plasma-framework/animations/fade.cpp
2009-12-04 19:06:01 +00:00

99 lines
2.5 KiB
C++

/*
* Copyright 2009 Mehmet Ali Akmanalp <makmanalp@wpi.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "fade_p.h"
#include <QRect>
#include <kdebug.h>
namespace Plasma
{
FadeAnimation::FadeAnimation(QObject *parent)
: Animation(parent),
m_startOpacity(0),
m_targetOpacity(1)
{
}
FadeAnimation::~FadeAnimation()
{
}
void FadeAnimation::setStartOpacity(qreal factor)
{
m_startOpacity = qBound(qreal(0.0), factor, qreal(1.0));
}
qreal FadeAnimation::startOpacity() const
{
return m_startOpacity;
}
void FadeAnimation::setTargetOpacity(qreal factor)
{
m_targetOpacity = qBound(qreal(0.0), factor, qreal(1.0));
}
qreal FadeAnimation::targetOpacity() const
{
return m_targetOpacity;
}
void FadeAnimation::setWidgetToAnimate(QGraphicsWidget *widget)
{
if (widget == widgetToAnimate()) {
return;
}
Animation::setWidgetToAnimate(widget);
if (widget) {
widget->setOpacity(m_startOpacity);
}
}
void FadeAnimation::updateState(QAbstractAnimation::State newState, QAbstractAnimation::State oldState)
{
QGraphicsWidget *w = widgetToAnimate();
if (!w) {
return;
}
if (oldState == Stopped && newState == Running) {
w->setOpacity(direction() == Forward ? m_startOpacity : m_targetOpacity);
} else if (newState == Stopped) {
w->setOpacity(direction() == Forward ? m_targetOpacity : m_startOpacity);
}
}
void FadeAnimation::updateCurrentTime(int currentTime)
{
QGraphicsWidget *w = widgetToAnimate();
if (w) {
qreal delta = currentTime / qreal(duration());
delta = (m_startOpacity - m_targetOpacity) * delta;
w->setOpacity(m_startOpacity - delta);
}
Animation::updateCurrentTime(currentTime);
}
} //namespace Plasma