记录拖动排序

最近项目中要做一个拖动排序功能，首先想到的是之前项目中用过的antd自带的tree和table的拖动排序，但是只能在对应的组建里使用。这里用的是自定义组件，随意拖动排序，所以记录一下实现流程

1. react-dnd antd组件的拖动排序都是用的这个库，使用比较灵活，但是要配置的东西比较多，需求复杂时使用这个库；

   class BodyRow extends React.Component {
     render() {
       const { isOver, connectDragSource, connectDropTarget, moveRow, ...restProps } = this.props;
       const style = { ...restProps.style, cursor: 'move' };
   
       let { className } = restProps;
       if (isOver) {
         if (restProps.index > dragingIndex) {
           className += ' drop-over-downward';
         }
         if (restProps.index < dragingIndex) {
           className += ' drop-over-upward';
         }
       }
       return connectDragSource(
         connectDropTarget(<tr {...restProps} className={className} style={style} />),
       );
     }
   }
   const rowSource = {
     beginDrag(props) {
       dragingIndex = props.index;
       return {
         index: props.index,
       };
     },
   };
   const rowTarget = {
     drop(props, monitor) {
       const dragIndex = monitor.getItem().index;
       const hoverIndex = props.index;
       // Don't replace items with themselves
       if (dragIndex === hoverIndex) {
         return;
       }
       // Time to actually perform the action
       props.moveRow(dragIndex, hoverIndex);
       // Note: we're mutating the monitor item here!
       // Generally it's better to avoid mutations,
       // but it's good here for the sake of performance
       // to avoid expensive index searches.
       monitor.getItem().index = hoverIndex;
     },
   };
   const DragableBodyRow = DropTarget('row', rowTarget, (connect, monitor) => ({
     connectDropTarget: connect.dropTarget(),
     isOver: monitor.isOver(),
   }))(
     DragSource('row', rowSource, connect => ({
       connectDragSource: connect.dragSource(),
     }))(BodyRow),
   );
   
   <DndProvider backend={HTML5Backend}>
     <Table
       columns={columns}
       dataSource={this.state.data}
       components={this.components}
       onRow={(record, index) => ({
         index,
         moveRow: this.moveRow,
       })}
     />
   </DndProvider>
   

2. react-beautiful-dnd 在项目中看到引用了这个库，使用起来也不算复杂，就试着用了这个库，不过只支持水平或垂直拖动，一行或者一列元素时可以使用，可惜这个需求时两行多列元素，也没办法用；

   <DragDropContext onDragEnd={this.onDragEnd}>
     <Droppable droppableId='phone-droppable'>
       {droppableProvided => (
         <div ref={droppableProvided.innerRef} {...droppableProvided.droppableProps}>
           {this.state.phoneImages.map((image, index) => (
             <Draggable key={image||'upload'} draggableId={image||'upload'} index={index}>
               {(provided, snapshot) => (
                 <div
                   ref={provided.innerRef}
                   {...provided.draggableProps}
                   {...provided.dragHandleProps}
                   style={{
                     ...provided.draggableProps.style,
                     opacity: snapshot.isDragging ? 0.8 : 1,
                     display: 'inline-block'
                   }}
                 >
                   <img src={img}/>
                 </div>
               )}
             </Draggable>
           ))}
           {droppableProvided.placeholder}
         </div>
       )}
     </Droppable>
   </DragDropContext>
   

3. react-sortable-hoc 最后在网上搜索的时候，又看到这个库，使用起来比较简单，使用SortableList包裹要拖拽元素的容器，SortableElement包裹要拖拽的子元素，设置容器拖拽方向axis={'xy'}即可使grid布局的多个元素支持水平和竖直方向拖动排序；

   const SortableItem = SortableElement(({children}) => (
     <div>{children}</div>
   ));
   const SortableList = SortableContainer(({children}) => {
     return (
       <div style={{display: 'grid', gridTemplateRows: '117px 117px', gridTemplateColumns: '120px 120px 120px 120px'}}>
         {children}
       </div>
     );
   });
   
   <SortableList onSortEnd={this.onPadSortEnd} helperClass={Styles.sortableHelper} axis={'xy'}>
     {this.state.padImages.map((image, index) => (
       <SortableItem key={`pad-item-${index}`} index={index} className={Styles.sortableItem}>
         <img src={img}/>
       </SortableItem>
     ))}
   </SortableList>
   

好久没更新博客了，最近工作比较忙，差不多每天都要加班，中间有经历搬家，没时间坐下来总结学到的东西。工作的时候因为这块花费了一些时间，想到可能别人也会遇到类似问题，所以就记录下来了

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