@atlaskit/editor-plugin-expand/dist/esm/editor-commands/deleteEmptyLineAfterCollapsedExpand.js

Expand plugin for @atlaskit/editor-core

import { Selection } from '@atlaskit/editor-prosemirror/state';
import { getExpandTitleInput } from '../utils';
/**
 * The empty paragraph holding the caret, when its previous sibling is a collapsed expand or nested
 * expand and it is not the last child of its container. The last child is kept so there is always a
 * line to type in after the expand.
 */
var getEmptyLineAfterCollapsedExpand = function getEmptyLineAfterCollapsedExpand(state, isCollapsed) {
  var $from = state.selection.$from;
  var _state$schema$nodes = state.schema.nodes,
    paragraph = _state$schema$nodes.paragraph,
    expand = _state$schema$nodes.expand,
    nestedExpand = _state$schema$nodes.nestedExpand;
  var textblock = $from.parent;
  if (textblock.type !== paragraph || textblock.content.size > 0) {
    return undefined;
  }
  var container = $from.node(-1);
  var index = $from.index(-1);
  var isLastChild = index === container.childCount - 1;
  if (index === 0 || isLastChild) {
    return undefined;
  }
  var previousSibling = container.child(index - 1);
  var isExpand = previousSibling.type === expand || previousSibling.type === nestedExpand;
  if (!isExpand || !isCollapsed(previousSibling)) {
    return undefined;
  }
  var lineStart = $from.before();
  return {
    expandContentStart: lineStart - previousSibling.nodeSize + 1,
    lineStart: lineStart,
    lineEnd: $from.after()
  };
};
/**
 * Backspace in an empty line directly after a collapsed expand: deletes the line and moves focus to
 * the end of the expand title, in one transaction. Returns false, without changing anything, when
 * the caret is anywhere else or the title input cannot be found, so other Backspace handling runs.
 */
export var deleteEmptyLineAfterCollapsedExpand = function deleteEmptyLineAfterCollapsedExpand(_ref) {
  var focusTitle = _ref.focusTitle,
    isCollapsed = _ref.isCollapsed;
  return function (state, dispatch, editorView) {
    if (!editorView || !state.selection.empty) {
      return false;
    }
    var emptyLine = getEmptyLineAfterCollapsedExpand(state, isCollapsed);
    if (!emptyLine) {
      return false;
    }
    var titleInput = getExpandTitleInput(editorView, emptyLine.expandContentStart);
    if (!titleInput) {
      return false;
    }
    if (!dispatch) {
      return true;
    }
    var tr = state.tr.delete(emptyLine.lineStart, emptyLine.lineEnd);
    var selectionInsideExpand = Selection.findFrom(tr.doc.resolve(emptyLine.expandContentStart), 1, true);
    if (selectionInsideExpand) {
      tr.setSelection(selectionInsideExpand);
    }
    dispatch(tr);
    var titleInputAfterDelete = getExpandTitleInput(editorView, emptyLine.expandContentStart);
    if (!(titleInputAfterDelete !== null && titleInputAfterDelete !== void 0 && titleInputAfterDelete.isConnected)) {
      focusTitle(emptyLine.expandContentStart)(editorView.state, dispatch, editorView);
      return true;
    }
    titleInputAfterDelete.focus();
    var titleEnd = titleInputAfterDelete.value.length;
    titleInputAfterDelete.setSelectionRange(titleEnd, titleEnd);
    return true;
  };
};