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/***************************************************************************
* Copyright (C) 2006 by Peter Penz <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, 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 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 "pixmapviewer.h"
#include <KIconLoader>
#include <QPainter>
#include <QPixmap>
#include <QStyle>
PixmapViewer::PixmapViewer(QWidget* parent, Transition transition) :
QWidget(parent),
m_transition(transition),
m_animationStep(0),
m_sizeHint()
{
setMinimumWidth(KIconLoader::SizeEnormous);
setMinimumHeight(KIconLoader::SizeEnormous);
m_animation.setDuration(150);
m_animation.setCurveShape(QTimeLine::LinearCurve);
if (m_transition != NoTransition) {
connect(&m_animation, &QTimeLine::valueChanged, this, static_cast<void(PixmapViewer::*)()>(&PixmapViewer::update));
connect(&m_animation, &QTimeLine::finished, this, &PixmapViewer::checkPendingPixmaps);
}
}
PixmapViewer::~PixmapViewer()
{
}
void PixmapViewer::setPixmap(const QPixmap& pixmap)
{
if (pixmap.isNull()) {
return;
}
if ((m_transition != NoTransition) && (m_animation.state() == QTimeLine::Running)) {
m_pendingPixmaps.enqueue(pixmap);
if (m_pendingPixmaps.count() > 5) {
// don't queue more than 5 pixmaps
m_pendingPixmaps.takeFirst();
}
return;
}
m_oldPixmap = m_pixmap.isNull() ? pixmap : m_pixmap;
m_pixmap = pixmap;
update();
const bool animate = (m_transition != NoTransition) &&
(m_pixmap.size() != m_oldPixmap.size());
if (animate) {
m_animation.start();
}
}
void PixmapViewer::setSizeHint(const QSize& size)
{
m_sizeHint = size;
updateGeometry();
}
QSize PixmapViewer::sizeHint() const
{
return m_sizeHint;
}
void PixmapViewer::paintEvent(QPaintEvent* event)
{
QWidget::paintEvent(event);
QPainter painter(this);
if (m_transition != NoTransition) {
const float value = m_animation.currentValue();
const int scaledWidth = static_cast<int>((m_oldPixmap.width() * (1.0 - value)) + (m_pixmap.width() * value));
const int scaledHeight = static_cast<int>((m_oldPixmap.height() * (1.0 - value)) + (m_pixmap.height() * value));
const bool useOldPixmap = (m_transition == SizeTransition) &&
(m_oldPixmap.width() > m_pixmap.width());
const QPixmap& largePixmap = useOldPixmap ? m_oldPixmap : m_pixmap;
if (!largePixmap.isNull()) {
const QPixmap scaledPixmap = largePixmap.scaled(scaledWidth,
scaledHeight,
Qt::IgnoreAspectRatio,
Qt::FastTransformation);
style()->drawItemPixmap(&painter, rect(), Qt::AlignCenter, scaledPixmap);
}
} else {
style()->drawItemPixmap(&painter, rect(), Qt::AlignCenter, m_pixmap);
}
}
void PixmapViewer::checkPendingPixmaps()
{
if (m_pendingPixmaps.count() > 0) {
QPixmap pixmap = m_pendingPixmaps.dequeue();
m_oldPixmap = m_pixmap.isNull() ? pixmap : m_pixmap;
m_pixmap = pixmap;
update();
m_animation.start();
} else {
m_oldPixmap = m_pixmap;
}
}
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