Rearranging Items

A node (and its descendants, if any) can be moved to a different location in the tree. The only restriction is that a node cannot be moved underneath one of its descendants for obvious reasons. As before, the target location is specified via a parent node and a position within its list of children.

#![allow(unused)]
fn main() {
// move widgets under gallery
tree.move_item( "widgets", "gallery", Index::End )?;
}

Items can be detached from the tree. This removes the item and its descendants from the hierarchy but does not destroy the items. This allows us to later reinsert them with move_item.

Items can also be deleted, which does completely destroy the item and its descendants.

#![allow(unused)]
fn main() {
tree.delete( &[ "widgets" ])?;
}

To traverse the hierarchy, there are methods to find the parent of an item (parent_item), its next or previous sibling (next_item and prev_item), and return the list of children of an item.

We can control whether or not the item is open and shows its children by modifying the open item configuration option.

#![allow(unused)]
fn main() {
tree.set_item( "widgets", -open("true") )?;
let is_open = tree.item( "widgets", open )?;
}

Run Example

cargo run --example rearranging_items