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imagewidget.h Example File
gestures/imagegestures/imagewidget.h

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 #ifndef IMAGEWIDGET_H
 #define IMAGEWIDGET_H

 #include <QWidget>
 #include <QImage>
 #include <QtGui>

 class QGestureEvent;
 class QPanGesture;
 class QPinchGesture;
 class QSwipeGesture;

 class ImageWidget : public QWidget
 {
     Q_OBJECT

 public:
     ImageWidget(QWidget *parent = 0);
     void openDirectory(const QString &path);

 protected:
     bool event(QEvent *event);
     void paintEvent(QPaintEvent *event);
     void resizeEvent(QResizeEvent *event);
     void mouseDoubleClickEvent(QMouseEvent *event);

 private:
     bool gestureEvent(QGestureEvent *event);
     void panTriggered(QPanGesture*);
     void pinchTriggered(QPinchGesture*);
     void swipeTriggered(QSwipeGesture*);

     void updateImage();
     QImage loadImage(const QString &fileName);
     void loadImage();
     void goNextImage();
     void goPrevImage();
     void goToImage(int index);

     QString path;
     QStringList files;
     int position;

     QImage prevImage, nextImage;
     QImage currentImage;

     float horizontalOffset;
     float verticalOffset;
     float rotationAngle;
     float scaleFactor;
     float currentStepScaleFactor;
 };

 #endif