void setFontData(FontData aFontData)
    {
        if (aFontData == null)
            aFontData = HexEditControl.DEFAULT_FONT_DATA;
        sampleFontData = aFontData;
        refreshWidgets();
    }
Set preferences to show a font. Use null to show default font.

@param aFontData the font to be shown.
plugins/org.jkiss.dbeaver.ui.editors.hex/src/org/jkiss/dbeaver/ui/editors/binary/pref/HexPreferencesManager.java