tabs.py 文件源码

def can_be_closed(self):
        """
        This overrides :meth:`Tab.can_be_closed` in order to display a
        save dialog.

        If the file has been saved, this returns True and the tab is
        closed normally. Otherwise this method asks the user whether the
        file should be saved, and returns False only if the user cancels
        something (and thus wants to keep working on this file).
        """
        if self.is_saved():
            return True

        if self.path is None:
            msg = "Do you want to save your changes?"
        else:
            msg = ("Do you want to save your changes to %s?"
                   % os.path.basename(self.path))
        answer = messagebox.askyesnocancel("Close file", msg)
        if answer is None:
            # cancel
            return False
        if answer:
            # yes
            return self.save()
        # no was clicked, can be closed
        return True

    # TODO: document the overriding