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Файл примера mainwindow.h
itemviews/chart/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>

 class QAbstractItemModel;
 class QAbstractItemView;
 class QItemSelectionModel;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

 private slots:
     void openFile(const QString &path = QString());
     void saveFile();

 private:
     void setupModel();
     void setupViews();

     QAbstractItemModel *model;
     QAbstractItemView *pieChart;
     QItemSelectionModel *selectionModel;
 };

 #endif