tabs.py 文件源码

def insert(self, title, widget=None, position=-1, focus=True):
        """Insert new tab

        title: Any flow or fixed widget to use as the tab's title
        widget: Widget to show when this tab is selected or None
        position: Where to insert the new tab; int for list-like index or
                  'right'/'left' to insert next to focused tab
        focus: True to focus the new tab, False otherwise

        Return TabID of inserted tab
        """
        curpos = self.focus_position
        if position == 'right':
            newpos = (curpos+1) if curpos is not None else 0
        elif position == 'left':
            newpos = max(curpos, 0) if curpos is not None else 0
        elif isinstance(position, int):
            if position < 0:
                newpos = position + len(self._contents) + 1
            else:
                newpos = position
        else:
            raise ValueError('Invalid position: {!r}'.format(position))

        # Insert new tab ID
        this_id = _find_unused_id(self._ids)
        self._ids.insert(newpos, this_id)

        # Insert title
        self._tabbar.base_widget.insert(newpos, title)

        # Insert content
        self._contents.insert(newpos, widget)
        if focus:
            self.focus_position = newpos
        return this_id