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** This file is part of the demonstration applications of the Qt Toolkit.
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module chasewidget;


import QtGui.QWidget;

import QtCore.QSize;
import QtGui.QColor;
import QtGui.QPixmap;

import QtCore.QPoint;

import QtGui.QApplication;
import QtGui.QHideEvent;
import QtGui.QPainter;
import QtGui.QPaintEvent;
import QtGui.QShowEvent;

/*
QT_BEGIN_NAMESPACE
class QHideEvent;
class QShowEvent;
class QPaintEvent;
class QTimerEvent;
QT_END_NAMESPACE
*/

class ChaseWidget : public QWidget
{
    Q_OBJECT
public:
    this(QWidget *parent = 0, QPixmap pixmap = QPixmap(), bool pixmapEnabled = false)
{
	super(parent);
	m_segment = 0;
     m_delay = 100;
     m_step = 40;
     m_timerId = -1;
	 m_animated = false;
 m_pixmap = pixmap;
     m_pixmapEnabled = pixmapEnabled;
}

    void 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 setPixmapEnabled(bool enable);
{
    m_pixmapEnabled = enable;
}


    QSize sizeHint()
{
    return QSize(32, 32);
}

protected:
    void paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event);
    QPainter p(this);
    if (m_pixmapEnabled && !m_pixmap.isNull()) {
        p.drawPixmap(0, 0, m_pixmap);
        return;
    }

    int extent = qMin(width() - 8, height() - 8);
    int displ = extent / 4;
    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));
    }
}

    void timerEvent(QTimerEvent *event)
{
    if (event->timerId() == m_timerId) {
        ++m_segment;
        update();
    }
    QWidget.timerEvent(event);
}

private:
    int segmentCount()
{
    return 360 / m_step;
}


QColor colorForSegment(int seg)
{
    int index = ((seg + m_segment) % segmentCount());
    int comp = qMax(0, 255 - (index * (255 / segmentCount())));
    return QColor(comp, comp, comp, 255);
}

    int m_segment;
    int m_delay;
    int m_step;
    int m_timerId;
    bool m_animated;
    QPixmap m_pixmap;
    bool m_pixmapEnabled;
}