1. Example 1 -- Drag animals into the zoo box
2. Example 2 -- Drag between two boxes
3. Example 3 -- Drag list items and change their order between two lists

(https://react-project-03-dnd-playground.vercel.app/)

1. 'react-dnd' a.

   Wrap the area you want to realize drag and drop with 'DndProvider'

    import { DndProvider } from 'react-dnd';
    import { HTML5Backend } from 'react-dnd-html5-backend';
    <DndProvider backend={HTML5Backend}>
        <App />
    </DndProvider>
    ```
   

   b.

   Add Drop feature to component

    import { useDrop } from 'react-dnd';
    const [{ isOver }, drop] = useDrop(() => ({
        accept: 'card',
        collect: (monitor) => ({
            isOver: monitor.isOver() // Detect if the droppable component enter the draggable area
        }),
        drop: (item) => {
            handleDrop(item) // Receive droppable item id
        }
    }), [handleDrop]);
    ```
   

   Add ref to div

    <div ref={drop}>
        ...
    </div>
    ```
   

   c.

   Add drag feature to component

    import { useDrag } from 'react-dnd'
    const [{ isDragging }, drag] = useDrag(() => ({
    type: 'card',
    item: { id },
    collect: (monitor) => ({
        isDragging: monitor.isDragging(),
    })
    }));
    ```
   

   Add ref to div

    <div ref={drag}>
        ...
    </div>
    ```
   

   Main hooks

    isOver
    isDragging
   

2. 'react-beautiful-dnd' a.

   Wrap the area you want to realize drag and drop with 'DndProvider'

    <DragDropContext onDragEnd={handleOnDragEnd}>
        ...
    </DragDropContext>
   

   b.

   Add droppable area

    <Droppable droppableId="type">
        {(provided) => (
            <div 
                className='listContainer' 
                {...provided.droppableProps} 
                ref={provided.innerRef}
            >
                ...
            </div>
        )}
        {provided.placeholder}
    </Droppable>
   

   c.

   Add draggable area

    <Draggable key={id} draggableId={id} index={index}>
        {(provided) => (
            <div
                className='Card'
                {...provided.draggableProps}
                {...provided.dragHandleProps}
                ref={provided.innerRef}
            >
                ...
            </div>
        )}
    </Draggable>
   

   Main hooks

   For onDragStart = () => { /.../ }; onDragUpdate = () => { /.../ } onDragEnd = () => { // the only one that is required // usually include reorder logic and something else };

   For Required: DroppableId

   For Required: key(if map something), draggableId, index

1. (https://github.com/react-dnd/react-dnd)
2. (https://medium.com/nmc-techblog/easy-drag-and-drop-in-react-22778b30ba37)