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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "chasewidget.h"
#include <QtCore/QPoint>
#include <QtGui/QApplication>
#include <QtGui/QHideEvent>
#include <QtGui/QPainter>
#include <QtGui/QPaintEvent>
#include <QtGui/QShowEvent>
ChaseWidget::ChaseWidget(QWidget *parent, QPixmap pixmap, bool pixmapEnabled)
: QWidget(parent)
, m_segment(0)
, m_delay(100)
, m_step(40)
, m_timerId(-1)
, m_animated(false)
, m_pixmap(pixmap)
, m_pixmapEnabled(pixmapEnabled)
{
}
void ChaseWidget::setAnimated(bool value)
{
if (m_animated == value)
return;
m_animated = value;
if (m_timerId != -1) {
killTimer(m_timerId);
m_timerId = -1;
}
if (m_animated) {
m_segment = 0;
m_timerId = startTimer(m_delay);
}
update();
}
void ChaseWidget::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter p(this);
if (m_pixmapEnabled && !m_pixmap.isNull()) {
p.drawPixmap(0, 0, m_pixmap);
return;
}
const int extent = qMin(width() - 8, height() - 8);
const int displ = extent / 4;
const int ext = extent / 4 - 1;
p.setRenderHint(QPainter::Antialiasing, true);
if(m_animated)
p.setPen(Qt::gray);
else
p.setPen(QPen(palette().dark().color()));
p.translate(width() / 2, height() / 2); // center
for (int segment = 0; segment < segmentCount(); ++segment) {
p.rotate(QApplication::isRightToLeft() ? m_step : -m_step);
if(m_animated)
p.setBrush(colorForSegment(segment));
else
p.setBrush(palette().background());
p.drawEllipse(QRect(displ, -ext / 2, ext, ext));
}
}
QSize ChaseWidget::sizeHint() const
{
return QSize(32, 32);
}
void ChaseWidget::timerEvent(QTimerEvent *event)
{
if (event->timerId() == m_timerId) {
++m_segment;
update();
}
QWidget::timerEvent(event);
}
QColor ChaseWidget::colorForSegment(int seg) const
{
int index = ((seg + m_segment) % segmentCount());
int comp = qMax(0, 255 - (index * (255 / segmentCount())));
return QColor(comp, comp, comp, 255);
}
int ChaseWidget::segmentCount() const
{
return 360 / m_step;
}
void ChaseWidget::setPixmapEnabled(bool enable)
{
m_pixmapEnabled = enable;
}
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