/**************************************************************************** ** ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtDeclarative module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "private/qdeclarativeflickable_p.h" #include "private/qdeclarativeflickable_p_p.h" #include #include #include #include QT_BEGIN_NAMESPACE // FlickThreshold determines how far the "mouse" must have moved // before we perform a flick. static const int FlickThreshold = 20; QDeclarativeFlickableVisibleArea::QDeclarativeFlickableVisibleArea(QDeclarativeFlickable *parent) : QObject(parent), flickable(parent), m_xPosition(0.), m_widthRatio(0.) , m_yPosition(0.), m_heightRatio(0.) { } qreal QDeclarativeFlickableVisibleArea::widthRatio() const { return m_widthRatio; } qreal QDeclarativeFlickableVisibleArea::xPosition() const { return m_xPosition; } qreal QDeclarativeFlickableVisibleArea::heightRatio() const { return m_heightRatio; } qreal QDeclarativeFlickableVisibleArea::yPosition() const { return m_yPosition; } void QDeclarativeFlickableVisibleArea::updateVisible() { QDeclarativeFlickablePrivate *p = static_cast(QGraphicsItemPrivate::get(flickable)); bool changeX = false; bool changeY = false; bool changeWidth = false; bool changeHeight = false; // Vertical const qreal viewheight = flickable->height(); const qreal maxyextent = -flickable->maxYExtent() + flickable->minYExtent(); qreal pagePos = (-p->vData.move.value() + flickable->minYExtent()) / (maxyextent + viewheight); qreal pageSize = viewheight / (maxyextent + viewheight); if (pageSize != m_heightRatio) { m_heightRatio = pageSize; changeHeight = true; } if (pagePos != m_yPosition) { m_yPosition = pagePos; changeY = true; } // Horizontal const qreal viewwidth = flickable->width(); const qreal maxxextent = -flickable->maxXExtent() + flickable->minXExtent(); pagePos = (-p->hData.move.value() + flickable->minXExtent()) / (maxxextent + viewwidth); pageSize = viewwidth / (maxxextent + viewwidth); if (pageSize != m_widthRatio) { m_widthRatio = pageSize; changeWidth = true; } if (pagePos != m_xPosition) { m_xPosition = pagePos; changeX = true; } if (changeX) emit xPositionChanged(m_xPosition); if (changeY) emit yPositionChanged(m_yPosition); if (changeWidth) emit widthRatioChanged(m_widthRatio); if (changeHeight) emit heightRatioChanged(m_heightRatio); } QDeclarativeFlickablePrivate::QDeclarativeFlickablePrivate() : contentItem(new QDeclarativeItem) , hData(this, &QDeclarativeFlickablePrivate::setRoundedViewportX) , vData(this, &QDeclarativeFlickablePrivate::setRoundedViewportY) , flickingHorizontally(false), flickingVertically(false) , hMoved(false), vMoved(false) , movingHorizontally(false), movingVertically(false) , stealMouse(false), pressed(false), interactive(true), calcVelocity(false) , deceleration(500), maxVelocity(2000), reportedVelocitySmoothing(100) , delayedPressEvent(0), delayedPressTarget(0), pressDelay(0), fixupDuration(600) , vTime(0), visibleArea(0) , flickableDirection(QDeclarativeFlickable::AutoFlickDirection) , boundsBehavior(QDeclarativeFlickable::DragAndOvershootBounds) { } void QDeclarativeFlickablePrivate::init() { Q_Q(QDeclarativeFlickable); QDeclarative_setParent_noEvent(contentItem, q); contentItem->setParentItem(q); static int timelineUpdatedIdx = -1; static int timelineCompletedIdx = -1; static int flickableTickedIdx = -1; static int flickableMovementEndingIdx = -1; if (timelineUpdatedIdx == -1) { timelineUpdatedIdx = QDeclarativeTimeLine::staticMetaObject.indexOfSignal("updated()"); timelineCompletedIdx = QDeclarativeTimeLine::staticMetaObject.indexOfSignal("completed()"); flickableTickedIdx = QDeclarativeFlickable::staticMetaObject.indexOfSlot("ticked()"); flickableMovementEndingIdx = QDeclarativeFlickable::staticMetaObject.indexOfSlot("movementEnding()"); } QMetaObject::connect(&timeline, timelineUpdatedIdx, q, flickableTickedIdx, Qt::DirectConnection); QMetaObject::connect(&timeline, timelineCompletedIdx, q, flickableMovementEndingIdx, Qt::DirectConnection); q->setAcceptedMouseButtons(Qt::LeftButton); q->setFiltersChildEvents(true); QDeclarativeItemPrivate *viewportPrivate = static_cast(QGraphicsItemPrivate::get(contentItem)); viewportPrivate->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry); lastPosTime.invalidate(); } /* Returns the amount to overshoot by given a velocity. Will be roughly in range 0 - size/4 */ qreal QDeclarativeFlickablePrivate::overShootDistance(qreal velocity, qreal size) { if (maxVelocity <= 0) return 0.0; velocity = qAbs(velocity); if (velocity > maxVelocity) velocity = maxVelocity; qreal dist = size / 4 * velocity / maxVelocity; return dist; } void QDeclarativeFlickablePrivate::itemGeometryChanged(QDeclarativeItem *item, const QRectF &newGeom, const QRectF &oldGeom) { Q_Q(QDeclarativeFlickable); if (item == contentItem) { if (newGeom.x() != oldGeom.x()) emit q->contentXChanged(); if (newGeom.y() != oldGeom.y()) emit q->contentYChanged(); } } void QDeclarativeFlickablePrivate::flickX(qreal velocity) { Q_Q(QDeclarativeFlickable); flick(hData, q->minXExtent(), q->maxXExtent(), q->width(), fixupX_callback, velocity); } void QDeclarativeFlickablePrivate::flickY(qreal