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Diffstat (limited to 'src/location/declarativemaps/qquickgeomapgesturearea.cpp')
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diff --git a/src/location/declarativemaps/qquickgeomapgesturearea.cpp b/src/location/declarativemaps/qquickgeomapgesturearea.cpp new file mode 100644 index 00000000..7b9a48f1 --- /dev/null +++ b/src/location/declarativemaps/qquickgeomapgesturearea.cpp @@ -0,0 +1,1288 @@ +/**************************************************************************** +** +** Copyright (C) 2015 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the QtLocation module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL3$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see http://www.qt.io/terms-conditions. For further +** information use the contact form at http://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPLv3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or later 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 2.0 requirements will be +** met: http://www.gnu.org/licenses/gpl-2.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qquickgeomapgesturearea_p.h" +#include "qquickgeocoordinateanimation_p.h" +#include "qdeclarativegeomap_p.h" +#include "error_messages.h" + +#include <QtGui/QGuiApplication> +#include <QtGui/qevent.h> +#include <QtGui/QWheelEvent> +#include <QtGui/QStyleHints> +#include <QtQml/qqmlinfo.h> +#include <QtQuick/QQuickWindow> +#include <QPropertyAnimation> +#include <QDebug> +#include "math.h" +#include "qgeomap_p.h" +#include "qdoublevector2d_p.h" + +#define QML_MAP_FLICK_DEFAULTMAXVELOCITY 2500 +#define QML_MAP_FLICK_MINIMUMDECELERATION 500 +#define QML_MAP_FLICK_DEFAULTDECELERATION 2500 +#define QML_MAP_FLICK_MAXIMUMDECELERATION 10000 + +#define QML_MAP_FLICK_VELOCITY_SAMPLE_PERIOD 50 +// FlickThreshold determines how far the "mouse" must have moved +// before we perform a flick. +static const int FlickThreshold = 20; +// Really slow flicks can be annoying. +const qreal MinimumFlickVelocity = 75.0; + +QT_BEGIN_NAMESPACE + + +/*! + \qmltype MapPinchEvent + \instantiates QGeoMapPinchEvent + \inqmlmodule QtLocation + + \brief MapPinchEvent type provides basic information about pinch event. + + MapPinchEvent type provides basic information about pinch event. They are + present in handlers of MapPinch (for example pinchStarted/pinchUpdated). Events are only + guaranteed to be valid for the duration of the handler. + + Except for the \l accepted property, all properties are read-only. + + \section2 Example Usage + + The following example enables the pinch gesture on a map and reacts to the + finished event. + + \code + Map { + id: map + gesture.enabled: true + gesture.onPinchFinished:{ + var coordinate1 = map.toCoordinate(gesture.point1) + var coordinate2 = map.toCoordinate(gesture.point2) + console.log("Pinch started at:") + console.log(" Points (" + gesture.point1.x + ", " + gesture.point1.y + ") - (" + gesture.point2.x + ", " + gesture.point2.y + ")") + console.log(" Coordinates (" + coordinate1.latitude + ", " + coordinate1.longitude + ") - (" + coordinate2.latitude + ", " + coordinate2.longitude + ")") + } + } + \endcode + + \ingroup qml-QtLocation5-maps + \since Qt Location 5.0 +*/ + +/*! + \qmlproperty QPoint QtLocation::MapPinchEvent::center + + This read-only property holds the current center point. +*/ + +/*! + \qmlproperty real QtLocation::MapPinchEvent::angle + + This read-only property holds the current angle between the two points in + the range -180 to 180. Positive values for the angles mean counter-clockwise + while negative values mean the clockwise direction. Zero degrees is at the + 3 o'clock position. +*/ + +/*! + \qmlproperty QPoint QtLocation::MapPinchEvent::point1 + \qmlproperty QPoint QtLocation::MapPinchEvent::point2 + + These read-only properties hold the actual touch points generating the pinch. + The points are not in any particular order. +*/ + +/*! + \qmlproperty int QtLocation::MapPinchEvent::pointCount + + This read-only property holds the number of points currently touched. + The MapPinch will not react until two touch points have initiated a gesture, + but will remain active until all touch points have been released. +*/ + +/*! + \qmlproperty bool QtLocation::MapPinchEvent::accepted + + Setting this property to false in the \c MapPinch::onPinchStarted handler + will result in no further pinch events being generated, and the gesture + ignored. +*/ + +/*! + \qmltype MapGestureArea + \instantiates QQuickGeoMapGestureArea + + \inqmlmodule