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Файл примера mainwindow.h
itemviews/pixelator/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>

 class ImageModel;
 class QAction;
 class QTableView;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

     void openImage(const QString &fileName);

 public slots:
     void chooseImage();
     void printImage();
     void showAboutBox();
     void updateView();

 private:
     ImageModel *model;
     QAction *printAction;
     QString currentPath;
     QTableView *view;
 };

 #endif