velocity) { Q_Q(QDeclarativeFlickable); flick(vData, q->minYExtent(), q->maxYExtent(), q->height(), fixupY_callback, velocity); } void QDeclarativeFlickablePrivate::flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize, QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity) { Q_Q(QDeclarativeFlickable); qreal maxDistance = -1; bool overShoot = boundsBehavior == QDeclarativeFlickable::DragAndOvershootBounds; // -ve velocity means list is moving up if (velocity > 0) { if (data.move.value() < minExtent) maxDistance = qAbs(minExtent - data.move.value() + (overShoot?overShootDistance(velocity,vSize):0)); data.flickTarget = minExtent; } else { if (data.move.value() > maxExtent) maxDistance = qAbs(maxExtent - data.move.value()) + (overShoot?overShootDistance(velocity,vSize):0); data.flickTarget = maxExtent; } if (maxDistance > 0) { qreal v = velocity; if (maxVelocity != -1 && maxVelocity < qAbs(v)) { if (v < 0) v = -maxVelocity; else v = maxVelocity; } timeline.reset(data.move); timeline.accel(data.move, v, deceleration, maxDistance); timeline.callback(QDeclarativeTimeLineCallback(&data.move, fixupCallback, this)); if (!flickingHorizontally && q->xflick()) { flickingHorizontally = true; emit q->flickingChanged(); emit q->flickingHorizontallyChanged(); if (!flickingVertically) emit q->flickStarted(); } if (!flickingVertically && q->yflick()) { flickingVertically = true; emit q->flickingChanged(); emit q->flickingVerticallyChanged(); if (!flickingHorizontally) emit q->flickStarted(); } } else { timeline.reset(data.move); fixup(data, minExtent, maxExtent); } } void QDeclarativeFlickablePrivate::fixupY_callback(void *data) { ((QDeclarativeFlickablePrivate *)data)->fixupY(); } void QDeclarativeFlickablePrivate::fixupX_callback(void *data) { ((QDeclarativeFlickablePrivate *)data)->fixupX(); } void QDeclarativeFlickablePrivate::fixupX() { Q_Q(QDeclarativeFlickable); fixup(hData, q->minXExtent(), q->maxXExtent()); } void QDeclarativeFlickablePrivate::fixupY() { Q_Q(QDeclarativeFlickable); fixup(vData, q->minYExtent(), q->maxYExtent()); } void QDeclarativeFlickablePrivate::fixup(AxisData &data, qreal minExtent, qreal maxExtent) { if (data.move.value() > minExtent || maxExtent > minExtent) { timeline.reset(data.move); if (data.move.value() != minExtent) { if (fixupDuration) { qreal dist = minExtent - data.move; timeline.move(data.move, minExtent - dist/2, QEasingCurve(QEasingCurve::InQuad), fixupDuration/4); timeline.move(data.move, minExtent, QEasingCurve(QEasingCurve::OutExpo), 3*fixupDuration/4); } else { timeline.set(data.move, minExtent); } } } else if (data.move.value() < maxExtent) { timeline.reset(data.move); if (fixupDuration) { qreal dist = maxExtent - data.move; timeline.move(data.move, maxExtent - dist/2, QEasingCurve(QEasingCurve::InQuad), fixupDuration/4); timeline.move(data.move, maxExtent, QEasingCurve(QEasingCurve::OutExpo), 3*fixupDuration/4); } else { timeline.set(data.move, maxExtent); } } vTime = timeline.time(); } void QDeclarativeFlickablePrivate::updateBeginningEnd() { Q_Q(QDeclarativeFlickable); bool atBoundaryChange = false; // Vertical const int maxyextent = int(-q->maxYExtent()); const qreal ypos = -vData.move.value(); bool atBeginning = (ypos <= -q->minYExtent()); bool atEnd = (maxyextent <= ypos); if (atBeginning != vData.atBeginning) { vData.atBeginning = atBeginning; atBoundaryChange = true; } if (atEnd != vData.atEnd) { vData.atEnd = atEnd; atBoundaryChange = true; } // Horizontal const int maxxextent = int(-q->maxXExtent()); const qreal xpos = -hData.move.value(); atBeginning = (xpos <= -q->minXExtent()); atEnd = (maxxextent <= xpos); if (atBeginning != hData.atBeginning) { hData.atBeginning = atBeginning; atBoundaryChange = true; } if (atEnd != hData.atEnd) { hData.atEnd = atEnd; atBoundaryChange = true; } if (atBoundaryChange) emit q->isAtBoundaryChanged(); if (visibleArea) visibleArea->updateVisible(); } /*! \qmlclass Flickable QDeclarativeFlickable \since 4.7 \ingroup qml-basic-interaction-elements \brief The Flickable item provides a surface that can be "flicked". \inherits Item The Flickable item places its children on a surface that can be dragged and flicked, causing the view onto the child items to scroll. This behavior forms the basis of Items that are designed to show large numbers of child items, such as \l ListView and \l GridView. In traditional user interfaces, views can be scrolled using standard controls, such as scroll bars and arrow buttons. In some situations, it is also possible to drag the view directly by pressing and holding a mouse button while moving the cursor. In touch-based user interfaces, this dragging action is often complemented with a flicking action, where scrolling continues after the user has stopped touching the view. Flickable does not automatically clip its contents. If it is not used as a full-screen item, you should consider setting the \l{Item::}{clip} property to true. \section1 Example Usage \beginfloatright \inlineimage flickable.gif \endfloat The following example shows a small view onto a large image in which the user can drag or flick the image in order to view