QtLocation + + \brief The MapGestureArea type provides Map gesture interaction. + + MapGestureArea objects are used as part of a Map, to provide for panning, + flicking and pinch-to-zoom gesture used on touch displays. + + A MapGestureArea is automatically created with a new Map and available with + the \l{Map::gesture}{gesture} property. This is the only way + to create a MapGestureArea, and once created this way cannot be destroyed + without its parent Map. + + The two most commonly used properties of the MapGestureArea are the \l enabled + and \l acceptedGestures properties. Both of these must be set before a + MapGestureArea will have any effect upon interaction with the Map. + The \l flickDeceleration property controls how quickly the map pan slows after contact + is released while panning the map. + + \section2 Performance + + The MapGestureArea, when enabled, must process all incoming touch events in + order to track the shape and size of the "pinch". The overhead added on + touch events can be considered constant time. + + \section2 Example Usage + + The following example enables the pinch and pan gestures on the map, but not flicking. So the + map scrolling will halt immediately on releasing the mouse button / touch. + + \code + Map { + gesture.enabled: true + gesture.acceptedGestures: MapGestureArea.PinchGesture | MapGestureArea.PanGesture + } + \endcode + + \ingroup qml-QtLocation5-maps + \since Qt Location 5.0 +*/ + +/*! + \qmlproperty bool QtLocation::MapGestureArea::enabled + + This property holds whether the gestures are enabled. +*/ + +/*! + \qmlproperty bool QtLocation::MapGestureArea::pinchActive + + This read-only property holds whether pinch gesture is active. +*/ + +/*! + \qmlproperty bool QtLocation::MapGestureArea::panActive + + This read-only property holds whether pan gesture is active. + + \note Change notifications for this property were introduced in Qt 5.5. +*/ + +/*! + \qmlproperty real QtLocation::MapGestureArea::maximumZoomLevelChange + + This property holds the maximum zoom level change per pinch, essentially + meant to be used for setting the zoom sensitivity. + + It is an indicative measure calculated from the dimensions of the + map area, roughly corresponding how much zoom level could change with + maximum pinch zoom. Default value is 4.0, maximum value is 10.0 +*/ + +/*! + \qmlproperty real MapGestureArea::flickDeceleration + + This property holds the rate at which a flick will decelerate. + + The default value is 2500. +*/ + +/*! + \qmlsignal QtLocation::MapGestureArea::pinchStarted(PinchEvent event) + + This signal is emitted when a pinch gesture is started. + + The corresponding handler is \c onPinchStarted. + + \sa pinchUpdated, pinchFinished +*/ + +/*! + \qmlsignal QtLocation::MapGestureArea::pinchUpdated(PinchEvent event) + + This signal is emitted as the user's fingers move across the map, + after the \l pinchStarted signal is emitted. + + The corresponding handler is \c onPinchUpdated. + + \sa pinchStarted, pinchFinished +*/ + +/*! + \qmlsignal QtLocation::MapGestureArea::pinchFinished(PinchEvent event) + + This signal is emitted at the end of a pinch gesture. + + The corresponding handler is \c onPinchFinished. + + \sa pinchStarted, pinchUpdated +*/ + +/*! + \qmlsignal QtLocation::MapGestureArea::panStarted() + + This signal is emitted when the map begins to move due to user + interaction. Typically this means that the user is dragging a finger - + or a mouse with one of more mouse buttons pressed - on the map. + + The corresponding handler is \c onPanStarted. +*/ + +/*! + \qmlsignal QtLocation::MapGestureArea::panFinished() + + This signal is emitted when the map stops moving due to user + interaction. If a flick was generated, this signal is + emitted before flick starts. If a flick was not + generated, this signal is emitted when the + user stops dragging - that is a mouse or touch release. + + The corresponding handler is \c onPanFinished. + +*/ + +/*! + \qmlsignal QtLocation::MapGestureArea::flickStarted() + + This signal is emitted when the map is flicked. A flick + starts from the point where the mouse or touch was released, + while still in motion. + + The corresponding handler is \c onFlichStarted. +*/ + +/*! + \qmlsignal QtLocation::MapGestureArea::flickFinished() + + This signal is emitted when the map stops moving due to a flick. + + The corresponding handler is \c onFlickFinished. +*/ + +QQuickGeoMapGestureArea::QQuickGeoMapGestureArea(QDeclarativeGeoMap *map) + : QQuickItem(map), + m_map(0), + m_declarativeMap(map), + m_enabled(true), + m_acceptedGestures(PinchGesture | PanGesture | FlickGesture), + m_preventStealing(false), + m_panEnabled(true) +{ + m_flick.m_enabled = true, + m_flick.m_maxVelocity = QML_MAP_FLICK_DEFAULTMAXVELOCITY; + m_flick.m_deceleration = QML_MAP_FLICK_DEFAULTDECELERATION; + m_flick.m_animation = 0; + m_touchPointState = touchPoints0; + m_pinchState = pinchInactive; + m_flickState = flickInactive; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::setMap(QGeoMap *map) +{ + if (m_map || !map) + return; + + m_map = map; + m_flick.m_animation = new QQuickGeoCoordinateAnimation(this); + m_flick.m_animation->setTargetObject(m_declarativeMap); + m_flick.m_animation->setProperty(QStringLiteral("center")); + m_flick.m_animation->setEasing(QEasingCurve(QEasingCurve::OutQuad)); + connect(m_flick.m_animation, &QQuickAbstractAnimation::stopped, this, &QQuickGeoMapGestureArea::handleFlickAnimationStopped); +} + +/*! + \qmlproperty bool QtQuick::MapGestureArea::preventStealing + This property holds whether the mouse events may be stolen from this + MapGestureArea. + + If a Map is placed within an item that filters child mouse + and touch events, such as Flickable, the mouse and touch events + may be stolen from the MapGestureArea if a gesture is recognized + by the parent item, e.g. a flick gesture. If preventStealing is + set to true, no item will steal the mouse and touch events. + + Note that setting preventStealing to true once an item has started + stealing events will have no effect until the next press event. + + By default this property is false. +*/ + +bool QQuickGeoMapGestureArea::preventStealing() const +{ + return m_preventStealing; +} + +void QQuickGeoMapGestureArea::setPreventStealing(bool prevent) +{ + if (prevent != m_preventStealing) { + m_preventStealing = prevent; + m_declarativeMap->setKeepMouseGrab(m_preventStealing && m_enabled); + m_declarativeMap->setKeepTouchGrab(m_preventStealing && m_enabled); + emit preventStealingChanged(); + } +} + +QQuickGeoMapGestureArea::~QQuickGeoMapGestureArea() +{ +} + +/*! + \qmlproperty enumeration QtLocation::MapGestureArea::acceptedGestures + + This property holds the gestures that will be active. By default + the zoom, pan and flick gestures are enabled. + + \list + \li MapGestureArea.NoGesture - Don't support any additional gestures (value: 0x0000). + \li MapGestureArea.PinchGesture - Support the map pinch gesture (value: 0x0001). + \li MapGestureArea.PanGesture - Support the map pan gesture (value: 0x0002). + \li MapGestureArea.FlickGesture - Support the map flick gesture (value: 0x0004). + \endlist +*/ + +QQuickGeoMapGestureArea::AcceptedGestures QQuickGeoMapGestureArea::acceptedGestures() const +{ + return m_acceptedGestures; +} + + +void QQuickGeoMapGestureArea::setAcceptedGestures(AcceptedGestures acceptedGestures) +{ + if (acceptedGestures == m_acceptedGestures) + return; + m_acceptedGestures = acceptedGestures; + + setPanEnabled(acceptedGestures & PanGesture); + setFlickEnabled(acceptedGestures & FlickGesture); + setPinchEnabled(acceptedGestures & PinchGesture); + + emit acceptedGesturesChanged(); +} + +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::isPinchActive() const +{ + return m_pinchState == pinchActive; +} + +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::isPanActive() const +{ + return m_flickState == panActive || m_flickState == flickActive; +} + +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::enabled() const +{ + return m_enabled; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::setEnabled(bool enabled) +{ + if (enabled == m_enabled) + return; + m_enabled = enabled; + + if (enabled) { + setPanEnabled(m_acceptedGestures & PanGesture); + setFlickEnabled(m_acceptedGestures & FlickGesture); + setPinchEnabled(m_acceptedGestures & PinchGesture); + } else { + setPanEnabled(false); + setFlickEnabled(false); + setPinchEnabled(false); + } + + emit enabledChanged(); +} + + +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::pinchEnabled() const +{ + return m_pinch.m_enabled; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::setPinchEnabled(bool enabled) +{ + if (enabled == m_pinch.m_enabled) + return; + m_pinch.m_enabled = enabled; +} + +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::panEnabled() const +{ + return m_panEnabled; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::setPanEnabled(bool enabled) +{ + if (enabled == m_flick.m_enabled) + return; + m_panEnabled = enabled; + + // unlike the pinch, the pan existing functionality is to stop