scroller.cpp
216 lines
| 5.1 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> | ||||
|
Michal Klocek
|
r996 | #include <QDebug> | ||
|
Michal Klocek
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r855 | |||
| QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||||
Jani Honkonen
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r2097 | Scroller::Scroller() | ||
| : m_ticker(this), | ||||
sauimone
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r2189 | m_timeTresholdMin(50), | ||
| m_timeTresholdMax(300), | ||||
|
sauimone
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r2199 | m_state(Idle), | ||
| m_treshold(10) | ||||
|
Michal Klocek
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r855 | { | ||
| } | ||||
| Scroller::~Scroller() | ||||
| { | ||||
| } | ||||
|
sauimone
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r2189 | void Scroller::move(const QPointF &delta) | ||
|
Michal Klocek
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r855 | { | ||
| switch (m_state) { | ||||
|
sauimone
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r2199 | case Pressed: | ||
|
sauimone
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r2189 | m_timeStamp = QTime::currentTime(); | ||
| break; | ||||
|
Michal Klocek
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r855 | case Scroll: | ||
|
sauimone
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r2189 | stopTicker(); | ||
| m_timeStamp = QTime::currentTime(); | ||||
| break; | ||||
| default: | ||||
|
Michal Klocek
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r855 | break; | ||
| } | ||||
|
sauimone
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r2189 | setOffset(offset() - delta); | ||
|
Michal Klocek
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r855 | } | ||
|
sauimone
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r2197 | void Scroller::scrollTo(const QPointF &delta) | ||
|
Michal Klocek
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r855 | { | ||
|
sauimone
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r2189 | // Starts scrolling, if at least m_timeTresholdMin msecs has gone since timestamp | ||
| // current time is no more than m_timeTresholdMax from timestamp | ||||
|
Michal Klocek
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r855 | |||
|
sauimone
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r2189 | if ((m_timeStamp.elapsed() > m_timeTresholdMin) && (m_timeStamp.msecsTo(QTime::currentTime()) < m_timeTresholdMax)) { | ||
| // Release was quick enough. Start scrolling. | ||||
|
sauimone
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r2190 | qreal interval = 25; | ||
| qreal time = m_timeStamp.msecsTo(QTime::currentTime()); | ||||
|
sauimone
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r2191 | if (qFuzzyIsNull(time)) { | ||
|
sauimone
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r2190 | m_speed = delta / 5; | ||
|
sauimone
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r2191 | } else { | ||
|
sauimone
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r2190 | m_speed = delta * interval / time; | ||
|
sauimone
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r2191 | } | ||
|
Michal Klocek
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r855 | |||
|
sauimone
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r2189 | qreal fraction = qMax(qAbs(m_speed.x()), qAbs(m_speed.y())); | ||
| if (!qFuzzyIsNull(fraction)) { | ||||
| 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); | ||||
|
Michal Klocek
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r855 | } | ||
|
sauimone
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r2190 | startTicker(interval); | ||
|
sauimone
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r2189 | } else { | ||
| stopTicker(); // Stop ticker, if one is running. | ||||
|
Michal Klocek
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r855 | } | ||
| } | ||||
|
sauimone
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r2199 | void Scroller::handleMousePressEvent(QGraphicsSceneMouseEvent *event) | ||
| { | ||||
| stopTicker(); | ||||
| m_pressPos = event->screenPos(); | ||||
| m_lastPos = m_pressPos; | ||||
| m_state = Pressed; | ||||
| event->accept(); | ||||
| } | ||||
| void Scroller::handleMouseMoveEvent(QGraphicsSceneMouseEvent *event) | ||||
| { | ||||
| QPointF delta = event->screenPos() - m_lastPos; | ||||
| switch (m_state) { | ||||
| case Pressed: { | ||||
| // calculate treshold. If enough, change to move state and send out move deltas. | ||||
| if (qAbs(delta.x()) > m_treshold || qAbs(delta.y()) > m_treshold) { | ||||
| m_lastPos = event->screenPos(); | ||||
| move(delta); | ||||
| m_state = Move; | ||||
| } | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| case Move: { | ||||
| m_lastPos = event->screenPos(); | ||||
| move(delta); | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| case Idle: | ||||
| default: { | ||||
| event->ignore(); | ||||
| break; | ||||
| } | ||||
| } | ||||
| } | ||||
| void Scroller::handleMouseReleaseEvent(QGraphicsSceneMouseEvent *event) | ||||
| { | ||||
| switch (m_state) { | ||||
| case Move: | ||||
| { | ||||
| scrollTo(m_lastPos - m_pressPos); | ||||
| event->accept(); | ||||
| break; | ||||
| } | ||||
| default: | ||||
| { | ||||
| m_state = Idle; | ||||
| event->ignore(); | ||||
| break; | ||||
| } | ||||
| } | ||||
| } | ||||
|
sauimone
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r2189 | void Scroller::startTicker(int interval) | ||
|
sauimone
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r2183 | { | ||
|
sauimone
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r2189 | m_state = Scroll; | ||
| m_ticker.start(interval); | ||||
|
sauimone
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r2183 | } | ||
|
sauimone
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r2189 | void Scroller::stopTicker() | ||
| { | ||||
| m_state = Idle; | ||||
| m_ticker.stop(); | ||||
| } | ||||
|
sauimone
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r2183 | |||
|
Michal Klocek
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r855 | void Scroller::scrollTick() | ||
| { | ||||
| switch (m_state) { | ||||
|
Jani Honkonen
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r2097 | case Scroll: | ||
| lowerSpeed(m_speed); | ||||
|
sauimone
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r2189 | setOffset(offset() - m_speed); | ||
|
Jani Honkonen
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r2097 | if (m_speed == QPointF(0, 0)) { | ||
| m_state = Idle; | ||||
|
Michal Klocek
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r855 | m_ticker.stop(); | ||
|
Jani Honkonen
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r2097 | } | ||
| break; | ||||
|
sauimone
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r2199 | default: | ||
|
Jani Honkonen
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r2097 | qWarning() << __FUNCTION__ << "Scroller unexpected state" << m_state; | ||
| m_ticker.stop(); | ||||
|
sauimone
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r2189 | m_state = Idle; | ||
|
Michal Klocek
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r855 | break; | ||
| } | ||||
| } | ||||
|
Jani Honkonen
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r2104 | void Scroller::lowerSpeed(QPointF &speed, qreal maxSpeed) | ||
|
Michal Klocek
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r855 | { | ||
| 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); | ||||
| } | ||||
| ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// | ||||
|
Jani Honkonen
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r2104 | ScrollTicker::ScrollTicker(Scroller *scroller, QObject *parent) | ||
|
Jani Honkonen
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r2097 | : QObject(parent), | ||
| m_scroller(scroller) | ||||
|
Michal Klocek
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r855 | { | ||
| } | ||||
| void ScrollTicker::start(int interval) | ||||
| { | ||||
|
Jani Honkonen
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r2097 | if (!m_timer.isActive()) | ||
|
Michal Klocek
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r855 | m_timer.start(interval, this); | ||
| } | ||||
| void ScrollTicker::stop() | ||||
| { | ||||
| m_timer.stop(); | ||||
| } | ||||
| void ScrollTicker::timerEvent(QTimerEvent *event) | ||||
| { | ||||
| Q_UNUSED(event); | ||||
| m_scroller->scrollTick(); | ||||
| } | ||||
|
Michal Klocek
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r974 | #include "moc_scroller_p.cpp" | ||
|
Michal Klocek
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r855 | QTCOMMERCIALCHART_END_NAMESPACE | ||