PNG-based animation

I'd like to display a busy-animation in my program.

KDE-Themes come with process-working-kde.png and process-working.png, which contain a number of pictures "below" each other (see attachment). What is the easiest way of telling to Qt to make an animation out of this? It must be used in KDE-apps, but I couldn't find the corresponding code…

Thanks for your help!

Header:

Code:

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#ifndef ANIM_H
#define ANIM_H
#include <QWidget>
#include <QString>
#include <QTimer>
#include <QLabel>
#include <QList>
#include <QPixmap>
 
class AnimatedLabel : public QLabel
{
Q_OBJECT
 
public:
    AnimatedLabel(const QString & image, const int imageCount,  QWidget* parent = 0);
 
private slots:
    void changeImage();
 
private:
    QList<QPixmap> pixmaps;
    int currentPixmap;
    QTimer timer;
};
 
#endif // ANIM_H

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and source:

Code:

---

#include "anim.h"
#include <QApplication>
#include <QImage>
 
AnimatedLabel::AnimatedLabel(const QString &image, const int imageCount, QWidget *parent)
    :     QLabel(parent), currentPixmap(0)
{
    QImage img;
    img.load(image);
    int subImageHeight = img.height() / imageCount;
 
    for (int i = 0; i < imageCount; i++)
    {
        QImage subImage = img.copy(0, i * subImageHeight, img.width(), subImageHeight);
        pixmaps.push_back(QPixmap::fromImage(subImage));
    }
 
    connect(&timer, SIGNAL(timeout()), SLOT(changeImage()));
    timer.start(100);
    changeImage();
}
 
void AnimatedLabel::changeImage()
{
    if (currentPixmap >= pixmaps.length())
        currentPixmap = 0;
 
    setPixmap(pixmaps.at(currentPixmap));
 
    currentPixmap++;
}
 
int main(int argc, char *argv[])
{
   QApplication a(argc, argv);
    AnimatedLabel bt("process-working.png", 8);
    bt.show();
    return a.exec();
}

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Awesome, thanks for the complete code!