拖动时，react-beautiful-dnd 不会在material-ui-next.com 持久抽屉中显示可拖动项目

Question

我有一个持久抽屉，其中包含一个可拖动项目的可放置列表。该功能是存在的，但是当拖动项目时，被拖动的项目不会显示。我可以完美地拖动项目，并且正在分配空间，包括 dnd 框架预期的动画，我只是看不到我正在拖动的内容。如果我将抽屉更改为永久抽屉，一切都会按预期进行。有什么建议么？

我的组件（在原型代码中）：（DragDropContext 在父组件中声明）

import React from 'react';
import { Divider, Drawer, IconButton, List, ListItem, Paper, 
withStyles } from 'material-ui';
import { Draggable, Droppable } from 'react-beautiful-dnd';

const styles = {
  list: {
    width: 250,
    marginTop: 70
  },
};

const getItemStyle = (isDragging, draggableStyle) => ({
  // some basic styles to make the items look a bit nicer
  userSelect: 'none',
  padding: 8 * 2,
  margin: `0 0 8px 0`,

  // change background colour if dragging
  background: isDragging ? 'lightgreen' : 'red',

  // styles we need to apply on draggables
      ...draggableStyle,

});

const getListStyle = isDraggingOver => ({
  background: isDraggingOver ? 'lightblue' : 'none',
  padding: 8,
  width: 250,
});

class WidgetDrawer extends React.Component {

  state = { items: [{ id: 1, content: 'Widget A'}, { id: 2, content: 'Widget B'}]};

  renderWidgets() {
    const widgets = [{
      name: 'Widget A'
    }, {
      name: 'Widget B'
    }];

    return widgets.map((widget, index) => {
      return <Draggable key={widget.name} draggableId={widget.name} index={index}>
                  {(provided, snapshot) => (
                    <div>
                      <div
                        ref={provided.innerRef}
                        {...provided.draggableProps}
                        {...provided.dragHandleProps}
                        style={getItemStyle(
                          snapshot.isDragging,
                          provided.draggableProps.style
                        )}
                      >
                        <ListItem>
                          <Paper>
                            {widget.name}
                          </Paper>
                        </ListItem>
                      </div>
                      {provided.placeholder}
                    </div>
                  )}
                </Draggable>
    })
  }

  render() {

    const { classes } = this.props;

    const fullList = (
      <div className={classes.list}>
          <Droppable droppableId="droppable">
          {(provided, snapshot) => (
            <div
              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>
                      <div
                        ref={provided.innerRef}
                        {...provided.draggableProps}
                        {...provided.dragHandleProps}
                        style={getItemStyle(
                          snapshot.isDragging,
                          provided.draggableProps.style
                        )}
                      >
                        {item.content}
                      </div>
                      {provided.placeholder}
                    </div>
                  )}
                </Draggable>
              ))}
              {provided.placeholder}
            </div>
          )}
        </Droppable>
      </div>
    );

    return (
     <Drawer
       variant='permanent'
       anchor="right"
       open={this.props.open}
       onClose={this.props.toggleDrawer}>
      <div
        tabIndex={0}
        role="button"
        onClick={this.props.toggleDrawer}
        onKeyDown={this.props.toggleDrawer}
      >
        {fullList}
      </div>
    </Drawer>
    )
  }
}

export default withStyles(styles)(WidgetDrawer);

Answer 1

这可以通过覆盖中提供的道具来修复

const getItemStyle = (isDragging, draggableStyle) => ({
  ...draggableStyle,
  userSelect: 'none',
  position:static,
  padding: 8 * 2,
  margin: `0 0 8px 0`,
  background: isDragging ? 'lightgreen' : 'red',    
});

Answer 2

对于其他为此苦苦挣扎的人。这很可能是因为您的父元素上有一个转换集。即使它是零变换，它也会扰乱固定子项上的变换。因此，唯一已知的解决方案是删除父级上的变换（或将其设置为“无”）。

或者您可以尝试使用反应门户来寻找替代解决方案。

https://github.com/atlassian/react-beautiful-dnd/issues/128