scroller.cpp
248 lines
| 5.9 KiB
| text/x-c
|
CppLexer
/ src / scroller.cpp
Michal Klocek
|
r855 | /**************************************************************************** | ||
| ** | ||||
| ** Copyright (C) 2012 Digia Plc | ||||
| ** All rights reserved. | ||||
| ** For any questions to Digia, please use contact form at http://qt.digia.com | ||||
| ** | ||||
| ** This file is part of the Qt Commercial Charts Add-on. | ||||
| ** | ||||
| ** $QT_BEGIN_LICENSE$ | ||||
| ** Licensees holding valid Qt Commercial licenses may use this file in | ||||
| ** accordance with the Qt Commercial License Agreement provided with the | ||||
| ** Software or, alternatively, in accordance with the terms contained in | ||||
| ** a written agreement between you and Digia. | ||||
| ** | ||||
| ** If you have questions regarding the use of this file, please use | ||||
| ** contact form at http://qt.digia.com | ||||
| ** $QT_END_LICENSE$ | ||||
| ** | ||||
| ****************************************************************************/ | ||||
| #include "scroller_p.h" | ||||
| #include "qlegend.h" | ||||
| #include <QGraphicsSceneMouseEvent> | ||||
| QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||||
|
Michal Klocek
|
r859 | Scroller::Scroller(): | ||
|
Michal Klocek
|
r855 | m_ticker(this), | ||
| m_state(Idle), | ||||
| m_moveThreshold(10), | ||||
|
Michal Klocek
|
r859 | m_timeTreshold(50) | ||
|
Michal Klocek
|
r855 | { | ||
| } | ||||
| Scroller::~Scroller() | ||||
| { | ||||
| } | ||||
| void Scroller::mousePressEvent(QGraphicsSceneMouseEvent* event) | ||||
| { | ||||
| if (event->button() == Qt::LeftButton) { | ||||
| switch (m_state) { | ||||
| case Idle: | ||||
| { | ||||
| m_state = Pressed; | ||||
| m_offset = offset(); | ||||
| m_press = event->pos(); | ||||
| m_timeStamp = QTime::currentTime(); | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| case Scroll: | ||||
| { | ||||
| m_state = Stop; | ||||
| m_speed = QPoint(0, 0); | ||||
| m_offset = offset(); | ||||
| m_press = event->pos(); | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| case Pressed: | ||||
| case Move: | ||||
| case Stop: | ||||
| qWarning() << __FUNCTION__<<"Scroller unexpected state" << m_state; | ||||
| event->ignore(); | ||||
| break; | ||||
| } | ||||
| } | ||||
| } | ||||
| void Scroller::mouseMoveEvent(QGraphicsSceneMouseEvent* event) | ||||
| { | ||||
| QPointF delta = event->pos() - m_press; | ||||
| switch (m_state) { | ||||
| case Pressed: | ||||
| case Stop: | ||||
| { | ||||
| if (qAbs(delta.x()) > m_moveThreshold || qAbs(delta.y()) > m_moveThreshold) { | ||||
| m_state = Move; | ||||
| m_timeStamp = QTime::currentTime(); | ||||
| m_distance = QPointF(0, 0); | ||||
| m_press = event->pos(); | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| else { | ||||
| event->ignore(); | ||||
| break; | ||||
| } | ||||
| } | ||||
| case Move: | ||||
| { | ||||
| setOffset(m_offset - delta); | ||||
| calculateSpeed(event->pos()); | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| case Idle: | ||||
| case Scroll: | ||||
| qWarning() << __FUNCTION__<<"Scroller unexpected state" << m_state; | ||||
| event->ignore(); | ||||
| break; | ||||
| } | ||||
| } | ||||
| void Scroller::mouseReleaseEvent(QGraphicsSceneMouseEvent* event) | ||||
| { | ||||
| if (event->button() == Qt::LeftButton) { | ||||
