mainwindow.h Example File
richtext/calendar/mainwindow.h
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    #ifndef MAINWINDOW_H
    #define MAINWINDOW_H
    #include <QDate>
    #include <QMainWindow>
    class QTextBrowser;
    class MainWindow : public QMainWindow
    {
        Q_OBJECT
    public:
        MainWindow();
    public slots:
        void setFontSize(int size);
        void setMonth(int month);
        void setYear(QDate date);
    private:
        void insertCalendar();
        int fontSize;
        QDate selectedDate;
        QTextBrowser *editor;
    };
    #endif