forked from qt-creator/qt-creator
902358b600
Change-Id: Id0b0186b66254e275cb1648e57055ab44530a64a Reviewed-by: Eike Ziller <eike.ziller@nokia.com> Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>
124 lines
3.5 KiB
C++
124 lines
3.5 KiB
C++
/*
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This file was generated by the Html5 Application wizard of Qt Creator.
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Html5ApplicationViewer is a convenience class containing mobile device specific
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code such as screen orientation handling.
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It is recommended not to modify this file, since newer versions of Qt Creator
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may offer an updated version of it.
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*/
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#include "webtouchphysics.h"
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int fastDistance(const QPoint &p, const QPoint &q)
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{
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return (p.x() - q.x()) * (p.x() - q.x()) + (p.y() - q.y()) * (p.y() - q.y());
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}
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WebTouchPhysics::WebTouchPhysics(QObject *parent)
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: WebTouchPhysicsInterface(parent)
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, m_frame(0)
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, m_inMotion(false)
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{
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connect(&m_decelerationTimer, SIGNAL(timeout()), this, SLOT(decelerationTimerFired()));
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}
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WebTouchPhysics::~WebTouchPhysics()
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{
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}
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bool WebTouchPhysics::inMotion()
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{
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return m_inMotion;
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}
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void WebTouchPhysics::stop()
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{
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m_decelerationTimer.stop();
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m_cumulativeDistance = QPoint();
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m_previousPoint = QPoint();
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m_startPressPoint = QPoint();
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m_decelerationPoints.clear();
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m_inMotion = false;
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}
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void WebTouchPhysics::start(const QPointF &pressPoint, const QWebFrame *frame)
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{
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if (!frame)
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return;
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m_frame = frame;
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m_decelerationPoints.push_front(pressPoint);
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m_decelerationTimer.setSingleShot(false);
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m_decelerationTimer.setInterval(KDecelerationTimerSpeed);
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m_previousPoint = pressPoint;
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m_startPressPoint = pressPoint.toPoint();
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}
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bool WebTouchPhysics::move(const QPointF &pressPoint)
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{
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int distance = fastDistance(pressPoint.toPoint(), m_startPressPoint);
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if (isFlick(pressPoint, distance) || isPan(pressPoint, distance)) {
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changePosition(pressPoint);
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return true;
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}
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return false;
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}
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bool WebTouchPhysics::release(const QPointF &pressPoint)
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{
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// use the cumulative distance in this case because it seems like a positive user experience
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if (m_cumulativeDistance.manhattanLength() > KCumulativeDistanceThreshold) {
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m_decelerationSpeed = (m_decelerationPoints.back() - pressPoint) / (m_decelerationPoints.count() + 1);
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m_decelerationTimer.start();
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return true;
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} else {
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m_inMotion = false;
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return false;
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}
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}
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void WebTouchPhysics::changePosition(const QPointF &point)
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{
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m_inMotion = true;
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QPointF diff = m_previousPoint - point;
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emit positionChanged(diff, m_startPressPoint);
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m_cumulativeDistance += (point - m_previousPoint);
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m_previousPoint = point;
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m_decelerationPoints.push_front(point);
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if (m_decelerationPoints.count() > KDecelerationCount)
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m_decelerationPoints.pop_back();
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}
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void WebTouchPhysics::decelerationTimerFired()
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{
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if (!m_frame) {
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m_decelerationTimer.stop();
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return;
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}
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if (qAbs(m_decelerationSpeed.x()) < KDecelerationSlowdownFactor
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&& qAbs(m_decelerationSpeed.y()) < KDecelerationSlowdownFactor) {
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m_inMotion = false;
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m_decelerationTimer.stop();
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return;
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}
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m_decelerationSpeed *= KDecelerationSlowdownFactor;
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emit positionChanged(QPoint(m_decelerationSpeed.x(), m_decelerationSpeed.y()), m_startPressPoint);
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}
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bool WebTouchPhysics::isFlick(const QPointF &pressPoint, int distance) const
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{
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Q_UNUSED(pressPoint);
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// this mouse move event is far away from the touch down position in
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// less than xx sec, the user must want to scroll quickly.
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return !m_inMotion && distance > KFlickScrollThreshold;
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}
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bool WebTouchPhysics::isPan(const QPointF &pressPoint, int distance) const
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{
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Q_UNUSED(pressPoint);
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return distance > KJitterBufferThreshold;
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}
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