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mainwindow.h Example File
help/simpletextviewer/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QtGui/QMainWindow>

 class Assistant;
 class TextEdit;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();
     void showDocumentation(const QString &file);

 private slots:
     void about();
     void showDocumentation();
     void open();

 protected:
     void closeEvent(QCloseEvent *event);

 private:
     void createActions();
     void createMenus();

     Assistant *assistant;
     TextEdit *textViewer;

     QMenu *fileMenu;
     QMenu *helpMenu;

     QAction *assistantAct;
     QAction *clearAct;
     QAction *openAct;
     QAction *exitAct;
     QAction *aboutAct;
     QAction *aboutQtAct;
 };

 #endif