different parts of it. \snippet doc/src/snippets/declarative/flickable.qml document \clearfloat Items declared as children of a Flickable are automatically parented to the Flickable's \l contentItem. This should be taken into account when operating on the children of the Flickable; it is usually the children of \c contentItem that are relevant. For example, the bound of Items added to the Flickable will be available by \c contentItem.childrenRect \section1 Limitations \note Due to an implementation detail, items placed inside a Flickable cannot anchor to it by \c id. Use \c parent instead. */ /*! \qmlsignal Flickable::onMovementStarted() This handler is called when the view begins moving due to user interaction. */ /*! \qmlsignal Flickable::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 Flickable::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 Flickable::onFlickEnded() This handler is called when the view stops moving due to a flick. */ /*! \qmlproperty real Flickable::visibleArea.xPosition \qmlproperty real Flickable::visibleArea.widthRatio \qmlproperty real Flickable::visibleArea.yPosition \qmlproperty real Flickable::visibleArea.heightRatio These properties describe the position and size of the currently viewed area. The size is defined as the percentage of the full view currently visible, scaled to 0.0 - 1.0. The page position is usually in the range 0.0 (beginning) to 1.0 minus size ratio (end), i.e. \c yPosition is in the range 0.0 to 1.0-\c heightRatio. However, it is possible for the contents to be dragged outside of the normal range, resulting in the page positions also being outside the normal range. These properties are typically used to draw a scrollbar. For example: \snippet doc/src/snippets/declarative/flickableScrollbar.qml 0 \dots 8 \snippet doc/src/snippets/declarative/flickableScrollbar.qml 1 \sa {declarative/ui-components/scrollbar}{scrollbar example} */ QDeclarativeFlickable::QDeclarativeFlickable(QDeclarativeItem *parent) : QDeclarativeItem(*(new QDeclarativeFlickablePrivate), parent) { Q_D(QDeclarativeFlickable); d->init(); } QDeclarativeFlickable::QDeclarativeFlickable(QDeclarativeFlickablePrivate &dd, QDeclarativeItem *parent) : QDeclarativeItem(dd, parent) { Q_D(QDeclarativeFlickable); d->init(); } QDeclarativeFlickable::~QDeclarativeFlickable() { } /*! \qmlproperty real Flickable::contentX \qmlproperty real Flickable::contentY These properties hold the surface coordinate currently at the top-left corner of the Flickable. For example, if you flick an image up 100 pixels, \c contentY will be 100. */ qreal QDeclarativeFlickable::contentX() const { Q_D(const QDeclarativeFlickable); return -d->contentItem->x(); } void QDeclarativeFlickable::setContentX(qreal pos) { Q_D(QDeclarativeFlickable); d->timeline.reset(d->hData.move); d->vTime = d->timeline.time(); movementXEnding(); if (-pos != d->hData.move.value()) { d->hData.move.setValue(-pos); viewportMoved(); } } qreal QDeclarativeFlickable::contentY() const { Q_D(const QDeclarativeFlickable); return -d->contentItem->y(); } void QDeclarativeFlickable::setContentY(qreal pos) { Q_D(QDeclarativeFlickable); d->timeline.reset(d->vData.move); d->vTime = d->timeline.time(); movementYEnding(); if (-pos != d->vData.move.value()) { d->vData.move.setValue(-pos); viewportMoved(); } } /*! \qmlproperty bool Flickable::interactive This property describes whether the user can interact with the Flickable. A user cannot drag or flick a Flickable that is not interactive. By default, this property is true. This property is useful for temporarily disabling flicking. This allows special interaction with Flickable's children; for example, you might want to freeze a flickable map while scrolling through a pop-up dialog that is a child of the Flickable. */ bool QDeclarativeFlickable::isInteractive() const { Q_D(const QDeclarativeFlickable); return d->interactive; } void QDeclarativeFlickable::setInteractive(bool interactive) { Q_D(QDeclarativeFlickable); if (interactive != d->interactive) { d->interactive = interactive; if (!interactive && (d->flickingHorizontally || d->flickingVertically)) { d->timeline.clear(); d->vTime = d->timeline.time(); d->flickingHorizontally = false; d->flickingVertically = false; emit flickingChanged(); emit flickingHorizontallyChanged(); emit flickingVerticallyChanged(); emit flickEnded(); } emit interactiveChanged(); } } /*! \qmlproperty real Flickable::horizontalVelocity \qmlproperty real Flickable::verticalVelocity The instantaneous velocity of movement along the x and y axes, in pixels/sec. The reported velocity is smoothed to avoid erratic output. */ qreal QDeclarativeFlickable::horizontalVelocity() const { Q_D(const QDeclarativeFlickable); return d->hData.smoothVelocity.value(); } qreal QDeclarativeFlickable::verticalVelocity() const { Q_D(const QDeclarativeFlickable); return d->vData.smoothVelocity.value(); } /*! \qmlproperty bool Flickable::atXBeginning \qmlproperty bool Flickable::atXEnd \qmlproperty bool Flickable::atYBeginning \qmlproperty bool Flickable::atYEnd These properties are true if the flickable view is positioned at the beginning, or end respecively. */ bool QDeclarativeFlickable::isAtXEnd() const { Q_D(const QDeclarativeFlickable); return d->hData.atEnd; } bool QDeclarativeFlickable::isAtXBeginning() const { Q_D(const QDeclarativeFlickable); return d->hData.atBeginning; } bool QDeclarativeFlickable::isAtYEnd() const { Q_D(const QDeclarativeFlickable); return d->vData.atEnd; } bool QDeclarativeFlickable::isAtYBeginning() const { Q_D(const QDeclarativeFlickable); return d->vData.atBeginning; } void QDeclarativeFlickable::ticked() { viewportMoved(); } /*! \qmlproperty Item Flickable::contentItem The internal item that contains the Items to be moved in the Flickable. Items declared as children of a Flickable are automatically parented to the Flickable's contentItem. Items created dynamically need to be explicitly parented to the \e contentItem: \code Flickable { id: myFlickable function addItem(file) { var component = Qt.createComponent(file) component.createObject(myFlickable.contentItem); } } \endcode */ QDeclarativeItem *QDeclarativeFlickable::contentItem() { Q_D(QDeclarativeFlickable); return d->contentItem; } QDeclarativeFlickableVisibleArea *QDeclarativeFlickable::visibleArea() { Q_D(QDeclarativeFlickable); if (!d->visibleArea) d->visibleArea = new QDeclarativeFlickableVisibleArea(this); return d->visibleArea; } /*! \qmlproperty enumeration Flickable::flickableDirection This property determines which directions the view can be flicked. \list \o Flickable.AutoFlickDirection (default) - allows flicking vertically if the \e contentHeight is not equal to the \e height of the Flickable. Allows flicking horizontally if the \e contentWidth is not equal to the \e width of the Flickable. \o Flickable.HorizontalFlick - allows flicking horizontally. \o Flickable.VerticalFlick - allows flicking vertically. \o Flickable.HorizontalAndVerticalFlick - allows flicking in both directions. \endlist */ QDeclarativeFlickable::FlickableDirection QDeclarativeFlickable::flickableDirection() const { Q_D(const QDeclarativeFlickable); return d->flickableDirection; } void QDeclarativeFlickable::setFlickableDirection(FlickableDirection direction) { Q_D(QDeclarativeFlickable); if (direction != d->flickableDirection) { d->flickableDirection = direction; emit flickableDirectionChanged(); } } void QDeclarativeFlickablePrivate::handleMousePressEvent(QGraphicsSceneMouseEvent *event) { Q_Q(QDeclarativeFlickable); if (interactive && timeline.isActive() && (qAbs(hData.velocity) > 10 || qAbs(vData.velocity) > 10)) stealMouse = true; // If we've been flicked then steal the click. else stealMouse = false; q->setKeepMouseGrab(stealMouse); pressed = true; timeline.clear(); hData.velocity = 0; vData.velocity = 0; hData.dragStartOffset = 0; vData.dragStartOffset = 0; lastPos = QPoint(); QDeclarativeItemPrivate::start(lastPosTime); pressPos = event->pos(); hData.pressPos = hData.move.value(); vData.pressPos = vData.move.value(); flickingHorizontally = false; flickingVertically = false; QDeclarativeItemPrivate::start(pressTime); QDeclarativeItemPrivate::start(velocityTime); } void QDeclarativeFlickablePrivate::handleMouseMoveEvent(QGraphicsSceneMouseEvent *event) { Q_Q(QDeclarativeFlickable); if (!interactive || !lastPosTime.isValid()) return; bool rejectY = false; bool rejectX = false; bool stealY = stealMouse; bool stealX = stealMouse; if (q->yflick()) { int dy = int(event->pos().y() - pressPos.y()); if (qAbs(dy) > QApplication::startDragDistance() || QDeclarativeItemPrivate::elapsed(pressTime) > 200) { if (!vMoved) vData.dragStartOffset = dy; qreal newY = dy + vData.pressPos - vData.dragStartOffset; const qreal minY = q->minYExtent(); const qreal maxY = q->maxYExtent(); if (newY > minY) newY = minY + (newY - minY) / 2; if (newY < maxY && maxY - minY <= 0) newY = maxY + (newY - maxY) / 2; if (boundsBehavior == QDeclarativeFlickable::StopAtBounds && (newY > minY || newY < maxY)) { rejectY = true; if (newY < maxY) { newY = maxY; rejectY = false; } if (newY > minY) { newY = minY; rejectY = false; } } if (!rejectY && stealMouse) { vData.move.setValue(qRound(newY)); vMoved = true; } if (qAbs(dy) > QApplication::startDragDistance()) stealY = true; } } if (q->xflick()) { int dx = int(event->pos().x() - pressPos.x()); if (qAbs(dx) > QApplication::startDragDistance() || QDeclarativeItemPrivate::elapsed(pressTime) > 200) { if (!hMoved) hData.dragStartOffset = dx; qreal newX = dx + hData.pressPos - hData.dragStartOffset; const qreal minX = q->minXExtent(); const qreal maxX = q->maxXExtent(); if (newX > minX) newX = minX + (newX - minX) / 2; if (newX < maxX && maxX - minX <= 0) newX = maxX + (newX - maxX) / 2; if (boundsBehavior == QDeclarativeFlickable::StopAtBounds && (newX > minX || newX < maxX)) { rejectX = true; if (newX < maxX) { newX = maxX; rejectX = false; } if (newX > minX) { newX = minX; rejectX = false; } } if (!rejectX && stealMouse) { hData.move.setValue(qRound(newX)); hMoved = true; } if (qAbs(dx) > QApplication::startDragDistance()) stealX = true; } } stealMouse = stealX || stealY; if (stealMouse) q->setKeepMouseGrab(true); if (!lastPos.isNull()) { qreal elapsed = qreal(QDeclarativeItemPrivate::restart(lastPosTime)) / 1000.; if (elapsed <= 0) elapsed = 1; if (q->yflick()) { qreal diff = event->pos().y() - lastPos.y(); // average to reduce the effect of spurious moves vData.velocity += diff / elapsed; vData.velocity /= 2; } if (q->xflick()) { qreal diff = event->pos().x() - lastPos.x(); // average to reduce the effect of spurious moves hData.velocity += diff / elapsed; hData.velocity /= 2; } } if (rejectY) vData.velocity = 0; if (rejectX) hData.velocity = 0; if (hMoved || vMoved) { q->movementStarting(); q->viewportMoved(); } lastPos = event->pos(); } void QDeclarativeFlickablePrivate::handleMouseReleaseEvent(QGraphicsSceneMouseEvent *event) { Q_Q(QDeclarativeFlickable); stealMouse = false; q->setKeepMouseGrab(false); pressed = false; if (!lastPosTime.isValid()) return; if (QDeclarativeItemPrivate::elapsed(lastPosTime) > 100) { // if we drag then pause before release we should not cause a flick. hData.velocity = 0.0; vData.velocity = 0.0; } vTime = timeline.time(); if (qAbs(vData.velocity) > MinimumFlickVelocity && qAbs(event->pos().y() - pressPos.y()) > FlickThreshold) flickY(vData.velocity); else fixupY(); if (qAbs(hData.velocity) > MinimumFlickVelocity && qAbs(event->pos().x() - pressPos.x()) > FlickThreshold) flickX(hData.velocity); else fixupX(); lastPosTime.invalidate(); if (!timeline.isActive()) q->movementEnding(); } void QDeclarativeFlickable::mousePressEvent(QGraphicsSceneMouseEvent *event) { Q_D(QDeclarativeFlickable); if (d->interactive) { d->handleMousePressEvent(event); event->accept(); } else { QDeclarativeItem::mousePressEvent(event); } } void QDeclarativeFlickable::mouseMoveEvent(QGraphicsSceneMouseEvent *event) { Q_D(QDeclarativeFlickable); if (d->interactive) { d->handleMouseMoveEvent(event); event->accept(); } else { QDeclarativeItem::mouseMoveEvent(event); } } void QDeclarativeFlickable::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) { Q_D(QDeclarativeFlickable); if (d->interactive) { d->clearDelayedPress(); d->handleMouseReleaseEvent(event); event->accept(); ungrabMouse(); } else { QDeclarativeItem::mouseReleaseEvent(event); } } void QDeclarativeFlickable::wheelEvent(QGraphicsSceneWheelEvent *event) { Q_D(QDeclarativeFlickable); if (!d->interactive) { QDeclarativeItem::wheelEvent(event); } else if (yflick()) { if (event->delta() > 0) d->vData.velocity = qMax(event->delta() - d->vData.smoothVelocity.value(), qreal(250.0)); else d->vData.velocity = qMin(event->delta() - d->vData.smoothVelocity.value(), qreal(-250.0)); d->flickingVertically = false; d->flickY(d->vData.velocity); if (d->flickingVertically) { d->vMoved = true; movementStarting(); } event->accept(); } else if (xflick()) { if (event->delta() > 0) d->hData.velocity = qMax(event->delta() - d->hData.smoothVelocity.value(), qreal(250.0)); else d->hData.velocity = qMin(event->delta() - d->hData.smoothVelocity.value(), qreal(-250.0)); d->flickingHorizontally = false; d->flickX(d->hData.velocity); if (d->flickingHorizontally) { d->hMoved = true; movementStarting(); } event->accept(); } else { QDeclarativeItem::wheelEvent(event); } } void QDeclarativeFlickablePrivate::captureDelayedPress(QGraphicsSceneMouseEvent *event) { Q_Q(QDeclarativeFlickable); if (!q->scene() || pressDelay <= 0) return; delayedPressTarget = q->scene()->mouseGrabberItem(); delayedPressEvent = new QGraphicsSceneMouseEvent(event->type()); delayedPressEvent->setAccepted(false); for (int i = 0x1; i <= 0x10; i <<= 1) { if (event->buttons() & i) { Qt::MouseButton button = Qt::MouseButton(i); delayedPressEvent->setButtonDownPos(button, event->buttonDownPos(button)); delayedPressEvent->setButtonDownScenePos(button, event->buttonDownScenePos(button)); delayedPressEvent->setButtonDownScreenPos(button, event->buttonDownScreenPos(button)); } } delayedPressEvent->setButtons(event->buttons()); delayedPressEvent->setButton(event->button()); delayedPressEvent->setPos(event->pos()); delayedPressEvent->setScenePos(event->scenePos()); delayedPressEvent->setScreenPos(event->screenPos()); delayedPressEvent->setLastPos(event->lastPos()); delayedPressEvent->setLastScenePos(event->lastScenePos()); delayedPressEvent->setLastScreenPos(event->lastScreenPos()); delayedPressEvent->setModifiers(event->modifiers()); delayedPressTimer.start(pressDelay, q); } void QDeclarativeFlickablePrivate::clearDelayedPress() { if (delayedPressEvent) { delayedPressTimer.stop(); delete delayedPressEvent; delayedPressEvent = 0; } } void QDeclarativeFlickablePrivate::setRoundedViewportX(qreal x) { contentItem->setX(qRound(x)); } void QDeclarativeFlickablePrivate::setRoundedViewportY(qreal y) { contentItem->setY(qRound(y)); } void QDeclarativeFlickable::timerEvent(QTimerEvent *event) { Q_D(QDeclarativeFlickable); if (event->timerId() == d->delayedPressTimer.timerId()) { d->delayedPressTimer.stop(); if (d->delayedPressEvent) { QDeclarativeItem *grabber = scene() ? qobject_cast(scene()->mouseGrabberItem()) : 0; if (!grabber || grabber != this) { // We replay the mouse press but the grabber we had might not be interessted by the event (e.g. overlay) // so we reset the grabber if (scene()->mouseGrabberItem() == d->delayedPressTarget) d->delayedPressTarget->ungrabMouse(); //Use the