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****************************************************************************/

#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;

}