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# chart/chartform.h Example File

    #ifndef CHARTFORM_H
    #define CHARTFORM_H

    #include "element.h"

    #include <qmainwindow.h>
    #include <qstringlist.h>

    class CanvasView;

    class QAction;
    class QCanvas;
    class QFont;
    class QPrinter;
    class QString;

    class ChartForm: public QMainWindow
    {
        Q_OBJECT
    public:
        enum { MAX_ELEMENTS = 100 };
        enum { MAX_RECENTFILES = 9 }; // Must not exceed 9
        enum ChartType { PIE, VERTICAL_BAR, HORIZONTAL_BAR };
        enum AddValuesType { NO, YES, AS_PERCENTAGE };

        ChartForm( const QString& filename );
        ~ChartForm();

        int chartType() { return m_chartType; }
        void setChanged( bool changed = TRUE ) { m_changed = changed; }
        void drawElements();

        QPopupMenu *optionsMenu; // Why public? See canvasview.cpp

    private slots:
        void fileNew();
        void fileOpen();
        void fileOpenRecent( int index );
        void fileSave();
        void fileSaveAs();
        void fileSaveAsPixmap();
        void filePrint();
        void fileQuit();
        void optionsSetData();
        void updateChartType( QAction *action );
        void optionsSetFont();
        void optionsSetOptions();
        void helpHelp();
        void helpAbout();
        void helpAboutQt();
        void saveOptions();

    private:
        void init();
        void load( const QString& filename );
        bool okToClear();
        void drawPieChart( const double scales[], double total, int count );
        void drawVerticalBarChart( const double scales[], double total, int count );
        void drawHorizontalBarChart( const double scales[], double total, int count );

        QString valueLabel( const QString& label, double value, double total );
        void updateRecentFiles( const QString& filename );
        void updateRecentFilesMenu();
        void setChartType( ChartType chartType );

        QPopupMenu *fileMenu;
        QAction *optionsPieChartAction;
        QAction *optionsHorizontalBarChartAction;
        QAction *optionsVerticalBarChartAction;

        QString m_filename;
        QStringList m_recentFiles;
        QCanvas *m_canvas;
        CanvasView *m_canvasView;
        bool m_changed;
        ElementVector m_elements;
        QPrinter *m_printer;
        ChartType m_chartType;
        AddValuesType m_addValues;
        int m_decimalPlaces;
        QFont m_font;
    };

    #endif