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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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#include <private/scroller_p.h>
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#include <QtCharts/QLegend>
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#include <QtWidgets/QGraphicsSceneMouseEvent>
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#include <QtCore/QDebug>
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QT_CHARTS_BEGIN_NAMESPACE
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Scroller::Scroller()
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: m_ticker(this),
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m_timeTresholdMin(50),
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m_timeTresholdMax(300),
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m_state(Idle),
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m_treshold(10)
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{
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}
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Scroller::~Scroller()
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{
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}
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void Scroller::move(const QPointF &delta)
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{
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switch (m_state) {
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case Pressed:
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m_timeStamp = QTime::currentTime();
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break;
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case Scroll:
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stopTicker();
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m_timeStamp = QTime::currentTime();
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break;
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default:
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break;
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}
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setOffset(offset() - delta);
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}
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void Scroller::scrollTo(const QPointF &delta)
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{
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// Starts scrolling, if at least m_timeTresholdMin msecs has gone since timestamp
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// current time is no more than m_timeTresholdMax from timestamp
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if ((m_timeStamp.elapsed() > m_timeTresholdMin) && (m_timeStamp.msecsTo(QTime::currentTime()) < m_timeTresholdMax)) {
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// Release was quick enough. Start scrolling.
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qreal interval = 25;
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qreal time = m_timeStamp.msecsTo(QTime::currentTime());
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if (qFuzzyCompare(time, 0)) {
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m_speed = delta / 5;
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} else {
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m_speed = delta * interval / time;
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}
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qreal fraction = qMax(qAbs(m_speed.x()), qAbs(m_speed.y()));
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if (!qFuzzyCompare(fraction, 0)) {
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m_fraction.setX(qAbs(m_speed.x() / fraction));
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m_fraction.setY(qAbs(m_speed.y() / fraction));
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} else {
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m_fraction.setX(1);
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m_fraction.setY(1);
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}
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startTicker(interval);
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} else {
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stopTicker(); // Stop ticker, if one is running.
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}
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}
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void Scroller::handleMousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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stopTicker();
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m_pressPos = event->screenPos();
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m_lastPos = m_pressPos;
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m_state = Pressed;
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event->accept();
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}
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void Scroller::handleMouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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QPointF delta = event->screenPos() - m_lastPos;
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switch (m_state) {
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case Pressed: {
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// calculate treshold. If enough, change to move state and send out move deltas.
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if (qAbs(delta.x()) > m_treshold || qAbs(delta.y()) > m_treshold) {
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m_lastPos = event->screenPos();
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move(delta);
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m_state = Move;
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}
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event->accept();
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break;
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}
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case Move: {
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m_lastPos = event->screenPos();
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move(delta);
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event->accept();
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break;
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}
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case Idle:
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default: {
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event->ignore();
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break;
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}
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}
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}
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void Scroller::handleMouseReleaseEvent(QGraphicsSceneMouseEvent *event)
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{
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switch (m_state) {
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case Move:
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{
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scrollTo(m_lastPos - m_pressPos);
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event->accept();
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break;
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}
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default:
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{
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m_state = Idle;
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event->ignore();
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break;
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}
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}
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}
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void Scroller::startTicker(int interval)
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{
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m_state = Scroll;
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m_ticker.start(interval);
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}
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void Scroller::stopTicker()
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{
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m_state = Idle;
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m_ticker.stop();
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}
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void Scroller::scrollTick()
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{
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switch (m_state) {
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case Scroll:
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lowerSpeed(m_speed);
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setOffset(offset() - m_speed);
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if (m_speed == QPointF(0, 0)) {
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m_state = Idle;
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m_ticker.stop();
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}
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break;
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default:
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qWarning() << __FUNCTION__ << "Scroller unexpected state" << m_state;
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m_ticker.stop();
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m_state = Idle;
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break;
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}
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}
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void Scroller::lowerSpeed(QPointF &speed, qreal maxSpeed)
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{
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qreal x = qBound(-maxSpeed, speed.x(), maxSpeed);
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qreal y = qBound(-maxSpeed, speed.y(), maxSpeed);
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x = (x == 0) ? x :
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(x > 0) ? qMax(qreal(0), x - m_fraction.x()) : qMin(qreal(0), x + m_fraction.x());
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y = (y == 0) ? y :
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(y > 0) ? qMax(qreal(0), y - m_fraction.y()) : qMin(qreal(0), y + m_fraction.y());
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speed.setX(x);
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speed.setY(y);
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}
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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ScrollTicker::ScrollTicker(Scroller *scroller, QObject *parent)
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: QObject(parent),
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m_scroller(scroller)
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{
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}
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void ScrollTicker::start(int interval)
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{
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if (!m_timer.isActive())
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m_timer.start(interval, this);
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}
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void ScrollTicker::stop()
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{
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m_timer.stop();
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}
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void ScrollTicker::timerEvent(QTimerEvent *event)
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{
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Q_UNUSED(event);
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m_scroller->scrollTick();
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}
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#include "moc_scroller_p.cpp"
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QT_CHARTS_END_NAMESPACE
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