQuad), int(200 * _offset / distance)); + tl.set(moveOffset, 100.0); + tl.move(moveOffset, targetOffset, QEasingCurve(QEasingCurve::InQuad), int(200 * (100-targetOffset) / distance)); + } else if (targetOffset - _offset <= -50.0) { + qreal distance = 100 - _offset + targetOffset; + tl.move(moveOffset, 100.0, QEasingCurve(QEasingCurve::OutQuad), int(200 * (100-_offset) / distance)); + tl.set(moveOffset, 0.0); + tl.move(moveOffset, targetOffset, QEasingCurve(QEasingCurve::InQuad), int(200 * targetOffset / distance)); + } else { + tl.move(moveOffset, targetOffset, QEasingCurve(QEasingCurve::InOutQuad), 200); + } +} + +QHash<QObject*, QObject*> QmlGraphicsPathView::attachedProperties; +QObject *QmlGraphicsPathView::qmlAttachedProperties(QObject *obj) +{ + QObject *rv = attachedProperties.value(obj); + if (!rv) { + rv = new QmlGraphicsPathViewAttached(obj); + attachedProperties.insert(obj, rv); + } + return rv; +} + +QT_END_NAMESPACE + +#include <qmlgraphicspathview.moc> |