1fdfc2abfe
Change-Id: I02f2c620296fcd91d4967d58767ea33fc4e1e7dc Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
285 lines
7.1 KiB
C++
285 lines
7.1 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
|
|
** All rights reserved.
|
|
** Contact: Nokia Corporation (qt-info@nokia.com)
|
|
**
|
|
** This file is part of the demonstration applications of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:LGPL$
|
|
** GNU Lesser General Public License Usage
|
|
** This file may be used under the terms of the GNU Lesser General Public
|
|
** License version 2.1 as published by the Free Software Foundation and
|
|
** appearing in the file LICENSE.LGPL included in the packaging of this
|
|
** file. Please review the following information to ensure the GNU Lesser
|
|
** General Public License version 2.1 requirements will be met:
|
|
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
|
|
**
|
|
** In addition, as a special exception, Nokia gives you certain additional
|
|
** rights. These rights are described in the Nokia Qt LGPL Exception
|
|
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
|
|
**
|
|
** GNU General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU General
|
|
** Public License version 3.0 as published by the Free Software Foundation
|
|
** and appearing in the file LICENSE.GPL included in the packaging of this
|
|
** file. Please review the following information to ensure the GNU General
|
|
** Public License version 3.0 requirements will be met:
|
|
** http://www.gnu.org/copyleft/gpl.html.
|
|
**
|
|
** Other Usage
|
|
** Alternatively, this file may be used in accordance with the terms and
|
|
** conditions contained in a signed written agreement between you and Nokia.
|
|
**
|
|
**
|
|
**
|
|
**
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#include "flickable.h"
|
|
|
|
#include <QtCore>
|
|
#include <QtWidgets>
|
|
|
|
class FlickableTicker: QObject
|
|
{
|
|
public:
|
|
FlickableTicker(Flickable *scroller) {
|
|
m_scroller = scroller;
|
|
}
|
|
|
|
void start(int interval) {
|
|
if (!m_timer.isActive())
|
|
m_timer.start(interval, this);
|
|
}
|
|
|
|
void stop() {
|
|
m_timer.stop();
|
|
}
|
|
|
|
protected:
|
|
void timerEvent(QTimerEvent *event) {
|
|
Q_UNUSED(event);
|
|
m_scroller->tick();
|
|
}
|
|
|
|
private:
|
|
Flickable *m_scroller;
|
|
QBasicTimer m_timer;
|
|
};
|
|
|
|
class FlickablePrivate
|
|
{
|
|
public:
|
|
typedef enum {
|
|
Steady,
|
|
Pressed,
|
|
ManualScroll,
|
|
AutoScroll,
|
|
Stop
|
|
} State;
|
|
|
|
State state;
|
|
int threshold;
|
|
QPoint pressPos;
|
|
QPoint offset;
|
|
QPoint delta;
|
|
QPoint speed;
|
|
FlickableTicker *ticker;
|
|
QTime timeStamp;
|
|
QWidget *target;
|
|
QList<QEvent*> ignoreList;
|
|
};
|
|
|
|
Flickable::Flickable()
|
|
{
|
|
d = new FlickablePrivate;
|
|
d->state = FlickablePrivate::Steady;
|
|
d->threshold = 10;
|
|
d->ticker = new FlickableTicker(this);
|
|
d->timeStamp = QTime::currentTime();
|
|
d->target = 0;
|
|
}
|
|
|
|
Flickable::~Flickable()
|
|
{
|
|
delete d;
|
|
}
|
|
|
|
void Flickable::setThreshold(int th)
|
|
{
|
|
if (th >= 0)
|
|
d->threshold = th;
|
|
}
|
|
|
|
int Flickable::threshold() const
|
|
{
|
|
return d->threshold;
|
|
}
|
|
|
|
void Flickable::setAcceptMouseClick(QWidget *target)
|
|
{
|
|
d->target = target;
|
|
}
|
|
|
|
static QPoint deaccelerate(const QPoint &speed, int a = 1, int max = 64)
|
|
{
|
|
int x = qBound(-max, speed.x(), max);
|
|
int y = qBound(-max, speed.y(), max);
|
|
x = (x == 0) ? x : (x > 0) ? qMax(0, x - a) : qMin(0, x + a);
