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# imagescaling.h Example File
qtconcurrent/imagescaling/imagescaling.h

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     #ifndef IMAGESCALING_H
     #define IMAGESCALING_H

     #include <QtGui>

     #ifndef QT_NO_CONCURRENT

     class Images : public QWidget
     {
     Q_OBJECT
     public:
         Images(QWidget *parent = 0);
         ~Images();
     public Q_SLOTS:
         void open();
         void showImage(int num);
         void finished();
     private:
         QPushButton *openButton;
         QPushButton *cancelButton;
         QVBoxLayout *mainLayout;
         QList<QLabel *> labels;
         QGridLayout *imagesLayout;
         QFutureWatcher<QImage> *imageScaling;
     };

     #else

     // Dummy class required because QT_NO_CONCURRENT is not set when moc is run.
     class Images : public QWidget
     {
     Q_OBJECT
     public Q_SLOTS:
         void open() {}
         void showImage(int) {}
         void finished() {}
     };

     #endif // QT_NO_CONCURRENT

     #endif // IMAGESCALING_H