configurator.py 文件源码

def delete_element(self, tree_id):
        """
        Delete element with Treeview id *tree_id* from the tree, from the element 
        dictionary, and from the associated data structure. Recursively 
        deletes all children of *tree_id*.

        The tree should be refreshed using :py:meth:`refresh_tree` after 
        each deletion. This is the responsibility of the caller.

        """
        #if self.treeview.exists(tree_id):
        if tree_id in self.element_dict:
            # recursively delete children
            if self.element_dict[tree_id].children is not None:
                for child in self.element_dict[tree_id].children:
                    self.delete_element(child.treeview_id)

            # check if deleting the root element
            if self.root_element.treeview_id == tree_id:
                # clear the root element
                self.root_element = None
            else:
                try:
                    # remove the element from its parent's list of children
                    self.element_dict[tree_id].parent.remove_child_id(tree_id)
                except AttributeError:
                    raise AttributeError("Non-root element lacks proper parent")

            # delete the element from the dictionary
            del self.element_dict[tree_id]