| switch (m_state) { | ||||
| case Scroll: | ||||
| m_state = Stop; | ||||
| m_speed = QPointF(0, 0); | ||||
| m_offset = offset(); | ||||
| event->accept(); | ||||
| break; | ||||
| case Pressed: | ||||
| { | ||||
| m_state = Idle; | ||||
| //if (m_timeStamp.elapsed() < m_clickedPressDelay) { | ||||
| //emit clicked(m_offset.toPoint()); | ||||
| //} | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| case Move: | ||||
| { | ||||
| calculateSpeed(event->pos()); | ||||
| m_offset = offset(); | ||||
| m_press = event->pos(); | ||||
| if (m_speed == QPointF(0, 0)) { | ||||
| m_state = Idle; | ||||
| } | ||||
| else { | ||||
| m_speed /= 4; | ||||
| m_state = Scroll; | ||||
| m_ticker.start(20); | ||||
| } | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| case Stop: | ||||
| case Idle: | ||||
| qWarning() << __FUNCTION__<<"Scroller unexpected state" << m_state; | ||||
| event->ignore(); | ||||
| break; | ||||
| } | ||||
| } | ||||
| } | ||||
| void Scroller::scrollTick() | ||||
| { | ||||
| switch (m_state) { | ||||
| case Scroll: | ||||
| { | ||||
| lowerSpeed(m_speed); | ||||
| setOffset(m_offset - m_speed); | ||||
| m_offset = offset(); | ||||
| if (m_speed == QPointF(0, 0)) { | ||||
| m_state = Idle; | ||||
| m_ticker.stop(); | ||||
| } | ||||
| break; | ||||
| } | ||||
| case Stop: | ||||
| m_ticker.stop(); | ||||
| break; | ||||
| case Idle: | ||||
| case Move: | ||||
| case Pressed: | ||||
| qWarning() << __FUNCTION__<<"Scroller unexpected state" << m_state; | ||||
| m_ticker.stop(); | ||||
| break; | ||||
| } | ||||
| } | ||||
| void Scroller::lowerSpeed(QPointF& speed, qreal maxSpeed) | ||||
| { | ||||
| qreal x = qBound(-maxSpeed, speed.x(), maxSpeed); | ||||
| qreal y = qBound(-maxSpeed, speed.y(), maxSpeed); | ||||
| x = (x == 0) ? x : | ||||
| (x > 0) ? qMax(qreal(0), x - m_fraction.x()) : qMin(qreal(0), x + m_fraction.x()); | ||||
| y = (y == 0) ? y : | ||||
| (y > 0) ? qMax(qreal(0), y - m_fraction.y()) : qMin(qreal(0), y + m_fraction.y()); | ||||
| speed.setX(x); | ||||
| speed.setY(y); | ||||
| } | ||||
| void Scroller::calculateSpeed(const QPointF& position) | ||||
| { | ||||
| if (m_timeStamp.elapsed() > m_timeTreshold) { | ||||
| QPointF distance = position - m_press; | ||||
| m_timeStamp = QTime::currentTime(); | ||||
| m_speed = distance - m_distance; | ||||
| m_distance = distance; | ||||
| qreal fraction = qMax(qAbs(m_speed.x()), qAbs(m_speed.y())); | ||||
| if (fraction != 0) { | ||||
| m_fraction.setX(qAbs(m_speed.x() / fraction)); | ||||
| m_fraction.setY(qAbs(m_speed.y() / fraction)); | ||||
| } | ||||
| else { | ||||
| m_fraction.setX(1); | ||||
| m_fraction.setY(1); | ||||
| } | ||||
| } | ||||
| } | ||||
| ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// | ||||
| ScrollTicker::ScrollTicker(Scroller *scroller,QObject* parent):QObject(parent), | ||||
| m_scroller(scroller) | ||||
| { | ||||
| } | ||||
| void ScrollTicker::start(int interval) | ||||
| { | ||||
| if (!m_timer.isActive()){ | ||||
| m_timer.start(interval, this); | ||||
| } | ||||
| } | ||||
| void ScrollTicker::stop() | ||||
| { | ||||
| m_timer.stop(); | ||||
| } | ||||
| void ScrollTicker::timerEvent(QTimerEvent *event) | ||||
| { | ||||
| Q_UNUSED(event); | ||||
| m_scroller->scrollTick(); | ||||
| } | ||||
| QTCOMMERCIALCHART_END_NAMESPACE | ||||