/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the demonstration applications of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "chasewidget.h"+
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+
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#include <QtCore/QPoint>+
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+
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#include <QtGui/QApplication>+
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#include <QtGui/QHideEvent>+
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#include <QtGui/QPainter>+
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#include <QtGui/QPaintEvent>+
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#include <QtGui/QShowEvent>+
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+
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ChaseWidget::ChaseWidget(QWidget *parent, QPixmap pixmap, bool pixmapEnabled)+
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    : QWidget(parent)+
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    , m_segment(0)+
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    , m_delay(100)+
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    , m_step(40)+
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    , m_timerId(-1)+
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    , m_animated(false)+
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    , m_pixmap(pixmap)+
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    , m_pixmapEnabled(pixmapEnabled)+
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{+
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}+
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+
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void ChaseWidget::setAnimated(bool value)+
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{+
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    if (m_animated == value)+
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        return;+
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    m_animated = value;+
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    if (m_timerId != -1) {+
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        killTimer(m_timerId);+
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        m_timerId = -1;+
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    }+
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    if (m_animated) {+
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        m_segment = 0;+
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        m_timerId = startTimer(m_delay);+
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    }+
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    update();+
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}+
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+
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void ChaseWidget::paintEvent(QPaintEvent *event)+
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{+
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    Q_UNUSED(event);+
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    QPainter p(this);+
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    if (m_pixmapEnabled && !m_pixmap.isNull()) {+
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        p.drawPixmap(0, 0, m_pixmap);+
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        return;+
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    }+
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+
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    const int extent = qMin(width() - 8, height() - 8);+
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    const int displ = extent / 4;+
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    const int ext = extent / 4 - 1;+
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+
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    p.setRenderHint(QPainter::Antialiasing, true);+
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+
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    if(m_animated)+
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        p.setPen(Qt::gray);+
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    else+
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        p.setPen(QPen(palette().dark().color()));+
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+
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    p.translate(width() / 2, height() / 2); // center+
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+
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    for (int segment = 0; segment < segmentCount(); ++segment) {+
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        p.rotate(QApplication::isRightToLeft() ? m_step : -m_step);+
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        if(m_animated)+
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            p.setBrush(colorForSegment(segment));+
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        else+
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            p.setBrush(palette().background());+
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        p.drawEllipse(QRect(displ, -ext / 2, ext, ext));+
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    }+
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}+
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+
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QSize ChaseWidget::sizeHint() const+
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{+
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    return QSize(32, 32);+
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}+
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+
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void ChaseWidget::timerEvent(QTimerEvent *event)+
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{+
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    if (event->timerId() == m_timerId) {+
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        ++m_segment;+
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        update();+
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    }+
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    QWidget::timerEvent(event);+
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}+
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+
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QColor ChaseWidget::colorForSegment(int seg) const+
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{+
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    int index = ((seg + m_segment) % segmentCount());+
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    int comp = qMax(0, 255 - (index * (255 / segmentCount())));+
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    return QColor(comp, comp, comp, 255);+
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}+
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+
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int ChaseWidget::segmentCount() const+
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{+
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    return 360 / m_step;+
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}+
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+
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void ChaseWidget::setPixmapEnabled(bool enable)+
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{+
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    m_pixmapEnabled = enable;+
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}+
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+
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