README.md

dnd-kit-sortable-tree

This is a Tree component extracted from dndkit examples and abstracted a bit. Here's how it could look like (visuals are completely customizable via css though)

Play around in examples to check the API and see what it can do.

Install

npm install dnd-kit-sortable-tree @dnd-kit/core @dnd-kit/sortable @dnd-kit/utilities

How-to use

Check out the Storybook for code samples and play around. You could also play with it on playcode

Shortly, you need to render:

<SortableTree
  items={/* array of your tree items */}
  onItemsChanged={/* callback when items are reordered */}
  TreeItemComponent={/* component that renders a single tree item */}
/>

And TreeItemComponent is usually your data wrapped in SimpleTreeItemWrapper or FolderTreeItemWrapper:

React.forwardRef((props, ref) => (
  <SimpleTreeItemWrapper {...props} ref={ref}>
    <div>{props.item.value}</div>
  </SimpleTreeItemWrapper>
));

Note that wrapping in forwardRef and passing ref to SimpleTreeItemWrapper is very important!

Examples

1. Here's the very minimal code to add a Sortable Tree. You shouldn't use it as is in your project, but it could be easier to grasp what's going on.

   export const Minimal = () => {
     const [items, setItems] = useState(initialMinimalData);
     return (
       <SortableTree
         items={items}
         onItemsChanged={setItems}
         {
           /*
            * You need to pass the component rendering a single item via TreeItemComponent props.
            * This component will receive the data via `props.item`.
            * In this example we inline the component, but in reality you should extract it into a const.
            */ ...{}
         }
         TreeItemComponent={React.forwardRef((props, ref) => (
           <SimpleTreeItemWrapper {...props} ref={ref}>
             {/* HERE GOES THE ACTUAL CONTENT OF YOUR COMPONENT */}
             <div>{props.item.id}</div>
           </SimpleTreeItemWrapper>
         ))}
       />
     );
   };
   /*
    * Configure the tree data.
    */
   const initialMinimalData = [
     { id: '1', children: [{ id: '4' }, { id: '5' }] },
     { id: '2' },
     { id: '3' },
   ];

2. Here's the minimal viable example that you could potentially copy&paste to your project to start from.

   export const MinimalViable = () => {
     const [items, setItems] = useState(initialViableMinimalData);
     return (
       <SortableTree
         items={items}
         onItemsChanged={setItems}
         TreeItemComponent={MinimalTreeItemComponent}
       />
     );
   };
   type MinimalTreeItemData = {
     value: string;
   };
   /*
    * Here's the component that will render a single row of your tree
    */
   const MinimalTreeItemComponent = React.forwardRef<
     HTMLDivElement,
     TreeItemComponentProps<MinimalTreeItemData>
   >((props, ref) => (
     /* you could also use FolderTreeItemWrapper if you want to show vertical lines.  */
     <SimpleTreeItemWrapper {...props} ref={ref}>
       <div>{props.item.value}</div>
     </SimpleTreeItemWrapper>
   ));
   
   /*
    * Configure the tree data.
    */
   const initialViableMinimalData: TreeItems<MinimalTreeItemData> = [
     {
       id: '1',
       value: 'Jane',
       children: [
         { id: '4', value: 'John' },
         { id: '5', value: 'Sally' },
       ],
     },
     { id: '2', value: 'Fred', children: [{ id: '6', value: 'Eugene' }] },
     { id: '3', value: 'Helen', canHaveChildren: false },
   ];

API

Data configuration (each TreeItem element could define them):

• canHaveChildren - Default: true.

  If set to false, prevents any node from being dragged into the current one.

  Also accepts a function: (dragItem) => bool which could conditionally determine if a certain item could be a children of a node

• disableSorting - Default: false. If set to true, prevents node from being dragged (i.e. it can't be sorted or moved to another node)

Tree configuration (props of <SortableTree>)

• items - mandatory, items shown in a tree

• onItemsChanged - mandatory, callback that is called when dragging of certain item is finished. You should preserve new state and adjust the value of items prop as needed.

• TreeItemComponent - mandatory, component that renders a single tree row.

• indentationWidth - optional, padding used for children

• pointerSensorOptions - optional, configures the condition when item dragging starts. Defaults to:

  {
    "activationConstraint": {
      "distance": 3
    }
  }

• disableSorting - optional, you could set this to true to completely disable the sorting

• keepGhostInPlace - optional, you could set this to true to keep the Node that you are dragging in it's original place in a Tree. Check VSCode sample to see it in action.

• dndContextProps - optional, override any prop of underlying DndContext.

• sortableProps - optional, override any prop that is passed to underlying useSortable hook.

TreeItemWrapper configuration (props of <SimpleTreeItemWrapper> and <FolderTreeItemWrapper>)

• manualDrag - Default: false. Set to true if you want tree item to be draggable ONLY from dragHandle.
• showDragHandle - optional, set to false if you want to hide default dragHandle and show your own instead. Use <div {...props.handleProps}>DRAG_ME</div> for your own drag handle.

FAQ

1. If you want to disable animation completely, you need to do the following:
   1. Pass null as dropAnimation prop (this disables the actual 'drop' animation for the Node that was dragged).
   2. Pass { animateLayoutChanges: () => false } to sortableProps (this disables the animation of all other nodes that were not dragged)

Troubleshooting

1. If your dragged item is shown at the end of a list, make sure you that:
   1. You wrapped your TreeItem component in React.forwardRef and passing the ref to SimpleTreeItemWrapper
   2. You pass the styles prop from TreeItem to SimpleTreeItemWrapper