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mainwindow.h Example File
tools/codecs/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QList>
 #include <QMainWindow>

 class QAction;
 class QMenu;
 class QTextCodec;
 class QTextEdit;

 class PreviewForm;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

 private slots:
     void open();
     void save();
     void about();
     void aboutToShowSaveAsMenu();

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

     QTextEdit *textEdit;
     PreviewForm *previewForm;
     QList<QTextCodec *> codecs;

     QMenu *fileMenu;
     QMenu *helpMenu;
     QMenu *saveAsMenu;
     QAction *openAct;
     QList<QAction *> saveAsActs;
     QAction *exitAct;
     QAction *aboutAct;
     QAction *aboutQtAct;
 };

 #endif