event handler that will take care of finding the proper item to propagate the event QApplication::sendEvent(scene(), d->delayedPressEvent); } delete d->delayedPressEvent; d->delayedPressEvent = 0; } } } qreal QDeclarativeFlickable::minYExtent() const { return 0.0; } qreal QDeclarativeFlickable::minXExtent() const { return 0.0; } /* returns -ve */ qreal QDeclarativeFlickable::maxXExtent() const { return width() - vWidth(); } /* returns -ve */ qreal QDeclarativeFlickable::maxYExtent() const { return height() - vHeight(); } void QDeclarativeFlickable::viewportMoved() { Q_D(QDeclarativeFlickable); qreal prevX = d->lastFlickablePosition.x(); qreal prevY = d->lastFlickablePosition.y(); d->velocityTimeline.clear(); if (d->pressed || d->calcVelocity) { int elapsed = QDeclarativeItemPrivate::restart(d->velocityTime); if (elapsed > 0) { qreal horizontalVelocity = (prevX - d->hData.move.value()) * 1000 / elapsed; qreal verticalVelocity = (prevY - d->vData.move.value()) * 1000 / elapsed; d->velocityTimeline.move(d->hData.smoothVelocity, horizontalVelocity, d->reportedVelocitySmoothing); d->velocityTimeline.move(d->hData.smoothVelocity, 0, d->reportedVelocitySmoothing); d->velocityTimeline.move(d->vData.smoothVelocity, verticalVelocity, d->reportedVelocitySmoothing); d->velocityTimeline.move(d->vData.smoothVelocity, 0, d->reportedVelocitySmoothing); } } else { if (d->timeline.time() > d->vTime) { qreal horizontalVelocity = (prevX - d->hData.move.value()) * 1000 / (d->timeline.time() - d->vTime); qreal verticalVelocity = (prevY - d->vData.move.value()) * 1000 / (d->timeline.time() - d->vTime); d->hData.smoothVelocity.setValue(horizontalVelocity); d->vData.smoothVelocity.setValue(verticalVelocity); } } d->lastFlickablePosition = QPointF(d->hData.move.value(), d->vData.move.value()); d->vTime = d->timeline.time(); d->updateBeginningEnd(); } void QDeclarativeFlickable::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) { Q_D(QDeclarativeFlickable); QDeclarativeItem::geometryChanged(newGeometry, oldGeometry); bool changed = false; if (newGeometry.width() != oldGeometry.width()) { if (xflick()) changed = true; if (d->hData.viewSize < 0) { d->contentItem->setWidth(width()); emit contentWidthChanged(); } // Make sure that we're entirely in view. if (!d->pressed && !d->movingHorizontally && !d->movingVertically) { int oldDuration = d->fixupDuration; d->fixupDuration = 0; d->fixupX(); d->fixupDuration = oldDuration; } } if (newGeometry.height() != oldGeometry.height()) { if (yflick()) changed = true; if (d->vData.viewSize < 0) { d->contentItem->setHeight(height()); emit contentHeightChanged(); } // Make sure that we're entirely in view. if (!d->pressed && !d->movingHorizontally && !d->movingVertically) { int oldDuration = d->fixupDuration; d->fixupDuration = 0; d->fixupY(); d->fixupDuration = oldDuration; } } if (changed) d->updateBeginningEnd(); } void QDeclarativeFlickable::cancelFlick() { Q_D(QDeclarativeFlickable); d->timeline.reset(d->hData.move); d->timeline.reset(d->vData.move); movementEnding(); } void QDeclarativeFlickablePrivate::data_append(QDeclarativeListProperty *prop, QObject *o) { QGraphicsObject *i = qobject_cast(o); if (i) { QGraphicsItemPrivate *d = QGraphicsItemPrivate::get(i); if (static_cast(d)->componentComplete) { i->setParentItem(static_cast(prop->data)->contentItem); } else { d->setParentItemHelper(static_cast(prop->data)->contentItem, 0, 0); } } else { o->setParent(prop->object); } } int QDeclarativeFlickablePrivate::data_count(QDeclarativeListProperty *property) { QDeclarativeItem *contentItem= static_cast(property->data)->contentItem; return contentItem->childItems().count() + contentItem->children().count(); } QObject *QDeclarativeFlickablePrivate::data_at(QDeclarativeListProperty *property, int index) { QDeclarativeItem *contentItem = static_cast(property->data)->contentItem; int childItemCount = contentItem->childItems().count(); if (index < 0) return 0; if (index < childItemCount) { return contentItem->childItems().at(index)->toGraphicsObject(); } else { return contentItem->children().at(index - childItemCount); } return 0; } void QDeclarativeFlickablePrivate::data_clear(QDeclarativeListProperty *property) { QDeclarativeItem *contentItem = static_cast(property->data)->contentItem; const QList graphicsItems = contentItem->childItems(); for (int i = 0; i < graphicsItems.count(); i++) contentItem->scene()->removeItem(graphicsItems[i]); const QList objects = contentItem->children(); for (int i = 0; i < objects.count(); i++) objects[i]->setParent(0); } QDeclarativeListProperty QDeclarativeFlickable::flickableData() { Q_D(QDeclarativeFlickable); return QDeclarativeListProperty(this, (void *)d, QDeclarativeFlickablePrivate::data_append, QDeclarativeFlickablePrivate::data_count, QDeclarativeFlickablePrivate::data_at, QDeclarativeFlickablePrivate::data_clear); } QDeclarativeListProperty QDeclarativeFlickable::flickableChildren() { Q_D(QDeclarativeFlickable); return QGraphicsItemPrivate::get(d->contentItem)->childrenList(); } /*! \qmlproperty enumeration Flickable::boundsBehavior This property holds whether the surface may be dragged beyond the