mainwindow.h Example File
linguist/arrowpad/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>

 class QAction;
 class QMenu;

 class ArrowPad;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

 private:
     ArrowPad *arrowPad;
     QMenu *fileMenu;
     QAction *exitAct;
 };

 #endif