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J-P Nurmi authored
Change-Id: I5642e8dc5f62b48aaf086820699cf41f689cec1a Reviewed-by:Gabriel de Dietrich <gabriel.dedietrich@digia.com>
6a218522
/******************************************************************************** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).** Contact: http://www.qt-project.org/legal**** This file is part of the Qt Quick Controls module of the Qt Toolkit.**** $QT_BEGIN_LICENSE:LGPL$** Commercial License Usage** Licensees holding valid commercial Qt licenses may use this file in** accordance with the commercial license agreement provided with the** Software or, alternatively, in accordance with the terms contained in** a written agreement between you and Digia. For licensing terms and** conditions see http://qt.digia.com/licensing. For further information** use the contact form at http://qt.digia.com/contact-us.**** GNU Lesser General Public License Usage** Alternatively, 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, Digia gives you certain additional** rights. These rights are described in the Digia 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.****** $QT_END_LICENSE$******************************************************************************/#include "qquickwheelarea_p.h"QT_BEGIN_NAMESPACE// On Mac OS X, the scrolling speed in Safari is roughly 2.5 times faster// than in TextEdit (the native app). The former is using high-resolution// pixel-based delta values as they are, which is fine for a typical web// content, whereas the latter evidently makes scrolling slower to make it// feel natural and more precise for typical document type of content.// => we'll compromise between the two for now, and pick an arbitrary value// to make the pixel-based scrolling speed something between the twostatic const qreal pixelDeltaAdjustment = 0.5;// The default scroll speed for typical angle-based mouse wheels. The value// comes originally from QTextEdit, which sets 20px steps by default.static const qreal defaultScrollSpeed = 20.0;QQuickWheelArea::QQuickWheelArea(QQuickItem *parent) : QQuickItem(parent), m_horizontalMinimumValue(0), m_horizontalMaximumValue(0), m_verticalMinimumValue(0), m_verticalMaximumValue(0), m_horizontalValue(0), m_verticalValue(0), m_verticalDelta(0), m_horizontalDelta(0), m_scrollSpeed(defaultScrollSpeed), m_active(false)7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
{
}
QQuickWheelArea::~QQuickWheelArea()
{
}
void QQuickWheelArea::wheelEvent(QWheelEvent *we)
{
if (we->phase() == Qt::ScrollBegin)
setActive(true);
else if (we->phase() == Qt::ScrollEnd)
setActive(false);
QPoint numPixels = we->pixelDelta();
QPoint numDegrees = we->angleDelta() / 8;
if (!numPixels.isNull()) {
setHorizontalDelta(numPixels.x() * pixelDeltaAdjustment);
setVerticalDelta(numPixels.y() * pixelDeltaAdjustment);
} else if (!numDegrees.isNull()) {
setHorizontalDelta(numDegrees.x() / 15.0 * m_scrollSpeed);
setVerticalDelta(numDegrees.y() / 15.0 * m_scrollSpeed);
}
we->accept();
}
void QQuickWheelArea::setHorizontalMinimumValue(qreal value)
{
m_horizontalMinimumValue = value;
}
qreal QQuickWheelArea::horizontalMinimumValue() const
{
return m_horizontalMinimumValue;
}
void QQuickWheelArea::setHorizontalMaximumValue(qreal value)
{
m_horizontalMaximumValue = value;
}
qreal QQuickWheelArea::horizontalMaximumValue() const
{
return m_horizontalMaximumValue;
}
void QQuickWheelArea::setVerticalMinimumValue(qreal value)
{
m_verticalMinimumValue = value;
}
qreal QQuickWheelArea::verticalMinimumValue() const
{
return m_verticalMinimumValue;
}
void QQuickWheelArea::setVerticalMaximumValue(qreal value)
{
m_verticalMaximumValue = value;
}
qreal QQuickWheelArea::verticalMaximumValue() const
{
return m_verticalMaximumValue;
}
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void QQuickWheelArea::setHorizontalValue(qreal value)
{
value = qBound<qreal>(m_horizontalMinimumValue, value, m_horizontalMaximumValue);
if (value != m_horizontalValue) {
m_horizontalValue = value;
emit horizontalValueChanged();
}
}
qreal QQuickWheelArea::horizontalValue() const
{
return m_horizontalValue;
}
void QQuickWheelArea::setVerticalValue(qreal value)
{
value = qBound<qreal>(m_verticalMinimumValue, value, m_verticalMaximumValue);
if (value != m_verticalValue) {
m_verticalValue = value;
emit verticalValueChanged();
}
}
qreal QQuickWheelArea::verticalValue() const
{
return m_verticalValue;
}
void QQuickWheelArea::setVerticalDelta(qreal value)
{
m_verticalDelta = value;
setVerticalValue(m_verticalValue - m_verticalDelta);
emit verticalWheelMoved();
}
qreal QQuickWheelArea::verticalDelta() const
{
return m_verticalDelta;
}
void QQuickWheelArea::setHorizontalDelta(qreal value)
{
m_horizontalDelta = value;
setHorizontalValue(m_horizontalValue - m_horizontalDelta);
emit horizontalWheelMoved();
}
qreal QQuickWheelArea::horizontalDelta() const
{
return m_horizontalDelta;
}
void QQuickWheelArea::setScrollSpeed(qreal value)
{
if (value != m_scrollSpeed) {
m_scrollSpeed = value;
emit scrollSpeedChanged();
}
}
qreal QQuickWheelArea::scrollSpeed() const
{
return m_scrollSpeed;
}
bool QQuickWheelArea::isActive() const
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{
return m_active;
}
void QQuickWheelArea::setActive(bool active)
{
if (active != m_active) {
m_active = active;
emit activeChanged();
}
}
QT_END_NAMESPACE