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/****************************************************************************
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**
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** Copyright (C) 2012 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.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written 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.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "scroller_p.h"
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#include "qlegend.h"
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#include <QGraphicsSceneMouseEvent>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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Scroller::Scroller():
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m_ticker(this),
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m_state(Idle),
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m_moveThreshold(10),
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m_timeTreshold(50)
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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::mousePressEvent(QGraphicsSceneMouseEvent* event)
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{
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if (event->button() == Qt::LeftButton) {
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switch (m_state) {
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case Idle:
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{
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m_state = Pressed;
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m_offset = offset();
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m_press = event->pos();
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m_timeStamp = QTime::currentTime();
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event->accept();
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break;
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}
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case Scroll:
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{
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m_state = Stop;
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m_speed = QPoint(0, 0);
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m_offset = offset();
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m_press = event->pos();
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event->accept();
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break;
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}
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case Pressed:
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case Move:
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case Stop:
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qWarning() << __FUNCTION__<<"Scroller unexpected state" << m_state;
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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::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
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{
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QPointF delta = event->pos() - m_press;
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switch (m_state) {
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case Pressed:
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case Stop:
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{
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if (qAbs(delta.x()) > m_moveThreshold || qAbs(delta.y()) > m_moveThreshold) {
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m_state = Move;
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m_timeStamp = QTime::currentTime();
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m_distance = QPointF(0, 0);
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m_press = event->pos();
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event->accept();
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break;
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}
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else {
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event->ignore();
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break;
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}
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}
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case Move:
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{
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setOffset(m_offset - delta);
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calculateSpeed(event->pos());
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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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case Scroll:
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qWarning() << __FUNCTION__<<"Scroller unexpected state" << m_state;
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event->ignore();
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break;
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}
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}
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void Scroller::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
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{
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if (event->button() == Qt::LeftButton) {
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switch (m_state) {
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case Scroll:
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m_state = Stop;
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m_speed = QPointF(0, 0);
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m_offset = offset();
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event->accept();
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break;
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case Pressed:
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{
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m_state = Idle;
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//if (m_timeStamp.elapsed() < m_clickedPressDelay) {
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//emit clicked(m_offset.toPoint());
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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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{
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calculateSpeed(event->pos());
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m_offset = offset();
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m_press = event->pos();
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if (m_speed == QPointF(0, 0)) {
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m_state = Idle;
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}
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else {
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m_speed /= 4;
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m_state = Scroll;
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m_ticker.start(20);
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}
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event->accept();
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break;
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}
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case Stop:
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case Idle:
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qWarning() << __FUNCTION__<<"Scroller unexpected state" << m_state;
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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::scrollTick()
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{
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switch (m_state) {
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case Scroll:
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{
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lowerSpeed(m_speed);
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setOffset(m_offset - m_speed);
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m_offset = offset();
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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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}
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case Stop:
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m_ticker.stop();
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break;
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case Idle:
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case Move:
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case Pressed:
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qWarning() << __FUNCTION__<<"Scroller unexpected state" << m_state;
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m_ticker.stop();
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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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void Scroller::calculateSpeed(const QPointF& position)
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{
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if (m_timeStamp.elapsed() > m_timeTreshold) {
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QPointF distance = position - m_press;
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m_timeStamp = QTime::currentTime();
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m_speed = distance - m_distance;
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m_distance = distance;
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qreal fraction = qMax(qAbs(m_speed.x()), qAbs(m_speed.y()));
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if (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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}
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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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}
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}
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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ScrollTicker::ScrollTicker(Scroller *scroller,QObject* parent):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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}
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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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QTCOMMERCIALCHART_END_NAMESPACE
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