tree_view_with_drag_and_drop library

A Flutter package that provides a customizable tree view with drag-and-drop support.

This package allows you to display hierarchical data in a tree structure with the ability to reorder nodes via intuitive drag-and-drop interactions.

Features

• Generic Data Support: Use any data type with TreeNode<T>
• Drag & Drop: Reorder nodes by dragging and dropping
• Customizable: Customize appearance and behavior
• Expand/Collapse: Show or hide child nodes
• Controller: Programmatically control the tree

Usage

import 'package:tree_view_with_drag_and_drop/flutter_tree_drag_drop.dart';

// Create tree nodes
final nodes = [
  TreeNode<String>(
    id: '1',
    data: 'Parent',
    children: [
      TreeNode<String>(id: '1.1', data: 'Child 1'),
      TreeNode<String>(id: '1.2', data: 'Child 2'),
    ],
  ),
];

// Use in a widget
TreeView<String>(
  nodes: nodes,
  itemBuilder: (context, node, isExpanded) {
    return ListTile(
      title: Text(node.data),
      leading: Icon(node.hasChildren ? Icons.folder : Icons.file),
      onTap: node.hasChildren
          ? () {
              node.isExpanded = !node.isExpanded;
            }
          : null,
    );
  },
  onReorder: (draggedNode, targetNode, position) {
    print('Node ${draggedNode.id} moved to ${position} of ${targetNode.id}');
  },
)

Classes

DraggableTreeItem<T>

A draggable and droppable tree item widget.

TreeItemConfig

Configuration for the tree item appearance

TreeNode<T>

A node in the tree structure that can hold custom data of any type.

TreeView<T>

A customizable tree view widget with drag-and-drop support.

TreeViewController<T>

Controller for programmatically manipulating the tree view

Enums

DropPosition

Represents the position where a dragged node can be dropped relative to the target node.