react-beautiful-dnd 实现组件拖拽

一个React.js 的 漂亮,可移植性 列表拖拽库。想了解更多react-beautiful-dnd特点适用人群请看官方文档、中文翻译文档

npm：https://www.npmjs.com/package/react-beautiful-dnd

1.安装

​ 在已有react项目中 执行以下命令 so easy。

# yarn
yarn add react-beautiful-dnd

# npm
npm install react-beautiful-dnd --save

2.APi

详情查看 官方文档。

3.react-beautiful-dnd demo

3.1 demo1 纵向组件拖拽

效果下图：

demo1.gif

实现代码：

import React, { Component } from "react";
import { DragDropContext, Droppable, Draggable } from "react-beautiful-dnd";

//初始化数据
const getItems = count =>
  Array.from({ length: count }, (v, k) => k).map(k => ({
    id: `item-${k + 1}`,
    content: `this is content ${k + 1}`
  }));

// 重新记录数组顺序
const reorder = (list, startIndex, endIndex) => {
  const result = Array.from(list);

  const [removed] = result.splice(startIndex, 1);

  result.splice(endIndex, 0, removed);
  return result;
};

const grid = 8;

// 设置样式
const getItemStyle = (isDragging, draggableStyle) => ({
  // some basic styles to make the items look a bit nicer
  userSelect: "none",
  padding: grid * 2,
  margin: `0 0 ${grid}px 0`,

  // 拖拽的时候背景变化
  background: isDragging ? "lightgreen" : "#ffffff",

  // styles we need to apply on draggables
  ...draggableStyle
});

const getListStyle = () => ({
  background: 'black',
  padding: grid,
  width: 250
});

export default class ReactBeautifulDnd extends Component {
  constructor(props) {
    super(props);
    this.state = {
      items: getItems(11)
    };
    this.onDragEnd = this.onDragEnd.bind(this);
  }

  onDragEnd(result) {
    if (!result.destination) {
      return;
    }

    const items = reorder(
      this.state.items,
      result.source.index,
      result.destination.index
    );

    this.setState({
      items
    });
  }

  render() {
    return (
      <DragDropContext onDragEnd={this.onDragEnd}>
        <center>
          <Droppable droppableId="droppable">
            {(provided, snapshot) => (
              <div
              //provided.droppableProps应用的相同元素.
                {...provided.droppableProps}
                // 为了使 droppable 能够正常工作必须 绑定到最高可能的DOM节点中provided.innerRef.
                ref={provided.innerRef}
                style={getListStyle(snapshot)}
              >
                {this.state.items.map((item, index) => (
                  <Draggable key={item.id} draggableId={item.id} index={index}>
                    {(provided, snapshot) => (
                      <div
                        ref={provided.innerRef}
                        {...provided.draggableProps}
                        {...provided.dragHandleProps}
                        style={getItemStyle(
                          snapshot.isDragging,
                          provided.draggableProps.style
                        )}
                      >
                        {item.content}
                      </div>
                    )}
                  </Draggable>
                ))}
                {provided.placeholder}
              </div>
            )}
          </Droppable>
        </center>
      </DragDropContext>
    );
  }
}

3.2 demo2 水平拖拽

​ 效果下图：

demo2.gif

实现代码： 其实和纵向拖拽差不多 Droppable 中 多添加了一个排列顺序的属性，direction="horizontal"

import React, { Component } from "react";
import { DragDropContext, Droppable, Draggable } from "react-beautiful-dnd";

const getItems = count => (
  Array.from({ length: count }, (v, k) => k).map(k => ({
    id: `item-${k + 1}`,
    content: `this is content ${k + 1}`
  }))
)

// 重新记录数组顺序
const reorder = (list, startIndex, endIndex) => {
  const result = Array.from(list);
  //删除并记录 删除元素
  const [removed] = result.splice(startIndex, 1);
  //将原来的元素添加进数组
  result.splice(endIndex, 0, removed);
  return result;
};

const grid = 8;

// 设置样式
const getItemStyle = (isDragging, draggableStyle) => ({
  // some basic styles to make the items look a bit nicer
  userSelect: "none",
  padding: grid * 2,
  margin: `0 ${grid}px 0 0 `,

  // 拖拽的时候背景变化
  background: isDragging ? "lightgreen" : "#ffffff",

  // styles we need to apply on draggables
  ...draggableStyle
});

const getListStyle = () => ({
  background: 'black',
  display: 'flex',
  padding: grid,
  overflow: 'auto',
});

class ReactBeautifulDndHorizontal extends Component {
  constructor(props) {
    super(props);
    this.state = {
      items: getItems(10)
    };
    this.onDragEnd = this.onDragEnd.bind(this);
  }

  onDragEnd(result) {
    if (!result.destination) {
      return;
    }

    const items = reorder(
      this.state.items,
      result.source.index,
      result.destination.index
    );

    this.setState({
      items
    });
  }

  render() {
    return (
      <DragDropContext onDragEnd={this.onDragEnd}>
        <Droppable droppableId="droppable" direction="horizontal">
          {(provided, snapshot) => (
            <div
              {...provided.droppableProps}
              ref={provided.innerRef}
              style={getListStyle(snapshot.isDraggingOver)}
            >
              {this.state.items.map((item, index) => (
                <Draggable key={item.id} draggableId={item.id} index={index}>
                  {(provided, snapshot) => (
                    <div
                      ref={provided.innerRef}
                      {...provided.draggableProps}
                      {...provided.dragHandleProps}
                      style={getItemStyle(
                        snapshot.isDragging,
                        provided.draggableProps.style
                      )}
                    >
                      {item.content}
                    </div>
                  )}
                </Draggable>
              ))}
              {provided.placeholder}
            </div>
          )}
        </Droppable>
      </DragDropContext>
    )
  }
}

export default ReactBeautifulDndHorizontal

3.3 demo3实现一个代办事项的拖拽（纵向 横向拖拽）

demo3.gif

实现原理其实大同小异 。代码整理后放在github上。地址：github

4.感受

目前简单的使用react - beautiful-dnd下来感觉 ，上手感觉挺简单，api也不繁琐。性能也不错（demo2中做过渲染170多个task。拖拽起来还是如丝般顺滑）。日后遇到啥不足会mark在一下。

到此这篇关于react-beautiful-dnd 实现组件拖拽的文章就介绍到这了,更多相关react-beautiful-dnd 组件拖拽内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们！