<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _set_focused_item(self, item):
 """ Sets the focus to the passed item"""

        if not item:
            return self._del_focused_item()

        if item.model is not self._selection.focus:
            self.queue_draw_item(self._focused_item, item)
            self._selection.focus = item.model
            self.emit('focus-changed', item)