Fickable's boundaries, or overshoot the Flickable's boundaries when flicked. This enables the feeling that the edges of the view are soft, rather than a hard physical boundary. The \c boundsBehavior can be one of: \list \o Flickable.StopAtBounds - the contents can not be dragged beyond the boundary of the flickable, and flicks will not overshoot. \o Flickable.DragOverBounds - the contents can be dragged beyond the boundary of the Flickable, but flicks will not overshoot. \o Flickable.DragAndOvershootBounds (default) - the contents can be dragged beyond the boundary of the Flickable, and can overshoot the boundary when flicked. \endlist */ QDeclarativeFlickable::BoundsBehavior QDeclarativeFlickable::boundsBehavior() const { Q_D(const QDeclarativeFlickable); return d->boundsBehavior; } void QDeclarativeFlickable::setBoundsBehavior(BoundsBehavior b) { Q_D(QDeclarativeFlickable); if (b == d->boundsBehavior) return; d->boundsBehavior = b; emit boundsBehaviorChanged(); } /*! \qmlproperty real Flickable::contentWidth \qmlproperty real Flickable::contentHeight The dimensions of the content (the surface controlled by Flickable). This should typically be set to the combined size of the items placed in the Flickable. The following snippet shows how these properties are used to display an image that is larger than the Flickable item itself: \snippet doc/src/snippets/declarative/flickable.qml document In some cases, the the content dimensions can be automatically set using the \l {Item::childrenRect.width}{childrenRect.width} and \l {Item::childrenRect.height}{childrenRect.height} properties. */ qreal QDeclarativeFlickable::contentWidth() const { Q_D(const QDeclarativeFlickable); return d->hData.viewSize; } void QDeclarativeFlickable::setContentWidth(qreal w) { Q_D(QDeclarativeFlickable); if (d->hData.viewSize == w) return; d->hData.viewSize = w; if (w < 0) d->contentItem->setWidth(width()); else d->contentItem->setWidth(w); // Make sure that we're entirely in view. if (!d->pressed && !d->movingHorizontally && !d->movingVertically) { int oldDuration = d->fixupDuration; d->fixupDuration = 0; d->fixupX(); d->fixupDuration = oldDuration; } emit contentWidthChanged(); d->updateBeginningEnd(); } qreal QDeclarativeFlickable::contentHeight() const { Q_D(const QDeclarativeFlickable); return d->vData.viewSize; } void QDeclarativeFlickable::setContentHeight(qreal h) { Q_D(QDeclarativeFlickable); if (d->vData.viewSize == h) return; d->vData.viewSize = h; if (h < 0) d->contentItem->setHeight(height()); else d->contentItem->setHeight(h); // Make sure that we're entirely in view. if (!d->pressed && !d->movingHorizontally && !d->movingVertically) { int oldDuration = d->fixupDuration; d->fixupDuration = 0; d->fixupY(); d->fixupDuration = oldDuration; } emit contentHeightChanged(); d->updateBeginningEnd(); } qreal QDeclarativeFlickable::vWidth() const { Q_D(const QDeclarativeFlickable); if (d->hData.viewSize < 0) return width(); else return d->hData.viewSize; } qreal QDeclarativeFlickable::vHeight() const { Q_D(const QDeclarativeFlickable); if (d->vData.viewSize < 0) return height(); else return d->vData.viewSize; } bool QDeclarativeFlickable::xflick() const { Q_D(const QDeclarativeFlickable); if (d->flickableDirection == QDeclarativeFlickable::AutoFlickDirection) return vWidth() != width(); return d->flickableDirection & QDeclarativeFlickable::HorizontalFlick; } bool QDeclarativeFlickable::yflick() const { Q_D(const QDeclarativeFlickable); if (d->flickableDirection == QDeclarativeFlickable::AutoFlickDirection) return vHeight() != height(); return d->flickableDirection & QDeclarativeFlickable::VerticalFlick; } bool QDeclarativeFlickable::sendMouseEvent(QGraphicsSceneMouseEvent *event) { Q_D(QDeclarativeFlickable); QGraphicsSceneMouseEvent mouseEvent(event->type()); QRectF myRect = mapToScene(QRectF(0, 0, width(), height())).boundingRect(); QGraphicsScene *s = scene(); QDeclarativeItem *grabber = s ? qobject_cast(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: if (d->delayedPressEvent) return false; d->handleMousePressEvent(&mouseEvent); d->captureDelayedPress(event); stealThisEvent = d->stealMouse; // Update stealThisEvent in case changed by function call above break; case QEvent::GraphicsSceneMouseRelease: if (d->delayedPressEvent) { // We replay the mouse press but the grabber we had might not be interessted by the event (e.g. overlay) // so we reset the grabber if (s->mouseGrabberItem() == d->delayedPressTarget) d->delayedPressTarget->ungrabMouse(); //Use the event handler that will take care of finding the proper item to propagate the event QApplication::sendEvent(scene(), d->delayedPressEvent); d->clearDelayedPress(); // We send the release scene()->sendEvent(s->mouseGrabberItem(), event); // And the event has been consumed return true; } d->handleMouseReleaseEvent(&mouseEvent); break; default: break; } grabber = qobject_cast(s->mouseGrabberItem()); if (grabber && stealThisEvent && !grabber->keepMouseGrab() && grabber != this) { d->clearDelayedPress(); grabMouse(); } return stealThisEvent || d->delayedPressEvent; } else if (d->lastPosTime.isValid()) { d->lastPosTime.invalidate(); } if (mouseEvent.type() == QEvent::GraphicsSceneMouseRelease) { d->clearDelayedPress(); d->stealMouse = false; d->pressed = false; } return false; } bool QDeclarativeFlickable::sceneEventFilter(QGraphicsItem *i, QEvent *e) { Q_D(QDeclarativeFlickable); 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(e)); default: break; } return QDeclarativeItem::sceneEventFilter(i, e); } /*! \qmlproperty real Flickable::maximumFlickVelocity This property holds the maximum velocity that the user can flick the view in pixels/second. The default is 2000 pixels/s */ qreal QDeclarativeFlickable::maximumFlickVelocity() const { Q_D(const QDeclarativeFlickable); return d->maxVelocity; } void QDeclarativeFlickable::setMaximumFlickVelocity(qreal v) { Q_D(QDeclarativeFlickable); if (v == d->maxVelocity) return; d->maxVelocity = v; emit maximumFlickVelocityChanged(); } /*! \qmlproperty real Flickable::flickDeceleration This property holds the rate at which a flick will decelerate. The default is 500. */ qreal QDeclarativeFlickable::flickDeceleration() const { Q_D(const QDeclarativeFlickable); return d->deceleration; } void QDeclarativeFlickable::setFlickDeceleration(qreal deceleration) { Q_D(QDeclarativeFlickable); if (deceleration == d->deceleration) return; d->deceleration = deceleration; emit flickDecelerationChanged(); } bool QDeclarativeFlickable::isFlicking() const { Q_D(const QDeclarativeFlickable); return d->flickingHorizontally || d->flickingVertically; } /*! \qmlproperty bool Flickable::flicking \qmlproperty bool Flickable::flickingHorizontally \qmlproperty bool Flickable::flickingVertically These properties describe whether the view is currently moving horizontally, vertically or in either direction, due to the user flicking the view. */ bool QDeclarativeFlickable::isFlickingHorizontally() const { Q_D(const QDeclarativeFlickable); return d->flickingHorizontally; } bool QDeclarativeFlickable::isFlickingVertically() const { Q_D(const QDeclarativeFlickable); return d->flickingVertically; } /*! \qmlproperty int Flickable::pressDelay This property holds the time to delay (ms) delivering a press to children of the Flickable. This can be useful where reacting to a press before a flicking action has undesirable effects. If the flickable is dragged/flicked before the delay times out the press event will not be delivered. If the button is released within the timeout, both the press and release will be delivered. */ int QDeclarativeFlickable::pressDelay() const { Q_D(const QDeclarativeFlickable); return d->pressDelay; } void QDeclarativeFlickable::setPressDelay(int delay) { Q_D(QDeclarativeFlickable); if (d->pressDelay == delay) return; d->pressDelay = delay; emit pressDelayChanged(); } bool QDeclarativeFlickable::isMoving() const { Q_D(const QDeclarativeFlickable); return d->movingHorizontally || d->movingVertically; } /*! \qmlproperty bool Flickable::moving \qmlproperty bool Flickable::movingHorizontally \qmlproperty bool Flickable::movingVertically These properties describe whether the view is currently moving horizontally, vertically or in either direction, due to the user either dragging or flicking the view. */ bool QDeclarativeFlickable::isMovingHorizontally() const { Q_D(const QDeclarativeFlickable); return d->movingHorizontally; } bool QDeclarativeFlickable::isMovingVertically() const { Q_D(const QDeclarativeFlickable); return d->movingVertically; } void QDeclarativeFlickable::movementStarting() { Q_D(QDeclarativeFlickable); if (d->hMoved && !d->movingHorizontally) { d->movingHorizontally = true; emit movingChanged(); emit movingHorizontallyChanged(); if (!d->movingVertically) emit movementStarted(); } else if (d->vMoved && !d->movingVertically) { d->movingVertically = true; emit movingChanged(); emit movingVerticallyChanged(); if (!d->movingHorizontally) emit movementStarted(); } } void QDeclarativeFlickable::movementEnding() { Q_D(QDeclarativeFlickable); movementXEnding(); movementYEnding(); d->hData.smoothVelocity.setValue(0); d->vData.smoothVelocity.setValue(0); } void QDeclarativeFlickable::movementXEnding() { Q_D(QDeclarativeFlickable); if (d->flickingHorizontally) { d->flickingHorizontally = false; emit flickingChanged(); emit flickingHorizontallyChanged(); if (!d->flickingVertically) emit flickEnded(); } if (!d->pressed && !d->stealMouse) { if (d->movingHorizontally) { d->movingHorizontally = false; d->hMoved = false; emit movingChanged(); emit movingHorizontallyChanged(); if (!d->movingVertically) emit movementEnded(); } } } void QDeclarativeFlickable::movementYEnding() { Q_D(QDeclarativeFlickable); if (d->flickingVertically) { d->flickingVertically = false; emit flickingChanged(); emit flickingVerticallyChanged(); if (!d->flickingHorizontally) emit flickEnded(); } if (!d->pressed && !d->stealMouse) { if (d->movingVertically) { d->movingVertically = false; d->vMoved = false; emit movingChanged(); emit movingVerticallyChanged(); if (!d->movingHorizontally) emit movementEnded(); } } } void QDeclarativeFlickablePrivate::updateVelocity() { Q_Q(QDeclarativeFlickable); emit q->horizontalVelocityChanged(); emit q->verticalVelocityChanged(); } QT_END_NAMESPACE