@wordpress/block-editor/build-module/components/block-list/index.js

Generic block editor.

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

/**
 * External dependencies
 */
import classnames from 'classnames';
/**
 * WordPress dependencies
 */

import { AsyncModeProvider, useSelect, useDispatch, useRegistry } from '@wordpress/data';
import { useViewportMatch, useMergeRefs, useDebounce } from '@wordpress/compose';
import { createContext, useState, useMemo, useCallback } from '@wordpress/element';
/**
 * Internal dependencies
 */

import BlockListBlock from './block';
import BlockListAppender from '../block-list-appender';
import { useInBetweenInserter } from './use-in-between-inserter';
import { store as blockEditorStore } from '../../store';
import { usePreParsePatterns } from '../../utils/pre-parse-patterns';
import { LayoutProvider, defaultLayout } from './layout';
import BlockToolsBackCompat from '../block-tools/back-compat';
import { useBlockSelectionClearer } from '../block-selection-clearer';
import { useInnerBlocksProps } from '../inner-blocks';
import { BlockEditContextProvider, DEFAULT_BLOCK_EDIT_CONTEXT } from '../block-edit/context';
const elementContext = createContext();
export const IntersectionObserver = createContext();
const pendingBlockVisibilityUpdatesPerRegistry = new WeakMap();

function Root({
  className,
  ...settings
}) {
  const [element, setElement] = useState();
  const isLargeViewport = useViewportMatch('medium');
  const {
    isOutlineMode,
    isFocusMode,
    editorMode
  } = useSelect(select => {
    const {
      getSettings,
      __unstableGetEditorMode
    } = select(blockEditorStore);
    const {
      outlineMode,
      focusMode
    } = getSettings();
    return {
      isOutlineMode: outlineMode,
      isFocusMode: focusMode,
      editorMode: __unstableGetEditorMode()
    };
  }, []);
  const registry = useRegistry();
  const {
    setBlockVisibility
  } = useDispatch(blockEditorStore);
  const delayedBlockVisibilityUpdates = useDebounce(useCallback(() => {
    const updates = {};
    pendingBlockVisibilityUpdatesPerRegistry.get(registry).forEach(([id, isIntersecting]) => {
      updates[id] = isIntersecting;
    });
    setBlockVisibility(updates);
  }, [registry]), 300, {
    trailing: true
  });
  const intersectionObserver = useMemo(() => {
    const {
      IntersectionObserver: Observer
    } = window;

    if (!Observer) {
      return;
    }

    return new Observer(entries => {
      if (!pendingBlockVisibilityUpdatesPerRegistry.get(registry)) {
        pendingBlockVisibilityUpdatesPerRegistry.set(registry, []);
      }

      for (const entry of entries) {
        const clientId = entry.target.getAttribute('data-block');
        pendingBlockVisibilityUpdatesPerRegistry.get(registry).push([clientId, entry.isIntersecting]);
      }

      delayedBlockVisibilityUpdates();
    });
  }, []);
  const innerBlocksProps = useInnerBlocksProps({
    ref: useMergeRefs([useBlockSelectionClearer(), useInBetweenInserter(), setElement]),
    className: classnames('is-root-container', className, {
      'is-outline-mode': isOutlineMode,
      'is-focus-mode': isFocusMode && isLargeViewport,
      'is-navigate-mode': editorMode === 'navigation'
    })
  }, settings);
  return createElement(elementContext.Provider, {
    value: element
  }, createElement(IntersectionObserver.Provider, {
    value: intersectionObserver
  }, createElement("div", innerBlocksProps)));
}

export default function BlockList(settings) {
  usePreParsePatterns();
  return createElement(BlockToolsBackCompat, null, createElement(BlockEditContextProvider, {
    value: DEFAULT_BLOCK_EDIT_CONTEXT
  }, createElement(Root, settings)));
}
BlockList.__unstableElementContext = elementContext;

function Items({
  placeholder,
  rootClientId,
  renderAppender,
  __experimentalAppenderTagName,
  __experimentalLayout: layout = defaultLayout
}) {
  const {
    order,
    selectedBlocks,
    visibleBlocks
  } = useSelect(select => {
    const {
      getBlockOrder,
      getSelectedBlockClientIds,
      __unstableGetVisibleBlocks
    } = select(blockEditorStore);
    return {
      order: getBlockOrder(rootClientId),
      selectedBlocks: getSelectedBlockClientIds(),
      visibleBlocks: __unstableGetVisibleBlocks()
    };
  }, [rootClientId]);
  return createElement(LayoutProvider, {
    value: layout
  }, order.map(clientId => createElement(AsyncModeProvider, {
    key: clientId,
    value: // Only provide data asynchronously if the block is
    // not visible and not selected.
    !visibleBlocks.has(clientId) && !selectedBlocks.includes(clientId)
  }, createElement(BlockListBlock, {
    rootClientId: rootClientId,
    clientId: clientId
  }))), order.length < 1 && placeholder, createElement(BlockListAppender, {
    tagName: __experimentalAppenderTagName,
    rootClientId: rootClientId,
    renderAppender: renderAppender
  }));
}

export function BlockListItems(props) {
  // This component needs to always be synchronous as it's the one changing
  // the async mode depending on the block selection.
  return createElement(AsyncModeProvider, {
    value: false
  }, createElement(Items, props));
}
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