qt5base-lts/examples/qtconcurrent/imagescaling/imagescaling.h

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#ifndef IMAGESCALING_H
#define IMAGESCALING_H

#include <QtWidgets>
#include <QtConcurrent>

#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;
    QPushButton *pauseButton;
    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