@atlaskit/editor-plugin-block-controls/dist/es2019/ui/utils/get-surface-placement.js

Block controls plugin for @atlaskit/editor-core

import { shouldBeSticky } from '../../pm-plugins/utils/drag-handle-positions';
import { dragHandleGap, topPositionAdjustment } from '../consts';
export const getAbsoluteSurfacePlacement = ({
  offsetParentRect,
  offsetParentScrollLeft,
  offsetParentScrollTop,
  placement
}) => {
  var _offsetParentRect$lef, _offsetParentRect$top;
  return {
    ...placement,
    left: placement.left - ((_offsetParentRect$lef = offsetParentRect === null || offsetParentRect === void 0 ? void 0 : offsetParentRect.left) !== null && _offsetParentRect$lef !== void 0 ? _offsetParentRect$lef : 0) + offsetParentScrollLeft,
    top: placement.top - ((_offsetParentRect$top = offsetParentRect === null || offsetParentRect === void 0 ? void 0 : offsetParentRect.top) !== null && _offsetParentRect$top !== void 0 ? _offsetParentRect$top : 0) + offsetParentScrollTop
  };
};

/**
 * Positions the surface beside the legacy drag-handle slot, on either the left or right edge
 * of the target node. Node-type-specific gap/top-adjustment maths (layouts, tables, media, cards,
 * extensions, etc.) live in one place so left/right edge cases can't drift out of sync.
 *
 * The left side grows away from the node without knowing its own width, so it needs
 * `translateX(-100%)` to anchor its right edge at `nodeRect.left` and extend backward. The right
 * side grows in the normal box-flow direction (away from the node, into the margin), so the gap
 * can be folded straight into `left` with no transform needed.
 */
export const getSurfacePlacement = ({
  layout,
  nodeRect,
  nodeType,
  nodeTypeWithLevel,
  parentNodeType,
  side
}) => {
  if (nodeType === 'layoutColumn') {
    // nodeRect.left + width/2 === nodeRect.right - width/2 — side-independent.
    return {
      left: nodeRect.left + nodeRect.width / 2,
      top: nodeRect.top,
      transform: 'translate(-50%, -50%)'
    };
  }
  const gap = dragHandleGap(nodeType, parentNodeType);
  const top = nodeRect.top + topPositionAdjustment(nodeTypeWithLevel, layout);
  const height = shouldBeSticky(nodeType) ? nodeRect.height : undefined;
  return side === 'right' ? {
    left: nodeRect.right + gap,
    top,
    transform: '',
    height
  } : {
    left: nodeRect.left,
    top,
    transform: `translateX(calc(-100% - ${gap}px))`,
    height
  };
};

/**
 * The insets to apply to a surface wrapper, plus whether that wrapper spans its target node.
 *
 * Two kinds of placement produce this. A measured one resolves to pixel numbers from a
 * `getBoundingClientRect` snapshot, so it is only as fresh as the last render and needs observers
 * to keep it honest. An anchored one resolves to `anchor()` functions that the browser re-evaluates
 * on every layout change, so it stays attached to its node with nothing re-rendering.
 *
 * `isSticky` is carried alongside the style rather than read back out of it because the two variants
 * express the same stretch differently — a measured `height` versus an anchored `bottom`.
 */

/**
 * Adapts a measured placement to the shape the surface components consume. Sticky-eligible node
 * types are the ones `getSurfacePlacement` gave a `height` to.
 */
export const toMeasuredSurfaceWrapperPlacement = placement => ({
  isSticky: placement.height !== undefined,
  style: {
    height: placement.height,
    left: placement.left,
    top: placement.top,
    transform: placement.transform
  }
});

/**
 * Where a surface goes when its anchor stops resolving, as the fallback argument to the block-axis
 * `anchor()` calls below.
 *
 * An anchor is invalid once its element stops generating a box e.g. (`display: none`) / removed node
 * Currently, anchor fallback is not unstable with some of the position-visibility options, so here
 * we manually set a fallback of -9999 so that it will render offscreen out of the viewport
 * without causing extra overflows
 */
const INVALID_ANCHOR_OFFSCREEN_PX = 9999;
const INVALID_ANCHOR_FALLBACK_TOP = `-${INVALID_ANCHOR_OFFSCREEN_PX}px`;
const INVALID_ANCHOR_FALLBACK_BOTTOM = `${INVALID_ANCHOR_OFFSCREEN_PX}px`;
export const getAnchoredSurfacePlacement = ({
  anchorName,
  layout,
  nodeType,
  nodeTypeWithLevel,
  parentNodeType,
  side
}) => {
  if (nodeType === 'layoutColumn') {
    // The column's horizontal midpoint, matching the measured `nodeRect.left + width / 2` and the
    // legacy drag handle's own layout-column formula. Side-independent.
    return {
      isSticky: false,
      style: {
        left: `calc((anchor(${anchorName} left) + anchor(${anchorName} right)) / 2)`,
        positionAnchor: anchorName,
        top: `anchor(${anchorName} top, ${INVALID_ANCHOR_FALLBACK_TOP})`,
        transform: 'translate(-50%, -50%)'
      }
    };
  }
  const gap = dragHandleGap(nodeType, parentNodeType);
  const isSticky = shouldBeSticky(nodeType);
  return {
    isSticky,
    style: {
      // A sticky wrapper is stretched with `bottom` instead of a measured `height`. Pairing it
      // with the adjusted `top` keeps the box ending exactly where the node does, however far
      // the top adjustment pushed the start down and however much the node later grows.
      ...(isSticky ? {
        bottom: `anchor(${anchorName} bottom, ${INVALID_ANCHOR_FALLBACK_BOTTOM})`
      } : {}),
      left: side === 'right' ? `calc(anchor(${anchorName} right) + ${gap}px)` : `anchor(${anchorName} left)`,
      positionAnchor: anchorName,
      top: `calc(anchor(${anchorName} top, ${INVALID_ANCHOR_FALLBACK_TOP}) + ${topPositionAdjustment(nodeTypeWithLevel, layout)}px)`,
      // The left side grows away from the node without knowing its own width, so it pulls itself
      // back past its own box and the gap. The right side grows into the margin, so the gap is
      // already folded into `left` above.
      transform: side === 'right' ? '' : `translateX(calc(-100% - ${gap}px))`
    }
  };
};