immediately + if (!enabled) + stopPan(); +} + +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::flickEnabled() const +{ + return m_flick.m_enabled; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::setFlickEnabled(bool enabled) +{ + if (enabled == m_flick.m_enabled) + return; + m_flick.m_enabled = enabled; + // unlike the pinch, the flick existing functionality is to stop immediately + if (!enabled) { + stopFlick(); + } +} + +/*! + \internal + Used internally to set the minimum zoom level of the gesture area. + The caller is responsible to only send values that are valid + for the map plugin. Negative values are ignored. + */ +void QQuickGeoMapGestureArea::setMinimumZoomLevel(qreal min) +{ + if (min >= 0) + m_pinch.m_zoom.m_minimum = min; +} + +/*! + \internal + */ +qreal QQuickGeoMapGestureArea::minimumZoomLevel() const +{ + return m_pinch.m_zoom.m_minimum; +} + +/*! + \internal + Used internally to set the maximum zoom level of the gesture area. + The caller is responsible to only send values that are valid + for the map plugin. Negative values are ignored. + */ +void QQuickGeoMapGestureArea::setMaximumZoomLevel(qreal max) +{ + if (max >= 0) + m_pinch.m_zoom.m_maximum = max; +} + +/*! + \internal + */ +qreal QQuickGeoMapGestureArea::maximumZoomLevel() const +{ + return m_pinch.m_zoom.m_maximum; +} + +/*! + \internal +*/ +qreal QQuickGeoMapGestureArea::maximumZoomLevelChange() const +{ + return m_pinch.m_zoom.maximumChange; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::setMaximumZoomLevelChange(qreal maxChange) +{ + if (maxChange == m_pinch.m_zoom.maximumChange || maxChange < 0.1 || maxChange > 10.0) + return; + m_pinch.m_zoom.maximumChange = maxChange; + emit maximumZoomLevelChangeChanged(); +} + +/*! + \internal +*/ +qreal QQuickGeoMapGestureArea::flickDeceleration() const +{ + return m_flick.m_deceleration; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::setFlickDeceleration(qreal deceleration) +{ + if (deceleration < QML_MAP_FLICK_MINIMUMDECELERATION) + deceleration = QML_MAP_FLICK_MINIMUMDECELERATION; + else if (deceleration > QML_MAP_FLICK_MAXIMUMDECELERATION) + deceleration = QML_MAP_FLICK_MAXIMUMDECELERATION; + if (deceleration == m_flick.m_deceleration) + return; + m_flick.m_deceleration = deceleration; + emit flickDecelerationChanged(); +} + +/*! + \internal +*/ +QTouchEvent::TouchPoint* createTouchPointFromMouseEvent(QMouseEvent *event, Qt::TouchPointState state) +{ + // this is only partially filled. But since it is only partially used it works + // more robust would be to store a list of QPointFs rather than TouchPoints + QTouchEvent::TouchPoint* newPoint = new QTouchEvent::TouchPoint(); + newPoint->setPos(event->localPos()); + newPoint->setScenePos(event->windowPos()); + newPoint->setScreenPos(event->screenPos()); + newPoint->setState(state); + newPoint->setId(0); + return newPoint; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::handleMousePressEvent(QMouseEvent *event) +{ + m_mousePoint.reset(createTouchPointFromMouseEvent(event, Qt::TouchPointPressed)); + if (m_touchPoints.isEmpty()) update(); + event->accept(); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::handleMouseMoveEvent(QMouseEvent *event) +{ + m_mousePoint.reset(createTouchPointFromMouseEvent(event, Qt::TouchPointMoved)); + if (m_touchPoints.isEmpty()) update(); + event->accept(); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::handleMouseReleaseEvent(QMouseEvent *event) +{ + if (!m_mousePoint.isNull()) { + //this looks super ugly , however is required in case we do not get synthesized MouseReleaseEvent + //and we reset the point already in handleTouchUngrabEvent + m_mousePoint.reset(createTouchPointFromMouseEvent(event, Qt::TouchPointReleased)); + if (m_touchPoints.isEmpty()) update(); + } + event->accept(); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::handleMouseUngrabEvent() +{ + + if (m_touchPoints.isEmpty() && !m_mousePoint.isNull()) { + m_mousePoint.reset(); + update(); + } else { + m_mousePoint.reset(); + } +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::handleTouchUngrabEvent() +{ + m_touchPoints.clear(); + //this is needed since in some cases mouse release is not delivered + //(second touch point breaks mouse synthesized events) + m_mousePoint.reset(); + update(); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::handleTouchEvent(QTouchEvent *event) +{ + m_touchPoints.clear(); + m_mousePoint.reset(); + + for (int i = 0; i < event->touchPoints().count(); ++i) { + auto point = event->touchPoints().at(i); + if (point.state() != Qt::TouchPointReleased) + m_touchPoints << point; + } + if (event->touchPoints().count() >= 2) + event->accept(); + else + event->ignore(); + update(); +} + +void QQuickGeoMapGestureArea::handleWheelEvent(QWheelEvent *event) +{ + if (!m_map) + return; + + QGeoCoordinate wheelGeoPos = m_map->geoProjection().itemPositionToCoordinate(QDoubleVector2D(event->posF()), false); + QPointF preZoomPoint = m_map->geoProjection().coordinateToItemPosition(wheelGeoPos, false).toPointF(); + + double zoomLevelDelta = event->angleDelta().y() * qreal(0.001); + m_declarativeMap->setZoomLevel(m_declarativeMap->zoomLevel() + zoomLevelDelta); + QPointF postZoomPoint = m_map->geoProjection().coordinateToItemPosition(wheelGeoPos, false).toPointF(); + + if (preZoomPoint != postZoomPoint) + { + qreal dx = postZoomPoint.x() - preZoomPoint.x(); + qreal dy = postZoomPoint.y() - preZoomPoint.y(); + QPointF mapCenterPoint(m_map->viewportWidth() / 2.0 + dx, m_map->viewportHeight() / 2.0 + dy); + + QGeoCoordinate mapCenterCoordinate = m_map->geoProjection().itemPositionToCoordinate(QDoubleVector2D(mapCenterPoint), false); + m_declarativeMap->setCenter(mapCenterCoordinate); + } + event->accept(); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::clearTouchData() +{ + m_velocityX = 0; + m_velocityY = 0; + m_sceneCenter.setX(0); + m_sceneCenter.setY(0); + m_touchCenterCoord.setLongitude(0); + m_touchCenterCoord.setLatitude(0); + m_startCoord.setLongitude(0); + m_startCoord.setLatitude(0); +} + + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::updateVelocityList(const QPointF &pos) +{ + // Take velocity samples every sufficient period of time, used later to determine the flick + // duration and speed (when mouse is released). + qreal elapsed = qreal(m_lastPosTime.elapsed()); + + if (elapsed >= QML_MAP_FLICK_VELOCITY_SAMPLE_PERIOD) { + elapsed /= 1000.; + int dyFromLastPos = pos.y() - m_lastPos.y(); + int dxFromLastPos = pos.x() - m_lastPos.x(); + m_lastPos = pos; + m_lastPosTime.restart(); + qreal velX = qreal(dxFromLastPos) / elapsed; + qreal velY = qreal(dyFromLastPos) / elapsed; + m_velocityX = qBound<qreal>(-m_flick.m_maxVelocity, velX, m_flick.m_maxVelocity); + m_velocityY = qBound<qreal>(-m_flick.m_maxVelocity, velY, m_flick.m_maxVelocity); + } +} + +/*! + \internal +*/ + +bool QQuickGeoMapGestureArea::isActive() const +{ + return isPanActive() || isPinchActive(); +} + +/*! + \internal +*/ +// simplify the gestures by using a state-machine format (easy to move to a future state machine) +void QQuickGeoMapGestureArea::update() +{ + if (!m_map) + return; + + // First state machine is for the number of touch points + + //combine touch with mouse event + m_allPoints.clear(); + m_allPoints << m_touchPoints; + if (m_allPoints.isEmpty() && !m_mousePoint.isNull()) + m_allPoints << *m_mousePoint.data(); + + touchPointStateMachine(); + + // Parallel state machine for pinch + if (isPinchActive() || (m_enabled && m_pinch.m_enabled && (m_acceptedGestures & (PinchGesture)))) + pinchStateMachine(); + + // Parallel state machine for pan (since you can pan at the same time as pinching) + // The stopPan function ensures that pan stops immediately when disabled, + // but the line below allows pan continue its current gesture if you disable + // the whole gesture (enabled_ flag), this keeps the enabled_ consistent with the pinch + if (isPanActive() || (m_enabled && m_flick.m_enabled && (m_acceptedGestures & (PanGesture | FlickGesture)))) + panStateMachine(); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::touchPointStateMachine() +{ + // Transitions: + switch (m_touchPointState) { + case touchPoints0: + if (m_allPoints.count() == 1) { + clearTouchData(); + startOneTouchPoint(); + m_touchPointState = touchPoints1; + } else if (m_allPoints.count() >= 2) { + clearTouchData(); + startTwoTouchPoints(); + m_touchPointState = touchPoints2; + } + break; + case touchPoints1: + if (m_allPoints.count() == 0) { + m_touchPointState = touchPoints0; + } else if (m_allPoints.count() == 2) { + m_touchCenterCoord = m_map->geoProjection().itemPositionToCoordinate(QDoubleVector2D(m_sceneCenter), false); + startTwoTouchPoints(); + m_touchPointState = touchPoints2; + } + break; + case touchPoints2: + if (m_allPoints.count() == 0) { + m_touchPointState = touchPoints0; + } else if (m_allPoints.count() == 1) { + m_touchCenterCoord = m_map->geoProjection().itemPositionToCoordinate(QDoubleVector2D(m_sceneCenter), false); + startOneTouchPoint(); + m_touchPointState = touchPoints1; + } + break; + }; + + // Update + switch (m_touchPointState) { + case touchPoints0: + break; // do nothing if no touch points down + case touchPoints1: + updateOneTouchPoint(); + break; + case touchPoints2: + updateTwoTouchPoints(); + break; + } +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::startOneTouchPoint() +{ + m_sceneStartPoint1 = mapFromScene(m_allPoints.at(0).scenePos()); + m_lastPos = m_sceneStartPoint1; + m_lastPosTime.start(); + QGeoCoordinate startCoord = m_map->geoProjection().itemPositionToCoordinate(QDoubleVector2D(m_sceneStartPoint1), false); + // ensures a smooth transition for panning + m_startCoord.setLongitude(m_startCoord.longitude() + startCoord.longitude() - + m_touchCenterCoord.longitude()); + m_startCoord.setLatitude(m_startCoord.latitude() + startCoord.latitude() - + m_touchCenterCoord.latitude()); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::updateOneTouchPoint() +{ + m_sceneCenter = mapFromScene(m_allPoints.at(0).scenePos()); + updateVelocityList(m_sceneCenter); +} + + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::startTwoTouchPoints() +{ + m_sceneStartPoint1 = mapFromScene(m_allPoints.at(0).scenePos()); + m_sceneStartPoint2 = mapFromScene(m_allPoints.at(1).scenePos()); + QPointF startPos = (m_sceneStartPoint1 + m_sceneStartPoint2) * 0.5; + m_lastPos = startPos; + m_lastPosTime.start(); + QGeoCoordinate startCoord = m_map->geoProjection().itemPositionToCoordinate(QDoubleVector2D(startPos), false); + m_startCoord.setLongitude(m_startCoord.longitude() + startCoord.longitude() - + m_touchCenterCoord.longitude()); + m_startCoord.setLatitude(m_startCoord.latitude() + startCoord.latitude() - + m_touchCenterCoord.latitude()); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::updateTwoTouchPoints() +{ + QPointF p1 = mapFromScene(m_allPoints.at(0).scenePos()); + QPointF p2 = mapFromScene(m_allPoints.at(1).scenePos()); + qreal dx = p1.x() - p2.x(); + qreal dy = p1.y() - p2.y(); + m_distanceBetweenTouchPoints = sqrt(dx * dx + dy * dy); + m_sceneCenter = (p1 + p2) / 2; + updateVelocityList(m_sceneCenter); + + m_twoTouchAngle = QLineF(p1, p2).angle(); + if (m_twoTouchAngle > 180) + m_twoTouchAngle -= 360; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::pinchStateMachine() +{ + PinchState lastState = m_pinchState; + // Transitions: + switch (m_pinchState) { + case pinchInactive: + if (m_allPoints.count() >= 2) { + if (canStartPinch()) { + m_declarativeMap->setKeepMouseGrab(true); + m_declarativeMap->setKeepTouchGrab(true); + startPinch(); + m_pinchState = pinchActive; + } else { + m_pinchState = pinchInactiveTwoPoints; + } + } + break; + case pinchInactiveTwoPoints: + if (m_allPoints.count() <= 1) { + m_pinchState = pinchInactive; + } else { + if (canStartPinch()) { + m_declarativeMap->setKeepMouseGrab(true); + m_declarativeMap->setKeepTouchGrab(true); + startPinch(); + m_pinchState = pinchActive; + } + } + break; + case pinchActive: + if (m_allPoints.count() <= 1) { + m_pinchState = pinchInactive; + m_declarativeMap->setKeepMouseGrab(m_preventStealing); + m_declarativeMap->setKeepTouchGrab(m_preventStealing); + endPinch(); + } + break; + } + // This line implements an exclusive state machine, where the transitions and updates don't + // happen on the same frame + if (m_pinchState != lastState) { + emit pinchActiveChanged(); + return; + } + + // Update + switch (m_pinchState) { + case pinchInactive: + case pinchInactiveTwoPoints: + break; // do nothing + case pinchActive: + updatePinch(); + break; + } +} + +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::canStartPinch() +{ + const int startDragDistance = qApp->styleHints()->startDragDistance(); + + if (m_allPoints.count() >= 2) { + QPointF p1 = mapFromScene(m_allPoints.at(0).scenePos()); + QPointF p2 = mapFromScene(m_allPoints.at(1).scenePos()); + if (qAbs(p1.x()-m_sceneStartPoint1.x()) > startDragDistance + || qAbs(p1.y()-m_sceneStartPoint1.y()) > startDragDistance + || qAbs(p2.x()-m_sceneStartPoint2.x()) > startDragDistance + || qAbs(p2.y()-m_sceneStartPoint2.y()) > startDragDistance) { + m_pinch.m_event.setCenter(mapFromScene(m_sceneCenter)); + m_pinch.m_event.setAngle(m_twoTouchAngle); + m_pinch.m_event.setPoint1(p1); + m_pinch.m_event.setPoint2(p2); + m_pinch.m_event.setPointCount(m_allPoints.count()); + m_pinch.m_event.setAccepted(true); + emit pinchStarted(&m_pinch.m_event); + return m_pinch.m_event.accepted(); + } + } + return false; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::startPinch() +{ + m_pinch.m_startDist = m_distanceBetweenTouchPoints; + m_pinch.m_zoom.m_previous = m_declarativeMap->zoomLevel(); + m_pinch.m_lastAngle = m_twoTouchAngle; + + m_pinch.m_lastPoint1 = mapFromScene(m_allPoints.at(0).scenePos()); + m_pinch.m_lastPoint2 = mapFromScene(m_allPoints.at(1).scenePos()); + + m_pinch.m_zoom.m_start = m_declarativeMap->zoomLevel(); +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::updatePinch() +{ + // Calculate the new zoom level if we have distance ( >= 2 touchpoints), otherwise stick with old. + qreal newZoomLevel = m_pinch.m_zoom.m_previous; + if (m_distanceBetweenTouchPoints) { + newZoomLevel = + // How much further/closer the current touchpoints are (in pixels) compared to pinch start + ((m_distanceBetweenTouchPoints - m_pinch.m_startDist) * + // How much one pixel corresponds in units of zoomlevel (and multiply by above delta) + (m_pinch.m_zoom.maximumChange / ((width() + height()) / 2))) + + // Add to starting zoom level. Sign of (dist-pinchstartdist) takes care of zoom in / out + m_pinch.m_zoom.m_start; + } + + m_pinch.m_event.setCenter(mapFromScene(m_sceneCenter)); + m_pinch.m_event.setAngle(m_twoTouchAngle); + + m_pinch.m_lastPoint1 = mapFromScene(m_allPoints.at(0).scenePos()); + m_pinch.m_lastPoint2 = mapFromScene(m_allPoints.at(1).scenePos()); + m_pinch.m_event.setPoint1(m_pinch.m_lastPoint1); + m_pinch.m_event.setPoint2(m_pinch.m_lastPoint2); + m_pinch.m_event.setPointCount(m_allPoints.count()); + m_pinch.m_event.setAccepted(true); + + m_pinch.m_lastAngle = m_twoTouchAngle; + emit pinchUpdated(&m_pinch.m_event); + + if (m_acceptedGestures & PinchGesture) { + // Take maximum and minimumzoomlevel into account + qreal perPinchMinimumZoomLevel = qMax(m_pinch.m_zoom.m_start - m_pinch.m_zoom.maximumChange, m_pinch.m_zoom.m_minimum); + qreal perPinchMaximumZoomLevel = qMin(m_pinch.m_zoom.m_start + m_pinch.m_zoom.maximumChange, m_pinch.m_zoom.m_maximum); + newZoomLevel = qMin(qMax(perPinchMinimumZoomLevel, newZoomLevel), perPinchMaximumZoomLevel); + m_declarativeMap->setZoomLevel(newZoomLevel); + m_pinch.m_zoom.m_previous = newZoomLevel; + } +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::endPinch() +{ + QPointF p1 = mapFromScene(m_pinch.m_lastPoint1); + QPointF p2 = mapFromScene(m_pinch.m_lastPoint2); + m_pinch.m_event.setCenter((p1 + p2) / 2); + m_pinch.m_event.setAngle(m_pinch.m_lastAngle); + m_pinch.m_event.setPoint1(p1); + m_pinch.m_event.setPoint2(p2); + m_pinch.m_event.setAccepted(true); + m_pinch.m_event.setPointCount(0); + emit pinchFinished(&m_pinch.m_event); + m_pinch.m_startDist = 0; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::panStateMachine() +{ + FlickState lastState = m_flickState; + + // Transitions + switch (m_flickState) { + case flickInactive: + if (canStartPan()) { + // Update startCoord_ to ensure smooth start for panning when going over startDragDistance + QGeoCoordinate newStartCoord = m_map->geoProjection().itemPositionToCoordinate(QDoubleVector2D(m_sceneCenter), false); + m_startCoord.setLongitude(newStartCoord.longitude()); + m_startCoord.setLatitude(newStartCoord.latitude()); + m_declarativeMap->setKeepMouseGrab(true); + m_flickState = panActive; + } + break; + case panActive: + if (m_allPoints.count() == 0) { + if (!tryStartFlick()) + { + m_flickState = flickInactive; + // mark as inactive for use by camera + if (m_pinchState == pinchInactive) { + m_declarativeMap->setKeepMouseGrab(m_preventStealing); + m_map->prefetchData(); + } + emit panFinished(); + } else { + m_flickState = flickActive; + emit panFinished(); + emit flickStarted(); + } + } + break; + case flickActive: + if (m_allPoints.count() > 0) { // re touched before movement ended + stopFlick(); + m_declarativeMap->setKeepMouseGrab(true); + m_flickState = panActive; + } + break; + } + + if (m_flickState != lastState) + emit panActiveChanged(); + + // Update + switch (m_flickState) { + case flickInactive: // do nothing + break; + case panActive: + updatePan(); + // this ensures 'panStarted' occurs after the pan has actually started + if (lastState != panActive) + emit panStarted(); + break; + case flickActive: + break; + } +} +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::canStartPan() +{ + if (m_allPoints.count() == 0 || (m_acceptedGestures & PanGesture) == 0) + return false; + + // Check if thresholds for normal panning are met. + // (normal panning vs flicking: flicking will start from mouse release event). + const int startDragDistance = qApp->styleHints()->startDragDistance() * 2; + QPointF p1 = mapFromScene(m_allPoints.at(0).scenePos()); + int dyFromPress = int(p1.y() - m_sceneStartPoint1.y()); + int dxFromPress = int(p1.x() - m_sceneStartPoint1.x()); + if ((qAbs(dyFromPress) >= startDragDistance || qAbs(dxFromPress) >= startDragDistance)) + return true; + return false; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::updatePan() +{ + QPointF startPoint = m_map->geoProjection().coordinateToItemPosition(m_startCoord, false).toPointF(); + int dx = static_cast<int>(m_sceneCenter.x() - startPoint.x()); + int dy = static_cast<int>(m_sceneCenter.y() - startPoint.y()); + QPointF mapCenterPoint; + mapCenterPoint.setY(m_map->viewportHeight() / 2.0 - dy); + mapCenterPoint.setX(m_map->viewportWidth() / 2.0 - dx); + QGeoCoordinate animationStartCoordinate = m_map->geoProjection().itemPositionToCoordinate(QDoubleVector2D(mapCenterPoint), false); + m_declarativeMap->setCenter(animationStartCoordinate); +} + +/*! + \internal +*/ +bool QQuickGeoMapGestureArea::tryStartFlick() +{ + if ((m_acceptedGestures & FlickGesture) == 0) + return false; + // if we drag then pause before release we should not cause a flick. + qreal velocityX = 0.0; + qreal velocityY = 0.0; + if (m_lastPosTime.elapsed() < QML_MAP_FLICK_VELOCITY_SAMPLE_PERIOD) { + velocityY = m_velocityY; + velocityX = m_velocityX; + } + int flickTimeY = 0; + int flickTimeX = 0; + int flickPixelsX = 0; + int flickPixelsY = 0; + if (qAbs(velocityY) > MinimumFlickVelocity && qAbs(m_sceneCenter.y() - m_sceneStartPoint1.y()) > FlickThreshold) { + // calculate Y flick animation values + qreal acceleration = m_flick.m_deceleration; + if ((velocityY > 0.0f) == (m_flick.m_deceleration > 0.0f)) + acceleration = acceleration * -1.0f; + flickTimeY = static_cast<int>(-1000 * velocityY / acceleration); + flickPixelsY = (flickTimeY * velocityY) / (1000.0 * 2); + } + if (qAbs(velocityX) > MinimumFlickVelocity && qAbs(m_sceneCenter.x() - m_sceneStartPoint1.x()) > FlickThreshold) { + // calculate X flick animation values + qreal acceleration = m_flick.m_deceleration; + if ((velocityX > 0.0f) == (m_flick.m_deceleration > 0.0f)) + acceleration = acceleration * -1.0f; + flickTimeX = static_cast<int>(-1000 * velocityX / acceleration); + flickPixelsX = (flickTimeX * velocityX) / (1000.0 * 2); + } + int flickTime = qMax(flickTimeY, flickTimeX); + if (flickTime > 0) { + startFlick(flickPixelsX, flickPixelsY, flickTime); + return true; + } + return false; +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::startFlick(int dx, int dy, int timeMs) +{ + if (!m_flick.m_animation) + return; + if (timeMs < 0) + return; + + QGeoCoordinate animationStartCoordinate = m_declarativeMap->center(); + + if (m_flick.m_animation->isRunning()) + m_flick.m_animation->stop(); + QGeoCoordinate animationEndCoordinate = m_declarativeMap->center(); + m_flick.m_animation->setDuration(timeMs); + + double zoom = pow(2.0, m_declarativeMap->zoomLevel()); + double longitude = animationStartCoordinate.longitude() - (dx / zoom); + double latitude = animationStartCoordinate.latitude() + (dy / zoom); + + if (dx > 0) + m_flick.m_animation->setDirection(QQuickGeoCoordinateAnimation::East); + else + m_flick.m_animation->setDirection(QQuickGeoCoordinateAnimation::West); + + //keep animation in correct bounds + if (latitude > 85.05113) + latitude = 85.05113; + else if (latitude < -85.05113) + latitude = -85.05113; + + if (longitude > 180) + longitude = longitude - 360; + else if (longitude < -180) + longitude = longitude + 360; + + animationEndCoordinate.setLongitude(longitude); + animationEndCoordinate.setLatitude(latitude); + + m_flick.m_animation->setFrom(animationStartCoordinate); + m_flick.m_animation->setTo(animationEndCoordinate); + m_flick.m_animation->start(); +} + +void QQuickGeoMapGestureArea::stopPan() +{ + if (m_flickState == flickActive) { + stopFlick(); + } else if (m_flickState == panActive) { + m_velocityX = 0; + m_velocityY = 0; + m_flickState = flickInactive; + m_declarativeMap->setKeepMouseGrab(m_preventStealing); + emit panFinished(); + emit panActiveChanged(); + m_map->prefetchData(); + } +} + +/*! + \internal +*/ +void QQuickGeoMapGestureArea::stopFlick() +{ + if (!m_flick.m_animation) + return; + m_velocityX = 0; + m_velocityY = 0; + if (m_flick.m_animation->isRunning()) + m_flick.m_animation->stop(); + else + handleFlickAnimationStopped(); +} + +void QQuickGeoMapGestureArea::handleFlickAnimationStopped() +{ + m_declarativeMap->setKeepMouseGrab(m_preventStealing); + if (m_flickState == flickActive) { + m_flickState = flickInactive; + emit flickFinished(); + emit panActiveChanged(); + m_map->prefetchData(); + } +} + +#include "moc_qquickgeomapgesturearea_p.cpp" + +QT_END_NAMESPACE |