Tree widget module for rendering hierarchical data.

This module provides an interactive tree widget that handles keyboard events for navigation, expansion, and selection.

Usage

Basic tree:

{tree, [{id, my_tree}, {nodes, [
    {"Root", [
        {"Child 1", []},
        {"Child 2", [
            {"Grandchild", []}
        ]}
    ]}
]}]}

Properties

• nodes (list): The tree structure.
• expanded_ids (list): IDs of nodes that are currently expanded.
• selected_index (integer): The index of the currently selected visible item.
• scroll_offset (integer): The index of the first item to display.