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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" The default tree content provider. """
from .tree_content_provider import TreeContentProvider
from .tree_item import TreeItem
class DefaultTreeContentProvider(TreeContentProvider):
""" The default tree content provider. """
# ------------------------------------------------------------------------
# 'TreeContentProvider' interface.
# ------------------------------------------------------------------------
def get_parent(self, item):
""" Returns the parent of an item. """
return item.parent
def get_children(self, item):
""" Returns the children of an item. """
return item.children
def has_children(self, item):
""" True iff the item has children. """
return item.has_children
# ------------------------------------------------------------------------
# 'DefaultTreeContentProvider' interface.
# ------------------------------------------------------------------------
def append(self, parent, child):
""" Appends 'child' to the 'parent' item. """
return self.insert(parent, len(parent.children), child)
def insert_before(self, parent, before, child):
""" Inserts 'child' into 'parent' item before 'before'. """
index, child = parent.insert_before(before, child)
return (index, child)
def insert(self, parent, index, child):
""" Inserts 'child' into the 'parent' item at 'index'. """
parent.insert(index, child)
return child
def remove(self, parent, child):
""" Removes 'child' from the 'parent' item. """
parent.remove(child)
return child
# ------------------------------------------------------------------------
# Protected interface.
# ------------------------------------------------------------------------
def _create_item(self, **kw):
""" Creates a new item. """
return TreeItem(**kw)
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