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monir. typo
monir. typo
Michal Klocek - - Load All Authors

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scroller.cpp
251 lines | 5.9 KiB | text/x-c | CppLexer
/ src / scroller.cpp
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Michal Klocek
Refactor qledgend handling...
 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>
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Improves build configuration...
 r996 #include <QDebug>
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 r855
QTCOMMERCIALCHART_BEGIN_NAMESPACE
Michal Klocek
Adds ScrolledQLegend...
 r859 Scroller::Scroller():
Michal Klocek
Refactor qledgend handling...
 r855 m_ticker(this),
m_state(Idle),
m_moveThreshold(10),
Michal Klocek
Adds ScrolledQLegend...
 r859 m_timeTreshold(50)
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Refactor qledgend handling...
 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 {
Michal Klocek
minor. Release polishing
 r1049 m_speed /= 3.75;
Michal Klocek
Refactor qledgend handling...
 r855 m_state = Scroll;
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minor. Release polishing
 r1049 m_ticker.start(25);
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Refactor qledgend handling...
 r855 }
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();
}
Michal Klocek
Krazy reported errors...
 r974 #include "moc_scroller_p.cpp"
Michal Klocek
Refactor qledgend handling...
 r855 QTCOMMERCIALCHART_END_NAMESPACE