@wordpress/components/build-module/drop-zone/index.js

UI components for WordPress.

import { createElement } from "@wordpress/element";

/**
 * External dependencies
 */
import classnames from 'classnames';
import { includes } from 'lodash';
/**
 * WordPress dependencies
 */

import { __ } from '@wordpress/i18n';
import { useState } from '@wordpress/element';
import { upload, Icon } from '@wordpress/icons';
import { getFilesFromDataTransfer } from '@wordpress/dom';
import { __experimentalUseDropZone as useDropZone } from '@wordpress/compose';
export default function DropZoneComponent({
  className,
  label,
  onFilesDrop,
  onHTMLDrop,
  onDrop
}) {
  const [isDraggingOverDocument, setIsDraggingOverDocument] = useState();
  const [isDraggingOverElement, setIsDraggingOverElement] = useState();
  const [type, setType] = useState();
  const ref = useDropZone({
    onDrop(event) {
      const files = getFilesFromDataTransfer(event.dataTransfer);
      const html = event.dataTransfer.getData('text/html');

      if (files.length && onFilesDrop) {
        onFilesDrop(files);
      } else if (html && onHTMLDrop) {
        onHTMLDrop(html);
      } else if (onDrop) {
        onDrop(event);
      }
    },

    onDragStart(event) {
      setIsDraggingOverDocument(true);
      let _type = 'default';

      if ( // Check for the types because sometimes the files themselves
      // are only available on drop.
      includes(event.dataTransfer.types, 'Files') || getFilesFromDataTransfer(event.dataTransfer).length > 0) {
        _type = 'file';
      } else if (includes(event.dataTransfer.types, 'text/html')) {
        _type = 'html';
      }

      setType(_type);
    },

    onDragEnd() {
      setIsDraggingOverDocument(false);
      setType();
    },

    onDragEnter() {
      setIsDraggingOverElement(true);
    },

    onDragLeave() {
      setIsDraggingOverElement(false);
    }

  });
  let children;

  if (isDraggingOverElement) {
    children = createElement("div", {
      className: "components-drop-zone__content"
    }, createElement(Icon, {
      icon: upload,
      className: "components-drop-zone__content-icon"
    }), createElement("span", {
      className: "components-drop-zone__content-text"
    }, label ? label : __('Drop files to upload')));
  }

  const classes = classnames('components-drop-zone', className, {
    'is-active': (isDraggingOverDocument || isDraggingOverElement) && (type === 'file' && onFilesDrop || type === 'html' && onHTMLDrop || type === 'default' && onDrop),
    'is-dragging-over-document': isDraggingOverDocument,
    'is-dragging-over-element': isDraggingOverElement,
    [`is-dragging-${type}`]: !!type
  });
  return createElement("div", {
    ref: ref,
    className: classes
  }, children);
}
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