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Файл примера mainwindow.h
painting/svgviewer/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>
 #include <QString>

 class SvgView;

 class QAction;
 class QGraphicsView;
 class QGraphicsScene;
 class QGraphicsRectItem;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

 public slots:
     void openFile(const QString &path = QString());
     void setRenderer(QAction *action);

 private:
     QAction *m_nativeAction;
     QAction *m_glAction;
     QAction *m_imageAction;
     QAction *m_highQualityAntialiasingAction;
     QAction *m_backgroundAction;
     QAction *m_outlineAction;

     SvgView *m_view;

     QString m_currentPath;
 };

 #endif