|
|
y = (y == 0) ? y : (y > 0) ? qMax(0, y - a) : qMin(0, y + a);
|
|
return QPoint(x, y);
|
|
}
|
|
|
|
void Flickable::handleMousePress(QMouseEvent *event)
|
|
{
|
|
event->ignore();
|
|
|
|
if (event->button() != Qt::LeftButton)
|
|
return;
|
|
|
|
if (d->ignoreList.removeAll(event))
|
|
return;
|
|
|
|
switch (d->state) {
|
|
|
|
case FlickablePrivate::Steady:
|
|
event->accept();
|
|
d->state = FlickablePrivate::Pressed;
|
|
d->pressPos = event->pos();
|
|
break;
|
|
|
|
case FlickablePrivate::AutoScroll:
|
|
event->accept();
|
|
d->state = FlickablePrivate::Stop;
|
|
d->speed = QPoint(0, 0);
|
|
d->pressPos = event->pos();
|
|
d->offset = scrollOffset();
|
|
d->ticker->stop();
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Flickable::handleMouseRelease(QMouseEvent *event)
|
|
{
|
|
event->ignore();
|
|
|
|
if (event->button() != Qt::LeftButton)
|
|
return;
|
|
|
|
if (d->ignoreList.removeAll(event))
|
|
return;
|
|
|
|
QPoint delta;
|
|
|
|
switch (d->state) {
|
|
|
|
case FlickablePrivate::Pressed:
|
|
event->accept();
|
|
d->state = FlickablePrivate::Steady;
|
|
if (d->target) {
|
|
QMouseEvent *event1 = new QMouseEvent(QEvent::MouseButtonPress,
|
|
d->pressPos, Qt::LeftButton,
|
|
Qt::LeftButton, Qt::NoModifier);
|
|
QMouseEvent *event2 = new QMouseEvent(*event);
|
|
d->ignoreList << event1;
|
|
d->ignoreList << event2;
|
|
QApplication::postEvent(d->target, event1);
|
|
QApplication::postEvent(d->target, event2);
|
|
}
|
|
break;
|
|
|
|
case FlickablePrivate::ManualScroll:
|
|
event->accept();
|
|
delta = event->pos() - d->pressPos;
|
|
if (d->timeStamp.elapsed() > 100) {
|
|
d->timeStamp = QTime::currentTime();
|
|
d->speed = delta - d->delta;
|
|
d->delta = delta;
|
|
}
|
|
d->offset = scrollOffset();
|
|
d->pressPos = event->pos();
|
|
if (d->speed == QPoint(0, 0)) {
|
|
d->state = FlickablePrivate::Steady;
|
|
} else {
|
|
d->speed /= 4;
|
|
d->state = FlickablePrivate::AutoScroll;
|
|
d->ticker->start(20);
|
|
}
|
|
break;
|
|
|
|
case FlickablePrivate::Stop:
|
|
event->accept();
|
|
d->state = FlickablePrivate::Steady;
|
|
d->offset = scrollOffset();
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Flickable::handleMouseMove(QMouseEvent *event)
|
|
{
|
|
event->ignore();
|
|
|
|
if (!(event->buttons() & Qt::LeftButton))
|
|
return;
|
|
|
|
if (d->ignoreList.removeAll(event))
|
|
return;
|
|
|
|
QPoint delta;
|
|
|
|
switch (d->state) {
|
|
|
|
case FlickablePrivate::Pressed:
|
|
case FlickablePrivate::Stop:
|
|
delta = event->pos() - d->pressPos;
|
|
if (delta.x() > d->threshold || delta.x() < -d->threshold ||
|
|
delta.y() > d->threshold || delta.y() < -d->threshold) {
|
|
d->timeStamp = QTime::currentTime();
|
|
d->state = FlickablePrivate::ManualScroll;
|
|
d->delta = QPoint(0, 0);
|
|
d->pressPos = event->pos();
|
|
event->accept();
|
|
}
|
|
break;
|
|
|
|
case FlickablePrivate::ManualScroll:
|
|
event->accept();
|
|
delta = event->pos() - d->pressPos;
|
|
setScrollOffset(d->offset - delta);
|
|
if (d->timeStamp.elapsed() > 100) {
|
|
d->timeStamp = QTime::currentTime();
|
|
d->speed = delta - d->delta;
|
|
d->delta = delta;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Flickable::tick()
|
|
{
|
|
if (d->state == FlickablePrivate:: AutoScroll) {
|
|
d->speed = deaccelerate(d->speed);
|
|
setScrollOffset(d->offset - d->speed);
|
|
d->offset = scrollOffset();
|
|
if (d->speed == QPoint(0, 0)) {
|
|
d->state = FlickablePrivate::Steady;
|
|
d->ticker->stop();
|
|
}
|
|
} else {
|
|
d->ticker->stop();
|
|
}
|
|
}
|