Qt 5.6 | Qt Widgets | Image Viewer Example | imageviewer.h Example File

Qt 5.6.3 Reference Documentation

# imageviewer.h Example File

widgets/imageviewer/imageviewer.h

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      ** This file is part of the examples of the Qt Toolkit.
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      #ifndef IMAGEVIEWER_H
      #define IMAGEVIEWER_H

      #include <QMainWindow>
      #include <QImage>
      #ifndef QT_NO_PRINTER
      #include <QPrinter>
      #endif

      class QAction;
      class QLabel;
      class QMenu;
      class QScrollArea;
      class QScrollBar;

      class ImageViewer : public QMainWindow
      {
          Q_OBJECT

      public:
          ImageViewer();
          bool loadFile(const QString &);

      private slots:
          void open();
          void saveAs();
          void print();
          void copy();
          void paste();
          void zoomIn();
          void zoomOut();
          void normalSize();
          void fitToWindow();
          void about();

      private:
          void createActions();
          void createMenus();
          void updateActions();
          bool saveFile(const QString &fileName);
          void setImage(const QImage &newImage);
          void scaleImage(double factor);
          void adjustScrollBar(QScrollBar *scrollBar, double factor);

          QImage image;
          QLabel *imageLabel;
          QScrollArea *scrollArea;
          double scaleFactor;

      #ifndef QT_NO_PRINTER
          QPrinter printer;
      #endif

          QAction *saveAsAct;
          QAction *printAct;
          QAction *copyAct;
          QAction *zoomInAct;
          QAction *zoomOutAct;
          QAction *normalSizeAct;
          QAction *fitToWindowAct;
      };

      #endif