def create_fontgroup(self, option=None, text=None, title=None,
                         tip=None, fontfilters=None, without_group=False):
        """Option=None -> setting plugin font"""

        if title:
            fontlabel = QLabel(title)
        else:
            fontlabel = QLabel(_("Font"))
        fontbox = QFontComboBox()

        if fontfilters is not None:
            fontbox.setFontFilters(fontfilters)

        sizelabel = QLabel("  "+_("Size"))
        sizebox = QSpinBox()
        sizebox.setRange(7, 100)
        self.fontboxes[(fontbox, sizebox)] = option
        layout = QHBoxLayout()

        for subwidget in (fontlabel, fontbox, sizelabel, sizebox):
            layout.addWidget(subwidget)
        layout.addStretch(1)

        widget = QWidget(self)
        widget.fontlabel = fontlabel
        widget.sizelabel = sizelabel        
        widget.fontbox = fontbox
        widget.sizebox = sizebox
        widget.setLayout(layout)

        if not without_group:
            if text is None:
                text = _("Font style")

            group = QGroupBox(text)
            group.setLayout(layout)

            if tip is not None:
                group.setToolTip(tip)

            return group
        else:
            return widget
Option=None -> setting plugin font