@atlaskit/editor-plugin-block-controls/dist/es2019/pm-plugins/utils/transactions.js

Block controls plugin for @atlaskit/editor-core

import { ReplaceAroundStep, ReplaceStep } from '@atlaskit/editor-prosemirror/transform';
/**
 * Checks if step adds inline char
 * @param s
 * @returns True if step adds inline char
 */
export const isStepText = s => {
  const content = s.slice.content.firstChild;
  return s.from === s.to && s.slice.content.childCount === 1 && !!content && !!content.text;
};

/**
 * Checks if step is an inline delete/backspace (replace range from -> from + 1 with empty content)
 * @param s
 * @returns True if delete/backspace
 */
export const isStepDelete = s => {
  const content = s.slice.content;
  return s.to === s.from + 1 && content.size === 0;
};

/**
 * Check if content being replaced is replaced with another of the same size
 * This can occur on empty docs and 'backspace' is pressed, the paragraph node is re-drawn
 * @param s
 * @returns True if content being replaced is replaced with another of the same size
 */
const isStepContentReplacedWithAnotherOfSameSize = s => {
  if (s instanceof ReplaceAroundStep) {
    const replacedContentSize = s.to - s.from;
    return s.slice.content.size === replacedContentSize;
  }
  return false;
};

/**
 * Get metadata from the transaction.
 * @param tr
 * @returns Min 'from', max 'to' (from + slice size, or mapped 'to', whichever is larger). If no steps, returns pos range of entire doc.
 * Number of ReplaceStep and ReplaceAroundStep steps 'numReplaceSteps'.
 * 'isAllText' if all steps are represent adding inline text or a backspace/delete or no-op
 */
export const getTrMetadata = (tr, flags) => {
  let from;
  let to;
  let numReplaceSteps = 0;
  let isAllText = true;
  let isReplacedWithSameSize = false;
  tr.steps.forEach(s => {
    if (s instanceof ReplaceStep || s instanceof ReplaceAroundStep) {
      if (s instanceof ReplaceAroundStep || s instanceof ReplaceStep && !isStepText(s) && !isStepDelete(s)) {
        isAllText = false;
      }
      // Fixes drag handle and quick insert button overlap issues
      if (flags.toolbarFlagsEnabled) {
        // platform_editor_controls note: fixes drag handle and quick insert button overlap issues
        isReplacedWithSameSize = isStepContentReplacedWithAnotherOfSameSize(s);
      }
      const mappedTo = tr.mapping.map(s.to);
      let $to = s.from + s.slice.size;
      $to = $to > mappedTo ? $to : mappedTo;
      from = from === undefined || from > s.from ? s.from : from;
      to = to === undefined || to < $to ? $to : to;
      numReplaceSteps++;
    }
  });
  if (from === undefined) {
    from = 0;
  }
  if (to === undefined || to > tr.doc.nodeSize - 2) {
    to = tr.doc.nodeSize - 2;
  }
  return {
    from,
    to,
    numReplaceSteps,
    isAllText,
    isReplacedWithSameSize
  };
};