React +TS实现拖拽列表

在React和TypeScript中实现一个简单的拖拽列表，你可以使用react-beautiful-dnd库。以下是一个简单的实现例子：

首先，安装react-beautiful-dnd：

npm install react-beautiful-dnd

然后，你可以创建一个简单的拖拽列表组件：

import React, { useState } from 'react';
import { DragDropContext, Droppable, Draggable } from 'react-beautiful-dnd';
 
const reorder = (list: any[], startIndex: number, endIndex: number) => {
  const result = Array.from(list);
  const [removed] = result.splice(startIndex, 1);
  result.splice(endIndex, 0, removed);
  return result;
};
 
const DraggableList: React.FC = () => {
  const [items, setItems] = useState([
    { id: '1', content: 'Item 1' },
    { id: '2', content: 'Item 2' },
    { id: '3', content: 'Item 3' },
    // ...
  ]);
 
  const onDragEnd = (result: any) => {
    if (!result.destination) return;
    const itemsCopy = [...items];
    const reordered = reorder(
      itemsCopy,
      result.source.index,
      result.destination.index
    );
    setItems(reordered);
  };
 
  return (
    <DragDropContext onDragEnd={onDragEnd}>
      <Droppable droppableId="droppable">
        {(provided) => (
          <div {...provided.droppableProps} ref={provided.innerRef}>
            {items.map((item: any, index: number) => (
              <Draggable key={item.id} draggableId={item.id} index={index}>
                {(provided) => (
                  <div
                    ref={provided.innerRef}
                    {...provided.draggableProps}
                    {...provided.dragHandleProps}
                  >
                    {item.content}
                  </div>
                )}
              </Draggable>
            ))}
            {provided.placeholder}
          </div>
        )}
      </Droppable>
    </DragDropContext>
  );
};
 
export default DraggableList;

在这个例子中，DragDropContext提供了拖拽操作所需的上下文，Droppable是一个可以放置Draggable项的区域，Draggable是可拖动的列表项。reorder函数用于重新排列列表项。当拖动结束时，onDragEnd会根据拖动的结果重新排列状态中的items数组。