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

Generic block editor.

import _extends from "@babel/runtime/helpers/esm/extends";
import { createElement } from "@wordpress/element";

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

import { useMergeRefs } from '@wordpress/compose';
import { Popover } from '@wordpress/components';
import { forwardRef, useMemo, useReducer, useLayoutEffect } from '@wordpress/element';
/**
 * Internal dependencies
 */

import { __unstableUseBlockElement as useBlockElement } from '../block-list/use-block-props/use-block-refs';
import usePopoverScroll from './use-popover-scroll';
const MAX_POPOVER_RECOMPUTE_COUNTER = Number.MAX_SAFE_INTEGER;

function BlockPopover({
  clientId,
  bottomClientId,
  children,
  __unstableRefreshSize,
  __unstableCoverTarget = false,
  __unstablePopoverSlot,
  __unstableContentRef,
  shift = true,
  ...props
}, ref) {
  const selectedElement = useBlockElement(clientId);
  const lastSelectedElement = useBlockElement(bottomClientId !== null && bottomClientId !== void 0 ? bottomClientId : clientId);
  const mergedRefs = useMergeRefs([ref, usePopoverScroll(__unstableContentRef)]);
  const [popoverDimensionsRecomputeCounter, forceRecomputePopoverDimensions] = useReducer( // Module is there to make sure that the counter doesn't overflow.
  s => (s + 1) % MAX_POPOVER_RECOMPUTE_COUNTER, 0); // When blocks are moved up/down, they are animated to their new position by
  // updating the `transform` property manually (i.e. without using CSS
  // transitions or animations). The animation, which can also scroll the block
  // editor, can sometimes cause the position of the Popover to get out of sync.
  // A MutationObserver is therefore used to make sure that changes to the
  // selectedElement's attribute (i.e. `transform`) can be tracked and used to
  // trigger the Popover to rerender.

  useLayoutEffect(() => {
    if (!selectedElement) {
      return;
    }

    const observer = new window.MutationObserver(forceRecomputePopoverDimensions);
    observer.observe(selectedElement, {
      attributes: true
    });
    return () => {
      observer.disconnect();
    };
  }, [selectedElement]);
  const style = useMemo(() => {
    if ( // popoverDimensionsRecomputeCounter is by definition always equal or greater
    // than 0. This check is only there to satisfy the correctness of the
    // exhaustive-deps rule for the `useMemo` hook.
    popoverDimensionsRecomputeCounter < 0 || !selectedElement || lastSelectedElement !== selectedElement) {
      return {};
    }

    return {
      position: 'absolute',
      width: selectedElement.offsetWidth,
      height: selectedElement.offsetHeight
    };
  }, [selectedElement, lastSelectedElement, __unstableRefreshSize, popoverDimensionsRecomputeCounter]);
  const popoverAnchor = useMemo(() => {
    if ( // popoverDimensionsRecomputeCounter is by definition always equal or greater
    // than 0. This check is only there to satisfy the correctness of the
    // exhaustive-deps rule for the `useMemo` hook.
    popoverDimensionsRecomputeCounter < 0 || !selectedElement || bottomClientId && !lastSelectedElement) {
      return undefined;
    }

    return {
      getBoundingClientRect() {
        var _lastSelectedBCR$left, _lastSelectedBCR$top, _lastSelectedBCR$righ, _lastSelectedBCR$bott;

        const selectedBCR = selectedElement.getBoundingClientRect();
        const lastSelectedBCR = lastSelectedElement?.getBoundingClientRect(); // Get the biggest rectangle that encompasses completely the currently
        // selected element and the last selected element:
        // - for top/left coordinates, use the smaller numbers
        // - for the bottom/right coordinates, use the largest numbers

        const left = Math.min(selectedBCR.left, (_lastSelectedBCR$left = lastSelectedBCR?.left) !== null && _lastSelectedBCR$left !== void 0 ? _lastSelectedBCR$left : Infinity);
        const top = Math.min(selectedBCR.top, (_lastSelectedBCR$top = lastSelectedBCR?.top) !== null && _lastSelectedBCR$top !== void 0 ? _lastSelectedBCR$top : Infinity);
        const right = Math.max(selectedBCR.right, (_lastSelectedBCR$righ = lastSelectedBCR.right) !== null && _lastSelectedBCR$righ !== void 0 ? _lastSelectedBCR$righ : -Infinity);
        const bottom = Math.max(selectedBCR.bottom, (_lastSelectedBCR$bott = lastSelectedBCR.bottom) !== null && _lastSelectedBCR$bott !== void 0 ? _lastSelectedBCR$bott : -Infinity);
        const width = right - left;
        const height = bottom - top;
        return new window.DOMRect(left, top, width, height);
      },

      ownerDocument: selectedElement.ownerDocument
    };
  }, [bottomClientId, lastSelectedElement, selectedElement, popoverDimensionsRecomputeCounter]);

  if (!selectedElement || bottomClientId && !lastSelectedElement) {
    return null;
  }

  return createElement(Popover, _extends({
    ref: mergedRefs,
    animate: false,
    focusOnMount: false,
    anchor: popoverAnchor // Render in the old slot if needed for backward compatibility,
    // otherwise render in place (not in the default popover slot).
    ,
    __unstableSlotName: __unstablePopoverSlot || null,
    placement: "top-start",
    resize: false,
    flip: false,
    shift: shift
  }, props, {
    className: classnames('block-editor-block-popover', props.className),
    variant: "unstyled"
  }), __unstableCoverTarget && createElement("div", {
    style: style
  }, children), !__unstableCoverTarget && children);
}

export default forwardRef(BlockPopover);
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