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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: openBossa - INdT (renato.chencarek@openbossa.org)
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, 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.
**
** If you have questions regarding the use of this file, please contact
** the openBossa stream from INdT (renato.chencarek@openbossa.org).
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QObject>
#include <QString>
#include <QTimer>
#include <QGraphicsPixmapItem>
#include <QPropertyAnimation>
#include <QAbstractAnimation>
#include "designinformation.h"
#include "scrollbar.h"
/*! \class ScrollBar
*
* \brief Fade in/out animations and position update callback
*
* Stick this over your items viewport and send \c updatePosition notifications
* to render the knob into the new position. It doesn't handle user input.
*/
ScrollBar::ScrollBar(QGraphicsItem* parent)
: QObject()
, QGraphicsPixmapItem(parent)
, m_state(Hidden)
, m_maximum(0)
, m_value(0)
, m_timer()
, m_animation(0)
, m_knob(this)
{
hide();
setValue(m_value);
setOpacity(0);
m_timer.setSingleShot(true);
connect(&m_timer, SIGNAL(timeout()), this, SLOT(timeout()));
updateUI();
}
void ScrollBar::updateUI()
{
setPixmap(DesignInformation::getPixmap("list.scrollbar.portrait"));
m_knob.setPixmap(DesignInformation::getPixmap("list.scrollbar.knob"));
}
qreal ScrollBar::maximum() { return m_maximum; }
void ScrollBar::setMaximum(qreal max)
{
if (max >= 0)
m_maximum = max;
}
qreal ScrollBar::value() { return m_value; }
void ScrollBar::setValue(qreal value)
{
if (value < 0 || value > m_maximum)
return;
m_value = value;
int min = boundingRect().topLeft().y();
int max = boundingRect().bottomLeft().y() - m_knob.boundingRect().height();
m_knob.setPos(0, (value * (max - min)) / m_maximum);
}
void ScrollBar::updatePosition(qreal value)
{
switch (m_state) {
case Visible:
startTimer();
case ShowAnimation:
break;
case HideAnimation:
m_animation->stop();
case Hidden:
QAbstractAnimation* anim = showAnimation();
anim->start(QAbstractAnimation::DeleteWhenStopped);
m_state = ShowAnimation;
break;
}
show();
setValue(value);
}
void ScrollBar::setLandscapeOrientation()
{
setPixmap(DesignInformation::getPixmap("list.scrollbar.landscape"));
setValue(m_value);
}
void ScrollBar::setPortraitOrientation()
{
setPixmap(DesignInformation::getPixmap("list.scrollbar.portrait"));
setValue(m_value);
}
void ScrollBar::startTimer()
{
if (m_timer.isActive())
m_timer.stop();
m_timer.start(1000);
}
void ScrollBar::timeout()
{
if (Visible != m_state)
return;
m_state = HideAnimation;
QAbstractAnimation* anim = hideAnimation();
m_animation = anim;
anim->start(QAbstractAnimation::DeleteWhenStopped);
}
void ScrollBar::animationFinished()
{
switch(m_state) {
case ShowAnimation:
startTimer();
m_state = Visible;
break;
case HideAnimation:
hide();
m_state = Hidden;
m_animation = 0;
break;
default:
break;
}
}
QPropertyAnimation* ScrollBar::propertyAnimation(const char* name)
{
QPropertyAnimation* anim = new QPropertyAnimation();
anim->setTargetObject(this);
anim->setPropertyName(name);
anim->setEasingCurve(QEasingCurve::OutExpo);
anim->setDuration(500);
connect(anim, SIGNAL(finished()), this, SLOT(animationFinished()));
return anim;
}
QAbstractAnimation* ScrollBar::showAnimation()
{
QPropertyAnimation* anim = propertyAnimation("opacity");
anim->setEndValue(1);
return anim;
}
QAbstractAnimation* ScrollBar::hideAnimation()
{
QPropertyAnimation* anim = propertyAnimation("opacity");
anim->setEndValue(0);
return anim;
}
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